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Biodegradation pathway and mechanism of tri (2-chloropropyl) phosphate by Providencia rettgeri

JOURNAL OF ENVIRONMENTAL SCIENCES 2024年第10期144卷 26-34页

作者： Ye, Jinming Tang, Shaoyu Qiu, Rongliang Chen, Shuona Liu, Huiling South China Agr Univ Coll Nat Resources & Environm Guangzhou 510642 Peoples R China Guangdong Prov Key Lab Agr & Rural Pollut Abatemen Guangzhou 510642 Peoples R China Dongguan Univ Technol Res Ctr Ecoenvironm Engn Dongguan 523808 Peoples R China

Tri (2-chloropropyl) phosphate (TCPP) was an emerging contaminant of global concern because of its frequent occurrence, potential toxic effects, and persistence in the environment. Microbial degradation might be an efficient and safe removal method, but limited information was available. In this study, Providencia rettgeri was isolated from contaminated sediment and showed it could use TCPP as unique phosphorus source to promote growth, and decompose 34.7% of TCPP (1 mg/L) within 5 days. The microbial inoculation and the initial concentration of TCPP could affect the biodegradation efficient. Further study results indicated that TCPP decomposition by Providencia rettgeri was mainly via phosphoester bond hydrolysis, evidenced by the production of bis (2-chloropropyl) phosphate (C6H13Cl2PO4) and mono-chloropropyl phosphate (C3H8ClPO4). Both intracellular and extracellular enzymes could degrade TCPP, but intracellular degradation was dominant in the later reaction stage, and the presence of Cu2+ ions had a promoting effect. These findings developed novel insights into the potential mechanism of TCPP microbial degradation. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

关键词： Chlorinated organophosphate flame retardants Microbial degradation Degradation pathway Providencia rettgeri Tri (2-chloropropyl) phosphate ORGANOPHOSPHATE FLAME RETARDANTS WASTE-WATER TRIS(2-CHLOROETHYL) PHOSPHATE treatment-plant PLASTICIZERS DEGRADATION ESTERS SEDIMENTS TOXICITY PRODUCTS

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