Karamalidis Athanasios K, Voudrias Evangelos A
Department of Environmental Engineering, Democritus University of Thrace, GR 671 00 Xanthi, Greece.
J Hazard Mater. 2007 Mar 22;141(3):591-606. doi: 10.1016/j.jhazmat.2006.07.034. Epub 2006 Jul 21.
A framework for the evaluation of leaching behavior of inorganic constituents from stabilized/solidified refinery oily sludge and ash produced from incineration of oily sludge with cement was employed. Metal and anion release as a function of pH was investigated. The leaching test consisted of multiple parallel extractions at pH range from 2 to 12. Remarkably good immobilization >98% was observed for metals of solidified ash at pH>6 and >93% of solidified oily sludge at pH>7. Sulfate leaching was high at pH range 2-12. The leaching behavior of metals and anions was simulated by VMINTEQ. The calculations showed that leaching behavior of Zn, Ni and Cu was controlled by chemical equilibrium and surface complexation onto ferrihydrite, at the pH range 2-12. The dominant solid phases that controlled metal leachability were metal hydroxides. The dominant mechanism that described sulfate leaching was found to be chemical equilibrium. Sulfate and also chromate leachability was controlled by Ettringite and Cr(VI)Ettringite as the major minerals affecting their release.
采用了一个用于评估从稳定化/固化炼油厂含油污泥以及用水泥焚烧含油污泥产生的灰烬中无机成分浸出行为的框架。研究了金属和阴离子释放随pH值的变化情况。浸出试验包括在pH值为2至12的范围内进行多次平行萃取。在pH>6时，固化灰烬中金属的固定率显著良好，>98%；在pH>7时，固化含油污泥的固定率>93%。在pH值范围2 - 12内，硫酸盐浸出率较高。用VMINTEQ模拟了金属和阴离子的浸出行为。计算结果表明，在pH值范围2 - 12内，锌、镍和铜的浸出行为受化学平衡和在水铁矿上的表面络合作用控制。控制金属浸出性的主要固相是金属氢氧化物。发现描述硫酸盐浸出的主要机制是化学平衡。硫酸盐以及铬酸盐的浸出性受钙矾石和铬酸钙矾石控制，这是影响它们释放的主要矿物。
