Rotating bridge scrapers are used in settling tank at the middle and large scaled waste water treatment system. The Settling tank purpose is precipitate of the biological or chemical sludge and acquire clarified water in the processed biological or chemical waste water. Settling sludge has to remove from the system in the clarification process. There is a need to make sludge extraction at the certain points because of the sludge forming a wide cover on the bottom of tank. Therefore scrapers are used. Rotating bridge scrapers are suitable for use at the circular settling tank.  Sludge on the bottom of the tank directed towards the sludge receiving chambers through the scraper pallet which in the bottom of the tank. Also, foam and oil accumulated on the surface of the settling tank directed towards oil and foam collecting chambers through the scraper pallet which in the top of the tank.

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