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ID:37225337
大小:2.64 MB
页数:64页
时间:2019-05-19
《强电场再生离子交换法资源化处理含Cr(Ⅵ)废水》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、浙江大学硕士学位论文摘要摘要构建了一种全新的离子交换法一强电场再生离子交换法,用于处理低浓度含Cr(VI)废水。该法具有净化效率高、无需耗用化学再生剂、再生迅速、装置简单等优点,还能与其他方法联用实现CrⅣI)回收,具有潜在应用价值。研究工作主要包括三部分:树脂选择,再生工艺参数影响及再生液浓缩。研究结果表明,采用强电场对失效树脂进行再生基本可行。弱碱性大孔型树脂D301最适合于强电场再生离子交换系统,该树脂不仅吸附容量大,而且再生效果好,再生能耗低。合适的强电场再生条件为:恒流1.5A(电流密度375脯),迸水温度10℃,流量1.2L/h(水力停留时间2.4m
2、in),再生时间2h。在此条件下,再生液平均浓度达724mg/L,浓缩倍数约14.5倍,树脂再生率为44%,能耗为8.44kWh/molCr(VI)。再生后的树脂可有效地净化含Cr(VI)废水,Cr(VI)浓度可从初始的50mg/L降至O.5mg/L以下。强电场再生离子交换和电渗析联用,能将再生液进一步浓缩至14.55g/L,能耗仅增加0.86kWh/molCr(VI),系统总能耗为9.3kWh/molCr(VI)。关键词:Cr(VI)、离子交换、电渗析(ED)、电再生、绿色再生、强电场、铬酸、回收浙江人学硕士学位论文AbstractAnovelionexcha
3、ngesystemregeneratedusingastrongelectricalfieldwasproposedandinvestigatedfortheremovalandrecoveryofCr(VI)fromwastewater.Itmayfinditswideindustrialapplicationsduetoitshighpurificationefficiency,goodheavymetalsrecoverywithoutchemicalsconsumption,quickregeneration,andsimplestructure.Res
4、earchworkfocusedmainlyontheresinslection,theoperationalvariableeffects,andtheCr(VI)recovery.Experimentalresultsshowedthatitisfeasibletoregenerateresinsusingastrongelectricalfield.Themacro—porousweak-base(D301)resinWaschosenforthenovelionexchangesystembecauseofitssatisfactoryefficacyf
5、orCr(VI)removalandrecovery,withlowpowerconsumptionrequired.Theoptimaloperationalconditionsfortheregenerationwere:aD1watertemperatureof10℃,aflowrateof1.2L/h(aHRTof2.4min),acurrentof1.5A(acurrentdensityof375A/m2),andaregenerateiontimeof2h.TheaverageconcentrationofCr(VI)intheregeneratio
6、nsolutionWas723.5mg/L,and44percentoftheresinwasregenerated,withapowerof8.44kWh/molCr(VI)beingconsumed.TheresinafterregenerationdemonstratedgoodperformanceforCr(VI)removal.TheCr(VDconcentrationwasreducedfrominitial50mg/Ltolowerthan0.5mg/Laftertreatment.Theregenerationsolutioncouldbeco
7、ncentratedfurthertoalevelof14.55gchromicacid/LbyED,andthetotalpowerconsumptiononlyincreasedto9.30kWh/molCr(VI).Keywords:CrⅣI),Ionexchange,Electrodialysis,Electricalregeneration,Greenregeneration,Strongelectricalfield,Chromicacid,ReuseIII浙江大学研究生学位论文独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得
8、的研究成果。除了文中特别
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