College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; State Academy of Sciences, Institute of Microbiology, Pyongyang, Democratic People's Republic of Korea.
College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, China; Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
J Environ Sci (China). 2022 Mar;113:12-25. doi: 10.1016/j.jes.2021.05.023. Epub 2021 Jun 13.
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 °C) 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 °C) 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.
生物炭是由生物质热解产生的碳质材料，已被证明具有电子转移特性（与氧化还原活性基团和多稠环芳香部分有关），并且还参与生物地球化学氧化还原反应。在这项研究中，研究了不同热解温度（300 至 800°C）的生物炭存在下 Shewanella oneidensis MR-1（MR-1）对 Cr(VI)的增强去除作用，以了解生物炭在厌氧条件下如何与 Cr(VI)还原菌相互作用。在这个过程中发现了生物炭（高达 1.07~1.47 倍）的促进作用，其中 BMBC700（球磨生物炭）和 BMBC800 与 MR-1 的协同作用很明显，相比之下，BMBCs（300-600°C）与 MR-1 的协同作用则不明显。随着 BMBC700+MR-1 组中 BMBC 用量的增加，观察到了更增强的去除效果。BMBC700 颗粒本身的电导率和共轭含 O 官能团被认为是与该菌株协同作用的主要因素。并且，BMBC700 和 BMBC800 的最小负 Zeta 电位被认为有利于减小微生物的距离，而其他 BMBC 则没有。该结果有望为通过有用微生物与生物炭复合材料结合来优化生物还原提供一些技术考虑和科学见解，以便新开发。
