摘要
针对电阻加热技术修复多环芳烃污染土壤存在能耗高、降低土壤功能性的问题,采用低温条件(80℃)的电阻加热以降低能耗、减少对土壤肥力和细菌群落的影响。利用自主研制的电阻加热装置,探究低温加热对土壤多环芳烃的去除效果、对土壤理化性质和细菌群落的影响。结果表明,在80℃加热180 min条件下,电阻加热对土壤多环芳烃的去除率为21.8%,苯并[a]蒽、苯并[b]荧蒽、苯并[k]荧蒽、?、二苯并[a,h]蒽、茚并[1,2,3-cd]芘和萘的质量分数均低于《土壤环境质量建设用地污染风险管控标准(试行)》(GB 36600-2018)第一类用地筛选值;电阻加热处理后细菌丰度增幅达108%,提高了群落丰富度和多样性,富集了多环芳烃降解菌和功能基因,将厚壁菌门PAHs降解菌的相对丰度放大了近10倍,提高了编码4,5-二羟基邻苯二甲酸酯脱羧酶(K04102)和1,4-二羟基-2-萘甲酰-CoA硫酯酶(K12073)的功能基因预测丰度,且不会对土壤肥力水平造成负面影响。本研究结果可为低温电阻加热在多环芳烃污染土壤修复中的应用提供参考。
To address the problems of high energy consumption and reduced soil functionality in the remediation of polycyclic aromatic hydrocarbons(PAHs)contaminated soil by electrical resistance heating(ERH),low-temperature(80℃)ERH was used to reduce energy consumption and impact on soil fertility and bacterial communities.The effect of low-temperature ERH on soil PAHs removal,soil physicochemical properties and bacterial community was investigated by using a self-made device.The results demonstrated that ERH treatment removed 21.8%of PAHs from soil,the contents of Benzo[a]anthracene,Benzo[b]fluoranthene,Benzo[k]fluoranthene,Chrysene,Dibenz[a,h]anthracene,Indeno[1,2,3-cd]pyrene and Naphthalene were all lower than the screening values for the first category of sites in the Soil Environmental Quality Construction Land Contamination Risk Control Standards(Trial)(GB36600-2018)after ERH treatment.ERH treatment increased bacterial abundance by 108%,improved community richness and diversity,and enriched PAHsdegrading bacteria and functional genes.ERH amplified the relative abundance of PAHs-degrading bacteria in Firmicutes phylum by nearly 10-fold and increased the predicted abundance of functional genes encoding 4,5-dihydroxyphthalate decarboxylase(K04102)and 1,4-dihydroxy-2-naphthoyl-CoA thioesterase(K12073)without negatively affecting soil fertility.The results can provide a reference for the remediation of PAHscontaminated soil by low-temperature ERH treatment.
作者
张晨琛
杨柳青
韩自玉
李烜桢
焦文涛
ZHANG Chenchen;YANG Liuqing;HAN Ziyu;LI Xuanzhen;JIAO Wentao(Laboratory of Soil Environmental Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;Technical Centre for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment,Beijing 100012,China;College of Forestry,Henan Agricultural University,Zhengzhou 450002,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第6期1937-1946,共10页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划资助项目(2018YFC1802106)
国家自然科学基金资助项目(42277011)。
关键词
有机污染土壤
多环芳烃
低温电阻加热
细菌群落构成
多环芳烃降解功能基因
organic contaminated soil
polycyclic aromatic hydrocarbons
low-temperature electrical resistance heating treatment
bacterial community composition
polycyclic aromatic hydrocarbon degradational functional genes
