WorksheetsSmedes 8.11 Sewage Treatment Processes
Total questions: 1
Worksheet time: 18mins
1-15.
Answer the questions below after watching the video
What is the primary goal of sewage treatment as discussed in the video?
To create employment
To produce clean drinking water
To reduce nutrient pollution
To generate energy from waste
What does primary treatment remove from sewage?
Large solid materials
Dissolved gases
Microbes
Nutrients like nitrogen and phosphorus
What is the role of microbes in secondary sewage treatment?
To filter out inorganic materials
To disinfect the water
To add oxygen to the waste
To break down organic waste
What does secondary treatment primarily target for removal?
Primary sludge
Inorganic solids
Organic waste
Chemical reagents
What is the main purpose of adding oxygen in the aeration tank during secondary treatment?
To remove nitrogen
To cool down the sewage
To support microbial breakdown of waste
To filter out plastic and paper
What percentage of phosphorus is typically removed during secondary treatment?
90%
30%
50%
70%
Why is tertiary treatment not universally applied?
It is cost-prohibitive
It is not approved by environmental agencies
It removes too much water
It is too effective
Which of the following is not a focus of tertiary treatment?
Reducing nutrient pollution
Removing large debris
Removing phosphates
Removing nitrates
What is 'effluent' as defined in the video?
Solid waste removed during primary treatment
A type of chemical used in disinfection
Treated wastewater discharged from a plant
Untreated sewage
Which disinfectant might be used in the treatment process?
Ultraviolet light
Oxygen
Carbon dioxide
Sand
What is the purpose of the grit chamber in sewage treatment?
To allow inorganic materials to settle
To add chemicals to the sewage
To remove organic pollutants
To introduce oxygen into the system
What happens to sludge after it is collected in sewage treatment?
It is released back into rivers
It is recycled into drinking water
It is used to generate electricity
It is disposed of in landfills or used as fertilizer
What environmental issue can arise from combined sewage and stormwater systems?
Reduction in solid waste
Overproduction of clean water
Release of untreated sewage during heavy rain
Increased energy consumption
What is a major drawback of combined sewage and stormwater systems?
They increase the risk of chemical spills
They are less effective at removing organic pollutants
They can lead to untreated sewage discharge during heavy rains
They require constant electrical power
What are persistent organic pollutants?
Materials that are easily broken down by microbes
Chemicals that remain in the water even after treatment
Nutrients like nitrogen and phosphorus
Inorganic materials like sand and gravel
