title: Integration of organohalide-respiring bacteria and nanoscale zero-valent iron (Bio-nZVI-RD): A perfect marriage for the remediation of organohalide pollutants?
abstract: Due to massive production and improper handling, organohalide compounds are widely distributed in subsurface environments, primarily in anoxic groundwater, soil and sediment. Compared to traditional pump-and-treat or dredging-and-disposal treatments, in situ remediation employing abiotic or biotic reductive dehalogenation represents a sustainable and economic solution for the removal of organohalide pollutants. Both nanoscale zero-valent iron (nZVI) and organohalide-respiring bacteria remove halogens through reductive dehalogenation and have been extensively studied and successfully applied for the in situ remediation of chloroethenes and other organohalide pollutants. nZVI and microbial reductive dehalogenation (Bio-RD) complement each other to boost reductive dehalogenation efficiency, suggesting that the integration of nZVI with Bio-RD (Bio-nZVI-RD) may constitute an even more promising strategy for the in situ remediation of organohalide pollutants. In this review, we first provide an overview of the current literature pertaining to nZVI- and organohalide-respiring bacteria-mediated reductive dehalogenation of organohalide pollutants and compare the pros and cons of individual treatment methods. We then highlight recent studies investigating the implementation of Bio-nZVI-RD to achieve rapid and complete dehalogenation and discuss the halogen removal mechanism of Bio-nZVI-RD and its prospects for future remediation applications. In summary, the use of Bio-nZVI-RD facilitates opportunities for the effective in situ remediation of a wide range of organohalide pollutants.
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, China 510275. Electronic address: wangshanquan@sysu.edu.cn.
authors.forename: Shanquan
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576.
authors.forename: Adrian
authors.initials: A
authors.lastname: Low
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275.
authors.forename: Qihong
authors.initials: Q
authors.lastname: Lu
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, China 510275. Electronic address: eesqrl@mail.sysu.edu.cn.
authors.forename: Rongliang
authors.initials: R
authors.lastname: Qiu
mesh_terms: D000393:Air Pollutants / Q000737:chemistry / Q000378:metabolism; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism; D001673:Biodegradation, Environmental; D054879:Halogenation; D006219:Halogens / Q000737:chemistry / Q000378:metabolism; D006846:Hydrocarbons, Halogenated / Q000737:chemistry / Q000378:metabolism; D007501:Iron / Q000737:chemistry / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D006219:Halogens; D006846:Hydrocarbons, Halogenated; D007501:Iron
keywords: Bio-nZVI-RD; Microbial reductive dehalogenation; Nanoscale zero-valent iron (nZVI); Organohalide-respiring bacteria; Reductive dehalogenation; Remediation