水泥和活性炭对多环芳烃污染土壤固化稳定化效果的影响  

Effect of cement and activated carbon on solidification/stabilization of PAHs contaminated soil

作　　者：张梦梦[1,2] 王万峰[1] 马福俊[2] 张倩[2] 谷庆宝[2] ZHANG Mengmeng WANG Wanfeng MA Fujun ZHANG Qian GU Qingbao(School of Environment, Henan Normal University, Xinxiang 453007, China Department of Soil Pollution and Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

机构地区：[1]河南师范大学环境学院,河南新乡453007 [2]中国环境科学研究院土壤污染与控制研究室,北京100012

出　　处：《环境工程技术学报》2017年第1期59-64,共6页Journal of Environmental Engineering Technology

基　　金：国家高技术研究发展计划(863计划)项目(2013AA06A207)

摘　　要：固化稳定化技术由于处理费用低、操作简单易行,是污染场地修复常用的技术。评估了水泥和活性炭固化稳定化多环芳烃(PAHs)污染土壤的浸出行为和无侧限抗压强度(UCS)。PAHs污染土壤采用非酸性降水、酸性降水和卫生填埋场共处置3种方法分别浸出时,浸出液中PAHs的浓度分别为2.53、2.74和3.88μg/L;当水泥添加量为土壤质量的20%时,3种方法浸出液中PAHs的浓度分别为8.99、10.12和10.99μg/L;水泥固化稳定化会增加污染土壤中PAHs的浸出浓度,不同情景下PAHs的浸出浓度表现为卫生填埋场共处置>酸性降水>非酸性降水。当水泥添加量为土壤质量的20%,活性炭添加量为土壤质量的1%时,PAHs的浸出浓度为0.99μg/L,活性炭的加入可有效降低浸出液中PAHs的浓度。当水泥添加量分别为土壤质量的10%、20%和30%时,固化稳定化产物28 d的UCS分别为1.82、5.95和12.06 MPa,UCS随着水泥添加量的增多而增大;水泥添加量为土壤质量的20%,活性炭添加量不大于土壤质量的2%时,其UCS与不加活性炭时相当。As a low cost and easy to operate technology, the solidification/stabilization is widely used for remediating contaminated sites. PAHs leachability and unconfined compressive strength（ UCS） of cement-based solidified/stabilized materials with or without activated carbon were evaluated. When the contaminated soil was leached under three scenarios of neutral precipitation, acid precipitation, and co-disposal, the leaching concentrations of PAHs were 2. 53,2. 74 and 3. 88 μg/L,respectively. After treated by cement of 20% soil weight,the leaching concentrations of PAHs were 8. 99,10. 12 and 10. 99 μg/L,respectively under the three scenarios. The leachability of PAHs increased when contaminated soil was solidified/stabilized by cement. PAHs concentrations in leachates were in the order of co-disposal scenario〉 acid-precipitation scenario 〉neutralprecipitation scenario. When the contaminated soil was treated by 20% cement and 1% activated carbon of soil weight,the leaching concentrations of PAHs was 0. 99 μg/L; the addition of activated carbon can significantly lower PAHs concentrations in leachates. 28 d UCS of solidified/stabilized materials was 1. 82,5. 95 and 12. 06 MPa when the contaminated soil was treated by cement of 10%,20% and 30% of soil weight,respectively. UCS of solidified/stabilized materials increased with the adding amounts of cement. When the contaminated soil was treated by 20% cement,UCS of solidified/stabilized materials was not affected by the amount of activated carbon when adding no more than 2% of soil weight.

关 键 词：多环芳烃污染土壤 固化稳定化 浸出行为 无侧限抗压强度 

分 类 号：X53[环境科学与工程—环境工程]