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    Illustration of green water

    Siltation & loss of seabed

    siltation, loss of seabed 1 1

    What you see

    The physical profile of your body of water is changing. The signs of siltation are obvious:

    • Loss of depth: The seabed is rising year after year. Areas once navigable or fishable are now exposed.
    • Soft and "bottomless" vase: A pole or oar sinks several tens of centimeters without encountering hard resistance.
    • Visible fermentations: Gas bubbles burst the surface (methane) in summer. When the bottom is stirred, the water turns black and gives off a characteristic rotten egg smell (Hydrogen Sulfide).
    • Emergence of islets: Mudflats or clumps of vegetation appear in the center of the body of water, modifying its banks.

    What this means

    Silting is not just an accumulation of dead leaves, it is the symptom of a suffocation of the bottom. TASO diagnoses here an Active Organic Sedimentation.

    The natural cycle of decomposition is disrupted:

    1. Anoxia (Lack of Oxygen): The bottom layer is deprived of oxygen. Aerobic bacteria die.
    2. Anaerobic Fermentation: A putrefactive bacterial flora takes over. Instead of mineralizing the matter (transforming it into inert gas and minerals), it stores it in the form of acidic and unstable sludge.
    3. The Nutrient Trap: This mud stores massive amounts of Phosphorus and Nitrogen, which are released into the water as soon as the temperature rises, feeding the algae.

    Conclusion: Your body of water is not emptying, it is suffocating. It is storing more organic matter than it is capable of digesting.

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    Why act now?

    Siltation is an exponential process (the more silt there is, the less oxygen there is, so the silt accumulates more quickly). Failure to act leads to:

    • Mechanical Dredging (Cost and Impact): If the silt becomes too dense or mineral, the only solution is mechanical dredging (excavators, trucks). This is an extremely costly operation (10x compared to biological), destructive to wildlife, and complex from a regulatory standpoint (sludge management).
    • The “Phosphorus Bomb”: A layer of anaerobic sludge acts as a reservoir of internal pollution. It will continue to feed cyanobacteria and filamentous algae for decades, even if you cut off external inputs.
    • Health and fish risk: Fermentation gases (H2S, NH4) produced by the mud are toxic to fish and benthic fauna.

    The TASO Solution
    Biological Dredging (Bio-Dredging)

    Before considering major construction projects, TASO proposes reactivating the lake’s natural treatment system. We convert the sludge into water and inert gas.

    1

    Mineral Stimulation (Chemical Tillage)

    First, the acidity must be neutralized and the sludge oxidized to make it “digestible” by bacteria.

    The action: The application of Nautex (Coccolithic Calcium Carbonate) penetrates the silt layer. It raises the pH and brings chemical oxygen to the heart of the sediment.

    The result: The mud oxidizes, changes color (from black to gray/brown) and becomes less compact.

    2

    Bioaugmentation (Digestion)

    We bring in a team of skilled workers.

    The action: Inoculation of specific bacteria selected for their ability to break down complex carbon chains (cellulose, leaves, droppings).

    The result: Organic matter is "eaten" and transformed into CO2 which is naturally evacuated. The volume of sludge physically decreases.

    3

    Oxygen Support (Ventilation)

    For these bacteria to work at full capacity, they need oxygen.

    The action: The installation of a bottom aeration system (Oxylake) is often essential to maintain the continuous digestion process.

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    Products
    & Related Solutions

    To reduce silt without using excavators:

    oxylake

    Oxylake

    Oxygenation solutions for ponds and bodies of water
    Learn more
    Biolimpid

    Biolimpid

    Biological sedimentation
    Learn more
    nautex

    Nautex

    the standard mineral treatment for all bodies of water
    Learn more

    Need a study?

    Each protocol is tailored to the initial assessment, the characteristics of the body of water, and its intended uses.

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