陕西理工学院毕业设计生活污水脱氮除磷工程设计[摘要]某小区每天生活污水的最大排放量为28000t，污水水质为：BOD=130mg/L，COD=280mg/L，SS=280mg/L，TP=4.5mg/L，TN=30mg/L；根据进水水质特征及出水水质要求，拟采用CAST作为该小区生活污水脱氮除磷的工艺，其处理流程为：进水→中格栅→提升泵房→细格栅→平流沉砂池→CAST反应池→接触池→出水，污水经处理后达到GB18918-2002一级A标准，且整个处理自动化程度高，噪音小；经预算整个工程初期投资较低，运行成本0.41元/(m3污水)，适用于城市小区生活污水的处理，其设计过程可为类似污水处理厂设计提供借鉴和参考。[关键词]小区生活污水；CAST；脱氮除磷EngineeringdesignofdenitrificationandphosphorusremovalofsewageAbstract:Adistrictsewageofmaximumemissionsis28000teveryday,thedesignedwaterqualityforBOD,COD,SS,TPandTNis130mg/L,280mg/L,280mg/L,4.5mg/L,30mg/Lrespectively.Accordingtothecharactersofinfluentwaterqualityandeffluentwaterqualityrequirements,theproposedCASTcanbetakenasatechnologyofplotsewagedenitrificationandphosphorus.Theprocessisasfollows:wastewater→mediumgrille→boostpumproom→Finescreen→horizontalflowgritchamber→CASTreactionpool→contactchamber→waterpurification.ThesewageaftertreatmentreachGB18918-2002gradeAstandardandthewholedealwithahighdegreeofautomation,lownoise.Aftertheinitialinvestmentoftheproject,budgetislow,operationcostis0.41yuan/(m3)wastewater,itissuitableforurbanresidentialsewagetreatment,Thedesignprocesscanprovideareferenceforthesimilarwastewatertreatmentplantdesign.Keywords:Communitywastewater;CyclicActivatedSludgeSystem;Nitrogenandphosphorusremoval目录TOC\o"1-3"\h\uHYPERLINK\l"_Toc389568658"引言PAGEREF_Toc389568658\h1HYPERLINK\l"_Toc389568659"1设计任务及资料PAGEREF_Toc389568659\h1HYPERLINK\l"_Toc389568660"1.1设计原始资料PAGEREF_Toc389568660\h1HYPERLINK\l"_Toc389568661"1.1.1设计任务PAGEREF_Toc389568661\h1HYPERLINK\l"_Toc389568662"1.1.2水质情况PAGEREF_Toc389568662\h1HYPERLINK\l"_Toc389568663"1.2设计要求PAGEREF_Toc389568663\h1HYPERLINK\l"_Toc389568664"1.2.1污水处理厂设计原则PAGEREF_Toc389568664\h1HYPERLINK\l"_Toc389568665"1.2.2污水处理工程运行过程中应遵循的原则PAGEREF_Toc389568665\h2HYPERLINK\l"_Toc389568666"1.3环境条件状况PAGEREF_Toc389568666\h2HYPERLINK\l"_Toc389568667"1.4排水系统PAGEREF_Toc389568667\h2HYPERLINK\l"_Toc389