Behavior and Distribution of Heavy Metals Including Rare Earth Elements, Thorium, and Uranium in Sludge from Industry Water Treatment Plant and Recovery Method of Metals by Biosurfactants Application

• DOI: 10.1155/2012/173819
• Publication Date: 2012-05-29T03:13:08Z
• Authors: Lidi Gao; Naoki Kano; Yuichi Sato; Chong Li; Shuang Zhang; Hiroshi Imaizumi
• Keywords: Fraction (chemistry)

In order to investigate the behavior, distribution, and characteristics of heavy metals including rare earth elements (REEs), thorium (Th), uranium (U) in sludge, total fractional concentrations these sludge collected from an industry water treatment plant were determined compared with those natural soil. addition, removal/recovery process (Pb, Cr, Ni) polluted was studied biosurfactant (saponin sophorolipid) elution by batch column experiments evaluate efficiency for removal metals. Consequently, following matters have been largely clarified. (1) Heavy metallic generally larger exist as more unstable fraction than (2) Nonionic saponin carboxyl group is efficient sophorolipid sludge. Saponin has selectivity mobilization mainly reacts F3 (the bound carbonates) F5 Fe-Mn oxides). (3) The recovery Ni, Cr) reached about 90–100% using a precipitation method alkaline solution.