What is Velocity Gradient (G Value)?
A measure of mixing intensity in flocculation systems representing the root mean square velocity gradient in the fluid.
View Wastewater TreatmentVelocity Gradient (G Value) Explained
G (s-1) = sqrt(P / mu x V), where P is power (W), mu is dynamic viscosity (Pa.s) and V is tank volume (m3). For rapid coagulant mixing: G = 200-1000 s-1. For flocculation: G = 10-75 s-1. GT value for flocculation is typically 10,000-100,000.
Common Applications
- Flocculator design
- Rapid mix tank sizing
- Coagulation efficiency assessment
- Water treatment plant design
Selection Factors
Correct selection depends on the process objective and site conditions. For Velocity Gradient (G Value), Premix usually reviews these points before recommending equipment:
- Coagulant type and dose
- Particle size distribution
- Water temperature
- Treatment efficiency required
Why It Matters In Plant Operation
Velocity Gradient (G Value) affects process stability, chemical usage, equipment life and final output quality. A correctly selected solution helps reduce trial-and-error at site and supports more predictable daily operation.
Frequently Asked Questions
What is Velocity Gradient (G Value)?
A measure of mixing intensity in flocculation systems representing the root mean square velocity gradient in the fluid.
Where is Velocity Gradient (G Value) commonly used?
It is commonly used in Flocculator design, Rapid mix tank sizing, Coagulation efficiency assessment, Water treatment plant design.
How does Premix select Velocity Gradient (G Value)?
Premix reviews Coagulant type and dose, Particle size distribution, Water temperature, Treatment efficiency required along with the plant layout and maintenance requirement.