EURO-ECO 2010 Hanover 2 - 3 Dezember 2010	Environmental, Engineering - Economic and Legal Aspects for Sustainable Living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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Now days the resource saving and environmental problems, are more actual than ever especially in the brewing industry, which is characterized by a large content of liquid and solid wastes, where the suspension of the residual yeasts is about 2% of the volume of the produced beer. The slurry is deposited in a cone of cylinder-conical tanks, during fermentation and alter-fermentation processes and a larger part of this substance is not subjected to further processing. The concentrate of brewer’s yeasts is a source of bioorganic-organic compounds characterized by the values of biochemical oxygen demand (BOD) comparable with the pollution of petrochemical industries. But the brewing industry wastes under investigation are a rich source of vitamins, amino acids, proteins, mineral substances, which can be used as a feed additive in the manufacture of medicines and veterinary medicine, product and in the food industry as well as a valuable nutritional additive. It should be also noted that the residual brewer’s yeast contain about 50% of the beer, which can be recovered and returned to production line a set of measures for the brewing industry wastes utilization will enable us not only to reduce man-made pressures on the environment, but also to obtain additional quantities of final product (beer) and but also a complex of biologically active compounds as well

The membrane filtration is one of the most effective methods for extracting high-molecular bioorganic compounds from aqueous systems. One of such technologies is cross – flow filtration, which allows filtering the liquid high-level suspensions to a filtrate sterile a rate. Significant advantage of this type of filtration is a conservation of integral structure of recuperated from the wastes yeast cells and high quality products manufactured from them.

A unique pilot unit to run the process of micro-filtration separation of food media in a centrifugal continuous is mode has been designed by our group. The main block of the pilot plant is a module consisting of a tubular ceramic membrane filters. The operating principle of this pilot unit is-to pump the fluid flow under excess pressure along the membrane surface. The dynamic force of the moving fluid flow brings back settled on the membrane suspension particles in the liquid under filtration and the filtration occurs due to a high rate of flow and seeping of the liquid through the pores inside the membrane due - to different pressure in the intertube space of the membrane, suspension and filtrate. Part of the liquid (permeate) seeps through the membrane and is thus filtered, and the other part of the liquid (retentate), is taken in the circulation tank, and then its recycling cycle is repeated until it achieves the required dry matter content.

Thus, the original design of the membrane filtration apparatus makes a continuous process, quite possible with a self-cleaning filter element. This is a single-stage filtration process that does not require any additional auxiliary materials, in fully automatic mode with a programmed result and the possibility of using membrane filters from different manufacturers. Consequently, the application of this method will improve the ecological-situation in the company affected zone and can make additional profits due to the brewer’s yeast concentrate and separated beer, which can be returned to production line.