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CHEE 450 Design Project: Air Filtration . Kelsea Fitzpatrick | Kristen DeJong | Kelsey Barton. Presentation Outline . Introduction and Design Considerations Aerosols HEPA Filters Filtration Mechanisms Proposed Design Alternatives. Introduction and Design Considerations.

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chee 450 design project air filtration

CHEE 450 Design Project:Air Filtration

Kelsea Fitzpatrick | Kristen DeJong | Kelsey Barton

presentation outline
Presentation Outline
  • Introduction and Design Considerations
  • Aerosols
  • HEPA Filters
  • Filtration Mechanisms
  • Proposed Design
  • Alternatives
introduction and design considerations
Introduction and Design Considerations
  • Air filter is initial step in insulin process, sterilizing fermentor feed
  • SuperPRO output:
    • Fermentation as batch process
    • Feed composition of ammonia, nitrogen, and oxygen
    • Unspecified particulate matter
    • 1166 m3/hr average flowrate
  • Sterilized air required for fermentor to ensure no batch contamination
aerosols
Aerosols
  • Solid and liquid contaminants suspended in gas streams
  • Typical size: 0.001 µm to 100 µm
  • Particulates follow lognormal distribution
  • Examples: Soil, bacteria, pollen…

Soil Particles (magnified) E. coli bacteria Pollen Particles (magnified)

hepa filters

Vacuum cleaner HEPA filter

HEPA Filters
  • High Efficiency Particulate Filter
  • Removes at least 99.97% of air borne particles > 0.3 µm
  • Requires prefilter system to capture larger particles
  • Initially developed in 1940’s for a top-secret method of eliminating radioactive particulate
  • Currently used in: electronic, medical, pharmaceutical, and nuclear fields
proposed design
Proposed Design
  • Recommended filters from Cambridge Filter Corp
  • Prefilter
    • Aero-Answer Mate - $75.00
    • 60-65% efficiency
    • 1580 m3/h
  • HEPA Filter
    • Absolute Filter - $160.00
    • 99.97% efficiency
    • 1680 m3/h
  • Considerations
    • Moisture susceptibility
    • Replacement cost and frequency
alternatives

Ozone molecule

Alternatives
  • Air filtration alternatives
    • Ozone (O3) injection
    • UV Radiation
    • Gas Scrubbing
    • Heat
  • Serves to kill biological particles but not necessarily remove all physical or chemical particles
  • Less economical