WP1 Coordination & Dissemination

The general objective of this WP is the implementation of the day-to-day (administrative and financial) and strategic management of the project to ensure a successful execution of the project and large dissemination of its results.

WP2 Characterisation of by-products from different European power plants

This WP includes the identification of the coal/ lignite type and the combustion technologies used for the determination of the fly ash type. Afterwards, the most suitable type of fly ash will be selected and subsequently different types of zeolites will be produced in WP4 with primary target to achieve the best possible form/structure of them for the CO2 sequestration. Following the selection of fly ash and the production of synthetic zeolites, there will be analyses in the view of the specific properties of them.

WP3 CO2 capture in coal fly ash

The primary target of this WP, is the investigation of fly ash suitability and possibility for the CO2 sequestration. This can be achieved by using fly ash via mineral carbonation. The most important characteristic for the purpose of mineral carbonation, is the high content of fly ash in alkali components, like Ca, Mg, Na and K. Physical and chemical characteristics of fly ash will be evaluated for their role in adsorption as well. The characteristics of fly ash, which affect the CO2 sequestration, are the porosity, the relative high surface area and reactivity. These tests will be conducted from UJV and VUHU, who feature the suitable equipment to carry out them either in lab or in industrial conditions with the dry-based process. The constructed and utilised pilot plant could be used to test CO2 capture on solid phase adsorbents, the pilot plant could be used also for the tests of the adsorbent thermal regeneration (no sense for the samples of fly ash, but could be used for the zeolite tests).

WP4 Application of zeolites for CO2 capture

In this WP synthetic zeolite will be produced with the utilization of fly ash as raw material. The methodology that will be used is a hydrothermal reaction of fly ash with aqua solution of NaOH. Afterwards, the synthetic zeolite will be tested for its CO2 absorption capability and capacity. The aim are to enhance the adsorption capacity of the tested zeolite regarding the CO2 attenuation and to valorize the suitability of this product for this purpose. Additionally, extra tests will be conducted in order to improve the adsorption capacity of the synthetic zeolites for the CO2 sequestration. The most important characteristics which highly affect the adsorption of CO2 and should be controlled at the synthetic zeolites, are the size, the charge density and the distribution of the cations (Na, K, Ca, Mg) in the porous structure.

WP5 Valorisation of the products after mineralisation and disposal possibilities

In this WP both fly ash and synthetic zeolites will be valorised in terms of the degree of mineralisation and leachability of heavy metals, after the adsorption of CO2 in their structure. This valorisation will drive to the conclusion of whether these products are safe for disposal in landfills and backfilling of mines or not. In order to check the mobility of the elements in these products, a series of leaching tests will be performed. According to recent bibliography, the availability of the metals is highly connected with the leaching time, the solubility kinetics, the solid/liquid ratio and the pH. All these factors will be extensively examined for their effects on the metal solubility and mobility. Furthermore, the formation of new minerals due to the injection of CO2 in the structures of fly ash and synthetic zeolites will be investigated. Mineralogical analyses will be conducted before and after the injection in order to find the mineralogical phases that are formed. This comparative study will provide all the necessary data for the final decision of which is the best environment for the disposal of these products.