Abstract:

Lamellar settling tanks are quite commonly used in wastewater treatment technology. They are used in water treatment facilities to remove most settleable solid particles by gravity settling. When repairing the sludge vane and cleaning the cone, removing the cone from the lamella settling tank is necessary. Because the sludge cone is installed at the bottom of the tank and has a large volume and size, a lot of time and effort is required to remove the sludge cone. Therefore, designing a cone window at the sludge cone will help workers clean the inside cone as well as quickly repair the mud wiper. When the sludge cone is a plate with a closed cone wall, the ability to bear the load of sludge on the cone wall is good. However, when opening the cone window, the pressure of the concentrated sludge can cause the cone window to crack, bulge outward and damage the sludge cone. To solve this problem, the Simple Structural Surface (SSS) method is researched and applied to the design of the lamella settling tank's cone window. SSS elements are welded onto the cone window to increase stiffness as well as reduce stress. The article analyzes the deformation and stress on the cone surface with different installation options for SSS elements by using CAE to evaluate, compare and select the most suitable stiffening option. The results of applying the SSS method show the effectiveness and influence of SSS elements in reducing stress and deformation of the cone window.