浆草造纸中段废水综合处理初步设计-学位论文.doc

河南城建学院毕业设计致谢45草浆造纸中段废水综合处理初步设计摘要制浆造纸中段废水主要包括:蒸煮污冷凝水、纸浆洗筛净化废水、漂白废水、碱回收废水及部分泄漏黑液；中段废水具有排放量大,污染负荷高,成分复杂,毒性大等特点；草浆造纸中段废水中主要污染物为植物纤维,污染物浓度高,而N、P含量偏低,可生化性很差,BOD5/COD值一般约为0.15～0.25,易产生泡沫,处理难度大；因此,草制浆造纸中段废水的处理已普遍受到政府和企业部门的高度重视。本设计是10万吨/d草浆造纸中段废水综合处理初步设计。进水水质为pH=4～9,COD≤3000mg/L,BOD5≤300～50mg/L0,ρ(SS)≤850mg/L,AOX≤20,色度≤1000times。2009年5月1日实行新标准造纸工业水污染物排放标准（GB3544－2008）规定pH=6～9，COD≤80mg/L，BOD5≤20mg/L，ρ(SS)≤30mg/L,AOX≤12，色度≤50times。这就使造纸废水“达标排放”迫在眉睫。采用物化预处理+生化处理+物化深度处理的方法处理该中段废水可使出水达标。通过分析原水水质水量，比较各处理工艺特点，本设计选用水解酸化+carrousel氧化沟+混凝沉淀三级处理工艺处理草浆造纸中段废水，可是出水排放达标。关键词：草浆造纸，中段废水，carrousel氧化沟，综合处理AbstractPulppapermakingwastewater:steamingpollutioncondensatepulpwashsievepurificationofwastewater,bleachingeffluent,recoverywastewater,andsomeleakageofblackliquor;middleofwastewateremissions,thepollutionload,complexcomposition,toxicity;majorpollutantsinthestrawandpaperinthemiddleofthewastewaterplantfiber,highconcentrationsofpollutants,whiletheN-lowPcontent,biodegradabilityispoor,theratioofBOD5/CODvalueisgenerallyabout0.15to0.25,easytoproducefoamprocessingdifficult;strawpulppapermakingwastewatertreatmenthasbeengenerallywellreceivedbythegovernmentandcorporatedepartmentsattachgreatimportance.Thedesignisthepreliminarydesignoftheintegratedtreatmentof100000t/dstrawofPaperMillWastewater.WaterqualityforpH=4~9,theCOD≤3000mg/L,BOD5≤300~500,ρ(SS)≤850mg/L,AOX≤20,thechroma≤1000times.May1,2009toimplementthenewstandardforthepaperindustrystandardsforwaterpollutants(inGB3544-2008)providespH=6~9ofCOD≤80mg/LandBOD5≤20mg/L,ρ(SS)≤30mg/L,ofAOX≤12,thechromaticity≤50times.Thismakespapermakingwastewaterdischargestandards"imminent.Materializedpretreatmentbiochemicaltreatmentmaterializeddepthofprocessingapproachtothemiddleofthewastewater,theeffluentcompliance.Throughtheanalysisofthewaterqualitycapacityofrawwater,comparethevariousdealwithprocesscharacteristics,ThisdesignselectshydrolysisthetheacidificationcarrouseloxidationditchcoagulationandsedimentationtertiarytreatmentcrafttoTREATMENTOFSTRAWPULPmidcoursewastewater,but