ISPRS Archives XXXVIII-8/W3 Workshop Proceedings: Impact of Climate Change on Agriculture 200 CO2 SEQUESTRATION THROUGH MINERAL CARBONATION OF FLY ASH AND ITS USE IN AGRICULTURE

Emission of CO2 from different sources has increased the effect of green house gases and global warming. Fixation of CO2 from atmosphere in the form of solid carbonates appears to be an option for reduction of CO2 concentration. Mineral carbonation is a process of chemical reaction in which minerals or its residues consisting of lime and magnesia become a source of carbonation. The material fly ash and gypsum are industrial wastes and causes disposal problem leading to environmental pollution. Gypsum (bassanite) is a calcium bearing material and fly ash contains silica and alumina. Combination of these materials provides a favorable ingredient for mineral carbonation. The combination of fly ash and gypsum in long term storage under atmospheric condition becomes a site for capturing atmospheric CO2. The bulk use of this carbonated ash was carried out in agricultural purpose to explore the feasibility of utilizing fly ash in improving the productivity of an acid lateritic soil through pot culture study. With this concept field experiments had conducted in medicinal plant garden site in two fast growing tree species i.e. Acacia mangium and Dalbergia sisso in carbonated ash with different concentration. Taking various parameters like PH, EC, and WHC into consideration, the periodical growth rate of Acacia mangium showed better response. The present paper will highlight the growth performance and sustainable use of fly ash in agriculture. ∗ [email protected]