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Content archived on 2024-05-29

Integrated Wastewater Treatment Process using Mesh Filter Modules for Direct Activated Sludge Separation

Objective

The challenges of removing contaminations from wastewater with maximum reliability and efficiency by using wastewater treatment processes, plants and systems are growing, offering good opportunities for new and advanced technologies. One such innovative wastewater treatment system is the membrane bioreactor, an activated sludge process, where the secondary settling tank is substituted by a membrane filtration unit. Membrane bioreactors become a highly attractive system where stringent standards have to be met and because of their small footprint. However, membrane bioreactors still need further improvement for a wider spread application. The main hindrances are high investments for membrane modules and high costs for membrane replacement as well as high operation costs due to increased energy demand. The innovation of this project is to overcome these drawbacks by substituting membranes by a cheaper filtration technique, offering higher flux rates at lower filter pressures.
As activated sludge appears in form of flocs, a coarser filter material can be used to separate activated sludge from treated wastewater. The retention of sludge flocs leads to the formation of a secondary layer on the mesh surface, which serves as the actual filter membrane. By this means, even smaller particles than suggested by the mesh size are retained. Because of its high pore size, the filter mesh resembles almost no filter resistance. Another principal problem of membranes is fouling. Persistent deposits can only be removed by intensive periodical cleaning with chemical agents. In the MESH system, the secondary layer is periodically removed and a fresh layer is built up. Thus, the problem of fouling can be largely avoided and less frequent and intensive cleaning is necessary. In summary this improvements results in an innovative wastewater treatment process featuring high effluent quality and plant reliability at low investments and low operational costs.

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Topic(s)

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Call for proposal

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FP6-2004-SME-COOP
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Funding Scheme

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COOPERATIVE -

Coordinator

UNIVERSITÄT FÜR BODENKULTUR WIEN
EU contribution
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Total cost

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Participants (7)

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