Mohammad Razif, Sarwoko Mangkoedihardjo : Appropriate Fermentation Process for Tapioca's Wastewater in Indonesia
Prof. Dr. Ir. Sarwoko Mangkoedihardjo MScES
Tapioca's wastewater containing BOD of about 3000 mg was treated by means of yeast fermentation in anarobic batch scale reactors. Various dosages of the yeast ranging from 10 to 30% of effective reactor volume and wastewater concentrations in the range of 50 to 100% were investigated for different fermentation periods ranging from 3 days to 21 days. Without nutrients amendment to the diluted wastewater of 50% concentration. the yeast suspension dosage of 10% was resulted in the maximum absolute BOD removal of 40% during 14 days period. At the same conditions, increasing the yeast dosage of 30% was shown to increase the maximum absolute BOD removal up to 70% for non-diluted wastewater.