Question

QUESTION 2 Which phase of treatment removes materials that will clog or damage the piping system in a treatment plant? Pretreatment Primary Secondary Tertiary (Advanced)

Answer 1

2) A pretreatment process is the process which protect raw water lifting systems and protect piping system against clogging or blockage.

So, option (a) is correct.

5) According to the secrets of New York , the north river WWTP can treat approximately 170 millions of gallon of waste water per day.

So, option (c) 170 GPD is correct.