60000吨城市生活污水处理厂（AAO工艺）毕业设计.docVIP

设计总说明

我国水体污染主要来自两方面，一是工业发展超标排放工业废水，二是城市化中由于城市污水排放和集中处理设施严重缺乏，大量生活污水未经处理直接进入水体造成环境污染。工业废水近年来经过治理虽有所减少，但城市生活污水有增无减，占水质污

染的51%以上。

本设计要求处理水量为60000m3/d的城市生活污水，设计方案针对已运行稳定有效的A2/O活性污泥法工艺处理城市生活污水。A2O工艺由于不同环境条件，不同功能的微生物群落的有机配合，加之厌氧、缺氧条件下，部分不可生物降解的有机物(COD)能被开环或断链，使得N、P、有机碳被同时去除，并提高对COD的去除效果。它可以同时完成有机物的去除，硝化脱氮、磷的过量摄取而被去除等功能，脱氮的前提是NH?--N应完全硝化，好氧池能完成这一功能，缺氧池则完成脱氮功能。厌氧池和好氧池

联合完成除磷功能。

关键词：城市生活污水、传统活性污泥法、A2/O

GeneralDesignDirection

SewageinChinaismainlycomefromtwoaspect:theindustrialsewageandthemunicipal.,theaquicolousenvironmentwaspollutedduetoplentyofrawwastewater

dischargeintotheriver.

Thisisadesignaboutthesewagetreatmentplant.Accordingtotheprimitivedataofthegraduationprojectanddemandingforwaterquality:Namelyrequirethedenitrification

andphosphorusremovaltoreachthesecondclassdischargestandard.A2/Ocraftischose

Inpreliminarytreatment,theoriginalwaterenterscoarsescreeninginordertoremoveheavysolidesandfloatablematerial,incasethatitinfluencestheworkingofthefollowingtreatmentandthepipeline.Andthenwastewaterispromotedintothemediumscreeningbypump.afterthatitentersthelaminarflowsandpool,itisusedtoremovebiggerinorganicsandofheavydensity,bythisway,thedensityoforganicmaterialinmudcanbeimproved.Theabove-mentionedsewagedisposalisthephysicaldisposalstage,itssametothetwomajorcraft.Nowmakeabriefinstructionoftheiologicaldisposalpartsofthesetwomajorcraftsseparately.Afterfinishingcalculationofdesign,accordingtoprincipleoflaying,considerthefactorssyntheticallytoconfirmtheplaceofthesewagefactory.Accordingtoflowvolumeofsewagewecanselectthefoot-path,confirmthevelocityofflowandwater

conservancyslope,thencalculatewaterconservancylosses.

Keyword:A2/OMunici[palSewageTreatmentSlud