Abstract
Anaerobic digestion (AD) of distillery wastewater (DW) is not optimal because DW contains too high chemical oxygen demand (COD) concentrations. This research aimed to enhance biogas yield from DW with electrocoagulation (EC) pretreatment using iron electrodes. The novelty of this study is the combination of EC-AD for producing biogas from DW. The EC pretreatment was operated at various current densities of 39.31, 47.17, and 55.03 mA/cm2 for 8 h. Then, the supernatants were fed into the anaerobic digesters. The results showed that EC at 39.31, 47.17, and 55.03 mA/cm2 can decrease COD from 116,130 mg-O2/L to 93,976, 85,122, and 76,033 mg-O2/L. The AD with EC pretreatment at 39.31, 47.17, and 55.03 mA/cm2 resulted in biogas yields 6.8-fold, 11-fold, and 12-fold higher than the AD without pretreatment. The future research prospects are the techno-economic analysis and feasibility study of the combination of EC-AD for treating DW.
Published Version
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