A water treatment plant has three identical horizontal shaftflocculation tanks. Each tank is composed of three stages with sizeof 4 m depth, 14.1 m length and 15 m width. G value of each stageis 40 s-1, 30 s-1 and 20 s-1. Mean water temperature is 15°C (μ =1.139×10-3). What are the power requirements for flocculationstages in a single flocculation tank. And Is the flocculation tankin an efficient way?
( Plant's average flow rate of 300,000 m3/d, Design criteria: G· t 104 ~ 105, Detention time 20~30 min )
