Membrane aging effects on water recovery during full-scale potable reuse: Mathematical optimization of backwashing frequency for constant-flux microfiltration
Membrane aging effects on water recovery during full-scale potable reuse: Mathematical optimization of backwashing frequency for constant-flux microfiltration
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DOI：
10.1016/j.seppur.2021.120294
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发表时间：
2022-01-20
影响因子：
8.6
通讯作者：
Chellam, Shankararaman
中科院分区：
文献类型：
--
作者：
Cogan, N. G.;Ozturk, Deniz;Chellam, Shankararaman
解决日益严重的缺水问题的一个手段是城市废水回收，以生产饮用水。微滤（MF）是饮用水再利用的核心技术，因为它在去除病原性原生动物，细菌和其他胶体以及反渗透预处理方面非常有效。然而，由于微滤材料在膜表面积聚，其生产率降低，需要定期去除污垢。在中空纤维过滤的背景下描述了MF的数学模型，其重点是优化具有反冲洗的恒定通量操作。设计曲线也被提出用于确定延迟时间。该模型分析评估对现实世界的MF污染膜的年龄范围从几周到三年，观察到在世界上最大的水回用设施经营的橙子县水务区。所提出的模型比较以及与全规模的操作数据，模型参数准确地捕捉污染动力学与膜年龄的变化，提供线索的最佳再生时间和频率的变化，膜性能下降，在很长的时间尺度。
One tool in efforts to tackle the ever growing problem of water scarcity is municipal wastewater reclamation to produce drinking water. Microfiltration (MF) is a central technology for potable reuse because it is highly effective in removing pathogenic protozoa, bacteria, and other colloids and for reverse osmosis pretreatment. However, as microfiltered materials accumulate at the membrane surface, its productivity is reduced requiring periodic removal of foulants. A mathematical model of MF is described in the context of hollow fiber filtration that focused on optimizing constant flux operation with backwashing. Design curves were also proposed for determining backwash timing. The model analysis is evaluated against real-world MF fouling for membranes that range in age from a few weeks to three years, observed at the world's largest water reuse facility operated by the Orange County Water District. The presented model compares well with the full-scale operational data, and model parameters accurately capture variations in fouling kinetics with membrane age, providing clues to changes in optimal regeneration timing and frequency as membrane performance declines over long time scales.