Quantitative evaluation of CO2 sequestration in ca-rich waste mineral for accelerated carbonation

Abstract

Accelerated carbonation is a technique that can be used as a CCS technology for CO2 sequestration of approximately 5 ∼ 20% in a stable solid through the precipitation of carbonate. An alkaline inorganic waste material such as ash, slag, and cement paste are generated from incinerators, accelerated carbonation offers the advantage of lower transport and processing costs at the same generation location of waste and CO2. In this study, we evaluated an amount of CO2 sequestration in various types of inorganic alkaline waste processed by means of accelerated carbonation. A quantitative evaluation of CO2 real sequestration based on a TG/DTA analysis, the maximum 118.88 g/kg-waste of CO2 in paper sludge fly ash, the maximum 134.46 g/kg-waste of CO2 in municipal solid waste incinerator bottom ash, the maximum 9.72 g/kg- waste of CO2 in industrial solid waste incinerator fly ash, and the maximum 18.19g/ kg-waste of CO2 in waste cement paste.