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Figure 2. Farm B layout of manure handling system. Wetland System Description Manure from the four freestall alleys is flushed 3 times a day into the wetland system. Each flush consists of 10 thousand gallons of recycled water from the facultative lagoon. There is no noticeable odor in the barn as the flush system is operated. The Waterman flush valves are opened for 4 to 6 minutes per alley. The alleys are sloped at a one percent grade toward 6 inch wide grate covered drop inlets that lead to a 30 inch smooth plastic pipe that outlets next to the first shallow settling pond. This flow from the barn flush as well as flows from the milking center and silage juice from the bunk are controlled and routed to the two shallow settling ponds. The milking center water can only go to the smaller pond because the elevation of the larger pond is too high. The pipes, valves, and holding tank to deliver the flush water to the barns and return it to the wetland system cost $32,089. This includes the four flush valves that each cost $550. The settling ponds are designed to slowly build up solids forcing new flows through the existing solids on the way to the outlet. The excavation for the ponds cost $60,000 plus $950 for the survey. The outlet structures allow up to two feet of solid build up while letting the liquids drain out. When the larger pond is full, the flows are directed to the smaller pond until the solids are drained and harvested. The smaller pond is then cleaned by adding water, agitating and pumping to the larger pond. The removal of the manure solids is done every year from the larger pond. A back hoe with a 32 foot reach is used for 48 hours to place the material on the banks. The track mounted backhoe 8PDF Image | ANAEROBIC DIGESTION AND WETLAND TREATMENT CASE STUDY: COMPARING TWO MANURE ODOR CONTROL SYSTEMS FOR DAIRY FARMS
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