The energy consumption analysis of bubble SBR and bubble-stirring SBR for aerobic sludge granulation
FAN Wen-wen1,2, YUAN Lin-Jiang2, MA Yuan-Zheng1, HUANG-Hao1
1. School of Energy and Architecture, Xi'an Aeronautical University, Xi'an 710077, China; 2. Key Laboratory of Environmental Engineering, Shanxi Province, Key Laboratory of Northwest Water Resources Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：The mean diameter, fractal dimension and microorganism characteristics during aerobic sludge granulation were investigated under bubble SBR with height-diameter ratio of 20 and bubble-stirring SBR with height-diameter ratio of 1.2. A computational fluid dynamics model was established to compare and analyze the energy consumption of conventional activated sludge and aerobic granular sludge in different reactors. The reasons for the differences in the characteristics of the two reactors were analyzed. The aerobic granular sludge with a mean diameter of 0.604mm. an average sedimentation rate of (24±5.8)m/h, a SVI of 36.33mL/g, a MLSS of about 4500mg/L and a smooth surface was formed under the condition of superficial gas velocity of 2.0cm/s in the bubble SBR. Under the conditions of stirring speed of 300r/min and superficial gas velocity of 1.05cm/s, the aerobic granular sludge were successfully formed with filamentous bacteria entangling on the surface of granules in the bubble-stirring SBR. The mean sludge diameter was up to 1.123mm, the average sedimentation rate of sludge was (19.6±5.1)m/h, SVI was 41.33mL/g, and MLSS was about 3300mg/L. The comparative analysis of energy consumption conventional between activated sludge and aerobic granular sludge showed that the turbulent kinetic energy of the bubble-stirring SBR was about 100times that of the bubble SBR at the activated sludge stage due to the addition of agitation. However, after the formation of aerobic granules, the turbulent kinetic energy in the upper part of the bubble SBR increased significantly, and the magnitude of the turbulent kinetic energy was larger than that of the bubble-stirring SBR. In comparison, the bubble SBR was relatively energy efficient.
范文雯, 袁林江, 马远征, 黄浩. 鼓泡和鼓泡-搅拌SBR好氧污泥颗粒化能耗分析[J]. 中国环境科学, 2021, 41(7): 3229-3237.
FAN Wen-wen, YUAN Lin-Jiang, MA Yuan-Zheng, HUANG-Hao. The energy consumption analysis of bubble SBR and bubble-stirring SBR for aerobic sludge granulation. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3229-3237.
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