Aquatic & Terrestrial Pollution
Which of the following terms describes the treated wastewater that is released back into the environment after sewage treatment?
Sludge
Effluent
Biosolids
Sediment
What is the primary goal of the primary stage of sewage treatment?
Biological breakdown of organic matter
Disinfection of pathogens
Physical separation of solids from liquids
Nutrient removal
Which of the following processes is primarily associated with the secondary stage of sewage treatment?
Using screens to remove large objects
Allowing heavy particles to settle in sedimentation tanks
Biological breakdown of organic matter by microorganisms
Filtration and disinfection using UV light
In which stage of sewage treatment is UV light most commonly used?
Primary Treatment
Secondary Treatment
Tertiary Treatment
Sludge Digestion
Which of the following sewage treatment methods would be MOST effective at removing dissolved organic pollutants?
Using a bar screen
Adding chlorine
Aerated lagoons
Sedimentation
Which of the following is a key reason for treating sewage?
To increase the temperature of the water
To reduce the spread of disease
To add pollutants to the water
To decrease water scarcity in all areas
How does sewage treatment contribute to environmental protection?
By increasing the amount of pollutants in water bodies
By preventing pollution of surface water, groundwater, and coastal areas
By promoting the spread of waterborne diseases
By decreasing the availability of water resources

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Which of the following is a potential trade-off of using advanced tertiary treatment methods compared to simpler primary treatment?
Lower cost but reduced pollutant removal
Lower energy consumption but less effective disinfection
Higher efficiency but increased risk of pathogen contamination
Reduced environmental impact but decreased water reuse potential
What are the two main components of a septic system?
Sedimentation tank and aeration basin
Septic tank and drainage field
Chlorination unit and UV disinfection system
Reverse osmosis membrane and activated carbon filter
What primarily happens to the solid waste (sludge) within a septic tank?
It is immediately discharged into a nearby stream
It is broken down by bacteria through anaerobic digestion
It is filtered and used for irrigation
It is converted into drinking water