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.
School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China 510275.
Biotechnol Adv. 2016 Dec;34(8):1384-1395. doi: 10.1016/j.biotechadv.2016.10.004. Epub 2016 Oct 17.
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.
由于大量生产和不当处理，有机卤化物化合物广泛分布于地下环境中，主要存在于缺氧地下水、土壤和沉积物中。与传统的泵抽处理或挖掘处置处理相比，采用非生物或生物还原脱卤作用的原位修复是去除有机卤化物污染物的一种可持续和经济的解决方案。纳米零价铁（nZVI）和有机卤化物呼吸细菌都通过还原脱卤作用去除卤素，已经得到了广泛的研究和成功应用，用于原位修复氯代烯烃和其他有机卤化物污染物。nZVI 和微生物还原脱卤（Bio-RD）相互补充，以提高还原脱卤效率，这表明将 nZVI 与 Bio-RD 结合（Bio-nZVI-RD）可能是一种更有前途的原位修复有机卤化物污染物的策略。在这篇综述中，我们首先概述了有关 nZVI 和有机卤化物呼吸细菌介导的有机卤化物污染物还原脱卤的现有文献，并比较了单一处理方法的优缺点。然后，我们重点介绍了最近研究实施 Bio-nZVI-RD 以实现快速和完全脱卤的研究，并讨论了 Bio-nZVI-RD 的卤素去除机制及其在未来修复应用中的前景。总之，使用 Bio-nZVI-RD 为有效原位修复各种有机卤化物污染物提供了机会。
