Comparison of metabolic nitramine degradation by denitrifying species |
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Authors: | Sung‐Hyun Kwon |
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Affiliation: | 1. R&2. D Center for Environment Safety and Health , LG Corp. Institute of Technology , 134 Shinchon‐Dong, Seodaemoon‐Gu, Seoul, 120–749, Korea |
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Abstract: | The biodegradation of two popular nitramine energetics were investigated. The HMX (octa‐hydro‐1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine) was mineralized by anaerobic mixed denitrifiers in digested sewage sludge culture. An initial HMX concentration of 120 mg/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 condition under their optimum growth conditions. The other nitramine energetic, ADN (ammonium dinitramide), was mineralized well in the anaerobic mixed culture. The initial ADN concentration of 250 mg/L was reduced to non‐detectable levels (> 99% removal efficiency) in 5 days of incubation under anaerobic conditions. These results show that the anaerobic mixed culture, compared to the pure monoculture, is superior in the degradation of nitramine energetics. |
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Keywords: | HMX ADN biodegradation energetics |
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