Regulating the hydrolysis of organic wastes by micro-aeration and effluent recirculation |
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| Authors: | Min Zhu Fan Lü Li-Ping Hao Pin-Jing He Li-Ming Shao |
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| Affiliation: | 1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;2. Shanghai Municipal Sewerage Co., Ltd., Shanghai 200233, China;1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing 100012, China;3. School of Marine Science and Technology and Environment, Dalian Ocean University, Dalian, Liaoning 116032, China;4. Jilin Petrochemical Wastewater Treatment Plant, PetroChina Jilin Petrochemical Company, Jilin 132000, China;1. Department of Molecular Biosciences and Bioengineering (MBBE), University of Hawai''i at Mānoa, 1955 East-West Road, Agricultural Science Building 218, Honolulu, HI 96822, USA;2. College of Agriculture, Forestry and Natural Resource Management (CAFNRM), University of Hawai''i at Hilo, 200 W. Kawili Street, Hilo, HI 96720, USA;1. Chemical Engineering Department, Universidad de Santiago de Chile, Ave. Lib. Bdo. O''Higgins, 3363, Santiago de Chile, Chile;2. Chemical and Environmental Engineering Department, Universidad Técnica Federico Santa María, Valparaíso, Chile;1. Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;2. Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China;3. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China;1. Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, Singapore 637141, Singapore;2. Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore |
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| Abstract: | In this study, the effects of micro-aeration and liquid recirculation on the hydrolysis of vegetable and flower wastes during two-phase solid–liquid anaerobic digestion were assessed. To accomplish this, we evaluated the hydrolysis of five batches of waste that were treated under the following conditions: anaerobic, insufficient micro-aeration (aeration for 5 min every 24 h), and sufficient micro-aeration (aeration for 5 min every 12, 4 and 1 h). Hydrolysis was found to depend on the level of micro-aeration. Specifically, insufficient micro-aeration led to unstable and decreased performance. Conversely, sufficient micro-aeration promoted the hydrolysis of easily biodegradable carbohydrates and proteins, but the microbial activity was later impaired by liquid recirculation using methanogenic effluent. The hydrolysis efficiency under anaerobic conditions was comparable to the efficiency observed under sufficient micro-aeration, while the cumulative TOC of the anaerobic batch was 1.4–2.4 times higher than that of the micro-aerated batches. In addition, liquid recirculation did not have a negative effect on the development of microbial activity under anaerobic conditions, which resulted in the lignocelluloses having a higher hydrolysis efficiency. |
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