典型污泥类危险废物的工程力学特性

Study on Geotechnical Engineering Properties of Typical Sludge Hazardous Waste

准确掌握污泥产量和污泥特性信息是确定污泥处理处置方法的前提条件。以GB/T 50123—1999《土工试验方法标准》为依据,对三类典型污泥类危险废物进行了室内工程力学特性的测定。结果表明,污泥类危险废物含水率可高达70%;颗粒粒径相差较大,级配不均,有效粒径为0.075～0.25mm,直接剪切试验黏聚力最高约为3kPa,抗压强度相差较大,除有机质浓度低于城市生活垃圾(MSW)外,容重、渗透系数均高于MSW的变化范围,对填埋场的稳定性造成巨大的安全隐患。基于污泥类危险废物的这些典型物理力学特性,对危险废物填埋场实际填埋过程的规范操作提出了几点建议。

It is the prerequisites for determining sludge treatment and disposal methods to accurately grasp hazardous sludge production and sludge characteristics. The indoor geotechnical engineering properties of three categories of typical sludge hazardous waste were determined based on Soil Test Method Standards （GB/T 50123-1999 ）. The results showed that the three categories of sludge hazardous wastes had high water content up to 70%, particle size distributed unequally and differed greatly for different kinds, and the effective diameter was in the range of 0. 075- 0.25 mm. The maximum shear strength of the direct shear was only about 3 kPa, and compressive strength varied widely. Except for organic matter content which was lower than normal MSW content, the bulk density and permeability coefficient were both higher than the range of MSW variation, which caused a huge security risk for the stability of the hazardous landfill. According to these typical physical mechanics characteristics of sludge hazardous wastes, some practical operating recommendations to the hazardous waste landfill were given.