Abstract
Anaerobic digestion of organics present in beer brewery wastewater was investigated based on hydrogen generation. The advantage of the fermentative method of biohydrogen generation is that it treats the waste and also yields energy value in terms of hydrogen, which is not a greenhouse gas, as a gaseous by-product. The hydrogen-generating microflora was isolated from cow dung through pH adjustment (pH 5) coupled with two consecutive heat treatments (1 hr each). For influent chemical oxygen demand (COD), a concentration of 2,470 mg/L at a hydraulic retention time (HRT) of 1 day resulted in the following values: outlet COD, 760 mg/L; biogas volume, 6.7 L; and hydrogen content, 60%. A 7-day HRT for the influent COD resulted in the following values: outlet COD, 112 mg/L; biogas volume, 9.7 L; and hydrogen content, 62%. The volatile fatty acid content, redox potential, and pH in the reactor were 440 ± 120 mg/L, −360 ± 30 mV, and 5.5 ± 0.2, respectively. The average biogas generation destroyed 0.47 m3 of COD per kg during anaerobic digestion of beer brewery wastewater based on biohydrogen generation. The study proved the feasibility of the fermentative method of biohydrogen generation from beer brewery wastewater.
Published Version
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