Chemically assisted primary treatment of municipal wastewater

The objective of this work is studying the use of chemicals to enhance primary treatment in municipal wastewater treatment plants, thereby reducing the cost of the secondary treatment stage. Jar tests using chemicals, polymers and sea water have been conducted to determine the best performing chemicals, alone and in combinations. The process performance parameters studied were pH, type and dosage of coagulant, mixing intensity, detention time, settling time and addition of coagulant aid. The efficiency of the process has been measured as percentage removals in COD, TSS, turbidity, settleable matter and removals of heavy metals. The results proved the improvement of removal efficiencies.