Portable Sanitization Chamber

Transcription

1 Portable Sanitization Chamber Project Proposal Robertson Beauchamp, Jacob Blackburn, Lauren Kieffer, Elliot Nation, Angel Soto, Dangxian Zha December 11, 2013

2 Overview Client Objectives & Constraints Project Plan Concepts Engineering Analysis Final Design Robertson Beauchamp 1

3 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

4 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

5 Goal Develop a portable sanitization process that disinfects bioburden amounts past acceptable levels and is safe for various materials. Jacob Blackburn 4

6 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

7 Design Specifications Jacob Blackburn 6

8 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

9 QFD Jacob Blackburn 8

10 House of Quality Jacob Blackburn 9

11 Autoclave Hot water sanitization Above 135 o C for at least 3 minutes Too hot for certain materials Water would deteriorate certain materials Lauren Kieffer 10

12 Electron Beam Sanitizes through items Expensive Large scale Courtesy of Lauren Kieffer 11

13 Laser Sanitization Works with many materials Long cycle time Expensive Lauren Kieffer 12

14 Infrared Radiation Advantages: o Low cycle time o Compact o Minimum maintenance o Ease of use Disadvantages: o Cost to produce o Power required o Material incompatibility Lauren Kieffer 13

15 Chemical Processes Chemicals can kill 99% of bacteria Dry fog chemical sanitization Hydrogen Peroxide (H 2 O 2 ) is a safe chemical Entire rooms can be cleaned in minutes Lauren Kieffer 14

16 Chemical Fogging Courtesy of Lauren Kieffer 15

17 Hydrogen Peroxide Fogging Filter Placement Fogging Device Lauren Kieffer 16

18 Chemical Fogging 7% hydrogen peroxide solution Cold vapor is safe for materials sensitive to heat and water Filters must be used to break down H 2 O 2 Lauren Kieffer 17

19 Material Selection Must be compatible with H 2 O 2 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

20 Ultraviolet Light Maximum kill potential 2-15 minutes Cost efficient Only sanitizes outer surface Bulbs must be regularly cleaned Angel Soto 19

21 Ultraviolet Germicidal Irradiation Angel Soto 20

22 Ultraviolet Germicidal Irradiation Angel Soto 21

23 Ultraviolet Model Angel Soto 22

24 Weighting Characteristics Angel Soto 23

25 Decision Matrix Angel Soto 24

26 Combined UV/H 2 O 2 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

27 UV/H 2 O 2 Process Courtesy of: Elliot Nation 26

28 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

29 Final Design Drawing highlights key dimensions Portability is achieved Elliot Nation 28

30 Final Design Model Component View 3D Representation Elliot Nation 29

31 Mass Calculation Dangxian Zha 30

32 Cost Dangxian Zha 31

33 Project Plan Dangxian Zha 32

34 Project Plan Dangxian Zha 33

35 Conclusion The combined UV/H 2 O 2 process achieves design specifications by reducing bioburden levels past a certain threshold. Robertson Beauchamp 34

36 References Carlson, C., The Use of UV Lights for Disinfection. Arizona State University, From: Cole-Parmer. Material Compatibility With Hydrogen Peroxide. From: Ellis R.J, Moss C.E, W.E. Murray and W.H. Parr, Infrared Radiation, Heraeus Noblelight LLC, Infrared Heat for Disinfection in the Food Industry, 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 ], pp Occupational Safety and Health Administration, General Industry 29 CFR 1910: Hazardous and Toxic Substances, U. S. Department of Labor, Subpart Z. from url: SLTC/hazardoustoxicsubstances/index.html PathCon Laboratories, The Microbial Bioburden of USP 797 Compliance,

37 References Rao, Shridhar PN, Sterilization and Disinfection, 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: doi: /anie Ultraviolet Disinfection: Crucial Link in the Sterilization Chain. Terra Universal Inc. From: pdf W.L. Gore, Portable Sanitization Chamber for Medical Manufacturing Use,

38 Questions? 37