Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu, Sichuan, 610064, China.
Sichuan Tourism University, Chengdu, Sichuan, 610000, China.
J Hazard Mater. 2016 Dec 15;320:612-619. doi: 10.1016/j.jhazmat.2016.07.063. Epub 2016 Jul 26.
In this study, a novel chlorothalonil (CTN) degrading bacterial strain CDS-8, identified as Pseudomonas sp., was combined with photocatalyst titanium dioxide (TiO) for the CTN degradation in liquid and soil. After 7day incubation, 90.73% of CTN was removed from mineral salt medium (MSM) by CDS-8 with the optimal condition at pH 7.0 and 30°C. Single biodegradation or photocatalytic degradation could not degrade CTN completely, and many toxic and persistent intermediate metabolites remained. However, simultaneous biological-photocatalytic treatments could markedly remove CTN and reduce the chemical oxygen demand (COD) which could not be removed by single biodegradation or photocatalytic degradation. In MSM, treatment with CDS-8/40mgL TiO showed the highest COD removal rate (84.10%). Furthermore, combined CDS-8/TiO treatments could effectively degrade CTN in soil. In treatments with CDS-8/20mgkg TiO of soil, the maximum CTN removal rate reached 97.55% in turned soils. However, with CDS-8/40mgkg TiO of soil, the maximum CTN removal rate (94.94%) was found in static soil. In general, the combined biological-photocatalytic treatments provided a promising alternative candidate for the remediation of CTN-contaminated sites.
在这项研究中，一种新型的百菌清（CTN）降解细菌菌株 CDS-8 被鉴定为假单胞菌，与光催化剂二氧化钛（TiO）结合用于液体和土壤中的 CTN 降解。经过 7 天的孵育，在最佳条件 pH7.0 和 30°C 下，CDS-8 从无机盐培养基（MSM）中去除了 90.73%的 CTN。单一的生物降解或光催化降解都不能完全降解 CTN，并且会留下许多有毒和持久的中间代谢物。然而，同时进行生物-光催化处理可以显著去除 CTN 并降低化学需氧量（COD），而单一的生物降解或光催化降解无法去除 COD。在 MSM 中，用 CDS-8/40mgL TiO 处理显示出最高的 COD 去除率（84.10%）。此外，CDS-8/TiO 的联合处理可以有效地降解土壤中的 CTN。在 CDS-8/20mgkg TiO 的土壤处理中，翻动土壤中的 CTN 去除率最高达到 97.55%。然而，在 CDS-8/40mgkg TiO 的土壤处理中，静态土壤中的 CTN 去除率最高（94.94%）。总的来说，联合生物-光催化处理为修复 CTN 污染场地提供了一种有前途的替代方案。
