曝气沉砂除油池对污水厂脱氮除磷的影响
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2020-03-02 11:02:19
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书第46卷第2期2014年2月哈尔滨工业大学学报JOURNALOFHARBININSTITUTEOFTECHNOLOGYVol.46No.2Feb.2014曝气沉砂除油池对污水厂脱氮除磷的影响邓仁健1,2,张金松1,3,吕伟3,曲志军3(1.哈尔滨工业大学深圳研究生院环境科学与工程研究中心,518055广东深圳;2.湖南科技大学土木工程学院,411201湖南湘潭;3.深圳市水务(集团)有限公司,518030广东深圳)摘要:为准确评价曝气沉砂除油池对城市污水厂脱氮除磷的影响,从水质特征、出水污染物浓度、去除效率、活性污泥组成、产泥量、物质平衡等角度,全方面考察具有长水力停留时间(大于10min)的曝气沉砂除油池预处理对后续生物处理工艺的影响,并与旋流沉砂池预处理进行对比.结果表明:曝气沉砂除油池预处理后,原水碳源损失比较严重,减小二级生化处理系统进水的COD与TN比和COD与TP比,不宜在低碳氮比进水的城市污水厂中使用;二级生化处理系统的TN和TP去除率分别下降了5.87%和10.22%;改变系统的活性污泥组成,使活性污泥中TN含量增加,而TP的含量减少.物质平衡原理的工艺评价方法也表明曝气沉砂除油池预处理会减小二级生化处理可利用碳源.具有长水力停留时间的曝气沉砂除油池预处理对城市污水厂脱氮除磷有负面影响.关键词:曝气沉砂除油池;工艺评价;物质平衡;脱氮除磷;城市污水厂中图分类号:X703.1文献标志码:A文章编号:0367-6234(2014)02-0049-06Theeffectofaeratedgritanddegreasingtankonfull-scaleWWTPnutrientandphosphorousremovalperformanceDENGRenjian1,2,ZHANGJinsong1,3,LWei3,QUZhijun3(1.EnvironmentalScienceandEngineeringResearchCenter,HarbinInstituteofTechnologyShenzhenGraduateSchool,518055Shenzhen,Guangdong,China;2.SchoolofCivilEngineering,HunanUniversityofScienceandTechnology,411201Xiangtan,Hunan,China;3.ShenzhenWater(Group)Co.Ltd.,518030Shenzhen,Guangdong,China)Abstract:Toevaluatetheeffectofaeratedgritanddegreasingtank(AGDT)withlonghydraulicretentiontime(>10min)onnutrientandphosphorousremovalperformanceatmunicipalwastewatertreatmentplant(WWTP),influentcharacteristics,effluentquality,removalefficiencies,activatedsludgecharacteristicsandcomposition,aswellasperformanceassessmentbasedonmassbalanceevaluation,wereinvestigatedinafull-scaleWWTP.Theexperimentalresultsshowedthat:ComparedwithPistagridpre-treatment,AGDTpre-treatmentwasunsuitabletobeusedinWWTPwithlowC/NratewastewaterbecauseitconsumedmorecarbonsourceandledtodecreaseofeffluentCOD/TN/TPrates;Thetotalnitrogen(TN)removalefficiencyandtotalphosphorus(TP)removalefficiencydecreased5.87%and10.22%;TheactivatedsludgecharacteristicsandcompositionwerechangedwithTNcontentincreasedandTPcontentreduced;MassbalanceevaluationapproachalsoshowedthattheavailablecarbonsourcewasdecreasedinsecondarybiochemicaltreatmentafterAGDTpre-treatment.Ther
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