BFB – Wastewater Treatment

Price: 32.50 $ /tonne

  • Location: Thailand
  • Project Type: Energy Efficiency
  • Certification: Gold Standard

Only a few years ago, the inhabitants of the surrounding villages could smell the open lagoons used for clearing the starch wastewater. Today, not only the local air and water quality has improved significantly, at the same time the starch plant managed to reduce its fossil fuel use by as much as 4700 litres per day thanks to the capture of methane from wastewater treatment and its combustion to generate energy. In addition, the project and the resulting carbon revenues generated jobs for locals and support social and educational activities in the community to enable sustainable development.

Technically, the project activity involves the installation of two closed anaerobic wastewater treatment facilities (Upflow Anaerobic Sludge Blanket technology) at a starch manufacturing plant with a large output of wastewater. Before the installation of the project, the wastewater in the plant was treated through cascading open lagoons with a retention time of more than a year. The mix of the lagoon size, atmospheric and water temperature, resulted in an anaerobic environment in the ponds. These conditions led to methane generation from the organic content of the wastewater which was steadily released into the atmosphere. Methane is a greenhouse gas 21 times stronger than CO₂.

Now, the captured methane can be used for clean energy production in two burners on the plant site, replacing fossil fuel for heat generation to dry the starch. Thus, the emission reduction project has a double effect, keeping methane from heating up our climate and at the same time avoiding the burning of thousands of tons of fossil fuel per year.