ABSTRACT

Water is one of the most important commodities which Man has exploited than any other resource for sustenance of his life. River Pamba is the lifeline of Central Travancore. The variations in the ecological balance of river Pamba adversely affect the living organisms as well as the human beings who depend upon this river. Chlorine has been most widely used disinfectant for the purification of water systems throughout the world. Pamba river water with high amount of faecal coliform and suspended solids was subjected to chlorination dosage of 10mg/l for 30 minutes contact time followed by chlorination with sodium thiosuphate, Superchlorination resulted in the doubling of COD and BOD indicating the formation of more recalcitrant highly toxic chlorination derived by-products. As chlorination produces byproducts like Trihalomethanes and Halo acetic acids, we have developed alternate treatment strategies. It has been proved that chemicals are not a safe option for water disinfection. The newly formed compounds were extracted and were subjected to structural analysis. The data obtained indicated the presence of Trihalomethane, Haloaceticacid as the toxic chlorination derived by-products. Organic substances like bioflocculants, are better and dependable choice for aggregation of large flocs. Moriga seed powder mediated flocculation was used for the aggregation of large flocs due to slow process of sedimentation.Chlorination cannot be totally avoided. Chlorination only at low dose is recommended. Treatment with a natural bio flocculants like Moringa seed powder followed with mild chlorination was proved to be a safe practice of disinfection. This is the focus of our present investigation. Keywords: Trihalomethane, coagulation, flocuation, Chemical Oxygen Demand, Biological Oxygen Demand
Publication date: 01/01/2022

https://ijbpas.com/pdf/2022/January/MS_IJBPAS_2022_5809.pdf

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https://doi.org/10.31032/IJBPAS/2022/11.1.5809