| Nijhuis
Water Technology Flotation Systems are used to separate non dissolved material
from a water or process stream. Flotation technique can be used when treating: |
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Nijhuis Water Technology Flotation Systems can be divided into three
categories:
Special features for all Nijhuis Water Technology Flotation Systems:
use of high quality corrosion free materials minimum installation time compact space saving designs easy to operate standard sediment collection and discharge system standard adjustable water level and scraper mechanism for optimal sludge
consistency.
Besides these standard types, Nijhuis Water Technology also designs and
manufactures tailor made flotation systems, for instance in concrete, to meet
specific requirements from our customers.
All systems are subject to the highest quality control plans to ensure
the high quality.
Nijhuis Water Technology is quality and vice versa.
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Dissolved Air Flotation (DAF) is known for the micro air bubbles which
are dosed just before the inlet construction in the DAF unit. In its
aeration system a part of the treated water together with air are brought
under a pressure of 5 bar, where air dissolves in water. By reducing this
pressure down to 1 bar in the specially designed and patented
depressurization nozzles small air bubbles of 30-50 micron are formed,
which quickly stick to the impurities in the water and therefore cause a
high degree of clarification. All impurities rise to the surface and are
scraped off there with an automatically operating scraper mechanism.
Nijhuis Water Technology DAF Systems differ from the traditional systems
by:
patented clog free depressurization nozzles 60% saving on energy consumption due to unique aeration circuit 50% higher dry solids content of the floated sludge by the standard
installation of a sludge dewatering grid low overflow rates for a maximum separation efficiency simple extension of the system with coagulation/flocculation systems for
higher pollution reductions; see the special brochure!
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wide range of application extremely compact design use of parallel plate technology large effective separation area capacity from 0,2 up to 1500 m3/hr per unit pre-fab construction.
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used as clarifier or as sludge dewatering system at municipal waste
water treatment plants floating out light sludge to help overloaded sewage plants approx. 4% dry solids of excess sludge approx. 75% less excess sludge volume pre-fab construction.
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round tank construction -
suitable for capacities > 500 m3/hr
tank walls in concrete or steel mechanical parts pre-fabricated supplied to site minimal construction time.
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The NFF is a flotation system by which the impurities are separated from
the water by using air. With induced air the rising velocity of a particle is
increased by adding air bubbles of 100-150 micron to the water by a self air
sucking aeration system which is installed just after the inlet construction.
The air bubbles stick to the particles after which they rise to the surface from
where they are scraped off by a scraper mechanism. Any sediment will be drained
off by standard installed drain valves.
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The NGF is a flotation system by which particles are separated from
water by the difference in specific gravity from water. The floating layer
will be scraped off by an automatically operating scraper mechanism. The
rising or settling velocity of a particle is determined by its specific
characteristics and the nature of the liquid. Stoke’s law describes this
relation and allows us to calculate the rising or settling velocity.
Suitable as an alternative to an underground concrete separator, with the
advantage that no soil contamination can occur. |
Nijhuis Water Technology has a long term experience with flotation
systems in a wide variety of applications. Our specialists would be pleased to
advise you on the choice of the best flotation system and how this might be
augmented with other high quality technology to create a fully integrated water
treatment system which gives you the security you require.
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