title: Simultaneous biological-photocatalytic treatment with strain CDS-8 and TiO2for chlorothalonil removal from liquid and soil.
abstract: In this study, a novel chlorothalonil (CTN) degrading bacterial strain CDS-8, identified as Pseudomonas sp., was combined with photocatalyst titanium dioxide (TiO2) 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-1TiO2showed the highest COD removal rate (84.10%). Furthermore, combined CDS-8/TiO2treatments could effectively degrade CTN in soil. In treatments with CDS-8/20mgkg-1TiO2of soil, the maximum CTN removal rate reached 97.55% in turned soils. However, with CDS-8/40mgkg-1TiO2of 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.
authors: Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu, Sichuan, 610064, China.
authors: Minghui
authors: M
authors: Wu
authors: Sichuan Tourism University, Chengdu, Sichuan, 610000, China.
authors: Jing
authors: J
authors: Deng
authors: Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu, Sichuan, 610064, China.
authors: Junjie
authors: J
authors: Li
authors: General Electric, China.
authors: Ying
authors: Y
authors: Li
authors: Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu, Sichuan, 610064, China.
authors: Jinze
authors: J
authors: Li
authors: Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu, Sichuan, 610064, China. Electronic address: xuheng64@sina.com.
authors: Heng
authors: H
authors: Xu
mesh_terms: D053758:Nanoparticles / Q000737:chemistry*; D009570:Nitriles / Q000378:metabolism*; D010782:Photolysis; D011549:Pseudomonas / Q000302:isolation & purification / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism*; D014025:Titanium / Q000737:chemistry*; D014978:Xenon
chemical_list: D009570:Nitriles; D012989:Soil Pollutants; C009495:titanium dioxide; D014978:Xenon; D014025:Titanium; C005806:tetrachloroisophthalonitrile
keywords: CDS-8; Chlorothalonil; Simultaneous biological-photocatalytic treatment; Titanium dioxide