Dairy: 2006 operational, Hillcrest Saylors Dairy Farms LLC, Somerset County, 608 milking and dry cows, slurry loop (modified plug flow), concrete top, two 130kW CHP units with power purchase agreement. Engine generator water and exhaust jackets heat digester, hot water for milking parlor, domestic hot water, space heat to milking parlor and office. Separate biogas storage building with 8 hours of biogas storage, digested separated solids used for bedding and soil amendments.
Dairy: 2008 operational, Reinford Farm, Juniata County, 470 milking and dry cows, complete mix, digested separated solids used for bedding, non-expanding flexible cover, recovered heat utilization includes engine generator water and exhaust jackets to heat digester, hot water for milking parlor, heat to milking parlor, calf milk pasteurizer, house, domestic hot water and shop floor heat. Waste heat from the engine radiator is used for drying grain. A 130kW CHP unit with power purchase agreement.
Langerwerf Dairy
Digester Facelift: What We Found When We Took Apart a 16
Year-old Dairy Plug Flow Digester (7 pgs.):
A 1998 AgSTAR document discussing the disassembly and inspection of a 400 cow plug flow digester, revealing settled sand accumulation, floating scum layer, and no corrosion to internal piping and concrete. Refurbishment was accomplished and startup was completed in a total downtime of 6 weeks.
Tinedale Farms Anaerobic Digestion - Final Report July 2002 (31pgs.):
A technical report discussing the operation of a temperature phased anaerobic digester (TPAD) which is a digester designed with two tanks operating at two different temperatures; one thermophilic (133 OF) and one mesophilic (95 OF). It should be noted that this digester is now running as a single phase mesophilic digester.
Benefits, Costs and Operating
Experience at Seven New Agricultural Anaerobic Digesters (June 1998, 9 pgs.): An AgSTAR document reporting on three dairy plug flow digesters in NY, OR, and CT; three swine covered lagoons in NC, VA, and IA; and one complete mixed swine in IL describing the digesters, benefits, revenues and costs.
Long
Term Operation and Maintenance of a Digester at the Brendle Farms Poultry Operation (June
2004 Northeast Agricultural & Biological Engineering Conference (NABEC
Paper # 04-0042) (8 pgs.): This paper discusses the operation of one
of the few layer manure feedstock digesters in operation in the United
States. Grit removal in a pretreatment tank is discussed along with
digester capital costs, operation and maintenance and suggested future
improvements.
Wisconsin Agriculture Biogas Casebook 2008 Edition