Itâ€™s no secret that the process of manufacturing cement is both energy intensive and dirty. Global cement production alone emits roughly five percent of greenhouse gas emissions annually, both as a byproduct of limestone decarbonation (60%) and from the burning of fossil fuels in the cement kilns (40%). And as the demand for concrete-intensive infrastructure soars in developing countries like China and India, global emissions from cement plantsâ€”and other industrial sourcesâ€”will continue to rise.
But a Canadian company called Pond Biofuels sees some real opportunity in all those industrial greenhouse gas emissions. At the St. Marys Cement plant in southwestern Ontario, Pond Biofuels has become the first to successfully use carbon dioxide emitted from a major industrial source to produce high value biomass from microalgae.
Pond Biofuels is capturing carbon dioxide and other emissions from a cement plant and using it to create a nutrient-rich algae slime which can be dried and used as a fuel.
The algae will be grown at a facility adjacent to the stacks, harvested, dried using industrial waste heat, from the cement plant and then used along with the fossil fuels that are currently used in its cement kilns. The company says they hope to demonstrate the scalability of the industrial pilot project and to show that it can be employed on virtually any industrial stack.
“To resolve the problem you have to have an industrial solution, not a laboratory solution,” Terry Graham, chairman of Toronto start-up Pond Biofuels told the Toronto Star. “In a laboratory you can control everything. But you canâ€™t do that in the field,” added Graham.