Carbon Dioxide Sequestration In Alkaline Waste

The present study focuses on exploring an array of alkaline waste residues, procured from diverse sources as means for sequestering maximal CO2. Alkaline waste residues undertaken for the study included: (1) Cement Bag Filter Dust, (2) Finished Cement Sample, (3) Marble Dust and (4) Baghouse Dust. Experiments were conducted in a self fabricated Carbonation reactor under 80% CO2 concentration and at 40°C, water: solid (w/s) ratio of 0.2 to 1.2 with relative humidity in the reactor was maintained at 100%. Carbonation reactions were carried for 16hrs with sampling done every at intervals of 4hrs. The highest degree of carbonation achieved with Cement Bag Filter Dust was 25.84% at w/s ratio of 0.4 without any amendments to the waste material. Degree of carbonation achieved under similar conditions for other waste residue was 17.21% by Finished Cement Sample followed by Marble Dust 10.98% and finally by Baghouse Dust was 7.54%. It was concluded that a low w/s ratio of 0.4 was optimum for carbonation reaction due to increased access to reaction sites. Detailed experiments are further needed inorder to address the inconsistency in the observed carbonation achieved by different waste due to their heterogeneous nature.