NAME:SCORE:

DATE:

MULTIPLE CHOICE1. What treatment system uses Physical Processes to remove nonhomogenizable solids and homogenize the remaining effluent

2.

A.Tertiary TreatmentB.Secondary TreatmentC.Primary TreatmentD.None of the above

3. The primary design factor of sedimentation systems

A.BODB.TSSC.Overflow RateD.Hydraulic rate

4. Refers to heavier inorganic solids and includes sand, gravel, metal filings, and the like

A.Volatile SolidsB.IronC.GritD.Sludge

5. In activated sludge system, Food to Microorganism (F/M) ratio is equal to

A.BOD / SSB.SVIC.MCRTD.DO / SS

6. Sludge used for soil amendment or fertilizer is called

A.GritB.BiosolidsC.Solid wasteD.Mud press

7. In the design of aeration basin, the length depends on what factor

A.VelocityBDiffuser sizeCAeration TimeDMaterial of tank

8. One of the following causes upset conditions in the Activated Sludge process, EXCEPT

A.Short circuitingBScum formationCSufficient MLSSDExcessive Sludge

9. Aeration of water is done to remove

A.GritsBDissolved gasesCBODDAll of the above

10. Bacteria present in the wastewater system which are optimum within the temperature range of 50 52 C

11.

A.MesophilicBThermophilicCAerobicDAnaerobic

12. The total solids in water are due to the presence of

A.Suspended & DissolvedBSuspended & floatingCColloidal & SettleableDColloidal and bacterial cells

TRUE OR FALSE

1. Wastewater having BOD greater than 3,000 mg/L are ideally treated aerobically

2. Activated Sludge Process is an Anaerobic Treatment process

3. Aeration systems are independent of the temperature of the wastewater

4. Insufficient aeration can cause bulking of solids in Activated Sludge system

5. Sludge collected from sedimentation tanks before RAS are called Primary Sludge

6. Primary treatment of wastewater removes nutrients such as nitrogen and

phosphorus

7. Sedimentation is the process of retaining water in a basin so that the suspended particle may settle as a result of the action of gravity

8.

9. Particles with velocity greater than the overflow rate will settle

10. Diffusers are ideally located at the tank floor

11. Dissolved Oxygen (DO) in aeration tank decrease suddenly at the inlet and are usually mitigated through step aeration or tapered aeration systems

12.

Answer Key: MULTIPLE CHOICE: 1. C; 2. C; 3. C; 4. A; 5. B; 6. C; 7. C; 8. D; 9. B; 10. A TRUE OR FALSE: 1. F; 2. F; 3. F; 4. T; 5. T; 6. F; 7. T; 8. T; 9. F; 10. T