The flavor depends heavily on the type of Saccharomyces doing the eating, and very few strains perform well in the hostile anaerobic conditions inside a brewing tank.

To treat high concentration of caprolactam sewage more effectively, up flow type of anaerobic sludge reactor was used to pre-treat before the former A/O system.

Anaerobic sequencing batch reactor (ASBR) is a new type and high rate anaerobic reactor, which has the advantages of being able to bearing high impact loads and having wide range of use.