Wastewater Treatment Processes Quiz
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Questions and Answers

What is the main purpose of the aeration tank in a wastewater treatment plant?

  • To settle out flocs
  • To remove pathogens
  • To oxidize sewage organic matter into CO2 and water (correct)
  • To trap nitrogen and phosphorus
  • Which treatment process is responsible for transferring flocs to a settling tank for removal of organic matter?

  • Trickling filters
  • Secondary treatment
  • Sludge digestion
  • Primary treatment (correct)
  • What type of microorganisms are present in trickling filters or biofilters?

  • Pathogens
  • Methane-producing bacteria
  • Anaerobic bacteria
  • Aerobic microbes (correct)
  • Which treatment process is specifically designed to remove essentially all the BOD, nitrogen, and phosphorus from wastewater?

    <p>Tertiary treatment</p> Signup and view all the answers

    What is the main byproduct generated by anaerobic sludge digesters in wastewater treatment?

    <p>Methane and CO2</p> Signup and view all the answers

    Which treatment method involves cleaner water trickling through pipes at the bottom of the filter for additional treatment?

    <p>Trickling filters</p> Signup and view all the answers

    What is the primary purpose of primary treatment in wastewater treatment?

    <p>To separate solid and particulate materials from wastewater using physical methods</p> Signup and view all the answers

    Which stage of treatment is designed to remove most of the organic matter and reduce the BOD by up to 95%?

    <p>Secondary treatment</p> Signup and view all the answers

    What is the main function of activated sludge systems in wastewater treatment?

    <p>To promote the biodegradation of organic impurities</p> Signup and view all the answers

    How does trickling filters differ from activated sludge systems in secondary treatment?

    <p>Trickling filters use physical separation methods while activated sludge uses biological processes</p> Signup and view all the answers

    In which stage of wastewater treatment are aeration and settling tanks typically utilized?

    <p>Secondary treatment</p> Signup and view all the answers

    What is the major difference between primary and secondary treatments in wastewater treatment?

    <p>Primary treatment focuses on reducing pathogens while secondary treatment focuses on reducing BOD</p> Signup and view all the answers

    What is the primary objective of wastewater treatment?

    <p>To reduce or eliminate contaminants to acceptable levels</p> Signup and view all the answers

    Which of the following is NOT considered a main source of water pollution according to the text?

    <p>Oil spills</p> Signup and view all the answers

    How is the total organic carbon (TOC) different from biologically usable carbon measured by the BOD test?

    <p>TOC specifies all carbon regardless of usability</p> Signup and view all the answers

    Which parameter is used to measure the amount of oxygen required by aerobic bacteria for biodegradation over a five-day period at 20°C?

    <p>Biochemical oxygen demand (BOD)</p> Signup and view all the answers

    Which wastewater treatment process involves the use of microorganisms in an aerated tank to break down organic matter?

    <p>Activated sludge system</p> Signup and view all the answers

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