Biological Processes for Industrial and Domestic Effluents
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Questions and Answers

What is the main purpose of biological wastewater treatment?

  • To remove contaminants after primary treatment (correct)
  • To increase pollution incidents
  • To discharge untreated wastewater
  • To generate more wastewater

    • Which of the following is NOT mentioned as a source of wastewater in the text?

  • Industrial activities
  • Commercial activities (correct)
  • Agricultural activities
  • Military activities

    • What types of microorganisms are used in biological wastewater treatment?

  • Insects, mammals, reptiles
  • Bacteria, nematodes, algae (correct)
  • Protozoa, rotifers, fungi
  • Viruses, arthropods, annelids

    • Why is accidental spillage mentioned as a concern in the text?

    <p>To demonstrate potential consequences of pollutants getting into the environment</p> Signup and view all the answers

    What does biological treatment help transform dissolved materials into?

    <p><strong>Stable inorganic forms</strong></p> Signup and view all the answers

    How are biological treatments classified based on the text?

    <p><strong>Based on process</strong></p> Signup and view all the answers

    What is the main difference between biological aerobic treatment and biological anaerobic treatment?

    <p>Presence of oxygen in aerobic treatment and absence of oxygen in anaerobic treatment</p> Signup and view all the answers

    Which type of treatment yields a cleaner water effluent, resulting in high-quality effluent production?

    <p>Biological aerobic treatment</p> Signup and view all the answers

    What is the key feature of the activated sludge process mentioned in the text?

    <p>Highly concentrated microorganisms to degrade organics</p> Signup and view all the answers

    Why is biological aerobic treatment considered a rapid and efficient waste treatment process?

    <p>Due to the presence of oxygen</p> Signup and view all the answers

    Which microorganisms are primarily responsible for utilizing organic matter in biological wastewater treatment?

    <p>Bacteria, algae, and fungi</p> Signup and view all the answers

    What is the reason behind the activated sludge process being widely used in the secondary stage of wastewater treatment?

    <p>Efficient degradation of organics and nutrient removal</p> Signup and view all the answers

    What is the main purpose of aeration in the activated sludge process?

    <p>To promote the growth of microorganisms that degrade organic matter</p> Signup and view all the answers

    What is the purpose of the settling tank in the activated sludge process?

    <p>To separate the microbial mass (sludge) from the treated wastewater</p> Signup and view all the answers

    What is the purpose of trickling filters in wastewater treatment?

    <p>To remove compounds like ammonia from the wastewater after primary treatment</p> Signup and view all the answers

    What is the function of the biological film or slime layer in trickling filters?

    <p>To provide a surface for microorganisms to attach and degrade organic material</p> Signup and view all the answers

    What is the purpose of aeration in aerated lagoons?

    <p>To introduce oxygen into the lagoon to promote biological oxidation of the wastewater</p> Signup and view all the answers

    Which of the following is NOT a type of aerobic wastewater treatment method discussed in the text?

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

    What is the primary purpose of oxidation ponds?

    <p>To facilitate the interaction between sunlight, bacteria, algae and other organisms to break down organic matter</p> Signup and view all the answers

    What is a disadvantage of oxidation ponds?

    <p>They require a large area of land</p> Signup and view all the answers

    Which statement is true about biological anaerobic treatment?

    <p>It is used to treat high-strength wastewater before discharge to a municipal sewer system</p> Signup and view all the answers

    What is a characteristic of anaerobic digestion?

    <p>It is used for sludge degradation and stabilization in wastewater treatment plants</p> Signup and view all the answers

    What is a benefit of anaerobic treatment?

    <p>It is able to stabilize the water with little biomass production</p> Signup and view all the answers

    Which statement is true about the effluent from aerated ponds?

    <p>It may be reused or used for recharge</p> Signup and view all the answers

    What is the role of methanogenic archaea populations in anaerobic wastewater treatments?

    <p>Enforce anaerobic conditions</p> Signup and view all the answers

    How deep should an anaerobic lagoon typically be for more efficiency?

    <p>Deeper than 2.5 m</p> Signup and view all the answers

    What distinguishes anaerobic lagoons from aerobic lagoons?

    <p>Presence of dissolved oxygen</p> Signup and view all the answers

    What fills an anaerobic filter for wastewater treatment?

    <p>Plastic media</p> Signup and view all the answers

    In which direction does the flow occur in an anaerobic filter filled with rocks?

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

    Why are deeper anaerobic lagoons considered more efficient in wastewater treatment?

    <p>To allow anaerobic conditions to prevail</p> Signup and view all the answers

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