Treatment by stabilisation/solidification (S/S) with cement-based binders is an option for wastes from the chemical and metal industries that can not be prevented or reduced. This project aims to develop process envelopes for generic S/S of the most common or problematic residual waste types and gain a better understanding of contaminant immobilisation mechanisms and longterm performance. This will increase technology transparency to allow an informed choice between treatment options, guide use and marketing of S/S by industry, prevent technology failures, enable confident approval of S/S by regulators, and provide fundamental data for development of predictive models of longterm behaviour for risk assessment. The depth and breadth of the rigorous testing programme proposed is beyond the scope of individual industrial initiatives, but will guide future technology development and enhance competitiveness in the global market.
The waste types that will be addressed are: 1) metal-containing salts and sludges from physicochemical treatment of industrial wastes, 2) air pollution control residues from municipal solid waste incineration, 3) electric arc furnace dust from the iron and steel industry, and 4) contaminated soil. The immobilising binder systems will incorporate various proportions of Portland cement (CEM I), ground granulated blastfurnace slag, coal-fired power station fly ash, lime and silica fume.
The project started August 2006
The project is being conducted by a consortium of 22 partners led by University College London.
CIRIA is a the partners responsible for dissemination and consultation. Other partners include Birkbeck College, BCA, BLA, Cambridge University,Civil and Marine Holdings, CL:AIRE, The Concrete Centre, Corus, Elkem Materials, Environment Agency, Grundon Waste Management, Imperial College, May Gurney, Scott Wilson, Sita UK, Surface Engineering Association, Surrey University, Veolia ES Selchp, Veolia Environmental Services, UKQAA, White Young Green Environmental and WRc. Further details will shortly be available at: www.civeng.ucl.ac.uk/process.
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