Multilevel contact oxidation treatment of brewery wastewater using spiral biological carriers and their nitrogen removal mechanism

Tianlong Zheng, Peng Li, Chuanfu Wu, Qunhui Wang, Xuesong Li, Hengyu Ai and Ariunbileg Sharavsambuu

International Journal of Environmental Technology and Management, 2015, vol. 18, issue 1, 30-43

Abstract: In this study, spiral biological carriers were used to treat brewery wastewater in a multilevel contact oxidation process. The optimal operational conditions are the following: hydraulic retention time of 6.5 h; temperature of above 21°C; pH of 7.2; and dissolved oxygen concentration ranges of 4.0-6.0 mg/L, 3.0-4.0 mg/L, 2.0-3.0 mg/L, and 2.0-3.0 mg/L in four contact oxidation tanks, respectively. Under the optimal conditions, the removal efficiencies of total nitrogen, ammonia, and COD_cr of the system were 77.0%, 87.6%, and 92.2% respectively. Effluent quality met the discharge standard of pollutants for the beer industry (GB 19821-2005). In addition, the aerobic-anoxic micro-and macro-environments were formed in the spiral biological carriers. This could be explained by the specific surface character and three-dimensional spiral structure of these carriers which strengthened the simultaneous nitrification and denitrification (SND) process. The removal efficiency of total nitrogen of the reactor was up to 82.4%.

Keywords: brewery wastewater; environmental technology; multilevel contact oxidation treatment; nitrogen removal; spiral biological carriers; nitrification; denitrification; SND; wastewater treatment. (search for similar items in EconPapers)
Date: 2015
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