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Use of solar heat to upgrade biogas plant performance

Use of solar heat to upgrade biogas plant performance

Energy Conversion & Management 29(1): 73-75

The performance of a biogas plant is temperature dependent. At higher temperatures specific gas yield rises almost linearly with temperature and throughput time is reduced. In winter, gas yield drops due to a fall in temperature of the slurry. In winter, if slurry could be heated to 50°C, more efficient operation in the thermophilic range would be possible.The source for heating the slurry has to satisfy many constraints: year-round supply at low temperatures and should have no fuel costs. A salt gradient solar pond satisfies these criteria. The heat transfer system should avoid hot spots above 55°C but ensure effective performance. A temperature above 55°C will destroy methanogenic bacteria. A vapour condensation heat transfer system based on acetone (b.p. 55°C) consisting of a sealed system in which two containers, one each in a biogas digester and solar pond, connected by a sloping pipe is suggested.

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Accession: 001997337

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DOI: 10.1016/0196-8904(89)90015-0

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