Membrane PSA: [Weekly Topic] {April 12, 2011} What are the differences between membrane separation technologies in wastewater treatment and exhaust gas treatment?
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This post was last edited by Kongfen Zhulong on 2011-4-12 at 20:59. What are the differences between membrane separation technology and other methods in wastewater treatment and exhaust gas treatment? Let’s discuss it!
The membrane processes used in wastewater treatment mainly include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, etc. The operating pressure ranges from a few tenths of an atmosphere to several dozen atmospheres. The membranes used in microfiltration and ultrafiltration are usually porous membranes, while those used in nanofiltration and reverse osmosis are typically dense membranes. Membranes used for wastewater treatment are prone to contamination and must be cleaned regularly. The membrane processes used in exhaust gas treatment mainly include membrane absorption, gas separation, and vapor permeation. Except for membrane absorption, the membranes used are mostly dense membranes, with composite membranes being the most common type; in such membranes, the base membrane is porous, while there is also a dense coating on top of it. Due to the handling of gaseous materials, the membrane is not prone to contamination, and its lifespan is generally high. In terms of mechanism: membrane processes for wastewater treatment are mostly based on screening, whereas exhaust gas treatment relies primarily on dissolution-diffusion
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