Masindi et al. (2023): Wastewater Treatment for Carbon Dioxide Removal

Vhahangwele Masindi, Spyros Foteinis, Phil Renforth, Efthalia Chatzisymeon IN: ACS Omega, https://doi.org/10.1021/acsomega.3c04231

The wastewater treatment process itself could present an innovative carbon dioxide removal (CDR) approach. Here, the calcium (Ca)-rich effluent of a phosphorus (P) recovery system from municipal wastewater (P recovered as calcium phosphate) was used for CDR. The effluent was bubbled with concentrated CO2, leading to its mineralization, i.e., CO2 stored as stable carbonate minerals. The chemical and microstructural properties of the newly formed minerals were ascertained by using state-of-the-art analytical techniques. FTIR identified CO3 bonds and carbonate stretching, XRF and SEM-EDX measured a high Ca concentration, and SEM imaging showed that Ca is well distributed, suggesting homogeneous formation.

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