Title

The Use of Gravity to Power a UV Light Purification System

Author(s)

Jacob HoFollow

School Name

Spring Valley High school

Grade Level

11th Grade

Presentation Topic

Engineering

Presentation Type

Non-Mentored

Abstract

1,000,000 people die each year due to a lack of clean water (Water.org). As technology advances, novel and more efficient ways of creating more clean water should be pursued. One universally available, easily accessible, and heavily underused energy source is gravity. The goal of this research was to determine if gravity could provide sufficient energy to sterilize water by remodeling Shell’s GravityLight. It was believed that the resulting device would be able to produce 200 milliliters of sterilized water in 7 minutes. The device was created by repurposing the GravityLight to power a UVC-LED. A stock of E. coli contaminated water was created to test and water sterility was measured using the membrane filtration method. It was found that around 25.1333% of the bacteria were killed off by the prototype. A t-test of the data was performed with an alpha value of 0.05. There was no significant difference between the number of colony forming units before and after sterilization, p= 0.76 In conclusion, the current state of the prototype is ineffective and further improvements and testing need to be done on this method of sterilization.

Location

Founders Hall 222 B

Start Date

3-30-2019 11:45 AM

Presentation Format

Oral and Written

Group Project

No

COinS
 
Mar 30th, 11:45 AM

The Use of Gravity to Power a UV Light Purification System

Founders Hall 222 B

1,000,000 people die each year due to a lack of clean water (Water.org). As technology advances, novel and more efficient ways of creating more clean water should be pursued. One universally available, easily accessible, and heavily underused energy source is gravity. The goal of this research was to determine if gravity could provide sufficient energy to sterilize water by remodeling Shell’s GravityLight. It was believed that the resulting device would be able to produce 200 milliliters of sterilized water in 7 minutes. The device was created by repurposing the GravityLight to power a UVC-LED. A stock of E. coli contaminated water was created to test and water sterility was measured using the membrane filtration method. It was found that around 25.1333% of the bacteria were killed off by the prototype. A t-test of the data was performed with an alpha value of 0.05. There was no significant difference between the number of colony forming units before and after sterilization, p= 0.76 In conclusion, the current state of the prototype is ineffective and further improvements and testing need to be done on this method of sterilization.