Sol-char toilet: Using concentrated solar energy to stabilize fecal waste and produce a valuable soil amendment - Various documents on results from research grant

Linden, K. (2013)

Published in: 2013

Publisher:
University of Colorado, Boulder, USA

Author:
Linden, K.

Uploaded by:
SuSanA secretariat


7057 Views
523 Downloads

Content - Summary

This library entry contains background documents for a grant that Karl Linden is leading and which is funded by the Bill and Melinda Gates Foundation.

Further information and a discussion is available on the SuSanA discussion Forum, see link below.

Project Description:
Last September, our team here at the University of Colorado, Boulder took on the BMGF challenge to reinvent the toilet with a novel approach that utilizes concentrated solar energy to safely and efficiently char fecal waste without the need for intensive pre-drying.

As a quick overview, our toilet – the Sol-Char Toilet – is a waterless, self-contained toilet that functions off-the-grid. Concentrated sunlight is delivered to fiber optic bundles located at the focus of parabolic concentrators (see Concept Sketch). The fiber optic cables are fed to the reaction compartment of the Sol-Char where the various individual cables are terminated at an outer or “solar” lid positioned over the waste collection container. The innovative transmission of concentrated solar power illuminates the inner collection container and disinfects the waste though conduction, convection, and radiation heat transfer. The reaction compartment comprises two or more containers that are alternated between “collection” and “reaction” modes via a simple carousel system that can be automated (powered with photovoltaic energy) or manually controlled. The reactor is designed to achieve high temperatures (300oC to 750oC) and produces a safe and useable product.

Research Goal:
Our goal during this phase 1 of research is to develop a functioning toilet prototype that will provide a scientific basis for utilizing concentrated solar energy to safely disinfect and transform human waste into valuable end products (such as char for agricultural soil application).

On-going research activities include:
• Solar collection and transmission optimization
• Reactor modeling and fabrication
• Char product evaluation and testing
o Hydrothermal carbonization (HTC) and dry pyrolysis chars will be compared
o Dry pyrolysis will also be evaluated with mixed waste and urine diversion to determine the best utilization of nutrients
o Adsorption studies will be conducted in the liquid and gas phase to determine if the char can be further enriched with NPK
• Means for odor control, gas utilization, and final product storage
• User interface and safety features
Our prototype development is underway and we are excited to further advance this technology. We welcome your feedback and comments!

Further authors: Linden, K. G., Summers, R. S., Weimer, A., Lewandowski, A., Klees, R., Oversby, C., Mahoney, R., Yacob, T., Fisher, R., Mejic, D., Kearns, J., Beck, S., Shimabuku, K.

+++++++++++
Documents available for download below:

1 - Solar biochar toilet (presentation at FSM2 Conference in Durban, South Africa, Oct. 2012)

2 - Solar biochar toilet (paper at FSM2 Conference in Durban, South Africa, Oct. 2012)

3 - Short presentation on biochar toilet at webinar, by Chip Fisher and Ryan Mahony (Nov. 2013)

4 - Applications of concentrated solar-energy in innovative sanitation solutions (presentation at FSM3 Conference in Hanoi, Vietnam, Jan. 2015)

Bibliographic information

Linden, K. (2013). Sol-char toilet: Using concentrated solar energy to stabilize fecal waste and produce a valuable soil amendment - Various documents on results from research grant. University of Colorado, Boulder, USA

Filter tags

English Fundamental research and engineering North America

Information on external sites

Download

1 - Solar biochar toilet (presentation at FSM2 Conference in Durban, South Africa, Oct. 2012)

Format: pdf file
Size: 2.18 MB

2 - Solar Biochar Toilet (paper at the FSM2 Conference in Durban, South Africa, Oct. 2012)

Format: pdf file
Size: 0.3 MB

3 - Short presentation on biochar toilet at webinar, by Chip Fisher and Ryan Mahony (Nov. 2013)

Format: pdf file
Size: 2.36 MB

4 - Applications of concentrated solar-energy in innovative sanitation solutions (presentation at FSM3 Conference in Hanoi, Vietnam, Jan. 2015)

Format: pdf file
Size: 2.64 MB

Share this page on    


Follow us on    

SuSanA Partners  currently 352 partners

Sanitation events

SuSanA newsletter

Stay informed about the activities of SuSanA and its partners. The SuSanA newsletter is sent out around four times per year. It contains information about news, events, new partners, projects, discussions and publications of the SuSanA network.

Subscribe to newsletter »

Latest tweets mentioning SuSanA

Tweets mentioning SuSanA »

28th SuSanA meeting, Stockholm

The previous SuSanA meeting took place in Stockholm, Sweden, in conjunction with the World Water Week 2019.

Find the meeting documentation here! 

SuSanA meetings

Jobs

 


close  

 

Resources and publications

Our library has more than 3,000 publications, factsheets, presentations, drawings etc. from many different organisations. It continues to grow thanks to the contributions from our partners.

Add item to library »

The three links below take you to special groups of items in the library for more convenient access:

Projects

The project database contains nearly 400 sanitation projects of many different organizations dealing with research, implementation, advocacy, capacity development etc. Advanced filtering functions and a global map are also available. Information on how and why this database was created is here.

People working for SuSanA partners can add their own projects through their partner profile page. You might need your SuSanA login upgraded for this purpose. Please contact us if you would like to add a project.


Trainings, conference and events materials

Missed important conferences or courses? Catch up by using their materials for self study. These materials have been kindly provided by SuSanA partners.

Regional chapters

Use the map or the search tool to access the most relevant information and knowledge products for your region or country. This includes relevant resources, events, partners or projects.

Shit flow diagrams (SFDs), excreta flow diagrams

Shit flow diagrams (SFDs) help to visualize excreta management in urban settings. Access SFDs and more through the SFD Portal.

 


close  

 

Discussion forum

Share knowledge, exchange experiences, discuss challenges, make announcements, ask questions and more. Hint: Your discussion forum login is the same as your SuSanA login. More about the forum's philosophy »


Integrated content

We are hosting content from some other communities of practice and information-sharing portals. This section also provides a link to SuSanA's Sanitation Wikipedia initiative.

Suggest content to add »

SuSanA partners

Not yet a SuSanA partner? Show your organisation's support to SuSanA's vision and engage in  knowledge sharing by becoming partners.

Apply to become a partner »


Individual membership

Register as an individual member of SuSanA free of charge. As a member you can interact with thousands of sanitation enthusiasts on the discussion forum.  You can also get engaged in one of our 13 working groups and our regional chapters. Our FAQs explain the benefits further.

By getting a SuSanA login you can fully participate in the SuSanA community!

Register as a member

Login


Forgot your password?

 


close