Zech Umwelt GmbH

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Urban Wastewater Treatment

Membrane bioreactors are used for urban wastewater treatment. These plants are based on the well-proven activated sludge biology process, which is used in almost all small- and large-sized wastewater treatment plants. The activated sludge process is responsible for the degradation of organic substances and for the reduction of the nutrient substances nitrogen and phosphor. The basic difference between membrane bioreactors and conventional activated sludge wastewater treatment plants is that the membrane stage is used as a substitute for the conventional final sedimentation stage (sedimentation tank).

The membrane stage provides, on the one hand, for a more compact structure and, on the other hand, if offers far more applications possibilities for wastewater re-use. In addition, it secures full compliance with the EU bathing water directive due to secured retention of bacteria and viruses.

Already existing conventional wastewater treatment plants may also be easily extended in their capacity by means of membrane technology. To do so, the final sedimentation tanks are, for instance, transformed into activated sludge tanks and equipped with membrane modules. This specific variant is particularly appropriate for those plants with only limited additional space available.

In case of existing conventional plants, the use of Ultrafiltration in the wastewater plant’s discharge structure allows the re-use of the treated wastewater and, once again, the guaranteed compliance with the EU bathing water directive, without having to actually modify the proper treatment process in the plant.