The objective of clarification is to remove suspended mineral and organic matter from sewage after the wastewater has been subjected to passing through screening and grit removal. The lighter organic sewage solids,
which settle in the sedimentation tanks, are termed as sludge, while the sewage that has been partially clarified by the settling out of the solids is known as the effluent.
PRIMARY AND SECONDARY CLARIFIERS
S.A.M.E. WATER offers flexibility of design and can accommodate the client’s specifications. Generally for waste water treatment plants, the rotating bridge and scraper system extends to 50% of the diameter of the tank, however 75% and full length diameter bridges and scraper systems are also produced. A full range of sludge scraper systems is available. These include the echelon formation system for primary clarifiers, C-formation or Spiral scrapers are employed in secondary clarifiers. For sludge thickeners straight scrapers set at 30 degrees or echelon formation.
Scum removal systems can be supplied for all clarifiers, scum baffle brackets are designed for vertical and horizontal adjustment to fix the scum baffles in a true circle allowing tolerances in the civil structure. The V-notch weirs are laser-cut for accuracy and installed with a non-permeable sealer strip to ensure a good seal against the launder.
SUCTION LIFT CLARIFIERS
Clarifiers with sludge suction devices are generally used when the treatment of sewage is by activated sludge and where it becomes necessary to reduce sludge retention time in the final tank to avoid degradation. The sludge suction device is fitted to the clarifier where the speed of the scraper cannot be increased as it is fixed by the rotating bridge.
With adjustment of the water flow, the amount of sludge in each suction pipe can be controlled by valves in each pipe.
GRAVITY THICKENERS
Flocculation involves the process of the coalescence of particles of metal hydroxide and colloidal matter on contact. This process is effected by slow stirring of the liquid.
The stirring operation is designed to bring into contact water to be treated, the reagent and the sludge and be sufficiently slow so as not to destroy the floc or to reconstitute a colloidal suspension.
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