THE POLLUTION PROFILE OF ALCOHOL DISTILLERIES TREATING BEET SUGAR MOLASSES

Fermentation of molasses and refining the produced alcohol by distilla tion is a common agroindustrial activity. The wastewaters originating from the process, especially the spent mash, are highly concentrated a nd contain TDS of over 50,000 mg/l as well as organic matter. Characte r of wastewaters varies with production application which affects the treatability characteristics. In this study four alcohol distillery pl ants treating beet sugar molasses are investigated to assess productio n applications and wastewater characteristics. Process profiles for th ree major modes of operation are prepared. Use of open steam and recyc le of spent mash was calculated to affect the wastewater volume up to 25%. COD load is found to be practically unchanged with recycle while TDS increased significantly. Nature of COD and treatability characteri stics are also expected to vary with recycle. Copyright (C) 1996 IAWQ. Published by Elsevier Science Ltd.