J. Inst. Brew. 117(3), 314-328, 2011Kieselguhr or diatomaceous earth is the most commonly used filter aid for beer filtration. However, lately the use of kieselguhr has come under increased criticism. Some of the reasons for this are cost of disposal, limited resources and hazards to health from diatomite powder. One alternative to filtration with kieselguhr could be cellulose. Cellulose can be regenerated several times, is easy to dispose of, bears no health risks and as a renewable raw material is widely available. Previous single filtrations with cellulose were not satisfactory. A pre-clarification of wort and green beer with silica sol was used in this work to improve the haze of the filtered beer. Furthermore, silica sol was added to the cellulose mixture for body-feed during filtration. This represents a new field of application. When adding silica sol, filtrate haze was reduced in both applications. The intensity of this effect was dependent on how, when and where the material is added. Another future alternative could be rice hull ash because of its similarities to kieselguhr.
Abstracts BrewingScience articles (May-June 2010)New International Calibration Standard (ICE-3) for HPLC Analysis of α-and ß-acids. M. Biendl. Submitted on behalf of the International Hop Standards Committee. The International Hop Standards Committee (IHSC), announces the release of a new calibration standard, ICE-3, for the HPLC analysis of αand ß-acids. This standard replaces ICE-2, which is now withdrawn. BrewingScience -Monatsschrift für Brauwissenschaft, 63 (May/June 2010), pp. 92-93.
Laboratory Scale Test Minimizing Experimental Time and Effort for Pilot Scale FiltrationsInvestigating beer filtration using cellulose fibers requires appropriate methods. One aspect is the preparation of large scale trials. Starting from the filterability test according to Raible and based on the results of diverse pilot scale trials, a laboratory test was created. Apparatus, procedure and methods of assessing the results are described. The new test is qualified for reducing time and effort in upper scale trials, especially in case of varying filter aids compositions.
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