Abstract

Reductive dechlorination is the most efficient way for depletion of chlorinated organic pollutants (COPs) in anaerobic environment, where the methanogenesis is usually mass-produced. Both processes are essentially microbial-mediated electron accepting processes and received much attention in last decades, due to their great importance for the remediation of environment polluted by COPs, and the effect of global warming as well as biogas property, respectively. In this study, these two reductive processes were comprehensively summarized based on 337 measurements out of 68 articles published from 1990 to 2019, with the special interest in digging their potential co-occurrence. A striking relevance between these two processes (p < .05) was shown in most cases, with the accelerated methanogenesis co-occurring with the accelerated reductive removal of COPs. The possible reason underpinning this finding was then extensively discussed. In all, by big data mining associated with discussion regarding the likely involved chemical-microbial mediate mechanisms, this study gives an update evidence showing the synergistic coupling of COP reductive removal and methanogenesis. This provides insights into a novel consideration for site dependent regulation of COP dissipation in conjunction with methanogenesis, either for efficient wastewater treatment with energy saving, or for side-effect overcoming bioremediation of polluted paddy soil.

摘要

还原脱氯是在厌氧环境中消耗氯化有机污染物（COP）的最有效方法，在厌氧环境中通常会大量生产甲烷。这两个过程本质上都是微生物介导的电子接受过程，在过去几十年中受到了广泛的关注，因为它们分别对 COP 污染的环境的修复、全球变暖的影响以及沼气的特性具有重要意义。在这项研究中，基于 1990 年至 2019 年发表的 68 篇文章中的 337 次测量，对这两个还原过程进行了全面总结，特别关注挖掘它们潜在的共现。这两个过程之间的显着相关性（p < .05) 在大多数情况下显示，加速的产甲烷作用与加速的 COP 还原去除同时发生。随后广泛讨论了支持这一发现的可能原因。总之，通过与可能涉及的化学-微生物介导机制的讨论相关的大数据挖掘，本研究提供了更新证据，显示了 COP 还原去除和产甲烷的协同耦合。这提供了一种新的考虑，即与产甲烷相结合的 COP 消散的场地依赖性调节，无论是高效的废水处理和节能，还是克服污染稻田土壤的生物修复的副作用。