PMID: 15242117Jul 10, 2004Paper

Nitrogen removal via nitrite from seawater contained sewage

Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Yongzhen PengGuibing Zhu

Abstract

Under the control of both pH and the concentration of free ammonia (FA), the nitrification-denitrification via nitrite pathway was accomplished in SBR to achieve enhanced biological nitrogen removal from seawater contained wastewater, which is used to flush toilet, under relatively high salinity. Several parameters including salinity, temperature, pH, and NH4+-N loading rate were studied to evaluate their effects. The results indicate that at different salinity the nitrogen removal efficiency is relative to ammonia-nitrogen loading rate. The nitrogen removal efficiency reaches above 90% when the NH4+-N loading does not exceed 0.15 kg NH4+-N/kg MLSS d. With the salinity increasing, the ammonia-nitrogen loading rate should be lowered to obtain high removal efficiency. The evaluation of temperature effect shows that nitrogen removal efficiency is promoted twice when reaction temperature is elevated from 20 to 30 degrees C. Moderately high pH in the range of 7.5-8.5 has advantage to achieve effective nitrification-denitrification via nitrite, the process of which is caused by the selective inhibition of free ammonia (FA).

Citations

Jul 28, 2010·Applied Biochemistry and Biotechnology·Liang WangCurtis Miller
Apr 16, 2015·Journal of Environmental Sciences (China)·Meryem JemliSami Sayadi
Oct 10, 2006·Applied Microbiology and Biotechnology·Yongzhen Peng, Guibing Zhu

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