Simultaneous degradation of nitroaromatic compounds TNT, RDX, atrazine, and simazine byPseudomonas putidaHK-6 in bench-scale bioreactors

Autor: Yun-Seok Cho, Bheong-Uk Lee, Kye-Heon Oh
Rok vydání: 2008
Předmět:
Zdroj: Journal of Chemical Technology & Biotechnology. 83:1211-1217
ISSN: 1097-4660
0268-2575
Popis: BACKGROUND: Environmental contamination by nitroaromatic compounds such as 2,4,6-trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-s-triazine (RDX), atrazine, and/or simazine (TRAS) generated as waste from military and agricultural activities is a serious worldwide problem. Microbiological treatment of these compounds is an attractive method because many explosives and herbicides are biodegradable and the process can be made cost-effective. We explored the feasibility of using cultures of Pseudomonas putida HK-6 for simultaneous degradation of TRAS with the aim of microbial application in wastewater treatment in bench-scale bioreactors. RESULTS: Experiments were conducted to study the effects of supplemental carbons, nitrogens, and Tween-80 on the degradation of Ps. putida HK-6 in media containing TRAS as target substrate(s). The most effective TRAS degradation was shown in the presence of molasses. Addition of nitrogen sources produced a delayed effect for the target substrate(s). Tween-80 enhanced the degradation of target substrate(s). Simultaneous degradation of these compounds proceeded to completion within the given period. CONCLUSIONS:Ps. putida HK-6 was capable of growth with TRAS, and the effects of supplements on TRAS degradation and simultaneous TRAS degradation were evaluated in bench-scale bioreactors. The results of this study have practical applications in the processes of industrial waste stream treatment where the disposal of TRAS may be problematic. Copyright © 2008 Society of Chemical Industry
Databáze: OpenAIRE
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