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Behavior and distribution of heavy metals such as rare earth, thorium and uranium in sludge of industrial water treatment plant and recovery method of Biosurfactant

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Document pages: 11 pages

Abstract: In order to study the behavior, distribution and characteristics of heavy metals (including rare earth elements (REE), thorium (th) and uranium (U) in sludge, the total and fractional concentrations of these elements in sludge collected from industrial water treatment plant were measured and compared with those in natural soil The process of removing recovering heavy metals (Pb, Cr and Ni) from contaminated sludge was studied by batch and column experiments to evaluate the efficiency of Biosurfactant in removing heavy metals. Therefore, the following matters have been roughly clarified. (1) the concentration of heavy metals in sludge is usually higher than tho and exists as a more unstable componente in natural soil. (2) Nonionic saponin including carboxyl group is more efficient than sophorolipid for the removal of heavy metals in polluted sludge. Saponin has selectivity for the mobilization of heavy metals and mainly reacts with heavy metals in F3 (the fraction bound to carbonates) and F5 (the fraction bound to Fe-Mn oxides). (3) The recovery efficiency of heavy metals (Pb, Ni, and Cr) reached about 90–100 using a precipitation method with alkaline solution.

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