硝化液回流比对水解-A/O工艺脱氮效果的影响  

Influence of nitrification liquid-reflux-rate on the nitrogen removal effect of the hydrolysis-A/O process

作　　者：梁康强[1] 周军[2] 熊娅[1] 陶涛[2] 

机构地区：[1]北京环境保护科学研究院,北京100037 [2]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2012年第12期117-122,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：环境保护部水体污染控制与治理重大科技专项资助项目(2008ZX07313);国家高技术研究发展计划资助项目(2009AA063802)

摘　　要：以低碳氮比城市污水为处理对象,在生产性试验规模上,研究不同硝化液回流比情况下水解-A/(缺氧-好氧)O工艺脱氮效果,并以相对小时去除量为评价量,讨论回流比对脱氮效果的影响.结果表明:水解-A/O工艺对COD,TN,NH4+-N,TP的平均去除率分别达到84.0%,64.2%,98.2%和73.2%,出水除TP和SS外,COD,TN以及NH4+-N都达到了GB18918—2002的一级A标准;在高硝化液回流比工况下,工艺运行效果更好;在硝化液回流比为200%的工况下,该工艺系统和水解池出水COD,NH4+-N,TN及TP比硝化液回流比为100%时分别低8.90,0.07,3.74,0.58mg/L和25.40,6.22,4.09,1.46mg/L.通过物料衡算,采用相对小时去除量的比值作为评价量,评价结果表明:在较高硝化液回流比条件下,水解池对污染物的去除能力增强,减轻了A/O生物池的去除负荷,进而增强了整个工艺对污染物的去除能力.Taking urban sewage of low C/N ratio as a treatment object in a productive scale test,different efficiency on nitrogen removal of the hydrolysis-A/O（anoxic-oxic） process at different nitrification liquid-reflux-ratio was studied.Simultaneously,the influence of nitrification liquid-reflux-ratio on nitrogen removal efficiency was discussed as the relative ratio of removal quantities was used for the evaluation.Results show that hydrolysis-A/O process has high removal efficiency of COD,TN,NH＋4-N,TP,and the average removing efficiency is 84.0%,64.2%,98.2% and 73.2% respectively.Apart from TP and SS,the A standard of GB18918—2002 is reached by other index.Meanwhile,it is more efficient when the nitrification liquid-reflux-ratio at the high ratio condition.Comparing with the condition of the nitrification liquid reflux ratio at 100%,the hydrolysis-A/O process system and the hydrolysis process system output water concentration of COD,NH＋4-N,TN,TP are 8.90,0.07,3.74,0.58 mg/L and 25.40,6.22,4.09,1.46 mg/L lower respectively when the nitrification liquid reflux ratio at 200 %.Because of different water quality conditions of the experiment at each stage,the material balance equations is done and the relative ratio of removal quantities per hour index βj,i is used for the evaluation of the removal ability of pollutant in different nitrification liquid reflux ratio.Evaluation results show that in the high nitrification liquid reflux ratio the hydrolysisi pool has higher removal capacity and then the removal loading of the A/O biological pool is reduced,at this case,pullutants removal ability of the entire process is enhanced.

关 键 词：水解-A O(缺氧-好氧)工艺 脱氮 硝化液 回流比 相对小时去除量 

分 类 号：X505[环境科学与工程—环境工程]