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Membranes 2017, 7(4), 55; doi:10.3390/membranes7040055

Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes

1
Institute for Sustainability and Innovation, College of Engineering and Science, Victoria University, Werribee Campus, P. O. Box 14428, Melbourne 8001, Australia
2
Institute of Environmental Science, University of Rajshahi, Rajshahi 6205, Bangladesh
3
Pinches Consolidated Industries, 21 Malua Street, Reservoir, Victoria 3073, Australia
*
Author to whom correspondence should be addressed.
Received: 3 June 2017 / Revised: 28 August 2017 / Accepted: 19 September 2017 / Published: 29 September 2017
(This article belongs to the Special Issue Membrane Technology in Food Processing Industry)
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Abstract

Meat rendering operations produce stick water waste which is rich in proteins, fats, and minerals. Membrane distillation (MD) may further recover water and valuable solids, but hydrophobic membranes are contaminated by the fats. Here, commercial hydrophobic polytetrafluorethylene (PTFE) membranes with a hydrophilic polyurethane surface layer (PU-PTFE) are used for the first time for direct contact MD (DCMD) on real poultry, fish, and bovine stick waters. Metal membrane microfiltration (MMF) was also used to capture fats prior to MD. Although the standard hydrophobic PTFE membranes failed rapidly, PU-PTFE membranes effectively processed all stick water samples to colourless permeate with sodium rejections >99%. Initial clean solution fluxes 5–6 L/m2/h declined to less than half during short 40% water recovery tests for all stick water samples. Fish stick water uniquely showed reduced fouling and up to 78% water recovery. Lost flux was easily restored by rinsing the membrane with clean water. MMF prior to MD removed 92% of fats, facilitating superior MD performance. Differences in fouling between stick waters were attributed to temperature polarisation from higher melt temperature fats and relative proportions to proteins. Hydrophilic coated MD membranes are applicable to stick water processing but further studies should consider membrane cleaning and longer-term stability. View Full-Text
Keywords: stick water; meat industry; membrane microfiltration; membrane distillation stick water; meat industry; membrane microfiltration; membrane distillation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mostafa, M.G.; Zhu, B.; Cran, M.; Dow, N.; Milne, N.; Desai, D.; Duke, M. Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes. Membranes 2017, 7, 55.

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