A discharge of 86400 m3/day water is applied to a sedimentation tank with a surface area of 2000 m2. If the water contains 10 % of particles with a settling velocity of 0.1 mm/sec, 60 % particles with a settling velocity of 0.2 mm/sec, and 30 particles with a settling velocity of 0.6 mm/sec. Based on the above data choose the correct statements out of the following:
1
The surface overflow rate for the sedimentation tank is 0.5 m/sec
2
The overall efficiency of suspended solids removal for this tank is 62%
3
The surface overflow rate for this sedimentation tank is 0.5 mm/sec
4
The overall efficiency of suspended solids removal for this tank is 56%