Tertiary / Advanced Treatment
Since the spring of 2018, the first municipal Flexbed filter system has been running as part of a 4. Purification stage for the reduction of trace substances and for the elimination of phosphorus at the treatment plant Barntrup (NRW).
The plant consists essentially of a contact basin, in which powdered activated carbon adsorbs the trace substances. The loaded activated carbon is combined with precipitated phosphorus in 4 downstream, high-efficiency Flexbed filters, which are designed for a full flow treatment, effectively removed from the waste water (12,400 PE, 160 l / s, 4 filters, total filter surface 16 m²).
Landfill Seepage Treatment (left)
Heavy Metal Removal (below)
The pink balls made of synthetic fibers are responsible for the high performance of the Flexbed Filter™. With its compressible filter medium the filter provides variable porosity and high grade contaminant uptake at filtration rates up to 100 m³/m²/h. Particle sizes between 5 microns to several millimeters can be removed effectively from water and wastewater without risk of clogging. Individual adaptation to any filtration task is possible through freely selectable compression of the filter bed. Neither filtrate still fresh water is needed for the backwash.
Flexbed Filter™ installations have a modular design and are available in different sizes and standard versions. They can be used in a very space efficient, universal and flexible way. Furthermore they provide the option of expansion and upgrade.
The synthetic filter material of the Flexbed Filter™ is permeabel in contrast to conventional filtering techniques with mineral filter material. The particle-containing water flows through both the pore space between the filter elements and the outer areas of Flexbed balls themselves. The porosity of the entire filter bed grows over 90 % by using the additional space within the filter balls.
This means in effect, compared to conventional filter materials, a doubling of the available pore space and thus a higher expected loading capacity up to 16 kg DM / m³, while conventional depth filters (without flocculation) can take up max. 4.0 kg DM / m³. For simple (flat) sand filter systems even only 1.0 to 1.5 kg DM / m³ are accepted for assessment.
Due to the compressibility of the filter material and hence variability of pore sizes in the filter bed, an optimization of the filtration process and flexible adaptation to different raw water qualities of the inlet and particle sizes can be accomplished without structural modifications need to be made to the filter itself.
The combination of the above-mentioned characteristics allows efficient particle separation with high filter speeds up to 100 m/h and minimal space requirements.
Another advantage of the Flexbed Filter™ technology is, that the backwash doesn’t need fresh water or filtrate, but only a small raw water flow is required in addition to compressed air. Thus savings arise from both lower construction costs (no filtrate storage tank required) and lower operating costs in comparison to conventional filtering techniques.
If you are interested in our Flexbed Filter™ we will visit your company. After analyzing your specific problem and the conditions we will present potential solutions including the Flexbed Filter™ technology.
With our mobile test container you can easily aquire first experiences by setting up the Flexbed filter in your environment. The test-Flexbed Filter™ (size type 1, maximum capacity 20 m3/h) is housed in a 20-foot container. The latter also includes all necessary equipment for operation like feed pump, blower to produce the compressed air for backwashing, measuring equipment, sampling points and touchscreen controlled PLC. The evaluation of the recorded operating data of the filter in combination with the results of turbidity measurement and analysis already enable reliable predetermination of the design parameters for your future Flexbed Filter™.
After a detailed onsite analysis (and possible evaluation of test results), we dimension and plan your future Flexbed Filter™. If necessary, we would get support from the experienced engineers and technicians of our Dutch parent company. Together we create a tailor-made solution for you, which we discuss and match with your wishes.
As part of the construction work both the production of components and assembly of the Flexbed Filter™, as well as the delivery and installation on site is carried out. All necessary settings for a reliable start of the plant are made and documented.
With an in-depth training of your operating personnel in the handling of Flexbed Filter™ we ensure that a smooth operation and integration of your new Flexbed Filter™ system is guaranteed.
We do not only offer high-performance technology to our customers. We are also interested that you feel well looked after and consulted even after commissioning. Therefore we offer regular service visits for inspection and maintenance of the filter and to provide advice.
Service and maintenance contracts tailored to your plant guarantee the longevity of the Flexbed Filter, minimize costly system failures and improve operational reliability. We are happy to come around regularly and inform you about further developments and product improvements.
For temporary filtration tasks or to support existing filtration solutions during an overload, we have Flexbed Filter™ units for rent. The filtration capacity of the different Flexbed Filter™ module sizes covers flow rates from 6 up to 600 m³/h. An extension of the filtration capacity is possible at any time by adding additional modules, even during the rental period. The high filtration speed of up to 100 m³/m²/h allows an extremely space-saving and therefore easily integratable structure. Since the necessary technical equipment is already installed, the filtration units are ready for operation after delivery by truck. In addition, through the variable porosity of the filter medium an adaptation to different water qualities is uncomplicated; even during operation via the optional remote control.
The rental filters are applicable in the following sectors: Excavation works, tunnel building, remediation measures, recycling of process water, temporary filtration capacity for renovation/maintenance or new construction of filter installations.
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Bosman Watermanagement GmbH is part of the international Bosman Watermanagement Group (with further companies in Europe and headquarters in the Netherlands (www.bosmanwater.nl), which designs, manufactures and installs various systems for water and wastewater treatment as well as pumping stations.
Bosman Watermanagement GmbH, based in Berlin, has been involved in the design and distribution of Flexbed Filter systems since 2012.
Phone: +49 (0)30 43033250