Effect of hydraulic retention time on hydrogen production and chemical oxygen demand removal from tapioca wastewater using anaerobic mixed cultures in anaerobic baffled reactor (ABR) |
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| Authors: | Phatlapha Thanwised Wanpen Wirojanagud Alissara Reungsang |
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| Affiliation: | 1. Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, A.Muang, Khon Kaen 40002, Thailand;2. Department of Biological and Environmental Science, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, A.Muang, Sakon Nakhon 47000, Thailand;3. Research Center for Environmental and Hazardous Substance Management, Faculty of Engineering, Khon Kaen University, A.Muang, Khon Kaen 40002, Thailand;4. Department of Biotechnology, Faculty of Technology, Khon Kaen University, A.Muang, Khon Kaen 40002, Thailand;5. Fermentation Research Center for Value Added of Agricultural Products, Faculty of Technology, Khon Kaen University, A.Muang, Khon Kaen 40002, Thailand |
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| Abstract: | This study evaluated hydrogen production and chemical oxygen demand removal (COD removal) from tapioca wastewater using anaerobic mixed cultures in anaerobic baffled reactor (ABR). The ABR was conducted based on the optimum condition obtained from the batch experiment, i.e. 2.25 g/L of FeSO4 and initial pH of 9.0. The effects of the varying hydraulic retention times (HRT: 24, 18, 12, 6 and 3 h) on hydrogen production and COD removal in a continuous ABR were operated at room temperature (32.3 ± 1.5 °C). Hydrogen production rate (HPR) increased with a reduction in HRT i.e. from 164.45 ± 4.14 mL H2/L.d (24 h HRT) to 883.19 ± 7.89 mL H2/L.d (6 h HRT) then decreased to 748.54 ± 13.84 mL H2/L.d (3 h HRT). COD removal increased with reduction in HRT i.e. from 14.02 ± 0.58% (24 h HRT) to 29.30 ± 0.84% (6 h HRT) then decreased to 21.97 ± 0.94% (3 h HRT). HRT of 6 h was the optimum condition for ABR operation as indicated. |
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| Keywords: | Hydrogen production rate (HPR) Tapioca wastewater Hydraulic retention time (HRT) Anaerobic baffled reactor (ABR) |
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