Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Parameters controlling the release of hazardous waste ($ Ni^{2+} $, $ Pb^{2+} $ and $ Cr^{3+} $) solidified/stabilized by cement-CEM I
Abstract In this article, first, we present the characterization and the process of solidification/stabilization (S/S) of hazardous waste, industrial rejections of Algeria, by hydraulic binder CEM I, Second, we present the study on the influence of leaching tests and the amount of waste on the release of solidified/stabilized waste to the surrounding environment. S/S was performed at the laboratory using two types of formulations. The mechanical strength was evaluated at 7 days then at 28 days of cure. The results of mechanical strength show an increasing up to a maximum threshold, then a decrease due to the increasing of the amount of waste in the S/S materials. pH-dependence test showed two types of solubilization; chemical species that depends on pH ($ Ni^{2+} $, $ Pb^{2+} $, $ Cr^{3+} $, $ Ca^{2+} $) and others which are independent from pH ($ Na^{+} $, $ K^{+} $, $ Cl^{−} $). It was observed that the amounts of heavy metals released into the pH dependence, PW and MMF tests were very large compared to the amount released into the MLT test. XRD and SEM–EDX analysis show the presence of heavy metals within the structure of S/S materials which explains the effectiveness of the S/S process. Mortar showed better efficiency in trapping pollutants compared to cement paste.
Parameters controlling the release of hazardous waste ($ Ni^{2+} $, $ Pb^{2+} $ and $ Cr^{3+} $) solidified/stabilized by cement-CEM I
Abstract In this article, first, we present the characterization and the process of solidification/stabilization (S/S) of hazardous waste, industrial rejections of Algeria, by hydraulic binder CEM I, Second, we present the study on the influence of leaching tests and the amount of waste on the release of solidified/stabilized waste to the surrounding environment. S/S was performed at the laboratory using two types of formulations. The mechanical strength was evaluated at 7 days then at 28 days of cure. The results of mechanical strength show an increasing up to a maximum threshold, then a decrease due to the increasing of the amount of waste in the S/S materials. pH-dependence test showed two types of solubilization; chemical species that depends on pH ($ Ni^{2+} $, $ Pb^{2+} $, $ Cr^{3+} $, $ Ca^{2+} $) and others which are independent from pH ($ Na^{+} $, $ K^{+} $, $ Cl^{−} $). It was observed that the amounts of heavy metals released into the pH dependence, PW and MMF tests were very large compared to the amount released into the MLT test. XRD and SEM–EDX analysis show the presence of heavy metals within the structure of S/S materials which explains the effectiveness of the S/S process. Mortar showed better efficiency in trapping pollutants compared to cement paste.
Parameters controlling the release of hazardous waste ($ Ni^{2+} $, $ Pb^{2+} $ and $ Cr^{3+} $) solidified/stabilized by cement-CEM I
Belebchouche, Ch. (Autor:in) / Moussaceb, K. (Autor:in) / Tahakourt, A. (Autor:in) / Aït-Mokhtar, A. (Autor:in)
2014
Aufsatz (Zeitschrift)
Englisch
| British Library Online Contents | 2015