Converting Biosolids in Carbon

Nov 1, 2023

McMinnville-based Solid Carbon says it’s come up with a way to trap the carbon emitted during sewage treatment, locking it away in fresh concrete.

Treated wastewater sludge is not something many people often think about, let alone as a climate opportunity. But the treatment process is a major source of carbon emissions, and McMinnville-based Solid Carbon is touting a new way to store that stuff in concrete, sequestering tons of CO2 that would otherwise be released by the decomposing waste.

“Think of everything that goes down the sewer pipe,” said Solid Carbon co-founder John Mead. “The water is treated, discharged, the solids are pulled out. (Our process) thermally treats that, and turns it into our bio-lock patent-pending ad-mixture.”

Mead and co-founder Michael Bernert have perfected a mixture using the remnant sewer sludge, which can be charred, repurposed, and have its carbon emissions sealed away.

“Our third-party validation of our E-P-Ds (Environmental Product Declarations) shows one pound of CO2 removed for every pound of our product that’s put into a concrete mixture,” Mead said.

 

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