The picture illustrates the design and mechanism of a modern landfill for household use. Overall, the landfill comprises several layers, with two drainage systems and a self-degraded process of household waste, and the closed process occurs underground.
Regarding the construction, a trapezoid artificial hole is dug deep into the ground above a natural rock layer. Subsequently, a thin clay layer covers the hole, followed by another layer made from synthetic substance, containing a drainage tank and a system of pipes above.
As for operation, once the household waste has been disposed into the hole, it is then sealed by another layer of clay on the surface. After a period of time, the trash naturally decomposes into a mud-like form. Meanwhile, the leachate, the by-product of this process, percolates down to the drainage tank and is stored there, from where it turns into gas form and is exuded into the environment through the pipe system.