Sewage is needed to be disposed and purified. It is because every house produces sewage. If the sewage is not disposed and purified, it will accumulate. The accumulated sewage will make a problem. One of the problems is pollution of environment. Sewage is disposed and purified through three main parts; they are settling tank, pump house, and sprinkler beds.
First part is settling tank. In this part, sewage comes through the main sewer. All of the sewage is collected in the tank. The sewage will settle in this tank. The undecayed solids will get onto the base of the tank. And then, it will be removed and burned. This part produces polluted water.
The second part is pump house. Like its name, in this part, polluted water is pumped. The pump house is only used to force the water so it can go to the sprinkler beds.
The last part is sprinkler beds. In this part, the polluted water goes through a pipe. It is channeled to the rotating arms. The water will be scattered to the filter by the jets of polluted water. This filter will filtrate all of the stone and microorganism. After passing through this filter, the polluted water has become clean water. From this, the water can be channeled to the river.