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化工学报  2014 

短程混凝-膜过滤工艺清洗过程中气液两相流对絮体形成的影响

DOI: 10.3969/j.issn.0438-1157.2014.04.012, PP. 1236-1242

Keywords: 混凝-膜过滤,混凝动力学,气液两相流,曝气,数值模拟

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Abstract:

基于数值模拟的方法研究了不同填充密度和不同曝气强度下短程混凝-膜过滤工艺中膜清洗过程反应器内流场特性。结合絮凝动力学理论,引入微涡旋尺度参数来判定影响絮体形成的流场状态,以评估膜清洗过程中曝气强度对絮体形成及膜清洗效果的影响,并用实时图像技术对模拟结果进行验证。研究结果表明,反应器填充密度为7.38%,气水比为15:1时,反应器内平均有效能耗适中,且形成的微涡旋尺度也适中,不会对絮体产生明显的破坏作用,有利于形成较大尺寸的絮体;同时在膜组件附近产生较强的水流剪切速度,使膜面得到有效的清洗。结合实验分析,反应器填充密度为7.38%,气水比为15:1时,反应器内形成的絮体粒径较大且与数值模拟得到的微涡旋尺度相近,上清液UV254和TOC值最低,去除效果最好。

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