When the Idaho city of Caldwell replaced two old digesters with a new and larger one, Salvador Arreola had to make a decision about mixing technology.
All the mixers he knew about seemed to have problems with scum lines forming at the top, sand and grit settling at the bottom, and dead spots where the solids wouldn’t break down fast enough.Consulting engineer Larry Rupp of Keller and Associates in Boise suggested that a linear motion mixer might be a good fit. After some investigating, Arreola decided to go with it, and he hasn’t been sorry. “Every other kind of mixer I
