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西北地区某城市二级污水处理厂设计.doc西北地区某城市二级污水处理厂设计.doc -- 6 元

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毕业设计说明书摘要本设计题目为西北地区某城市二级污水处理厂设计该工程所处理的污水主要是由城市工业废水和公共建筑用水以及城市生活用水组成。其混合污水最大日设计流量为Q39715米3/d,日变化系数K1.1,总变化系数为K1.4,其中城市设计人口15万人,城市公共建筑污水按城市污水的30计,工业污水量为1.3万米3/d,设计水质经环保部门监测,污废水主要污染物COD、SS、BOD、TP、TN以及重金属和有毒物质少量,其污水水质如下COD455mg/l,SS245mg/l,BOD5220mg/l,PH78,冬季平均温度8。C,夏季平均温度为29。C,处理厂处理水质为BOD5≦20mg/l,CODcr≦100mg/l,SS≦20mg/l,NH3N≦15mg/l,TP≦1.0mg/l,出水水质符合国家的二级排放标准。本设计中,采用DE型氧化沟处理该城市污水。处理构筑物主要有平流沉砂池、DE型氧化沟、二沉池等,其主要构筑物DE型氧化沟系统是在DE型氧化沟基础上发展起来的,有2个平行的氧化沟和一个独立的沉淀池组成,处理程度大大提高,该系统可进行硝化,反硝化反应,从而达到生物脱氮的功能,在其系统前增设厌氧池则可达到除磷的目的。该系统具有高效,节能的特点,且耐冲击负荷高,出水水质好。毕业设计说明书ABSTRACTThedesignisthe2areacertaincityleveldesignsofNothchinaofsewagetreatmentplanttomakeasummanytodesigntitle.Thedirtyabandonwaterofthisprojectlocatedreasonisformedmianlybycityindustrialeffluentandcitypublicbuildingsewageaswellascitysewage.Itmixsewagebiggestdayrateddischageis3.9715metre3/day.DaychangecoefficientKday1nad2,changealwayscoeffcietKtotal1and4.Inwhichcitydesignpopulationfiftinghundredsthousabdsperson.Citypublicbuildingsewageismeasuredaccordingtotheideaof30thatcitysewageismonitoredbythedepartmentofenvironmentprotection.Indirtyuselesswater,majorcontanmintisCODcr,SS,BOD5,TP,TN,aswellasheavymetalwithisanalysed.ItisdirtyuselsswaterqualityisasfollowCOD455mg/l,SS245mg/l,BOD220mg/l,PH78.Inthisdesign,withtheoxidizedithhandingofDEmodel.ItshouldbedirtywaterItistheoxidizeaerationpotandbiologicalchooserofDEmodelmaintohandletobuildingthis,isdisgusted,oxygenpoolandholetype.毕业设计说明书目录第1章概述.......................................................................................................................11.1设计依据及设计任务............................................................................................11.1.1设计题目.....................................................................................................11.1.2设计依据.....................................................................................................11.2设计水量................................................................................................................31.2.1污水来源及状况........................................................................................31.2.2污水量计算.................................................................................................31.3设计人口与当量人口............................................................................................41.3.1一级处理以主要去除SS为主...............................................................51.3.2二级处理以主要去除BOD5为主..........................................................51.4处理程度................................................................................................................51.4.1进水水质.....................................................................................................51.4.2去除率.........................................................................................................51.4.3PH值.........................................................................................................61.4.4重金属及有毒物质.....................................................................................6第2章城市污水处理方案的确定.....................................................................................62.1确定污水处理方案的原则....................................................................................62.2污水处理方案的确定............................................................................................72.2.1处理标准的确定.........................................................................................72.2.2污水处理路线的选择.................................................................................72.3污水处理工艺流程方案介绍................................................................................92.3.1传统活性污泥法.........................................................................................92.3.2A/O脱氮工艺.............................................................................................102.3.3A/O与VIP组合工艺................................................................................112.3.4AB两段曝气法.........................................................................................122.3.5A2/O工艺...................................................................................................132.3.6改良型A2/O工艺.....................................................................................14毕业设计说明书2.3.7其工艺流程如下...................................................................................152.4工艺流程的确定..................................................................................................172.5主要构筑物的选择..............................................................................................172.5.1格栅...........................................................................................................172.5.2进水闸井...................................................................................................172.5.3污水泵房...................................................................................................172.5.4沉砂池.......................................................................................................182.5.5沉淀池(二沉池)...................................................................................192.5.6氧化沟.......................................................................................................212.5.7消毒...........................................................................................................212.5.8浓缩池.......................................................................................................212.5.9污泥脱水...................................................................................................22第3章城市污水处理系统的设计...................................................................................223.1进水闸井和进水格栅间的设计..........................................................................223.1.1污水厂进水管...........................................................................................223.1.2进水闸井工艺设计...................................................................................223.1.3格栅的设计...............................................................................................243.2污水泵房的设计..................................................................................................283.2.1一般规定...................................................................................................283.2.2选泵...........................................................................................................283.2.3吸、压水管路实际水头损失的计算.......................................................303.2.4集水池.......................................................................................................323.2.5水泵机组基础的确定和污水泵站的布置...............................................323.2.6泵房高度的确定.......................................................................................333.2.7泵房附属设施及尺寸的确定...................................................................343.2.8采光、采暖与通风...................................................................................353.2.9起吊设备...................................................................................................353.2.10泵房值班室、控制室及配电间.............................................................35毕业设计说明书3.2.11门窗及走廊、楼梯..................................................................................363.3平流式沉砂池的设计..........................................................................................373.3.1设计要求...................................................................................................373.3.2设计参数...................................................................................................383.3.3设计计算...................................................................................................383.4生物选择器厌氧池的设计..........................................................................403.4.1生物选择池(厌氧混合池)容积计算...................................................403.4.2搅拌设备的选择.......................................................................................413.5氧化沟的设计......................................................................................................413.5.1夏季状况...............................................................................................413.5.2冬季状况...............................................................................................423.6二沉池的设计......................................................................................................433.6.1设计要求...................................................................................................433.6.2设计参数...................................................................................................433.6.3设计计算...................................................................................................443.6.4刮泥设备的选择.......................................................................................483.7接触消毒..............................................................................................................493.7.1设计依据...................................................................................................493.7.2设计计算...................................................................................................493.7计量设施..............................................................................................................513.7.1计量设备的选择.......................................................................................513.7.2设计依据...................................................................................................523.7.3设计计算...................................................................................................52第4章污泥处理工艺的设计...........................................................................................534.1浓缩池的设计......................................................................................................534.1.1设计要求...................................................................................................534.1.2设计参数....................................................................................................544.1.3设计计算....................................................................................................54毕业设计说明书4.2均质池..................................................................................................................564.3污泥控制室...........................................................................................................564.3.1污泥提升泵...............................................................................................564.3.2搅拌器.......................................................................................................564.3.3污泥控制室的布置...................................................................................564.4污泥脱水机房......................................................................................................574.4.1机械脱水...................................................................................................574.4.2设计计算...................................................................................................57第5章污水回用系统的设计...........................................................................................585.1混凝反应的设计..................................................................................................585.1.1深度处理的对象与目标.......................................................................585.1.2混凝剂的溶解和配置...............................................................................595.1.3混凝剂的选择.......................................................................................595.1.4设计计算...............................................................................................595.2反应池的设计.......................................................................................................605.2.1设计要点...................................................................................................605.2.2设计计算...................................................................................................605.3沉淀池的设计......................................................................................................625.3.1设计要点...................................................................................................625.3.2设计参数...................................................................................................635.3.3设计计算...................................................................................................635.4滤池的设计..........................................................................................................645.4.1设计参数...................................................................................................655.4.2设计计算...................................................................................................655.5中水池的设计......................................................................................................685.5.1中水池容积计算...................................................................................685.5.2消毒...........................................................................................................68第6章污水厂总体布置...............................................................................................70毕业设计说明书6.1平面布置及总平面图..........................................................................................706.1.1平面布置的一般原则...........................................................................706.1.2厂区平面布置形式.................................................................................706.1.3污水厂平面布置的具体内容...................................................................716.2.1污水处理厂高程布置应考虑事项...............................................................71第7章供电仪表与供热系统设计............................................................................737.1变配电系统..........................................................................................................737.2监测仪表的设计..................................................................................................747.2.1设计原则...................................................................................................747.2.2检测内容...................................................................................................74第8章劳动定员...........................................................................................................748.1定员原则..............................................................................................................748.2污水厂人数定员..................................................................................................75第9章工程的概预算及其运行管理...........................................................................759.1工程概算..............................................................................................................759.1.1水量造价...............................................................................................759.1.2总投资...................................................................................................759.2安全措施..............................................................................................................759.2.1安全措施...................................................................................................759.2.2污水厂运行中注意事项............................................................................76
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