Table of Contents
What is a flocculation basin?
The flocculation basin often has a number of compartments with decreasing mixing speeds as the water advances through the basin. This compartmentalized chamber allows increasingly larger floes to form without being broken apart by the mixing blades.
What is GT value in flocculation?
The value of Gt would be in the range from 20 000 to 200 000. The values of G and t depend on the raw water quality (e.g. colour, turbidity, algae), water temperature and the required floc size (inversely proportional to G).
What is flocculation and explain their design?
Flocculation, a gentle mixing stage, increases the particle size from submicroscopic microfloc to visible suspended particles. Microfloc particles collide, causing them to bond to produce larger, visible flocs called pinflocs.
What is the meaning of a Clariflocculator?
Clariflocculator is a combination of flocculation and clarification in a single tank. It has two concentric tanks where inner tank serves as a flocculation basin and the outer tank serves as a clarifier.
What is flocculation and why is it used in water treatment?
Flocculation is a water treatment process where solids form larger clusters, or flocs, to be removed from water. This process can happen spontaneously, or with the help of chemical agents. It is a common method of stormwater treatment, wastewater treatment, and in the purification of drinking water.
What happens in the aeration basin?
In the aeration basin, the biomass consumes both oxygen and the organic pollution resulting in the net growth of microorganisms and the release of carbon dioxide.
What are clarifiers used for?
Clarifiers are settling tanks built with mechanical means for continuous removal of solids being deposited by sedimentation. A clarifier is generally used to remove solid particulates or suspended solids from liquid for clarification and (or) thickening.
What is flocculation with example?
Flocculation is the collection of cells into aggregates by the addition of multivalent cations, metal salts or polymers (for example, polyaluminum chloride).
What is the purpose of coagulation and flocculation in water treatment?
Coagulation and flocculation remove a large number of organic compounds as well as suspended particles, including inorganic precipitates. The process removes particles and dissolved matter; however, the water may still contain pathogens, including viruses and bacteria.
Why are flocculants needed?
Used in a wide range of industries and applications, flocculants help to remove suspended solids from wastewater by aggregating contaminants into flakes or “flocs” that float to the surface of the water or settle at the bottom. They can also be used for lime softening, sludge thickening, and solids dehydration.
How do clarifiers work?
The clarifier works by permitting the heavier and larger particles to settle to the bottom of the clarifier. The particles then form a bottom layer of sludge requiring regular removal and disposal. Clarified water then proceeds through several more steps before being sent for storage and use.
What is flocculation process?
Flocculation is a process by which a chemical coagulant added to the water acts to facilitate bonding between particles, creating larger aggregates which are easier to separate. The method is widely used in water treatment plants and can also be applied to sample processing for monitoring applications.
What is the flow rate of a flocculation basin?
Example: The flow to a flocculation basin 50 feet long, 12 feet wide, and 10 feet deep is 2,100 gpm. What is the detention time in the tank (in minutes)? Tank Volume, gal = Length, ft x Width, ft x Depth, ft x 7.48 gal/ft 3
How do you calculate detention time in a flocculation basin?
The flow to a flocculation basin 50 feet long, 12 feet wide, and 10 feet deep is 2,100 gpm. What is the detention time in the tank (in minutes)? Tank Volume, gal = Length, ft x Width, ft x Depth, ft x 7.48 gal/ft 3 Now, let’s convert the flow from MGD to gpm so we can determine detention time in the following example:
Why was flocculation incomplete at the inlet of the settling basin?
the basin inlet. In the case of the plant having poor facilities, flocculation was so incomplete at the inlet of the settling basin that it proceeded for a long time after the water entered the basin, so 1262 H. E. HUDSON JR. & J. P.
Why do we use several compartments in a hydrological basin?
Use of several compartments helps to as- sure ample detention time for flocculation. reasonably uniform work input for a wide range of flows. This is done by designing a substantial head loss into the basin, so that depth of flow in- creases with quantity of flow. In many