Portable Sanitization Chamber Project Proposal Robertson Beauchamp, - - PowerPoint PPT Presentation

Portable Sanitization Chamber

Project Proposal

Robertson Beauchamp, Jacob Blackburn, Lauren Kieffer, Elliot Nation, Angel Soto, Dangxian Zha

December 11, 2013

Overview

• Client
• Objectives & Constraints
• Project Plan
• Concepts
• Engineering Analysis
• Final Design

Robertson Beauchamp 1

Client

• W.L. Gore & Associates, Inc.
• International Company
• Medical, fabrics, and other products
• Local office in Flagstaff, AZ
• Looking to prepare incoming engineers by

sponsoring real-world application projects.

Robertson Beauchamp 2

Need Statement

• The client currently has access to sterilization systems

that use either harsh chemicals, or a large amount of heat that can damage various materials.

• The client needs a current sanitization device that is

portable and safe for various materials such as plastics and papers.

Jacob Blackburn 3

Goal

• Develop a portable sanitization process that

disinfects bioburden amounts past acceptable levels and is safe for various materials.

Jacob Blackburn 4

Objectives

• Sanitizes within regulation bioburden levels
• Chemical exposure and residue within regulated concentration
• Materials sanitized retain functionality
• Sanitization system characterizes portability
• Cost to produce is comparatively inexpensive
• Quick sanitization cycle time

Jacob Blackburn 5

Design Specifications

Jacob Blackburn 6

Operating Environment

• Sanitize test strips contaminated with Bacillus

atrophaeus used to evaluate bioburden level reduction

• Hydrogen peroxide test strips placed within chamber

proximity to monitor exposure levels

Jacob Blackburn 7

QFD

Jacob Blackburn 8

House of Quality

Jacob Blackburn 9

Autoclave

• Hot water sanitization
• Above 135 oC for at least 3 minutes
• Too hot for certain materials
• Water would deteriorate certain materials

Lauren Kieffer 10

Electron Beam

• Sanitizes through

items

• Expensive
• Large scale

Courtesy of www.ebeamservices.com

Lauren Kieffer 11

Laser Sanitization

Lauren Kieffer 12

• Works with many

materials

• Long cycle time
• Expensive

Infrared Radiation

• Advantages:
• Low cycle time
• Compact
• Minimum maintenance
• Ease of use

Lauren Kieffer 13

• Disadvantages:
• Cost to produce
• Power required
• Material

incompatibility

Chemical Processes

• Chemicals can kill 99% of bacteria
• Dry fog chemical sanitization
• Hydrogen Peroxide (H2O2) is a safe chemical
• Entire rooms can be cleaned in 15-30 minutes

Lauren Kieffer 14

Chemical Fogging

Courtesy of http://www.gotfog.com

Lauren Kieffer 15

Hydrogen Peroxide Fogging

Fogging Device Filter Placement

Lauren Kieffer 16

Chemical Fogging

• 7% hydrogen peroxide solution
• Cold vapor is safe for materials sensitive to heat and

water

• Filters must be used to break down H2O2

Lauren Kieffer 17

Material Selection

• Must be compatible with H2O2 at various

concentrations.

• Aluminum, PVC and PTFE - No negative reactions
• Aluminum used for enclosure, door, handles, hinges,

etc.

• PVC and PTFE used in fogging components, tubing and

nozzle.

Lauren Kieffer 18

Ultraviolet Light

• Maximum kill potential 2-15 minutes
• Cost efficient
• Only sanitizes outer surface
• Bulbs must be regularly cleaned

Angel Soto 19

Ultraviolet Germicidal Irradiation

Angel Soto 20

Ultraviolet Germicidal Irradiation

Angel Soto 21

Ultraviolet Model

Angel Soto 22

Weighting Characteristics

Angel Soto 23

Decision Matrix

Angel Soto 24

Combined UV/H2O2 Process

• Eliminates need for filter
• Creates free hydroxyl radicals, OH-, that are

strong oxidizing agents.

• Radicals degrade additional toxins.
• Study shown this process inactivates

Bacillus atrophaeus spores.

Elliot Nation 25

UV/H2O2 Process

Courtesy of: www.trojanuv.com

Elliot Nation 26

Material Selection

• Aluminum used for enclosure.
• PVC and PTFE used in fogging device.
• Borosilicate glass used in between enclosure

and UV lights.

• High UV transmittance, protects bulbs from

fog and dust.

Elliot Nation 27

Final Design

Elliot Nation 28

• Drawing highlights

key dimensions

• Portability is

achieved

Final Design Model

Elliot Nation 29

3D Representation

Component View

Mass Calculation

Dangxian Zha 30

Cost

Dangxian Zha 31

Project Plan

Dangxian Zha 32

Project Plan

Dangxian Zha 33

Conclusion

• The combined UV/H2O2 process achieves

design specifications by reducing bioburden levels past a certain threshold.

Robertson Beauchamp 34

References

Carlson, C., The Use of UV Lights for Disinfection. Arizona State University, From: https://cfo.asu.edu/node/2667 Cole-Parmer. Material Compatibility With Hydrogen Peroxide. From: http://www.ozoneservices.com/articles/004.htm Ellis R.J, Moss C.E, W.E. Murray and W.H. Parr, Infrared Radiation, 2013. Heraeus Noblelight LLC, Infrared Heat for Disinfection in the Food Industry, 2013. Iannotti, M. T. and Pisani Jr. R., Inactivation of Bacillus atrophaeus spores in healthcare waste by uv light coupled with H2O2.

• Braz. J. Chem. Eng. [online]. 2013, vol.30, n.3 [cited 2013-12-10], pp. 507-519.

Occupational Safety and Health Administration, General Industry 29 CFR 1910: Hazardous and Toxic Substances, U. S. Department of Labor, Subpart Z. from url:https://www.osha.gov/ SLTC/hazardoustoxicsubstances/index.html PathCon Laboratories, The Microbial Bioburden of USP 797 Compliance, 2009 35

References

Rao, Shridhar PN, Sterilization and Disinfection, 2009. Rutala, W., Weber, D., Guideline for Disinfection and Sterilization in Healthcare Facilities, 2008, Department of Health and Human Services, 2008 Sakthivel, S. and Kisch, H. (2003), Daylight Photocatalysis by Carbon-Modified Titanium Dioxide. Angew. Chem. Int. Ed., 42: 4908–4911. doi: 10.1002/anie.200351577 Ultraviolet Disinfection: Crucial Link in the Sterilization Chain. Terra Universal Inc. From: http://www.terrauniversal.com/images/tools/catalog/uvc_germicidal_irradiation_082510135200. pdf W.L. Gore, Portable Sanitization Chamber for Medical Manufacturing Use, 2013. 36

Questions?

37