Stopped algal blooms in Nynäshamn. Saved the fish in Lidingö. We restore the biological system that lets water clean itself, adapted to Nordic conditions.
When oxygen disappears from the bottom layer, sediments begin leaking nutrients back into the water. This drives algal blooms and disrupts the entire ecosystem. Traditional methods often treat the symptom, not the cause.
Eutrophication leads to green water, reduced visibility and foul-smelling sulphur compounds. A burden on bathing waters and recreational areas.
Thick ice and heavy biological load cause acute oxygen failure. Risk of mass fish death, especially in smaller water bodies during winter.
Accumulated phosphorus and organic material leak back from the bottom for years. The lake "falls back" even after costly external interventions.
The method does not rely on a single measure. We gradually restore the processes that allow a lake to function as a natural treatment system.
A root-cause analysis of loading, sediment and ecology. Reveals which measures actually work for your specific water body.
Containment booms limit the spread of particles and nutrients, and delineate treatment zones at the inlet.
Biosurfaces and bioreactors create large surfaces where microorganisms form biofilms that break down organic material.
Selected microorganisms strengthen the lake's biological treatment processes and stabilise decomposition in water and sediment.
Stabilises water chemistry, reduces phosphorus leakage from the sediment and lays the foundation for effective biological decomposition.
Continuous analyses of water quality and ecology ensure that the restoration leads to a stable and long-term healthy ecosystem.
The flow leads the water through the system. The bioreactor is where the treatment takes place. The biology does the work. The oxygen keeps the process stable.
In less than a year, two heavily loaded fishing lakes near Hvide Sande were markedly improved through biological restoration with microorganisms, a bioreactor and aeration.
At a food-industry treatment plant, chemical inhibition knocked out the biological treatment and sludge escaped into the clarification pond. With emergency biological reinforcement and a bioreactor, the ammonium level fell from 15–17 mg/L to 0.2 mg/L.
When oxygen fails or the ecosystem collapses, the time window is short. Here are two examples where rapid, targeted measures made the difference.
Svandammen suffered acute oxygen depletion. The result was murky water, algal blooms and a strong sulphur smell. Two aerators from Eden Aquatech broke the anaerobic process, the smell disappeared, and the water regained its clarity.
It is a pure joy to see all the happy birds in Svandammen now. The municipality has done exemplary work in oxygenating the pond.Read the full project description
When Lake Ekholmsnässjön suffered acute oxygen depletion under the February ice, there was critical risk of mass fish death. Rapid deployment of airTURBO RV2, developed for the Nordic climate, supplied oxygen directly into the water masses and turned the situation around before the ecosystem collapsed.
It draws in a large volume of air, roughly one cubic metre per second, and mixes it with the oxygen-depleted water.Les hele prosjektbeskrivelsen
Click to expand. Here you will find technical details about the method, the risks of traditional measures and strategies for larger water bodies.
Dredging is often considered the standard solution for sediment accumulation, but for larger water environments the method carries significant risk:
Instead we use in situ microbial decomposition which stabilises the sediments without disturbing the ecosystem.
A common misconception is that biological restoration requires treatment of the entire water volume. For larger water bodies this is rarely the most rational approach.
We work according to the principle of strategic point treatment, where powerful measures are placed where they do the most good: at the lake's inlets and loading points. A "biological lock" at the main inlet treats water continuously before it spreads into the larger water mass.
In lakes where the sediment is already saturated with phosphorus, we use an integrated strategy:
The combination ensures that the lake does not "fall back" into internal loading when a chemical effect fades.
Every project starts with a pre-analysis, a root-cause mapping of loading, sediment chemistry and ecology for your specific water body. The result is a treatment plan with concrete, measurable result indicators.
During restoration, parameters such as visibility, oxygen level, phosphorus, nitrogen and biodiversity are monitored through continuous sampling. You receive documentation you can share with political leadership, water authorities and residents.
We offer a free initial assessment of the municipality's priority lakes or ponds. Send us a brief note about the challenge, and we will arrange a meeting.
