Sustainable decentralized wastewater management in developing countries: design, operation, and monitoring

2011 - 2017 • Asian Institute of Technology (AIT)


Reinventing innovative decentralized systems and technologies for full or partial treatment, and disposal of human excreta and wastewater from dwellings and businesses in Thailand, Cambodia and Vietnam.


The project seeks to reinvent technologies for decentralized wastewater management that is Naturally Acceptable and Technological Sustainable (NATS). The project focuses on innovation in decentralized systems and technologies using a market-led approach for full or partial treatment and disposal of human excreta and wastewater from dwellings and businesses.

Targets: The project has quantifiable targets, which includes among others development of thermal septic tank, microwave and microbial fuel cell, nano-disinfection and solid-liquid separation devices. Besides, technology identification of odor-free and pathogen-free effluent, with a 50 per cent reduction of fecal sludge, and production of ready-to-reuse market-friendly products is the other main target. Other targets include peer-reviewed publications, and identification of market factor, market and technology landscape analysis, identification of target buys, analysis of unmet needs and compilation of dataset of performance of existing systems.

Countries of activity

Location of main activity


1. Invention and prototyping of Decentralized Wastewater Treatment Systems (DEWATS) technology that treats and discharges a pathogen-free domestic effluent, and ready for reuse products.
2. Field testing of prototype technologies for single families and apartment blocks or for community wastewater management.
3. Securing commercial ventures with industries for mass production and commercialization.
4. Increase regional academic expertise in innovative DEWATS technologies.

Further information

Research or implementation partners: Thammasat University, Ho Chi Minh City University of Technology, and Ramkhamhaeng University.

One of the project components was the "Solar septic tank and hydro-cyclone toilet". See the link to the discussion forum thread below for more information on this hydrocyclone system.

Filter tags

Asia & Pacific Bill & Melinda Gates Foundation Decentralised wastewater treatment (e.g. DEWATS) Market development Operation, maintenance and sustainable services Product design and engineering Specific to one or several countries Technology comparisons Treatment of wastewater or greywater University, education or research institution


Asian Institute of Technology
Pathum Thani

The Asian Institute of Technology (AIT) is an international postgraduate institute of higher education based in Thailand. Established in 1959 as the first postgraduate school in the region, it boasts of over 21,000 alumni in 101 countries and territories. Ranked world's Number "1" in international orientation (by UMultirank), AIT works with nearly 200 partners all over the world.

view profile page

Uploaded by:
Trevor Surridge (tmsinnovation)

Share this page on    

Follow us on    

SuSanA Partners  currently 362 partners

Show all 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

  • 04-03-2021 19:01aguatuya:
    RT @fsm_alliance: We spoke to SCG Chemicals, @ihedelft , @susana_org and @aguatuya about why they've chosen to exhibit virtually this year… »
  • 04-03-2021 13:00SuSanA:
    Would you like to know about upcoming events relating to sanitation?🗣 Given this week's theme on #FSM💩♻️, you can… »
  • 04-03-2021 12:04SuSanA:
    Agreed- common terms are important! Any #Wikipedia enthusiasts who took a look at the title👀🤓… »
  • 04-03-2021 11:52SuSanA:
    RT @GIZWatSSUP: WatSSUP is implementing long-term COVID-19 preventive measures focusing on sustainable technologies for handwashing. One of… »
  • 04-03-2021 11:52SuSanA:
    RT @GIZWatSSUP: Today is the first day of our #WASHaLOTWednesday feature! Every Wednesday, for the next few months, we will share the story… »
  • 03-03-2021 18:38FSMA:
    We spoke to SCG Chemicals, @ihedelft , @susana_org and @aguatuya about why they've chosen to exhibit virtually this… »

Tweets mentioning SuSanA »

30th SuSanA meeting

The 30th SuSanA meeting - the first virtual of its kind - took place from August 17th to August 28th 2020. It was organised by the SuSana Secretariat with support and contributions from SuSanA Partners, Members, Working Groups and Regional Chapters.

Click here to get to the Meeting Page!

SuSanA meetings





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:


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.




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


Forgot your password?