Water pollution has become more serious, and the main pollutant in most water bodies is nitrogen. Microbial nitrification / denitrification is one of the most efficient ways to remove nitrogen for wastewater.
In general, traditional microbial nitrogen removal processes involve two parts: aerobic nitrification and anaerobic denitrification. Nitrification and denitrification can be carried out simultaneously in one reactor by a class of microorganisms – heterotrophic nitrification-aerobic denitrification bacteria (HN-AD).
The research group led by prof. Wu Jinshui from the Institute of Subtropical Agriculture (ISA) of the Chinese Academy of Sciences has isolated a new heterotrophic nitrification-aerobic denitrification bacterium – Alcaligenes faecalis WT14, which has the potential to purify high ammonium wastewater.
The study was published in Journal of Environmental Management January 16th.
The researchers found that WT14 can tolerate high concentration nitrogen (NH)4+-N) up to 2000 mg · L-1 and had effective NH4+-N removal rate of 55.9 mg · L-1· H-1.
Unlike other species of Alcaligenes faecalis, WT14 could effectively remove high concentration nitrate (NO3-N) or nitrite (NO2-N) when they are the only sources of nitrogen.
These results imply that WT14 is a new strain of Alcaligenes faecalis and has the potential to treat wastewater containing high strength NH4+-N, NO3“N or NO.”2—N.
Researchers quantify the rate of nitrification at the ecosystem level
Yunli Chen et al. Nitrogen removal characteristics of a new heterotrophic nitrification and aerobic denitrification bacteria, strain Alcaligenes faecalis WT14, Journal of Environmental Management (2021). DOI: 10.1016 / j.jenvman.2021.111961
Provided by the Chinese Academy of Sciences
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