Two-stage anaerobic dry digestion of blue mussel and reed |
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| Affiliation: | 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;1. Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan;2. Department of Microbiology, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan;1. Hellenic Agricultural Organisation Demeter, Institute of Animal Science, 58100 Paralimni, Greece;2. Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark;3. Department of Biology, University of Padova, Via U. Bassi 58/b, 35121 Padova, Italy;4. School of Chemical Engineering, National Technical University of Athens, Zografou Campus, Athens 15780, Greece;1. Department of Hydraulics and Sanitation, University of São Paulo, Av. Trabalhador Sãocarlense, 400, Centro, CEP 13566-590, São Carlos, SP, Brazil;2. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, CEP 13565-905, São Carlos, SP, Brazil;1. Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China;2. Department of Water Supply and Environmental Engineering, Arba Minch University, P.O. Box 21, Arba Minch, Ethiopia;1. Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China;2. Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China;3. Southwest Collaborative Innovation Center of Swine for Quality & Safety, Chengdu 611130, PR China;4. Bioprocess Control AB, Scheelevägen 22, 223 63 Lund, Sweden |
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| Abstract: | Blue mussels and reeds were explored as a new biomass type in the Kalmar County of Sweden to improve renewable transport fuel production in the form of biogas. Anaerobic digestion of blue mussels and reeds was performed at a laboratory-scale to evaluate biogas production in a two-stage dry digestion system. The two-stage system consisted of a leach bed reactor and an upflow anaerobic sludge blanket (UASB) reactor. The two-stage system was efficient for the digestion of blue mussels, including shells, and a methane yield of 0.33 m3/kg volatile solids (VS) was obtained. The meat fraction of blue mussels was easily solubilised in the leach bed reactor and the soluble organic materials were rapidly converted in the UASB reactor from which 68% of the methane was produced. However, the digestion of mussels including shells gave low production capacity, which may result in a less economically viable biogas process. A low methane potential, 0.22 m3/kg VS, was obtained in the anaerobic two-stage digestion of reeds after 107 days; however, it was comparable to similar types of biomass, such as straw. About 80% of the methane was produced in the leach bed reactor. Hence, only a leach bed reactor (dry digestion) may be needed to digest reed. The two-stage anaerobic digestion of blue mussels and reeds resulted in an energy potential of 16.6 and 10.7 GWh/year, respectively, from the estimated harvest amounts. Two-stage anaerobic digestion of new organic materials such as blue mussels and reeds can be a promising biomass resource as land-based biomass start to be limited and conflict with food resources can be avoided. |
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