1. Possible techniques for controlling filamentous organisms in an activated sludge process include _.
a. dosage of return sludge with oxidants such as hydrogen peroxide or chlorine
b. lower D.O. levels in aeration basins so filamentous organisms cannot breath
c. lower F/M level to starve filamentous organisms
d. reduce nutrients essential for filamentous organisms
e. stop wasting to allow activated sludge organisms to gain control

2. How does breakpoint chlorination remove ammonia?
a. by breaking down the ammonia
b. by oxidizing the ammonia-nitrogen to nitrogen gas
c. by producing alkaline conditions
d. by removing the nitrifying bacteria
e. by using up the oxygen

3. pH is the measurement of _.
a. hydrogen ion concentration
b. conductivity
c. hydrogen ion concentration
d. equivalency

4. Cryogenic production of oxygen involves _.
a. compressing and cooling air to liquify all gases and filtering to remove particles
b. compressing and cooling air, removing water, and passing the air through a molecular sieve that absorbs nitrogen gas and other impurities
c. step a, plus compressing to separate the nitrogen gas from oxygen
d. induction of magnetic coils to create a cold field

5. A pig is a _.
a. farm animal
b. pointed brass probe used to lan out pipes
c. a rubber like plug used to clean out pipes

Answers:

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