Daisuke Inoue, Ryugo Nishimine, Shinpei Fujiwara, Kousuke Minamizono, Michihiko Ike
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引用次数: 0
摘要
生物修复是减轻氯化醚(CEs)和 1,4-二恶烷(DX)混合污染的一种可行方法。然而,同时去除 CEs 和 DX 的好氧生物修复方法仍然具有挑战性。本研究旨在探索假心皮癣菌 D17(D17)有氧降解 CEs 的能力及其同时去除 CEs 和 DX 的适用性。单个CE的有氧降解实验表明,D17能降解三氯乙烯(TCE)、二氯乙烯(DCE)的三种异构体和氯乙烯(VC),其降解能力的变化趋势为顺式-1,2-DCE(cDCE)> VC > TCE > 反式-1,2-DCE > 1,1-DCE。值得注意的是,即使没有任何辅助底物,D17 也能表现出降解 CE 的活性。此外,当 TCE、cDCE 或 VC 与 DX(每种浓度为 1 mg/L)同时存在时,D17 降解这两种化合物的能力不会受到明显抑制(对 TCE 和 cDCE),或仅受到短暂且可逆的暂停(对 VC)。这些研究结果表明,D17 是一种对 CEs 和 DX 共污染进行有氧生物修复的有前途的制剂,并为未来开发高效的有氧生物修复策略提供了新的见解。
Aerobic biodegradation of chlorinated ethenes by Pseudonocardia sp. D17: Biodegradation ability without auxiliary substrates and concurrent biodegradation with 1,4-dioxane
Bioremediation is a promising approach for mitigating commingled contaminations of chlorinated ethenes (CEs) and 1,4-dioxane (DX). However, aerobic bioremediation to simultaneously remove CEs and DX remains challenging. This study aimed to explore the ability of Pseudonocardia sp. D17 (D17) to aerobically degrade CEs and its applicability for concurrent removal of CEs and DX. Aerobic degradation experiments of individual CEs revealed that D17 could degrade trichloroethene (TCE), three isomers of dichloroethene (DCE), and vinyl chloride (VC), and the trend of its degradation ability was cis-1,2-DCE (cDCE) > VC > TCE > trans-1,2-DCE > 1,1-DCE. Notably, the CE-degrading activity of D17 was expressed even without any auxiliary substrates. Further, when TCE, cDCE, or VC was co-present with DX (each at 1 mg/L), D17 could degrade both compounds without any significant inhibition (for TCE and cDCE) or with only a transient and reversible suspension of its DX degradation ability (for VC). These findings indicated that D17 is a promising agent for the aerobic bioremediation of CEs and DX co-contamination and provide novel insights into the future development of efficient aerobic bioremediation strategies.