Wastewater Treatment Processes Quiz

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What factors tend to affect freshwater microbiota populations the most?

Plant and animal life

Temperature and pressure

Salinity and organic substances

Availability of oxygen and light (correct)

In rivers and streams, how is continuous oxygenation ensured?

By the depth of the water

By physical agitation of the water (correct)

Through photosynthetic algae

By the presence of planktonic Crenarchaeota

In marine ecosystems, what dominates microbial life below about 100 meters?

Archaea (correct)

Algae

Phytoplankton

Cyanobacteria

Which factors limit the growth of microorganisms in water?

Light energy, temperature, pressure Signup and view all the answers

What is typical of the deeper waters of freshwater bodies like the profundal and benthic zones?

Low oxygen concentrations and less light Signup and view all the answers

What is the basis of the oceanic food chain filling the upper 100 meters of the ocean?

Phytoplankton Signup and view all the answers

Which type of coliform bacteria can ferment lactose at 44.5°C?

Fecal coliforms Signup and view all the answers

What is the primary fecal coliform mentioned in the text?

E.coli Signup and view all the answers

Which type of bacteria produces spores resistant to environmental stresses and disinfection?

Clostridium perfringens Signup and view all the answers

Which group of bacteria live in human and animal guts and may help distinguish contamination sources?

Bifidobacteria Signup and view all the answers

What type of bacteria are commonly used to detect fecal contamination in water?

Fecal streptococci Signup and view all the answers

Which group of organisms has been proposed as indicator organisms alongside somatic coliphages?

Bacteriophages Signup and view all the answers

What is the role of aerobic microorganisms in the aeration tank?

Break down organic matter into CO2 and water Signup and view all the answers

How do trickling filters or biofilters work in wastewater treatment?

By oxidizing organic matter with aerobic microbes in a biofilm Signup and view all the answers

What is the primary function of a settling tank in wastewater treatment?

Settle out flocs to remove organic matter Signup and view all the answers

What is the main role of anaerobic sludge digesters in wastewater treatment?

Degrade organic solids into methane and CO2 Signup and view all the answers

What is the purpose of tertiary sewage treatment in the wastewater treatment process?

Remove essentially all the BOD, nitrogen, and phosphorus Signup and view all the answers

Why is it impractical to directly detect pathogens in water supplies?

Due to the cost and time-consuming procedures involved Signup and view all the answers

What is the role of MPN technique in water testing?

Estimate the number of coliform bacteria Signup and view all the answers

Why is gas formation in the Durham tube during the confirmed test significant?

Confirms the presence of total coliforms Signup and view all the answers

What does a positive presumptive test indicate?

Presence of acid and gas in the culture Signup and view all the answers

What are the characteristics of coliform colonies on Levine’s EMB agar?

Small colonies with dark centers Signup and view all the answers

What is the objective of wastewater treatment?

To reduce contaminants to acceptable levels Signup and view all the answers

What happens during the completed test in water testing procedures?

Streaking onto Levine’s EMB or LES Endo agar Signup and view all the answers

Why is the confirmed test necessary after the presumptive test?

To detect total coliforms Signup and view all the answers

How can carbon removal during wastewater treatment be measured?

Using BOD test Signup and view all the answers

What is one cause of red tides in marine environments?

Eutrophic blooms of marine dinoflagellates Signup and view all the answers

Which main source of pollution is NOT correctly matched with its type?

Agricultural pollution - Agricultural pollution Signup and view all the answers

Which test measures the amount of oxygen required by aerobic bacteria to fully metabolize organic wastes in water over a five-day period at 20°C?

Biochemical oxygen demand (BOD) test Signup and view all the answers

What does the total organic carbon (TOC) represent?

All carbon found in an organic compound Signup and view all the answers

Wastewater Treatment Processes Quiz

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Questions and Answers

What factors tend to affect freshwater microbiota populations the most?

In rivers and streams, how is continuous oxygenation ensured?

In marine ecosystems, what dominates microbial life below about 100 meters?

Which factors limit the growth of microorganisms in water?

What is typical of the deeper waters of freshwater bodies like the profundal and benthic zones?

What is the basis of the oceanic food chain filling the upper 100 meters of the ocean?

Which type of coliform bacteria can ferment lactose at 44.5°C?

What is the primary fecal coliform mentioned in the text?

Which type of bacteria produces spores resistant to environmental stresses and disinfection?

Which group of bacteria live in human and animal guts and may help distinguish contamination sources?

What type of bacteria are commonly used to detect fecal contamination in water?

Which group of organisms has been proposed as indicator organisms alongside somatic coliphages?

What is the role of aerobic microorganisms in the aeration tank?

How do trickling filters or biofilters work in wastewater treatment?

What is the primary function of a settling tank in wastewater treatment?

What is the main role of anaerobic sludge digesters in wastewater treatment?

What is the purpose of tertiary sewage treatment in the wastewater treatment process?

Why is it impractical to directly detect pathogens in water supplies?

What is the role of MPN technique in water testing?

Why is gas formation in the Durham tube during the confirmed test significant?

What does a positive presumptive test indicate?

What are the characteristics of coliform colonies on Levine’s EMB agar?

What is the objective of wastewater treatment?

What happens during the completed test in water testing procedures?

Why is the confirmed test necessary after the presumptive test?

How can carbon removal during wastewater treatment be measured?

What is one cause of red tides in marine environments?

Which main source of pollution is NOT correctly matched with its type?

Which test measures the amount of oxygen required by aerobic bacteria to fully metabolize organic wastes in water over a five-day period at 20°C?

What does the total organic carbon (TOC) represent?

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