期刊
ENVIRONMENTAL TECHNOLOGY
卷 31, 期 4, 页码 409-416出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330903508922
关键词
heterotrophic nitrification; aerobic denitrification; biologic nitrogen removal; Bacillus strain
资金
- National Science Foundation of China [20676078]
The heterotrophic nitrification and aerobic denitrification capabilities of Bacillus sp. LY were investigated under the aerobic condition. The results indicate that Bacillus sp. LY is not only a heterotrophic nitrifier, but also an aerobic denitrifier. Experiments were carried out in an attempt to determine and quantify the contribution of heterotrophic nitrification and aerobic denitrification to total N removal. By taking the nitrogen balance under the culture condition of 41.1 mg/L of initial NH4 (+)-N at a C/N ratio of 15 in 96 h, 8.0% of the initial NH4+-N still remained in the medium in the forms of hydroxylamine, nitrite, nitrate and organic N; 40.5% of NH4+-N was converted to biomass and 45.9% of NH4 (+)-N was estimated to be finally removed in the formation of N-2. This conversion of ammonium to N-2 with the intermediate formation of N2O under the aerobic condition was confirmed by gas chromatography. Single step nitrogen removal by simultaneous heterotrophic nitrification and aerobic denitrification has great potential in wastewater treatment.
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