Simultaneous biohydrogen production with distillery wastewater treatment using modified microbial electrolysis cell |
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| Affiliation: | 1. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India;2. Conn Center for Renewable Energy Research, University of Louisville, Kentucky, USA;1. Department of Biology, Faculty of Science, Thaksin University, Phatthalung, 93210, Thailand;2. Chemistry Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Muang, Pattani, 94000, Thailand;3. Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen, 40002, Thailand;4. Research Center in Energy and Environment, Faculty of Science, Thaksin University, Phatthalung, 93210, Thailand;1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Petroleum Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar, 32610 Perak, Malaysia;4. Department of Chemical Engineering, University of Qom, Qom, Iran;5. Korean Institute of Science and Technology, Seoul 136-791, Republic of Korea;6. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;7. IMDEA Water Institute, Technological Park of the University of Alcalá, Alcalá de Henares, Spain;1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, PR China;2. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, 310012, PR China;3. Center for Microbial Ecology and Technology, Ghent University, Coupure Links 653, Ghent, B-9000, Belgium |
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| Abstract: | The objective of the present study was to construct a compact retrofit design of Microbial Electrolysis Cell (MEC) within an anaerobic digester. In this design, the cathode chamber is inserted in the anodic chamber for compactness, improved hydrogen production and wastewater treatment efficiency. The performance of the new design is compared with that of a conventional (dual chamber) MEC. A cumulative hydrogen of 40.05 ± 0.5 mL and 30.12 ± 0.5 mL were produced at the current density of 811.7 ± 20 and 908.3 ± 25 mA/m2 respectively for conventional and modified MEC system. The cathodic hydrogen recovery (CHR) defined as the recovery of electrons as hydrogen which was observed a maximum of 46.5 ± 0.8 and 38.8 ± 0.5% in conventional and modified MEC. The Coulombic efficiency (CE) defined as the recovery of total electrons in acetate as current was observed as 17.25 ± 0.15 and 16.82 ± 0.1% for conventional and modified MEC. In addition, the wastewater COD removal efficiency was observed to be 77.5 ± 1.0% and 75.6 ± 1.5 in 70 h for conventional and modified MEC designs. As shown in the work below, the modified compact design worked effectively to produce hydrogen under different COD concentrations; anolyte and catholyte concentrations; and applied potentials. Thus the modified compact MEC which is also a retrofit to an existing anaerobic digester can extend the use of anaerobic digesters and improve their economics in waste water treatment. |
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| Keywords: | Microbial electrolysis cell Hydrogen Reactor design Current density Distillery wastewater |
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