Wastewater Treatment and Ecology Quiz
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Questions and Answers

What negative effect does oxygen depletion have on ecosystems?

  • Improved waste treatment
  • Enhanced environmental health
  • Increased biodiversity
  • Reduced biodiversity (correct)

    • What is considered the most valuable method for wastewater treatment?

  • Chemical treatment methods
  • Mechanical filtration
  • Biological wastewater treatment methods (correct)
  • Thermal treatment techniques

    • What were the initial concerns regarding waste handling in ancient Greece primarily based on?

  • Waste segregation
  • Health impacts
  • Aesthetics and odors (correct)
  • Resource recovery

    • What are the two primary sources of wastewater?

    <p>Domestic and industrial wastewater</p> Signup and view all the answers

    Which of the following was not recognized until the mid-1800s regarding waste?

    <p>Links between wastes and human health</p> Signup and view all the answers

    How have perceptions of waste treatment changed over time?

    <p>They have increasingly focused on health and environmental impacts.</p> Signup and view all the answers

    What is a potential consequence of pollution on water bodies?

    <p>Environmental health decline</p> Signup and view all the answers

    Which of the following treatment types is NOT mentioned as a common approach to wastewater management?

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

    What are the main benefits of using new nitrogen-cycle bacteria?

    <p>Improved nitrogen removal</p> Signup and view all the answers

    What is the focus of the Sharon process?

    <p>Nitrogen removal from ammonium-rich wastewater</p> Signup and view all the answers

    Which of the following processes is designed for biological nutrient removal without chemicals?

    <p>The Barnard process</p> Signup and view all the answers

    Which bacteria are critical for anaerobic ammonium oxidation?

    <p>Anammox bacteria</p> Signup and view all the answers

    What was the focus of the research conducted by Jetten et al. in 2001?

    <p>Microbiology and biochemistry of anammox</p> Signup and view all the answers

    What aspect of wastewater treatment was addressed by Mino et al. in their 1998 study?

    <p>Enhancing biological phosphate removal</p> Signup and view all the answers

    What is a common characteristic of UASB reactors in wastewater treatment?

    <p>Granulation of anaerobic bacteria</p> Signup and view all the answers

    What is one of the significant contributions of the research by Punal and Lema?

    <p>Application in anaerobic treatment of fish-canning wastewater</p> Signup and view all the answers

    What is a principal advantage of biological phosphorus removal compared to chemical precipitation?

    <p>Reduced chemical costs</p> Signup and view all the answers

    Which type of bacteria is known for its high capacity to accumulate polyphosphate?

    <p>Acinetobacter calcoaceticus</p> Signup and view all the answers

    Which organism is NOT mentioned as a biological phosphorus removal bacteria?

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

    What is one of the focuses of the Workshop on Sustainable Municipal Wastewater Treatment Systems?

    <p>Reducing sludge production</p> Signup and view all the answers

    Which of the following is NOT a type of bacteria used in biological phosphorus removal?

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

    What type of reactor is typically associated with anaerobic wastewater treatment?

    <p>Upflow anaerobic sludge blanket (UASB) reactor</p> Signup and view all the answers

    What is a common outcome of using biological systems for phosphorus removal?

    <p>Lower chemical dependency</p> Signup and view all the answers

    Which publication focuses on the microbiology of anaerobic digesters?

    <p>The Microbiology of Anaerobic Digesters</p> Signup and view all the answers

    What is a major drawback of the Upflow Anaerobic Sludge Blanket (UASB) system?

    <p>It necessitates high hydraulic retention time.</p> Signup and view all the answers

    What range of temperature is considered mesophilic for gas production?

    <p>30°C to 40°C</p> Signup and view all the answers

    What is a potential consequence of high organic loading rates in anaerobic reactors?

    <p>Acid accumulation.</p> Signup and view all the answers

    What factor does NOT influence the retention time in anaerobic reactors?

    <p>Color of the wastewater.</p> Signup and view all the answers

    Which of the following toxicants can lead to failures in anaerobic digesters?

    <p>Aromatic hydrocarbons.</p> Signup and view all the answers

    In the context of nitrate production, which microorganisms are involved in nitrite oxidation?

    <p>Nitrobacter and Nitrospira.</p> Signup and view all the answers

    What is the second stage of the nitrogen removal process?

    <p>Denitrification.</p> Signup and view all the answers

    Which condition is crucial for the optimal function of anaerobic digesters?

    <p>Absence of toxicants.</p> Signup and view all the answers

    What does the F/M ratio represent in wastewater treatment systems?

    <p>The ratio of food available to microorganisms</p> Signup and view all the answers

    Which variable in the F/M formula directly depends on wastewater influent characteristics?

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

    In the equation F/M = (QSo)/X, what does 'X' denote?

    <p>The concentration of MLVSS</p> Signup and view all the answers

    What is the primary factor influencing the modulation of MLVSS in activated sludge processes?

    <p>Control of return activated sludge rate</p> Signup and view all the answers

    What is the main reason for including post-biological disinfection steps in wastewater treatment plants?

    <p>To eliminate viruses and pathogenic bacteria</p> Signup and view all the answers

    Attached growth processes like trickling filters mainly work by which method for substrate removal?

    <p>Mass transport limitation</p> Signup and view all the answers

    Which microorganism type is NOT typically associated with activated sludge?

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

    The targeted F/M ratio changes according to what factor?

    <p>The design of the system</p> Signup and view all the answers

    What compounds are reduced to nitrogen gas by denitrifiers?

    <p>NO2– and NO3–</p> Signup and view all the answers

    Which metals stimulate the growth of microbes in denitrification systems?

    <p>Nickel, cobalt, and molybdenum</p> Signup and view all the answers

    What is the effect of volatile fatty acids (VFA) on microbial growth?

    <p>They inhibit growth of several microbial species</p> Signup and view all the answers

    At what concentration does 50% inhibition of acetoclastic methanogenesis occur for acetate?

    <p>13,000 mg/L</p> Signup and view all the answers

    Which process is advantageous because it requires no extra carbon addition?

    <p>Partial nitrification combined with Anammox</p> Signup and view all the answers

    What effect does sulfide have on acetoclastic methanogens?

    <p>It inhibits more than other microbial groups</p> Signup and view all the answers

    What problem do lipids in wastewater cause during hydrolysis?

    <p>Formation of long-chain fatty acids</p> Signup and view all the answers

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

    <p>Ammonium oxidation to nitrite</p> Signup and view all the answers

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