Repurposing emissions to create clean energy

A starch factory in Thailand turns emissions from wastewater into biogas energy. 

Recently, we presented the Bac Lieu wind farm project in Vietnam, as one of many projects supported by the individual members of CHOOOSE. Another project in our portfolio repurposes emissions from wastewater to biogas energy.

Capturing biogas

In the Kalasin Province region, at the foot of the Phu Pan hills in Thailand, the growth and processing of Cassava starch play a huge part in the economy. However, these starch processing factories place a significant strain on the environment, requiring a high demand of water for washing the cassava, with pungent smelling methane emissions and high fossil fuel reliance.

The Bangna Biogas Project involves replacing the old cascading open anaerobic lagoon treatment system with a modern Upflow Anaerobic Sludge Blanket (UASB) reactor system. This allowed for biogas to be captured and used for power generation, which is then sold to the grid.

Improved air quality

Now, biogas from plant wastewater that would have previously been emitted into the atmosphere, is captured. As the plant is grid-connected, the electricity that is produced displaces the production of power from fossil fuel sources.

In addition, the treated wastewater can be recycled and used for cleaning the cassava, which saves many tonnes of fresh water each day. For the local community, the air quality has improved vastly, special training opportunities have been provided and several permanent jobs created to operate and maintain the biogas facilities.

Key facts:
  • 4,600 MWh of clean electricity generated on average yearly
  • 7 permanent jobs boost the local area
  • 20,000 tons of CO2 prevented from entering the atmosphere on average per year
The Bangna Biogas project work towards these Sustainable Development Goals: