4BE3 U6 C1 Obj 2 EMH
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EASY What is the primary source of boiler feedwater?

  • Municipal potable water
  • Pretreated well water
  • Deionized water
  • Untreated surface water (correct)

    • Why is it important to know the local water chemistry?

  • To understand what conditions require treatment (correct)
  • To determine the water's turbidity
  • To determine the pH level of the water
  • To determine the cost of equipment

    • Where can local water quality reports be found?

  • At the local library
  • With the local water treatment plant
  • At the town hall
  • Online through the local water utility (correct)

    • What is the primary purpose of municipal potable water systems?

    <p>To provide safe drinking water</p> Signup and view all the answers

    What is the main reason for removing solids from water?

    <p>To remove pathogens</p> Signup and view all the answers

    What is the primary concern with high turbidity in water?

    <p>It interferes with disinfection efforts</p> Signup and view all the answers

    Why is chlorine added to water?

    <p>To disinfect the water</p> Signup and view all the answers

    Why must chlorine addition be carefully controlled?

    <p>Because it can be carcinogenic</p> Signup and view all the answers

    What is the primary source of municipal water in the Vancouver area?

    <p>Rain and surface run-off</p> Signup and view all the answers

    What is the purpose of adding sodium hydroxide (NaOH) to municipal water for boiler use?

    <p>To neutralize the water's acidity</p> Signup and view all the answers

    What is the first step in a typical municipal water treatment process?

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

    What is the purpose of the clarification step in municipal water treatment?

    <p>To remove small particles</p> Signup and view all the answers

    Why is it necessary to remove oxygen from municipal water used in boilers?

    <p>To prevent corrosion</p> Signup and view all the answers

    What is the purpose of adding lime to municipal water?

    <p>To adjust the pH levels</p> Signup and view all the answers

    What is the purpose of using activated carbon filters in municipal water treatment?

    <p>To remove soluble organic constituents that affect taste and odour</p> Signup and view all the answers

    Why is it necessary to remove residual chlorine from municipal water used in boilers?

    <p>To prevent corrosion</p> Signup and view all the answers

    What is the purpose of using degasifier towers in boiler feedwater treatment?

    <p>To remove residual chlorine</p> Signup and view all the answers

    What is the potential health benefit of using ultraviolet (UV) light or ozone for disinfection in municipal water treatment?

    <p>Creating fewer health issues over time</p> Signup and view all the answers

    What is the limit of silica in industrial fire tube boilers according to ASME guidelines?

    <p>&lt; 150 ppm SiO2</p> Signup and view all the answers

    Why is disinfection using chlorine not necessary in boiler feedwater treatment from non-municipal source water?

    <p>Because ultraviolet or ozone systems are sufficient for disinfection</p> Signup and view all the answers

    What is the purpose of a settling pond in boiler feedwater treatment from non-municipal source water?

    <p>To remove suspended solids</p> Signup and view all the answers

    What is the problem associated with high alkalinity in boiler water?

    <p>Embrittlement, foam, and carryover</p> Signup and view all the answers

    What is the purpose of neutralization in external water treatment?

    <p>To prevent corrosion and scale formation</p> Signup and view all the answers

    What is the purpose of demineralization in external water treatment?

    <p>To reduce the level of chlorides</p> Signup and view all the answers

    What is the minimum level of dissolved oxygen that can be achieved through external water treatment?

    <p>10 ppb</p> Signup and view all the answers

    What is the purpose of anion exchange in external water treatment?

    <p>To remove silica</p> Signup and view all the answers

    MEDIUM What is the maximum recommended silica level in industrial fire tube boilers according to ASME guidelines?

    <p>150 ppm SiO2</p> Signup and view all the answers

    What is the typical purpose of adding compounds like alum, clay, and polymers in boiler feedwater treatment?

    <p>To remove suspended solids</p> Signup and view all the answers

    What is the primary method used to remove dissolved oxygen from boiler feedwater?

    <p>Chemical addition</p> Signup and view all the answers

    Which of the following issues is associated with high levels of chloride in boiler water?

    <p>Solids creation and increased corrosion</p> Signup and view all the answers

    What is the purpose of using UV or ozone systems in boiler feedwater treatment?

    <p>To disinfect the water</p> Signup and view all the answers

    What is the typical retention time in a settling pond used in boiler feedwater treatment?

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

    Which of the following processes is used to remove hardness from boiler feedwater?

    <p>Lime-soda softening</p> Signup and view all the answers

    What is the typical purpose of anion exchange in external water treatment?

    <p>To remove dissolved solids</p> Signup and view all the answers

    Why is municipal water not suitable for boiler use?

    <p>It is too acidic</p> Signup and view all the answers

    What is the purpose of clarification in municipal water treatment?

    <p>To remove suspended particles</p> Signup and view all the answers

    What is the potential problem associated with high levels of silica in boiler water?

    <p>Depositions and scaling</p> Signup and view all the answers

    Why is it necessary to remove oxygen from municipal water used in boilers?

    <p>To prevent corrosion</p> Signup and view all the answers

    What is the purpose of adding sodium hydroxide (NaOH) to municipal water for boiler use?

    <p>To neutralize acidity</p> Signup and view all the answers

    Why is it necessary to remove residual chlorine from municipal water used in boilers?

    <p>To prevent corrosion</p> Signup and view all the answers

    What is the purpose of filtration in municipal water treatment?

    <p>To remove suspended particles</p> Signup and view all the answers

    What is the concern with high levels of iron (Fe) in boiler water?

    <p>Corrosion and pitting</p> Signup and view all the answers

    What is the purpose of using activated carbon filters in municipal water treatment?

    <p>To remove organic constituents that affect taste and odour</p> Signup and view all the answers

    What is the purpose of disinfection in municipal water treatment?

    <p>To prevent contamination during transit</p> Signup and view all the answers

    What is the primary advantage of using municipal water as a source of boiler feedwater?

    <p>It has already undergone some treatment</p> Signup and view all the answers

    What is the primary goal of municipal potable water systems?

    <p>To provide safe drinking water that is aesthetically acceptable</p> Signup and view all the answers

    What is the primary concern with high turbidity in water?

    <p>It interferes with disinfection efforts</p> Signup and view all the answers

    What is the primary purpose of removing pathogens from municipal water?

    <p>To prevent biological impurities from forming during transportation</p> Signup and view all the answers

    What is the primary concern with dissolved oxygen in boiler feedwater?

    <p>It creates problems for the boiler operator</p> Signup and view all the answers

    Why is it necessary to test municipal water for a range of chemicals and bacteria?

    <p>To meet the target requirements of jurisdictional regulation</p> Signup and view all the answers

    What is the primary advantage of using municipal water quality reports?

    <p>They provide information on local water chemistry</p> Signup and view all the answers

    What is the primary purpose of disinfecting municipal water?

    <p>To prevent biological impurities from forming during transportation</p> Signup and view all the answers

    HARD What is the primary concern with high turbidity in boiler feedwater?

    <p>Interferes with disinfection efforts</p> Signup and view all the answers

    What is the primary reason for adding chlorine to municipal water?

    <p>To disinfect the water</p> Signup and view all the answers

    Why is it necessary to remove dissolved gases, dissolved solids, and hardness from municipal water for boiler use?

    <p>To remove impurities that can cause problems in the boiler</p> Signup and view all the answers

    What is the primary advantage of using municipal water as a source of boiler feedwater?

    <p>It is already quite clean</p> Signup and view all the answers

    What is the primary goal of municipal potable water systems?

    <p>To provide safe drinking water that is also aesthetically acceptable</p> Signup and view all the answers

    What is the primary purpose of removing solids from municipal water?

    <p>To remove dissolved solids</p> Signup and view all the answers

    Why is it necessary to test municipal water for a range of chemicals and bacteria?

    <p>To ensure the water is safe for drinking and meets jurisdictional regulation</p> Signup and view all the answers

    What is the primary concern with dissolved oxygen in boiler feedwater?

    <p>It creates problems for the boiler operator</p> Signup and view all the answers

    What is the primary purpose of using lime and lime-soda softening in boiler feedwater treatment?

    <p>To remove hardness</p> Signup and view all the answers

    What is the primary concern associated with high levels of silica in boiler water?

    <p>Deposit formation</p> Signup and view all the answers

    What is the purpose of using anion exchange in external water treatment?

    <p>To remove silica</p> Signup and view all the answers

    What is the primary purpose of using coagulation in boiler feedwater treatment?

    <p>To remove suspended solids</p> Signup and view all the answers

    What is the primary concern associated with high levels of chloride in boiler water?

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

    What is the purpose of using demineralization in external water treatment?

    <p>To remove dissolved solids</p> Signup and view all the answers

    What is the primary advantage of using UV or ozone systems in boiler feedwater treatment?

    <p>To disinfect biologically active water</p> Signup and view all the answers

    What is the primary purpose of using clarification in boiler feedwater treatment?

    <p>To remove suspended solids</p> Signup and view all the answers

    What is the primary purpose of adding sodium hydroxide (NaOH) to municipal water for boiler use?

    <p>To reduce acidity and prevent corrosion</p> Signup and view all the answers

    What is the primary concern with high levels of silica in boiler water?

    <p>It causes deposits and scales to form</p> Signup and view all the answers

    What is the primary purpose of clarification in municipal water treatment?

    <p>To remove suspended particles and organic matter</p> Signup and view all the answers

    What is the primary purpose of using activated carbon filters in municipal water treatment?

    <p>To remove organic contaminants and improve taste and odor</p> Signup and view all the answers

    What is the primary concern with high levels of iron (Fe) in boiler water?

    <p>It causes deposits and scales to form</p> Signup and view all the answers

    What is the primary purpose of disinfection in municipal water treatment?

    <p>To kill pathogens and microorganisms</p> Signup and view all the answers

    What is the primary concern with high turbidity in water?

    <p>It interferes with the disinfection process</p> Signup and view all the answers

    What is the primary advantage of using municipal water as a source of boiler feedwater?

    <p>It is a more consistent and reliable source</p> Signup and view all the answers

    What is the primary purpose of filtration in municipal water treatment?

    <p>To remove suspended particles and organic matter</p> Signup and view all the answers

    Why is it necessary to remove residual chlorine from municipal water used in boilers?

    <p>Because it can cause corrosion and damage to the boiler</p> Signup and view all the answers

    Study Notes

    Boiler Feedwater Sources

    • Boiler feedwater can be sourced from both untreated (surface and well water) and pretreated locations.
    • Local water chemistry is important to understand to determine what conditions need to be treated and how to size equipment.

    Municipal Water Treatment

    • Municipal potable water systems use three main steps to purify water:
      • Remove solids
      • Remove pathogens
      • Disinfect
    • The goal is to provide safe drinking water that is aesthetically acceptable.
    • Municipalities must meet target requirements of jurisdictional regulation.
    • Table 1 shows some of the most relevant parameters, including:
      • pH
      • Turbidity
      • Free chlorine
      • Total dissolved solids
      • Hardness
    • Municipal water is already treated, but still requires further treatment for dissolved gases, dissolved solids, and hardness.

    Municipal Water Treatment Process

    • The typical process involves:
      • Removing solids through screens and clarification
      • Removing remaining small particles through filtration
      • Disinfecting with chlorine, UV light, or ozone
    • The collected particles are further processed to recover available water and then sent to a landfill.

    Boiler Feedwater Treatment (Municipal Source Water)

    • When using municipal water as feedstock, it requires further processing to:
      • Reduce hardness
      • Remove oxygen and other dissolved gases
      • Adjust the pH
    • Care must be taken to minimize the amounts of iron, copper, and silica in the water.
    • Tables 2 and 3 show recommended ASME guidelines for boiler water quality.

    Boiler Feedwater Treatment (Non-Municipal Source Water)

    • For non-municipal sources, pre-treatment is essential before the water goes to the boiler house.
    • The first two stages of the process (clarification and filtration) are still required.
    • Disinfection using chlorine is not necessary, and ultraviolet or ozone systems can be used instead.
    • If the water has significant suspended solids, a settling pond can be used initially to remove most of the solids.

    Common Problems with Boiler Water

    • Table 4 shows some of the common potential problems with boiler water, including:
      • Acidity (low pH)
      • Alkalinity
      • Chloride
      • Dissolved oxygen and carbon dioxide
      • Hydrocarbons
      • Hardness (Ca and Mg ions)
      • Iron and copper
      • Silica
      • Suspended solids
      • Dissolved solids
    • Possible preventative solutions are listed for each problem.

    Boiler Feedwater Sources

    • Boiler feedwater can be sourced from both untreated (surface and well water) and pretreated locations.
    • Local water chemistry is important to understand to determine what conditions need to be treated and how to size equipment.

    Municipal Water Treatment

    • Municipal potable water systems use three main steps to purify water:
      • Remove solids
      • Remove pathogens
      • Disinfect
    • The goal is to provide safe drinking water that is aesthetically acceptable.
    • Municipalities must meet target requirements of jurisdictional regulation.
    • Table 1 shows some of the most relevant parameters, including:
      • pH
      • Turbidity
      • Free chlorine
      • Total dissolved solids
      • Hardness
    • Municipal water is already treated, but still requires further treatment for dissolved gases, dissolved solids, and hardness.

    Municipal Water Treatment Process

    • The typical process involves:
      • Removing solids through screens and clarification
      • Removing remaining small particles through filtration
      • Disinfecting with chlorine, UV light, or ozone
    • The collected particles are further processed to recover available water and then sent to a landfill.

    Boiler Feedwater Treatment (Municipal Source Water)

    • When using municipal water as feedstock, it requires further processing to:
      • Reduce hardness
      • Remove oxygen and other dissolved gases
      • Adjust the pH
    • Care must be taken to minimize the amounts of iron, copper, and silica in the water.
    • Tables 2 and 3 show recommended ASME guidelines for boiler water quality.

    Boiler Feedwater Treatment (Non-Municipal Source Water)

    • For non-municipal sources, pre-treatment is essential before the water goes to the boiler house.
    • The first two stages of the process (clarification and filtration) are still required.
    • Disinfection using chlorine is not necessary, and ultraviolet or ozone systems can be used instead.
    • If the water has significant suspended solids, a settling pond can be used initially to remove most of the solids.

    Common Problems with Boiler Water

    • Table 4 shows some of the common potential problems with boiler water, including:
      • Acidity (low pH)
      • Alkalinity
      • Chloride
      • Dissolved oxygen and carbon dioxide
      • Hydrocarbons
      • Hardness (Ca and Mg ions)
      • Iron and copper
      • Silica
      • Suspended solids
      • Dissolved solids
    • Possible preventative solutions are listed for each problem.

    Boiler Feedwater Sources

    • Boiler feedwater can be sourced from both untreated (surface and well water) and pretreated locations.
    • Local water chemistry is important to understand to determine what conditions need to be treated and how to size equipment.

    Municipal Water Treatment

    • Municipal potable water systems use three main steps to purify water:
      • Remove solids
      • Remove pathogens
      • Disinfect
    • The goal is to provide safe drinking water that is aesthetically acceptable.
    • Municipalities must meet target requirements of jurisdictional regulation.
    • Table 1 shows some of the most relevant parameters, including:
      • pH
      • Turbidity
      • Free chlorine
      • Total dissolved solids
      • Hardness
    • Municipal water is already treated, but still requires further treatment for dissolved gases, dissolved solids, and hardness.

    Municipal Water Treatment Process

    • The typical process involves:
      • Removing solids through screens and clarification
      • Removing remaining small particles through filtration
      • Disinfecting with chlorine, UV light, or ozone
    • The collected particles are further processed to recover available water and then sent to a landfill.

    Boiler Feedwater Treatment (Municipal Source Water)

    • When using municipal water as feedstock, it requires further processing to:
      • Reduce hardness
      • Remove oxygen and other dissolved gases
      • Adjust the pH
    • Care must be taken to minimize the amounts of iron, copper, and silica in the water.
    • Tables 2 and 3 show recommended ASME guidelines for boiler water quality.

    Boiler Feedwater Treatment (Non-Municipal Source Water)

    • For non-municipal sources, pre-treatment is essential before the water goes to the boiler house.
    • The first two stages of the process (clarification and filtration) are still required.
    • Disinfection using chlorine is not necessary, and ultraviolet or ozone systems can be used instead.
    • If the water has significant suspended solids, a settling pond can be used initially to remove most of the solids.

    Common Problems with Boiler Water

    • Table 4 shows some of the common potential problems with boiler water, including:
      • Acidity (low pH)
      • Alkalinity
      • Chloride
      • Dissolved oxygen and carbon dioxide
      • Hydrocarbons
      • Hardness (Ca and Mg ions)
      • Iron and copper
      • Silica
      • Suspended solids
      • Dissolved solids
    • Possible preventative solutions are listed for each problem.

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    Learn about the importance of understanding local water chemistry for boiler feedwater treatment, including sourcing and analyzing water quality reports.

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