Partial nitrification treatment for high ammonium wastewater from magnesium ammonium phosphate process of methane fermentation digester liquor

Journal of Bioscience and Bioengineering
Sen QiaoKenji Furukawa

Abstract

This study investigated partial nitrification treatment of methane fermentation digester liquor effluent from magnesium ammonium phosphate precipitation process in a swim-bed reactor. The reactor was operated at a temperature of 35 degrees C and pH between 7.5 and 7.8. Partial nitrification was achieved at the onset of the experiments even though conventional activated sludge was used as seed sludge. The maximum nitrite production rate was 1.0 kg NO(2)-N/m(3)/d at a nitrogen loading rate of 2.0 kg-N/m(3)/d. The average effluent NO(2)-N/NH(4)-N ratio and the effluent NO(3)-N concentration were 1.04+/-0.34 and 5.7 mg/l, respectively, during the stable experiment periods. After 150 days of operation, the sludge volume index value decreased to 15 ml/g and the mean particle size of suspended sludge increased by approximately 3 times from 80 to 260 mum. Comparison of mineral analysis between the seed sludge and the partial nitrification sludge demonstrated that the mineral content of the latter increased approximately three-fold in comparison to that of the former. High Ca concentration was considered to be closely related to dense floc formation and superior settleability of the sludge. Both DGGE and DNA clone analysis verified that...Continue Reading

References

Jul 19, 2005·Journal of Colloid and Interface Science·Shigeru SugiyamaNaoya Shigemoto
Jan 13, 2006·Bioprocess and Biosystems Engineering·Jinwook ChungWookeun Bae
Oct 10, 2006·Applied Microbiology and Biotechnology·Yongzhen Peng, Guibing Zhu
Feb 6, 2009·Environmental Science & Technology·Tuba H ErguderWilly Verstraete

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Citations

Feb 26, 2013·Applied Microbiology and Biotechnology·Marina ArnaldosKrishna R Pagilla
Oct 12, 2010·Journal of Hazardous Materials·Guangjing XuSitong Liu
Apr 23, 2015·Letters in Applied Microbiology·Y-Q LiuP Zeng

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