摘要
以风化煤为原料,经交联改性制成固定化载体,联合高效耐铅的功能菌株得到了一种风化煤固定化微生物(WC-MI).通过土壤培养实验研究了WC-MI添加对铅污染土壤的修复效果及其钝化机制,结果表明:WC-MI可使土壤中DTPA可提取态铅含量显著降低38.5%,TCLP可提取态铅含量显著降低8.2%;WC-MI添加下弱酸提取态铅占比下降了14%,残渣态铅占比提高了18%;WC-MI修复56 d后,土壤有机质含量、阳离子交换量和电导率分别提高了556%、30%和60%;WC-MI对土壤铅的钝化机制主要包括表面官能团(C-OH、C=O、-COOH、-NH2)与Pb(II)之间的离子交换、络合、沉淀及物理吸附作用.WC-MI在修复铅污染土壤和改善土壤肥力方面具有较高的应用潜力.
A weathered coal-immobilized microbial material(WC-MI)was used to remediate lead-contaminated weak alkaline soil through an incubation experiment.The results showed that the addition of WC-MI caused a decrease of DTPA extractable lead by 38.5%,TCLP extractable lead in by 8.2%,and weak-acid extractable lead by 14%,but an increase of stable residual lead by 18%.The application of WC-MI can also increase the content of soil electric conductivity,cation exchange capacity and organic matter by 60%,30%and 556%,respectively,after 56 days.The passivation of lead by WC-MI is mainly attributable to complexation,precipitation and adsorption of Pb(II),in association with surface functional groups(C-OH,C=O,-COOH,-NH2).This study indicates that WC-MI has high potential in remediating lead-contaminated soils,and improving soil structure and fertility.
作者
李建华
庞黛
焦子乐
李林
张强
陈潇晶
卢晋晶
郜春花
徐明岗
LI Jianhua;PANG Dai;JIAO Zile;LI Lin;ZHANG Qiang;CHEN Xiaojing;LU Jinjing;GAOChunhua;XU Minggang(Soil Health Laboratory of Shanxi Province,Institute of Eco-environment and Industrial Technology,Shanxi Agricultural University,Taiyuan 030031;College of Resources and Environment,Shanxi Agricultural University,Jinzhong 030801)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第12期369-379,共11页
Acta Scientiae Circumstantiae
基金
山西省自然科学研究面上项目(No.202103021224137)
山西农业大学博士科研启动项目(No.2021BQ48)
国家重点研发计划(No.2020YFC1806504-03)。
关键词
铅污染土壤
固定化微生物
风化煤
修复效果
修复机制
lead contaminated soil
immobilized microbial
weathered coal
remediating effect
remediating mechanism
