Fenton与二氧化氯去除垃圾渗滤液中COD研究
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2020-04-09 14:17:14
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2019年第40卷第2期中北大学学报(自然科学版)Vol.40No.22019(总第184期)JOURNALOFNORTHUNIVERSITYOFCHINA(NATURALSCIENCEEDITION)(SumNo.184)文章编号:1673-3193(2019)02-0149-06Fenton与二氧化氯去除垃圾渗滤液中COD研究①王莹,晋日亚,贺增弟,乔怡娜,王琨(中北大学环境与安全工程学院,山西太原030051)摘要:垃圾渗滤液是一种成分复杂的高浓度有机废水,若不妥善处理,会对地下水、土壤及周围环境造成严重污染.采用Fenton法和ClO2氧化法处理垃圾渗滤液,考察了pH、药剂投加量及反应时间对COD去除率的影响,确定了最佳反应条件,并对两种方法进行了对比研究.实验结果表明:Fenton法的最佳条件为:pH=4,H2O2投加量为20mL/L,n(H2O2)∶n(Fe2+)=4∶1,反应时间为60min.ClO2氧化法的最佳条件为:ClO2投加量1000mg/L,反应20min.在最佳条件下,两种方法对渗滤液中COD去除率分别为70.18%,46.21%.Fenton法适合在pH=4的酸性环境,ClO2适合pH范围较广.ClO2法的成本较Fenton法略高,但Fenton法过程中产生的污泥需要进一步处理.关键词:垃圾渗滤液;Fenton;二氧化氯;COD去除率中图分类号:X703.1文献标识码:Adoi:10.3969/j.issn.1673-3193.2019.02.010StudyonRemovalofCODinLandfillLeachatebyUsingFentonandChlorineDioxideWANGYing,JINRi-ya,HEZeng-di,QIAOYi-na,WANGKun(SchoolofEnvironmentandSafetyEngineering,NorthUniversityofChina,Taiyuan030051,China)Abstract:Landfillleachateisakindofhighconcentrationorganicwastewaterwithcomplexcomposi-tions.Ifnotproperlytreated,itwillcauseseriouspollutiontogroundwater,soilandthesurroundingenvironment.FentonprocessandClO2oxidationprocesswereappliedtotreatinglandfillleachate,theeffectofpH,dosageandreactiontimeontheCODremovalinleachatewereinvestigated,theoptimalre-actionconditionsweredeterminedandthetwomethodswerecompared.TheexperimentalresultsshowthattheoptimumconditionsofFentonprocessareasfollows:pH=4,H2O2dosageis20mL/L,n(H2O2)∶n(Fe2+)=4∶1,andreactiontimeis60min.TheoptimumconditionsfortheoxidationofClO2areasfollows:thedosageofClO2is1000mg/L,andthereactiontimeis20min.Undertheopti-malconditions,theCODremovalratesofleachatebythetwomethodsare70.18%and46.21%,respec-tively.FentonmethodissuitableforacidicenvironmentswithpH=4,andClO2issuitableforawidepHrange.ThecostoftheClO2processisslightlyhigherthantheFentonprocess,butthesludgepro-ducedduringtheFentonprocessrequiresfurthertreatment.Keywords:landfillleachate;Fenton;ClO2;CODremovalrate渗滤液是垃圾填埋过程中由自然降水、垃圾自身所含水、微生物分解产生水以及由重力作用渗入的地表水和地下水等形成的[1-3].具有成分复杂,水质水量变化大,有机物及氨氮含量高,重金属离子种类多,营养元素比例失调等特点[4-6].若不经妥善处理,会渗入地下
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