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Eventually the fine solids must be removed from the bottom of the primary holding pond. Odors generally accompany the removal of solids. Secondary Holding Ponds It is common to have a number of holding ponds that provide the required detention time (180 days) following the primary holding pond. The irrigation and flush pumps are normally installed in one or more of these ponds. Typical Secondary Holding Pond Summary As indicated above, two separate waste streams, the milk parlor and confinement area wastes, makeup the dairy waste that can be treated through anaerobic digestion. The type of bedding used, as well as the manure transport, and subsequent manure processing will change the characteristics of both waste streams. The dilution of waste will require larger anaerobic digestion facilities. The removal of organics through screening and sedimentation will reduce the quantity of organic solids that can be converted to gas in the digester. The presence of sand and silts will clog pipes, damage equipment, and fill anaerobic digestion tanks. Sand can only be removed from dilute waste streams. Thick slurries retain sand that precipitate in the digester when the organics are converted to gas and the solids concentration is reduced. If thick slurries are processed in an anaerobic digester, intense mixing is required to maintain the © Environmental Energy Company 14 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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