What is the size of the coarse screen used in pre-treatment of water?

What is TSCA compliance assistance?

Given list 1 and list 2, find which of the following pair is correctly matched?

The reduction of carbon dioxide by cascade aerators is in the range of

In a rectangular horizontal flow tank, the maximum permissible velocity(in m/Sec) is.

Which method of population forecast combines both arithmetical increase and geometrical increase method?

The Ca²⁺ concentration and mg²⁺ concentration of water sample are 160 mg/ litre and 40 mg/ litre as their ions respectively. The total hardness of the water sample in terms of CaCO₃ in mg/litre is approximately equal to________

A water contains the following dissolved ions.

[Na+]=56mg/L;[Ca2+]=40mg/L;

[Mg2+]=30mg/L;[Al3+]=3mg/L;

[HCO−3]=190mg/L;[Cl−]=165mg/L;

Water pH is 7.

Atomic weights:

Ca=40,Mg=24,Al=27,H=1,C=12,O=16,Na=23,Cl=35.5

The total hardness of the sample in mg/L as CaCO3 is

A town has an existing horizontal flow sedimentation tank with an overflow rate of 17 m3/day/m2, and it is desirable to remove particles that have a settling velocity of 0.1 mm/sec. Assuming the tank as an ideal sedimentation tank, the percentage of particles removal is approximately equal to

Consider a water treatment plant's primary sedimentation tank (PST) with a Surface Overflow Rate (SOR) of 40 m3/m2/d. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is ________µm.

Assume that Stoke's Law describes the settling velocity of the particles in water.

Given : Density of water =1000 kg/m3,

Density of particle = 2650 Kg/m3,g=9.81 m/s².

Kinematic viscosity of water (v)=1.10×10⁻⁶m²/s.