Journal
BIORESOURCE TECHNOLOGY
Volume 274, Issue -, Pages 56-64Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.10.052
Keywords
Acinetobacter sp.; Acid-resistant bacterium; Heterotrophic nitrification; Aerobic denitrification; Nitrogen removal pathway
Funding
- Program for the National Natural Science Foundation of China [51778397]
- National Key Research and Development Program of China [2016YFB0600502]
- International Cooperation Projects of Shanxi Province [201603D421040]
- Key research and Development Program of Shanxi Province [201603D321010]
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A new acid-resistant bacterium Acinetobacter sp. JR1 was isolated, and its feasibility in nitrogen removal was investigated under acidic condition. Results show that JR1 indicated excellent ammonium and nitrate removal abilities with no accumulation of intermediates, and the maximum ammonium and nitrate removal efficiencies were 98.5% and 91.1%, respectively. Further experiments demonstrated that JR1 preferred to use ammonium with ammonium and nitrate as the mixed N-sources. For JR1, ammonium was assimilated directly as nutrients into cells and also converted into N-2 through heterotrophic nitrification-aerobic denitrification. Under acidic condition, JR1 performed comparable nitrogen removal abilities to other strains under neutral or weak alkaline environment, and the efficient removal of ammonium occurred at pH 4.5-10, C/N 12-24, 20-40 degrees C, DO >= 4.72 mg/L, 0-1.5% of salinity, 10 mg/L Zn2+ or 20 mg/L Mn2+. All these make JR1 a promising candidate for treating acidic wastewater containing nitrogen.
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