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Community Exposure > Pollution Control Devices > Flashcards

Pollution Control Devices Flashcards

1
Q

Baghouse cleaning mechanism

A

Filtration

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2
Q

What is the most common type of pollution control?

A

Baghouse filters

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3
Q

What particle sizes do baghouse filters collect?

A

> 0.25 microns

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4
Q

Absorber

A

Liquid picks up gases and absorbs them. Gases counter flow of liquid. Similar to scrubber. Gases and vapors absorbed into liquid. Liquid must be good solvent for gases and vapors. Liquid is recycled.

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5
Q

Adsorber

A

Vapors and gases adsorbed on surface of porous medium. Does not work at high temperatures.

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6
Q

Condenser

A

Vapor is passed through cooling coils and condensed liquid is removed.

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7
Q

Cleaning mechanism of cyclones

A

Centrifugal force

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8
Q

Cleaning mechanism of scrubber

A

Inertial impingement

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9
Q

Venturi Scrubber

A

Uses narrowing duct to increase pressure, condensation, and collection efficiency.

  • Similar to regular scrubber but liquid spray area is narrower to focus spray.
  • The wet particles generally go to bag house.
  • High energy costs.
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10
Q

Is a baghouse system or a cyclone system more effective at collecting particles?

A

Baghouse

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11
Q

What particle sizes do cyclones collect (small diameter)

A

> 5 microns

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12
Q

What would be the best pollution control for a woodworking shop?

A

Settling chamber or cyclone

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13
Q

An industrial hygienist (IH) needs to identify and recommend a pollution control device for exhaust gases and vapors of a very hot and humid process. Which of the following devices would be the best choice?

A. Absorber
B. Adsorber
C. Baghouse
D. Venturi scrubber

A

A baghouse and venturi scrubber are both used to control particulates, not gases or vapors. Adsorbers, like adsorbent sampling tubes, do not work well at high temperature or high humidity.

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14
Q

Max baghouse temperature

A

550F

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15
Q

Cleaning mechanism for venturi scrubber

A

Inertial impingement and centrifugal force

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16
Q

Cleaning mechanism for electrostatic precipitator

A

Electrostatic attachment

17
Q

Particle size that electrostatic precipitators collect

A

> 0.25 um

18
Q

Particle size that a venturi scrubber collects

A

> 1 um

19
Q

Best pollution control device for gases/vapors in a hot/humid process

A

Absorber

20
Q

Best pollution control device for a combustible dust

A

Wet scrubber

21
Q

Which pollution control devices capture particulates >1um

A

Venturi scrubber

22
Q

Which dust collection method is best for plastic extrusion machines

A

Electrostatic precipitator

23
Q

Which pollution control device can capture small particles (>0.25 um) with minimal pressure drop?

A
  • Electrostatic precipitator
  • Pressure drop is 0.5 in h2o (whereas baghouse is 3-6 in h20)

Community Exposure (3 decks)

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