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Appl. Sci. 2018, 8(12), 2694;

Management of Waste Streams from Dairy Manufacturing Operations Using Membrane Filtration and Dissolved Air Flotation

Department of Food, Agriculture and Biological Engineering, 590 Woody Hayes Drive, Columbus, OH 43210, USA
Department of Food Science and Technology, 2015 Fyffe road, Columbus, OH 43210, USA
Author to whom correspondence should be addressed.
Received: 27 November 2018 / Revised: 11 December 2018 / Accepted: 14 December 2018 / Published: 19 December 2018
(This article belongs to the Special Issue Membrane Separation Techniques – Optimization and Application)
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Membrane filtration can provide a significant role in the management of waste streams from food manufacturing operations. The objective of this research was to evaluate the reductions in the organic content of waste streams accomplished when using membrane filtration. Reductions in Chemical Oxygen Demand (COD) by membrane filtration were compared to a Dissolved Air Floatation (DAF) system. Membranes with six different pore sizes (200, 20, 8, 4, 0.083, and 0.058 kDa) were evaluated. In addition, the various membrane treatments were applied after the DAF as an additional level of comparison. The DAF treatment provided 75.15 ± 3.95% reduction in COD, and the reduction in COD improved from 85% to 99% as the membrane pore size decreased. When all membranes were used after a DAF pre-treatment, a reduction in COD to less than 1200 ppm in the permeate stream was achieved. These reductions were independent of the COD in the feed stream. The membrane fouling rates were evaluated for the membranes with the four largest pore-sizes membranes. The membranes with 20 kDa pore-size had the lowest fouling rates during extended fouling-rate studies. View Full-Text
Keywords: membrane filtration; fouling; dairy wastewater membrane filtration; fouling; dairy wastewater

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Nagappan, S.; Phinney, D.M.; Heldman, D.R. Management of Waste Streams from Dairy Manufacturing Operations Using Membrane Filtration and Dissolved Air Flotation. Appl. Sci. 2018, 8, 2694.

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