Innovative Projects

"Yolo County Central Landfill is one of the most innovative, 
environmentally conscious landfills in the country!"


   •  Full-Scale Bioreactor Landfill
   •  Rubberized Asphalt Concrete

More active links to follow as project milestones are reached:

    •  Aerobic Bioreactor Landfill
    •  Anaerobic Digestion compost Pilot Project
    •  Intelligent Bioreactor Management Information System (IBM-IS)

   •  Groundwater Phytoremediation

The area surrounding the landfill has a high groundwater table. In order to keep the groundwater table low, groundwater is pumped from sixteen wells along the northern landfill boundary.  Shallow groundwater in this area of the valley contains boron and selenium. These minerals are naturally-occurring but the amount in the water is too high for the water to be released into the adjacent Willow Slough bypass.
Kenaf in bloom

Phytoremediation (using plant activity for treatment) is used to reduce the boron and selenium concentrations present in the groundwater. The Phytoremediation process consists of a piping system, a 35 acre storage reservoir, and a land application area. During the wet season, excess groundwater is piped to the reservoir for storage. Then during the dry season, the water is piped to the land application area, two 45–acre parcels of land, where it is used for irrigation to grow kenaf. Kenaf, a hibiscus relative, is a plant known to accumulate boron and selenium. Kenaf is planted annually in one parcel while the other parcel remains fallow. Harvested in the fall, the kenaf is used as alternative daily cover in place of soil.

 

Engine powered by landfill gas

•  Landfill Gas to Energy

A landfill gas-to-energy plant is located just south of Waste Management Units 4 and 5 and west of the water storage pond. The facility is owned and operated by Minnesota Methane. Minnesota Methane leases rights to the landfill gas from the County under a gas production agreement, and also operates the energy plant. The company pays royalties to the County on sales to outside customers of the electricity and landfill gas .

The LFG collection system routes the landfill gas to the plant where it is then burned in up to five internal combustion engines or a flare. The plant

is currently permitted for two, Caterpillar G399, and two Caterpillar G3516 Internal Combustion engines with one additional G3516 planned for future installation. The five engines have a combined permitted capacity to burn up to 2,107 cubic feet per minute of landfill gas and produce a maximum of 3,860 kilo Watts per hour. The flare is permitted to burn a maximum of 2,022 cubic feet per minute, which is more than the landfill is currently producing.