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引用本文:俸文玲,林芷昀,李雅莹,迟浩淳,王诗忠,晁元卿,仇荣亮.Interaction Between Bacteria and Soil Minerals and Application of Bacterial-Mineral Composites in Remediation of Heavy Metals Polluted Soil[J].Acta Pedologica Sinica,2021,58(4):851-861. DOI:10.11766/trxb202007280143
FENG Wenling,LIN Zhiyun,LI Yaying,CHI Haochun,WANG Shizhong,CHAO Yuanqing,QIU Rongliang.Interaction Between Bacteria and Soil Minerals and Application of Bacterial-Mineral Composites in Remediation of Heavy Metals Polluted Soil[J].Acta Pedologica Sinica,2021,58(4):851-861. DOI:10.11766/trxb202007280143
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细菌-矿物互作及其复合体在重金属修复中的应用
俸文玲1, 林芷昀1, 李雅莹1,2, 迟浩淳1, 王诗忠1,2,3, 晁元卿1,2,3, 仇荣亮1,2,3,4
1.中山大学环境科学与工程学院, 广州 510006;2.广东省环境污染控制与修复技术重点实验室, 广州 510006;3.广东省土壤重金属污染修复工程技术中心, 广州 510275;4.岭南现代农业科学与技术广东省实验室, 广州 510642
摘要:
利用功能细菌辅助植物固定重金属是目前农田土壤污染修复中高效且环境友好的方式,其中细菌与矿物间相互作用广泛存在,包括细菌对矿物的溶解作用、矿物对细菌活性的影响以及细菌-矿物复合体的形成等,并贯穿整个修复过程。一方面,细菌与矿物互作会影响细菌的活性和表面特性,如带电性、表面官能团位点类型及浓度等,进而影响细菌对重金属的生物吸附行为以及辅助植物修复作用的发挥;另一方面,细菌-矿物结合形成的复合体较单一细菌、矿物组分对重金属的固定行为不同,在重金属修复过程中发挥不可忽视的作用。本文综合分析细菌与矿物的结合作用、细菌对矿物的溶解作用以及矿物对细菌活性的影响,阐述细菌-土壤矿物(矿物材料)复合体在重金属污染修复中的应用潜能,为复合体应用于重金属污染土壤环境提供理论依据。
关键词:  土壤矿物  细菌  相互作用  重金属  土壤污染修复
DOI:10.11766/trxb202007280143
分类号:Q938.1+3
基金项目:国家自然科学基金项目(41807031,41671313)和广东省自然科学基金项目(2018A030310127)资助
Interaction Between Bacteria and Soil Minerals and Application of Bacterial-Mineral Composites in Remediation of Heavy Metals Polluted Soil
FENG Wenling1, LIN Zhiyun1, LI Yaying1,2, CHI Haochun1, WANG Shizhong1,2,3, CHAO Yuanqing1,2,3, QIU Rongliang1,2,3,4
1.School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China;2.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510006, China;3.Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China;4.Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
Abstract:
The use of functional bacteria to assist phytostabilization is nowadays a practical and eco-friendly method commonly applied to remediation of heavy metals-contaminated farmland soils. The application can effectively control the migration of heavy metal pollutants, reduce the concentration of available heavy metals in the soil, and further on ensure safety of the agricultural production. However, bacteria do not exist independently in soil. Nearly 80%~90% of the microorganisms exist on and adhere to the surface of soil minerals or mineral-organic complexes. Within this in-situ soil remediation process, the interplay between bacteria and minerals, including the formation of bacterial-mineral complexes, the dissolution of minerals by bacteria metabolites and the influence of minerals on bacterial activity, which runs through the whole remediation, should be taken in consideration and show extensive interferences. First, the interplay will affect the surface characteristics of bacteria, such as chargeability, type and concentration of the surface functional groups, etc., which in turn affect biosorption behavior of the bacteria to heavy metals; Secondly, minerals can affect bacterial activity by destroying integrity of the bacterial biofilm, dissolving out mineral ions to poison bacteria and buffering pH in the environment, etc., and disrupt internal physiological regulation mechanisms of the bacteria, which ultimately affect colonization ability of the bacteria on the surface of minerals, growth-promoting function of the bacteria on plants, and ability of the bacteria to immobilize heavy metals. Moreover, the composites formed by combination of bacteria and minerals differ in behavior in immobilization of heavy metals from a single component of bacteria or minerals. This process might promote formation of soil aggregates, improve soil physical structure, and slow down soil degradation, which is conducive to the sustainable use of remedied farmlands, and hence plays an important role in remediation of heavy metals-contaminated soils. At present, the research on relationships between soil minerals, bacteria and heavy metals is still limited, and most of them focus on apparent phenomena. Therefore, this paper is oriented to comprehensively review the combination of bacteria and minerals, the dissolution effect of bacteria on minerals and the influence of minerals on bacterial activity, and expound the application potential of bacteria-soil mineral(mineral material)complexes in remediation of heavy metal polluted soils, so as to provide a theoretical basis for the application of bacteria-mineral complexes in the heavy metals -contaminated soil environment.
Key words:  Soil minerals  Bacteria  Interaction  Heavy metal  Remediation