畜禽养殖废水污水处理站的设计

I畜禽养殖废水污水处理站的设计摘要:畜禽养殖废水是一类高浓度的有机废水，主要来源于畜禽的粪尿和冲洗废水。废水中含有重金属、残留的兽药和大量的病原体等污染物，如不经过处理就排放于环境或直接农用，会对当地的生态环境和农田以及周围环境的水质造成较为严重的污染。本设计畜禽养殖废水污水处理站的日处理量为1003md，进水的BOD5为1200mg/L，COD为2000mg/L，废水的可生化性好；处理后出水的BOD5为41mg/L，COD为87mg/L。本次设计采用预处理→水解酸化→生物接触氧化处理工艺，水解酸化阶段可将大分子物质水解为小分子物质，减小后续生化处理阶段的有机物负荷，水解酸化阶段BOD5的去除率是42.3％，COD是45.7％；生物接触氧化阶段BOD5的去除率是85％，COD是80％。经该工艺处理后的出水可以达到《中华人民共和国规模畜禽养殖业行业标准》。本处理站占地面积为44962m，总投资为91.6万元,运行成本为2.69元/3m。关键词：畜禽养殖废水；生物接触氧化；有机废水；水解酸化IITheDesignofSewageTreatmentStationofLivestockWastewaterAbstract:Livestockwastewaterisahighconcentrationoforganicwastewater,mainlyderivedfromanimals’wasteandthewastewaterbywashing.Thewastewatercontainsmangpollutants,suchasheavymetals,residuesofveterinarydrugsandlargenumbersofpathogensandsoon,Ifletingitouttotheenvironmentordirectingtothefarm-orientedwithoutbingtreated,itwilleadmoreseriouswaterpollutiontothelocalecologicalenvironment,thesurroundingfarmlandandthewaterqualityofthesurroundingenvironment.Thedailyhandlingcapacityofthedesignofsewagetreatmentstationoflivestockwastewateris1003md,BOD5is1200mg/LandCODcris2000mg/Lofinfluentwater,andthebiodegradabilityofwastewaterisgood.Bytheprocess,BOD5is41mg/LandCODcris87mg/Lineffluentwater.Thisdesignadoptsthetechonlogyinthefollowing:pretreatment→hydrolyzationacidification→biologicalcontactoxidation,onthestageofhydrolyzationacidificationtheremovalofBOD5is42.3%,CODcris45.7%;onthestageofbiologicalcontactoxidationtheremovalofBOD5is85%,CODcris80%.Andonthestageofacidhydrolysismacromolecularmaterialcanbehydrolyzedtosmallmolecules,decreasingtheorganicloadofbiochemicaltreatmentoffollow-upphase,achievingthebettereffectofthebiochemical.TreatedwatermayachievethePRC-scaleanimalhusbandryindustrystandards.Thestation’sfootprintis44962m,thetotalinvestmentis916.000yuan,theoperatingcostis2.69yuan/3m.Keywords:livestockwastewater,biologicalcontactoxidation,xidationoforganicwastewater,hydrolyzationacidificationIII目录前言...................................................................................................................................1第1章总论....................................................................................................................21.1畜禽养殖业废水概述.............................................................................................21.2畜禽养殖废水水质特性分析.................................................................................21.3畜禽养殖废水对环境的影响及治理现状.............................................................21.3.1畜禽养殖废水对环境的影响.......................................................................21.3.2畜禽养殖废水治理现状...............................................................................3第2章设计任务说明......................................................................................................62.1设计依据..................................................................................................................62.2设计原则..................................................................................................................62.3设计范围和规模......................................................................................................72.3.1设计范围........................................................................................................72.3.2设计规模........................................................................................................72.4设计进出水水质和基础资料.................................................................................72.4.1设计进出水水质............................................................................................72.4.2设计基础资料...............................................................................................7第3章污水处理工艺的比选及说明..............................................................................83.1工艺流程的选择.....................................................................................................83.2工艺的比选.............................................................................................................83.2.1初沉池...........................................................................................................83.2.2厌氧生物处理...............................................................................................93.2.3好氧生物处理.............................................................................................103.3工艺流程图及说明...............................................................................................123.3.1工艺流程图.................................................................................................123.3.2工艺说明.....................................................................................................133.4各个构筑物对BOD5、CODcr的去除率.............................................................15第4章构筑物的设计计算.............................................................................................164.1网筛和格栅渠.......................................................................................................164.1.1网筛...................................................................