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Assessment of membrane processing plant for whey concentration in ovine dairy industry

Murgia, Lelia and Murittu, Gavino and Piras, A. and Pazzona, Antonio Luigi (2009) Assessment of membrane processing plant for whey concentration in ovine dairy industry. In: 23. CIOSTA-CIGR 5. Conference 2009: Technology and management to ensure sustainable agriculture, agro-systems, forestry and safety, 17-19 June 2009, Reggio Calabria, Italy. Reggio Calabria, DISTAFA / ARTEMIS. Vol. 1. p. 2077-2082. ISBN 978-88-7583-031-2. Conference or Workshop Item.

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Abstract

Decrease of pollution potential, volume reduction and recovery of valuable components are the key aspects that are concerned with the economical convenience of whey processing technologies. Among membrane applications, reverse osmosis (RO) can be effectively used for achieving the separation of salt, protein and and lactose from whey and deproteinized whey (scotta). This study reports the operational results of a polymeric membrane continuous system, based on RO technology, recently installed in a sheep cheese factory which produces a total volume of 22 millions liters of scotta per year. Energy requirements and economical performances have been also evaluated in comparison to the previous management practices. Plant processing capacity, with a pressure level set at 35 bars, was about 10,000 L h-1, while the volume concentration ratio (VCR) was on average 2.8. In comparison to raw scotta, the concentration process decreased the costs associated to transport and refrigeration, while the selling price of retentate was higher. While the RO treatment of scotta required an average cost of 0.008 € L-1, the use of this technology generated a positive income of about 70,000 € per year. Permeate resulting from membrane processing (roughly 63% of the initial whey volume) which COD=700-800 mg L-1 was much lower than dairy wastewaters, could be further processed by RO to produce and recycle purified water.

Item Type:Conference or Workshop Item (Poster)
ID Code:7761
Status:Published
Uncontrolled Keywords:Ovine whey, sheep dairy industry, membrane processing, reverse osmosis
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/09 Meccanica agraria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > F.lli Pinna Industria casearia, Thiesi
001 Università di Sassari > 01 Dipartimenti > Ingegneria del territorio
Publisher:DISTAFA / ARTEMIS
ISBN:978-88-7583-031-2
Deposited On:11 Jul 2012 11:07

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