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Utilization of biogas product from starch industry wastewater can be problematic due to relatively low productivity with methane content of less than 55 %. One of the reasons affecting methane production is nutrient deficiencies in microorganisms. This research studied the optimization of methane production from starch industry wastewater by addition of various ion metals. The potential for methane production was investigated by adding 7 ion metals including Fe, Ni, Zn, Co, Mo, Cu and Mn. The experiment included 3 groups, i.e. group 1, 2 and 3 that contained 3, 4 and all 7 types of ion metals, respectively, at different concentrations (low, medium and high) based on suggested literature. The process was conducted in batch fermentation, working volume of 400 mL, with temperature controlled at 35±2 ºC. The result shows that addition of 4 ion metals: Co, Mo, Cu and Mn at low concentration in starch industry wastewater is the most suitable condition for increasing methane in biogas. The methane production potential increased from 277±2 to 309±3 ml/gVSadded or increased 11.55% with faster production rate compared to the control by 12 days of HRT. It is therefore one alternative to enrich methane content in biogas from starch industry wastewater.
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