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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK 4.0 CASE STUDIES OF ANAEROBIC DIGESTION PROJECTS To provide a reality base to the economic evaluations presented in the previous section, a number of operating and non-operating AD systems were surveyed using site visits and literature review. Some of the digester systems visited are outlined below as case studies to provide information on actual project and maintenance histories as well as the operator’s “lessons learned”. The case studies are presented in chronological order by their operational date. Figure 4.1 provides a numerical status report of farm-based anaerobic digesters in the United States. The data presented include the digesters that are installed on working dairy, poultry, and swine farms. It excludes 65-70 digesters that are installed on beef farms and digesters that are university research-oriented. These data also do not count 17 digesters that were shut down when the farms they were on were sold or quit livestock production. 35 30 25 20 15 10 5 0 FIGURE 4.1: U.S. Farm-Based Anaerobic Digester Status by System Type 7 7 8 6 1 18 10 Lagoon Slurry Plug Mix Operating Not Operating 0 The numerical status is not the whole story. Surveyed farmers who have installed and continue to operate digesters are generally satisfied with their investment decisions. Most chose to install digesters for non-economic reasons, primarily to control odor or contain excess nutrient runoff. Farmers have found that the returns provided from electricity and other coproduct sales from the digester, however limited, are preferable to the sunk-cost of conventional disposal providing zero return on investment. Moreover, without the environmental benefits provided by AD technology, 4-1PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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