P13411:High Temperature Waste Pasteurizer

Kyle Weston – Team Lead Eng.Kyle Cohn – Lead Structural Eng.Brian Kilger – Lead Manufacturing Eng.Stephanie Mauro – Lead Thermal Eng.

Agenda Project Description

Customer Needs Engineering Specifications Concept Summary

System Architecture Design Summary

Prototype Design Ideal Design

Cost Analysis Results of Testing Project Evaluation

Suggestions for Improvement

Project Description To design an inexpensive waste pasteurizer to

transform waste into a safe to use fertilizer using renewable energy and materials available in Haiti.

Customer Needs:CN# Description Customer RankingCN1 Contain pathogens during process 9CN2 Make end product free of pathogens 9CN3 Cost <$50 9CN4 Safe human interface 9CN5 Environmental resistance 9CN6 Easily repaired 3CN7 Easy to load/unload 3CN8 Easy to use 3CN9 Easy to relocate 3CN10 Use local materials 3CN11 Minimize time required to pasteurize 1CN12 Meet the needs of a family of 3-5 people 1CN13 Communicate to the user that temperatures have been reached 1

Time to Pasteurize

Engineering SpecsSpec # CN # Importance Description Measure of

PerformanceEngineering

UnitsMarginal

Value Ideal Value

ES1 CN2, CN11 9Provide heat to waste using renewable energy in order to kill pathogens

Temperature, Time °C, hours 50 °C for 1

week63 °C for 1

hour

ES2 CN4 9 Vent combustive gasses in order to prevent explosions and smell

Amount of methane inside chamber

ppm 50,000 Less than 30,000

ES3 CN1, CN4 9 Contain pathogens, do not allow unsafe leakage of untreated wastes Is there leakage? Binary

(Yes/No) No No

ES4 CN4 9 Temperature of the access door or handle Temperature °C 50 °C 38 °C

ES5 CN1, CN5 9 Are any electrical components sealed from possible water damage?

IEC60529 Digit 2Level O-8

Binary (Yes/No) No No

ES6 CN1, CN5 3 The product should withstand the winds experienced by Haiti

Does the product withstand wind mph 20 mph 25 mph

ES7 CN4, CN7, CN8 3 Customer must be able to easily add,

stir (optional) and remove wasteTime to add, stir and remove material

minutes

ES8 CN12, CN7, CN9, CN11 3 Volume of product accommodated Volume Liters 3 liters 5 liters

ES9 CN2, CN11 9 Does the entire sample of human waste contain safe pathogen levels Temperature

ES10 CN13 1 Show Disinfection has taken place Yes Yes

Did not pass Not necessary Pass marginal value Pass ideal value

Concept Selection Datums

Capetown Project (left) Cookit (right)

3 Concepts with highest scores from Pugh Chart

Combined features from the top 3 concept into one design

Systems Architecture

Design Summary: Assembly

Design Summary: iPooP Indicator of Pasteurization of our Poop

Spring Chamber

Wax Chamber

Spring

Wax

Divider Piece

Push Rod

Cost Analysis Total cost of Prototype: $209.11

Some parts needed to be purchased in large lot sizes

Some parts were donated by the MSD department

Total cost of mass produced unit: $63.47 Includes all necessary parts in price

(Customers provide no extra materials) Plenty of opportunities exist to reduce price

Results: Heat Test

Temperature inside inner pot reached 65.5 C for 1 hour iPooP successfully indicated pasteurization Handle did not stay below 49 C

Results: Wind Test

Preliminary testing resulted in design change of permanently securing reflectors in place

Showed no signs of degradation or tipping while experiencing 20 mph winds

Could not be tested at 25mph wind speeds

Reflector Angle: 30°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13 16 18 12 19.3 20 12 10 7 9

Reflector Angle: 60°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13.8 12.5 13.2 19.8 12.8 16.9 18.9 17.4 12 8

Reflector Angle: 90°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13.8 14.8 16.9 16.5 9 14 15.7 15.9 12.7 16.7

Results: Additional Tests Leak Test: No water leaked from inner bucket

to outer bucket Load Test: 5 subjects were each able to load

and unload the pasteurizer in under 1 minute Volume Test: Pasteurizer held minimum

requirement of 3L of water Durability Test: Pasteurizer withstood strong

kick Wax Melting Temperature Test: Selected

wax used in iPooP has a melting temperature of 58.8 °C

Evaluation Successful accomplishments:

Re-usable pasteurizer Does not need potable water Pasteurizes waste in 2.5 hours based on iPooP Most components can be replaced or repaired in Haiti

Potential Improvements Handle of pot reaches too high of a temperature and

would need to be allowed time to cool before handling

Wax in iPooP melts at a temperature below the ideal pasteurization temperature

iPooP can not be easily replaced in Haiti

Lessons Learned Should have considered handle temp requirement

when purchasing pot Should have ordered wax and tested melting

temperatures earlier Should have allotted more time for testing Should have acquired materials from what was

available as extra and from the machine shop

Suggestions for Improvement Testing in Rochester in Spring/Summer Testing in Haiti (actual environment) Use of cheaper materials or materials more

readily available in Haiti Possibility of using in conjunction with Portable

Multi Use Shelter (P13414) Possibility of using in conjunction with Bloom Box

Solid Oxide Fuel Cell, which is powered by biomass: http://www.greentechmedia.com/articles/read/a-bloom-box-for-your-pocket

Acknowledgements Guide: John Kaemmerlen Customer: Sarah Brownell

Machine Shop Brian Thorn Carl Lundgren John Wellin

Thank You for your Support and Guidance