缺氧接触氧化/生物转盘组合工艺处理农村生活污水

Treatment of Rural Domestic Sewage by Combined Process of Anoxic Contact Oxidation/Rotating Biological Disc

采用缺氧接触氧化/生物转盘组合工艺处理农村生活污水,研究了组合工艺对污水的处理效果和影响因素。反应器在室温(≥17℃)下运行,当进水COD平均为122.6mg/L.水力停留时间为4h、回流比为150%、溶解氧为2.23mg/L时,系统达到最优运行效果,此时对COD、氨氮和TN的去除率分别达到78.8%.84.9%和51.0%,出水水质优于《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准。该组合工艺可以有效处理低浓度、低碳氮比的农村生活污水,并且氨氮和TN的去除效果与水力负荷、回流比和转盘转速密切相关。

The combined process of anoxic contact oxidation and rotating biological disc was used to treat rural domestic sewage, and the influence factors and treatment effect were studied. When temperature was higher than or equal to 17 ℃,influent COD concentration was 122. 6 mg/L, HRT was 4 h, reflux ratio was 150% and DO was 2. 23 mg/L, the combined process reached the optimum operational status. The removal rates of COD, NH4^+-N and TN reached 7& 8%, 84. 9% and 51. 0% respectively, and the effluent quality was better than the level A limitation of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant ( GB 18918-2002 ). The combined process could effectively treat low concentration and low C/N ratio rural domestic sewage, and the removal efficiencies of NH4^+-N and TN were closely related to hydraulic loading, reflux ratio and rotating speed.