Abstract
Abstract The present work examines the influence of the leaching conditions on the release of various chemical elements from a cementitious material obtained by solidification of an industrial waste rejection of Algeria. Toxicity Characteristic Leaching Procedure (TCLP), X-ray diffraction (XRD) and Scanning electron microscopy coupled with energy dispersive X-ray microanalysis SEM-EDX analyses were employed to characterize the waste and the stabilized/solidified materials. Than several formulations were prepared with different percent of waste ranging from 0 % to 30 %. To evaluate the influence of leaching conditions on the release of chemical ions (Zn2+, Pb2+, Cl-, Mg2+, Ca2+, Na+, K+ and SO42−) contained in the stabilized and solidified materials, the Acid Neutralization Capacity (ANC), the Pore Water (PW) and Monolith Leaching Tests (MLT) have been carried out. The leaching tests (ANC, PW and MLT) have shown a low metal leachability. However, the lowest released amount was observed for the MLT.
Highlights
IntroductionIndustrial activities produce large amounts of waste
Each year, industrial activities produce large amounts of waste
The present study has evaluated the treatment of petroleum sludge waste with Stabilization/Solidification by hydraulic binder (OPC)
Summary
Industrial activities produce large amounts of waste These contain toxic metallic elements; their presence is a global concern due to possible adverse effects on environment (Järup 2003). S/S with hydraulic binder basically involves waste containment within a solid matrix using cement for potentially toxic metals immobilization This matrix improves high mechanical strength, capacity of retention of metal elements and low permeability and durability (Conner 1990). These works focused on the influence of test conditions on the release of chemical species, such as formulations conditions, material composition, leachate properties (acid, base or demineralized water) (Moussaceb et al 2012, 2013; Belebchouche et al 2015). Addition of I42.5 cement reduces naphthalene and dibenzo[a,h]anthracene leachability
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