Challenge In an effort to control the increasing cost of utilities, Anheuser- Busch installed anaerobic pretreatment at more than half of its twelve domestic breweries. In 1999, the Houston brewery commissioned its pretreatment system, which incorporated several novel technologies. One of these was the Rotoshear ® screen. A major consideration in the system design was the control of coarse solids, such as grain and label pulp, in brewery w

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