ANAEROBIC TREATMENT OF YEAST MANUFACTURING WASTE-WATER IN UASB REACTORS

This paper describes the behaviour of the wastewater of a yeast manufa cturing plant, treated in UASB reactors. Test runs were made in a stra ight UASB, an UASB with recycle and a series combination of both. Maxi mum load attained is 10 KgCODm(-3)d(-1) for an HRT of 36 hours. It was found out that the wastewater contains about 35% of soluble non biode gradable COD, under the study conditions imposed. The recycle reactor processed slightly higher loads, developing smaller and more even size d granules.