H2/L-reactor using sewage sludge. However, thecow dung seed showed more ethanol production than hydrogen with peak concentration of12,146 mg COD/L. Increasing the sweet potato concentration could enhance the HPR and HP values.Maximum HY of 1.24 mol H2/mol hexose was obtained at a substrate concentration of 150 g/L with aninitial cultivation pH of 6.7 and particle diameter <1.19 mm using sewage sludge. The HPRmax, HY and HPvalues were affected slightly by the variations in sweet potato particle size. The peak total energyproduction yield of 1625 J/g sweet potato was obtained with sweet potato concentration of 150 g/L at pH8.5 using sewage sludge.
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