As expert in the field of Water treatment, we actively develop improved membrane technologies, new applications and engineering standards. Our objective is to reduce the total cost of ownership and provide you with reliable and robust membrane applications.
Introduction
Industries, utility companies and governments need reliable membrane systems that are not only cost-effective today, but also in future. DHV stands with a firm foot in the quickly developing world of membrane filtration. We have expertise in the whole field of membrane filtration: from design to maintenance and from wastewater treatment to ultra-pure water production. DHV has operating experience with many applications and membrane systems. This expertise guarantees we provide you with the best membrane process fitted to your needs. From simple micro, nano, ultra and hyper filtration, diffusion dialysis up to electrodialyses, bi-polar membranes, liquid membranes, pervaporation and membrane bioreactors, we put the technologies in the right perspective. For consultancy, engineering, turnkey projects or operational lease, you will find that we are your favorite partner.
Some examples of DHV-driven innovations are:
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AirFlush®, a cost-effective concept applying semi dead-end membrane filtration;
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Water recovery from industrial and muncipial wastewater by direct nanofiltration;
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Large- scale membrane bioreactors (MBR);
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Direct membrane filtration of surface water;
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Optiflux®, hydraulic optimisation that results in a cost-efficient design and operation;
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Effective cleaning procedures;
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Recycling of ion-exchange regenerate;
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Cost-effective stack design that enables to have full flexibility in future membrane types selection (Nautilus®).
Close fit requires tailor made solution
In 1999, the Beverwijk STP faced a further extension to comply with new requirements for nitrogen removal. Since the plants premises are cramped for space, construction of supplementary aeration volume and sedimentation tanks is not feasible.
DHV has found a cost-effective solution in the conversion of the activated sludge system to a membrane bioreactor. DHV has tested during 3 years a variety of commercially available MBR-systems at industrial scale equipped with as well submerged low-pressure hollow fibre membranes as with tubular membranes or (rotated) plate membranes. The tubular membranes are normally operated as high-pressure systems. At Beverwijk, the tubular membranes are operated in a whole new way as submerged low-pressure membranes in combination with the proven and DHV patented AirFlush® cleaning procedure.
Large MBR-plants
The ongoing research and development of the MBR technology in the Netherlands has led to the realisation of the municipal MBR with a capacity of 755 m3/h at wwtp Varsseveld. For the rendering company Rendac, DHV has upgraded one of the existing biological Carrousel® systems to a membrane bioreactor. After careful evaluation, submerged membranes were selected to separate treated wastewater and activated sludge. DHV supplied the membrane filtration system as part of a turnkey project for the Carrousel® upgrade. The result is Europes largest known membrane bioreactor with a capacity of 140.000 p.e.
Zero-discharge in semiconductor industry
Guided by DHV a team of water and semi-conductor production experts from several European companies have been challenged to design a closed-loop water system for the fab-of-the-future plant. This indeed is a challenge, since wastewater has to be upgraded to ultra-pure water: the highest water quality known with many specifications in the part per trillion-concentration range.
Membrane filtration plays a vital role in this concept. Examples of some applied membrane techniques are hyperfiltration, electro-deionisation, membranebioreactor and electrodialysis.
"One step" Ultra- and Nanofiltration
"One step" nanofiltration is possible thanks to smart use of the AirFlush® concept. Pilot tests showed that surface water or effluent from sewage treatment plants can be treated with NF (or UF) directly, without any pre-treatment, resulting in high quality process water. Due to this compact one step treatment concept, the system outstands systems applying ultrafiltration in combination with spiral wound NF/RO membranes. Tests on direct treatment of surface water show that a stable flux is obtained and fouling can be easily controlled.
If you need more information, please feel free to download some articles and project descriptions or contact us.
You may also complete the Questionnaire and return it to us. Based on your situation we surely will find the most cost-efficient solution.
