污泥运行指标对AAO氧化沟生物脱氮的影响研究
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2020-04-09 22:29:22
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第34卷第5期2014年5月工业水处理IndustrialWaterTreatmentVo1.34No.5May.2014污泥运行指标对A/A/O氧化沟生物脱氮的影响研究李柏林,一,章文琴,张智,李晔,宋梦婷(1.武汉理工大学资源与环境S-程学院,湖北武汉430070;2.重庆大学-Z峡库区生态环境教育部重点实验室,重庆400045)[摘要]采用实际城市污水,研究污泥回流比、污泥龄和污泥浓度(MESS)对中试A,A/0氧化沟脱氮的影响。结果表明:系统脱氮能力随污泥回流比增大而增强,大于9O%时,NH4~-N和TN去除率没有明显提高,还会增加能耗。污泥回流比为60%90%,泥龄为15~20d时脱氮效果较好,还需根据进水负荷和脱氮效果进行调节。MIsS对工艺同时硝化反硝化(SND)有显著影响,当MIJSS从3000Ing/L增至6000mg/L时,NHN去除率从81.7%增至98_8%,TN去除率从47.2%增至66%.SND/TN从19.8%增至37.4%。[关键词】0氧化沟;脱氮;污泥回流比;污泥龄;污泥浓度[中图分类号]X703.1[文献标识码]A[文章编号]1005—829X(2014)05—0028—05ResearchontheinfluenceofsludgerunningindexesonthebiologicaldenitrificationbyA/AIOoxidationditchprocessLiBolin1,2ZhangWenqin,ZhangZhi2,LiYe,SongMengting(1.SchoolofResourcesandEnvironmentalEngineering,WuhanUniversityofScience&Technology,Wuhan430070,China;2.KeyLaboratoryoftheThreeGorgesReservoirRegion’SEco-Environment,DepartmentofEducation,ChongqingUniversity,Chongqing400045,China)Abstract:Usingactualdomesticsewage,theeffectsofdifferentsludgerecyclerate,SRTandMLSSondenitrificationbypilotscaleA/A/Ooxidationditchprocesshavebeenstudied.Theresultsshowthatwiththeincreaseofsludgerecyclerate,thedenitrificationcapacityofthesystemisenhanced.Whenthesludgerecyclerateisgreaterthan90%,theremovingratesofNH4+-NandTNdonotimprovesignificantly,buttheenergyconsumptionisincreased.Whenthesludgerecyclerateisgenerallyintherangeof60%to90%,andsludgeage15-20d,thedenitrificationeficacyisgood.Adjustmentneedstobemade,accordingtoinfluentloadinganddenitrificationeficacy.MLSShasobviouseffectonsimultaneousnitrificationanddenitrification(SND)processes.WhenMLSSincreasesfrom3000mg&to6000mF#L,NH4-Nremovingrateincreasesfrom81.7%to98.8%,TNremovingrateincreasesfrom47.2%to66%.andSND,rIincreasesfrom19.8%to37.4%.Keywords:anaerobic—anoxic·aerobicoxidationditch;denitrification;sludgerecyclerate;sludgeretentiontime;mixedliquidsuspendedsolids氮素超标排放是造成水体污染和富营养化的重要原因之一⋯。近年来。随着城市化进程的加快,氮素等营养物质大量排入水体.导致水体富营养化程度越来越严重水体富营养化不仅破坏了水体原有的自然生态环境.而且对周围环境也造成了严重污染目前普遍认为生物脱氮是去除水体氮素污染最经济有效的方法之一A/A/O氧化沟是一种高效污水生物脱氮工艺.其结合了A/0工艺和氧化沟
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