Study On The Biological Treatment Strengthened By Powdered Activated Carbon And Coagulants

China's increasingly severe situation of the environment and increasingly stringent wastewater discharge standards, making many of the wastewater treatment plants with an urgent need for a kind of bioaugmentation technology which is according with national conditions, economic and efficient to improve the removal rate of organic matter,N and P by the traditional activated sludge process, control and reduce the quantity of these three categories of pollutants into the receiving water.The experiment with sewage from the dormitory area in Xiamen university as the treatment target, adopted by the SBR reactor with A / O running as a platform to study if adding powdered activated carbon and coagulants will strengthen activated sludge removal capacity of organic matter,N and P and some preliminary conclusions as follows:(1) Activated sludge with one-time dosing powdered activated carbon in entire process can strengthen the removal of organic matter, and being related to the dosage, the removal rate of COD after one-time dosing 2.4 g of powdered activated carbon(as reactor volume:400 mg/L) compared to the comparison group increased the percentage of the average reached 5.17 percent, while one-time dosing 1.2 g of powdered activated carbon( as reactor volume:200 mg/L) only 2.45 percent; one-time dosing powdered activated carbon in entire process can not be markedly improved system of NH₃-N, TN and TP removal, but can reduce suspended solids of effluent and improve the settlement of activated sludge. Daily supplying 0.3 g powdered activated carbon (as influent amount: 100 mg/L) have no effect on strengthening activated sludge to remove contaminants.(2) Adding coagulants 30 minutes before the end of aeration in each cycle can greatly improve TP removal rate of the system, and to maintain high stability, which in the 100 mg / L (as influnet) of the dosage, ferric chloride and aluminium sulfate toward the TP removal compared to the comparison group increased the percentage of average respectively 69.95 percent and 65.52 percent, best on the chemical-assisted phosphorus removal effect, and the coagulants did not have a significant adverse impact on the ability of removing other pollutants of the activated sludge, but can improve the performance of its settlement.(3) Daily supplying 0.3 g of powdered activated carbon can ease the inhibition on the heterotrophic microorganisms in the activated sludge by the phenol, but no obvious effect on the nitrifying bacteria; powdered activated carbon can serve to prevent activated sludge from floc separating.