What is clariflocculation?
Clariflocculation is a chemical and physical water treatment method that primarily involves the removal of suspended matter.
Surface water treatment, industrial and municipal wastewater treatment, filter pre-treatment, and reverse osmosis are all used in the municipal and industrial sectors. Organic chemicals, sedimenting particles, and heavy metals may all be removed by clariflocculation.
The clariflocculation procedure is a tried-and-true method of treatment. The sedimentation-precipitation-coagulation-flocculation sequence is the most widely utilized method for producing drinkable water across the world. For large amounts of cleansed water, the method necessitates minimal costs. It is a dependable procedure that can be controlled automatically.
What are clariflocculators used for?
Clariflocculator is a combination of flocculation and clarification in a single unit. It has two concentric tanks where the inner tank serves as flocculation basin and outer tank as a clarifier. For primary and secondary settling of raw and effluent waters, clariflocculators are utilized. These are used to remove turbidity and settleable suspended particles. There are several varieties of clariflocculators and clarifiers to choose from, depending on the application and site requirements.
The units that make up a clariflocculator are-
i) Feeding apparatus;
ii) A mixing bowl or a mixing equipment;
iii) Flocculator or flocculation tank;
iv) Tank for settling or sedimentation;
The process involved in Clariflocculation
The water enters the Clariflocculators‘flocculator’, where the flocculating paddles aid in the flocculation of the feed particles. The liquid flows radially upward in the clarifier zone as heavier particles sink to the bottom. The cleared liquid is released into the peripheral wash through a peripheral weir. The sludge is scraped to the bottom at the central weir and channeled to the sludge chamber, where it is dumped.
What are the areas of application of Clariflocculators?
Municipal Water Treatment is an application area. Other areas of application include: ETP's primary treatment and Heavy Metal Elimination.
Design criteria forclariflocculators
The clariflocculator is a secondary treatment machine that may be used to treat both water and wastewater. In many treatment methods, a clarifier is the central component. Because a single unit covers a big area and up to 12 clariflocculators are utilized in a plant, the design must be both efficient and effective in order to justify the space. Because one unit accomplishes four processes, the design becomes much more crucial.
The flocculators design criterion
i) Tank depth should be 3 to 4.5 m;
ii) Detention time should range between 15 to 30 minutes;
iii) Flow velocity adopted is 0.2 to 0.8 m/s (usually 0.4 m/s);
iv) The total area of the paddle is equal to 10 to 25% of the tank's cross-sectional area, if the blade's peripheral velocity is between 0.2 and 0.6 m/s;
v)Blades should have a velocity of less than 0.1 m/s for optimal performance (in the event of floc sedimentation);
vi) The development of radially settling floc is prevented by a peripheral velocity which should be greater than 0.6 m/s;
vii) Scrapers should be able to pass through, if the paddle top is enough above the floor and below the water surface;
viii) The number of rotor paddles is usually 4;
ix) Usually the number of blades is kept equal to 3;
x) The velocity gradient ranges from 10 to 75 per second;
xi) Dimensionless factor G.T = 10x4 to 10x5;
How can Netsol Water help?
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