基于结构和工艺流程革新的AO工艺提标改造

Upgrading and renovation of AO process based on structure reconstruction and process-flow innovation

通过实验进行了基于结构造和工艺流程革新的AO工艺提标改造研究。改造前后的对比实验结果表明,提标改造后的D-A^2O反应器在(24±2)℃温度下COD、TN、NH_3-N、TP去除率分别可达92.24%、84.77%、98.65%和92.11%,比AO反应器相应污染物去除率分别提高了5%、14%、14%和20%,出水水质优于GB 18918-2002中一级A标准;同时,本升级改造后形成的D-A^2O反应器于不同温度下具有较强的稳定性,且污泥龄(SRT)可延长至30~35 d。根据小试结果粗略估算,将AO改造成D-A^2O技术所需增加的基建投资费用小于AO工艺原有基建费用4%,可节约污水处理运行费用约6%。结果表明,提标改造在技术上和经济上均具有可行性。

A laboratory-scale experiment was conducted to examine the upgrading and renovation of an AO process,based on reconstruction of the plant and process-flow innovation. The results show COD,TN,NH3-N,and TP removal rates of 92. 24%,84. 77%,98. 65%,and 92. 11%,respectively,in the D-A2 O reactor at a temperature of（ 24 ± 2） ℃. These results represent increases of 5%,14%,14%,and 20%,respectively,compared to those of the AO reactor. Consequently,effluent from the D-A2 O reactor was of better quality than the A（ first-level） effluent standard. Furthermore,the upgrading and renovation of the D-A2 O reactor was stable operation at different temperatures,and the sludge retention time（ SRT） of the D-A2 O reactor was extended to 30 to 35 d. Based on the results of the laboratory-scale trial,the capital cost of this upgrade and renovation represent less than 4%of the original construction（ AO process） cost,and operational costs could be reduced by approximately 6%. The results of the trial indicate that this upgrade and renovation is technically and economically feasible.