Environmental Engineering Booster Quiz-3

What is the concentration of H+ ions in moles/L in water if the pOH value is 5?

One litre of sewage, when allowed to settle for 30 minutes gives a sludge volume of 30 cm³. If the dry weight of this sludge is 6 grams, then its sludge volume index is:

Sludge bulking can be controlled by:

A mixed liquor with 2500 mg/l of suspended solids has the settled volume of 225 ml from a liter of this mixed liquor. Its sludge volume index is

What is the maximum permissible limit of fluoride in drinking water?

The following data pertain to a waste water sample

Initial Dissolved oxygen = 10 mg/l

Final Dissolved oxygen = 3 mg/l

Dilution = 2 %

The Biochemical oxygen demand of the given wastewater sample is:

An ideal settling basin is designed with the surface overflow rate (SOR) of 1m³/m²/hour. Particles have their discrete settling velocities and concentration as follows:

Which one of the following give the correct estimate of the overall removal of particles per hour?

Raw water is entering a treatment plant and contains 250 mg/l suspended solids. If 55% of these solids are removed in sedimentation then find the solids removed in sedimentation as sludge?

Biochemical oxygen demand is quoted at what temperature?