酒石酸协同草酸淋洗镍污染土壤  

Leaching of nickel-contaminated soil by tartaric acid and oxalic acid

作　　者：李世杰 曹园城 刘超 赵曼青 严欢 高焕方[1] LI Shijie;CAO Yuancheng;LIU Chao;ZHAO Manqing;YAN Huan;GAO Huanfang(College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Huiya Environmental Protection Engineering Co.Ltd.,Chongqing 400041,China;Sichuan Shipu Testing Technology Service Co.Ltd.,Chengdu 610000,China)

机构地区：[1]重庆理工大学化学化工学院,重庆400054 [2]重庆汇亚环保科技有限公司,重庆400041 [3]四川实朴检测技术服务有限公司,四川成都610000

出　　处：《化工环保》2023年第1期87-93,共7页Environmental Protection of Chemical Industry

基　　金：重庆市科技创新应用示范工程项目(cstc2018jszxcyzdX0019)。

摘　　要：研究了柠檬酸、酒石酸、苹果酸和草酸及酒石酸协同草酸淋洗镍污染土壤的效果,优化了淋洗的工艺条件。结果表明:采用0.30 mol/L的酒石酸与0.20 mol/L的草酸以体积比为1∶4配成淋洗剂,淋洗时间为720 min,液固比(淋洗剂体积与土壤质量比,mL/g)为25.0,淋洗剂pH不做调节,淋洗后土壤中镍的去除率达73.7%,镍的浸出质量浓度降至3.89 mg/L,低于危险废物鉴别标准值5 mg/L;酒石酸协同草酸淋洗使土壤中镍的弱酸提取态含量下降了80.2%,可还原态含量下降了74.7%。The leaching effects of citric acid,tartaric acid,malic acid,oxalic acid and tartaric acid combined with oxalic acid on nickel-contaminated soil were studied and the conditions of leaching process were optimized.The results show that:When the eluent is prepared using 0.30 mol/L of tartaric acid and 0.20 mol/L of oxalic acid with 1∶4 of volume ratio,the elution time is 720 min,the liquid-solid ratio(ratio of eluent volume to soil mass,mL/g)is 25.0 and the eluent pH is not adjusted,the nickel removal rate of the soil after leaching reaches 73.7%,and the mass concentration of leached nickel reduces to 3.89 mg/L,which is lower than the standard value of 5 mg/L for hazardous waste identification;Besides,when the contaminated soil is leached using tartaric acid combined with oxalic acid,the content of nickel in weak acid extractable state is reduced by 80.2%,and that in reducible state is reduced by 74.7%.

关 键 词：镍污染土壤 酒石酸 草酸 淋洗 

分 类 号：X705[环境科学与工程—环境工程]