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Nitrogen removal by Providencia rettgeri strain YL with heterotrophic nitrification and aerobic denitrification

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Version 2 2016-02-26, 05:17
Version 1 2016-01-30, 00:25
journal contribution
posted on 2016-02-26, 05:17 authored by Jun Ye, Bin Zhao, Qiang An, Yuan-Sheng Huang

Providencia rettgeri strain YL shows the capability of nitrogen removal under sole aerobic conditions. By using isotope ratio mass spectrometry, 15N-labelled N2O and N2 were detected in aerobic batch cultures containing , or . Strain YL converted , and to produce more N2O than N2 in the presence of . An 15N isotope tracing experiment confirmed that the nitrogen removal pathway of strain YL was heterotrophic nitrification-aerobic denitrification. The optimal treatment conditions for nitrogen removal were pH of 8, C/N ratio of 12, temperature of 25°C and shaking speed of 105 rpm. A continuous aerobic bioreactor inoculated with strain YL was developed. With an influent concentration of 90–200 mg/L, the removal efficiency ranged from 80% to 97% and the total nitrogen removal efficiency ranged from 72% to 95%. The nitrogen balance in the continuous bioreactor revealed that approximately 35–52% of influent was denitrified aerobically to form gaseous nitrogen. These findings show that the P. rettgeri strain YL has potential application in wastewater treatment for nitrogen removal under sole aerobic conditions.

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