纳米铁原位注入技术对六价铬污染地下水的修复
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摘要
纳米零价铁原位注入是六价铬污染地下水的有效修复技术之一。为验证其场地修复效果,在北京某电镀厂搬迁后的遗留六价铬污染场地,现场制备纳米铁并通过原位注入对场地内六价铬污染地下水进行原位修复现场中试研究。选取6 m×6 m实验场地,在地下水中六价铬污染浓度最高为2 mg·L~(-1)的中心点设置注射井并在四周设置4口监测井。实验结果表明,原位注入纳米铁药剂具有良好修复效果,修复后该实验场地范围内地下水中六价铬浓度均低于地下水质量Ⅳ类标准0.1 mg·L~(-1),注射井中六价铬还原率达到99%。通过对注射井及监测井地下水中pH、溶解氧、氧化还原电位等检测指标进行跟踪监测和相关性分析,发现氧化还原电位与污染物浓度变化相关性最强,可以作为污染物变化的表征因子。该中试研究结果对于六价铬污染地下水的原位修复具有重要的参考价值。
In-situ injection of nanoscale zero valent iron(nZVI) is an effective technology for the remediation of chromium(Ⅵ)(Cr(Ⅵ)) contaminated groundwater.A field pilot test was carried out in a Cr(Ⅵ) contaminated site where the electroplate factory located in Beijing.One injection well surrounded with four monitoring wells was installed in the central of the test site(6 m × 6 m).Before test,the highest Cr(Ⅵ) concentration of the groundwater in the injection well is up to 2 mg·L~(-1).The monitoring data showed that Cr(Ⅵ) could be effectively removed by injection of nZVI prepared in the field.After 5 days,the concentrations of Cr(Ⅵ) in the test site decreased to below 0.1 mg·L~(-1),and the removal efficiency of Cr(Ⅵ) was up to 99%.Compared with p H and DO,a better linear relationship between ORP and Cr(Ⅵ) concentration was found.The pilot scale test proved that the technology of in-situ injection of nZVI was of great value in the remediation of Cr(Ⅵ) contaminated groundwater.
In-situ injection of nanoscale zero valent iron(nZVI) is an effective technology for the remediation of chromium(Ⅵ)(Cr(Ⅵ)) contaminated groundwater.A field pilot test was carried out in a Cr(Ⅵ) contaminated site where the electroplate factory located in Beijing.One injection well surrounded with four monitoring wells was installed in the central of the test site(6 m × 6 m).Before test,the highest Cr(Ⅵ) concentration of the groundwater in the injection well is up to 2 mg·L~(-1).The monitoring data showed that Cr(Ⅵ) could be effectively removed by injection of nZVI prepared in the field.After 5 days,the concentrations of Cr(Ⅵ) in the test site decreased to below 0.1 mg·L~(-1),and the removal efficiency of Cr(Ⅵ) was up to 99%.Compared with p H and DO,a better linear relationship between ORP and Cr(Ⅵ) concentration was found.The pilot scale test proved that the technology of in-situ injection of nZVI was of great value in the remediation of Cr(Ⅵ) contaminated groundwater.
引文
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[17]李书鹏,刘鹏,杜晓明,等.采用零价铁-缓释碳修复氯代烃污染地下水的中试研究[J].环境工程,2013,31(4):53-58
[18]NEMECEK J,POKORNY P,LACINOVA L,et al.Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using n ZVI and whey:A remedial pilot test[J].Journal of Hazardous Materials,2015,300:670-679
[19]JOHNSON R L,NURMI J T,O'BRIEN JOHNSON G S,et al.Field-scale transport and transformation of carboxymethylcellulose-stabilized nano zero-valent iron[J].Environmental Science&Technology,2013,47(3):1573-1580
[2]曹泉,王兴润.铬渣污染场地污染状况研究与修复技术分析[J].环境工程学报,2009,3(8):1493-1497
[3]郑西来,唐凤琳,辛佳,等.污染地下水零价铁原位反应带修复技术:理论·应用·展望[J].环境科学研究,2016,29(2):155-163
[4]朱文会,董良飞,王兴润,等.Cr(Ⅵ)污染地下水修复的PRB填料实验研究[J].环境科学,2013,34(7):2711-2717
[5]环境保护部.污染场地修复技术目录:第一批[R].北京:中国环境保护产业发展报告,2015
[6]谷庆宝,郭观林,周友亚,等.污染场地修复技术的分类、应用与筛选方法探讨[J].环境科学研究,2008,21(2):197-202
[7]孟梁,郭琳,杨洁,等.原位修复氯代烃污染场地地下水的现场中试研究[J].工业水处理,2014,34(8):18-21
[8]QUINN J,GEIGER C,CLAUSEN C,et al.Field demonstration of DNAPL dehalogenation using emulsified zero-valent iron[J].Environmental Science&Technology,2005,39(5):1309-1318
[9]WEI Y T,WU S C,CHOU C M,et al.Influence of nanoscale zero-valent iron on geochemical properties of groundwater and vinyl chloride degradation:A field case study[J].Water Research,2010,44(1):131-140
[10]朱岩,张亚雷,代朝猛,等.纳米零价铁颗粒用于地下水原位修复的研究进展[J].现代农业科技,2015(4):204-208
[11]TOSCO T,PAPINI M P,VIGGI C C,et al.Nanoscale zero valent iron particles for groundwater remediation:A review[J].Journal of Cleaner Production,2014,77:10-21
[12]刘永.零价铁还原去除污染水体中的六价铬[D].杭州:浙江大学,2006
[13]李梓涵.分散型纳米零价铁的制备及去除地下水中的Cr(Ⅵ)的研究[D].北京:轻工业环境保护研究所,2014
[14]HE F,ZHAO D,PAUL C.Field assessment of carboxymethyl cellulose stabilized iron nanoparticles for in situ destruction of chlorinated solvents in source zones[J].Water Research,2010,44(7):2360-2370
[15]ELLIOTT D W,ZHANG W X.Field assessment of nanoscale bimetallic particles for groundwater treatment[J].Environmental Science&Technology,2001,35(24):4922-4926
[16]BENNETT P,HE F,ZHAO D,et al.In situ testing of metallic iron nanoparticle mobility and reactivity in a shallow granular aquifer[J].Journal of Contaminant Hydrology,2010,116:35-46
[17]李书鹏,刘鹏,杜晓明,等.采用零价铁-缓释碳修复氯代烃污染地下水的中试研究[J].环境工程,2013,31(4):53-58
[18]NEMECEK J,POKORNY P,LACINOVA L,et al.Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using n ZVI and whey:A remedial pilot test[J].Journal of Hazardous Materials,2015,300:670-679
[19]JOHNSON R L,NURMI J T,O'BRIEN JOHNSON G S,et al.Field-scale transport and transformation of carboxymethylcellulose-stabilized nano zero-valent iron[J].Environmental Science&Technology,2013,47(3):1573-1580