Existing settlers are either rectilinear or radial types. A radial settler can be used for low flow rates, and the number of them can be increased to handle higher rates. They remove the suspensates at the same time as providing clarification, i.e.. they operate continuously, but the clarification in one does not exceed 50-60%. A rectilinear settler is designed for period hydraulic elimination of the sludge if there is an adequate difference in level between the settler and the sludge discharge. If there is no such facility, it may be built directly on the ground without reinforcement of the bottom and the sides for the purpose of removing the deposited suspensates. which in the main are eliminated by a floating collector. A rectilinear settler with hydraulic sludge removal is designed with a reinforced floor and multisection walls in order to clarify the water in an ongoing fashion while the sludge is being washed out in one section. To eliminate the sludge in such a settler may require a considerable amount of water. The clarification in such a settler does not exceed 40-50%.
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