期刊
APPLIED SCIENCES-BASEL
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/app12073626
关键词
livestock wastewater; partial nitrification; ANAMMOX; non-biodegradable organic matter; nitrogen removal; microbial community
类别
资金
- National Natural Science Foundation of China [51408104]
Treatment of livestock wastewater through partial nitrification coupled with anaerobic ammonium oxidation (ANAMMOX) is an effective method for removing ammonium and nitrite from the wastewater. The intermittent aeration strategy promotes high nitrite accumulation efficiency and the growth of dominant ammonium oxidation bacteria. Non-biodegradable organic matter only inhibits ANAMMOX activity at high concentrations.
After the anaerobic digestion of livestock manure, high concentrations of nutrients still remain. Treatment of livestock wastewater through partial nitrification coupled with anaerobic ammonium oxidation (ANAMMOX) could be a useful technology depending on the investigation of microorganism enrichment and partial nitrification coupled with achievement of the ANAMMOX process. The results show 78.4% and 64.7% nitrite accumulation efficiency was successfully obtained in an intermittent aeration sequencing batch reactor and a continuous aeration sequencing batch reactor, respectively, at a loading rate of 0.93 kg ammonium/(m(3)center dot d). The main reason for the high nitrite accumulation efficiency was the intermittent aeration strategy which generated a 20-30 min lag reaction for nitrite oxidation and promoted the growth of the dominant ammonium oxidation bacteria (Nitrosomonas). Non-biodegradable organic matter in the effluents of partial nitrification did not have obvious influence on ANAMMOX activity at low loading rates (118 +/- 13 mg COD/L and 168 +/- 9 mg COD/L), and up to 87.4% average nitrite removal rate was observed. However, with the influent COD concentration increasing to 242 +/- 17 mg/L, the potential inhibition of ANAMMOX activity was exerted by non-biodegradable organic matter.
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