Purpose of Wastewater Treatment
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Questions and Answers

What is the maximum allowable concentration of chromium in water?

  • 0.005 mg/L
  • 0.05 mg/L (correct)
  • 0.010 mg/L
  • 0.019 mg/L

    • What is the pH range within which wastewater should ideally fall to be considered safe for aquatic life?

  • 4 to 7
  • 0 to 6
  • 6.5 to 8.5 (correct)
  • 7 to 14

    • What is the purpose of retention ponds in the context of water temperature management?

  • To aerate the water
  • To increase water temperature
  • To decrease dissolved oxygen content
  • To cool the water (correct)

    • What does BOD stand for in the context of water quality assessment?

    <p>Biochemical Oxygen Demand</p> Signup and view all the answers

    Which organization focuses on recommending a common level of environmental quality across Canada without legislative authority?

    <p>Canadian Council of Ministers of the Environment</p> Signup and view all the answers

    What happens to the oxygen levels in water if BOD and COD rates are too high?

    <p>They decrease</p> Signup and view all the answers

    What are the consequences of pushing the pH level of the receiving water beyond safe limits?

    <p>Affecting aquatic life adversely</p> Signup and view all the answers

    Which of the following chemicals has a maximum allowable concentration of 0.010 mg/L in water?

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

    What is the impact of high temperature water being dumped into receiving water?

    <p>Increase in oxygen demand</p> Signup and view all the answers

    What role does the Canadian Environmental Protection Act play in regulating water quality in Canada?

    <p>Applies only to federal government operations</p> Signup and view all the answers

    What is the primary purpose of wastewater treatment?

    <p>To remove contaminants and disinfect wastewater before discharge</p> Signup and view all the answers

    Which of the following is not a typical waste liquid found in industries and plants in Canada?

    <p>Drinking water</p> Signup and view all the answers

    Which parameter is not mentioned as a factor affecting the quality of water?

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

    What does the term 'toxicity' refer to in the context of wastewater treatment?

    <p>Presence of harmful chemicals in water above certain concentrations</p> Signup and view all the answers

    Which of the following is an example of a typical agricultural waste liquid?

    <p>Agricultural pesticides</p> Signup and view all the answers

    Why is it important to control parameters such as acidity and toxicity in wastewater?

    <p>To ensure the water meets environmental discharge standards</p> Signup and view all the answers

    What is the duty of the Canadian Council of Ministers of the Environment (CCME) regarding environmental quality in Canada?

    <p>Recommending a common level of environmental quality</p> Signup and view all the answers

    How does high temperature water affect the dissolved oxygen levels?

    <p>Reduces dissolved oxygen levels</p> Signup and view all the answers

    Which temperature range should water be cooled to before safely discharging into a stream or lake?

    <p>As close as possible to the water temperature in the retention pond</p> Signup and view all the answers

    What is the role of the Canadian Environmental Protection Act in relation to water quality regulations in Canada?

    <p>It applies only to federal government operations, federal lands, and aboriginal lands</p> Signup and view all the answers

    What impact can high BOD and COD rates have on water?

    <p>Reduced oxygen levels</p> Signup and view all the answers

    What is the main consequence of wastewater ability to push the pH level of receiving water beyond safe limits?

    <p>Possibility of making water unfit for use</p> Signup and view all the answers

    What is the purpose of a retention pond in the context of managing water quality?

    <p>Allow wastewater to cool down before discharge</p> Signup and view all the answers

    Why should the pH of wastewater ideally fall between 6.5 and 8.5?

    <p>To avoid adverse effects on aquatic life</p> Signup and view all the answers

    What is the primary role of cooling towers in managing wastewater temperature?

    <p>To cool the water using air exposure</p> Signup and view all the answers

    What is the measurement for the rate at which microorganisms consume oxygen in water when decomposing organic waste?

    <p>Biochemical Oxygen Demand (BOD)</p> Signup and view all the answers

    What is the main goal of wastewater treatment?

    <p>To remove and properly dispose of contaminants from water</p> Signup and view all the answers

    How does toxicity affect water quality?

    <p>By causing adverse effects on human health and well-being</p> Signup and view all the answers

    Why is it necessary to control the temperature of water before discharge?

    <p>To ensure it falls within certain parameters for environmental safety</p> Signup and view all the answers

    What role does disinfection play in wastewater treatment?

    <p>Killing harmful microorganisms before discharge</p> Signup and view all the answers

    Which of the following is NOT one of the waste liquids commonly found in industries and plants in Canada?

    <p>Rainwater from precipitation</p> Signup and view all the answers

    Why must the contaminants in water be removed or reduced before discharging into the environment?

    <p>To protect human life and aquatic environments from adverse effects</p> Signup and view all the answers

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