分段进水A/O工艺运行优化研究  

Operation Optimization of Step-feed A/O Process

作　　者：陈庆彩[1] 史江红[1] 李泽兵[2] 吴唯[1] 李军[2] 

机构地区：[1]北京师范大学环境学院水环境模拟国家重点实验室,北京100875 [2]北京工业大学建筑工程学院,北京100124

出　　处：《中国给水排水》2012年第9期73-76,共4页China Water & Wastewater

基　　金：国家自然科学基金资助项目(20877009);上海市环保科研项目(沪环科09-21);环保公益性行业科研专项(200909042)

摘　　要：基于Stella 9.0.1软件建立分段进水A/O工艺的ASM3水处理模型,并对模型进行简化,引入反映污泥中异养菌和自养菌活性的参数PXH和PXA。在HRT=10 h、VA/VO=2/6、R=75%及三级进水分配比N1∶N2∶N3=3∶4∶3的工艺状态下,由实测数据得出PXH和PXA的校正值分别为0.8 gCOD/gMLSS和0.05 gCOD/gMLSS。通过校正后的模型讨论了各种操作条件对出水COD、NH4+-N及NO3--N的影响。结果表明:HRT是影响出水COD浓度的最主要因素;增大污泥回流比R及缺、好氧池的容积比VA/VO都会减小出水NO3--N浓度;为保证出水的NH4+-N浓度较低,除提供充足的溶解氧和较长的水力停留时间外,第三段的进水分配比也不宜过大。综合考虑,较优的工艺参数值为HRT=14 h、R=50%、VA/VO=2/6及N1∶N2∶N3=1∶2∶1。将该参数运用于实际操作中,最终使系统对COD的去除率从77.6%提高到了94.1%,对TP的去除率也从30.2%提高到81.2%,实现了同步脱氮除磷。The ASM3 water treatment model for step-feed A/O process was built by Stella 9.0.1 software and simplified by introducing the parameters Px. and PXA＇ which reflect the activity of hetero- trophic bacteria and autotrophic bacteria in sludge. The corrected values of model parameters PXH and PXA were 0.8 gCOD/gMLSS and 0.05 gCOD/gMLSS. Calculations for PxH and PXA were made with measured data under the technological conditions HRT = 10 h, VA/Vo = 2/6, R = 75% and the step-feed ratio N1 ： N2 ： N3 = 3 ： 4 ： 3. The influence of the operating condition on the effluent COD, NH4 - N and NO3 - N in the corrected model was discussed. The result showed that HRT was the main factor affecting the effluent COD. Magnifying both the sludge reflux ratio R and the anoxic to aerobic volume ratio VA/Vo could decrease the effluent NO3- - N. To ensure a low NH4 - N concentration in the effluent, besides maintaining enough dissolved oxygen and long hydraulic retention time, the influent distribution ratio in the third stage should not be too large. With a comprehensive consideration, the optimized technological parameters were HRT = 14 h, R = 50% , VA/Vo = 2/6 and N1 ： N2 ： N3 = 1 ： 2 ： 1. When the optimized technological parameters were used in the actual operation, simultaneous nitrogen and phosphorus removal was realized. The removal rates of COD and TP in the step-feed A/O process improved from 77.6% to 94.1% and from 30.2% to 81.2%, respectively.

关 键 词：分段进水A/O工艺 参数优化 ASM3 同步脱氮除磷 

分 类 号：X703[环境科学与工程—环境工程]