A new model based on the cake removal and the re-deposition mechanism in the rinsing process

Qiao, Zhaoyu; Wang, Zhan; Guo, Yangyang

doi:10.1016/j.memsci.2021.119560

Cited by 10 publications

(1 citation statement)

References 42 publications

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“…17 & 18 are the experimental resistances measured according to the membrane cleaning procedure (Appendix B, supplementary material). Our study was based on the assumption[44][45][46][47] that the cake resistance (Rc) was removed by circulating the RO water through the membrane, and internal resistance (Ri) (due to the internal trapped oil within the ceramic membrane pores) was cleaned by alkaline/acid cleaning. Membrane ceramic resistance (Rm) is calculated based on the permeability test of the new membrane (Appendix C, supplementary material),…”

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confidence: 99%

Experimental Investigation of the Novel Periodic Feed Pressure Technique in Minimizing Fouling during the Filtration of Oily Water Systems using Ceramic Membranes

Echakouri¹,

Salama²,

Henni³

2022

Preprint

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Fouling represents a bottleneck problem for promoting the use of membranes in filtration and separation applications. It becomes even more persistent when it comes to the filtration of fluid emulsions. In this case, a gel-like layer that combines droplets, impurities, salts, and other materials form at the membrane's surface, blocking its pores. It is, therefore, a privilege to combat fouling by minimizing the accumulation of these droplets that work as seeds for other incoming droplets to cluster and coalesce with. In this work, we explore the use of the newly developed and novel periodic feed pressure technique (PFPT) in combating the fouling of ceramic membranes upon the filtration of oily water systems. The PFPT is based on alternating the applied transmembrane pressure (TMP) between the operating one and zero. A PFPT cycle is composed of a filtration half-cycle and a cleaning half-cycle. Permeation occurs when the TMP is set at its working value, while the cleaning occurs when it is zero. Three PFPT patterns were examined over two feeds of oily water systems with oil contents of 100 and 200ppm, respectively. The results show that the PFPT is very effective in minimizing the problem of fouling compared to a non-PFPT normal filtration. Furthermore, the overall drops in permeate flux during the cleaning half cycles are compensated by appreciable enhancement due to the significant elimination of fouling development such that the overall production of filtered water is even increased. Inspection of the internal surface of the membrane post rinsing at the end of the experiment proves that all PFPT cycles maintained the ceramic membranes as clean after a 2-hours operation. This can ensure a prolonged lifespan of the ceramic membrane use and a continuous greater permeate volume production. The advantage of the PFPT is that it can be implemented on existing units with minimal modification, ease of operation, and saving energy.

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confidence: 99%