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SOIL & GROUNDWATER TRANSPORT OF LEACHATE FROM FLY ASH AND FLUE GAS DESULFURIZATION WASTE DISPOSAL SITES

Objective

THE ULTIMATE RESULT OF THE PROPOSED PROJECT WILL BE AN OPERATIONAL GROUNDWATER QUALITY MODEL WHICH MAY BE USED TO ASSESS THE ENVIRONMENTAL IMPACT OF DIFFERENT OPTIONS FOR DISPOSAL OF FLY ASH AND FGD-WASTE.FURTHERMORE, DATA ARE GENERATED WHICH MAY SERVE AS INPUT TO OTHER MODELS AS WELL.

THE TECHNIQUES THAT WILL BE EMPLOYED AND TESTED, THE DATA THAT WILL BE GENERATED, AND THE MODEL THAT WILL BE DEVELOPED WILL CONTRIBUTE TO AND FIT WELL INTO THE EXISTING AND PROJECTED R&D AND APPLICATION PROFILE AT VKI. FOR OTHERS, THE DATA GENERATED AS WELL AS ASSESSMENTS OF ENVIRONMENTAL IMPACTS OF VARIOUS DISPOSAL SCENARIOS ARE RELEVANT.

THE EXPECTED RESULTS WILL BE USED BY INSTITUTES, AUTHORITIES, POWER COMPANIES, CONTRACTORS, AND CONSULTANTS DEALING WITH SOLID WASTE DISPOSAL PROBLEMS IN RELATION TO GROUNDWATER QUALITY.
The project comprised laboratory and large scale lysimeter studies of the leaching properties of coal fly ashes and flue gas desulphurization (FGD) products from the spray dryer absorption (SDA) process, laboratory and lysimeter investigations of the mobility of 2 key components chromium (VI) and molybdenum (VI), of coal combustion residue leachates in soils, simulation of the migration of chromium (VI) and molybdenum (VI) in soil using numerical modelling of laboratory results, field investigations at an old coal fly ash disposal site, and theoretical calculations of ageing processes of coal fly ash. The overall purpose was to improve the tools available for reliable assessment of the environmental impact of disposal of coal combustion residues.
A MAIN OBJECTIVE OF THE PROPOSED PROJECT IS TO DEVELOP, IN A JOINT EFFORT WITH ECN, OPERATIONAL MATHEMATICAL DESCRIPTIONS OF THE MOBILITIES IN SOIL AND GROUNDWATER OF MAJOR AND TRACE POLLUTANTS RELEASED FROM DEPOSITED FLY ASHES AND FLUE GAS DESULFURIZATION WASTES. ATTEMPTS WILL BE MADE TO CORRELATE THE MOBILITIES TO CHARACTERISTIC PROPERTIES OF THE SOILS AND LEACHATES INVESTIGATED.
A SECOND OBJECTIVE IS TO INCORPORATE THE CONTAMINANT MOBILITY FUNCTIONAL RELATIONSHIPS INTO A SUITABLE EXISTING MATHEMATICAL MODEL DESCRIBING TRANSPORT OF CONSERVATIVE MATTER IN AQUIFERS, AND TO VERIFY THE MODEL BY COMPARING THE RESULTS OF SIMULATION RUNS TO FIELD DATA OBTAINED AT AN ACTUAL DISPOSAL SITE.
A THIRD OBJECTIVE OF THE PROJECT IS TO STUDY LONG TERM LEACHING OF FLY ASH AND FGD-WASTE AT LARGE SCALE LYSIMETERS WHICH ARE ALREADY IN OPERATION. THIS WILL BE SUPPLEMENTED WITH MODEL CALCULATIONS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Water Quality Institute
Address
11,Agern Allé
2970 Hørsholm
Denmark

Participants (1)

ENERGIEONDERZOEK CENTRUM NEDERLAND (ECN)
Netherlands
Address

Petten