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The anaerobic digester on Keith Broumley's farm consists of a sloped, lined and covered lagoon.
Incoming waste passes through a solids separator before entering the digester. Biogas captured from the digester is sent to an electricity generator.
Through a cooperative agreement with the local electricity provider, the electricity generated on-site will be fed into the local grid and the equivalent amount will be credited to the dairy producer's account, effectively providing retail price for the electricity.
After digestion, the wastewater stream will then be fed to the biological phosphorus removal process where water will circulate between anoxic, anaerobic and aerobic zones to achieve bioaccumulation of phosphorus.
The processed liquid will then be reused within the dairy operation or land applied in accordance with Broumley's comprehensive nutrient management plan.
Solids from the separator, anaerobic lagoon and phosphorus removal pond will be moved to a compost management area or hauled off-site to a local compost facility. The process will ultimately target an 80 percent reduction of phosphorus in the waste stream.
