Liu Jing-Yong, Sun Shui-Yu, Chen Tao
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2013 Mar;34(3):1166-73.
Experiments were carried out on laboratory-scale electrically heated tube furnace sewage sludge combustion with different adsorbents. Four solid adsorbents (calcium oxide, Alumina, fly ash and kaolin) were used to control the emission of heavy metals (Pb, Cd, Cu, Cr, Ni, Zn) during the sewage sludge incineration. The results showed that the heavy metals tended to be fixed and left over in the incineration bottom ash with the addition of calcium oxide, Alumina, fly ash and kaolin. With the increase of the solid adsorbent ratio, the residual rate of heavy metals in the bottom ash also increased. Incineration temperature had a great influence on the heavy metal adsorption effect of the solid adsorbent. The forms, melting point and boiling point of the heavy metals were found to be important factors that determined its volatility. There was huge difference in the inhibitory effect of different adsorbents on heavy metals migration. From the view of controlling heavy metal evaporation, the adsorbents kaolin and CaO were superior to the other adsorbents. The interaction between the active center of the solid adsorbent and the molecules of the heavy metal compounds depended on the distribution of these active sites and the chemical properties of the heavy metals.
在实验室规模的电加热管式炉中，使用不同吸附剂对污水污泥燃烧进行了实验。使用四种固体吸附剂（氧化钙、氧化铝、粉煤灰和高岭土）来控制污水污泥焚烧过程中重金属（铅、镉、铜、铬、镍、锌）的排放。结果表明，添加氧化钙、氧化铝、粉煤灰和高岭土后，重金属倾向于固定并残留在焚烧底灰中。随着固体吸附剂比例的增加，底灰中重金属的残留率也增加。焚烧温度对固体吸附剂的重金属吸附效果有很大影响。发现重金属的形态、熔点和沸点是决定其挥发性的重要因素。不同吸附剂对重金属迁移的抑制效果存在巨大差异。从控制重金属蒸发的角度来看，吸附剂高岭土和氧化钙优于其他吸附剂。固体吸附剂的活性中心与重金属化合物分子之间的相互作用取决于这些活性位点的分布以及重金属的化学性质。
