Application-oriented circular and solid-contact clarifiers for economical solid–liquid separation in municipal and industrial plants.
CWG’s clarifiers come in a size and type to fit any plant requirement. The application-oriented design assures economical performance for municipal or industrial water and wastewater treatment. Sedimentation tanks (conventional gravity clarifiers) are used as a physical unit operation, using gravity for the solid–liquid separation of readily settleable solids. The function can be enhanced with a solid-contact clarifier that combines mixing, flocculation and clarification in a single tank.
Conventional circular clarifiers are commonly used in municipal wastewater treatment to reduce BOD and suspended-solids content prior to the main biological treatment. A well-designed primary clarifier can remove up to 30% of the BOD with an HRT of about 30 minutes. Secondary clarification is the final process for generating good-quality effluent in activated-sludge processes, with an adequate surface loading rate used to determine the clarifier area.
Circular gravity clarifiers typically have a radial-flow inlet pipe feeding a stilling well, which reduces influent velocity and redirects it downward to generate uniform flow and prevent short-circuiting. A central-driven dual-arm sludge collector rotates continuously over a gently sloped bottom to collect sludge, which falls by gravity into a steep hopper. The effluent overflows through adjustable V-notched weir plates, while an optional scum baffle and skimmer keep scum out of the effluent channel.
Share your flow and solids and CWG will size the right clarifier for your plant.
