Sewage Disposal Unit

Sewage mostly contains potentially dangerous substances which can cause pollution if it is thrown away into the river directly without any purifying process. Sewage can lower the water quality in the river and create a hazard to public health. Therefore, sewage had to be processed in order to make the potentially dangerous substances less dangerous.

The process of purifying sewage is very simple to understand. There are three main places of treatment which hold three main process of purifying sewage, which are the settling tank, the pump house, and the sprinkler beds. In the first step, the sewage enters the settling tank through a main sewer. In the settling tank, after a several while, the undecayed solids will settle in the bottom of the settling tank, for then be removed and burned. The rest of the sewage will be absorbed into the pump house. From the pump house, the sewage will enter the sprinkler beds. There, the filtration process is hold. The sewage from the pump house will be sprayed by the rotation arm into the brick work which contains stones and microorganisms as the filter media. Rocks are one of the recommended media for sewage filtration because it do not fragment or soften on exposure to sewage. Microorganisms, in the other hand, adsorb nutrient from the sewage as food. Finally, after the process of filtration is finish, the purified water can enter the river.