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DEVELOPMENT AND VALIDATION OF SUSTAINABLE ORGANIC

FILTERS: TECHNOLOGICAL INNOVATION FOR WATER TREATMENT

IN VULNERABLE COMMUNITIES

Mayane Rawell1

Abstract: Access to safe and potable water constitutes a fundamental human right and the basis for

global public health; however, billions of people, especially in vulnerable communities in developing

countries, still lack this essential resource. This article proposes the development and validation

of an innovative, low-cost organic lter model, based on plant biomaterials, with an emphasis on

applying Moringa oleifera seeds as a coagulant and adsorbent agent in decentralized purication

systems, also known as Point-of-Use (POU) systems. The research aims to integrate technological,

environmental, and social aspects, proposing a hybrid methodology that combines rigorous laboratory

analyses for optimizing and validating lter efciency with a detailed protocol for eld studies,

assessing the impact of adopting this technology in schools and low-income communities. The focus

is on improving critical water potability indicators, including turbidity, apparent color, pH, and

microbiological contamination (total coliforms and Escherichia coli), and the consequent potential

reduction in the incidence of waterborne diseases, particularly acute diarrhea that disproportionately

affects children under ve years old. The proposed methodological approach includes the detailed

physicochemical characterization of biomaterials, coagulation-occulation tests (Jar Test), multi-stage

ltration efciency tests, and a Life Cycle Assessment (LCA) to holistically evaluate the environmental

sustainability of the solution. It is expected to demonstrate, based on robust existing scientic literature

and consolidated empirical evidence, that the use of biomaterials in sanitary engineering, exemplied

by Moringa oleifera, constitutes a viable, scalable, low-environmental-impact, and socially impactful

alternative for achieving Sustainable Development Goal 6 (SDG-6), promoting equitable access to

1 Bachelor of Science in Chemical Engineering graduate of Brazil University.

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potable water and basic sanitation in contexts of socioeconomic vulnerability and strengthening

community resilience against the challenges posed by climate change and the degradation of water

resources.

Keywords: Moringa oleifera, Water Treatment, Organic Filter, Natural Coagulant, Biomaterials,

Vulnerable Communities, SDG-6, Environmental Health, Life Cycle Analysis, Decentralized Systems.

Introduction

Contextualization of the Global Water Crisis

Water is the driving force of all nature, as stated by Leonardo da Vinci, and an irreplaceable

pillar for social, economic, and environmental development. However, the global water crisis,

exacerbated by climate change, exponential population growth, unplanned urbanization, and

increasing pollution of water bodies, represents one of the largest and most complex challenges of

the 21st century. The United Nations (UN) estimates that more than 2 billion people worldwide lack

access to safely managed drinking water services, and approximately 4.2 billion people lack safe

sanitation services (NAÇÕES UNIDAS, [s.d.]). This scarcity is dramatically more pronounced in

rural, peripheral, and low-income communities in developing countries, where the chronic lack of

basic sanitation infrastructure and the consumption of contaminated water perpetuate a vicious cycle

of poverty, disease, and underdevelopment.

The consequences for public health are devastating and well-documented. Waterborne

diseases (WBDs), such as cholera, typhoid fever, bacillary dysentery, hepatitis A, giardiasis, and acute

diarrheas of various etiologies, are responsible for millions of deaths annually, with a disproportionate

and tragic impact on children under ve years old, who represent the most vulnerable population.

The World Health Organization (WHO) reports that diarrhea alone causes about 1.9 million infant

deaths per year worldwide, making it one of the leading causes of mortality in this age group and

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an eloquent indicator of inequality in access to basic resources (ORGANIZAÇÃO MUNDIAL DA

SAÚDE, 2023). This tragic scenario highlights a systemic and ethical failure in fullling a basic

human right and constitutes a signicant obstacle to the sustainable progress of developing nations.

Sustainable Development Goal 6 (SDG-6)

In response to this multifaceted crisis, the international community, through the United

Nations 2030 Agenda, established Sustainable Development Goal 6 (SDG-6): “Ensure availability

and sustainable management of water and sanitation for all” by 2030 (NAÇÕES UNIDAS, [s.d.]).

This ambitious goal is not limited merely to physical access to water but encompasses dimensions of

quality, safety, economic accessibility paradigm, moving away from exclusively centralized solutions,

which have high capital and operating costs, and which often fail to effectively and efciently serve

dispersed, remote, and marginalized populations.

In this context, decentralized, or point-of-use (POU) water treatment technologies emerge

as a strategic, complementary, and, in many cases, primary alternative. These technologies offer

operational exibility, low implementation and maintenance costs, adaptability to diverse local

contexts, and, crucially, the possibility of community empowerment, technology transfer, and

autonomy in water resource management (POOI; NG, 2018). POU systems treat water directly at the

point of nal consumption, whether in households, schools, health centers, or small communities,

eliminating or drastically reducing the risk of recontamination during transport and storage, an

endemic problem in many regions.

Biomaterials andMoringa oleiferaas a Sustainable Solution

Within the spectrum of POU solutions, the use of local, renewable, and sustainable

biomaterials for water purication has gained scientic notoriety and increasing practical recognition

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in recent decades. Among these materials,Moringa oleifera, a fast-growing tree native to subtropical

and tropical regions of Asia (mainly India) and widely cultivated in Africa, Latin America, and the

Caribbean, stands out for its remarkable and multifunctional properties. Its seeds contain natural

proteins with potent coagulant action, capable of agglutinating suspended particles, pathogenic

microorganisms, and other pollutants, facilitating their subsequent removal through sedimentation

or ltration processes (DESTA; BOTE, 2021; NDABIGENGESERE; NARASIAH; TALBOT, 1995).

The use ofMoringa oleiferanot only represents an ecological, low-cost, and socially appropriate

alternative to conventional chemical coagulants, such as aluminum sulfate (alum) and ferric chloride

(which can be associated with human health problems and generate sludge that is difcult and costly to

dispose of), but also aligns perfectly with a circular economy and sustainable development approach. It

leverages a multifunctional plant resource (the leaves, pods, and roots of Moringa also have nutritional

and medicinal uses) that is widely available in many of the regions most affected by drinking water

scarcity, transforming a local challenge into an opportunity for innovation and development.

Objectives and Structure of the Article

This article proposes the development and rigorous validation of a sustainable organic lter

that integratesMoringa oleifera seeds as the main active component in a multilayer ltration system.

The central objective is to present a robust, replicable, and scalable technological model, whose

effectiveness laboratory scale up to a comprehensive protocol for eld validation, including social and

environmental impact assessment. The research delves into the central hypothesis that a multilayer

ltration system, utilizing low-cost local materials (sand, gravel, activated carbon from coconut shells)

and Moringa oleifera as a coagulant, can consistently reduce water contamination indicators to levels

safe for human consumption, as established by the WHO and national legislation, with high social

acceptance, economic viability, and low environmental impact throughout its entire life cycle.

By connecting technological innovation in sanitary engineering with the pressing need for

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environmental health in vulnerable communities, and by adopting a holistic approach that integrates

technical, social, economic, and environmental aspects, this work seeks to offer a signicant theoretical

and practical contribution to the advancement of SDG-6. It demonstrates a scalable, sustainable, and

culturally appropriate path to bring safe water to those who need it most, contributing to the reduction

of diseases, improvement of quality of life, and strengthening of community resilience.

Literature Review

The Water Crisis and the Need for Decentralized Solutions

Pressures on Water Resources

Accelerated urbanization, intensive industrialization, and unsustainable agricultural practices

have pressured global water resources to an unprecedented level in human history. The contamination

of rivers, lakes, aquifers, and water tables by untreated domestic efuents, toxic industrial discharges,

and agricultural runoff loaded with pesticides and fertilizers severely compromises the quality of

available water, making it unt for human consumption without adequate prior treatment. In many

regions of the world, particularly Sub-Saharan Africa, South Asia, and parts of Latin America, water

treatment and distribution infrastructure is inadequate, obsolete, or simply nonexistent (POOI; NG,

2018).

Centralized water treatment and distribution systems, although highly effective in dense

urban areas with adequate nancial and technical resources, require high initial capital investment,

elevated continuous operational costs (energy, chemicals, specialized labor), and complex and

sophisticated technical management. These characteristics make them economically unviable and

technically impractical for rural, remote, dispersed, or low-income communities, which are precisely

those most in need of basic sanitation interventions (POOI; NG, 2018).

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Waterborne Diseases and Impact on Public

Health This critical infrastructure gap creates a chronic dependence on unimproved or

unprotected water sources, such as open wells, unprotected springs, rivers, and lakes, which are

often contaminated with a wide range of pathogens, including bacteria (E. coli, Salmonella, Vibrio

cholerae), viruses (rotavirus, norovirus, hepatitis A), and protozoa (Giardia lamblia, Cryptosporidium).

The direct and inevitable consequence is the high prevalence of waterborne diseases (WBDs) in

these populations. The WHO points out that the ingestion of contaminated water is one of the main

vectors for the transmission of diseases such as cholera, typhoid fever, giardiasis, cryptosporidiosis,

hepatitis A, and, above all, acute diarrheas of various etiologies (ORGANIZAÇÃO MUNDIAL DA

SAÚDE, 2023). The impact is particularly severe in children under ve years old, the elderly, and

immunocompromised individuals, who constitute the population most vulnerable to severe infections

and complications (SHAYO et al., 2023).

In addition to direct mortality, WBDs generate a substantial burden of morbidity, chronic

malnutrition (due to recurrent episodes of diarrhea), impaired cognitive development in children,

school and work absenteeism, and signicant economic costs for families and already overburdened

health systems. It is estimated that improving access to safe drinking water and sanitation could

prevent at least 9.1

Moringa oleifera: A Promising Biocoagulant

Botanical Characteristics and Geographical Distribution

Moringa oleifera Lam. (Moringaceae family), popularly known as the “tree of life,” “miracle

tree,” or “drumstick tree,” is a fast-growing, drought-resistant, multi-purpose tree, native to the

Himalayan mountains in northwestern India. Currently, it is cultivated in tropical and subtropical

regions worldwide, including Africa, Asia, Latin America, and the Caribbean, due to its adaptability

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to adverse climatic conditions and poor soils. Practically all parts of the plant (leaves, pods, seeds,

owers, roots, bark) have traditional uses in food, medicine, and agriculture, making it a species of great

socioeconomic and nutritional value for rural communities (NDABIGENGESERE; NARASIAH;

TALBOT, 1995).

Coagulation Mechanism

The search for effective, low-cost, environmentally benign, and socially appropriate

coagulants has led, in recent decades, to in-depth scientic investigation of plant-based materials.

Among these, Moringa oleifera has emerged as one of the most promising and well-studied alternatives

to conventional metallic salts, such as aluminum sulfate (alum) and ferric chloride. Moringa oleifera

seeds contain a water-soluble cationic protein that acts as a potent natural coagulating agent

(NDABIGENGESERE; NARASIAH; TALBOT, 1995).

The coagulation mechanism of Moringa oleifera was elucidated in seminal and widely cited

studies, such as that by Ndabigengesere et al. (1995). The authors demonstrated, through electrophoresis

and chromatography techniques, that the active agents are dimeric proteins with a molecular weight of

around 13 kDa and a high isoelectric point, between 10 and 11, which gives them a

Efciency in the Removal of Turbidity and Microorganisms

The efciency of Moringa oleifera in removing turbidity and pathogenic microorganisms is

comparable, and in some cases superior, to that of aluminum sulfate, depending on the characteristics of

the raw water (pH, alkalinity, type, and concentration of particles). Experimental studies demonstrate

turbidity removals above 90-99% in waters with different levels of initial contamination, ranging from

50 to 500 NTU (Nephelometric Turbidity Units) (DESTA; BOTE, 2021; PATERNIANI et al., 2009). In

addition to its primary coagulant function, Moringa oleifera seed extracts exhibit direct antimicrobial

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activity, contributing to water disinfection. In vitro studies have demonstrated bactericidal and

bacteriostatic activity against a variety of pathogenic bacteria, including E. coli, Salmonella spp., and

Staphylococcus aureus (NZEYIMANA et al., 2024). This dual function (coagulant and antimicrobial)

makes it particularly attractive for simplied and multi-barrier treatment systems.

Comparative Advantages over Chemical Coagulants

The advantages of using Moringa oleifera over conventional chemical coagulants are multiple,

signicant, and encompass environmental, economic, social, and public health dimensions. From the

perspective of origin and sustainability, while aluminum sulfate is a mineral and synthetic product,

dependent on energy-intensive industrial processes (bauxite mining, rening, chemical production)

and globalized supply chains, Moringa oleifera seeds are of plant origin, renewable, and can be

cultivated locally in tropical and subtropical regions, precisely where the need for water treatment

solutions is most pressing. This drastically reduces the carbon footprint associated with transport and

industrial production (DESTA; BOTE, 2021; NDABIGENGESERE; NARASIAH; TALBOT, 1995).

In terms of toxicity and human health, residual aluminum present in water treated with

aluminum sulfate has been a subject of scientic and public health concern. Epidemiological and

toxicological studies suggest a possible association between chronic aluminum exposure and risks

of neurotoxicity, as well as sodium carbonate), which increases operational complexity and costs.

Furthermore, alum consumes the natural alkalinity of the water, which can be problematic in waters

with low alkalinity. In contrast, Moringa oleifera has a minimal effect on pH and a negligible impact

on alkalinity, considerably simplifying the treatment process and making it more robust and less

dependent on chemical adjustments (DESTA; BOTE, 2021; NDABIGENGESERE; NARASIAH;

TALBOT, 1995).

The issue of generated sludge is particularly relevant from an environmental and operational

perspective. Aluminum sulfate produces a considerable volume of chemical sludge, rich in aluminum

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hydroxide, which is difcult to dewater, costly to dispose of, and potentially hazardous to the

environment if not managed properly. In many developing countries, the inadequate management of

this sludge represents a signicant environmental problem. In contrast, Moringa oleifera generates

a signicantly smaller volume of sludge, estimated at about four to ve times less, and is organic in

nature, thus biodegradable, easier to handle, and has the potential for use as fertilizer or soil conditioner

(DESTA; BOTE, 2021; NDABIGENGESERE; NARASIAH; TALBOT, 1995).

From an economic standpoint, the cost of aluminum sulfate is high

The upper layer, composed of materials with larger particle size (coarse gravel), acts as pre-

ltration, removing larger debris, leaves, and coarse particles, and distributing the water ow more

uniformly over the lower layers. The intermediate layers, made of coarse sand and ne sand, are

responsible for removing most suspended particles, ocs, protozoan cysts (Giardia, Cryptosporidium),

and a signicant portion of bacteria. The ne sand layer, in particular, is crucial for ltration efciency

because, in addition to physical removal, an active biological layer (biolm or “schmutzdecke”)

develops on its surface, composed of benecial microorganisms that contribute to the degradation of

organic matter and the removal of pathogens (MINTZ et al., 2001).

Adsorption and Adsorbent Biomaterials

The innovation lies in the incorporation of other biomaterials with specic adsorbent

properties to remove dissolved contaminants that are not effectively eliminated solely by coagulation

and physical ltration. Adsorption is a surface process where ions, molecules, or atoms of a substance

(adsorbate) adhere to the surface of a porous material (adsorbent) through physical forces (physical

adsorption or physisorption, such as Van der Waals forces) or chemical bonds (chemical adsorption

or chemisorption). Biomaterials such as activated carbon from coconut shells, carbonized sugarcane

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bagasse, modied sawdust, rice husks, and natural or modied clays have demonstrated a high capacity

to adsorb heavy metals (lead, cadmium, mercury, arsenic), pesticides, dissolved organic compounds,

dyes, and odors (KUMAR et al., 2024; YADAV et al., 2021).

Granular activated carbon (GAC), produced from coconut shells, is particularly effective due

to its high specic surface area (typically 8)

Importance of Community Participation and Social Acceptance

The successful and sustainable implementation of any water treatment technology in

vulnerable communities depends not only on its technical efcacy proven in the laboratory, but

also, and crucially, on its social acceptance, long-term economic viability, ease of operation and

maintenance using local resources, and environmental sustainability throughout its entire life cycle.

Case studies on the implementation of lters and other POU technologies in schools, homes, and

small communities in various countries consistently highlight the fundamental importance of a

participatory approach, which actively involves the community from the initial phases of design and

planning, through construction and installation, to the operation, maintenance, and monitoring of the

systems (FREEMAN; CLASEN, 2011; NELSON et al., 2021).

Community participation is not merely a matter of courtesy or “consultation,” but an

essential element for ensuring technology ownership, the building of local capacity, the adaptation of

the design to the specic needs and conditions of the community, and long-term sustainability. When

communities are merely passive recipients of externally imposed technologies, without understanding

how they work or without a sense of ownership, abandonment and failure rates are dramatically high

(NELSON et al., 2021).

Schools, in particular, function as strategic centers for the dissemination of knowledge,

hygiene practices, and healthy behaviors, where children can act as agents of change in their families

and communities, taking home the lessons learned about the importance of safe water, hand hygiene,

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and sanitation (SOUZA et al., 2021). Interventions in schools have been shown not only to improve

health and reduce student absenteeism but also to have a multiplier effect on household practices

(FREEMAN; CLASEN, 2011).

Life Cycle Assessment (LCA) and Environmental Sustainability

To holistically and rigorously assess the sustainability of water treatment interventions,

Life Cycle Assessment (LCA) is a powerful and widely recognized methodological tool. LCA

is a standardized technique (ISO 14040 and ISO 14044) that allows for the quantication of the

environmental impacts of a product, process, or service from raw material extraction, through

production, transport, use, to nal disposal or recycling, in an approach known as “cradle-to-grave”

(RASHID et al., 2023).

The application of LCA to decentralized water treatment systems based on biomaterials,

such as the lter proposed in this study, tends to reveal a signicantly smaller environmental footprint

compared to centralized systems that use energy- and resource-intensive chemicals. The local

production of Moringa oleifera,

Sand, gravel, and coconut shell activated carbon, for example, drastically reduce the impacts

associated with long-distance transport and the industrial production of chemical coagulants, which

involve mining, high-temperature chemical processes, and energy consumption (GARRIDO-

BASERBA et al., 2024; RASHID et al., 2023).

Recent Life Cycle Assessment (LCA) studies applied to decentralized water treatment

systems demonstrate that these systems can have superior environmental performance in impact

categories such

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Proposed Methodology

To meet the central objective of rigorously and comprehensively developing and validating a

sustainable organic lter, a multiphase and integrated research methodology is proposed, combining

experimental laboratory approaches with protocols for eld studies and social and environmental

impact assessment. This methodology was designed to be replicable, robust, and scientically sound,

allowing not only for the assessment of the lter’s technical efcacy under controlled conditions but

also its viability, acceptance, and sustainability in real-world usage contexts.

Filter Prototype Development and Construction

Multilayer Filtration System Design

The lter design will be based on a downward-ow multilayer ltration system, utilizing

low-cost materials that are locally available and easily acquired in many vulnerable communities. The

prototype will be constructed using food-grade cylindrical containers (e.g., High-Density Polyethylene

- HDPE - plastic buckets with a 20-liter capacity), which are widely available, durable, lightweight,

and low-cost. The system will follow a gravitational ow model, requiring no electrical energy or

pumping, which is a crucial advantage for contexts of energy scarcity.

The internal structure of the lter will be composed of the following layers, arranged from

top to bottom:

Layer 1 - Coarse Pre-ltration (Coarse Gravel): The top layer will consist of coarse gravel,

with an approximate particle size of 1 to 2 cm and a thickness of about 5 to 7 cm. This layer functions

to remove larger debris (leaves, twigs, insects), protect the lower layers from premature clogging, and

distribute the water ow more uniformly over the lter surface.

Layer 2 - Fine Pre-ltration (Fine Gravel): Below the rst layer, a layer of ne gravel, with an

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approximate particle size of 0.5 to 1 cm and a thickness of 5 to 7 cm, will continue the pre-ltration

process, removing intermediate-sized particles.

Layer 3 - Primary Filtration (Coarse Sand): A layer of coarse sand, with an approximate

particle size of 0.5 to 1 mm and a thickness of 10 to 15 cm, will act to remove suspended particles,

protozoa (Giardia, Cryptosporidium), a signicant portion of bacteria, and the development of an

active biolm that contributes to biological purication.

Layer 4 - Adsorption (Granular Activated Carbon - GAC): This layer will be composed of

granular activated carbon (GAC) produced from coconut shells, with an approximate particle size

(granulometry) of 1 to 3 mm and a thickness of 10 to 15 cm. GAC is chosen for its high surface area,

capacity to adsorb dissolved organic compounds, residual chlorine (if applicable), some heavy metals,

pesticides, and substances that impart unpleasant taste and odor to the water, signicantly improving

the efuent’s organoleptic characteristics.

Layer 5 - Support and Drainage (Fine and Coarse Gravel): A nal layer of ne gravel (5

cm) followed by coarse gravel (5 cm) at the base of the lter will prevent clogging of the water

outlet, provide structural support to the upper layers, and facilitate the uniform drainage of the treated

efuent.

Between each layer of ltering material, ne nylon screens (mesh size of approximately 1

mm) will be used to prevent the mixing of materials with different particle sizes and maintain the

structural integrity of the lter bed. The treated water outlet will be positioned at the base of the

container, equipped with a tap or valve for ow control.

Preparation and Pre-treatment of Filtering Materials

All ltering materials (gravel, sand, activated carbon) will undergo a rigorous preparation and

pre-treatment process before the lter assembly, to ensure their cleanliness, particle size uniformity,

and ltering efciency. Gravel and Sand: They will be thoroughly washed with running water to

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remove dust, the coagulant solution will be prepared from high-quality, mature Moringa oleifera

seeds, preferably collected from healthy trees grown without the use of pesticides.

• Hulling/Shelling: The seeds will be manually hulled/shelled to obtain the internal kernels,

which contain the highest concentration of coagulant proteins. The outer shell, although

it also contains some proteins, is less effective and may introduce impurities.

• Drying: The hulled kernels will be dried in an oven at a mild and controlled temperature

(approximately 50 °C) for a period of 24 to 48 hours, or until they reach a moisture

content below 10%. Drying is important to facilitate grinding, increase the shelf life of

the material, and standardize the protein concentration. Very high temperatures must be

avoided so as not to denature the active proteins.

• Grinding: Next, the dried kernels will be crushed in a mill (hammer mill, ball mill, or

industrial blender) until a ne and homogeneous powder is obtained, with a particle size

smaller than 0.5 mm. The powder will be stored in airtight containers, protected from

light and moisture, until the time of use.

Extraction of the Coagulant Protein

The Moringa seed powder will be mixed with a saline solution to extract the active cationic

proteins. Studies show that extraction with a saline solution (e.g., 1M NaCl) is more efcient than

extraction with distilled water alone, as it increases the solubility and stability of the proteins

(NDABIGENGESERE; NARASIAH; TALBOT, 1995).

• Ratio: The typical ratio is 1 g of seed powder to 100 mL of saline solution (1M NaCl), but

this ratio can be adjusted based on preliminary tests and the characteristics of the water

to be treated. about contaminant removal.

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Preparation of Synthetic Water

Synthetic waters with different levels of turbidity and microbiological contamination will be

prepared to simulate surface waters (rivers, lakes, shallow wells) found in rural communities and to

evaluate the robustness of the treatment system.

• Turbidity: Turbidity will be induced by adding standard clay (bentonite or kaolinite)

in varied concentrations to obtain turbidity levels of 50, 100, 200, and 300 NTU

(Nephelometric Turbidity Units), covering a representative range of surface waters.

• Organic Matter: Natural organic matter (humus, leaf extract) will be added to simulate

the presence of humic and fulvic substances, which are common in surface waters and

can interfere with coagulation and disinfection.

• Microbiological Contamination: The synthetic water will be inoculated with a non-

pathogenic strain ofEscherichia coli(e.g., ATCC 25922) at known concentrations (e.g.,

10³ to 105 CFU/100 mL) to evaluate the system’s bacterial removal efciency. The use

of a non-pathogenic strain ensures the safety of the researchers and avoids the need for

high-level biosafety facilities.

Coagulation Tests (Jar Test)

Bench-scale coagulation tests (Jar Test) will be performed to determine the optimal dosage of

theMoringa oleiferasolution for each turbidity level of the synthetic water. The Jar Test is a standardized

procedure widely used in sanitary engineering to optimize coagulation-occulation processes.

Procedure: Six 1-liter beakers, containing samples of the synthetic water, will be placed in a Jar Test

apparatus. Different concentrations of theMoringa coagulant solution (e.g., 0

Using the optimal coagulant dosage dened in the Jar Test, the synthetic water will be pre-

treated with the Moringa coagulant, and after an adequate sedimentation time (30-60 minutes), the

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supernatant will be passed through the prototype of the multilayer lter.

Samples will be collected before treatment (raw water), after coagulation-sedimentation

(settled water), and after ltration (ltered water) for analysis of the following parameters, following

the standardized methods described in the Standard Methods for the Examination of Water and

Wastewater (APHA; AWWA; WEF, 2017):

Physicochemical Parameters:

• Turbidity: Measured in a turbidimeter (nephelometric method), expressed in NTU.

• Apparent Color: Measured in a spectrophotometer (spectrophotometric method),

expressed in Hazen units (uH) or Pt-Co.

• pH: Measured in a pH meter (potentiometric method).

• Electrical Conductivity: Measured in a conductivity meter, expressed in µS/cm.

• Total Dissolved Solids (TDS): Calculated from conductivity or measured gravimetrically.

Microbiological Parameters:

• Total Coliform and E. coli Count: Using the membrane lter method (ltration on a 0.45

µm membrane, incubation in specic culture medium, colony counting) or the Colilert®

method (dened enzymatic substrate, colorimetric/uorimetric reading), expressed in

CFU/100 mL or MPN/100 mL (Most Probable Number).

Specic Chemical Contaminants (optional, depending on the water source):

• Heavy Metals: Analysis of lead (Pb), cadmium (Cd), arsenic (As), mercury (Hg) by

atomic absorption spectrometry (AAS) or inductively coupled plasma optical emission

spectrometry (ICP-OES), expressed in mg/L or µg/L.

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• Nitrates and Nitrites: Analysis by colorimetric methods or ion chromatography, expressed

in mg/L. The results will be compared with the WHO drinking water standards

(ORGANIZAÇÃO MUNDIAL DA SAÚDE, 2023) and Ordinance GM/MS Nº 888/2021

of the Brazilian Ministry of Health (BRASIL, 2021) to evaluate the compliance of the

treated water.

Protocol for Field Study and Social Impact Assessment

Following successful laboratory validation, a detailed protocol is proposed for the

implementation and evaluation of the lter in a real-world context, aiming to assess its feasibility,

acceptance, effective use, and impact on the health and quality of life of a target community.

Community Selection and Baseline Study Community selection will be based on criteria

of water vulnerability (lack of access to potable water, dependence on unimproved sources), the

presence of a partner community organization (residents’ association, school, health post) willing to

collaborate, and logistical feasibility for access and monitoring.

A baseline study will be conducted before the implementation of the lters to collect

quantitative and qualitative data on:

• Water Sources and Treatment Practices: Household survey to identify the water sources

used (well, river, lake, cistern), current treatment practices (boiling, chlorination,

ltration, none), and water storage.

• Perception of Water Quality: Semi-structured interviews and focus groups to assess

the community’s perception of water quality (taste, odor, appearance, safety) and the

willingness to adopt new treatment technologies.

• Incidence of Diarrheal Diseases: Collection of retrospective data on the incidence of

diarrheal diseases over the last 6 to 12 months, based on records from local health posts

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and household surveys (2-week recall).

• Water Quality Analysis of Local Sources: Collection and analysis of water samples from

the main sources used by the community (wells, rivers, cisterns) for the same physical-

chemical and microbiological parameters described in section 3.3.3, establishing the

baseline water quality before the intervention.

Participatory Implementation and Community Training

The construction and installation of the lters will be carried out in participatory workshops

with community members, local school students, and teachers. The training will cover the following

in a practical and didactic manner:

• Filter Operating Principles: Simplied explanation of how Moringa coagulation and

multi-layer ltration work, using visual materials and practical demonstrations.

• Filter Construction: Active participation in assembling the lters, from material

preparation to layer arrangement and tap installation.

Preparation of the Moringa Coagulant: Practical training on

• Maintenance and Cleaning: Training on periodic lter cleaning (removal of the top layer

of sand when there is a signicant reduction in ow rate), replacement of activated carbon

layers (every 6-12 months, depending on the volume treated), and general care.

• Hygiene and Safe Storage: Reinforcement of hand hygiene practices, cleaning of water

storage containers, and prevention of recontamination.

Illustrated educational materials (booklets, posters) will be developed and distributed in

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accessible and culturally appropriate language.

Monitoring and Impact Assessment

Over a period of 6 to 12 months, continuous and systematic monitoring will be carried out to

evaluate the effective use, efcacy, and impact of the lters:

• Water Quality: Monthly collection of treated water samples from lters in households and the

school for analysis of the same baseline physicochemical and microbiological parameters.

Comparison with untreated water samples (control) and with potability standards.

Health: Monitoring the incidence of diarrheal diseases through records from local health

posts and biweekly or monthly household surveys, comparing with baseline data and, if

possible, with a control community (without intervention).

• Use and Acceptance: Periodic semi-structured interviews and focus groups to evaluate

users’ perception of the lter (ease of use, water taste, appearance, condence in safety),

frequency of use, challenges encountered (difculty obtaining Moringa seeds, preparation

time, maintenance), and suggestions for improvements.

• Sustainability: Assessment of the community’s capacity to maintain the lters functioning

long-term, including the local availability of replacement materials (Moringa seeds,

activated carbon) and community organization for collective management.

Environmental Sustainability Analysis (LCA)

A simplied, but rigorous, Life Cycle Assessment (LCA) will be conducted to

compare the environmental impact of the Moringa lter with two alternatives commonly

used in low-income communities: (a) conventional treatment with aluminum sulfate (in

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small-scale systems) and (b) consumption of boiled water. The analysis will follow the

guidelines of ISO 14040 and ISO 14044 standards, focusing on the following life cycle phases:

Extraction and Processing of Raw Materials:

• Moringa Filter: Cultivation and harvesting of Moringa (use of land, water, fertilizers, if

applicable), extraction of sand and gravel (small-scale mining, local transport), production

of coconut shell activated carbon (coconut shell collection, carbonization, activation).

• Alum Treatment: Bauxite mining, rening for alumina production, production of

aluminum sulfate (energy-intensive chemical processes).

• Boiling: Consumption of liqueed petroleum gas (LPG), natural gas, rewood, or

electricity (depending on the local energy source).

• Transport: Transportation of materials from the production/extraction site to the

community (distances, mode of transport).

• Use: Filter operation (does not consume energy), operation of the alum treatment system

(energy consumption for mixing, if applicable), boiling (continuous energy consumption).

End-of-Life: Disposal of lter materials (sand, gravel, activated carbon – all biodegradable

or inert), disposal of aluminum sludge (potentially hazardous), combustion gas emissions

(boiling).

The impact assessment will focus on categories relevant to the context of developing countries:

Global Warming Potential (GWP): Emissions of greenhouse gases (CO2 , CH

4 , N2O),

expressed in kg CO2 equivalent.

• Eutrophication: Emissions of nutrients (nitrates, phosphates) into water bodies.

• Human Toxicity: Exposure to toxic substances (residual aluminum, combustion

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emissions).

• Non-Renewable Resource Use: Consumption of fossil fuels, minerals.

The LCA is expected to demonstrate the environmental superiority of the proposed solution,

reinforcing its alignment with the principles of sustainable engineering and the circular economy

(GARRIDO-BASERBA et al., 2024; RASHID et al., 2023).

Expected Results and Discussion

Based on the proposed methodology and the vast existing scientic literature on the efcacy

ofMoringa oleiferaand multi-layer ltration systems, the expected results of this study are the

following:

High Contaminant Removal Efciency

The synergistic combination of coagulation-occulation using Moringa oleifera and

multilayer ltration is expected to achieve a turbidity removal efciency greater than 95%, reducing

initial turbidity from 50-300 NTU to values below 5 NTU, and ideally below 1 NTU, meeting WHO

standards and Ministerial Ordinance GM/MS No. 888/2021 (BRASIL, 2021; PATERNIANI et al.,

2009). Apparent color removal should also be signicant, exceeding 80-90%, thereby improving the

aesthetic characteristics of the water.

Regarding microbiological removal, a 2 to 3 log reduction (99% to 99.9%) of E. coli is expected,

meaning a reduction from initial concentrations of 10³-105 CFU/100 mL to values below 10¹ CFU/100

mL, bringing the treated water within potability standards for human consumption (CLASEN et

al., 2015; PATERNIANI et al., 2009). The combination of the coagulant and antimicrobial action

of Moringa with physical and biological ltration (biolm in the ne sand layer) is the mechanism

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responsible for this high efciency.

Positive Impact on Community Health

The provision of safe and quality water for human consumption should lead to a statistically

signicant reduction in the incidence of diarrheal diseases in the target community, compared to

the baseline (pre-intervention period) and, ideally, compared to a control group (similar community

without intervention). Intervention studies involving water community demonstrates the capacity

to keep the lters operational using local resources (cultivation or acquisition of Moringa seeds,

replacement of activated carbon).

Proven Environmental Sustainability

The Life Cycle Assessment (LCA) must quantify and unequivocally demonstrate the

environmental advantages of the proposed organic lter. The Moringa lter is expected to show a

signicantly lower carbon footprint (Global Warming Potential) compared to treatment with aluminum

sulfate and, especially, compared to boiling water.

Boiling, although effective for disinfection, consumes large amounts of energy (rewood,

LPG, electricity), resulting in substantial emissions of CO2 and other greenhouse gases. In regions where

rewood is the main energy source for boiling, this contributes to deforestation and environmental

degradation. Since the Moringa lter does not consume energy during operation and uses materials

with low environmental impact, it should have a much lower carbon footprint.

The comparison with alum treatment should highlight the elimination of hazardous chemical

sludge generation and the reduction of impacts associated with bauxite mining and the industrial

production of aluminum sulfate. The use of biodegradable and renewable biomaterials reinforces the

sustainability of the solution.

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Scalable and Replicable Model

The proposed lter methodology and design constitute a model that can be easily adapted

and replicated in different geographical, cultural, and socioeconomic contexts, with adjustments to

locally available materials (for example, replacing coconut shell charcoal with bamboo charcoal or

other local biomass). The simplicity of the system, the use of low-cost and locally available materials,

and the ease of technology transfer and local capacity building promote community autonomy in

managing their own water resources and facilitate the scalability of the solution.

This integrated approach, which connects rigorous laboratory validation with real-world

impact assessment, and which holistically considers technical, social, economic, and environmental

aspects, is crucial for the success and sustainability of environmental health interventions. Many

water treatment technologies fail not due to intrinsic technical deciencies, but because they do not

adequately consider the social, cultural, economic, and environmental factors that govern their long-

term adoption, use, and maintenance. By placing community participation, sustainability, and equity

at the center of the project, this study not only validates a lter but proposes a model of environmental

health intervention that can contribute signicantly to the achievement of SDG-6.

Conclusion

This article has outlined a comprehensive, rigorous, and scientically sound framework for the

development and validation of an organic and sustainable water lter, centered on the use ofMoringa

oleifera as a natural and effective bio-coagulant. The proposed research represents a critical and

innovative fusion of sanitary engineering, environmental health, social sciences, and sustainability,

addressing one of the most persistent, complex, and urgent challenges of our time: universal access to

safe drinking water, especially for the planet’s most vulnerable and marginalized populations.

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The detailed methodology presented, which ranges from rigorous laboratory optimization,

through a comprehensive protocol for participatory community implementation, to a life cycle analysis

for assessing environmental sustainability, establishes a clear, replicable, and robust roadmap for

creating a solution that is not only technically effective and scientically validated, but also socially

appropriate, culturally sensitive, economically viable, and environmentally responsible.

The strength and differentiation of the proposed approach lie in its strategic reliance on

local, renewable, and low-cost resources, which intrinsically increases the likelihood of community

ownership, management autonomy, and long-term sustainability. By replacing conventional chemical

coagulants—which are expensive, dependent on globalized supply chains, and potentially hazardous—

with a multifunctional, renewable biomaterial widely available in tropical and subtropical regions, the

proposed technology minimizes negative environmental impacts, promotes a circular economy at the

local level, and generates opportunities for socioeconomic development for rural communities.

Field validation, with an explicit focus on active community participation, health and

hygiene education, and local capacity building, ensures that the intervention is culturally sensitive,

socially accepted, and that its benets—notably the signicant reduction of waterborne diseases, the

improvement of quality of life, and the strengthening of community resilience—are maximized, long-

lasting, and equitably distributed.

In summary, the organic lter model utilizing Moringa oleifera transcends mere technical

water purication. It presents itself as a powerful and multifaceted tool for sustainable development,

capable of generating cascading positive impacts on public health, education, gender equity (by

reducing the time women and girls spend collecting water), economic resilience, and environmental

sustainability of vulnerable populations. The research, implementation, and dissemination of such

social technologies are concrete, essential, and urgent steps to transform the ideal of Sustainable

Development Goal 6 into a tangible and measurable reality for all, ensuring that water is, in fact, a

source of life, health, and well-being, and not of disease, inequality, and suffering.

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