改良型氧化沟间歇组合曝气生产性试验研究

Combined Intermittent Aeration in Improved Oxidation Ditch

重庆市某区县城市污水处理厂采用恒定曝气方式运行,能耗和药耗偏高,且出水TN、TP浓度存在超标风险,为此根据进水水质、水量变化特征以及曝气系统的特点,提出了时间与空间上的间歇组合曝气运行方式。分别考察了间歇曝气氧化沟不同位置曝气机组合形成的3种模式的运行效果。结果表明,模式2为最优间歇组合曝气方式,与恒定曝气相比,全天平均DO浓度下降0.47 mg/L,对TN的去除率提高了20.1%,出水TN为10.36 mg/L,生物除磷率也相对恒定曝气提高了8.4%,相应的化学除磷剂投量从23.5 mg/L降低到14.5 mg/L,药耗下降了38.3%,电耗相比下降了12.2%。间歇组合曝气解决了运行中存在的问题,达到降低能耗、药耗和提高出水水质的双重效果。

A municipal WWTP in a county of Chongqing was operated with constant aeration,which caused high energy and chemical consumption and risked exceeding the discharge standard for effluent TN and TP. According to the characteristics of the changes in influent quality and quantity and the aeration system in oxidation ditch, a combined intermittent aeration operation mode in time and space was put forward. The operation effects of three combined intermittent aeration operation modes at different positions in the oxidation ditch were investigated in experiments. Mode 2 was the best combined intermittent aeration mode. Compared with results of constant aeration, the daily average DO concentration of mode 2 fell by 0.47 rag/L; the TN removal rate increased by 20.1%, and the effluent TN fell to 10.36 mg/L; the biological phosphorus removal efficiency increased by 8.4% ; the corresponding chemical phosphorus removal agent reduced from 23.5 mg/L to 14.5 rag/L, and chemicals consumption fell by 38.3% ; and the unit power consumption decreased by 12.2%.