Lake restoration

Purification system for lakes and watercourses

Restoration of lakes and watercourses

As much as 20% of Sweden's surface is made up of various types of lakes, watercourses and wetlands. The number of lakes in the country alone, according to the definition "water bodies of at least 1 hectare", is around 95,000. Almost all Swedish lakes and watercourses are directly or indirectly affected by human activities in form of various pollution, eutrophication and acidification. Many water bodies do not achieve good ecological or chemical status according to the EU Water Framework Directive. The goal of restoration is to recreate a natural state that existed before human impact. Restoration of watercourses is done in collaboration with the local County Administrative Board and can be financed with grants.

Carex offers two systems for completely sludge-free biological purification of watercourses and lakes:

Our modular and expandable treatment plants that clean and recirculate the water to the water course after treatment. These work with completely biological processes and are especially suitable for sensitive environments where a high level of protection prevails. The plant leaves no sludge, requires minimal maintenance and the only component of the plant that requires an external power source is the pumps that circulate the water in the treatment plant.

Read more about the principle of treatment plants here.

Carex mud balls are placed on the bottom of the lake and then as the mud dissolves, they spread a liquid nutrient consisting of inoculated microbes. The microbes consist of photosynthetic bacteria, lactic acid bacteria and yeasts. These effectively break down the residual organic waste that leads to eutrophication in lakes and waterways. The clay balls are the size of tennis balls and can be ordered in smaller volumes for targeted actions or for larger projects during longer periods via subscription.

Fermented green waste products, organic cane sugar molasses and clay.
Living rhizosphere microbes:
Nitrogen and CO2-fixing photosynthetic bacteria:
Rhodopseudomonas palutris, Rhodospirillum rubrum
Lactic acid bacteria:
Lactobacillis plantarum, Lactobacillius casei, L. acidophilud, L. rhamnosus, L. lactis, Streococcus thermophilus, Lactococcus lactis
Saccharomyecs cervisiae, Lecconostoc pseudomesenteorides
Bifobacterium: B. animalis, B. lactis. B, longum