Research progress of zero-valent-iron microbial coupled system in remediating contaminated groundwater
YUAN Meng-jiao1, WANG Xiao-hui1, ZHAO Fang1, XIN Jia1,2,3
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; 2. The Key Laboratory of Marine Environment & Ecology, Ministry of Education, Qingdao 266100, China; 3. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering(MEGE), Qingdao 266100, China
Abstract：This article mainly reviewed the performance and mechanism of zero-valent iron and microbial coupling system for remediation of contaminated groundwater, introduced the main sources and characteristics of ZVI and microorganisms used in the ZVI-BIO coupled system, and summarized the efficiency, mechanism and products of ZVI-BIO coupled technology for removing chlorinated hydrocarbons, heavy metals (Me) and nitrate in groundwater. Because of the synergistic effect between zero-valent iron and microorganism, compared with a single system, ZVI-BIO coupled system showed obvious advantages for the removal of multiple pollutants, and the final products of the contaminants are more harmless. In addition, the influence factors (including the reactive materials and the environmental factors) of the coupled system were discussed, and the interaction mechanism between zero-valent iron and microorganisms was clarified, the toxicity and stimulation of zero-valent iron play an important role in the growth and community change of microorganisms, and the presence of microorganisms affects the electron transport of zero-valent iron and the composition of corrosion products. Finally, the future research needs were proposed to better understand the advantages and disadvantages of this technology, which is conducive to the efficient application of this technology in groundwater remediation.
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