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WW Sacramento Vol 1 > Chap 2 Why Treat Wastes? > Flashcards

Chap 2 Why Treat Wastes? Flashcards

1
Q

Wastes should have a pH similar to that of the receiving water before they are discharged. True or False?

A

True

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2
Q

Chemical Changes in living organisms are involved in nutrient cycles. True or false?

A

True

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3
Q

Fresh flowing mountain streams are always free of “impurities”. True or false?

A

False

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4
Q

An operator’s best defense against infections and disease is good personal hygiene. True or false?

A

True

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5
Q

Domestic wastewater contains only organic wastes. True or false?

A

False

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6
Q

An indication of possible pathogenic bacterial contamination is the presence of coliform group bacteria. True or false

A

True.

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7
Q

To work for their benefit in treatment plants, natural cycles are controlled and accelerated by treatment plant operators. True or false

A

True.

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8
Q

Best Answer: Pathogenic organisms are commonly killed by which wastewater treatment process?

  1. Activated sludge
  2. Disinfection
  3. Primary sedimentation
  4. Sterilization
A
  1. Disinfection
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9
Q

Best Answer: In wastewater treatment plants, how can the sludge and scum be removed?

  1. Aerobic treatment
  2. Biological treatment
  3. Primary treatment
  4. Secondary treatment
A
  1. Primary treatment
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10
Q

Best Answer: Oxygen depletion in a stream is caused by what factor?

  1. Aerobic bacteria feeding on oxidizable wastes
  2. Chemical reactions involving oxygen
  3. Loss of dissolved oxygen to the atmosphere.
  4. Respiration by fish.
A
  1. Aerobic bacteria feeding on oxidizable wastes
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11
Q

Best Answer: Imhoff cones are used to measure which water quality indicator?

  1. Dissolved solids
  2. Floatable solids
  3. Settleable solids
  4. Suspended solids
A
  1. Settleable solids
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12
Q

Best Answer: Why are nutrients undesirable in treated wastewaters?

  1. Create taste-and odor-producing substances.
  2. Encourage excess algal and plant growth
  3. Interfere with aquatic life.
  4. Produce toxic substances.
A
  1. Encourage excess algal and plant growth
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13
Q

Best Answer: Sulfur compounds are converted to which compound when no dissolved oxygen is present in water?

  1. Potential for excess algal growth
  2. Presence of inadequately treated wastewater
  3. Probable presence of pathogenic organisms
  4. Toxic substances harmful to aquatic life
A
  1. Presence of inadequately treated wastewater
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14
Q

Best Answer: Floatable solids are undesirable in a plant effluent because they indicate which problem?

  1. Potential of excess algal growth
  2. Presence of inadequately treated wastewater.
  3. Probable presence of pathogenic organisms.
  4. Toxic substances harmful to aquatic life.
A
  1. Presence of inadequately treated wastewater.
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15
Q 
Multiple Choice: major types of wastes include which of the following?
1. dilution wastes.
2. Inorganic wastes.
3 Organic wastes.
4. Radioactive wastes.
5. Thermal wastes.
A
  1. Inorganic wastes.
    3 Organic wastes.
  2. Radioactive wastes.
  3. Thermal wastes.
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16
Q

Multiple Choice: Sources of organic industrial wastes could include which of the following industries?

  1. Dairy processing
  2. Meat packing
  3. Printed circuit board manufacturing.
  4. Tanning
  5. Water softening.
A
  1. Dairy processing
  2. Meat packing
  3. Tanning
17
Q

Multiple Choice: Oxygen depletion in a steam can cause what kinds of problems?

  1. Algal blooms
  2. Fish kills
  3. Illness
  4. Odors
  5. Supersaturation
A
  1. Fish kills

4. Odors

18
Q

Multiple Choice: Sludge and scum must be removed from wastewater in treatment plants for which of the following reasons?

  1. Are unsightly.
  2. May be a source of odors
  3. May cause oxygen depletion
  4. Represent a loss of a valuable resource
  5. Should be reclaimed and recycled
A
  1. Are unsightly.
  2. May be a source of odors
  3. May cause oxygen depletion
19
Q

Multiple Choice: The biological activities of algae can appreciate affect which water quality indicators?

  1. Alkalinity
  2. Dissolved oxygen
  3. Pathogens
  4. pH
  5. Toxicity
A
  1. Alkalinity
  2. Dissolved oxygen
  3. pH
20
Q

Multiple Choice: Hydrogen sulfide can cause what kinds of problems?

  1. Corrosion
  2. Explosive mixture with air
  3. Odors
  4. Paralyzes respiratory system
  5. Toxic gases
A

All of the answers:

  1. Corrosion
  2. Explosive mixture with air
  3. Odors
  4. Paralyzes respiratory system
  5. Toxic gases
21
Q

Multiple Choice: The intent of the NPDES permit program is to make the nation’s waters suitable for which beneficial uses?

  1. Amount of flow into the receiving stream.
  2. Flsh life
  3. Navigation
  4. Swimming
  5. Wildlife
A
  1. Flsh life
  2. Swimming
  3. Wildlife
22
Q

Multiple Choice: Which of the following factors can determine whether any problems are caused in receiving waters by the discharge of treated wastewaters?

  1. Amount of flow in the receiving steam.
  2. Characteristics of wastewater from plant.
  3. Quality of the receiving waters.
  4. Size of flow from treatment plant.
  5. Type of degree of treatment.
A
  1. Amount of flow in the receiving steam.
  2. Characteristics of wastewater from plant.
  3. Quality of the receiving waters.
  4. Size of flow from treatment plant.
  5. Type of degree of treatment.
23
Q

Multiple choice: What should an operator do after working an arithmetic problem involving the operator’s job?

  1. Check calculations.
  2. Continue to operator the plant without consideration of calculations.
  3. Examine answer to see if it appears reasonable.
  4. Have another operator check work before making any changes.
  5. Immediately make any appropriate changes.
A
  1. Check calculations.
  2. Examine answer to see if it appears reasonable.
  3. Have another operator check work before making any changes.
24
Q

Which of the following are objectives used by operators of wastewater treatment plants to operate their plants?

  1. Maintain an effective preventive maintenance program
  2. Meeting NPDES permit requirements.
  3. Minimizing costs.
  4. Minimizing odors to avoid nuisance complaints.
  5. Removing wastes from the wastewater to protect the receiving waters.
A

All the answers.

  1. Maintain an effective preventive maintenance program
  2. Meeting NPDES permit requirements.
  3. Minimizing costs.
  4. Minimizing odors to avoid nuisance complaints.
  5. Removing wastes from the wastewater to protect the receiving waters.
25
Q

An NPDES permit may specify which of the following items?

  1. Acceptable range of pH values.
  2. Frequency of collecting samples.
  3. Minimum budget for plant O&M
  4. Monthly average and maximum levels of suspended solids.
  5. Virtually no substances toxic to organisms.
A
  1. Acceptable range of pH values.
  2. Frequency of collecting samples.
  3. Monthly average and maximum levels of suspended solids.
  4. Virtually no substances toxic to organisms.

WW Sacramento Vol 1 (3 decks)

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