Industrial Water Treatment ›› 2022, Vol. 42 ›› Issue (5): 26-33. doi: 10.19965/j.cnki.iwt.2021-0779

• SUMMARIES AND THESES ON SPECIAL TOPICS • Previous Articles     Next Articles

Performance characteristics and mechanism of removal of heavy metal ions from wastewater by microbial electrolytic cell

Xiuding SHI1(), Jing WANG1, Ming JIANG2, Tianguo LI2(), Wenchuang GUAN1, Hongyan MA2, Xuan ZHU2, Jing XIE1   

  1. 1. Faculty of Architectural Engineering, Yunnan Agricultural University, Kunming 650201, China
    2. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
  • Received:2022-03-13 Online:2022-05-20 Published:2022-06-07

微生物电解池去除废水中重金属的性能特征与机制

石秀顶1(), 王静1, 蒋明2, 李天国2(), 管文闯1, 马红艳2, 朱煊2, 谢晶1   

  1. 1. 云南农业大学建筑工程学院,云南 昆明 650201
    2. 云南农业大学资源与环境学院,云南 昆明 650201
  • 作者简介:

    石秀顶(1996— ),硕士。E-mail:

    李天国,博士,讲师。E-mail:

  • 基金资助:
    国家自然科学基金项目(51768074); 云南省自然科学基金(2018FD020); 云南农业大学科研启动基金(A2002419)

Abstract:

Microbial electrolytic cells(MECs),an organic combination of electroactive microorganisms and electrochemical systems,have great potential to overcome the low efficiency,uneconomic and secondary pollution in the purification of low concentration heavy metal wastewater by traditional physicochemical methods. The research status,influencing factors and mechanism of the removal of heavy metals from wastewater by MECs were summarized. The review showed that MECs could effectively remove a variety of heavy metal ions from wastewater through negative/anode reduction reaction,chemical precipitation and microbial adsorption. For Cr(Ⅵ),Cu(Ⅱ) and Ag(Ⅰ) metal ions with high potential,the removal efficiency of MECs could reach 95.0%-99.1% with the cathode reduction as the main removal mechanism. For low potential metal ions,microbial adsorption and chemical precipitation were dominant,and the efficiency reached 40.7%-87.0%. The removal process of heavy metals by MECs was mainly affected by electrode materials,chemical characteristics of solution and auxiliary voltage. Among them,cathode catalytic performance,material cost and long-term stability were the key parameters that affected the MECs efficiency. However,there were few reports about the treatment of heavy metals by MECs at present. Such as investment cost,adaptation scale and technology amplification of MECs devices still restricted the popularization and application of this technology. Strengthening the development of MECs economic electrode,the analysis and control of key factors,the study of purification mechanism and electron transfer pathway were the key to reduce the construction cost,improve the scale of treatment,adapt to the complex wastewater environment and promote the application of MECs technology.

Key words: microbial electrolysis cells, heavy metal, removal performance

摘要:

微生物电解池(MECs)有机结合了电活性微生物与电化学系统,其克服了传统物化法净化低浓度重金属废水时低效、不经济和产生二次污染等缺点,在处理低浓度重金属废水中具有较大应用潜力。总结归纳了MECs处理重金属废水的研究现状、影响因素以及作用机制等。综述表明,MECs可能通过阴/阳极还原反应、化学沉淀以及微生物吸附等机制,有效去除废水中多种重金属离子,对于Cr(Ⅵ)、Cu(Ⅱ)和Ag(Ⅰ)等高电位金属离子,以阴极还原去除为主导,其MECs净化效率达95.0%~99.1%,而对于低电位金属离子,以微生物吸附与化学沉淀为主导,效率达40.7%~87.0%。重金属的MECs去除过程主要受到电极材料、溶液化学特征和辅助电压等因素的影响,其中,阴极催化性能、材料成本和长期稳定性是影响MECs效能的关键参数。但目前MECs处理重金属的报道较少,MECs装置投资成本、适应规模和技术放大等依然制约着该技术推广应用;加强MECs经济电极开发、关键因素分析与调控、净化机制与电子转移途径的研究是降低构造成本、提升处理规模、适应复杂废水环境以及推动MECs技术广泛应用的关键所在。

关键词: 微生物电解池, 重金属, 去除性能

CLC Number: