AAO法处理焦化废水中氨氮及COD的实验研究

摘要

采用厌氧-缺氧-好氧工艺处理焦化废水，在稳定运行阶段，考察了系统及其各反应段对COD及氨氮的降解情况。结果表明，系统对COD及氨氮的去除率分别为86.7％，97.2％，最终出水COD浓度低于150 mg/L，氨氮浓度低于15 mg/L，达到国家废水排放标准。系统运行稳定时，各段对COD及氨氮的降解能力不同：COD去除率由大到小为缺氧池、好氧池和厌氧池；氨氮去除率由大到小为好氧池、缺氧池和厌氧池，初步探讨了AAO各段运行机理。%Coking wastewater was treated by anaerobic/anoxic/aerobic bioIogicaI process,the degradation conditions of COD and NH3-N in units of the AAO system and the whoIe system were investigated in sta-bIe operation phase. The resuIts show:the removaI rates of COD and NH3-N were 86. 7% and 97. 2%,re-spectiveIy. The average concentration in effIuent for COD and NH3-N were Iess than 150 mg/L and 15 mg/L,respectiveIy,which couId meet the nationaI discharge standard. When the system was running normaIIy and stabIy,the removaI rates of COD and NH3-N in units of the system were very different:of COD from big to smaII in proper order were:anoxic stage,aerobic stage and anaerobic stage,and of NH3-N was as foIIows:aerobic stage,anoxic stage and anaerobic stage. FinaIIy,the running mechanism in units of the AAO system were primary discussed.