2级AO-电解除磷组合工艺处理农村生活污水

采用"2级AO-电解除磷"组合工艺对农村生活污水进行处理,以解决当前处理工艺污泥产量大,加药量大,除磷效果差等问题。结果表明,优化参数为:生物处理阶段选择以生物接触氧化为基础的2级AO(厌氧好氧工艺法)处理工艺,其中一级、二级A池停留时间(HRT)均为3 h,一级、二级O池HRT分别为6、3 h;电解除磷装置设置在二级A池和O池之间,HRT为1 h,电流密度28.57 A/m²,极板间距2 cm。以此优化参数对农村生活污水进行处理后,出水COD和NH₄⁺-N的质量浓度可分别降至8.7 mg/L和0.1 mg/L以下,TP和TN质量浓度可分别降至0.1 mg/L和7.5 mg/L以下,均达到GB 18918-2002的一级A标准。

Rural Domestic Sewage Treatment by Two-stage AO-Electric Dephosphorization Combined Process

The rural domestic sewage was treated by the ’two-stage AO-electric dephosphorization’ combined process to solve the problems of large sludge production,large dosage,and poor phosphorus removal effect.The results showed that,the optimal parameters were as follow,the biological treatment stage selected two-stage AO treatment(anaerobic and aerobic process) based on biological contact oxidation,the hydraulic retention time(HRT)of the primary and secondary A pool was 3 h,the HRT of the primary and secondary O pool was 6 h and 3 h respectively;the HRT of the electrical dephosphorization device which was set between the secondary A pool and O pool was 1 h,the current density was 28.57 A/m² and the plate spacing was 2 cm.After treating the domestic sewage with the optimal parameters,the effluent COD and ammonia nitrogen mass concentration could be reduced to less than 8.7 mg/L and 0.1 mg/L,respectively,TP and TN mass concentration could be reduced to less than 0.1 mg/L and 7.5 mg/L,respectively.They all met the Class A standard in the GB 18918-2002.