摘要随着城市化和工业化进程的加快，生活污水污染日趋严重，制约了社会经济的可持续发展。本文主要对某小型城市生活污水中的COD、BOD、SS进行处理设计。目前，其处理方法有很多，主要有物化处理、化学处理、生化处理以及多种方法的组合处理等，各种处理方法具有各自的优势及不足，本文较详细的介绍了常见的几种生化处理工艺，比较他们各自的优缺点，并根据该项目的实际情况选择合适的处理工艺。最终选择CASS工艺来处理该城市生活污水，并对其工艺和主要设备进行了设计。处理后，达到国家污水综合排放一级B标准。关键词:城市生活污水污水处理工艺CASS曝气沉砂池BODAbstractWiththeaccelerationoftheprocessofurbanizationandindustrialization,sewagepollutionisworsening,theconstraintsofsustainablesocio-economicdevelopment.Inthispaper,asmallurbansewageofCOD,BOD,SSprocessingdesign.Atpresent,therearemanytreatmentmethods,themainphysico-chemicaltreatment,chemicaltreatment,biologicaltreatment,aswellasacombinationoftreatmentofavarietyofmethods,variousapproacheshavetheirrespectiveadvantagesandshortcomings,thispapermoredetaileddescriptionofseveralcommonbiochemicalprocessingprocesstocomparetheirrespectiveadvantagesanddisadvantages,andinaccordancewiththeactualsituationoftheprojecttoselecttheappropriatetreatmentprocess.FinalchoiceoftheCASSprocesstohandlethesewageofthecity,anditsprocessandequipmentdesign.TreatmenttoachieveaBstandardofthenationalwastewaterdischarge.Keywords:UrbansewageWastewatertreatmentprocessCASSAeratedGritBOD目录摘要.........................................................................................................................................IAbstract....................................................................................................................................I一、绪论..............................................................................................................................-1-1.1水环境........................................................................................................................-1-1.2水资源概述................................................................................................................-1-1.3水资源的重要性........................................................................................................-2-1.4城市生活污水的特点................................................................................................-3-1.3污水处理现状............................................................................................................-3-1.3.1国外污水处理现状........................................................................................-4-1.3.2国内污水处理现状............................................................................................-5-二、处理方案的确定..........................................................................................................-6-2.1污水工艺简介............................................................................................................-6-2.2处理工艺的优选........................................................................................................-8-2.2.1常规活性污泥法和氧化沟、SBR工艺的比较...................................................-8-2.2.2氧化沟、SBR工艺的比较...................................................................................-8-2.2.3最终工艺的确定................................................................
