潜流人工湿地-生物接触氧化处理低温低浓度生活污水

在低温低浓度生活污水的实验研究中，回流比和气水比是影响潜流人工湿地一生物接触氧化组合工艺污染物去除效果的重要因素，推荐回流比R=1．0，气水比为4：1，在该工况下，进水COD浓度在170．8～221．3mg／L时，平均去除率可达90％；进水NH3-N浓度在17．3～25．9mg／L，平均去除率45％～65％；进水TN浓度在25．1～38．49mg／L时，平均去除率45％～65％；进水TP浓度在2．2～3．1mg／L时，平均去除率65％～80％。污染物沿程浓度分析结果表明，该组合工艺可以在低温季节通过曝气促进氨氮硝化，大幅提高NH3-N和TN去除率，同时可以充分发挥复合潜流湿地功能。

Combined process of subsurface flow constructed wetland and bio-contact for treating low temperature and low concentration domestic sewage

Reflux ratio and gas-water ratio are quite important factors influencing the treatment efficacy of the combined process of subsurface flow constructed wetland and biological contact oxidation in the research of the treatment of domestic sewage characterized with low temperatures and low organics concentrations. The re- moval rates of NH3-N, TN and TP under the recommended reflux ratio of 1.0 and gas-water ratio of4：1 were in- vestigated. The average removal rate of COD could reach as high as 90% when the COD concentration of influx was 170. 8 ~221.3 rag/L; the average removal rate of NH3-N and TN ranged from 45% to 65% while the NH3- N and TN concentration of influx fluctuated from 17.3 to 25.9 mg/L and 25.1 to 38.49 mg/L, respectively; the average removal rate of TP was 65% ~ 80% with the influx TP concentration of 2.2 -3. 1 mg/L. The analyses of the organics concentration variation along the treatment process indicated that the removal rates of NH3-N and TN could be substantially increased by enhancing the ammonia nitrification with aeration under low temperatures, meanwhile the functionality of the combined subsurface constructed wetland could be utilized to its fullest extent.