UTA6 Sewage Treatment & Disposal

Question 1

What term is used to describe wastewater that contains dissolved oxygen?

Answer 1

Aerobic
OR
Fresh

Question 2

For proper storage, you should maintain the sample within what temperature range?

Answer 2

2°C to 10°C

Question 3

For a wastewater plant that discharges effluent to a body of water, what type of permit must be obtained from the EPA or designated state agency?

Answer 3

NPDES

Question 4

What is the minimum acceptable size of a septic tank, in gallons?

Answer 4

1,000

Question 5

A heavy input of storm water into a sewage treatment plant results in what type of hydraulic problems?

Answer 5

Hydraulic overloading

Question 6

Within a 24-hour period, the lowest flow in a sewage treatment system is between what hours?

Answer 6

0000 - 0500 hours

Question 7

What is the normal color of wastewater containing dissolved oxygen?

Answer 7

Gray

Question 8

Domestic sewage should have what noticeable odor?

Answer 8

Musty odor

Question 9

What term is used to describe suspended solids that neither settle of float in wastewater?

Answer 9

Colloidal particles

Question 10

Volatile solids either burn or evaporate within what temperature range?

Answer 10

500°C to 600°C

Question 11

The acid or base properties of a water solution is measured in _______.

Answer 11

pH

Question 12

What type of bacteria requires dissolved oxygen to remain alive?

Answer 12

Aerobic bacteria

Question 13

A grab sample normally covers what time span, in minutes?

Answer 13

15 minutes

Question 14

The flow proportional composite sample normally covers what time span, in hours?

Answer 14

24 hours

Question 15

Treatment plant influent water should be between what pH values?

Answer 15

6.5 to 8 pH

Question 16

An Imhoff cone should be used to perform which test?

Answer 16

Settleable solids test

Question 17

When performing the BOD5 test, you should read one sample immediately and store the other at 20°C for exactly how many days?

Answer 17

5 days

Question 18

Which test should be performed within 30 minutes of taking a sample?

Answer 18

Chlorine residual

Question 19

After a sample is chilled to 4°C, a fecal coliform test should be performed within how many hours?

Answer 19

6 hours

Question 20

What is the cheapest operating effluent discharge method?

Answer 20

Continuous discharge method

Question 21

What type of effluent discharge requires a place to store the effluent?

Answer 21

Intermittent

Question 22

Vegetation around evaporation and percolation basins should not be allowed to exceed what maximum height, in inches?

Answer 22

10 inches max

6 inches minimum

Question 23

Trees should not be allowed to grow within how many feet of wastewater lagoons?

Answer 23

500 feet

(150) meters

Question 24

When a septic tank discharges into a leaching field greater than 500 feet in length, you should incorporate what component(s) into the system?

Answer 24

Dosing tank and siphon

Question 25

Regardless of size, a septic tank should be inspected at what standard intervals, in months?

Answer 25

2 month intervals

Question 26

What is the minimum distance in feet that a shallow well can be located from a septic tank?

Answer 26

100 feet

Question 27

What is the minimum distance in feet that leaching cesspools can be located from each other?

Answer 27

20 feet

Question 28

What inch diameter size of perforated pipe is used in leaching fields?

Answer 28

4 inch pipe

Question 29

What is the maximum allowable length in feet of a leaching field lateral?

Answer 29

100 feet in length

Question 30

When a leaching field becomes inoperable, you must consider what option?

Answer 30

Replace it with a new system