【摘要】 研究了石灰、粉煤灰和污泥焚烧灰对印染污泥的固化效果,考察了不同固化材料对污泥固化块的抗压强度、抗剪强度的影响,并测定了污泥固化块的重金属浸出毒性。采用扫描电镜(SEM)、X射线衍射(XRD)和能谱分析(EDS)分析了固化块组成和微观结构,对固化机理进行了初步分析。结果表明,在试验范围内,采用单一固化剂时,石灰对增强污泥力学强度效果最显著,而粉煤灰和焚烧灰的效果不佳;采用复合固化剂时,污泥-石灰-粉煤灰-焚烧系统(质量比为1∶0.08∶0.5∶0.5)对增强污泥力学强度效果最佳。XRD和SEM分析结果显示,掺入固化剂的污泥固化块结构更加密实,并新生成了碳酸钙、水化硅酸钙等固化物质。更多还原

【Abstract】 The effects of three solidifying agents(lime、PFA and incinerated sludge ash) on the solidification of textile dyeing sludge were studied in this paper.The compressive strength、shear strength and the heavy metals leaching toxicity of sludge solidification blocks was measured,and the composition and microstructure of the solidification blocks was detected by SEM、XRD and EDS.The results showed that when using a single curing agent,lime was the most signification agent to improve the mechanical strength of the solidification blocks and that PFA and incinerated sludge ash is unsatisfactory.When using composite agents,the mass ratio of sludge、lime、PFA and incinerated sludge ash is 1:0.08:0.5:0.5.The XRD and SEM analysis showed that the structure of the solidification blocks was denser than before.Calcium carbonate,calcium silicate hydrate and other materials could be found in solidification blocks.更多还原