Enhancement of household biogas production by solar collector and solar greenhouse
Abstract
The objective of this study is to enhance the biogas production by increasing the temperature of the digested slurry inside the biogas digester to be within the appropriate range (37±2°C). Two solar heating techniques including solar collector and solar greenhouse were applied and compared in this study. Operational parameters of biogas production were kept under the same condition such as the feeding material with Organic Loading Rate (OLR) 5.6 kg COD/m3organic waste; Hydrolic Retention Time (HRT) is 10 days; digested slurry was mixed for 10 min every 3 h; and the experimental data were recorded every hour during 12:00 am till 12:00 pm. The experimental results showed that use of solar collector technique was able to increase and maintain temperature of digested slurry inside the biogas digester and was within the proper range, continuously. While solar greenhouse was able to increase temperature of digester slurry as well as solar collector technique but temperatures were mostly higher than the proper range of anaerobic operational temperature. Furthermore, total biogas production quantity when using solar collector and solar greenhouse were 368.60 L/kg CODremoved and 234.99L/ kg CODremoved respectively, while total biogas production quantity without using solar heating was 100.31 kg CODremoved. In addition, the ratios of biogas production when using solar collector and solar greenhouse, as compared to biogas production without solar heating, were 3.9 and 2.4, respectively. As a result, solar collector technique is the most effective method to enhance the biogas production from anaerobic fermentation process.
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