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Siltation & Seabed Restoration

Sedimentation is one of the most underestimated factors in the degradation of water bodies. Initially invisible on the surface, it nevertheless acts as a major brake on the proper functioning of the environment.

Loss of effective depth,
smells of fermentation,
persistent cloudy water,
nutrient release,
drop in dissolved oxygen

Silt gradually turns a body of water into an unstable system that is costly to maintain and difficult to manage.

For managers, silting is not just a volume problem. It is a structural problem, which directly affects water quality, biodiversity, and the sustainability of its uses.

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Understanding
the imbalance

The mud consists largely of organic matter: fallen leaves, plant debris, decomposed algae, and animal waste. In a healthy body of water, this material is gradually broken down by aerobic bacteria present in the sediment.

When the inflow becomes too high or oxygen levels drop too low at the bottom, this mechanism breaks down.
The sediment then shifts to anaerobic conditions.

Under these conditions, biological digestion stops. The organic matter ferments, produces toxic gases (methane, hydrogen sulfide), consumes available oxygen, and releases phosphorus back into the water. The sludge ceases to be a simple deposit: it becomes an active source of internal pollution.

Why do traditional solutions
fail

When faced with silting, the standard response is to take mechanical action.

Dredging does indeed restore depth temporarily, but at the cost of a major operation: partial or total draining, heavy machinery, destruction of the banks, complex management of the extracted sediment, and very high costs. Above all, it does not address the biological causes of siltation. Without addressing the sediment’s behavior, the silt will build up again.
Other methods rely on harsh chemical treatments, such as quicklime. While the visual effect is immediate, these practices sterilize the ecosystem at the bottom. The sediment loses its natural ability to self-purify and becomes even more vulnerable to future organic inputs.

The answer
taso

The TASO approach is based on a simple principle: reactivating the biological balance of the body of water, rather than extracting or neutralizing it.

We intervene directly in the body of water, without heavy work, to restore the conditions necessary for the natural degradation of organic matter. The objective is not to move the silt, but to gradually transform it, reducing its volume and its harmfulness.

This strategy, known as bio-dredging or in situ bioremediation, is part of an approach to sustainable and controlled restoration.

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Our technologies
& products used

The restoration of funds relies on a precise combination of levers, adapted to each site configuration.

Mineral stabilization of sediments

Mineral conditioning with NAUTEX stabilizes sediment. By correcting the pH and modifying the silt structure, it improves the bottom's permeability and promotes the gas exchange essential for bacterial life.

Nautex (powder)
the standard mineral treatment for all bodies of water

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Biological sludge digestion

The solution Biolimpid provides micro-organisms selected for their ability to digest organic matter. These bacteria restart sludge mineralization and progressively reduce the thickness of active sludge.

Biolimpid
Biological sedimentation

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Active bottom aeration

OXYLAKE bottom aeration plays a key role. By supplying oxygen directly to the water-sediment interface, it removes the main limiting factor for biological digestion and prevents the return of anaerobiosis.

Oxylake
Targeted oxygenation for small to medium-sized bodies of water

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This is not a one-off treatment, but a management of the fund's operations.

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Benefits
for the manager

This approach allows work to proceed without interrupting the site's operations. The water body remains filled with water, accessible, and fully functional throughout the treatment process.

Odor problems are quickly eliminated, the water column clears up, and the environment’s self-purification capacity is restored. In the long term, the reduction in sediment limits the release of nutrients and reduces the risk of algal blooms.

For the manager, this is an economically sound solution that is environmentally responsible and consistent with the sustainable management of aquatic resources.

The answer
to your questions

Can all bodies of water benefit from bio-dredging?

Bio-dredging is particularly effective on sediment rich in organic matter. A preliminary analysis helps distinguish organic sediment from mineral sediment (sand, clay), which is non-biodegradable. This step determines the suitability of the solution.

Does bio-dredging permanently replace mechanical dredging?

In many cases, yes. When the body of water has not completely silted up, bioremediation can prevent or significantly delay the need for dredging. In cases of advanced siltation, it becomes an essential maintenance tool following mechanical intervention.

Is there a risk that bottom aeration will resuspend the silt?

No. TASO systems are designed to oxygenate the water without disturbing the sediment. On the contrary, they promote the settling and stabilization of fine particles.

Sediment management
cannot be improvised.

An accurate assessment of the nature of the sediment is essential to avoid costly and ineffective interventions.
TASO’s experts will work with you to analyze your seabed and develop a restoration strategy tailored to your technical and budgetary needs.

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Siltation & Seabed Restoration

Understanding
the imbalance

Why do traditional solutions
fail

The answer
taso