What is the Criteria for flocculation tank design?

In designing flocculation tanks, several factors should be considered. They are :

i. Flexibility which should include alternative flocculant aid application and the capabiluty to vary velocity gradient.

ii. To minimise short circuiting, a minimum of three compartments in series should be provided.

iii. Type of coagulants used

iv. Provosion of space for furture increase in the number of flocculation tanks when upgrading the treatment plant

v. A minimum of two tanks to be built in any treatment plant