The sewage disposal and purification processes

The sewage disposal and the sewage purification processes is quite complicated but it is easy to be understood if we follow the processes step by step. These processes consist of the settling phase, the pumping phase, and the filtering phase. First, the sewage from houses must gets through several sewerage pipes before reaching the main sewer. After reaching the main sewer, this sewage is passed to the settling tank. At the settling tank, this sewage is settled so that the polluted water (the liquid form of sewage) can be separated from undecayed solids (the solid form of sewage which will then be removed and burned). After that, the polluted water, the liquid form of sewage, will be pumped by the pump house. The pumping process is meant to transfer the polluted water from the settling tank to the sprinkler beds in which the purification phase occurs. After a while, the pumped polluted water reachs the top of the sprinkle beds, that pumped polluted water disperses when it meets the rotating arms. That dispersion produces jets of polluted water which head for the sprinkle beds’ layers that lay between two sides of thick brick work. Then, the jets of polluted water slowly infiltrate the layers, the layers act as filters which purify the polluted water from stones and microorganisms. The result of the purification is the purified water which will be flowed to the river as soon as it has been accumulated thoroughly.