Question

1. which of these ph readings indicates a base wastewater?

a. 3
b. 5
c. 6
d. 10

1. \schedule 40\ refers to pipe

a. flow capacity
b. frication loss
c. tubing strength
d. wall thickness

1. hydrogen peroxide controls odors by

a. decreasing the do
b. neutralizing the ph
c. oxidizing sulfide compounds
d. providing a source of hydrogen ions

1. the record log of a hydraulic cleaning operation should include

a. feet of rod used
b. camera malfunction
c. location of dropped joints
d. type and amount of material removed from downstream manhole

1. what should be considered when providing trench shoring?

a. cost - to - benefit ratio
b. depth of trench
c. pipe material
d. grade of sewer

1. biological activity in long, sluggish - flow, flat - grade sewer lines will likely

a. increase the carrying capacity of the line
b. stop toxic gas production
c. decrease line sediment
d. create oxygen deficiency in the air in manholes, sewers, or wet wells

1. a ph of 6.0 is

a. acid
b. alkaline
c. neutral
d. basic

Explanation:

7.

A pH value of 7 is neutral. Values less than 7 are acidic, and values greater than 7 are basic (alkaline). Among the options, 10 is greater than 7.

"Schedule 40" is a standard that refers to the strength of the tubing (pipe). It is related to the pressure - handling capacity which is a measure of strength.

Hydrogen peroxide (\(H_2O_2\)) can oxidize sulfide compounds (\(S^{2 -}\)) which are often responsible for odors. For example, in the reaction \(H_2O_2+S^{2 -}\to S + H_2O\) (simplified form), it oxidizes the sulfide.

Answer:

d. 10

8.