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Environmental Engineering Research 1998;3(1): 55-60.
Comparison of Metabolisms of Single and Mixed Species on Nitramine Degradation
Sung Hyun Kwon1, and In S. Kim2
1R&D Center for Environment, Safety & Health, LG Corporate Institute of Technology, Seoul 137-724, Korea
2Department of Environmental Science and Engineering, Kwangju Institute of Science & Technology, Kwangju, 506-712, Korea
Corresponding Author: Sung Hyun Kwon ,
Received: February 6, 1998;  Accepted: March 1, 1998.
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ABSTRACT
The biodegradation of two popular nitramine energetics were investigated. The HMX (octahydro-1,3,5,7-tetranitro-l,3,5,7-tetrazocine) was mineralized by anaerobic mixed denitrifiers in digested sewage sludge culture. An initial HMX concentration of 120mg/L decreased to a non-detectable level ()99% removal efficiency) in 8 days of incubation under strict anaerobic conditions. It was, however, not effectively metabolized by single denitrifying species. P. aeruginosa, B. subtilis in a nitrogen limiting conditions under their optimum growth conditions. The other nitramine energetic, ADN (ammonium dinitramide), was observed to be mineralized well in the anaerobic mixed culture. The initial ADN concentration of 250mg/L was reduced to non-detectable levels ()99% removal efficiency) in 5days of incubation under anaerobic conditions. These results indicate that anaerobic mixed cultures, compared to the pure mono culutre, are superior in the degradative efficiency of nitramine energetics.
Keywords: Nitramine energetics | HMX | ADN | Biodegradation
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