Extractive biodegradation of diphenyl ethers in a cloud point system: Pollutant bioavailability enhancement and surfactant recycling
Extractive biodegradation of diphenyl ethers in a cloud point system: Pollutant bioavailability enhancement and surfactant recycling
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浊点系统中二苯醚的萃取生物降解：污染物生物利用度增强和表面活性剂回收
DOI：
10.1007/s12257-017-0085-4
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发表时间：
2017-11
影响因子：
3.2
通讯作者：
shuijing yu
中科院分区：
文献类型：
--
作者：
tao pan;Chunyan liu;qiao xin;meiying xu;yangwu deng;wei dong;shuijing yu
二苯醚(DES)的高疏水性限制了其在环境中的生物降解。研究了浊点系统(CPS)对DE生物利用度的提高。用三种CPSS(Triton X-114、Triton X-114+Triton X-45和Brij30+TMN-3)促进DE的生物降解。生物相容性试验表明，TX-114对DE和4-溴二苯醚(4-BDE)的生物降解有抑制作用，TX-114+TX-45对其无影响，而Brij30+TMN-3在碱性铜绿假单胞菌和4%(w/v)非离子表面活性剂作用下培养48h可促进DE和4-BDE的生物降解。用2%(w/v)的Brij30+TMN-3进行进一步优化，得到的DE残留量和4-BDE残留量分别为143和154 mg/L，低于对照。在降解过程中，DEs的含量在凝聚阶段急剧下降，而在稀相中没有减少，说明DES逐渐扩散，并从凝聚阶段转移到稀相被微生物细胞降解。这一行为还提高了DES在CPS中的生物利用度。通过去除富含细胞的稀相，并在凝聚相中加入新鲜降解介质和DE，表面活性剂被成功回收并重复使用两次，而不影响DE的生物降解。结果表明，含2%(w/v)Brij30+TMN-3的CPS不仅提高了DES的生物利用度，而且通过表面活性剂的循环利用降低了处理成本，有利于大规模应用。
The biodegradation of diphenyl ethers (DEs) in the environment is limited by their high hydrophobicity. The enhancement of DE bioavailability by a cloud point system (CPS) was investigated in this study. Three CPSs (i.e., Triton X-114, Triton X-114 + Triton X-45, and Brij30 + TMN-3) were tested to promote DE biodegradation. Biocompatibility tests showed that the biodegradation of DE and 4-bromodiphenyl ether (4-BDE) was inhibited by TX-114, unaffected by TX-114 + TX-45, and promoted by Brij30 + TMN-3 over 48 h of cultivation withCupriavidus basilensisand 4% (w/v) nonionic surfactants. Further optimization with 2% (w/v) Brij30 + TMN-3 yielded residual DE and 4-BDE quantities of 143 and 154 mg/L, respectively, lower than quantities in the control. During degradation, DE content did not decrease in the dilute phase, but sharply decreased in the coacervate phase, indicating that the DEs gradually diffused and transferred from the coacervate phase to the dilute phase for degradation by microbial cells. This behavior also enhanced the bioavailability of DEs in the CPS. By removing the cell-rich dilute phase and adding fresh degradation medium and DE to the coacervate phase, surfactants were successfully recovered and reused twice without affecting DE biodegradation. Results demonstrated that a CPS with 2% (w/v) Brij30 + TMN-3 not only enhanced the bioavailability of DEs, but also decreased the treatment cost through surfactant recycling, which is beneficial for large-scale applications.
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