Abstract A polypropylene membrane contactor was used for the recovery of dissolved methane from an anaerobic reactor effluent. Effect of operational parameters, operation mode and fouling on long-term operation was studied using vacuum pressure or N 2 as sweep gas. Results were analyzed based on the mass transfer estimations. Lower performance was observed in the shell-side mode due to the lower liquid velocity and the probable channeling. Membrane pore wetting was observed with the increase in Q L in the vacuum-pressure mode. This was confirmed with mass transfer resistance analysis, resulting in an estimated wetted pore fraction of between 0.25 and 0.53. The highest removal efficiencies were obtained with the liquid flowing in the lumen side and sweep-gas operation (between 98% and 67% for Q L between 4.1 and 27.2 L h –1 ), with negligible effect of the N 2 flow rate. In the long-term operation, the impact of membrane fouling was less intense in the lumen side, with longer operation time and more reversible fouling. A complete characterization of the fouling based on water sample analysis concluded that both inorganic and organic foulants were present, probably with higher biofouling presence. A combination of water and chemical cleanings resulted in a recommended protocol based on daily water cleaning.

中文翻译：

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从厌氧废水中回收溶解甲烷的聚丙烯膜接触器的性能：传质评估、长期运行和清洁策略

摘要 聚丙烯膜接触器用于从厌氧反应器流出物中回收溶解的甲烷。使用真空压力或N 2 作为吹扫气，研究了操作参数、操作模式和污垢对长期操作的影响。结果基于传质估计进行分析。由于较低的液体速度和可能的沟道效应，在壳侧模式中观察到较低的性能。在真空压力模式下，随着 QL 的增加，观察到膜孔润湿。这通过传质阻力分析得到证实，导致估计的润湿孔隙分数介于 0.25 和 0.53 之间。液体在管腔侧流动和吹扫气体操作获得最高去除效率（对于 4.1 和 27.2 L h –1 之间的 QL，在 98% 和 67% 之间），N 2 流速的影响可以忽略不计。在长期运行中，膜污染对管腔侧的影响较小，运行时间更长，污染可逆性更强。基于水样分析对污垢的完整表征得出结论，无机和有机污垢都存在，可能存在更高的生物污垢。水和化学清洁的组合产生了基于日常水清洁的推荐方案。