AI Article Synopsis
- The study introduces a new biological denitrification technology called heterotrophic nitrification-aerobic denitrification (HNAD) using a newly isolated strain, Cupriavidus metallidurans TX6, which shows resistance to heavy metals.
- The research investigates the strain's genetic expression, enzyme activity, and nitrogen removal capabilities under varying conditions, revealing it utilizes five distinct nitrogen metabolism pathways.
- Findings indicate that strain TX6 can convert significant amounts of nitrogen to intracellular forms while also demonstrating effective aerobic denitrification, suggesting its potential for treating wastewaters contaminated with heavy metals.
Article Abstract
The heterotrophic nitrification-aerobic denitrification (HNAD) is a new biological denitrification technology, the present study isolated a new HNAD strain named Cupriavidus metallidurans TX6 with heavy metal resistance. The gene expression, electron transport, enzyme activity and nitrogen removal property of strain TX6 were studied with different influencing factors. Strain TX6 has five nitrogen metabolism pathways (NH → NHOH → NO → NO → NH → GOGAT/GDH; NH-N → NHOH → NO → NO → N; NH → NHOH → NO → NO → NO; NO → NO → NH → GOGAT/GDH; NO→ NO → NH → GOGAT/GDH). Nitrogen balance analysis shows that 29 ± 4 mg/L of N was converted to intracellular nitrogen by assimilation and 50 ± 3 mg/L N loss may be attributed to aerobic denitrification. The results provide a theoretical basis for the HAND bacteria application in nitrogen removal from wastewaters containing heavy metals.
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| http://dx.doi.org/10.1016/j.envres.2024.120111 | DOI Listing |
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