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5 results on '"Guo, Yihan"'

4. Insight into the roles of tightly and loosely bound extracellular polymeric substances on a granular sludge in ammonium nitrogen removal

Author

Yuan Ren, Guo Yihan, Lilong Yan, Guoxin Hao, Zhang Xiaolei, Ying Zhang, Xuefei Bao, and Yu Liangbin

Subjects
Environmental Engineering, Nitrogen, 0208 environmental biotechnology, Inorganic chemistry, chemistry.chemical_element, Bioengineering, macromolecular substances, 02 engineering and technology, Wastewater, 010501 environmental sciences, Waste Disposal, Fluid, 01 natural sciences, chemistry.chemical_compound, Biopolymers, Adsorption, Extracellular polymeric substance, Ammonium Compounds, Ammonium, Nitrite, Waste Management and Disposal, Nitrites, 0105 earth and related environmental sciences, Nitrates, Sewage, Renewable Energy, Sustainability and the Environment, Chemistry, technology, industry, and agriculture, General Medicine, 020801 environmental engineering, Aeration, Ammonium nitrogen
Abstract

To explicitly understand the function of extracellular polymeric substances in the treatment of ammonium-nitrogen-rich wastewater using aerobic granular sludge, the three forms of nitrogen (ammonium, nitrite and nitrate nitrogen) contained in tightly and loosely bound extracellular polymeric substances were analyzed. The three forms of nitrogen were monitored in the tightly and loosely bound extracellular polymeric substances in aerobic granular sludge after adsorption. The ammonium nitrogen contained in the extracellular polymeric substances was distributed in both the tightly and loosely bound forms and decreased gradually as the aeration time increased. Ammonium nitrogen remained in the tightly bound extracellular polymeric substances even after aeration was complete. The nitrite and nitrate nitrogen species in the extracellular polymeric substances were mainly present in the loosely bound extracellular polymeric substances. The sources of the three nitrogen forms detected in the extracellular polymeric substances differed relative to the different nitrogen forms.

Published
2016

5. Simultaneous nitrification and denitrification by EPSs in aerobic granular sludge enhanced nitrogen removal of ammonium-nitrogen-rich wastewater

Author

Yan Wen, Yuan Ren, Guoxin Hao, Lilong Yan, Guo Yihan, Zhang Xiaolei, Ying Zhang, and Shaoliang Zhang

Subjects
Environmental Engineering, Denitrification, Time Factors, Nitrogen, 0208 environmental biotechnology, Inorganic chemistry, chemistry.chemical_element, Bioengineering, 02 engineering and technology, 010501 environmental sciences, Nitrosomonas eutropha, Wastewater, 01 natural sciences, chemistry.chemical_compound, Extracellular polymeric substance, Biopolymers, Bioreactors, Ammonium Compounds, Ammonium, Anaerobiosis, Particle Size, Waste Management and Disposal, 0105 earth and related environmental sciences, biology, Bacteria, Sewage, Renewable Energy, Sustainability and the Environment, Chemistry, General Medicine, biology.organism_classification, Nitrification, Aerobiosis, 020801 environmental engineering, Biodegradation, Environmental, Anammox, Batch Cell Culture Techniques, Environmental chemistry, Oxidation-Reduction, Water Pollutants, Chemical
Abstract

In this study, role of extracellular polymeric substances (EPSs) in enhancing nitrogen-removal from ammonium-nitrogen-rich wastewater using aerobic granular sludge (AGS) technology were analyzed. AGS enabled ammonium oxidation and denitrification to occur simultaneously. Air stripping and simultaneous nitrification-denitrification contributed to total-nitrogen removal. Clone-library analysis revealed that close relatives of Nitrosomonas eutropha and heterotrophic denitrifiers were dominant in the AGS, whereas anammox bacteria were not detected. EPSs adsorption of ammonium, nitrite, and nitrate nitrogen results in improved removal of nitrogen in batch experiments.

Published
2015

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