A348-P12

Which of the following statement is about equalization basin?

• Equalization basins are used as a final stage in wastewater treatment plant

• The type of equalization basin is not dependent on the variability of the wastewater

• Equalization basins can prevent the toxic materials from entering the biological treatment plant

• Equalization basins incur additional cost in maintaining the downstream facilities

The following are sources of industrial wastewater, EXCEPT:

• Landfill

• Resident Building

• Factories Building

• Refinery Plant

Bacteria are beneficial to wastewater treatment because

• they naturally break down organic matter
• they help solid material to settle out of the wastewater
• the nutrients produced are beneficial to the treated water
• they aren't beneficial

Which of the following is required to be introduced into the aeration tank for the biological treatment?

• Oxygen

• Carbon Dioxide

• Heat

• Sunlight

Solids Retention Time (SRT) is ________

• The time taken to produce 10 kg of sludge in the aeration tank

• The time taken for the sludge to flow from the clarifier to the aeration tank

• The time taken for the sludge stays in the activated sludge system

• The time taken for the wastewater to flow in the activated sludge system

What causes SRT to increase?

• Increase of flow rate

• Increase of substrate concentration

• Increase of sludge flow rate

• Increase of return sludge flow rate

What is the bacteria provide to the algae in a facultative pond?

• CO2

• O2

• BOD

• COD

What is advantage for anaerobic pond?

• It can break down more complex organic matters

• It requires high operating costs

• It can reduce number of faecal coliform

• It needs oxygen for the operation

For the activated sludge process, how can the microorganisms reduce BOD in the wastewater?

• Aerobic respiration

• Photosynthesis

• Sedimentation

• Digestion

Activated sludge process uses ___________ to degrade organics from wastewater.

• Microorganisms

• Oxygen

• Carbon Dioxide

• Solid Catalyst