Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

AQ Quiz 4

Modules 15 and 16

Features of particles Wide size range Small particles don't settle out easily Wet particles easier to capture Particles can gain a charge
Emissions reduction efficiency (Enter-exit)/exit * 100%
Cascade impactor Seven plates that collect different size particles all at once
Before you pick your PCD, you should know what about the particle? Size, stack gas temperature, stack gas moisture
Gravitational settling Slow velocity, long device. Good for >50 AED micrometersparticles
Inertial compaction The gas is able to turn corners quickly but the particulate does not- baffle collectors, cyclones, and centrifugal collectors.
Cyclones Air comes in at top and spirals downwards- the particulate drops out due to the inertia of impact with side of cylinder
Centrifugal collector basically a giant fan that spits out particulate that gets collected on the blades
Wet scrubbers 1. Direct interception, inertia, brownian movement 2. Droplet sweep - make sure interaction happens
Types of wet scrubbers Spray tower and venturi
Electrostatic precipitators Charge the particles then collect with an oppositely charged plate
Filtration systems Basically a bag vacuum (Baghouse) May be shaken or reverse air cleaned. Shaken has a dirty and clean side
Which removal systems have highest efficiency? Baghouse filter and venturi scrubber
Why is size unimportant when choosing a PCD for gases/vapors? The molecules are the same size
Factors affecting rate of absorption Temperature, SA, Glow of absorbant and gas
Bubble cap absorption scrubber Pollutant gas bubbles up through trays causing pollutants to get trapped in liquid
Counter current packed absorbtion scrubber Liquid filtered down onto packing creating a film. Gas goes up and gets stuck
Absorption scrubber efficiency 95% - gets better with more height and diameter
Types of adsorbants GAC, activated alumina, molecular sieves
Packed GAC beds The offline bed is steam heated to release VoC which can be recovered. Once dry, bed is reused.
How can you condense gases? Decrease temperature, increase pressure, or both
Condensation May be indirect or direct. Indirect most common- tube and shell (gas inside tube, has a cool shell- like an ice bath)
Condensation issues Tube fouling, tube corrosion, specific loading
Incineration of gases Destruction removal efficiency- 99.999% Produces radicals which destroy more pollutant
Combustion issues Incomplete combustion leads to carbon monoxide, byproducts, efficiency slips, Halogens and sulfurs
Incinerator types Thermal oxidation (TOX) Thermal oxidation w/heat recovery (THROX) Catalytic oxidation
Are flares a PCD? No- their efficiency is too low. This is a back up measure
Biological methods Biofilters for example. Efficient but requires lots of management
Created by: swilson67
Popular Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards