Enhanced microbial reduction of aqueous hexavalent chromium by Shewanella oneidensis MR-1 with biochar as electron shuttle

作     者：Cholnam Ri Jingchun Tang Feng Liu Honghong Lyu Fengxiang Li Cholnam Ri;Jingchun Tang;Feng Liu;Honghong Lyu;Fengxiang Li

作者机构：College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Key Laboratory of Pollution Processes and Environmental CriteriaMinistry of EducationChina Tianjin Engineering Center of Environmental Diagnosis and Contamination RemediationTianjin 300350China Tianjin Key Laboratory of Clean Energy and pollution controlSchool of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300401China State Academy of SciencesInstitute of MicrobiologyPyongyangDemocratic People's Republic of Korea Tianjin Eco-Environmental Comprehensive Support CenterTianjin300191China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第3期

页      面：12-25页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：The study was supported by the Natural Science Foundation of Tianjin(No.20JCZDJC00700) the National Natural Science Foundation of China(Nos.U1806216,41877372) the National Key R&D Program of China(No.2018YFC1802002) 111 program,Ministry of Education,China(No.T2017002) 

主　　题：Sheiuanella oneidensis MR-1 Cr(VI)reduction Biochar Pyrolysis temperature sSynergistic effect 

摘      要：Biochar, carbonaceous material produced from biomass pyrolysis, has been demonstrated to have electron transfer property(associated with redox active groups and multi condensed aromatic moiety), and to be also involved in biogeochemical redox reactions. In this study, the enhanced removal of Cr(VI) by Shewanella oneidensis MR-1(MR-1) in the presence of biochars with different pyrolysis temperatures(300 to 800 ℃) was investigated to understand how biochar interacts with Cr(VI) reducing bacteria under anaerobic condition. The promotion effects of biochar(as high as 1.07~1.47 fold) were discovered in this process, of which the synergistic effect of BMBC700(ball milled biochar) and BMBC800 with MR-1 was noticeable, in contrast, the synergistic effect of BMBCs(300–600 ℃) with MR-1 was not recognized. The more enhanced removal effect was observed with the increase of BMBC dosage for BMBC700 + MR-1 group. The conductivity and conjugated O-containing functional groups of BMBC700 particles themselves has been proposed to become a dominant factor for the synergistic action with this strain. And, the smallest negative Zeta potential of BMBC700 and BMBC800 is thought to favor decreasing the distance from microbe than other BMBCs. The results are expected to provide some technical considerations and scientific insight for the optimization of bioreduction by useful microbes combining with biochar composites to be newly developed.