[毕业设计精品]酚醛树脂废水来源及水质特性

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1、摘要酚醛树脂是由酚类(如苯酚、甲酚、二甲酚和壬酚等)和醛类(如甲醛、乙醛和糖醛等)在酸或碱的催化作用下合成的,其生产过程中排出的废水含有较高浓度的酚类、醛类,并且还含有大量醇类、酸类等有毒物,处理难度大。高浓度含酚醛废水需采用萃取、化学氧化、吸附、缩合等预处理降低有毒有害物的毒性和浓度后才可生化处理。本试验所处理的废水为焦作市某胶粘剂厂生产改性酚醛树脂的生产废水，生产中排放2t/d左右的废水。实验中采用碱性缩合正交试验，其中缩合分“一步缩合”试验和“两步缩合”试验。通过寻求正交实验影响因素以及各因素反应的水平值，最终确定为四因素三水平正交，共做9组实验。实验测

2、定水样以及缩合后水样COD值、甲醛浓度、挥发酚浓度、PH值等各项指标。“两步缩合”试验只进行了第一步的反应，COD的去除率能达到41.2％，甲醛的去除率保持在30-40％之间，挥发酚的去除率在40-60％之间。.通过对比“一步缩合”和“两步缩合”试验的预处理效果，得出“一步缩合”试验对COD、甲醛、挥发酚的去除效果更加明显，因此在后期的实验中选择“一步反应”对甲醛和酚的后续处理。关键词：酚醛树脂废水碱性缩合甲醛挥发酚26AbstractThephenolicresinisaphenol(suchasphenol,cresol,xylenol,andnonylp

3、henol,etc.)andaldehydes(suchasformaldehyde,acetaldehydeandfurfural,etc.)inacidoralkalinecatalystsynthesis,anditsproductionProcesswastewatercontaininghighconcentrationsofphenols,aldehydes,andalsocontainslargeamountsofalcohols,acidsandothertoxicsubstances,treatmentisdifficult.Phenolic

4、wastewatercontaininghighconcentrationrequirestheuseofextraction,chemicaloxidation,adsorption,condensationpreconditioningdecreasethetoxicityoftoxicandhazardouscompounds,andonlyaftertheconcentrationofbiologicaltreatment.ThetrialsforthetreatmentofwastewaterplantinJiaozuoCity,amodifiedp

5、henolicresinadhesiveproductionofwastewater,theproductionofemissions2t/dorsoofwastewater.Experiment,alkalinecondensationexperiment,inwhichthecondensationpoint"onestepcondensationreaction"and"two-stepcondensationreaction."Orthogonalfactorsbylookingforandvalueofeachfactorlevelofrespons

6、e,andultimatelydeterminethelevelofthefourfactorsandthreeorthogonal,atotalof9groupstodoexperiments.WatersampleandtestwatersamplesaftertheCODvalueofthecondensation,theconcentrationofformaldehyde,phenolconcentration,PHvalueandotherindicators."two-stepcondensation"Weonlygotthefirststepo

7、fthereaction,CODremovalrateisnotveryhigh,thehighestis41.2%,removalrateofformaldehydeat30-40%,andphenolremovalBetween40-60%..Bycontrast,after"onestepcondensationreaction"and"two-stepcondensationreaction"thepre-effect,cometo"stepcondensationreaction"tothemoreobvioustheremovalofthethre

8、eindexes,soinlatere