Mitigation of Flux Decline in the Cross-Flow Nanofiltration of Molasses Wastewater under the Effect of Gas Sparging
Autor: | Kaushik Nath, Tejal M. Patel |
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Rok vydání: | 2014 |
Předmět: | |
Zdroj: | Separation Science and Technology. 49:1479-1489 |
ISSN: | 1520-5754 0149-6395 |
Popis: | Gas sparging has been shown to significantly affect the performance of nanofiltration of molasses wastewater using a hydrophilized polyamide membrane (molecular weight cut-off 250) in a flat sheet module. Sparging of nitrogen at two different gas velocities was capable of appreciable alleviation of permeate flux decline over a period of time under the present experimental conditions when compared with the conventional unsparged nanofiltration. Critical flux (Jcrit), limiting flux (Jlim), and shear stress number (Ns) were determined at different cross-flow velocities for both the cases in the presence and absence of gas sparging. Increase in Ns with increasing cross-flow velocity was more pronounced in presence of gas sparging. Almost 1.5-2 fold increase in Ns was observed using cross-flow velocity of 0.8 ms−1 with gas sparging, compared to the case of “no sparging.” However, there was no significant improvement of rejection behavior of the solutes in presence of gas sparging. The value of mass transfer co... |
Databáze: | OpenAIRE |
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