Semi-nitritation process producing optimum influent for anammox process in treatment of domestic wastewater
Xiaoxue Tang1, Qing Yang2, Jianlin Li3
1Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China; China Academy of Building Research, Beijing 100013, PR China.
Abstract:
The process of anaerobic ammonium oxidation (Anammox) requires a proper ratio of NH4(+)-N and NO2(-)-N in the influent, which is difficult to control upon treating domestic wastewater. In this study, a control strategy of semi-nitritation (SN) process based on monitoring the pH profile and NH4(+)-N concentration in a sequencing batch reactor (SBR) was developed. The aeration time of each cycle in SN-SBR was calculated using the established equation tSN=tCOD+0.56αnS0/(S0-Sn). To verify the suitability of the control strategy, SN-SBR was operated continuously for 20 cycles, fed with real domestic wastewater with a fluctuating COD of 200-400 mg L(-1) and NH4(+)-N of 65-80 mg L(-1). The nitrogen removal performance of SN-anammox system using the developed control strategy was also monitored. Results showed that SN-SBR was able to generate a suitable ratio of NH4(+)-N to NO2(-)-N for the following anammox process, the TN removal rate of the SN-anammox system achieved 91.7 ± 0.4% and the average ammonium, nitrite and nitrate concentration of effluent was only 0.50 ± 0.24, 0.13 ± 0.09 and 4.9 ± 0.22 mg L(-1), respectively. This study has potential application in the treatment of domestic wastewater using combined SN-anammox process.
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