Sewage Disposal Unit is an easy way to waste the sewage, but not to pollute the river. This unit consists of settling tank, pump house, and sprinkler beds. First, polluted water flows through main sewer to settling tank. Here, sewage is stayed for a while to separate solids material from liquid through settling. When all of the undecayed solids are settled in the bottom of the tank, it has to be taken and then be removed and burned. Meanwhile, the liquid or polluted water is kept flow to the pump house. This house pumps polluted water to the sprinkler beds. Next in sprinkler beds, this water flows up through T-shaped pipe. Then the horizontal part of this pipe is rotated and it sprays jets of this water into a filter. This filter made of stones and microorganisms, so it can make water less polluted by removing organic material in the polluted water. The last step is purified water flows through pipe into a river.
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