Study On The Choice And Effects Evaluating Of The Sewage Treatment Technologies In Townships Of The Urban Fringe

Through the method of field sampling and indoor analysis, this paper analyzed the domestic wastewater quality of Chating town of Wangcheng District treated by sewage treatment plants and four grid purifying pool,and further explored how to build a reasonable construction, management and operation mode of the sewage treatment facilities of the city fringe area. The results will provide references and certain experiences for sewage treatment of similar city fringe area.Some important results were concluded as followings:(1)Domestic sewage treated by biological contact oxidation proc ess can meet the level of first grade B standard of "Discharge stan dard of pollutants for municipal wastewater treatment plant"(GB18918-2002). The removal rate of CODcr, plant and animal oil and an ionic surfactant between84%and90%; the removal rate of SS, TP, NH3-N, BOD5and Chroma between68.5%and73.5%had the better effect.(2) Domestic sewage treated by four grid purifying pool can reach the "water quality standard of Farmland Irrigation" and the secondary standard of "Discharge standard of pollutants for municipal wastewater treatment plant"(GB18918-2002), applicable to agricultural water district and the general requirement of landscape waters.The removal rate of SS, CODcr, BOD5, NH3-N, TP were93.4%,90.2%,89.2%,88.2%and 79.9%.(3) According to the sewage situation of the city fringe area, we should build sewage treatment plants in the centralized region for highly efficient; and use four grid purifying pool in scattered population areas to meet irrigation requirements.