Typical application targets for our village-scale wastewater treatment plants include communities of 50–2000 people, hotels, expansions of existing wastewater treatment plants, and areas that are to be provided with decentralised treatment units.  A village-scale treatment plant is built from a number of compact modules depending on required cleaning capacity.

Village-scale wastewater treatment plants have a minimal space requirement.  The plants are supplied in pre-installed form in sea containers. Only the sedimentation tanks are buried in the ground. Alternatively, they can be installed in above-ground containers, when excavation is not possible. 

Incoming wastewater is collected into a sedimentation tank where solid matter and phosphorus is removed from the water through the use of a non-toxic chemical. After sedimentation the wastewater passes through three bioreactors.  Each reactor uses a task-specific strain of specialised bacteria attached on the carrier element surface to remove nitrogen and organic matter from the water. Dead bacteria are separated from the water and end up in the sludge tank. Downstream of the third reactor, the water passes through mechanical filters and returns to nature in a purified form.

A village-scale plant functions reliably and withstands high fluctuations in flow volume. This is because the bacteria are tightly fixed onto the carrier surface and cannot be flushed off with the passing water. In addition, the plant operation is unaffected by long-term shutdowns because the bacteria are sustained by the internal water circulation and so can survive even over the the winter time. 


Village cleaner brochure »

References
Kirkkonummi and Inko »