Journal
BIORESOURCE TECHNOLOGY
Volume 361, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127643
Keywords
Leachate; High ammonia nitrogen; High salt; Heterotrophic nitrification -aerobic; denitrification
Funding
- National Natural Science Foundation of China [51908099]
- Project of Science and Technology Research Program of Chongqing Education Commission of China [KJQN202001114]
- Project of Chongqing Banan District of China [2020QC368]
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A highly salt and high ammonia nitrogen tolerant heterotrophic nitrifying bacterium, Alcaligenes faecalis TF-1, was isolated from landfill leachate. The study investigated its nitrogen removal pathway and optimized nitrogen removal conditions.
A novel heterotrophic nitrifying bacterium with high salt and high ammonia nitrogen tolerance, Alcaligenes faecalis TF-1, was isolated from the leachate of a landfill. The verification of nitrogen removal efficiency of different nitrogen sources and PCR amplification electrophoresis results showed that the HN-AD pathway of the strain TF-1 was NH4+ -* NH2OH -* NO -* N2O -* N2. The results of parameter optimization showed that the optimal nitrogen removal conditions were as follows: sodium citrate as carbon source, C/N = 16, pH = 7, and NH4+-N loading of 808.21 mg/L. The strain TF-1 could remove about 94.60% of ammonia nitrogen (1963.94 mg/ L). The salinity tolerance range of the strain TF-1 was 0-70 g/L, and the removal efficiency was 52.87% at salinity 70 g/L and NH4+-N concentration 919.20 mg/L and 55.67% at pH = 10 and NH4+-N concentration 994.82 mg/L. The extreme environmental adaptability and remarkable nitrogen removal performance make this strain a promising candidate in leachate treatment.
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