【作者】 邵健；

【导师】 吴晓晖；

【作者基本信息】 华中科技大学 ， 建筑与土木工程， 2019， 硕士

【摘要】 目前,许多城市污水处理厂已完成改造,出水提升至一级A标准,部分水厂向地表水类IV类标准迈进。在进水低C/N条件下,如何进一步优化工艺,完成总氮的深度处理成为研究的热点。本文通过研究AOAO-MBR生物脱氮工艺,采用Biowin软件进行仿真模拟,为工艺的进一步优化提出建议和验证,为达到地表水类IV类的高排放标准提供技术支撑。主要结论如下:（1）探究AOAO工艺在不同碳氮比（C/N）、硝化液回流比（IR）、污泥回流比（r）下的运行效果。在化学需氧量（COD）平均进水195.0mgL、氨氮（NH₄⁺-N）平均进水21.3mg/L、总氮（TN）平均进水32.7mg/L条件下,确定分段进水比6:4、C/N在6:1、内回流比为200%、外回流比50%条件下的工况处理效果最好。COD、NH₄⁺-N、TN的平均出水分别为17.1mg/L、0.8mg/L和13.6mg/L,去除率依次为91.21%、96.23%和58.61%,出水可稳定达一级A标准。（2）增加MBR膜组件后,污泥浓度至4600mg/L左右,COD平均进水195.4mgL、氨氮进水21.2mg/L、总氮进水30.9mg/L条件下,系统最终COD出水平均12.3mg/L,去除率93.69%;氨氮平均出水0.5mg/L,去除率97.82%;总氮平均出水10.2mg/L,去除率66.88%。总氮的出水范围在8.5mg/L到12.1mg/L波动,出水不能稳定达地表水类Ⅳ类标准。（3）通过Biowin软件对AOAO-MBR工艺进行建模和优化,建议最佳运行参数为:MBR反应池内DO控制在1.2 mg/L,分段进水比6:4,内回流比为200%。采用优化方案进行论证实验,COD平均出水12.8mg/L,氨氮平均0.4mg/L,TN平均9.4mg/L,且出水可稳定达地表水类Ⅳ类排放标准。更多还原

【Abstract】 At present,many urban sewage treatment plants have been rebuilt,and the effluent has been upgraded to the Class A standard,and some water plants have advanced to Class IV standards for surface water.Under the condition of low water C/N,how to further optimize the process and complete the deep treatment of total nitrogen has become a research hotspot.In this paper,the AOAO-MBR biological nitrogen removal process was studied,and Biowin software was used for simulation simulation to provide suggestions and verification for further optimization of the process,and to provide technical support for meeting the high emission standards of surface water class IV.The main conclusions are as follows:（1）Exploring the operation effect of AOAO process under different carbon-nitrogen ratio（C/N）,nitrifying liquid reflux ratio（IR）and sludge reflux ratio（r）.Under the condition of chemical oxygen demand（COD）average water intake of 195.0mgL,ammonia nitrogen（NH₄⁺-N）average influent water of 21.3mg/L,and total nitrogen（TN）average influent of water of 32.7mg/L,the staged water inlet ratio is determined to be 6:4.The C/N has the best working condition under the condition of 6:1,internal reflux ratio of200%and external reflux ratio of 50%.The average effluent of COD,NH₄⁺-N and TN were 17.1mg/L,0.8mg/L and 13.6mg/L,respectively,and the removal efficiencys were91.21%,96.23%and 58.61%,respectively.The effluent could be stabilized to the first-class A standard.（2）After increasing the MBR membrane module,the sludge concentration is about4600mg/L,the average COD water inflow is 195.4mgL,the ammonia nitrogen influx is21.2mg/L,and the total nitrogen influent is 30.9mg/L.The final COD effluent of the system is 12.3mg/L,removal efficiency 93.69%;ammonia nitrogen average effluent0.5mg/L,removal efficiency 97.82%;total nitrogen average effluent 10.2mg/L,removal efficiency 66.88%.The effluent range of total nitrogen fluctuated from 8.5mg/L to 12.1mg/L,and the effluent could not be stabilized to the surface water class IV standard.（3）The AOAO-MBR process was modeled and optimized by Biowin software.The optimal operating parameters were:the DO control in the MBR reaction tank was 1.2mg/L,the stepwise water inlet ratio was 6:4,and the internal reflux ratio was 200%.The optimization experiment was carried out for demonstration experiments.The average COD of effluent was 12.8mg/L,the average ammonia nitrogen was 0.4mg/L,the average TN was 9.4mg/L,and the effluent was stable to the surface water category IV emission standard.更多还原