A-A^2/O工艺提质改造城市污水厂实践

Practice of Up-to-standard Reconstruction for Sewage Plant by A-A^2/O Process

某市D污水处理厂设计时执行《污水综合排放标准》(GB8978-1996)中二级标准,无法达到现行标准《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准对脱氮除磷的要求,且进水具有明显的低C/N特征,为此对污水处理系统进行了改造,新建生物选择池、厌氧池和缺氧池,结合原有的卡罗塞尔氧化沟组成A-A2O工艺,生物选择池可以消除硝化液对厌氧除磷的不利影响,提高后续A2O工艺的脱氮除磷效果,出水水质能稳定达标,该工程可以为老厂脱氮除磷工艺改造提供参考.

Second class of the ＂Integrated Wastewater Discharge Standard＂（GB8978-1996） was employed by some projects constructed before 1999.It is unable to meet the current national sanitary standard of first B class of ＂Municipal Wastewater Treatment Plant discharge standards＂（GB 18918-2002） at nitrogen and phosphorus.Water quality parameters of inflow have characteristics of low C/N.Sewage treatment system has been reconstruction for up-to-standard.Bioselection pool,anaerobic tank and Anoxic tank have been construction to combine with Oxidation Ditch to A-A2O Process.Bioselection pool can eliminate the adverse effects of nitrification solution on anaerobic phosphorus and improve the effect of nitrogen and phosphorus removal process for the follow-up A2O.It can provide a reference for the old factory converted into nitrogen and phosphorus removal process.