I 摘要 城市污水处理一直被视为公益事业,尽管我国的城市污水处理事业取得了一定成就, 但在城市污水治理过程中,一直存在污水治理投入不足和污水处理行业整体运行效率低的 问题。“十二五”规划中指出,强化污染物减排和治理,加快城镇污水处理、垃圾处理设施 建设,加大重点流域水污染防治力度,严格污染物排放标准和环境影响评价。 该市工农业发展迅速,但城区周边街道排水设施建设与城市发展极不协调,致使该市 城区的河道和周边海域受到严重污染,直接影响到居民的生活质量和环境质量,同时也影 响了城市工农业和黄海海域渔业的发展。市民强烈要求加快市政排水设施建设,改善该市 城区及周边海域的生态环境,因此建设污水处理厂及配套收集管网已是当务之急。 文中以该市污水处理厂工程为例展开研究,研究内容包括污水处理厂水质水量的分析 与确定、工艺方案选择与分析及总体方案的确定等。根据该市的发展规划,对该区域内给 水量进行了合理化预测,确定该市污水处理厂设计规模为2万m3/d。参考国内类似规模处理 厂的进水水质,确定该市的污水处理厂设计进水水质为SS=220mg/L,BOD5=200mg/L, CODci=430mg/L,NH3-N=25mg/L,TP=4mg/L。结合该市污水处理厂的实际情况及设计要 求,对污水处理厂的二级处理工艺、深度处理工艺、消毒处理工艺、污泥处理工艺、除臭 工艺的分析与比较,最终确定了该污水处理厂的工艺方案,满足了该厂的设计要 筑物进行了设计参数优化和设计计算,确定污水处理方案并完成了施工图的设计。 该污水处理厂选用CAST工艺为二级处理工艺。深度处理采用静态管道混合器、网格 絮凝池、斜板沉淀池、动态滤布滤池处理工艺。采用紫外线消毒系统对于处理出水进行消 毒。污泥处理采用曝气工艺,对剩余污泥进行浓缩、脱水,污泥脱水,除臭工艺选择生物 除臭法。使处理出水水质达到《城市污水处理厂污染物排放标准(GB18918-2002)》一级 A排放标准。满足该污水处理厂设计要求,同时,也为其他污水处理厂设计提供参考。 关键词:污水处理工艺;工艺分析;经济技术比较;方案确定硕士研宄生学位报告 Abstract III Abstract Citysewagetreatmenthasbeenregardedasapublicwelfareundertakings,althoughthecity sewagetreatmentindustryinourcountryhasmadesomeachievements,butinthecitysewage treatmentprocessofsewagetreatment,therehasbeeninsufficientinvestmentandlowefficiency oftheoveralloperationofthesewagetreatmentindustryproblems.IntheEleventhFive-Year Plan,programmingpointsout,strengthenthepollutantsemissionreductionandmanagement,to speeduptheurbansewagetreatment,garbagedisposalfacilities,increasethepreventionand controlofwaterpollutioninkeyrivervalleysstrength,strictstandardsforpollutantsdischarge andenvironmentalimpactassessment.Fromthat,theurbansewagetreatmentinfrastructure constructionatpresentandinthefutureisstillaverylongperiodthesocialeconomic constructionisoneoftheimportantproblems.Morestrictstandardsandresourceconservation andenvironmentfriendlysocietytheconstructiongoal,tothecitysewagetreatmentplant constructioninthechoiceoftechnologicalschemeoptimizationandresourcetorational allocationanduseputforwardhigherrequest.So,forurbansewagetreatmentprocessprogram ofresearchanddesignoptimizationofparameterswillbecomethesewagetreatmentplant constructionofthenecessarypremise. Thecity'sindustrialandagriculturaldevelopmentisrapid,butthecitystreetsaroundthe drainagefacilitiesconstructionandcitydevelopmentisnotharmonious,resultinginthecity riverandthesurroundingwatersareseriouslypolluted,directlyaffectthequalityoflifeof residentsandthequalityoftheenvironment,butalsoaffectthedevelopmentofcityagriculture andfisheryintheYellowSeaseaarea.Publicurgedtospeedupthemunicipaldrainagefacilities construction,improvetheecologicalenvironmentofthecityandthesurroundingareaofthecity, sotheconstructionofsewagetreatmentplantsandsupportingpipenetworkisapressingmatter ofthemoment. Theengineeringofthecitysewagetreatmentplantasacasestudy,theresearchcontent includestheanalysisofsewagetreatmentplantwaterqualityandidentify,analyzeandprocess planselectionanddesignparametersoptimization.Accordingtothedevelopmentplanofthecity, usingthreekindsofmethodsforwaterconsumptionpercapitacomprehensiveindexmethod, unitconstructionlandindexmethodandthedifferentnatureoflandforwaterconsumptionindex oftheregiontothecontentofreasonableforecast,thecitysewagetreatmentplantdesign capacityof20000m3/d.Refertothedomesticsimilarscaletreatmentplantinfluentwaterquality, waterqualitydeterminationofplantdesignforSS=220mg/L,thesewagetreatment, BOD5~200mg/L,CODcr=430mg/L,NH3-N=25mg/L,TP=4mg/Lbinedwiththeactual situationandthedesignrequirementsofthecitysewagetreatmentplant,throughtheanalysisand comparisonofthetwogradetreatmentprocessandadvancedtreatmentprocessandsludge treatmentprocessofthewastewatertreatmentplant,canmaketheeffluentqualityreachedthe urbansewagetreatmentplantpollutantdischargestandards(GB18918-2002)aAemission standards,tomeetthedesignrequirementsthefactory,atthesametimetheconstructionofthe economicanalysisandthebenefitsoftheproject,designedandcalculatedparametersIV 摘要 硕士研究生学位报告 economicanalysisandthebenefitsoftheproject,designedandcalculatedparameters optimizationanddesignofthestructure,todeterminethesewagetreatmentprojectand completedthedesignofconstructiondrawing. Thesewagetreatmentplantselectioncastprocessforthesecondarytreatmentprocess,The depthoftreatmentbystaticmixer,pipelinegridflocculationtank,inclinedplatesedimentation tank,dynamicclothfiltertreatmentprocess.Thesludgetreatmentusesaerationprocess,andthe sludgeisconcentrated,dewatering,sludgedewatering,anddeodorantprocessischosenfor biologicaldeodorant..Theeffluentqualityofthetreatedeffluentisreachedthepollutant dischargestandard(GB18918-2002)oftheurbansewagefreatmentplantandtheAdischarge standardofthefirstgrade.Meetthedesignrequirementsofthesewagetreatmentplant,butalso forothersewagetreatmentplantdesigntoprovideareference. Keywords:SewageTreatmentprocess,Trocessplan,Economicandtechnicalcomparison, Plandetermine硕士研究生学位报告 目次 I 目次 摘要I AbstractIV %-%1 1.1研究背景及目的意义 1 1.1.1课题所依托的实际工程 1 1.1.2研究背景1 1.1.3研究的目的意义 3 1.2城市污水处理技术及研究应用现状 3 1.2.1几种常用的污水处理工艺: 3 1.2.2我国城市污水处理技术应用现状 7 1.3研究内容及技术路线 7 1.3.1 7 1.3.2设计原则8 1.3.3技术路线8 第二章污水处理厂水质水量的分析与确定 11 2.1项目概况及自然条件 11 2.2供水量预测12 2.3污水量预测14 2.4设计进水水质14 2.5设计出水水质14 2.6工程规模确定15 2.7厂址论证15 第三章工艺方案分析与选择 17 3.1污水水质分析17 3.1.1污水可生化性分析 17 3.1.2水质指标分析 17 3.2污水处理工艺设计原则 17 3.3污水处理工艺选择 18 3.4工艺方案的技术经济比较 18 3.5深度水处理工艺选择 21 3.6消毒工艺选择25 3.7污泥处理工艺选择 26 3.8除臭工艺选择27II 目次 硕士研究生学位报告 第四章污水水厂总体设计方案 31 4.1污水处理工艺流程 31 4.2污水处理厂总体布局 31 4.2.1污水厂总平面布置 31 4.2.2高程设计31 4.3工艺设计31 4.4主要工程内容及设备 37 4.4.1主要工程内容 37 4.4.2主要工程设备 39 胃五章賤49 5.1^49 5.2建议50