Microdyn Nadir GmbH

Wiesbaden, Germany

Microdyn Nadir GmbH

Wiesbaden, Germany
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Grant
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: NMP-2009-2.6-1 | Award Amount: 4.39M | Year: 2010

Membrane bioreactor (MBR) technology is regarded as key element of advanced wastewater reclamation and reuse schemes and can considerably contribute to sustainable water management. MBR technology is used for wastewater treatment and reuse in municipal, agricultural and a variety of industrial sectors in Europe and MENA. The market pull, in the context of this NMP call, is the increasing demand for clean water complying with the strict European and MENA regulations. The European growing MBR market is dominated by two suppliers from Canada and Japan. Although, the European scientific community is strong in R&D, its expertise remains fragmented and lacks organization and communication within Europe. Despite the fact that the technical feasibility of this technology has been demonstrated through a large number of small and large scale applications, membrane fouling is regarded as an important bottleneck for further development. It is the main limitation to faster development of this process, particularly when it leads to flux losses that cleaning cannot restore. The objective of the BioNexGen project is therefore to develop a new class of functional low fouling membranes for membrane bioreactor technology with high and constant water flux (25 l/m2/h) and high rejection of organic pollutants with low molecular weight (down to 300 Da). The consortium consisting of European and MENA partners will develop a novel single step NF MBR operated with low energy consumption due to less aeration needed (0.2 Nm3/m2/h). Small footprint, flexible design, and automated operation make it ideal for localized, decentralized wastewater treatment and recycling in the European and MENA countries. Successful delivery will have a major impact on the competitiveness of the SME partners in the project and the European and MENA MBR market. Furthermore it will significantly contribute to scientific and technological cooperation between European and MENA countries in the provision of safe water.


Krause S.,Microdyn Nadir GmbH | Zimmermann B.,Microdyn Nadir GmbH | Meyer-Blumenroth U.,Microdyn Nadir GmbH | Lamparter W.,Microdyn Nadir GmbH | And 2 more authors.
Water Science and Technology | Year: 2010

In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and treated water takes place by membrane filtration. Due to the small footprint and superior effluent quality, the number of membrane bioreactors used in wastewater treatment is rapidly increasing. A major challenge in this process is the fouling of the membranes which results in permeability decrease and the demand of chemical cleaning procedures. With the objective of a chemical-free process, the removal of the fouling layer by continuous physical abrasion was investigated. Therefore, particles (granules) were added to the activated sludge in order to realise a continuous abrasion of the fouling layer. During operation for more than 8 months, the membranes showed no decrease in permeability. Fluxes up to 40 L/(m2 h) were achieved. An online turbidity measurement was installed for the effluent control and showed no change during this test period. For comparison, a reference (standard MBR process without granules) was operated which demonstrated permeability loss at lower fluxes and required chemical cleaning. Altogether with this process an operation at higher fluxes and no use of cleaning chemicals will increase the cost efficiency of the MBR-process. © IWA Publishing 2010.


Siembida B.,TU Darmstadt | Cornel P.,TU Darmstadt | Krause S.,Microdyn Nadir GmbH | Zimmermann B.,Microdyn Nadir GmbH
Water Research | Year: 2010

The research on fouling reduction and permeability loss in membrane bioreactors (MBRs) was carried out at two MBR pilot plants with synthetic and real wastewater. On the one hand, the effect of mechanical cleaning with an abrasive granular material on the performance of a submerged MBR process was tested. Additionally, scanning electron microscopy (SEM) measurements and integrity tests were conducted to check whether the membrane material was damaged by the granulate.The results indicate that the fouling layer formation was significantly reduced by abrasion using the granular material. This technique allowed a long-term operation of more than 600 days at a flux up to 40 L/(m2 h) without chemical cleaning of the membranes. Moreover, it was demonstrated that the membrane bioreactor (MBR) with granulate could be operated with more than 20% higher flux compared to a conventional MBR operation. SEM images and integrity tests showed that in consequence of abrasive cleaning, the granular material left brush marks on the membrane surface, however, the membrane function was not affected.In a parallel experimental set up, the impact of the operationally defined " truly soluble fraction" <0.04 μm from wastewater and activated sludge on the ultrafiltration membrane fouling characteristics was investigated. It was shown that the permeability loss was caused predominantly by the colloidal fraction >0.04 μm rather than by the dissolved fraction of wastewater and activated sludge. © 2010 Elsevier Ltd.


Rosenberger S.,Osnabruck University of Applied Sciences | Helmus F.P.,Osnabruck University of Applied Sciences | Krause S.,MICRODYN NADIR GmbH | Bareth A.,MICRODYN NADIR GmbH | Meyer-Blumenroth U.,MICRODYN NADIR GmbH
Water Science and Technology | Year: 2011

Up to date, different physical and chemical cleaning protocols are necessary to limit membrane fouling in membrane bioreactors. This paper deals with a mechanical cleaning process, which aims at the avoidance of hypochlorite and other critical chemicals in MBR with submerged flat sheet modules. The process basically consists of the addition of plastic particles into the loop circulation within submerged membrane modules. Investigations of two pilot plants are presented: Pilot plant 1 is equipped with a 10 m 2 membrane module and operated with a translucent model suspension; pilot plant 2 is equipped with four 50 m 2 membrane modules and operated with pretreated sewage. Results of pilot plant 1 show that the establishment of a fluidised bed with regular particle distribution is possible for a variety of particles. Particles with maximum densities of 1.05 g/cm 3 and between 3 and 5 mm diameter form a stable fluidised bed almost regardless of activated sludge concentration, viscosity and reactor geometry. Particles with densities between 1.05 g/cm 3 and 1.2 g/cm 3 form a stable fluidised bed, if the velocity at the reactor bottom is sufficiently high. Activities within pilot plant 2 focused on plant optimisation and the development of an adequate particle retention system. © IWA Publishing 2011.


Thiemig C.,Microdyn Nadir GmbH
Water Science and Technology | Year: 2012

Sludge properties have a strong impact on the operational aspects of membrane bioreactors (MBRs). Poor sludge properties cause stronger membrane fouling and reduce the filtration performance of MBRs. Up to now there is no general method used to measure the fouling or filtration relevant sludge properties in MBRs. The aim of this work was to develop a simple but reliable method to supply operators a tool to monitor the important sludge properties for their application and to compare this method with existing techniques. Through extensive research a new method called the sludge filtration index (SFI) has been developed to indicate the appropriate sludge parameters for MBR systems in a cheap and easy manner. The SFI can be measured with simple laboratory equipment and offers operators a powerful tool to monitor the conditions of their sludge, independent of the membrane conditions. © IWA Publishing 2012.


Patent
Microdyn Nadir Gmbh | Date: 2011-04-28

A device for micro-, ultra-, or nanofiltration that includes one or more flat filter modules having flat filter elements arranged in parallel and at a distance from each other and gas injectors of one or more gas lifting systems for producing a circulating cross flow directed tangentially to the surface of the flat filter elements and having at least one rising area, in which the cross flow flows substantially vertically upward, and at least one falling area, in which the cross flow flows substantially vertically downward, in which the rising area flows through 10 to 100% and the falling area flows through 10 to 100% of an inlet-flow volume of the at least one flat filter module.


PubMed | Microdyn Nadir GmbH
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2012

Sludge properties have a strong impact on the operational aspects of membrane bioreactors (MBRs). Poor sludge properties cause stronger membrane fouling and reduce the filtration performance of MBRs. Up to now there is no general method used to measure the fouling or filtration relevant sludge properties in MBRs. The aim of this work was to develop a simple but reliable method to supply operators a tool to monitor the important sludge properties for their application and to compare this method with existing techniques. Through extensive research a new method called the sludge filtration index (SFI) has been developed to indicate the appropriate sludge parameters for MBR systems in a cheap and easy manner. The SFI can be measured with simple laboratory equipment and offers operators a powerful tool to monitor the conditions of their sludge, independent of the membrane conditions.

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