The Nitrogen And Phosphorus Removal Engineering Practice Of A Sewage Treatment Plant Of Huainan

Fengtai sewage treatment plant was built in2002, after the first phase of2.5x104m3/d, the second phase project is completed the whole plant sewage treatment capacity of5x104m3/d. In this paper, Fengtai sewage treatment plant, for example, to carry out the effect of phosphorus and nitrogen removal study. Plant a project using oxidation ditch process sewage, nitrogen, phosphorus pollutant removal rate; to be "urban sewage treatment plant pollutant discharge standard"(GB18918-2002), the use of denitrification (DN) and biofilter chemical phosphorus removal method, the original deal with the implementation of the upgrading process, and further removal of sewage nitrogen and phosphorus pollutants. In order to investigate the effect of phosphorus and nitrogen removal wastewater treatment process after the first phase of reconstruction, to carry out the whole process of the sewage treatment process sampling and monitoring, focusing on the monitoring of nitrogen, phosphorus pollutant removal efficiency, the transformation of the former study, nitrogen, phosphorus pollutant removal trends.Monitoring results showed that the average water quality at different times before the transformation of major pollutants:biochemical oxygen demand (BOD5)127.4mg/L, ammonia (NH3-N)21.96mg/L, total nitrogen (TN)29.59mg/L, total phosphorus (TP)8.62mg/L, the average removal of pollutants:BOD596.3%, NH3-N86.0%, TN46.9%, TP27.1%; average water quality:BOD53.8mg/L, NH3-N3.07mg/L, TN15.72mg/L, TP6.29mg/L, total nitrogen, total phosphorus exceeded GB18918-2002standard in a B, especially total phosphorus exceeded serious. By DN biofilter and chemical phosphorus removal, the average removal rate of major pollutants:BOD597.0%, NH3-N86.1%, TN70.0%, TP91.4%; effluent after treatment: BOD53.8mg/L, NH3-N3.05mg/L, TN8.88mg/L, TP0.74mg/L, nitrogen, phosphorus pollutant removal improved significantly compared with that before the transformation of water quality, total nitrogen, total phosphorus removal rates were increased by33%,70.4%, can be achieved GB18918-2002in an A standard.In view of the above, Fengtai sewage treatment plant after upgrading a project, effectively eliminates the original secondary effluent nitrogen and phosphorus pollution, the effect is significant, for the treatment process similar to other urban sewage treatment plant construction and renovation, has an extremely important reference.Fengtai sewage treatment plant in an engineering major pollutant removal efficiency of monitoring, press the phosphorus and nitrogen removal structures-oxidation ditch depth, three-tier monitoring the implementation of sewage, while increasing the monitoring of nitrate and nitrite project aims to analyze the entire sewage treatment process transverse nitrogen, phosphorus distribution of contaminants, as well as nitrogen and phosphorus pollutants in the oxidation ditch along the depth trends.