Methods for carbon-capture within biochar

Abstract

Methods for carbon-capture within a biochar are provided. The method includes mixing a biochar with an alkaline solution to form an intermediate mixture and exposing the intermediate mixture to a CO2 source so as to precipitate calcium carbonate onto and into the biochar to form a CO2-weathered biochar. In some cases, the method also includes injecting CO2 into alkaline wastewater to sequester/store CO2 which can then serve as mixing water for producing cementitious composites. This method may be used to upcycle three waste streams, and treated CO2-weathered biochar preserves compressive strength of resultant concrete when substituted for a portion of the pre-cure cement and aggregate components. Further, treated CO2-weathered recycled aggregate preserves mechanical strength of resultant concrete when substituted for a portion of aggregate.

Dependencies are inferred from the claim text.