资源描述:
《化学淋洗法对铀污染土壤修复效果研究》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、doi:10.3969/j.issn.1007-7545.2019.11.017化学淋洗法对铀污染土壤的修复效果研究沈威1,高柏1,2,章艳红1,2,张海阳1,牛天洋1,杨冰3,连国玺3(1.东华理工大学水资源与环境工程学院,南昌330013;2.东华理工大学核资源与环境国家重点实验室,南昌330013;3.中核第四研究设计工程有限公司,石家庄050021)摘要:采用振荡淋洗方法对三种粒径(+2mm、-2mm+0.15mm、-0.15mm)某尾矿库周边铀污染土壤进行去污试验,选用盐酸、硝酸、柠檬
2、酸、草酸为淋洗剂,通过控制淋洗浓度、液固比、时间、温度、混合淋洗等因素来确定较优的淋洗条件。结果表明:各淋洗剂对铀污染土壤的去污效果为草酸>盐酸>硝酸>柠檬酸;当淋洗浓度大于0.5mol/L、淋洗时间大于8h或液固比大于10︰1时,其淋洗效果都逐渐趋于稳定;提高淋洗温度可显著提升淋洗效果;选用草酸+盐酸和草酸+硝酸两组较优混合淋洗组合对全粒径土壤进行淋洗时,土壤中铀去除率均达50%以上,总含铀量分别降至27.15、24.32mg/kg,均达到土壤修复目标(40mg/kg)。关键词:放射性核素;铀
3、污染土壤;粒径;混合淋洗中图分类号:X53文献标志码:A文章编号:1007-7545(2019)11-0000-00StudyonRemediationEffectofUraniumContaminatedSoilbyChemicalElutionSHENWei1,GAOBai1,2,ZHANGYan-hong1,2,ZHANGHai-yang1,NIUTian-yang1,YANGBing3,LIANGuo-xi3(1.SchoolofWaterResourcesandEnvironmenta
4、lEngineering,EastChinaUniversityofTechnology,Nanchang330013,China;2.StateKeyLaboratoryofNuclearResourcesandEnvironment,EastChinaUniversityofTechnology,Nanchang330013,China;3.TheFourthResearchandDesignEngineeringCorporationofCNNC,Shijiazhuang050021,Ch
5、ina)Abstract:Oscillationleachingmethodwasappliedtoconductdecontaminationexperimentforthreekindsofparticlesize(+2mm,-2mm+0.15mm,-0.15mm)ofcontaminatedsoilssurroundinguraniumtailings.Theoptimumleachingconditionswereobtainedbysinglefactortestthroughsele
6、ctionofhydrochloricacid,nitricacid,citricacid,andoxalicacidaselutingagent,andbycontrollingelutionconcentration,L/S,time,temperature,andmixtureelution.Theresultsshowthatremovaleffectofleachingagentonuraniumcontaminatedsoilisoxalicacid>hydrochloricacid
7、>nitricacid>citricacid.Whenleachingconcentrationis0.5mol/Laboveandleachingtimeis8haboveorL/S>10/1,elutioneffectgraduallytendstobestable.Elutioneffectcanbesignificantlyimprovedbyincreasingleachingtemperature.Whentwogroupsofoxalicacid+hydrochloricacida
8、ndoxalicacid+nitricacidareselectedforelutionagent,uraniumremovalrateinsoilwithfullgrainsizeis50%above,andtotaluraniumcontentdropto27.15and24.32mg/kgrespectively,allofwhichreachesthesoilremediationtarget(40mg/kg).Keywords:radionuclide;uraniumcontamina