Compost Process

Jepson Prairie Organics - Compost ProcessJepson Prairie Organics (JPO) utilizes two primary types of feedstock in the composting process. Food scraps generated at restaurants, hotels, markets, and coffee shops throughout Northern California and yard trimmings generated in Dixon, Vacaville and Vallejo.

Presently, Jepson Prairie Organics processes approximately 11,000 tons per month of mixed organics. Materials that were previously disposed of in the landfill.

The two feedstocks are fed into an industrial sized grinder that utilizes fully electric state of the art preprocessing equipment, eliminating the consumption of diesel fuel and reducing the emissions associated with those fuels and mixed to attain a recipe of physical and chemical characteristics that are ideal for microbial decomposition.

The blended material is mechanically loaded into our adopted composting system, the ECS System, monitored for temperature and oxygen levels. These measurements ensure that proper temperatures have been reached and maintained in order to eradicate undesirable microbial life. After the composted material has undergone final screening to remove oversized material, the fines material is placed into windrows for curing.

The trommel screen separates the larger pieces from the finished product, and the result is a 3/8" finished compost. Our compost contains levels of nitrogen far superior to those of typical green waste compost due to the incorporation of our diverse feedstock featuring food scraps.

These windrows help age or "cure" the compost. During the curing period, the windrows are moisture conditioned and agitated with a windrow turner, which acts to reduce the particle size of the compost material and reintroduces oxygen into the pile.

How Does It Work?

Click on any of the following images to enlarge.
Food Scraps
Food scraps provide a diverse feedstock to make rich compost filled with nutrients that benefit the soil.
Fresh Compost Pile
A pile of rich compost is screened and made ready for shipping to customers.
Composted Vine rows
A pile of rich compost ready to be applied between rows of vines at Madrone Vineyard, Sonoma County.
Compost Spreader
A spreader applies our rich, black compost between rows of vines at Domenici Ranch, Sonoma County.
Compost Demonstration
A quarter shows the scale of a fresh layer of compost applied between rows of vines at Madrone Vineyard.
Grapes
More than 100 vineyards in Northern California use Four Course Compost to improve soil structure and return nutrients to the root zone.


Why Compost?

Since we began processing food scraps and yard trimmings we have processed more than 985,129 tons of material that otherwise would have gone to the landfill. The finished compost is used as an alternative to petroleum based fertilizers, increases soil water retention and improves soil organic content.

  • Jepson Prairie Organics (JPO) processes approximately 11,000 tons per month of mixed organics. Materials that were previously disposed of in the landfill.
  • JPO has composted approximately 985,129 tons of mixed organics, helping to reduce greenhouse gases.
  • Utilizes fully electric state of the art preprocessing equipment, eliminating the consumption of diesel fuel and reducing the emissions associated with those fuels.
  • Employs reversed aerated static pile technology (Engineered Compost Systems). System designed to remove approximately 85-90% of previous emissions generated by the older systems.
  • Collects all runoff from composting facility, eliminating discharges to waters of the state of California. The collected water is reused to moisture condition feedstocks prior to the composting process, thus reducing the need for well water.
  • Utilizes fully electric screening plant, eliminating the consumption of diesel fuel and the emissions associated with those fuels.
  • JPO produces approximately 90,000 cubic yards finished compost annually.
  • Finished compost materials are sold into the agriculture, landscape and erosion control industries. Compost utilized in the agriculture industry reduces the dependency on petrochemical fertilizers and reduces water consumption by providing a healthier soil.
  • Finished composts applied to agricultural fields help to sequester C02, helping in the reduction of greenhouse gases.
  • JPO processes approximately 150 tons of food waste material per week, for anaerobic digestion. The anaerobically digested food produces clean renewable energy for the powering of homes and industry throughout Central California.