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http://dx.doi.org/10.17137/korrae.2020.28.1.15

Biogas potential estimation for mono- and co-digestion of cow manure and waste grass  

Ahn, Johng-Hwa (Department of Environmental Engineering, Gangwon National University)
Gillespie, Andrew (Civil Engineering Division, School of Engineering, University of Glasgow)
Shin, Seung Gu (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.28, no.1, 2020 , pp. 15-25 More about this Journal
Abstract
Biogas production potential was experimentally estimated for mono- and co-digestion of cow manure and waste grass. The two organic wastes were mixed at five different ratios (100:0, 75:25, 50:50, 25:75, 0:100) on the volatile solids basis, and were assessed using biochemical methane potential (BMP) test. Thee reaction temperatures, 25℃, 30℃ and 35℃, were applied as well, resulting in 15 different combinations for the test. The results showed that both higher temperature and waste grass mixing ratio resulted in higher methane yield and maximum methane production rate. Based on the experimental results, a theoretical farm- or community-scale (240 or 2400 ㎥) anaerobic digester was designed to evaluate the energy balance associated with mono- and co-digestion of the wastes at different temperatures. Although the energy production increased as the temperature and the waste grass mixing ratio increased, the net energy gain, energy production subtracted by energy consumption for heating and maintenance, was estimated to be the highest at 30℃, followed by at 35℃ and 25℃. Therefore, it is advised that both the experimental methane production and the detailed design parameters must be considered for the optimization of the net energy gain from these wastes.
Keywords
animal manure; anaerobic digestion; reaction temperature; methane yield; energy balance;
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Times Cited By KSCI : 4  (Citation Analysis)
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