Wastewater Treatment

Which substance is used in a sewage treatment system to kill harmful bacteria?

• ammonia

• chlorine

• sand

• soap

What is the purpose of using ultraviolet light on the water?

• To bleach it out
• To "sterilize" any bacteria 
• To remove chlorine
• To kill viruses

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-5

What is the role of bacteria in the water purification process?

• digest organic matter

• add chlorine
• nothing, we don't want them in there
• add nutrients to the sludge

Tags

NGSS.MS-LS2-3

What is the first step of preliminary wastewater treatment, which removes large items such as trash, plastic wrappers rags, and sticks?

• bar screens

• sedimentation

• aeration

• disinfection

The principle or main advantage of using constructed wetlands for wastewater treatment is:

• the resulting water exceeds all drinking water standards

• a natural ecosystem replaces industrial methods for advanced treatment and it is less expensive to build and maintain.

• it removes dioxin and other pollutants in the sediment of the wetland

• the method eliminates the production of methane, which contributes to global warming

Tags

NGSS.HS-ETS1-3

NGSS.HS-ESS3-4

The semi-solid organic material that comes out of a wastewater treatment plant after completion of the wastewater treatment process is called

• wastewater.

• pathogenic.

• sewage.

• sludge.

Which of the following are effective alternatives to chlorine for disinfecting wastewater in a conventional wastewater treatment plant?

• Freon or Ultraviolet light (UV light)

• Alcohol or Freon

• Phosphates or Nitrates

• Ozone or Ultraviolet light (UV light)

Tags

NGSS.HS-ETS1-3

NGSS.HS-ESS3-4

In sewage treatment, the purpose of bubbling oxygen into the aeration tank is to

• react chemically with nitrates and phosphates.

• keep the fish alive.

• keep decomposing bacteria alive.

• improve the odor.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

The best way to dispose of sludge, if toxins have been removed, is

• dry it for use as fertilizer.

• bury it in local landfills.

• dry it and make it into bricks for houses.

• dump it in the ocean.

What is a container, typically underground, in which sewage is collected and allowed to decompose through bacterial activity before draining by means of a leaching field called? (Many rural yards have these.....)

• treated sewage chamber

• septic tanks

• fecal reservoir

• dirty water vessel