Although lumen flushing is
effective, hydrogen peroxide proved to be the most
effective cleaning agent. The negative flux recovery
after nitric acid cleaning could be explained by the
ligand exchange theory. The performance of digester is
greatly improved with membrane pretreatment,
especially in the case of naked barley based stillage.
Pretreatment may include the addition of chemicals to
prevent organic materials or soluble salts from fouling
the membrane.