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In recent years biogas production from animal manure through anaerobic digestion has received increased attention. The potential for methane fuel production from the confined livestock operations is well recognized. However, farmers in North America have been hesitant to adopt bio gas technology. This is due in a large part to the high capital investment required for the construction of large-volume, conventional (suspended-biomass) anaerobic digesters (Jones et al. 1977 Feddes et al. 1980). Considerable technical improvements and cost reduction measures in anaerobic digestion are being pursued in many lab oratories. The two basic approaches are: (1) to increase the rate of reaction, allowing more output per unit volume of digester, and (2) to decrease the cost of digesters by designing simple, unmixed digesters (Robinson 1980). In the first approach, advanced reactor (AR) designs such as the fixed-film concept (van den Berg and Lentz 1980), the fluidized-bed reactor (Inaba et al. 1981), and the attached-film, expanded-bed reactor (Switzenbaum and Jewell 1980) have been studied to improve the rate of biogas production from substrates with low solids concentration. The key to successful operation is to maintain a high concentration of microorganisms within the reactor. The second approach employs the plug-flow concept (Jewell 1978) which tends to lead to a lower biogas production rate in comparison with the conventional digesters.
a comparison of biogas production from dairy manure filtrate using conventional and fixed-film reactors
Lo, K. V., Liao, P. H., Bulley, N. R. and S. T. Chieng 1984. A COMPARISON OF BIOGAS PRODUCTION FROM DAIRY MANURE FILTRATE USING CONVENTIONAL AND FIXED-FILM REACTORS. Canadian Agricultural Engineering 26(1):73-78.
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