Biological Oxygen Demand

Secondary treatment uses __________ to consume wastes

• micro-organisms

• chemicals

• filtration

• none of these

Biochemical Oxygen Demand (BDO) is used to measure

• The air pollution

• The land pollution.

• The weather pollution

• The water pollution

Oxygen sag curves

• may occur during spring floods

• occur when oxygen demanding wastes are added to the water

• develop in fast flowing rivers

• May occur upstream from a sewage treatment plant

• ?

Tags

NGSS.MS-LS2-4

What does Biological Oxygen Demand (BOD) measure in water bodies?

• The amount of oxygen consumed by microorganisms

• The amount of oxygen produced by aquatic plants

• The amount of carbon dioxide in water

• The amount of nitrogen in water

Tags

NGSS.MS-LS2-3

Which of the following factors can increase the Biological Oxygen Demand in a water body?

• Increased levels of organic waste

• Decreased temperature

• Increased oxygen levels

• Decreased microbial activity

Why is Biological Oxygen Demand an important parameter in assessing water quality?

• It indicates the level of organic pollution

• It measures the pH level of water

• It determines the salinity of water

• It assesses the mineral content of water

What is the typical unit of measurement for Biological Oxygen Demand?

• Milligrams per liter (mg/L)

• Parts per million (ppm)

• Grams per cubic meter (g/m³)

• Kilograms per liter (kg/L)

How does high Biological Oxygen Demand affect aquatic life?

• It reduces the available oxygen for aquatic organisms

• It increases the growth of aquatic plants

• It stabilizes the water temperature

• It enhances the clarity of water

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which process is primarily responsible for reducing Biological Oxygen Demand in wastewater treatment?

• Aerobic digestion

• Chlorination

• Sedimentation

• Filtration

What is the relationship between Biological Oxygen Demand and dissolved oxygen levels in water?

• Higher BOD leads to lower dissolved oxygen

• Higher BOD leads to higher dissolved oxygen

• BOD does not affect dissolved oxygen

• BOD and dissolved oxygen are unrelated

Tags

NGSS.HS-LS1-7