Recent developments towards standardisation in geochemical modelling of leaching processes

Since geochemical modelling is increasingly being used to support the development of environmental policy and regulatory limit values for contaminants in waste and construction materials that are utilised or landfilled, it is mandatory to ensure that model predictions are transparent and reproducible, and that uncertainties are analysed and...

Development of a leaching test for metal surfaces

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Characterisation of major component leaching and buffering capacity of RDF incineration and gasification bottom ash in relation to reuse or disposal scenarios

Thermal treatment of refuse derived fuel (RDF) in waste-to-energy (WtE) plants is considered a promising solution to reduce waste volumes for disposal, while improving material and energy recovery from waste. Incineration is commonly applied for the energetic valorisation of RDF, although RDF gasification has also gained acceptance in recent...

Evaluation of the performance and limitations of empirical partition-relations and process based multisurface models to predict trace element solubility in soils

Here we evaluate the performance and limitations of two frequently used model-types to predict trace element solubility in soils: regression based “partition-relations” and thermodynamically based “multisurface models”, for a large set of elements. For this purpose partition-relations were derived for As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se,...

Development of leaching tests for (recycled) metal surfaces: Theory, test results and practice

Based on developments at European level (TC 351) and discussions with both regulators and the industry, ECN is involved in investigating the possibilities for the development of short-term (laboratory) leaching tests that are suitable to estimate the leaching of metals from (bare) metal products. Both laboratory and field data indicate that the...

A consistent geochemical modelling approach: for long-term assessment of release from contaminated materials to soil and groundwater

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Evaluation of a Horizontal Approach to Assess the Possible Release of Dangerous Substances from Construction Products in Support of Requirements from the Construction Products Directive

This report gives recommendations on the development of horizontal testing procedures for the release or content of dangerous substances from construction products. The target groups of the recommendations are the working groups and task groups of CEN/TC 351 Construction products: assessment of the release of dangerous substances߿ݮ The report...

A consistent geochemical modelling approach for the leaching and reactive transport of major and trace elements in MSWI bottom ash

To improve the long-term environmental risk assessment of waste applications, a predictive multi-surface߿ݠmodelling approach has been developed to simultaneously predict the leaching and reactive transport of a broad range of major and trace elements (i.e., pH,Na, Al, Fe, Ca, SO4,Mg, Si,PO4, CO3, Cl,Ni, Cu,Zn, Cd,Pb,Mo) andfulvic acids...

Nut en noodzaak van acceptatiecriteria voor kobalt, tin, vanadium, broom, wolfraam en cyanide (vrij en totaal) als onderscheidEND<br />SET acceptatiecriterium op stortplaatsen

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Evaluation of the chromium speciation in Israeli coal fly ashes

Upon the request of the Israeli National Coal Board the Cr speciation in Israeli coal fly ashes was evaluted. Six fly ashes - fresh ash, fly ash used in road application and fly ash collected from an embankment were tested. For this purpose, the ash leaching behaviour has been characterized as a function of the pH in a so-called pH dependence...