Primary biodegradation and mineralization of aryl organophosphate flame retardants by Rhodococcus-Sphingopyxis consortium

文献类型： 外文期刊

第一作者： Wang, Junhuan

作者： Wang, Junhuan;Hlaing, Thet Su;Nwe, May Thet;Aung, Mar Mar;Ren, Chao;Wu, Wei;Yan, Yanchun;Hlaing, Thet Su;Nwe, May Thet;Aung, Mar Mar

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关键词： Organophosphate flame retardants; Triphenyl phosphate; Rhodococcus-Sphingopyxis consortium; Biodegradation; Mineralization

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：9.038； 五年影响因子：8.512 ）

ISSN： 0304-3894

年卷期： 2021 年 412 卷

页码：

收录情况： SCI

摘要： In this study, the biodegradation towards aryl organophosphate flame retardants (aryl-OPFRs) was investigated by the Rhodococcus-Sphingopyxis consortium, mixture of strain Rhodococcus sp. YC-JH2 and Sphingopyxis sp. YCJH3. The optimal ratio between the two composition strains was determined as 1:1. Under the optimum condition (pH 8, 35 ?C and 0% salinity), the consortium could utilize aryl-OPFRs as sole carbon source and degrade them rapidly with half-life of 4.53, 21.11 and 23.0 h for triphenyl phosphate (TPhP), tricresyl phosphate (TCrP) and 2-ethylhexyl diphenyl phosphate (EHDPP) respectively. The consortium maintained high degrading efficiency under a wide of range of pH (6?10), temperature (20?40 ?C) and salinity (0?6%). Besides, the consortium could rapidly degrade high concentration of TPhP and no inhibitory effect towards degradation speed was observed up to 500 mg/L. The effect of metal ions and surfactants was estimated. Most metal ions exhibited significant inhibition, except Zn2+ and Pb2+, which showed no effect or slight promotion. Ionic surfactants could severely reduce the degrading capacity, while nonionic surfactants showed no effect. With abundant inoculation of the consortium, mineralization higher than 75% could be achieved within a week. This study provides efficient microorganisms for bioremediation of aryl-OPFRs contamination.

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