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Direct contact membrane distillation for the concentration of saline dairy effluent

Kezia, K, Lee, J, Weeks, M and Kentish, S (2015) Direct contact membrane distillation for the concentration of saline dairy effluent Water Research, 81. pp. 167-177.

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The ability of direct contact membrane distillation to concentrate the waste effluent from salty whey, a by-product from the cheese making industry has been investigated. The effect of trace protein in the feed, cross-flow velocity and feed acidity were the factors examined. Flat Sheet PTFE membranes of nominal pore sizes 0.05, 0.22 and 0.45 μm were utilised. A decline in feed flux in the presence of trace protein in the feed was observed, but liquid penetration through the membrane could still be prevented by utilization of a membrane of smaller pore size, to achieve a final total solids concentration of ±30% w/w with water recovery from 37 to 83 %. The pressure-drop across the channel length was also predicted accounting for the feed spacer. To increase the channel length up to 1 m will require operation using the smallest pore size of 0.05 μm, unless very low cross-flow velocities are used. The fouling of the membrane is primarily governed by precipitation of a calcium phosphate salt. However, operation at low pH does not improve the flux or the final salt concentration significantly.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Kezia, K
Lee, J
Weeks, M
Kentish, S
Date : 15 September 2015
DOI : 10.1016/j.watres.2015.05.042
Additional Information : Item not available from this repository
Depositing User : Symplectic Elements
Date Deposited : 18 Jul 2016 15:19
Last Modified : 31 Oct 2017 17:50

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