Innovation Spring 2025

Felicia Crozier works as a process leader on the anaerobic digestion systems that convert organic waste into RNG at the Surrey facility. P hoto : C hris C hong /B utter S tudios

to ensure that we have the right nutrient content and density going into our process.” One of the challenges working with biological components is managing fluctuating biomass volumes – peak seasons for Convertus typically are the spring and fall, when first grasses and final leaves inundate the facility. “We’re always in a state of planning for this peak season or recovering from it,” Crozier said. Additionally, system breakdowns can be extremely detrimental to the RNG production process and difficult to diagnose and resolve due to system complexity. “If any nitrogen gets in the system, it’s almost impossible to get it out without having to flare off the bad gas,” Crozier continued. “It’s a lot of detailed troubleshooting on a lot of interconnected systems.” That said, these challenges present opportunities to refine and improve on processes down other avenues. As an example, a third generation of secondary biofuels that has not yet reached full commercial potential uses algae to produce bioethanol. The benefit of using algae as a biofuel source is it can grow in a tank, which improves the area-to-mass ratio while saving land for more productive uses. The increased demand and process advances in biofuel continue to drive the industry. While RNG has been the focus of BC governments and utilities, different markets may emerge to produce different biofuels.

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Innovation Spring 2025

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