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Introduction Dairy Waste Anaerobic Digestion Handbook Dennis A. Burke P.E. The rapid growth in the size of dairy operations has resulted in new laws and regulations governing the handling and disposal of manure (Mitchell and Beddoes 2000). Requirements for nutrient management plans, manure solids disposal, and odor control (HouseBill 2001) make it necessary that new manure management approaches be considered. One of the more promising methods is anaerobic digestion. Anaerobic digestion is a natural process that converts biomass to energy. Biomass is any organic material that comes from plants, animals or their wastes. Anaerobic digestion has been used for over 100 years to stabilize municipal sewage and a wide variety of industrial wastes. Most municipal wastewater treatment plants use anaerobic digestion to convert waste solids to gas. The anaerobic process removes a vast majority of the odorous compounds (Lusk 1995),(Wilkie 2000),(Wilkie 2000). It also significantly reduces the pathogens present in the slurry (Lusk 1995). Over the past 25 years, anaerobic digestion processes have been developed and applied to a wide array of industrial and agricultural wastes (Speece 1996), (Ghosh 1997). It is the preferred waste treatment process since it produces, rather than consumes, energy and can be carried out in relatively small, enclosed tanks. The products of anaerobic digestion have value and can be sold to offset treatment costs (Roos 1991). Anaerobic digestion provides a variety of benefits. The environmental benefits include: • Odors are significantly reduced or eliminated. • Flies are substantially reduced. • A relatively clean liquid for flushing and irrigation can be produced. • Pathogens are substantially reduced in the liquid and solid products. © Environmental Energy Company 1 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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