Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment |
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| Institution: | 1. Instituto de Tecnología Cerámica, Asociación de Investigación de las Industrias Cerámicas, Castellón, Spain;2. Instituto Universitario de Tecnología Cerámica, Universitat Jaume I, Castellón, Spain;3. Departamento de Ingeniería Química, Universitat Jaume I, Castellón, Spain;1. LHD, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. Dept. of Mechanical and Aerospace Engineering, Miami Wind™ University of Miami, Coral Gables, FL 33124, United States;1. Chitkara University, Punjab, India;2. Guru Nanak Dev University, Amritsar, India;1. Department of Environmental Engineering, Kumoh National Institute of Technology, Daehak-ro 61, Gumi, Gyeongbuk, 730-701, Republic of Korea;2. Marine Energy Convergence & Integration Laboratory, Jeju Global Research Center, Korea Institute of Energy Research, Republic of Korea;3. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, 739-8527, Japan;4. School of Applied Biosciences, Kyungpook National University, Daegu, 702-701, Republic of Korea |
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| Abstract: | Recently, bioenergy recovery from sludge biomass has attracted increasing attention due to the high demand for renewable energy resources. In order to enhance methane production from sludge biomass, electrochemical treatment can be used as a novel and efficient pretreatment for the hydrolysis of sludge biomass. In this study, a combined electro-flotation and electro-oxidation pretreatment was employed to improve the anaerobic degradability of sludge biomass. Electro-flotation was efficient in separating flocs in the mixed liquor and led to a sludge volume reduction greater than 60% after 10 min of operation at a current density of 4.72 mA cm−2. Electro-oxidation using IrO2/Ti anode was performed to improve the anaerobic degradability of sludge and resulted in a 30% increase in COD solubilization after 30 min of operation at current density of 9.45 mA cm−2. The factors affecting electro-oxidation, i.e. the gap width between anode and cathode, current density and applied voltage, were investigated to optimize the operating conditions. A biochemical methane potential assay demonstrated that the anaerobic biodegradability of sludge was enhanced by combined electro-flotation and electro-oxidation pretreatment. |
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| Keywords: | Electro-flotation Electro-oxidation Biogas Biodegradation Cell disruption Process integration |
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