生物膜A^(2)/O工艺处理度假型乡村生活污水的实际运行效果

Study on the Practical Operation Performance of Biofilm A^(2)/O Project for Treating Rural Domestic Sewage of a Tourism Country

基于农村生活污水具有体量小、水质水量波动大的特点,区别于市政污水,因此研发了适用于农村生活污水的处理工艺。采用生物膜A^(2)/O工艺处理度假型乡村生活污水,该工程设计最大处理能力150 m^(3)·d^(-1),总水力停留时间40.9 h。为探究该工艺实际运行效果历时10个月,对CODcr、氨氮(NH_(3)-N)和总磷(TP)3个重要指标进行跟踪监测,分析其去除效率及季节气温对去除效果的影响。数据显示,在进水水质水量剧烈波动以及存在冬季低温情况下,CODcr、氨氮和总磷的平均去除率分别为64.32%,51.00%和46.06%,出水平均浓度均达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级B。冬季进水的3个污染物指标浓度低于夏季,同时季节对COD和氨氮去除率的影响大于对总磷去除率的影响。系统具有较强抗冲击能力,工艺增强了氮的硝化效果。

Based on the characteristic of low flow and high fluctuation in water quality and quantity of rural domestic wastewater,which differ from municipal sewage,a kind of A^(2)/O process with biofilm was developed to utilized in treating rural domestic sewage from a tourism country.Through a ten-month operation with a designed flow capacity of 150 m^(3)·d^(-1)and a HRT of 40.9 h,CODcr,NH_(3)-N,TP was monitored and studied to research the practical treatment performance and the impact from seasonal termperature.Data revealed that the average removal rate for CODcr、NH_(3)-N and TP was 64.32%,51.00%and 46.06%respectively and effluent average concentration all reach the applicable discharge standard of GB18918-2002 the first class B under the situation of huge fluctuation on flow and water quality and low temperature in winter.The inflow pollutant concentrations of three indicators in winter were lower than that in summer.And seasonal temperature worked more on impacting the removal rate of CODcr and NH_(3)-N.It was observed that the process had a good resistant performance to shock-load on irregular water quality and flow,and nitrification function was well established.