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ID:36851956
大小:3.00 MB
页数:64页
时间:2019-05-16
《膨润土预处理城市垃圾渗滤液研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要卫生填埋是我国目前处理垃圾的主要方法,其产生的垃圾渗滤液对环境危害很大。垃圾渗滤液水质复杂,具有高COD浓度、高金属离子和高氨氮含量的特点,且污染物浓度变化大。目前国内外的垃圾渗滤液处理工艺,总体上采用以生物处理为主体工艺,物化法作为预处理工艺,土地法作为后处理工艺的系统。本实验采用矿产资源丰富、价格低廉的膨润土作为吸附剂预处理城市生活垃圾渗滤液,是对渗滤液预处理法的重要补充。通过实验研究表明,膨润土预处理渗滤液方法是可行的,钠基膨润土是较优的处理药剂。影响膨润土对垃圾渗滤液吸附工艺中的主要参数为:膨润土的投加量、水利条件、渗滤液的pH值及静沉时间。钠基膨润土吸附最佳反应条件
2、如下:pH值7.0,投加为159/L,水利条件250r/min(3min),静沉1h。在该混凝条件下,渗滤液SS去除率为74.2%,COD盯的去除效果为45.3%,氨氮的去除率为39.5%。根据试验结果结合机理分析得出,膨润土对渗滤液中污染物质的吸附主要有物理吸附和化学吸附,其中以物理吸附为主,同时存在着深度效应和筛分作用。关键词:渗滤液、膨润土、混凝、吸附AbstractSanitarylandfillisthemainprocessofthemunicipalrefusetreatment,anditwillproducelandfillleachatethatisveryh
3、armfulfortheenvironment.Thelandfillleachateisacomplexwastewaterwithconsiderablevariationsincomposition,andllighconcentrationofCOD、heavymetalionandammonia—nitrogen.Pollutantconcentrationofthelandfillleachateusedtochangelargely.Currently,alloftheprocessingcraftindomesticandforeignaredividedinto
4、threesegments;thebiologicaltreatmentistakenasthemainbodycraft,thephysical—chemicaltreatmentandlandmethodaretakenasthepretreatmentcraftandthepost-processingcraft,respectively.Theexperimentaluseofmineralresource—rich,lowpricesofbentoniteasabsorbentpretreatmentmunicipalleachate,itisallimportants
5、upplementtothepretreatmentleachate.Throughtheexperimentalstudyshowedthatthemethodologywhichthepretreatmentleachateusingbentoniteisfeasible,andsodiumbentoniteisbetterastreatmentPharmacy.Themainparameters,whichaffecttheabsorbingprocess,includingbentonitedosage,solutionpH,adsorptiontimeandStatic
6、—time,etc.Sodiumbentoniteadsorptionoptimumconditionsareasfollows:pHvalueof7.0,addingto15g/L,waterconditions250r/min(3min),Static—time1hour.Inthecoagulationconditions,theleachateSSremovalrateis74.2percent,CODertheremovalrateis45.3percent,ammonianitrogenremovalrateis39.5percent.Basedonthetestre
7、sultsofthatanalysisofthemechanism,theleachatebentoniteintheabsorptionofpollutantsTheadsorbmechanismincludephy7sicalandchemicaladsorption,theformeristhemainadsorption,andincludedepthfiltrationandmolecularsievingpropertiesaswell.Keywords:leacha
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