Water pollution has become more and more serious, and the main pollutant in most water bodies is nitrogen. Microbial nitrification/denitrification is one of the most effective nitrogen removal pathways for wastewater.
Generally, the traditional processes of microbial nitrogen removal include 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 (HN-AD) bacteria.
A research group led by Prof. WU Jinshui from the Institute of Subtropical Agriculture (ISA) of the Chinese Academy of Sciences isolated a novel heterotrophic nitrification-aerobic denitrification bacterium - Alcaligenes faecalis WT14, which has the potential to treat high-ammonium wastewater.
The study was published in Journal of Environmental Management on Jan. 16.
The researchers found WT14 could tolerate high concentration ammonia nitrogen (NH4+-N) up to 2000 mg·L-1 and had an efficient NH4+-N removal rate of 55.9 mg·L-1·h-1.
Unlike other Alcaligenes faecalis species, WT14 could efficiently remove high concentration nitrate (NO3--N) or nitrite (NO2--N) when they are the sole nitrogen sources.
These results implied that WT14 is a novel Alcaligenes faecalis strain and has the potential for treating wastewater containing high-strength NH4+-N, NO3--N, or NO2--N.
Under the guidance of Prof. FANG Yunting and ZHU Weixing from Institute of Applied Ecology, Chinese Academy of Sciences, Dr. LIU Dongwei and her colleagues analyzed the concentrations and N isotopes of soil ammonium and nitrate collected from the grassland transect.
IAP scientists presented the first isotopic evidence that fossil fuel emissions and NH3 slip from power plants are more important than agricultural sources during haze pollution periods in urban Beijing. These emissions contribute 90% of the total NH3 during hazy days in ...
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