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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Among the types of farm-based digesters actually built, the failure rate for complete-mix and plug- flow technologies are staggering; 71% and 63%, respectively. For covered lagoon digesters, the failure rate is around 12%. Because there are fewer operating slurry digesters, their current 100% success rate is certainly inconclusive. Once slurry digesters have a larger market share, the opportunity for system failures caused by poor design, fabrication, and operation will be more equal to that of the other technologies, and the slurry’s performance can then be gauged. One encouraging note is that reliability of the digesters constructed since 1984 is far better than that of those constructed during the period 1972-1984. This is generally due to a more simplified digester design. Even more encouraging is the resurgence of interest in farm-based AD technology. For example, in the past 4 years (1994-1998) 11 new systems were installed. Another 10 systems are currently under construction or in a design phase. 6 4 2 0 -2 -4 -6 -8 -10 FIGURE 4.3: U.S. Farm-Based Anaerobic Digester Status by Installation Date 4 333 3 5 2 11111 (1) (1) (1) (2) (5) (9) (3) (7) Operating Not Operating A project now under construction near Bellingham, Washington,1 is using technology licensed from Germany. The modular digester will be fed the manure from 1,500 dairy cows, and is designed to be slightly oversized to retire the anaerobic lagoon now used. The saleable commodities are scheduled to be a liquid organic nutrient and electricity. One interesting point about this operation is 1 Thomas, M. (6 August 1998). Personal communication. Safe Environmental Inventions, Inc., Bellingham, WA. 4-3 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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