污水处理厂氮排放特征

为了更好地掌握污水处理厂运行和排放情况，在全国南方、北方分别选取3个省共11个城市122家污水处理厂，于2013年8—10月进行了专项监测。结果表明：75?4％的污水处理厂氨氮出水质量浓度小于2 mg／L，氨氮平均去除率达90?2％，但总氮的平均去除率仅为55?5％，污水处理厂排水中仍存在较多非氨氮形态的氮污染进入环境。氨氮排放达标的污水处理厂中，有约20％的总氮排放未达标。65?5％的污水处理厂出水氨氮占总氮的比例低于10％，而84?4％的污水处理厂进水中氨氮占总氮的比例高于50％。总氮是影响污水处理厂达标排放的主要污染因子。

Study on the Characteristic of the Sewage Plant Emitting Ammonia Nitrogen

To know well sewage plant's running status and emission,select 122 sewage plants,located in 11 cities,3 provinces from north of China to south of China,carried out special monitoring from Aug to Oct in 2013. The result showed that 75.4% of the sewage plant emit low ammonia nitrogen,the concentration even less than 2 mg/L,the average degradation rate of ammonia nitrogen was 90.2%,but for total nitrogen was only 55.5%,in other words,much non-ammonia nitrogen were discharged into environment,almost 20% of the sewage plant that their ammonia nitrogen concentration reach the standard, cannot reach the total nitrogen standard,ammonia nitrogen concentration of effluent accounts for less than 10% of total nitrogen in almost 65.5% of the sewage plants,but accounts for more than 50% for raw sewage in almost 84.4% of the sewage plants,so total nitrogen was a major pollutant to prevent sewage plant from reaching some emission standard.