What will happen if the mixing is rapid in the flocculation tank?

Rapid mixing brings the reactants together and homogenizes the solution. In the rapid stirring process, it will cause nucleation and precipitation of magnesium hydroxide. The magnesium hydroxide coagulation process had two stages including fast floc formation and growth of flocs.

What is the purpose of rapid mixing in jar test?

Rapid mixing of the water and coagulant is important to ensure thorough and even distribution of the coagu- lant. Flocculation is a slow gentle mixing of the water to encourage the flocs to forn and grow to a size which will easily settle out. This mixing is often done in a chamber or a series of chambers.

How do you speed up flocculation?

Water Treatment 101: 6 Tips for Improving Coagulation, Flocculation and Clarification

1. Use the correct polymer or coagulating chemicals.
2. Keep injection point close.
3. Slow mixing is good mixing.
4. Velocity gradient is important.
5. Keep an eye on temperature.
6. Balance the velocity.

What is the relationship between flocculation and coagulation?

Coagulation: Particles that aggregate with themselves e.g. by the influence of a change in pH. Flocculation: Particles that aggregate by the use of polymers that binds them together.

What is the design of a rapid mixing unit?

DESIGN OF RAPID MIXING (COAGULATION) UNITS Rapid mixing unit: provide complete mixing of the coagulant and rawwater. Destabilization of colloidal particle Earlystages of flocformation → Hydraulic mixing units (see Chp .6 ) occurin rapidmixingunit → Mechanically mixing units(seeChp.6) DesignCriteria: G for rapid mix 700-1000 sec-1

How long does coagulation take in a rapid mix chamber?

Over-mixing does not affect coagulation, but insufficient mixing will leave this step incomplete. Contact time in the rapid-mix chamber is typically 1 to 3 minutes. Coagulation and Flocculation Process Fundamentals 2 FLOCCULATION

How to design a flocculator for a treatment plant?

Design a horizontal flow baffled channel flocculatorfor a treatment plant of 10000m3/day capacity. The flocculation basin is to be divided into 3 sections of equal volume, each section having constant velocity gradients of 50, 35, 25 s-1, respectively. The total flocculation time is to be 21 min and the water temperature is 15 °C.

How is rapid mixing used in water treatment?

Little is understood about the critical role of rapid-mixing in water treatment. In this study, a photometric dispersion analyzer (PDA) was employed to monitor clay coagulation by alum and polymeric aluminum chloride (PACl). The effect of rapid-mixing time on particle removal was studied.

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