gatesnotes
The blog of Bill Gates
gatesnotes
The blog of Bill Gates

And the Winners of the Reinvent the Toilet Challenge Awards are…?

Sign In
 
My Profile & Settings
Log out
GO
Filter By
Posts
Videos
Your search for "", with selected filters, does not match any posts. Please try again with a different search term or reset filters.

Popular searches include: Books, Malaria, and Future of Food.
RELATED ARTICLES ON
Please complete your account verification. Resend verification email.
This verification token has expired.
Your email address has been verified. Update my profile.
Your account has been deactivated. Sign up to re-activate your account.
View all newsletters in the newsletter archive
You are now unsubscribed from receiving emails.
Sorry, we were unable to unsubscribe you at this time.
Logout:


Become a Gates Notes Insider
- or - Sign up with email
This email is already registered. Enter a new email, try signing in or retrieve your password
Send me updates from Bill Gates
Sign Up
Join the Gates Notes community to access exclusive content, comment on stories, subscribe to your favorite topics and more. We will never share or spam your email address. For more information see our Sign Up FAQ. By clicking "Sign Up" you agree to the Gates Notes Terms of Use / Privacy Policy.
Account Settings
VIEW & EDIT PROFILE
Your Information
First name
Last name
Save
Cancel
Email address
This email is already registered
Save
Cancel
Please verify email address. Click verification link sent to this email address or resend verification email.
Password
Save
Cancel
Send me updates from Bill Gates
You must provide an email
Your Interests
Saving Lives
Energy Innovation
Improving Education
Philanthropy
Book Reviews
About Bill Gates
Deactivate Account
Click the link below to begin the account deactivation process. Deactivate account If you want to permanently delete your account and remove its content, please send us a request here.
Ok
Gates Notes Insider Sign Up FAQ

Q. How do I create a Gates Notes account?

A. There are three ways you can create a Gates Notes account:

  • Sign up with Facebook. We’ll never post to your Facebook account without your permission.
  • Sign up with Twitter. We’ll never post to your Twitter account without your permission.
  • Sign up with your email. Enter your email address during sign up. We’ll email you a link for verification.

Q. Will you ever post to my Facebook or Twitter accounts without my permission?

A. No, never.

Q. How do I sign up to receive email communications from my Gates Notes account?

A. In Account Settings, click the toggle switch next to “Send me updates from Bill Gates.”

Q. How will you use the Interests I select in Account Settings?

A. We will use them to choose the Suggested Reads that appear on your profile page.

Forgot your password?
This email is already registered. Enter a new email, try signing in or retrieve your password
Reset Password
Change your header photo
your image
 
Change
your image
Uh Oh!

The image you are trying to upload is either too big or is an unacceptable format. Please upload a .jpg or .png image that is under 25MB.

Ok
First name
Last name
Enter a first and last name. For example, "Richard Feynman"
Bio
0/160 characters
Edit Profile
Account Settings
Save
Cancel
Suggested Reads
Reset your password.
Set New Password
Your password has been reset. You will now be redirected to the sign in page, or you can click here
Ok
Get emails from Bill Gates
Send me updates from Bill
You must provide an email
This email is already registered
Continue
We will never share or spam your email address. For more information see our Sign Up FAQ. By clicking "Continue" you agree to the Gates Notes Terms of Use / Privacy Policy.
 
your image
Uh Oh!
The image you are trying to upload is either too big or is an unacceptable format. Please upload a .jpg or .png image that is under 25MB.
Ok
Welcome FirstName!
You are now a Gates Notes Insider
Update Your Profile Information
First name
Last name
Save
Cancel
Email address
This email is already registered
Save
Cancel
Please verify email address. Click verification link sent to this email address or resend verification email.
Send me updates from Bill Gates
You must provide an email
Select Your Interests
Saving Lives
Energy Innovation
Improving Education
Philanthropy
Book Reviews
About Bill Gates
Continue
Confirm
Are you sure you want to
deactivate your account?
Deactivating your account will unsubscribe you from Gates Notes emails, and will remove your profile and account information from public view on the Gates Notes. Please allow for 24 hours for the deactivation to fully process. You can sign back in at any time to reactivate your account and restore its content.
Deactivate My Acccount
Go Back
Your Gates Notes account has been deactivated.
Come back anytime.
Welcome back
In order to unsubscribe you will need to sign-in to your Gates Notes Insider account
Once signed in just go to your Account Settings page and set your subscription options as desired.
Sign In
Request account deletion
We’re sorry to see you go. Your request may take a few days to process; we want to double check things before hitting the big red button. Requesting an account deletion will permanently remove all of your profile content. If you’ve changed your mind about deleting your account, you can always hit cancel and deactivate instead.
Submit
Cancel
Thank You! Your request has been sent
Become a Gates Notes Insider for access to exclusive content and personalized reading suggestions
Sign up to receive occasional updates from the Gates Notes
Sign Up
Privacy Policy
It looks like you're using an older version of Internet Explorer which may not display all the features on this site. Upgrade Now » close
WC: Winners' Circle

And the Winners of the Reinvent the Toilet Challenge Awards are…?

A year ago, the foundation launched an initiative to tackle the problem of sanitation in the developing world. We called it the Reinvent the Toilet Challenge. In this photo gallery you can learn more about each of the grantees and their sanitation solutions.

This week in Seattle, the foundation is holding a Reinvent the Toilet Fair. Today I awarded prizes to three universities who responded to our challenge a year ago to come up with solutions for capturing and processing human waste and transforming it into useful resources. The winners included: first place to California Institute of Technology in the United States for designing a solar-powered toilet that generates hydrogen and electricity, second place to Loughborough University in the United Kingdom for a toilet that produces biological charcoal, minerals, and clean water, and third place to University of Toronto in Canada for a toilet that sanitizes feces and urine and recovers resources and clean water. A special recognition was awarded to Eawag (Swiss Federal Institute of Aquatic Science and Technology) and EOOS for their outstanding design of a toilet user-interface.

A solar-powered toilet that generates hydrogen and electricity
California Institute of Technology, USA
A self-contained, solar-powered toilet and wastewater treatment system. A solar panel will produce enough power for an electrochemical reactor that is designed to break down water and human waste into hydrogen gas. The gas can then be stored for use in hydrogen fuel cells to provide a backup energy source for nighttime operation or use under low-sunlight conditions.

A solar-powered toilet that generates hydrogen and electricity

A sanitation system that converts human waste into biological charcoal
Participating organizations: Stanford University and the Climate Foundation, USA
A self-contained system that pyrolyzes (decomposes at high temperatures without oxygen) human waste into biological charcoal (biochar). After the fair, the system will be shipped to Nairobi to process two tons of human waste daily, at a facility located in the slums.

A sanitation system that converts human waste into biological charcoal

A toilet that converts human waste to fuel gas
Delft University of Technology, The Netherlands
A toilet system that applies microwave technology to transform human waste into electricity. The waste will be gasified using a microwave-induced plasma. This process will yield synthesis gas (syngas), a mixture of carbon monoxide and hydrogen. The syngas will then be fed to a solid oxide fuel-cell to generate electricity.

A toilet that converts human waste to fuel gas

Diversion for safe sanitation
Participating organizations: Eawag: Swiss Federal Institute of Aquatic Science and Technology; EOOS, Switzerland
A functional model of a urine-diverting toilet that recovers water for flushing. The urine and feces will be safely transported to a decentralized processing center. The water used for cleaning will be recycled by a gravity-driven biological membrane.

Diversion for safe sanitation

A toilet that produces biological charcoal, minerals, and clean water
Loughborough University, United Kingdom
A toilet that transforms feces into a biological charcoal (biochar) through hydrothermal carbonization (decomposition at high temperatures without oxygen and in water) of fecal sludge. The proposed system will be powered from heat generated by combusting the produced biochar and will be designed to recover water and salts from feces and urine.

A toilet that produces biological charcoal, minerals, and clean water

A urine-diverting combustion toilet
National University of Singapore, Singapore
A toilet that uses biological charcoal (biochar) to dry and combust feces. The heat generated will be used to extract water from urine by boiling it under pressure. The system can be fitted with activated carbon and exchange resin to recover highly purified water.

A urine-diverting combustion toilet

A community bathroom block that recovers clean water, nutrients, and energy
University of Kwazulu-Natal, South Africa
A toilet system that can safely dispose of pollutants and recover materials such as water and carbon dioxide from urine in community bathroom blocks. The system will separate the urine from the feces and extrude the feces into thin strands for faster drying and stabilization.

A community bathroom block that recovers clean water, nutrients, and energy

A toilet that sanitizes feces and urine to recover resources and energy
University of Toronto, Canada
A technology for treating solid waste streams through mechanical dehydration and smoldering (low-temperature, flameless combustion) that will sanitize feces within 24 hours. Urine will be passed through a sand filter and disinfected with ultra-violet light.

A toilet that sanitizes feces and urine to recover resources and energy

Want to learn more?

Become a Gates Notes Insider for access to exclusive content and personalized reading suggestions

Read previous versions of the Annual Letter


Discussion
comments powered by Disqus