不同工况对A 2/O工艺的处理效果研究

Study on the Treatment Effect of A 2/O Process under Different Operating Conditions

基于高原环境下的A 2/O工艺,以温度、溶解氧(DO)、水力停留时间(HRT)为控制工况,采用单因素控制变量法,对化学需氧量COD、总磷(TP)、总氮(TN)及氨氮(NH+4-N)4个水质指标,根据GB 18918—2002《城镇污水处理厂污染物排放标准》进行分析。结果表明,温度最佳工况为10℃,出水COD、NH+4-N和TP分别符合一级A标准、一级B标准和二级标准;DO最佳工况为4.5 mg/L,COD和TN达到一级A标准,NH+4-N和TP分别达到二级标准和三级标准;未得出HRT的最佳工况,当HRT为26.25 h,出水COD的处理效果最佳,符合一级A标准。

Taking the temperature, DO and HRT as control conditions, the single factor control variable method is used to study the treatment effects of the A2/O process in the plateau environment, in which, four water quality indicators of COD,TP, TN and NH4+-N are analyzed according to the specification of "Discharge Standard of Pollutants for Municipal Waste-water Treatment Plant"( GB 18918-2002). The results show that,( a) the optimal temperature condition is 10℃, and under this condition, the effluent COD, NH4+-N and TP meet the first-class A standard, the first-class B standard and the second-level standard respectively;( b) the optimal DO condition is 4. 5 mg/L, and under this condition, the COD and TN meets the firstclass A standard, and the NH4+-N and TP reach the secondary standard and the third-level standard respectively;and( c) the best operating condition of HRT is not obtained, but when the HRT is 26. 25 h, the effluent COD has the best treatment effect and meets the first-class A standard.