竖流式一体化反应器处理乡镇污水的影响因素

设计了1种竖流式一体化反应器用于处理乡镇生活污水,该反应器将原本A2/O工艺中单独设置的厌氧区、缺氧区、好氧区和沉淀区整合为一体,实验考察了HRT和好氧区DO含量对处理效果的影响。结果表明,4组好氧区HRT分别为6、8、10、12 h时,COD、NH3-N、TN、TP的去除率分别为69%~81%、77%~87%、74%~81%、73%~82%;当好氧区DO的质量浓度分别为1.5、2.5、3.5 mg/L时,COD、NH3-N、TN、TP的去除率分别为69%~79%、76%~84%、72%~79%、74%~79%。综合考虑处理效果和成本,HRT为8 h、DO的质量浓度2.5 mg/L时较为适合,此时出水COD、NH3-N、TN、TP均可满足GB 18918-2002污水排放一级A标准。该竖流式一体化反应器具有结构紧凑、占地面积小等特点。

Influencing Factors of Vertical Flow Integrated Reactor for Township Sewage Treatment

Avertical flow integrated reactor was used to treat township domestic sewage. The reactor integrated the anaerobic zone, anoxic zone, aerobic zone and sedimentation zone which separately set up in the original A2/O process, the effect of H RT and DO content in aerobic zone on the treatment efficiency were investigated. The results showed that the removal rates of COD , NH3-N, TN and TP were 69 %-81%, 77%-87%-74%-81 %, 73 %.82 % respectively in the four sets of HRT conditions (6 h, 8 h, 10 h, 12 h). When mass concentration of DO in aerobic zone was 1.5 mg/L, 2.5 mg/L and 3.5 mg/L, the removal rates of COD, NH3-N,TN and T P were 69 %.79%, 76 %-84%,72 %-79 % and 74 %.79%, respectively. Considering the treatment effect and cost, the optimum operation parameters were as follow, HRT was 8 h and mass concentration of DO was 2.5 mg/L,the COD , NH 3-N, TN and TP could meet the first level Astandard of sewage discharge of GB 18918.2002.