How big is a flocculation tank?
These Flocculation Tank are available as 2 and 3 Stage Flocculation Tank with single or double wiers and mixer bridges. These flash mixer and flocculator or coagulation tank are available in sizes from 1m3 to 4m3 size.
What is the typical range of detention times for flocculation mixing design criteria?
Overall detention time in the flocculation process typically ranges from 10 to 30 minutes and is generally provided in several different basins or basin segments so the mixing intensity can be varied through the process.
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 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 G in flocculation?
With this rectilinear approach, the velocity gradient, G, is the. principal design parameter for flocculation units. A curvilinear approach, i.e., one that accounts for short-range effects in particle collisions, is presented as. a set of corrections to the rectilinear collision frequency functions for each.
What is a flocculation tank?
The flocculation tank has wooden paddle-type mixers that slowly rotate on a horizontal motor-driven shaft. After flocculation the water flows into the sedimentation tanks. Some small water-treatment plants combine coagulation and sedimentation in a single prefabricated steel unit called a solids-contact tank.
How do you calculate tank detention time?
The simplest way to calculate detention time is to divide the volume of the container by the flow rate into the container. The theoretical detention time of a container is the same as the amount of time it would take to fill the container if it were empty.
How long does flocculant need to circulate?
Circulate the Flocculant Run the pool pump for two hours to circulate the floc throughout the water. Remember to keep your filter set to “recirculate,” not “filter.”
How do you measure flocculation?
The most basic method of studying particle aggregation is by direct microscopic observation of particles. Simply counting the number of particles and aggregates in a defined volume of suspension over a sufficient time period can give direct information on aggregation rate.
What is G value in mixing?
Injectors. One of the most common methods of measuring mixing, particularly the mixing of flocculants or coagulants is the use of “G value”. This term originally proposed by Camp and Stein (1943) refers to the mechanical power required to facilitate turbulent mixing and is based on the velocity gradient.
What is a mixing G value?
How do you calculate overflow rate?
The overflow rate (also known as the surface loading or the surface overflow rate) is equal to the settling velocity of the smallest particle which the basin will remove. Surface loading is calculated by dividing the flow by the surface area of the tank. Overflow rate should usually be less than 1,000 gal/day-ft.
How do you vacuum a flocculant?
Our Pool Floc Hot Tips
- Floccing is best done in the evening: you can add the floc, run the pump for 2 hours, then leave it for 8 hours overnight and vacuum the next morning.
- Vacuum slowly!
- Usually while vacuuming to ‘Waste’, you can run the garden hose into the pool to keep the water level the same.
What is the basic principle of flocculation?
Flocculation refers to the process used to bring the coagulated particles together so that they can combine to form larger, settleable, and filterable masses of particles called floc. Zeta potential is defined and its role in coagulation described.
What is velocity gradient G?
The G (or GT) factor, indicative of power per unit volume, was developed in the 1940s as a means of determining dynamic mixer performance in stirred tanks.
What are the minimum and maximum flow through velocities in a flocculation basin?
Basin flow-through velocity should not be less than 0.5 ft/min or greater than 1.5 ft/min.
What are the design criteria for mechanical flocculator?
Design criteria for Mechanical flocculator are furnished below. Depth of the tank = 3 to 4.5m Total area of paddles = 10 to 25% of the vertical cross-sectional area of the tank In the conduit to transfer flocculated water to the sedimentation basin = 0.15 to 0.25 m/ min
What are the standards in Aguaclara flocculators?
Here are the current standards in AguaClara flocculators: – hLfloc = 40cm – GCSθ = 37, 000 The plant flow rate Q is defined by the needs of the community that the plant is being desiged for.
What is the difference between flocculator and sedimentation tanks?
Ordinarilly in AguaClara plants, the flocculator occupies the same length dimension as the sedimentation tanks, which is why the length constraint exists. See Fig. 113 for a representation of how the flocculator and sedimentation tanks are placed in a plant.
What is the best floc size for settling?
The floc will then settle out in the sedimentation basin, with remaining floc will be removed in the filter. The best floc size for settling is 0.1 to 3 mm. Larger floc does not settle as well and is more subject to breakup in the flocculation basin.