混凝沉淀_吹脱_Fenton氧化_省略_预处理垃圾渗滤液膜滤浓缩液的研究_万小娇
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2020-06-30 22:57:13
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混凝沉淀-吹脱-Fenton氧化协同预处理垃圾渗滤液膜滤浓缩液的研究万小娇,柴晓利,牛静,赵由才*(同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092)摘要[目的]研究化学混凝沉淀-吹脱-Fenton氧化法对垃圾渗滤液膜滤浓缩液的处理效果。[方法]以上海某填埋场生活垃圾渗滤液膜滤浓缩液为研究对象,研究混凝沉淀-吹脱-Fenton氧化协同处理工艺对有机物和NH3-N的去除,考察混凝剂种类、投加量、吹脱温度、空气流量、吹脱pH和H2O2浓度、Fe2+浓度、氧化pH和时间等因素的影响。[结果]混凝沉淀中,添加6g/LMgO和2g/LCa(OH)2混凝沉淀效果最佳。最佳吹脱试验条件确定为pH11.0~11.5,温度≥30℃,吹脱时间为4.5~5.0h,空气流量为6L/(min·L),吹脱效率大于80%。Fenton氧化的最优化条件为H2O2750mmol/L,Fe2+28mmol/L,反应时间45min,pH3。整个工艺对COD去除率达93.4%,对NH3-N去除率达95.7%。[结论]化学混凝沉淀-吹脱-Fenton氧化法对垃圾渗滤液膜滤浓缩液的处理效果较好,值得进一步研究。关键词混凝;吹脱;Fenton氧化;垃圾渗滤液膜滤浓缩液中图分类号X714文献标识码A文章编号0517-6611(2011)31-19325-03TreatmentofConcentratedLeachatefromROSystemUsingCoagulation,AmmoniaStrippingandFentonOxidationProcessesWANXiao-jiaoetal(StateKeyLaboratoryofPollutionControlandResourceReuse,CollegeofEnvironmentalScienceandEngineering,TongjiUniversity,Shanghai200092)Abstract[Objective]Theresearchaimedtostudythecontrolofconcentratedleachatewithmethodofcoagulation,ammoniastrippingandFentonoxidationprocesses.[Method]Atreatmentprocessfortheconcentratedlandfillleachatefromareverseosmosisequipmentusingcoagu-lation,ammoniastrippingandFentonoxidationwasdeveloped.Theeffectsofthecompositecoagulants,ammoniastrippingtemperature,pH,quantityofflowair,H2O2andFe2+concentrationsonCODandNH3-Nremovalswereinvestigated.[Result]Theresultsshowedthattheopti-mumefficiencyofcoagulationandammoniastrippingcouldbeachievedundertheprofilesof6g/LMgOand2g/LCa(OH)2byagitatingfor24hfollowedbyblowingairatthespeedof6L/(min·L)for4.5-5.0hatpHof11.0-11.5.TheoptimisticconditionsoforthogonaltestswereH2O2concentration750mmol/L,Fe2+concentration28mmol/L,reactiontime45min,pH3.CODandNH3-Nremovalrateswere93.4%and95.7%throughthewholeprocess.[Conclusion]Thisresearchindicatedthatthecontrolofconcentratedleachatewithmethodofcoagulation,ammoniastrippingandFentonoxidationprocesseswasidealandshouldbestudiedfornextstep.KeywordsCoagulation;Ammoniastripping;Fentonoxidation;Concentratedleachate基金项目上海市科委2010年重大专项子课题(10DZ1200109)。作者简介万小娇(1987-),女,江苏连云港人,硕士研究生,研究方向:固体废弃物处置和资源
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