Anaerobic Digestion • Biogas • Composting • Food Waste • Manure • Renewable Natural Gas
18th Annual Conference
BioCycle REFOR17

Renewable Energy From Organics Recycling

Oct. 15, 16, 17, 18, 2018
Raleigh, North Carolina
Raleigh Marriott Crabtree Valley
Official
Conference Of
The American
Biogas Council

Agenda: Monday ABC Workshop | Tuesday & Wednesday Session Preview | Thursday Site Tours | Event Schedule | Networking Events
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All-Day Site Tours
Thursday, October 18, 2018

Updated 7.17

All-Day Site Tours of organics recycling facilities.
Lunch included. Preregistration required.
Bus will stop at Raleigh-Durham International Airport before returning to Raleigh Marriott Crabtree Valley.

 

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Optima KV, Kenansville, NC

Optima KV, a collaborative venture between Smithfield Foods, two swine herd farmers and Cavanaugh Associates, is comprised of covered in-ground digesters at 5 contiguous farms housing a total of 60,000 pigs. Biogas produced at each farm is preconditioned and routed to a central gas clean-up facility through low-pressure piping. The gas clean-up system consists of pressure-swing absorption to remove carbon dioxide, hydrogen sulfide and other constituents. The cleaned biomethane (renewable natural gas) is pressured for injection into the Piedmont Natural Gas pipeline.


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McGill-Merry Oaks Composting Facility, New Hill, NC

The McGill-Merry Oaks composting facility, about 30 miles from Raleigh, opened in 2002. The operation is permitted by the NC Division of Waste Management as a Type 4 facility, the highest level of permitting in North Carolina. McGill-Merry Oaks is allowed to accept the widest range of organic waste materials, including yard trimmings, biosolids, food waste and a range of by‑products. To date, the facility has composted 1.5 million tons and produced and sold 1.1 million cubic yards of compost. In a typical year, it processes between 90,000 and 100,000 tons.
The McGill-Merry Oaks composting facility started out with indoor primary processing and outdoor windrow curing. Following a series of upgrades, design improvements and process advancements, the facility eliminated windrow curing several years ago. The growing demand for compost, especially for high value uses, drove the justification for the investment. Today all composting activities are indoors with woody amendments and ready-for-sale product stored outdoors. McGill-Merry Oaks uses the "McGill Process," a modified Rutgers strategy based on aerated static pile with temperature feedback. The site is comprised of 47acres but all activities are carried out within 8 acres.

 

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Butler Farms, Lillington, NC

Butler Farms, a hog finishing operation, installed a complete mix anaerobic digester with a geomembrane cover to manage swine manure. System includes hydrogen sulfide scrubbing and a 180kW generator set with a heat exchanger to provide the heat needed for the lagoon. Butler Farms has a Power Purchase Agreement With South River Electric Membership Cooperative (SREMC) and sells its renewable electricity back to them through the grid.  It also has a net metering agreement on its solar panels. Recently, SREMC and its power supplier, North Carolina Electric Membership Corporation (NCEMC), partnered with Butler Farms, to develop a local microgrid. Components include the farm's 20 kW solar panels, 185 kW biogas generator, and a 100kW diesel generator, and NCEMC-owned 250 kW/ 735 kW battery system and a controller to integrate and manage all components. The Butler Farms microgrid serves as a case study in how to integrate local renewable energy resources with energy storage to supplement traditional power sources and diversify the electric grid.