Assessing the Performance of Bio-Coagulant and Traditional Alum Coagulants in Surface Water Treatment Process

Document Type

Conference Proceeding

Publication Date



This study focused on the evaluation of plant-based natural coagulant sources, processes, effectiveness and relevant coagulating mechanisms for the treatment of surface water. This study selected Sajna (M. oleifera) and Neem (A. indica) seeds as bio coagulants. The optimum dose for the Sajna and Neem seeds coagulant was found as 32 mg/l and 40 mg/l respectively, for the selected river water. It is found that the turbidity removal efficiencies of the coagulants are varied from 94.5 to 96.5 % with compared to alum coagulation. Turbidity removal efficiency of Sajna seeds is found approximately 1.7% higher than Neem seeds. The color removal efficiencies of the coagulants are varied from 83.6 to 87.1% with compared to alum coagulation. Color removal efficiency of Neem seeds coagulant is found approximately 3.5% higher than Sajna seeds. However, it is also observed from the linear correlation that the turbidity and color removal efficiency decrease with the initial values of raw water samples. The main advantages of using natural plant-based coagulants are apparent; cost-effective, abundant source, environment friendly, multifunction and unlikely to produce treated water with extreme pH and highly bio-degradable. The use of bio-coagulant would be a possible alternative to chemical coagulants for the treatment of surface water in rural areas and developing countries like Bangladesh.


Graduate student publication.

Publication Title

Proceedings of International Conference on Planning, Architecture and Civil Engineering