Article ID Journal Published Year Pages File Type
9755048 Microchemical Journal 2005 7 Pages PDF
Abstract
Fly ash and sludge samples from two different incineration plants of urban solid waste (USW) were submitted to two different stabilization-solidification processes based both on the use of Portland cement. The efficiency of these processes to stabilize/solidify the residues and to reduce the release of pollutants was evaluated by performing mechanical and leaching tests according to the Water Research Institute (IRSA-CNR) standard method. The leaching test was based on the treatment of the sample with an acetic acid solution adjusted at pH=5.2 (about 0.5 M), for 24 h under magnetic stirring. Two analytical procedures for the determination of trace metals (Pb, Cd, Cu and Se) and organic pollutants [polycyclic aromatic hydrocarbons (PAHs), polychlorobiphenils (PCBs) and organic chlorinated pesticides (OCPs)] in the various samples were optimized. Trace metals were determined by differential pulse anodic/cathodic stripping voltammetry (DPASV/DPCSV), and organic pollutants by gas chromatography coupled with mass spectrometry (GC-MS). The concentration of trace metals in raw residues and the corresponding leaching solutions were higher than the regulatory limits, whereas the stabilized-solidified residues showed a compressive strength for both mixtures higher than the suggested limit value and the concentration of all the pollutants lower than the regulatory limits, after 28 days curing time. Finally, a polyurethane resin was added as an additive to the Portland mixture, and the effect on the pollutant release was investigated.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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