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Table 2. Costs for anaerobic digestion manure handling system for Farm A. First Year Expense Ten Year Expense Operation and Maintenance Nutrient Value Remaining Solids Sold Electricity Sold Net Income Net Income per Cow Present Value ($365,000) ($22,696) ($151,786) $334,406 $318,550 $235,636 $349,109 $698 Yearly Amount ($15,460) $34,060 $32,445 $24,000 $35 Without including the nutrient value the system has a present value of $1 per cow over the 20 year life of the system. Some farms may not be able to obtain a benefit from the manure. Farms with fields that have high to excessive levels of phosphorus and potassium may even see these nutrients as a detriment. Appropriate nutrient management will be needed to utilize the nutrients to maximize crop uptake. The ability to irrigate the effluent on growing crops without excessive odors will increase the likelihood that the nutrients can be used. Farm B This dairy farm is presently a 170 cow operation located in a rural area of the south west part of NY State. The farm is owned and managed by one family. They rebuilt and expanded their farm in 1993 when a fire destroyed their tie stall barn. Their present facility can hold up to 300 cows. They may expand beyond that some time in the future. They chose a manure handling system that will both allow them to minimize labor and allow them to control odors produced by the manure. They hope that sales of the solids produced can help their cash flow. Figure 2 shows the layout of Farm B's buildings and manure handling system. This farm site is on a fairly steep hillside. This facilitates the gravity flow of the manure system but added to the construction costs for extra earthmoving. The producer chose a new wetland treatment system for manure handling that seemed to work well with his idea of minimizing labor by using a flush system to remove the manure from the freestall barn. The Bion system is a patented process that uses managed shallow ponds to separate the manure solids into aquatically stabilized solids. These solids are then harvested, dried, screened and sold as a soil amendment. The system recycles the biologically active liquid to move the manure through the ponds. The water from the facultative lagoon is used to supply the flush water for the system. Odors are much reduced when this system is operating correctly. The effluent from the facultative lagoon is relatively low in nutrients. Ammonium nitrogen is lost into the air from this system. Some nutrients are moved off the farm as solids. There may be significant settling of phosphorus in the bottom of the facultative lagoon. 7PDF Image | ANAEROBIC DIGESTION AND WETLAND TREATMENT CASE STUDY: COMPARING TWO MANURE ODOR CONTROL SYSTEMS FOR DAIRY FARMS
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