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Feedstock for the digesters, in the form of organic slurry, arrives at the facility’s receiving area and is unloaded into one of 3 in ground receiving tanks, each of which can hold 400 cubic metres of volume. The receiving tanks’ large capacity allows us to continue receiving material on the front-end, even if there is an issue with the process further down the line. A concrete apron area captures spillage and drippage and diverts it to the receiving tank to ensure material is captured and prevent inadvertent release to the environment.
Piston pumps transfer the material to heat exchangers where it is heated to 70 degrees Celsius. Our process was were designed to transport thick material, eliminating the need to dilute feedstock. We strive to maintain total solids at 15-20%. Heated feedstock then moved to holding tanks for the required one hour, to destroy pathogens before being cooled.
Pasteurized feedstock is pumped into one of two digestion tanks, where the metabolic activity of micro-organisms produce biogas and digestate.
The feedstock stays in the digester at 35 to 40 degrees Celsius for approximate 30 to 40 days.
Agitators in the tanks break up floating islands in the digestate (the liquid by-product of anaerobic digestion). Submersible pumps moved digestate to skimmers where contaminants, including plastics, are removed. The pumps return the clean digestate to the tanks.
Biogas from the four tanks is collected and burned in the combined heat and energy (CHP) engine to produce thermal energy and electricity. We use the heat generated by the CHP to pasteurize the feedstock we receive at the facility and power other aspects of our operations. We feed the electricity into the Ontario power grid.
An on-site web lab and certified third-party labs monitor outbound digestate to ensure it complies with quality and regulatory requirements.
Digestate is pumped into trucks and hauled to lagoons or farms for direct land application.
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