Quiz 2 (Wastewater Characteristics)

Which one is the characteristic of wastewater?

• Does not contain pathogenic micro-organisms

• Safe to health

• Used water from residential, commercial, and industrial areas

• Free from breeding sites for insects, pests and micro organism

Which of the following wastewater flowrates is important in the design facilities involving retention time?

• Minimum hourly flow

• Peak hourly flow

• Average daily flow

• Maximum daily flow

Which of the following sources is NOT categorized as domestic wastewater?

• Manufacturing factories

• Residential houses

• Schools

• Toilet and bathroom

Which of the following is NOT considered as physical characteristic of wastewater?

• Temperature

• Organic compound

• Odor

• Solids

Which ONE of the following is property of organic compound?

• Non combustible

• Low molecular weight

• High melting and boiling points

• Less soluble in water

What is the effect of excessive organic compounds in water?

• Maintain the population of aquatic life

• Increase the level of dissolved oxygen (DO)

• Damage the ecosystem

• Not a cause to health hazard

'Easily degraded by microorganisms' is a characteristic of?

• Non-biodegradable organics

• Biodegradable organics

• Inorganic compunds

Which of the following is NOT including in the measurement of organic compounds in water?

• Chemical oxygen demand

• Biochemical oxygen demand

• Biological oxygen demand

• pH

Definition of BOD

• Quantity of chemical utilized by micro-organisms to biologically degrade the organic matter in the water under anaerobic condition

• Quantity of oxygen utilized by micro-organisms to biologically degrade the organic matter in the water under aerobic condition

In the biological process, how much new cells will be produced from the organic matter?

• 1/4

• 2/3

• 1/2

• 1/5