Sewage Disposal by wahyu

The first stage of the sewage disposal system is the settling tank. Sewage water goes into the tank. Then, the undecayed solids that is contained in the sewage water will be sedimented in the bottom of the tank. By then, the sedimented materials can be removed out of the tank and further on burned. The remaining polluted water goes to the second stage of the sewage disposal system, which is the pump house.
The pump house pumps the polluter water into the third stage of the sewage disposal system, the sprinkler beds.
The sprinkler bed is the third stage of the sewage disposal system. Using the power of the pump, the polluted water is transported into the rotating arms. These rotating arms have sprinklers that showers jets of polluted water into the soil filter underneath. The filter is formed by stones and micro-organism, and is fenced by brick works, so as the polluted water does not seep sidewards. The polluted water then has nowhere else to go from the filter but downwards. On the bottom of the filter is the waterway of clean water. Having gone through the filter, the polluted water is now purified and no longer contains pollutants. Then, the waterway/pipe transfers this purified water into the river.