The Depth Treatment Process Of Urban Sewage Treatment Plant Secondary Effluent

With the improvement of living standards, the national requirements for the discharge of urban sewage treatment after the water has also been gradually improved,at present our country most of urban sewage treatment plant effluent can reach “the town sewage treatment plant pollutant discharge standard "(GB18918-2002) in the secondary effluent standard, city life sewage treatment plant effluent and some developed countries is much higher than the requirement, the current domestic sewage treatment to city life after water depth treatment technology are mainly composed of membrane process, but the high cost of investment cost and operation maintenance,short service life. This paper in view of the water after the city life sewage, the investment cost and operation cost under the condition of equivalent to 1/20 film processing, by activated sludge process, the active filler combination of the biological filter and water distribution of vertical flow constructed wetland process after the combination of urban sewage treatment in the form of water depth processing.By Chengdu university of technology and Jingxing environmental technology of Sichuan mutual cooperation, design of 45m3 each day secondary urban sewage depth processing integrated industrial pilot plant effluent reach “the surface water environment quality standard basic standard limit "(GB3838-2002) in the V requirements and above, the combination device has good and stable discharging water, covers an area of less, simple operation, low operating cost. Device start early main modification of filter material is studied and the result analysis; Of activated sludge culture and domestication, inspected the influence factors of training phase;The influence factors of the active filter process of stable operation and operation result were analised.Using FeCl3?6H2O on modification, the filter material with iron content determination, XRD and SEM and chemical characterization and Zeta potential analysis; The results show that the modified filter material of COD in wastewater treatment is not modified filter material 5~7 times. Through to start installing device, sludge domesticated to stable operation of system, on the depth of secondary urban sewage water treatment; Remove the overall water quality is higher than surface water Ⅴ requirements. Stable stage to study the influences of temperature inflow water quality on the system, the results show that temperature hasa great effect on COD, water quality in a certain range fluctuations small impact on the system.