Waste Handling for Swine Production Lori Marsh, Associate Professor, Biological Systems Engineering, Virginia Tech.

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Presentation transcript:

Waste Handling for Swine Production Lori Marsh, Associate Professor, Biological Systems Engineering, Virginia Tech

Swine production is most commonly accomplished indoors. Typically farms specialize in one of four production strategies: Breeding/Gestation; Farrowing; Nursery; and Grow out. Piglets in a nursery room. Swine in a grow out room. Farrowing: Sows with piglets, shortly after birth. Swine Production

The manure handling system for swine production typically depends on the climate where the facility is located. In warmer climates, pigs are most commonly raised on slatted floors with a shallow pit below. Manure falls into the pit and is flushed out to a lagoon. The lagoon serves as an anaerobic treatment unit. Typical lagoon for treating swine manure.

The liquid fraction of the lagoon is pumped out and land applied throughout the growing season. Typically, sludge is allowed to accumulate in the lagoon for several years before it is removed. Lagoon effluent being applied to a pasture.

In cold climates, lagoons do not function well. In this case, swine are typically raised on a slatted floor over a deep pit. Manure is stored in the pit until it is land applied. Application of manure pumped from a storage pit.

Some swine are produced on an open lot or on “deep pack.” This represents a small percentage of pork production.

Waste storage on deep pack is inside the building. Removal occurs at the end of the grow out period. The potential for composting this material is high.

BMP’s for Feed Management Applies to all production systems Phase feeding to match nutrient requirements for growth stage Use high-quality, highly digestible feeds Lysine and other amino acids in diet allow reduction in protein (and nitrogen) Minimize loss of feed/uneaten feed Phytase to reduce added P and excreted P

BMP’s for manure storage Adequate size Keep rain water out—cover if economically feasible Manage deep pits to minimize gas concentrations inside barn Stock pile manure on impervious surface Contingency plans for accidents/overflows

BMPs for Lagoon Systems Adequate size Proper start up Maintenance of embankment (vegetative cover, no trees, no rodents) including frequent inspections Fresh water diversion Pump and pipe maintenance/inspection Markers to show waste level relative to freeboard and treatment volume

BMPs for Land Application Nutrient management plan Agitate manure storage Record keeping Calibrate application equipment Buffers and setbacks Time application to meet crop needs Incorporate or inject

Manure Treatment Options Liquid-solid separation systems Composting Anaerobic lagoons Anaerobic digesters Constructed wetlands Emerging technologies, i.e. ”environmentally superior technologies”-- North Carolina Waste Management Center

Constituents of Concern Nutrients (many references) Pathogens (holding at 25 C for 90 d rendered manure pathogen free) –TatYee, G. and R.A. Holley. Pathogen survival in swine manure environments and transmission of human enteric illness-a review J. of Env. Quality. Vol. 32, NO. 2, pp Medicinal drug residues—No references found.