Membrane defouling using microbubbles generated by fluidic oscillation
Membrane defouling using microbubbles generated by fluidic oscillation
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DOI：
10.2166/ws.2018.056
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发表时间：
2019-02-01
期刊：
影响因子：
1.7
通讯作者：
Zimmerman, William B.
中科院分区：
文献类型：
--
作者：
Harun, M. H. C.;Zimmerman, William B.
杂质和胶体物质是降低废水处理中使用的膜过滤性能的多种结垢条件中的两种。本研究研究了流体振荡产生的微泡 (MB) 清除过滤膜污垢的潜力。使用从赫尔沿海地区收集的表层海水对孔径为 1 μm 的微滤 (MF) 滤筒过滤器进行污染。海水以5.8L/min循环，促使胶体物质沉积在膜表面。记录的穿过膜过滤器的进料通道压降 (Delta P) 显示在循环的前 8 小时内发生了快速结垢。在接下来的 8 小时内观察到 Delta P 的波动，表明胶体填充了膜的孔，并在 2 小时内保持稳定，表明膜完全被污染。使用流体振荡器产生的 MB 对过滤膜进行清洁和除垢。用1L/min的空气吹扫污染的膜约1至约2小时以除去膜表面上沉积的胶体和杂质。通过扫描电子显微镜 (SEM)、UV254 和电导率 (EC) 计对膜进行分析，显示 MB 介导的膜表面沉积胶体颗粒去除的程度。本研究发现，由射流振荡器（封闭排气口）产生的 MB 的除污率最高，其次是由射流振荡器（开放排气口）产生的 MB 和不使用射流振荡器产生的 MB，分别为 9.53、6.22 和 3.41 mbar/min。
Impurities and colloidal substances are two of many fouling conditions that reduce the membrane filtration performance used in wastewater treatment. This study investigates the potential of fluidic-oscillation-generated microbubbles (MBs) to defoul the filtration membrane. Cartridge filters for microfiltration (MF) of 1 mu m pore size were fouled using surface seawater collected from the Hull coastal area. The seawater was circulated at 5.8 L/min to actuate colloidal substance deposition on the membrane surface. The recorded feed channel pressure drop (Delta P) across the membrane filters showed rapid fouling occurred in the first 8 hrs of the circulation. Fluctuations of Delta P during the next 8 hrs were observed showing the colloids filling the pores of the membrane, and remaining steady for 2 hrs showing the membrane was completely fouled. The filtration membrane was cleaned and defouled using fluidic-oscillator-generated MBs. The fouled membranes were sparged with 1 L/min of air scouring for similar to 1 to similar to 2 hrs to remove the deposited colloids and impurities on the surface of the membrane. The membrane, analysed by Scanning Electron Microscopy (SEM), UV254 and Electrical Conductivity (EC) meter, showed the extent of MBs-mediated removal of the deposited colloidal particle from the membrane surfaces. This study found that the highest defouling rate occurs with MBs generated by fluidic oscillator (closed vent), followed by MBs generated by fluidic oscillator (opened vent) and MBs generated without fluidic oscillator at 9.53, 6.22, and 3.41 mbar/min, respectively.