毕业设计-青岛城阳污水处理厂设计

I摘要A2/O法是流程最简单，应用最广泛的脱氮除磷工艺。污水首先进入厌氧池，兼性厌氧菌将污水中的易降解有机物转化成VFAs。回流污泥带入的聚磷菌将体内的聚磷分解，此为释磷，所释放的能量一部分可供好氧的聚磷菌在厌氧环境下维持生存，另一部分供聚磷菌主动吸收VFAs，并在体内储存PHB。进入缺氧区，反硝化细菌就利用混合液回流带入的硝酸盐及进水中的有机物进行反硝化脱氮，接着进入好氧区，聚磷菌除了吸收利用污水中残留的易降解BOD外，主要分解体内储存的PHB产生能量供自身生长繁殖，并主动吸收环境中的溶解磷，此为吸磷，以聚磷的形式在体内储存。污水经厌氧，缺氧区，有机物分别被聚磷菌和反硝化细菌利用后浓度已很低，有利于自养的硝化菌的生长繁殖。最后，混合液进入沉淀池，进行泥水分离，上清液作为处理水排放，沉淀污泥的一部分回流厌氧池，另一部分作为剩余污泥排放。本工艺在系统上可以称为最简单的同步脱氮除磷工艺，总的水力停留时间少于其他同类工艺。而且在厌氧-缺氧-好养交替运行条件下，不易发生污泥膨胀。关键词：厌氧池，缺氧池，好氧池，脱氮除磷，A2/O，有机负荷AbstractIIAbstractA2/Omethodisthemostsimpleprocess,oneofthemostwidelyappliedtotakeoffthenitrogenphosphorusremovalprocess.FirstYanYangChiintowastewater,sewageoffacultativeanaerobicbacteriaofeasilydegradableorganicsintoVFAs.Backflowsludgeintothephosphorusenrichmentbacteriabodyphosphorusenrichmentdecompose,thisforreleasephosphorus,thereleaseofenergyforthepartofaerobicbacteriaphosphorusenrichmentinanaerobicenvironmentsurvive,theotherpartofphosphorusenrichmentbacteriaforactiveabsorptionVFAs,andinstoreinsidebodyPHB.Oxygenintothearea,denitrifyingbacteriabyusingthemixtureofnitrateandwaterintothebackflowoforganicmatterfordenitrificationdenitrification,thenintogoodoxygenarea,phosphorusenrichmentbacteriainadditiontoabsorbingsewageresidualofeasilydegradableBODoutside,maindecompositionofthestoreinsidebodyproducesenergyPHBgrowforitself,andthedissolutionofactiveabsorptionconditionsofphosphorus,thisispuptake,intheformofphosphorusenrichmentinstoreinsidebody.Thesewageisanaerobic,lackofoxygenarea,organicmatterwerephosphorusenrichmentbacteriaanddenitrifyingbacteriausingtheconcentrationislow,whichishelpfulforthedenitrifyingbacteriagrowthautotrophicbreeding.Finally,themixtureintothesedimentbasins,spateseparation,clearliquidwatertreatmentonasemissions,partofthesludgeprecipitationbackflowYanYangChi,anotherpartasexcesssludgeemissions.Thisprocessinthesystemthemostsimplesynchronizationcanbecalledoffnitrogenphosphorusremovalprocess,andthehydraulicretentiontimelessthanothersimilartechnology.Andinanaerobic-lackofoxygen-goodraisedalternateoperationconditions,notcausesludgeinflation.Keywords:,YanYangChi,hypoxiapool,Aerobicpool,denitrificationandphosphorus,A2/O,organicload目录III目录摘要..................................................................................................IAbstract..............................................................................................II目录...................................................................................................Ⅲ第一章引言.....................................................................................11.1课题的背景...............................................................................................11.2设计依据...................................................................................................21.3工程概况....................................................................................................21.3.1设计水量...........................................................................................21.3.2设计水质...........................................................................................21.3.3其他资料...........................................................................................31.4城市污水的概述.......................................................................................31.4.1城市污水的来源...............................................................................31.4.2城市污水的特点...............................................................................3第二章工艺设计方案的确定..................................................................42.1污水处理工艺选择原则...........................................................................42.2工艺设计方案对比...................................................................................42.2.1稳定塘工艺.......................................................................................52.2.2传统活性污泥法...............................................................................52.2.3AB法..................................................................................................62.2.4A2/O法..............................................................................................62.2.5氧化沟工艺.......................................................................................62.2.6厌氧生物处理工艺...........................................................................72.2.7SBR法................................................................................................82.3污水处理工艺流程的确定.......................................................................92.3.1工艺流程介绍...................................................................................92.3.2可行性分析.....................................................................................10第三章构筑物的设计计算....................................................................113.1格栅的设计计算.....................................................................................113.1.1设计说明.........................................................................................113.1.2设计计算............................