P ORTABLE S ANITIZATION C HAMBER Robertson Beauchamp, Jacob Blackburn, Lauren Kieffer, Elliot Nation, Angel Soto, Dangxian Zha April 25, 2014
O VERVIEW ● Introduction ● Problem Formulation ● Sanitizing Methods ● Proposed Design ● Prototyping ● Testing and Results ● Final Design ● Cost Analysis ● Conclusion 1 Elliot Nation
I NTRODUCTION • W.L. Gore & Associates • Portable Sanitization Chamber • Decrease bioburden levels of Bacillus atrophaeus CLICK TO EDIT MASTER TITLE STYLE • $3,000 budget 2 Elliot Nation
C LIENT N EEDS W.L. Gore is looking for a device that is: • Safe for all users • Portable CLICK TO EDIT MASTER TITLE STYLE • Reduces the level of bioburdens on various materials • Cost efficient • Time efficient 3 Elliot Nation
G OAL To develop a portable sanitization process that disinfects items to acceptable bioburden levels. CLICK TO EDIT MASTER TITLE STYLE Elliot Nation 4
Problem Formulation Design requirements are derived from client needs and the scope of the project as: ● Objectives ● Constraints CLICK TO EDIT MASTER TITLE STYLE Contemporary sanitizing methods are compared against objectives to reveal feasible solutions. 5 Angel Soto
O BJECTIVES CLICK TO EDIT MASTER TITLE STYLE 6 Angel Soto
C ONSTRAINTS • Ease of Use Complies with door size standards (3’x3’x6’) o o Acceptable cycle time (15 minutes) o Cycle ends automatically CLICK TO EDIT MASTER TITLE STYLE • No Ethylene Oxide (EtO) • Temperature less than 120°C 7 Angel Soto
S ANITIZING M ETHODS From research, numerous methods were found that sanitize and sterilize equipment in the food and medical field. • Autoclave - Steam at high temperature and pressure CLICK TO EDIT MASTER TITLE STYLE • Chemical spray - Exposure to germicidal chemicals • Infrared light - Specific wavelength generates heat • Laser exposure - Germicidal light for precision use • Ultraviolet (UVC) light - Germicidal light exposure 8 Angel Soto
P ROPOSED D ESIGN • Dual process: o Vaporized hydrogen peroxide (H 2 O 2 ) o UVC light • Fog machine used to vaporize the H 2 O 2 • UVC lights degrade H 2 O 2 to safe levels CLICK TO EDIT MASTER TITLE STYLE • Free hydroxyl radicals, OH-, that are strong oxidizing agents, degrade additional toxins. • Aluminum chamber- not reactive with H 2 O 2 9 Angel Soto
P ROPOSED D ESIGN 10 Jacob Blackburn
P ROTOTYPE 11 Jacob Blackburn
P ROTOTYPE 4 UVC lights installed Fogging unit on the back panel 12 Jacob Blackburn
S AFETY C OMPONENTS • Sealant around the door and panels • Safety Switch • Magnetic Lock • PET Plastic window that protects user from UVC light • Emergency Button Jacob Blackburn 13
C ONTROL S YSTEM • Arduino Mega Microcontroller • Will run code and logic for automated process and user interface 14 Dangxian Zha
L OGIC F LOW C HART 15 Dangxian Zha
C ONTROL S YSTEM • Start Button • Emergency Button • Safety Switch • Magnetic Lock • Fog Machine • UVC Lights • LCD/LED 16 Dangxian Zha
F IRST R OUND OF T ESTING Lauren Kieffer 17
O PTIMIZATION 18 Lauren Kieffer
S ECOND R OUND OF T ESTING 19 Lauren Kieffer
T HIRD R OUND OF T ESTING Run Components Time Concentration Results H 2 O 2 30 seconds 3 mg/L 7 >10,000% UV lights 40 seconds 8 light bulbs Run 7: Hemostat H 2 O 2 30 seconds 3 mg/L 8 3000% Run 8:Tackle Toolbox UV lights 40 seconds 8 light bulbs Run 9: Notebook H 2 O 2 30 seconds 3 mg/L 9 98% of 1 log UV lights 40 seconds 8 light bulbs 20 Lauren Kieffer
F INAL P ROTOTYPE 21 Robertson Beauchamp
O BJECTIVES AND C ONSTRAINTS Robertson Beauchamp 22
O BJECTIVES AND C ONSTRAINTS 80 lbs 23 Robertson Beauchamp
C OST A NALYSIS 24 Robertson Beauchamp
C ONCLUSION Through the testing and results, all but one of the requirements were met under the given constraints. Other systems would be implemented such as a humidity sensor and UVC light check. CLICK TO EDIT MASTER TITLE STYLE The size of the chamber is fully scalable and can be modified for smaller or larger applications allowing for more portability or larger items. Further optimization testing would result in a shorter cycle time. Elliot Nation 25
R EFERENCES Braz. J. Chem. Eng. vol.30 no.3 São Paulo July/Sept. 2013, “Inactivation of Bacillus atrophaeus spores in healthcare waste by UVC light coupled with H2O2”, 2012 Koninklijke Philips Electronics N. V., TUVC T8 , May 2013. Occupational Safety and Health Administration, General Industry 29 CFR 1910: Hazardous and Toxic Substances, U. S. Department of Labor Sridhar Rao PN, Sterilization and Disinfection, 2009. W.L. Gore, Portable Sanitization Chamber for Medical Manufacturing Use , 2013.
Q UESTIONS
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