间歇生物反应器中氮的赋存状态与转化规律研究

Research on the Occurrence State and Transformation Law of Nitrogen in Bioreactor

目前废水生物脱氮技术着重于对氨氮的去除，很难达到去除总氮的目的。为了更好的去除氨氮及总氮，实验研究了不同进水pH、溶解氧浓度、进水C／N比及不同温度条件下间歇生物反应器中氮的存在状态及其转化规律。结果表明：在生物反应器运行初期氨氮、总氮浓度均有明显的下降；进水氨氮浓度在30-70mg／L的污水，优化处理操作参数为pH值8．0±0．5，溶解氧（4．2±0．5）mg／L，温度20～26℃，C／N为6，曝气时间6h，沉淀2h，氨氮去除率可达到90％，总氮去除率接近60％。

The actual effect of biological removal of nitrogen is nothigh;it cannot achieve the purpose of the removal of total nitrogen either. In order to remove ammonia nitrogen and total nitrogen,this paper studies the main factors such as inflow pH,dissolved oxygen concentration,COD ∶NH4 +—N ratio and temperature affecting the occurrence state and transformation law of nitrogen in bioreactor.The concentration of ammonia nitrogen and total nitrogen significantly reduce simultaneous occurringat the preliminary stage.Under these conditionsof pH8.0±0.5,dissolved oxygen concentrationof(4.2±0.5)mg/L,20-26℃,COD:NH4 +—N ratio of 6,aeration time of 6handprecipitation of 2h,the removal rate of ammonia nitrogen reaches to 90%and total nitrogenre moves about 60%in the bioreactor comparing with the initial ammonia nitrogen concentration of 30-70mg/L.