Water Pollution and Eutrophication Quiz
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Questions and Answers

What is the main cause of eutrophication as mentioned in the text?

  • Excessive plant growth
  • Toxic chemicals in water
  • Sewage water discharge
  • Nitrogen and phosphorus (correct)

    • Why does eutrophication occur faster when nutrients are contributed by anthropogenic sources?

  • Increased water temperature
  • Presence of detergents in water
  • Accelerates the eutrophication cycle (correct)
  • Decreased oxygen levels

    • How does fertilization impact water quality according to the text?

  • Improves water clarity
  • Reduces nutrient levels in water
  • Raises bacteria concentration to hazardous levels (correct)
  • Decreases bacterial growth

    • What does the term 'eutrophic' mean based on its etymology as described in the text?

    <p>'Well fed or nutrient rich'</p> Signup and view all the answers

    How can eutrophication be controlled, according to the text?

    <p>Encourage effective disposal of sludge</p> Signup and view all the answers

    What contributes to polluting water by mixing toxic substances with the water supply?

    <p>Cultivating land</p> Signup and view all the answers

    What is the term used to describe the attached biomass responsible for metabolizing organic matter in sewage?

    <p>Biological film</p> Signup and view all the answers

    What happens to microorganisms in the lower portion of the slime layer when the microbial population increases significantly?

    <p>Slough off from the media surface</p> Signup and view all the answers

    Which component of an activated sludge treatment process accelerates the removal of biological oxygen demand (BOD)?

    <p>Sludge recirculation system</p> Signup and view all the answers

    What is the main function of the aerobic bacteria present in the biological film in a sewage treatment system?

    <p>Oxidize organic matter in sewage</p> Signup and view all the answers

    What characterizes the endogenous phase of growth for microorganisms in a sewage treatment system?

    <p>Detachment from media surface</p> Signup and view all the answers

    In an activated sludge treatment process, what is the purpose of the secondary sedimentation tank?

    <p>Recycle biological floc to aeration tank</p> Signup and view all the answers

    What is turbidity in water samples caused by?

    <p>Sand, silt, mud, chemical precipitates, germs, and bacteria</p> Signup and view all the answers

    What does alkalinity in water help determine?

    <p>Amount of acid that can be neutralized</p> Signup and view all the answers

    Why is dissolved oxygen important in lakes and rivers?

    <p>For supporting aquatic life</p> Signup and view all the answers

    What damage can turbidity cause to water pipes and valves?

    <p>Blockage and impairment</p> Signup and view all the answers

    Which ions are primarily responsible for alkalinity in water?

    <p>OH-, HCO3 -, CO3 -2</p> Signup and view all the answers

    How is turbidity in water samples determined?

    <p>Using a turbidity meter</p> Signup and view all the answers

    What is the principal purpose of sludge digestion in wastewater treatment?

    <p>Removing pathogens</p> Signup and view all the answers

    Which substances are employed as disinfectants for removing pathogens in sewage treatment?

    <p>Bleaching powder</p> Signup and view all the answers

    What gases are produced during the sludge digestion process?

    <p>Hydrogen sulphide and ammonia</p> Signup and view all the answers

    What type of tank is a septic tank useful for in wastewater treatment?

    <p>Sedimentation and digestion</p> Signup and view all the answers

    Which process leads to the death of microbes when disinfectants are used in sewage treatment?

    <p>Deactivating metabolic activities</p> Signup and view all the answers

    What is the main goal of using chlorine in sewage treatment?

    <p>Deactivating microbial metabolic activities</p> Signup and view all the answers

    What is the purpose of the gas vent in an Imhoff tank?

    <p>To prevent gases from escaping during the sewage treatment process</p> Signup and view all the answers

    What distinguishes an Oxidation Ditch from other treatment methods mentioned?

    <p>It involves introducing raw sewage directly into aeration units</p> Signup and view all the answers

    In an Imhoff tank, what happens in the sedimentation chamber?

    <p>Solids from the sewage settle down</p> Signup and view all the answers

    What is the primary role of the rotor in an Oxidation Ditch?

    <p>Agitation and oxygenation of the sewage</p> Signup and view all the answers

    How do Oxidation Ponds primarily stabilize organic matter?

    <p>Through the symbiotic relationship between bacteria and algae</p> Signup and view all the answers

    What distinguishes an Imhoff Tank from a Septic Tank?

    <p>It has two chambers - a sedimentation and a digestion chamber</p> Signup and view all the answers

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