Long Term Environmental Impact by Use of Waste Materials': An Assessment System

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Publisher Summary

A current Dutch environmental problem is how to deal with the increasing production of coal-fly ash, caused by the growth in powder-coal based production of electricity. This prompted Rijkswaterstaat to commission the development of an assessment system, which calculates future emissions related to policy scenarios for future use of waste materials in building and construction and which may be used in life-cycle management of waste materials. The use of the system starts with the definition of a flow scheme, which shows current and conceived use of the waste material. Future leaching is calculated in a two-step procedure. The first step is the calculation of future flows of fly ash and fly-ash products. The second step is the calculation of the emissions. For each specific fly-ash use to be considered, the so called “emission functions”, which model the time dependent rates of leaching of the species considered from specific fly-ash constructions, are required. To demonstrate the system, a small number of emission functions are estimated, which are based on limited experimental information obtained in laboratory and practice while accounting for the specific construction characteristics of the uses, such as the width of a road.

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