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I摘要水污染问题是我国最大的环境问题之一，水处理的发展对我国能否实现可持续发展起着举足轻重的作用。尤其是水资源的过度开发和不合理利用，导致水污染日益严重。因此，高效、合理、经济的污水处理工艺是解决这些问题的关键。本设计是山东济南某新区20000m3/d生活污水处理厂的初步设计。根据城市所处的地理位置和污水厂的规模，并结合脱氮除磷的要求，城市污水处理厂设计采用生物接触氧化工艺。生物接触氧化是采用生物膜水处理废水的一种方法,是以附着在载体（填料）上的生物膜，净化有机废水的一种高效水处理工艺。所选的生物接触氧化工艺具有工艺稳定性高，处理构筑物少，流程简化，节省投资等优点。通过此工艺的处理，出水水质将达到国家《城镇污水处理厂污染物排放标准》（GB18918-2002）中的一级B标准。关键词：生物接触氧化污水处理厂工艺流程IIAbstractOneoftheforemostEnvironmentalproblemsinourcountryiswaterpollution,especiallybecauseofover-exploitationofwaterresourcesandunreasonableuse,waterpollutionisincreaselyserious.So,efficient,rational,economicprocessofwastewatertreatmentplantisthekeytosolvetheseproblems.ThedesignisaintialdesignonsewagetreatmentplantsofanewtownshipJiNanofShandongprovince.Accordingtothelocationofthetownship,thesacleoftheplantandtherequirementsofnitrogenandphosphorusremoval,thecraftoftheplantisbio-contactoxidation.Bio-contactoxidationisakindofwastewatertreatmentmethodbyusingbiofilm,whichisahighlyefficientwastewatertreatmentprocessoforganicmaterialspurificationwiththebiomembraneattachedtothecarrier(commonlyknownasfillers).Selectedbio-contactoxidationprocesshassomeadvantages,suchashighprocessstability,lessstructure,processsimplificationandsavinginvestment.Throughthiscraftprocessing,theeffluentwillreachtheBstandardofnationalurbansewagetreatmentplantemissionstandards(GB18918-2002).Keywords:bio-contactoxidationSewagetreatmentplantProcessIII目录摘要............................................................................IAbstract.........................................................................II第1章设计概论..................................................................11.1设计依据和设计任务..........................................................11.1.1原始依据...............................................................11.1.2设计的基本要求.........................................................11.1.3设计原则...............................................................21.1.4设计依据...............................................................21.1.5设计目的...............................................................21.2设计水量...................................................................31.3设计水质...................................................................3第2章工艺流程的确定............................................................42.1设计方案及可行性分析........................................................42.1.1CASS工艺..............................................................52.1.2生物接触氧化工艺.......................................................62.1.3工艺比选...............................................................72.2工程实例...................................................................82.2.1CASS工程实例..........................................................82.2.2生物接触氧化工程实例...................................................92.3工艺流程...................................................................10第3章污水处理构筑物设计计算...................................................113.1粗格栅....................................................................113.1.1设计说明..............................................................113.1.2设计参数..............................................................113.1.3设计计算..............................................................123.2提升泵房..................................................................153.2.1设计说明..............................................................153.2.2设计参数..............................................................15IV3.2.3设计计算..............................................................153.3细格栅.....................................................................163.3.1设计参数..............................................................163.3.2设计计算..............................................................173.4平流沉砂池................................................................193.4.1设计说明..............................................................193.4.2设计参数..............................................................193.5水解酸化池.................................................................233.5.1设计参数..............................................................233.5.2池体计算..............................................................233.5.3配水系统..............................................................243.6配水井....................................................................263.6.1设计说明..............................................................263.6.2设计要求..............................................................263.6.3设计计算..............................................................273.7生物接触氧化池............................................................283.8二沉池....................................................................383.8.1已知条件..............................................................383.8.2设计参数..............................................................383.8.3设计计算..............................................................393.9消毒池....................................................................443.9.1