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Reactor Clarifier
Reactor clarifier is the most economical solution for precipitation and clarification requirements. The unit combines mixing, coagulation, flocculation, solids recirculation, sedimentation and sludge removal in a single unit.
Operating Principle
The Reactor Clarifier unit consists of three distinct zones. The feed enters the primary reaction or mixing zone where a slow speed impeller is used to create a suction to draw previously precipitated solids to mix with the feed. The mixing zone has a high volume internal recirculation designed to promote particle growth and improve the removal of suspended solids. The mixing zone can also be used to dose coagulant if necessary.
The overflow from the mixing zone then enters to the secondary reaction or flocculation zone. The barrier between the clarification zone and flocculation zone is generally circular or conical in shape. Flocculent dosing can be carried out in this zone. This zone is designed is to have sufficient retention time to promote floc formation.
The effluent / water then enters the clarification zone by passing down and radially outward from the flocculation zone. The large area under the edge of the cone creates a low velocity zone. The upward velocity of the water maintains a zone of suspended, reached slurry. This acts as a filter and catalyst, collecting small particles of sludge. Due to the solid recirculation, the settling process in the clarification zone is enhanced owing to a higher suspended particle density in the clarification zone. The treated effluent / water is collected in radial launders provided at the top to the clarification zone. Radial launders increase the weir loading area substantially thereby contributing to he compact size of the reactor clarifier.
Settled sludge is scraped from the bottom of the tank, by means of a scraper arrangement provided, towards a sludge collection arrangement present at the centre of the tank
Applications
Typical applications are in removal of turbidity, color and metals, water and wastewater treatment and many others, which involve removing suspended solids form feed stream.
Size Range
Voltas has the capability to design and engineer reactor clarifiers ranging from 10M diameter to 50M diameter.
Material of Construction (Under Water Parts)
Mild Steel Epoxy Coated / Galvanized / FRP Coated / Stainless Steel 304 / Stainless Steel 316
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