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FFV - wastewater

FFV collects wastewater in Fåborg Municipality and treats it at a central sewage treatment plant. Over time, several smaller plants have been closed and instead replaced with long pipelines with pumping stations to transport the wastewater to treatment. This has led to the formation of harmful hydrogen sulphide in the pipes. Time has been spent trying to resolve this issue using various chemical methods or with carbon filters. A lot of money has been invested but without any obvious effect.

A particular problem is the large fluctuations in hydrogen sulphide formation known as “peaks”, as high concentrations destroy odour filters, and must be evened out to achieve effective purification. This requires efficient monitoring and management of the plant’s biological processes


2,000-14,000 m3 wastewater/24h


8,5 million m3 biogas/year

Filter capacity

500 m3 air/hour

Filter solution dimensions

Pre-filter 2 x 2.5 m. biofilter incl. technical space: 2 x 3.5 m


Expected > 10 years

“The release of hydrogen sulphide from a pumping station was a long-standing challenge. There have been complaints about bad smells from unhappy neighbours, especially in the summer. We tried different ways to solve the problem, but it was first with the help of measurements and equipment from BBK that we found a solution. They fitted a pre-filter and a biofilter and these have removed the vast majority of odours. Once the plant is fully run in, we will certainly use it elsewhere. BBK were very responsive and flexible in solving our problems.”

Arne Hansen, Operations Manager, FFV Wastewater

Biofilters at the Fåborg pumping station were installed in 2020 and are a new model from BBK with modular biofilters for decentralised plants. This was the precursor to a major MUDP project which aimed to minimise environmental nuisance and costs from the formation of hydrogen sulphide in wastewater pipes. BBK’s role in the project is to scale down biofilters that can be used effectively in smaller systems in combination with Cloud-based management of biological processes.