We recently developed a calcium looping system to capture CO2 in the flue gases produced by waste-to-energy (WtE) plants using Ca-rich sorbents derived from various ashes collected from the same plants. Raw ashes were characterised in terms their elemental compositions, phase compositions, active calcium contents, heavy metal leaching, as well as the variation of the characteristics of the ashes collected at different times. Of all the ashes investigated, raw ashes collected by the air pollution control unit (APC) showed the highest CO2 capture capacity (up to 400 mg-CO2/g-sorbent). However, APC ashes were also found to corrode the steel reactors, owing to their high chlorine contents. Therefore, chlorine removal is deemed essential as part of the sorbent pre-treatment process. In addition, calcium aluminate cement was used as part of the sorbent formulation to render additional resistance against attrition in fluidised beds. With the optimised sorbent formulation, we have set up a production facility to prepare sorbents at 10 kg scale for testing in a 20 kWth calcium looping pilot, which adopts a circulating fluidised bed design and has been fully validated by computational fluid dynamics (CFD) models. The calcium looping hot model will be used to capture flue gas generated from the Waste-to-Energy Research Facility (WTERF) at Nanyang Technological University (NTU), Singapore. Preliminary techno-economic analysis shows that the levelised cost of CO2 abatement for capturing CO2 from a WtE plant using ash-derived sorbent is between US – 184/tCO2, which is significantly lower that the numbers reported for amine scrubbing.