It is expected that integrated carbon capture and conversion (iCCC) will reduce the overall cost of carbon capture & conversionby leveraging the CO2 conversion process to simultaneously regenerate CO2-rich solutions. To assess the feasibility of coupling biomethanation and carbon capture, the absorption performance of a slightly alkaline absorbent (pH = 10) prepared with 4.2 g/ L NaHCO3, 6 g/ LNa2CO3 and a microbial nutrient solution for CO2 in simulated flue gas in a packed column was investigated. Second, the CO2-rich solution was subjected to a five-cycle regeneration experiment using the biomethanation process in anaerobic bottles. The results show that inthe flow-through mode, when the gas flow rate of packed column is≤ 1.0 L/ min, with the increase of liquid flow rate, CO2 removal ratesof all experimental groups gradually increase and can be stabilized above 80%, and the liquid flow rate of this packed column is suitable tobe ≤ 0.9 L/ min. Overall volumetric mass transfer coefficients of the packed column at different gas flow rates (0.4-1.2 L/ min) are generally stable between 17- 19 mol/ ( h·kPa·m3 ). As a result of CO2 absorption, NaHCO3 in the absorption solution increases andNa2CO3 decreases, with a ratio between 1.2 and 1.9. Under the condition that the CO2 removal rate is greater than 80%, the slightly alkaline absorbent can be recycled 6 times at a gas flow rate of 0.6 L/ min and liquid flow rate of 0.7 L/ min. The utilization rate of the active component CO2-3 reaches 89.5%, and the total inorganic carbon(TIC) of the formed CO2 -rich solution is 0.127 mol/ L at a pH of8.82, creating an environment conducive to the growth of biomethanation microorganisms. The results of the cyclic experiments on the bioregeneration of the CO2-rich solution reveal that the absorbed CO2 of the absorbent is basically stable in the range of 69.6-78.6 mmol/ Lafter each regeneration and the CH4 production is reproducible during the regeneration process. As a result of the regeneration experiment,alkali-resistant bacteria at the phylum level, such as Firmicutes and Actinobacteriota, are somewhat enriched. Approximately 99% of archaeal genera are dominated by hydrogenotrophic methanogens before and after regeneration, but the slightly alkaline environment duringregeneration results in a 19.5% decrease in the relative abundance of Methanobrevibacter and a 18.7% increase in the relative abundanceof unclassified_f_Methanobacteriaceae, respectively. In conclusion, the above experimental results indicate the feasibility of biomethanation combined with carbon capture.