Dear Ali FarahmandGood ...
Published by Prem Baboo, Researcher at www.researchGate.net
Dear Ali Farahmand
Good question
The most important source of raw material in the yeast industry is a by-product of the sugar industry; molasses. Molasses, in the dry matter, contains 60% fermentable sugar and 40% non-sugar containing substances that cannot essentially be used by yeast.
Substances that cannot be used by the yeast remain in the wastewater and can cause serious pollution to the environment if they are passed into nature without any further treatment. Very high COD concentration values between 15,000 and 50,000 mg/l COD are indicative.
The ACS EGSB reactor, coupled with existing technologies such as flotation and sedimentation, can be used successfully for this application. With its patented technology, the ACS EGSB reactor reduces the COD load by 85-90%. The BOD5 concentrations can also further be reduced by approximately 90%.
http://article.sciencepublishinggroup.com/html/10.11648.j.ijema.20160405.13.html