Abstract
Marine biomass such as seaweed and fishery waste is a potential energy source although it has not yet been practically utilized. This work focuses on renewable energy technologies, particularly anaerobic digestion, for the utilization of various organic wastes as energy resources. Primarily fundamental data for the efficient operation of an anaerobic digestion plant with marine biomass was obtained and a practical operation method was proposed using a simple model based on the carbon mass balance. Batch-processing experiments for seaweed, fishery waste and vegetable waste were carried out and each digestion characteristic was presented. The results indicate that fishery waste is the most efficient even though the accumulation of ammonium ions may inhibit methane production. Seaweeds are not efficient in either the production rate or the yield of methane gas. We investigated the efficient continuous operation for 6 biomass input scenarios with the proposed model. The results show that seaweed can be a useful supplement for the efficient operation.
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Acknowledgments
This study was supported by Grants-in-Aid for Scientific Research (Grand No. 22246110) under the Ministry of Education, Culture, Sports, Science and Technology in Japan and by Fundamental Research Developing Association for Shipbuilding and Offshore (REDAS). We are grateful to Prof. Masanori Hiraoka, Kochi University, Dr. Takayuki Kusakabe, Research Institute of Environment, Agriculture and Fisheries, Osaka Prefectual Government and Mr. Kotaro Goto, Nihon Mikuniya Co. Ltd., for providing cultivated seaweed (Ulva meridionalis), starfish and blue mussel, respectively. Our sincere thanks to Prof. Takasada Ishii, Osaka Prefecture University, for the HPLC analysis. Thanks are due to Mr. Nobuyuki Kotera for assistance with the experiments.
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Kuroda, K., Akiyama, Y., Keno, Y. et al. Anaerobic digestion of marine biomass for practical operation. J Mar Sci Technol 19, 280–291 (2014). https://doi.org/10.1007/s00773-013-0247-9
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DOI: https://doi.org/10.1007/s00773-013-0247-9