Study on Geotechnical Engineering Properties of Typical Sludge Hazardous Waste

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.