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Purification of biogas by removing carbon dioxide content has been developed to increase its calorific value. The CO 2  contained in biogas was absorbed by contacting Ca(OH) 2 solution and CO 2 in the bubble column to produce high purity of biogas and generated precipitated calcium carbonate (PCC) simultaneously. Two sources of CO 2 were used in this work, which were CO 2 contained in biogas and pure CO 2 . Pure CO 2 was used as a benchmark in this study to show the effect of the presence of methane contained in biogas on the absorption process. The investigation was done in a continuous process. The results showed that the highest absorption of CO 2 was obtained in biogas at 79.34 %. PCC with calcite phases was successfully formed in 225–270 nm. Rhombohedral calcite phase was formed by the use of pure CO 2 and biogas as a source of CO 2 . The use of CO 2 contained in biogas and pure CO 2 in the absorption process did not have an effect on the crystalline phase and morphology of calcite formed. Several factors that significantly affected the absorption of CO 2 were gas flow rate, absorbent flow rate, CO 2 concentration in the gas inlet, and the initial liquid level in the bubble column.

Bubble column application on purification of biogas and production of nano-calcium carbonate in continuous process