As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?

Related Mcqs:

Residual chlorine in water is determined by________________?

A. starch iodide method B. orthotolidine method C. both (A) and (B) D. none of the above...

The design discharge for the separate sewer system shall be taken as_____________?

A. equal to dry weather flow (DWF) B. 2xDWF C. 3 x DWF D. 6xDWF...

The detention period for oxidation ponds is usually kept as______________?

A. 4-8 hours B. 24 hours C. 10 to 15 days D. 3 months...

Which of the following compounds is widely used for algae control ?

A. sodium sulphate B. copper sulphate C. sodium chloride D. calcium chloride...

The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?

A. arithmetical increase method B. geometrical increase method C. incremental increase method D. graphical method...