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Nakhon Biogas

Generating sustainable electricity from wastewater biogas


Cassava starch is a large industry in Thailand, but its production produces large amounts of wastewater. When stored in large open lagoons, this wastewater emits methane into the atmosphere; a greenhouse gas 21 times more potent than CO2.

Wastewater treatment
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Sustainable Development Goals

6. Clean Water and Sanitation

850,000 m3 of water

treated each year on average, providing a clean recycled water resource to farmers

7. Affordable and Clean Energy

1,600 MWh

generated each year on average, providing an alternative to the burning of fossil fuels

8. Decent work and economic growth

11 permanent jobs

created, boosting local economies with new income streams

13. Climate Action

97,000 tonnes of CO2e

avoided each year on average by capturing emissions and displacing fossil fuels

The Solution

Prior to this project, wastewater was treated through cascading open lagoons. This process resulted in the steady release of methane into the atmosphere. This project installed a closed lagoon anaerobic system that captures methane gas emissions, and uses them to generate clean energy. This not only avoids the emission of potent greenhouse gases, but displaces energy sourced from the burning of fossil fuels.

The cassava starch, also called tapioca, is used for food, animal feed, and industrial purposes.


Using methane from wastewater generates electricity and avoids burning thousands of tonnes of fossil fuels


The Impact

The project has significantly improved local air and water quality. At the same time, the fossil fuel use of the starch plant has been significantly reduced. The project and the carbon revenue it generates provides jobs for locals and supports social and educational activities. The clean wastewater is used to irrigate nearby fields and allows fish farming, enabling local communities to increase their income.

Project ID: 300059