SDT is the first process in the world applying also in practice the electro-osmotic process during the dehydration of different sludges in order to reach a higher percentage of dry substance. The costs of transportation and disposal of the dehydrated sludge can be significantly reduced by this process. SDT leads in both communal and industrial sewage sludges, to a rather high dry substance content. In certain cases the dry substance content of sludges (e.g. sludges from paper industry, dairy industry, communal sewage, oil industry) can reach even 50-66 percent. The precondition of the electro-osmotic process for dehydrating sludges can be implemented in case of a 21 % or higher weight percentage of the dry substance content of the sludge.

Principle of the SDT dehydrating process

theory-300x266In contrast to the traditional sludge dehydrating processes SDT is based completely on new ideas of dehydration of sewage sludges. Water content can be extracted from the sludge by electrophoresis and electro-osmosis with high efficiency. During the process, the previously partly dehydrated sludge, after being moved between the anode, operating as a rotating drum and the cathode, being similar to a caterpillar, looses the great part of its water content including the pore water as well as the water absorbed in the capillaries and the water absorbed in cells (called activated sludge). The standard SDT sludge dehydrating system can be installed together with a belt filter presser or only as a separate unit, depending on if a new dehydrating technology is established or the efficiency of the old machines need to be improved. For these reasons two versions of SDT can be ordered and in six different sizes in both versions.

SDTS – independent SDT

This dehydrating machine applies the electro-osmotic process. It alters the sewage sludges, treated by conventional dehydrating machines, in order to have a higher dry substance content and a reduced volume. It can be easily connected to any kind of already operating conventional dehydrating equipment, which can be either a belt presser or a centrifuge. Before letting the sludge enter the SDTS machine, dry substance content has to be reduced at least to 21%.

SDTB – SDT integrated with a belt presser

A group of dehydrating machines with high efficiency, which involves both dehydrating processes: belt presser and electro-osmosis. This is the only machine with high cost efficiency, which ensures a high dry substance content of the treated sludge. In contrast to the conventional dehydrating machines it decreases significantly the water content and the volume of the treated sludge, and reaches a high dry substance content, more than 50%. SDTB is a compact machine, which has a high dehydrating efficiency, with low noise load as well as low maintenance costs, and it can be applied even in facilities with a small number of workers.


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