Sedimentation 1. For particles with a settling velocity, V2, less than Vo, the f

Question

Sedimentation 1. For particles with a settling velocity, V2, less than Vo, the fraction removed, R, is equal to what? For a settling basin, a weir is often used. However, for chemically coagulated water, a weir should be avoided for what reason? What should be used instead? 2. Flocculant particles of the same initial size and density as discrete particles will intercept the sludge zone in a shorter time. Why? The ideal settling basin theory gives the most rational approach to design and suggests which important design parameters? 4.

Explanation / Answer

(1) Answer:- R2 = V2/V0

(2) Answer:- Weirs produce considerable turbulance and should not be used for chemicaly coagulated water.

Conduits are used instead of weirs.

(3) Answer:- Discrete particles do not change their shape , size , specific gravity with time but floculating particles can change their shape ,size and specific gravity with time due to this reason flocculant particles intercept in shorter time.

(4) Answer:- Design parameters for ideal settling basin:-

(i) Depth of settling zone

(ii) Length of settling zone

(iii) Width of settling zone

(iv) Volume of settling zone

(v) Volumetric flow rate

(vi) Flow speed

(vii) Transit time

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