Establishment of reduction in alkali supply through distributed feeding in lab-scale UASB reactor treating acid wastewater

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In this study, an experiment was conducted to establish the operating method in which alkali supply is reduced in methane fermentation, using sweet potato-based and barley-based shochu distillery wastewater as acid wastewater. In order to raise pH 6.5 optimal for methane fermentation bacteria, alkalinity was required to indicate 0.08-0.12 kg CaCO_3/kg COD. It was found that methane fermentation in each wastewater generated approximately 0.1-0.2 kg CaCO_3/kg COD removal in alkalinity. There is some possibility that distributed feeding will be an effective method of reducing alkali supply for the treatment of acid wastewater.