By Watt Committee
Power from the Biomass: 3rd EC convention (Proceedings of the overseas convention on Biomass Hel in Venice, Italy, 25-29 March 1985)
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Extra resources for Energy from the Biomass: Watt Committee: report number 5
Example text
ASCE, SA3, 111–127, May 1960 One of the important requirements of energy for the future is not only that it will be available, but that it will be cheap enough to use. Anaerobic digestion can produce methane gas, a clean premium fuel, at a cost not dissimilar to that of natural gas today. 16. D. S. Anaerobic digestion—the rate limiting process and the nature of inhibition . Science, 190, 4219, 1088–1089, Sept. 1975 17. P. Dynamics and control strategy for the anaerobic digester. D. Thesis, Dept.
32,33 A retention period of 10 days could be considered normal for high rate digesters, with good methane proportions of around 70%. Much of the available research work on this animal waste again shows some variation on likely gas generation. 2×104 TJ per annum as being theoretically possible. Clearly it would be economically impractical to digest all the waste, and most schemes of this kind include various kinds of screens and filters which recover the glass and metal content, and in so doing would allow only the putrescible fraction to enter the digester.
It is the role of the engineer to design and produce equipment best able to achieve these optimum conditions at minimum costs. In Europe, during World War II, many hundreds of digesters were installed, these were somewhat different in design from the Indian conception and were basically as shown in Figure 3. , were put into the series of pits. As most versions were unheated, retention times were long, especially in winter. Clearly this configuration was very labour intensive and loading and unloading must have been very unpleasant.
