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Laboratory scale study of an industrial phosphate and thermal treatment for polluted dredged sediments

International Journal of Sediment Research 2012年第4期27卷 538-546页

作者： Souhila KRIBI Jocelyn RAMAROSON Ange NZIHOU Patrick SHARROCK Guy DEPELSENAIRE Ecole des Mines d'Albi-Carmaux RAPSODEE UMR-CNRS 2392Route de Teillet-81013 ALBI CT Cedex 09France Ph.D. Paul Sabatier University Solvay DCRTRue de Ransbeek 310BrusselsBelgium

dredged sediments are being chemically treated with phosphoric acid on an industrial *** effectiveness of the treatment was evaluated by performing the chemical reaction in a tubular reactor, followed by convective drying and maturation of the treated sediment at ambient temperature and finally thermal destruction of the organic matter by calcinations(500℃-900℃).The influence of acid concentration and calcination temperature on the specific surface area of the sediment was investigated. The stabilization of the heavy metals was evaluated by leaching tests and sequential extraction *** phosphoric acid treatment is effective in reducing heavy metal mobility,a prerequisite for recycling the sediments in various construction materials.

关键词： dredged sediments Heavy metal pollution Chemical treatment Thermal treatment

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Utilization of dredged sediments from Lumsai Canal with Rice Husks to Produce Bricks

Utilization of Dredged Sediments from Lumsai Canal with Rice...

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作者： W.Tangprasert S.Jaikaew N.Supakata the Department of Environmental Science Faculty of ScienceChulalongkorn University

The laboratory-scale study was conducted to assess the feasibility of using dredged sediments from Lumsai canal with rice husks to produce *** study was investigated into three different proportions of dredged sediments with rice husks ranging from 0, 5, 10, 15, and 20 percent(by weight of rice husks or rice straws) as raw materials in producing *** characteristics of the dredged sediments, rice husks, and fired bricks were analyzed using X-ray fluorescence(XRF) and X-ray diffraction(XRD), *** physical-mechanical properties of fired bricks were found to comply with the criteria for bricks(Thai Industrial Standards 77-2545).The obtained results indicated that major chemical compositions of dredged sediments were silica(SiO) 56.27 percent, alumina(AlO) 11.76 percent and iron oxide(FeO) 7.84 percent, and heavy metal contents including Cr, Cu, Zn, As, Cd, Hg, Pb, Mn, Sr, and Ni were lower than the soil quality *** of this study showed that bricks made from dredged sediments with 5 percent of rice husks were suitable as primary raw materials in the production of bricks without harmfulness.

关键词： Bricks dredged sediments rice husks

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