Journal Article

Spectroscopic characterization of DOM and the nitrogen removal mechanism during wastewater reclamation plant

Wang, Di-Hua, Tan, Wen-Bing, Xi, Bei-Dou, Wang, Jin-Sheng, Wang, Xiao-Shu, Cai, Ming-Xuan, Li, Ying-Jun, Li, Tong-Tong, Wang, Lei, Xiong, Ying, Li, Xiang, Zhang, Lie-Yu, Xu, Jian-feng

2017

Overview

The performance of the Sha-he wastewater reclamation plant was evaluated in this study. To remove residual nitrogen after Anaerobic-Anoxic-Oxic (A2O) treatment, three multistage Anoxic-Oxic (A/O) were added to investigate the nitrogen removal efficiency and its mechanism. In addition, the constituents and evolution of dissolved organic matter (DOM) during wastewater reclamation was also investigated using a method combining fluorescence spectroscopy with fluorescence regional integration (FRI). The results suggested that multistage A/O treatment can effectively improve the nitrogen removal ability under low concentrations of carbon sources. The total nitrogen (TN) exhibits significantly positive correlation with fulvic acid-like materials and humic acid-like materials. The correlation coefficient for TN and fulvic acid-like substances (R2 = 0.810, P < 0.01) removal was greater than that of humic acid-like substances (R2 = 0.636, P < 0.05). The results indicate that nitrogen removal may be achieved with the fulvic-like and humic-like substances, and the removal effects were higher by fulvic acid-like substances than humic-like substances, mostly due to that the latter were relatively more difficult to be utilized as carbon source during the nitrogen removal process. The effluent water quality of biological treatment reached the first grade A standard of \"Cities sewage treatment plant pollutant discharge standard\" (GB18918-2002). In addition, the effluent from the membrane bioreactor reached the \"Standards of reclaimed water quality\" (SL368-2006).

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Anaerobic treatment / Biological treatment / Bioreactors / Carbon / Carbon sources / Chemical properties / Civil engineering / Correlation / Correlation coefficient / Correlation coefficients / Dissolved organic matter / Earth Sciences / Ecology and Environmental Sciences / Effluent standards / Effluents / Engineering and Technology / Environmental protection / Environmental science / Fluorescence / Fluorescence spectroscopy / Fulvic acids / Groundwater / Humic acids / Laboratories / Landfill / Leachates / Low concentrations / Methods / Multistage / Nitrogen / Nitrogen removal / Physical Sciences / Pollutants / Reclaimed water / Reclamation / Research and Analysis Methods / Risk assessment / Sewage treatment / Sewage treatment plants / Simulation / Spectroscopy / Studies / Waste treatment / Wastewater / Wastewater disposal / Wastewater renovation / Wastewater treatment / Wastewater treatment plants / Water quality / Water quality standards / Water reclamation / Water treatment