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Dissolved Methane Harvesting Using Omniphobic Membranes for Anaerobically Treated Wastewaters
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-03-11 , DOI: 10.1021/acs.estlett.9b00076 Xuesong Li 1 , Abhishek Dutta 1 , Qirong Dong 2 , Sasha Rollings-Scattergood 3 , Jongho Lee 1
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-03-11 , DOI: 10.1021/acs.estlett.9b00076 Xuesong Li 1 , Abhishek Dutta 1 , Qirong Dong 2 , Sasha Rollings-Scattergood 3 , Jongho Lee 1
Affiliation
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Dissolved biomethane in anaerobic effluents has long been a hurdle for energy harvesting through anaerobic wastewater treatment processes. Here, we present a novel membrane process for dissolved methane recovery through the normal range of domestic wastewater temperatures by utilizing an omniphobic (nonwetting) microporous membrane. In a process driven by a solubility gradient, dissolved methane is extracted from a methane-rich aqueous solution (feed), transported across the omniphobic membrane, and absorbed into a nonpolar organic solvent (draw) that has a high solubility for methane. We fabricated the omniphobic membrane by coating a microporous polymeric membrane with silica nanoparticles, followed by surface fluorination. Using the omniphobic membrane, we demonstrate that nearly ≥90% of dissolved methane is recovered from methane-saturated feedwater at 15, 25, and 35 °C, simulating anaerobic effluents produced in the psychrophilic to mesophilic temperature range, while negligible transport of water is observed. Further measurements and comparative energy analysis suggest that this novel process can enable net energy production, with a higher value at a lower temperature, which outperforms other dissolved methane recovery techniques.
中文翻译：
使用厌氧膜处理厌氧处理废水后的溶解甲烷收获
长期以来，厌氧废水中溶解的生物甲烷一直是通过厌氧废水处理过程收集能量的障碍。在这里，我们介绍了一种利用全疏水性（不润湿）微孔膜在正常生活污水温度范围内回收溶解甲烷的新型膜工艺。在溶解度梯度驱动的过程中，从富含甲烷的水溶液（进料）中提取溶解的甲烷，将其输送通过全疏水膜，然后吸收到对甲烷具有高溶解度的非极性有机溶剂（提取液）中。我们通过用二氧化硅纳米颗粒涂覆微孔聚合物膜，然后进行表面氟化，来制造全疏水膜。使用全疏水膜 我们证明，在15、25和35°C下，从甲烷饱和的给水中回收了几乎≥90％的溶解甲烷，模拟了从嗜温到中温的温度范围内产生的厌氧废水，而水的迁移却可以忽略不计。进一步的测量和比较的能量分析表明，该新工艺可以在较低的温度下以更高的值生产净能量，这胜过其他溶解甲烷的回收技术。
更新日期：2019-03-11
中文翻译：
使用厌氧膜处理厌氧处理废水后的溶解甲烷收获
长期以来，厌氧废水中溶解的生物甲烷一直是通过厌氧废水处理过程收集能量的障碍。在这里，我们介绍了一种利用全疏水性（不润湿）微孔膜在正常生活污水温度范围内回收溶解甲烷的新型膜工艺。在溶解度梯度驱动的过程中，从富含甲烷的水溶液（进料）中提取溶解的甲烷，将其输送通过全疏水膜，然后吸收到对甲烷具有高溶解度的非极性有机溶剂（提取液）中。我们通过用二氧化硅纳米颗粒涂覆微孔聚合物膜，然后进行表面氟化，来制造全疏水膜。使用全疏水膜 我们证明，在15、25和35°C下，从甲烷饱和的给水中回收了几乎≥90％的溶解甲烷，模拟了从嗜温到中温的温度范围内产生的厌氧废水，而水的迁移却可以忽略不计。进一步的测量和比较的能量分析表明，该新工艺可以在较低的温度下以更高的值生产净能量，这胜过其他溶解甲烷的回收技术。
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