海洋菌群厌氧生物降解环己甲酸特性研究

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昝帅君,金媛,樊景凤,杜苗苗,王竞.海洋菌群厌氧生物降解环己甲酸特性研究[J].,2023,63(2):135-142

海洋菌群厌氧生物降解环己甲酸特性研究

Study of anaerobic biodegradation characteristics of cyclohexanecarboxylic acid by marine consortium

DOI：10.7511/dllgxb202302004

中文关键词:环烷酸海洋环境厌氧降解电子受体群落结构

英文关键词:naphthenic acid marine environment anaerobic degradation electron acceptor community structure

基金项目:国家自然科学基金资助项目(2187601842177375).

作者	单位
昝帅君,金媛,樊景凤,杜苗苗,王竞

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中文摘要:

环烷酸是一类具有较强毒性的环境新污染物．目前，环烷酸生物降解研究主要集中在陆地和好氧环境，而海洋环境中环烷酸的厌氧生物降解鲜有报道．利用富集的海洋微生物菌群，考察了环己甲酸在不同条件下的厌氧生物降解特性，并通过16S高通量测序对微生物群落结构和功能进行了分析．结果表明：共底物葡萄糖和乙酸钠会抑制环己甲酸的厌氧生物降解；硝酸钠(200 mg/L)可提高环己甲酸厌氧生物降解速率约70%，并在100 mg/L亚微米磁铁共存下进一步提高反硝化降解效率约44.5%，降解过程均符合准一级动力学反应．变形菌门、厚壁菌门和拟杆菌门为优势菌门；弧菌属、交替单胞菌属和梭菌属为优势菌属．此外，细胞膜转运及能量、碳水化合物和氨基酸代谢通路有显著富集．研究拓展了环烷酸在海洋环境中的生物转化行为，并为海洋环境中环烷酸厌氧生物修复提供了启示．

英文摘要:

Naphthenic acids (NAs) are a new class of environmental pollutants with strong toxicity. At present, the biodegradation of NAs is mainly concentrated in the terrestrial environment, and most of them are aerobic degradation, while the anaerobic biodegradation of NAs in the marine environment has rarely been reported. The enriched marine consortium is used to investigate the anaerobic biodegradation characteristics of cyclohexanecarboxylic acid (CHCA) under different conditions, and the microbial community structure and function are analyzed by 16S high-throughput sequencing. The results show that the glucose and sodium acetate of co-substrates can inhibit the anaerobic biodegradation of CHCA, the sodium nitrate (200 mg/L) can increase the anaerobic biodegradation rate of CHCA by about 70%, and the denitrification degradation efficiency is further increased by about 44.5% under the coexistence of 100 mg/L submicron magnets, and the anaerobic biodegradation of CHCA follows the pseudo-first-order kinetic reaction. The Proteobacteria, Firmicutes and Bacteroidetes are the dominant bacterial phyla; Vibrio, Alteromonas and Clostridium are the dominant bacterial genus. In addition, pathways of cell membrane transport and metabolism of energy, carbohydrate and amino acid are significantly enriched during the CHCA degradation. The study expands the biotransformation behavior of NAs and provides enlightenment for the anaerobic bioremediation of NAs in the marine environment.

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海洋菌群厌氧生物降解环己甲酸特性研究

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