Upcycling carbon dioxide to improve mechanical strength of Portland cement

Evaluate the role of biochar during the organic waste composting process: A critical review.

Utilization of residues from rice parboiling industries in southern Brazil for biogas and hydrogen-syngas generation: Heat, electricity and energy planning

Methane–hydrogen fuel blends for SI engines in Brazilian public transport: Potential supply and environmental issues

This paper reveals a regeneration method for a carbonate compound after carbon dioxide (CO2) absorption in a biogas upgrading unit run with caustic mixtures, obtaining precipitated calcium carbonate (PCC) as valuable by-product. This process arises as an alternative to physical regeneration, which is highly energy intensive. This work provides novel insights on the regeneration efficiency of carbonates to hydroxides while also studying the influence of K+ or Na+ in the caustic CO2-trapping solution. The compared parameters were the reaction time, temperature and molar ratio. Moreover, psychochemical characterization of solids was obtained by means of Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray powder diffraction (XRD) and Scanning Electron Microscopy (SEM) images. The results indicate that regeneration efficiencies are slightly lower when potassium is used instead of sodium, but quite acceptable for both of them. The chemical characterization experiments showed the predominance of calcium carbonate. Overall, the results obtained in this study proved that this process is feasible to upgrade biogas through PCC precipitation, which appears to be a promising economically viable process to synergise CCS and CCU.

Understanding the Influence of the Alkaline Cation K+ or Na+ in the Regeneration Efficiency of a Biogas Upgrading Unit

Effect of biochar combined with a biotrickling filter on deodorization, nitrogen retention, and microbial community succession during chicken manure composting.

Yabing Zhang

Papers

Effect of biochar combined with a biotrickling filter on deodorization, nitrogen retention, and microbial community succession during chicken manure composting.

Continuous process of biogas purification and co-production of nano calcium carbonate in multistage membrane reactors.