1. Jar tests should be followed by on-site tests for more accurate results.
a. true
b. false

2. Lime stabilization results in a greater volume or mass of sludge
a. true
b. false

3. Foaming in aerobic digesters is a common problem that is easily corrected by reducing the dissolved oxygen level in the digester.
a. true
b. false

4. The most important concern in diffused air thickening is sludge age.
a. true
b. false

5. A 12-inch pipe flowing half full will carry twice as much flow as a 6-inch pipe flowing half full, if at the same slope.
a. true
b. false

Answers:

1. a
2. a
3. a
4. b
5. b