Linear scrapers are used in rectangular settling tank at the middle and large scaled waste water treatment system. Sludge, sand and the like on the bottom of the tank directed towards the sludge receiving chambers through scraper pallet the linearly stripping from 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. The bridge drive can be made of concrete or by means of moving wheels on the rail.

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