Analysis on sludge performance of aerated and mechanical coagulation in the enhanced primary treatment by chemical coagulation

The water quality treated by aeration coagulation sedimentation is superior to the one by mechanism coagulation,and the performance of the sludge by aeration coagulation sedimentation is also better than that of the mechanism coagulation.The initial stage of sedimentation performance by aeration coagulation is not quite satisfactory,but the later stage has the kind of sedimentation process similar to that of the mechanism coagulation.The moisture content of the sludge by aeration coagulation sedimentation with its maximum value being 94% and minimum being 93%,is one percent more than that of the sludge by mechanism coagulation.The sludge specific resistance of the aeration coagulation is lower than that of mechanism coagulation,and MLSS of aeration coagulation is higher than that of mechanism coagulation while VSS content of aeration coagulation is lower than that of mechanism coagulation,which well confirms the improvement made by aeration coagulation.