Abstract
There are a number of leaching test which are used to evaluate the effect of foundry waste disposal on the environment (TCLP, SPLP, ASTM at al.). Because the spent foundry sand are usually deposited at the ground level and they have a similar structure to the soil, survey mobility of metals using the same methods seems appropriate. One-step extraction allows for the evaluation of the mobility and bioavailability of metals in soil and waste. Waste foundry sands have been successfully used as a component in manufactured soils in U.S., but concern over metal contamination must be eliminated before considering this direction of use. The study evaluated the leaching of heavy metals (Cd, Pb, Cu, Zn, Cr, Ni) from deposited waste foundry sands. The overall, as well as heavy metals were extracted by different type of extractants: H 2 O, CH 3 COOH, HCl, EDTA, MgCl 2 and NaCOOH. These extractants are most commonly used to study the mobility and bioavailability of metals in soil and waste. In the present study applicable standards and methodology described in the literature in analysis were used. The results allowed to evaluate the bioavailability of metals leached from those wastes.
Highlights
After Poland’s accession into the European Union, it took an obligation upon itself to pass and implement the environmental laws of the EU
Lindsay and Logan [15] state that the application of waste foundry sands in agriculture needs to be supported by research, which has to confirm their applicability for the designated purpose and the ones which provide means of monitoring their impact on the environment
The examined waste was characterized by a various heavy metal content
Summary
After Poland’s accession into the European Union, it took an obligation upon itself to pass and implement the environmental laws of the EU. In 2007, US EPA confirmed that benefits resulting from the application of waste foundry sands in agriculture and gardening as well as in geotechnical applications The advantages of this application include the protection of natural resources as a result of reducing the demand for the raw materials, saving of energy and reduction of greenhouse gas emissions as a result of the reduction of mining activities and decrease of storage costs. Lindsay and Logan [15] state that the application of waste foundry sands in agriculture needs to be supported by research, which has to confirm their applicability for the designated purpose and the ones which provide means of monitoring their impact on the environment. It is often emphasized that waste foundry sands can be applied in the environmental after the materials comprise natural binders, e.g. bentonite or materials following
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