MSBR工艺强化生物脱氮生产性试验研究_邓仁健
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2020-02-02 08:04:47
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书MSBR工艺强化生物脱氮生产性试验研究邓仁健1,2,张金松2,3,曲志军3,吕伟3,杨靖波3,熊晔3(1.湖南科技大学土木工程学院,湖南湘潭411201;2.哈尔滨工业大学深圳研究生院环境科学与工程研究中心,广东深圳518055;3.深圳市水务<集团>有限公司,广东深圳518030)摘要:针对城镇污水处理厂MSBR工艺提标改造时出水氮、磷指标很难同时达到一级A标准的情况,提出了强化生物脱氮措施,包括提高污泥龄(SRT)、提高污泥内回流比r、调整混合液回流比R、延长SBR池缺氧时间、合理控制溶解氧等,并在SRT=12~15d、污泥外回流比r'=1.5、r=0.6、R=1、SBR池缺氧时间为50min的强化条件下进行生产性试验研究。结果表明,试验组的TN去除率比对照组高了16.06%,出水TN和氨氮浓度均能稳定达到一级A标准,缺氧池、好氧池和SBR池缺氧阶段的TN去除率分别为14.1%、26.3%和24.8%,微生物协同作用和后置反硝化是MSBR工艺的主要脱氮途径,强化后置反硝化是提高MSBR工艺脱氮效果的主要方法;但强化脱氮措施对系统除磷有一定影响,试验组的TP去除率比对照组低6.10%。关键词:MSBR工艺;强化生物脱氮;运行参数优化;后置反硝化;厌氧吸磷中图分类号:X703文献标识码:A文章编号:1000-4602(2014)07-0009-05Full-scaleExperimentofEnhancedBiologicalNitrogenRemovalinMSBRProcessDENGRen-jian1,2,ZHANGJin-song2,3,QUZhi-jun3,LYUWei3,YANGJing-bo3,XIONGYe3(1.SchoolofCivilEngineering,HunanUniversityofScienceandTechnology,Xiangtan411201,China;2.EnvironmentalScienceandEngineeringResearchCenter,GraduateSchoolatShenzhen,HarbinInstituteofTechnology,Shenzhen518055,China;3.ShenzhenWater<Group>Co.Ltd.,Shenzhen518030,China)Abstract:Amodifiedsequencingbatchreactor(MSBR)processcouldnotensuretheeffluentTNandTPtomeetthefirstlevelAcriteriainthemunicipalwastewatertreatmentplant.Enhancedbiologicalnitrogenremovalmeasureswereputforward,includingimprovingtheSRTandthesludgerecycleratio(r),adjustingmixed-liquorreturnratio(R),increasingSBRtankanoxictime,controllingdissolvedox-ygenintheaerobictank,andsoon.Theexperimentwascarriedoutunderfollowingoperatingcondi-tions:SRT=12to15d,externalsludgerecycleratiowas1.5,r=0.6,R=1,SBRtankanoxictimewas50min.Theexperimentalresultsshowedthatthenitrogenremovalrateintheexperimentalgroupin-creasedby16.06%comparedtothecontrolgroup,meetingthestandardrequirement.Thenitrogenre-movalratesintheanoxictank,aerobictankandanoxicphaseofSBRtankwere14.1%,26.3%and24.8%,respectively.Thisimpliedthatpost-denitrificationandassimilationwerethemainmethodsfornitrogenremoval.However,thephosphorusremovalrateintheexperimentalgroupdecreasedby6.10%comparedtothecontrolgroup,showingthatenhancedbiologicalnitrogenremovalhadane
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