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Membrane filtration for recovery in dairies


Karsten Lauritzen looks at four different recovery applications where membrane technology is used.


P


rotection of the environment and the reuse of resources are


in great focus these days, and environmental awareness has become essential to the dairy industry, who is putting still more attention to green image and sustainability.


Focus can be on many different factors in the production, such as raw materials, water, chemicals, and waste. Membrane filtration has proven to be a powerful technology for solving many of the challenges facing the dairy industry.


Water recovery Today, water is an important but not unlimited resource in the dairy industry. In consequence,


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reverse osmosis (RO) has become an important technology for recovery of water from products or streams. In addition, recovery of condensate from evaporators is a well documented application, which enables the dairy to reduce the intake of well water by running condensate through an RO system.


RO technology has also proven helpful for concentration of product prior to evaporation or transportation. In this case the product, which can be whey or milk, is concentrated by removing water, which can be used for cleaning or other process steps. Like condensate recovery, this process will reduce the intake of well water and will have a significant impact on reduction of transportation costs, if the product


Above Caustic before and after recovery.


is to be transported to another production site.


Milk recovery Milk Recovery is defined as concentration of the intermediate phase of a flush, where flush water and milk is mixed. Te intermediate phase is therefore diluted milk that ends up in the waste water, wasting the value of the solids contained. DSS has developed a membrane based technology, where the intermediate phase is collected in a silo and the total solids content is concentrated to that of the original milk (approximately 9–13 per cent DM) by removing water by means of RO. Consequently, the dairy optimises use of the raw material (milk), and reduces the environmental load


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