Analysis of physical impurities in regenerated solutions used in cleaning brewing systems

Abstract

This work reports the analysis of impurities found in recovered caustic and acid cleaning solutions that were regenerated post-cleaning by the process of sedimentation. Samples were taken weekly for 25 weeks from a brewery cleaning-in-place (CiP) system before CiP (clean solution, free of solid particles) and after cleaning in the brewhouse and mash filter. The volume and concentration of the solid sediment was measured in addition to particle size. Accordingly, the purification of recovered CiP solutions via sedimentation was less than effective, resulting in soiling which did not settle upon sedimentation and remained in the cleaning solution as a suspension. © 2018 The Institute of Brewing & Distilling.