SUN Jian-yu,LEI Ting,LIANG Peng,et al.Application and Optimization of Pulse Aeration in Large-scale Membrane Bioreactor[J].China Water & Wastewater,2021,37(9):100-104.
脉冲曝气在大型膜生物反应器工程中的应用与优化
- Title:
- Application and Optimization of Pulse Aeration in Large-scale Membrane Bioreactor
- Keywords:
- membrane bioreactor; pulse aeration; membrane fouling; optimization
- 摘要:
- 基于某大型膜生物反应器（MBR）城市污水处理工程，开展了膜池脉冲曝气的应用与优化研究，旨在为该工程提供最优的曝气条件，并揭示不同曝气强度下膜池混合液特性与膜污染情况的变化规律。结果表明，当总曝气量由13 000 m3/h上升至17 000 m3/h时，膜比通量先上升后下降。曝气量的增大导致污泥混合液粒径减小，疏松的污泥胞外聚合物（LB-EPS）浓度下降，上清液有机物浓度上升，致使膜污染潜势上升。综合比较，该MBR工程膜池的最适曝气条件为中等曝气量（15 000 m3/h），在此工况条件下，膜池内组件的平均比通量达到0.95 L/(m2·h·kPa)。
- Abstract:
- Application and optimization of pulse aeration in membrane tanks were carried out in a large-scale membrane bioreactor (MBR) plant for municipal wastewater treatment, which aimed to determine the optimal aeration parameters for the project and to reveal the variation rule of the mixed liquid characteristics and membrane fouling under different aeration intensities. The specific membrane flux increased first and then decreased in the membrane tanks as the total aeration flow rate increased from 13 000 m3/h to 17 000 m3/h. The increase of aeration flow rate led to smaller particle size of the sludge in mixed liquor, lower organic concentration in loosely bound extracellular polymeric substances (LB-EPS) on sludge and higher organic concentration in supernatant, resulted in higher membrane fouling potential of supernatant. By comprehensive comparison, the optimal aeration rate of the MBR membrane tank was medium aeration rate (15 000 m3/h). Under the optimal condition, the average specific flux of the modules in the membrane tank reached 0.95 L/(m2·h·kPa).
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