Application of Eco-Friendly Coagulants in Waste Water Treatment

Abstract

The high cost associated with chemically treated coagulants has made access to clean water a major challenge in rural areas. Consequently, many rural populations are compelled to depend on easily accessible but low-quality water sources, thereby increasing their vulnerability to waterborne diseases. This study aims to evaluate the coagulation and adsorption efficiency of various low-cost, eco-friendly, and locally available natural coagulants-specifically Moringa oleifera seed powder, extract, and banana peel powder-as sustainable alternatives to conventional chemical coagulants such as alum or ferric chloride. Experimental investigations and literature surveys consistently highlight Moringa oleifera seeds as the most effective among natural coagulants, due to their high cationic polyelectrolyte content, which facilitates the aggregation and sedimentation of suspended particles. Preliminary results from this project confirm that Moringa oleifera demonstrates superior adsorption equilibrium and turbidity removal efficiency when compared to other natural agents under controlled conditions. This study underscores the potential of utilizing bio-coagulants in decentralized water treatment systems, especially in resourcelimited settings. The findings are expected to promote sustainable water purification practices by demonstrating that natural coagulants can achieve water quality improvements comparable to those of synthetic coagulants, while minimizing environmental and health-related side effects.

Introduction

The study focuses on natural coagulants—Moringa oleifera seed powder and banana peel powder—as sustainable alternatives to chemical coagulants like alum for wastewater treatment. Rapid urbanization and industrialization have increased water pollution and turbidity, making effective treatment essential. Chemical coagulants, while effective, pose health risks and environmental concerns, prompting the exploration of biodegradable, low-cost, and eco-friendly plant-based options.

Banana peel powder is rich in cellulose, pectin, and starch, which aid floc formation, while Moringa seed powder contains positively charged proteins that neutralize colloidal particles. Both coagulants effectively reduce turbidity in domestic wastewater, dairy effluent, and polluted pond water, often with minimal pH alteration, making them environmentally favorable. The study concludes that domestic wastewater responds best to treatment using these natural coagulants, and proper dosage adjustment based on wastewater characteristics, particularly pH, is critical for optimal performance.

Conclusion

Moringa oleifera seed powder has emerged as an effective natural coagulant for the treatment of domestic wastewater. It demonstrates a strong ability to reduce turbidity and suspended impurities while minimizing the environmental drawbacks commonly associated with conventional chemical coagulants. Its biodegradable and plant-based nature makes it especially suitable for sustainable greywater management. One of the key advantages of using moringa seed powder is its ability to maintain the treated water closer to neutral pH. Unlike many chemical coagulants, it does not significantly acidify the wastewater, thereby reducing the need for additional pH correction. This contributes to a simpler, safer, and more environmentally friendly treatment process. In contrast, alum presents a notable limitation in domestic wastewater treatment due to its acidic nature. The addition of alum often lowers the pH of the wastewater, which can lead to increased corrosivity, potential ecological stress, and the need for further chemical adjustment. This not only increases operational complexity but also affects the overall sustainability of the treatment system. Furthermore, the optimal dosage for domestic wastewater treatment whether using natural or chemical coagulants depends strongly on the inherent characteristics of the sewage present in the greywater. Parameters such as initial turbidity, pH, organic load, and suspended solids concentration must be carefully evaluated to determine the appropriate coagulant dose. Proper characterization ensures efficient treatment performance while avoiding under- or over-dosing

References

[1] Wendenson Mekonin Desta et al.,(2021);”Waste water treatement using a Natural coagulant (moringa oleifera seeds)optimization through response surface methodology.”science direct [2] Mao Megersa ,Abebe Beyene,Argaw Ambelu et al.,(2014);”The use of indigenous plant species for drinking water treatment in developing contries”.j.Bio.&Env.sci [3] Gabriele Wolf,Roselena Maria Schnelder,Milene Carvalho Bongiovani et al (2015);”Application of coagulation/flocculation process of dairy waste water from convenstional treatment Using Natural coagulants for Reuse”.AIDIC [4] Bhatt,MusthafAAboobacker,MeerambikaMishra et al.,(2022);”Application ofnatural coagulants in waste water treatment:A sustainable alternatives to chemical .MDPI [5] Tasneembano kazi,Arjun Virupakshi et al.,(2013);”Treatment of tannery wastewater using natural co-agulants:International journal of Innovative Resarch in Science,Engineering and Tech-nology,Volume II, Issue VIII.science direct. [6] Saravanan J., Priyadharshini D, Soundammal A., Sudha G,Suriyakala K et al.,(2016);“Wastewater Treatment using Natural Coagulants” SSRG - IJCE

Copyright

Copyright © 2026 Afna C, Fidha Sherin C, Mirfa Thahmin P, Mohammed Irshad N F, Assist Prof. Fathima Fayiza Elachola. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.