STUDY OF REMOVAL OF COD BY GUARGUM WITH COAGULANTS ALUM AND POLYALUMINIUM CHLORIDE IN WASTEWATER TREATMENT

This project work was conducted to study removal of COD from tannery effluent by coagulants which includes analysis of physico-chemical parameters of tannery effluent as well as the treatment efficiency of alum, PACl, their combination (alum + guargum) and (PACL + guargum). Sample collection and analysis were performed using standard methods for the examination of water and wastewater (1998). Tannery effluent has been treated with the coagulants. The influences of pH and coagulant dosages were studied. The effectiveness of chemical coagulants and guargum were measured by the reduction of COD. The results shows that the combination of coagulant PACl + guar gum is more effective than alum, PACl and alum +guargum. It can achieve upto 97 % of COD reduction at low dosage of PACl (100 mg/l)and guargum (500- 1000 mg/L). The results indicate that lower quantities of PACl are needed to obtain an acceptable reduction in COD in the treatment of tannery effluent