Wastewater Sludge Characteristics
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Questions and Answers

What is the purpose of concentration or thickening in sludge treatment?

  • To enhance the pathogen content of the sludge
  • To increase the organic matter content of the sludge
  • To separate mineral and organic solids in the sludge
  • To remove water from the sludge and reduce its volume for easier handling (correct)

    • What is the primary purpose of stabilization or digestion in sludge treatment?

  • To remove pathogens from the sludge
  • To decompose the organic part of the sludge by micro-organisms (correct)
  • To increase the heavy metal content of the sludge
  • To separate nitrogen and phosphorous from the sludge

    • What does sludge contain that makes it rich in nutrients?

  • Pathogens and heavy metals
  • Nitrogen and phosphorous (correct)
  • Hydrocarbons and industrial influence
  • Organic pollutants and pesticides

    • Which method is used to stabilize sludge by digesting it under aerobic or anaerobic conditions?

    <p>Aerobic Digestion</p> Signup and view all the answers

    What pollutants are most likely to get adsorbed to the sludge in wastewater treatment?

    <p>Heavy metals and organic pollutants</p> Signup and view all the answers

    What is the primary purpose of dewatering in sludge treatment?

    <p>To remove water from the sludge and reduce its volume</p> Signup and view all the answers

    What is the main objective of stabilization or digestion in sludge treatment?

    <p>To decompose the organic part of the sludge by micro-organisms</p> Signup and view all the answers

    What makes sludge rich in nutrients such as nitrogen and phosphorous?

    <p>Valuable organic matter it contains</p> Signup and view all the answers

    Which method is used to reduce the volume of sludge by removing water as much as possible?

    <p>Concentration or Thickening</p> Signup and view all the answers

    What happens during aerobic digestion in sludge treatment?

    <p>The organic part of the sludge is oxidized and decomposed by micro-organisms in the presence of oxygen</p> Signup and view all the answers

    Sludge consists of water and mineral solids only.

    <p>False</p> Signup and view all the answers

    Sludge can contain heavy metals and organic pollutants if the sewage contains industrial influence.

    <p>True</p> Signup and view all the answers

    Dewatering is the process of stabilizing the sludge by digesting it under anaerobic conditions.

    <p>False</p> Signup and view all the answers

    Aerobic digestion involves oxidizing and decomposing the organic part of the sludge in the absence of oxygen.

    <p>False</p> Signup and view all the answers

    The primary purpose of concentration or thickening is to increase the volume of the sludge for easier handling.

    <p>False</p> Signup and view all the answers

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