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- +61 490 843 030
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Conventional Clarifiers
Wock-Oliver’s clarifiers provide a size and type to fit any plant requirement. The application-oriented design assures an economical performance for municipal or industrial water and wastewater treatment. Sedimentation tanks or conventional gravity clarifiers are used in water and wastewater treatment as a physical unit operation through gravity for solid-liquid separation of readily settleable solids. The functions can be further enhanced using a solid contact clarifier which combines mixing, flocculation, and clarification in a single tank.
Conventional circular clarifiers are commonly used in municipal wastewater treatment in order to reduce BOD and suspended solids content from the wastewater prior to the main biological treatment. Typically, a well designed primary clarifier should be able to remove up to 30% of the BOD from municipal wastewater with an HRT of 30 min and a BOD concentration of 200-300 mg/L. Secondary clarification is the final process for generating a good quality effluent in numerous activated sludge processes. An adequate surface loading rate is commonly used in order to determine the clarifier area.
Circular gravity clarifiers typically have a radial flow inlet pipe that feeds into a stilling well which reduces the influent velocity and redirects it downward in order to generate a uniform flow and prevent short circuiting. A central-driven dual arm sludge collector mechanism rotates continuously over a gently slopped bottom in order to collect sludge which later falls by gravity into a steep sludge hopper. The effluent overflows through adjustable v-notched weir plates. An optional scum baffle prevents scum from flowing into the effluent channel. A skimmer mechanism can be provided for scum removal.