Studies on Nirmali Seed Extract as Coagulant Aid

The extract of an indigenous natural source of polyelectrolyte, nirmali seed, was found to be effective in small doses as an aid in the coagulation of turbid waters by metal coagulants. The extract was found to (1) improve floc size and clarification, (2) reduce considerably the dose of metal coagulant required, (3) remove efficiently the colour bodies from water, (4) overcome the interference of phosphate on coagulation of water by alum and (5) broaden the pH range of coagulation by alum, thereby increasing the flexibility of pH control.