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微需氧条件会促进厌氧污泥中细菌组成的变化,有利于聚合硅氧烷的生物降解。

Microaerobic conditions in anaerobic sludge promote changes in bacterial composition favouring biodegradation of polymeric siloxanes.

机构信息

Department of Hydraulic and Environmental Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile.

出版信息

Environ Sci Process Impacts. 2021 Aug 1;23(8):1182-1197. doi: 10.1039/d1em00143d. Epub 2021 Jul 24.

DOI:10.1039/d1em00143d
PMID:34302159
Abstract

Volatile organic silicon compounds (VOSiC) are harmful pollutants to the biota and ecological dynamics as well as biogas-based energy conversion systems. However, there is a lack of understanding regarding the source of VOSiCs in biogas, especially arising from the biochemical conversion of siloxane polymers such as polydimethylsiloxanes (PDMS). The biodegradation of PDMS was evaluated under anaerobic/microaerobic conditions (P = 0, 1, 3, 5%), using wastewater treatment plant (WWTP) sludge as an inoculum and PDMS as a co-substrate (0, 50, 100, 500 ppm). On average, strictly anaerobic treatments produced significantly less methane than the 3 and 5% microaerated ones, which show the highest PMDS biodegradation at 50 ppm. Thauera sp. and Rhodococcus sp. related phylotypes were identified as the most abundant bacterial groups in microaerated treatments, and siloxane-related molecules were identified as remnants of PDMS catabolism. Our study demonstrates that microaeration promotes changes to the native bacterial community which favour the biological degradation of PDMS. This confirms that the presence of VOSiC (e.g., D4-D6) in biogas is not only due to its direct input in wastewaters, but also to the PDMS microbial catabolism. Microaerobic conditions enhance both PDMS and (subsequent) VOSiC degradation in the liquid phase, increasing the concentrations of D4 and D5 in biogas, and the production of less toxic siloxane-based derivatives in the liquid phase. This study suggests that microaeration of the anaerobic sludge can significantly decrease the concentration of PDMSs in the WWTP effluent. However, for WWTPs to become effective barriers for the emission of these ecotoxic contaminants to the environment, such a strategy needs to be coupled with an efficient biodegradation of VOSiCs from the biogas.

摘要

挥发性有机硅化合物 (VOSiC) 对生物区系和生态动态以及基于沼气的能量转换系统都是有害的污染物。然而,对于沼气中 VOSiC 的来源,特别是源自硅氧烷聚合物(如聚二甲基硅氧烷 (PDMS))的生化转化,人们的了解还很有限。使用污水处理厂 (WWTP) 污泥作为接种物,并将 PDMS 作为共底物(0、50、100、500 ppm),在厌氧/微氧条件下(P = 0、1、3、5%)评估了 PDMS 的生物降解情况。平均而言,严格的厌氧处理产生的甲烷明显少于 3%和 5%微氧处理,这表明在 50 ppm 时 PDMS 的生物降解率最高。Thauera sp. 和 Rhodococcus sp. 相关的类群被确定为微氧处理中最丰富的细菌群体,硅氧烷相关分子被确定为 PDMS 分解代谢的残留物。我们的研究表明,微氧促进了土著细菌群落的变化,有利于 PDMS 的生物降解。这证实了沼气中 VOSiC(例如 D4-D6)的存在不仅是由于其直接输入废水中,还与 PDMS 的微生物分解代谢有关。微氧条件增强了 PDMS 和(随后的)VOSiC 在液相中的降解,增加了沼气中 D4 和 D5 的浓度,并在液相中产生了毒性较小的硅氧烷衍生化合物。本研究表明,对厌氧污泥进行微氧处理可以显著降低 WWTP 出水中 PDMS 的浓度。然而,为了使 WWTP 成为防止这些生态毒性污染物排放到环境中的有效屏障,这种策略需要与从沼气中有效生物降解 VOSiC 相结合。

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