首页|混合有机磷阻燃剂污染物的微生物降解特性及途径

混合有机磷阻燃剂污染物的微生物降解特性及途径

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为了获得更多高效降解有机磷阻燃剂(OPFRs)的菌种资源,探明OPFRs微生物降解途径和作用机制,本研究以一株从广州某污水处理厂剩余污泥中筛选获得的对多种典型OPFRs具有降解能力的太平洋芽孢杆菌(Bacillus pacificus)为研究材料,选取环境中检出率高的磷酸三(2-氯乙基)酯(TCEP)、磷酸三(2-氯丙基)酯(TCPP)、磷酸三甲苯酯(TCP)、磷酸三苯酯(TPhP)作为OPFRs典型代表污染物,开展OPFRs混合污染物微生物降解研究.结果表明:Bacillus pacificus 能以 4 种 OPFRs(TCEP、TCPP、TCP、TPhP)作为磷源生长代谢.在投菌量为 1.0g/L,污染物初始浓度为 1.0mg/L 时,Bacillus pacificus对TCP的降解效果显著,在第9d的降解率达96.1％,另外3种OPFRs的降解率为23％～34％.4种OPFRs的主要降解途径均是通过磷酯键断裂,最终生成氯乙醇、氯丙醇、磷酸和苯类等小分子化合物.其中,TCEP和TCPP还可以通过末端脱氯进行分解,生成磷酸三丙酯和磷酸三(2-乙基丙基)酯,而TCP则还可以通过甲氧基化而被分解为磷酸三甲酯.研究表明:Bacillus pacificus能耐受并有效降解4种常见的OPFRs混合污染物,可为环境OPFRs污染治理提供新思路和优质的微生物菌种资源.
The degradation characteristics and pathways of organophosphorus flame retardants mixtures by Bacillus pacificus
In order to obtain more microbial species for degrading organophosphate flame retardants(OPFRs),and to reveal the pathway and mechanism of OPFRs biodegradation,the present isolated study a strain named Bacillus pacificus isolated from the residual sludge of a wastewater treatment plant in Guangzhou.The strain was proved to degrade a variety of OPFRs mixtures(including tris(2-chloroethyl)phosphate(TCEP),tris(2-chloropropyl)phosphate(TCPP),tritolyl Phosphate(TCP)and triphenyl phosphate(TPhP)).Bacillus pacificus used these four representative OPFRs as phosphorus sources for growth and metabolism.The results showed that 1.0mg/L TCP could be degraded efficiently by 1.0g/L of Bacillus pacificus,whose removal rate was 96.1％on the 9th day.While the biodegradation rates of other threes OPFRs were 23％to 34％.The four OPFRs were mainly degraded via phosphoester bond hydrolysis,and the final degradation produsts were small molecule compounds such as chloroethanol,chloropropanol,phosphoric acid,and benzene.In addition,TCEP and TCPP could be also decomposed by terminal dechlorination to produce tripropyl phosphate and tris(2-ethylpropyl)phosphate.TCP could be decomposed to trimethyl phosphate by methoxylation.The present study indicate that Bacillus pacificus can tolerate and effectively OPFRs mixtures,which can provide new ideas and high-quality microbial strain resources for OPFRs pollution management.

organophosphate flame retardantsmicrobial degradationmixed pollutiondegradation pathwaysBacillus pacificus

罗雅嫣、汤蕙齐、李翼远、欧阳浩民、黄鸿、陈烁娜、仇荣亮

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华南农业大学资源环境学院,广东广州 510642

岭南现代农业科学与技术广东省实验室河源分中心,广东河源 517000

广东省农业农村污染治理与环境安全重点实验室,广东 广州 510642

有机磷阻燃剂 微生物降解 混合污染 降解途径 太平洋芽孢杆菌

广东省自然科学基金国家自然科学基金广东省重点领域研发计划河源市科技计划岭南现代农业科学与技术广东省实验室河源分中心自主科研项目

2023A1515030284423072832023B0202020001河科2021001DT20220016

2024

中国环境科学
中国环境科学学会

中国环境科学

CSTPCDCHSSCD北大核心
影响因子：2.174
ISSN：1000-6923
年,卷(期)：2024.44(6)
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