There are three main processes to purified water before entering river in sewage disposal unit. At the first stage, settling tank, solids are settle from the dirty water, come from main sewer. It will be removed and burned. The output is polluted water. The polluted water goes into the second stage, pump house. It is in order to accelerate the water. Then it ready to begin the third stage, sprinkler beds. The polluted water is sprouted with jets to the filter. The rotating arm makes it to be speared evenly. Stone and micro-organism can’t pass by it. At the end, purified water that ready entering river, we get as the final result.
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