Herbst Umwelttechnik

Herbst Umweltechnik

The suction dredger process with mechanical sludge dewatering


If the introduction of nutrients and/or harmful substances causes the bottom of a body of water to be covered with a layer of digested sludge whose thickness precludes the self-regeneration of the water, these sediments should be removed from the water in a way which causes as little disturbance as possible.


Using the suction dredging method, the release of nutrients and harmful substances during the removal of the sediment is reduced to a fraction of that found with the traditional grab dredging process. In this way, partial overfertilisation of the water which would be contrary to the aim of sanitation can be prevented.


If no rinsing surfaces are available in the immediate vicinity of the water or if it is a matter of contaminated sediment, the sediment can be dewatered using a suction dredger which is connected to a mechanical dewatering plant. This results in the production of a compact, transportable filter cake which, depending on its composition, can immediately be recycled or removed. The filtrate water which results from the dewatering process undergoes chemicophysical treatment so that it can be safely returned to the water.



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