Water treatment for the aquaculture industry
Water treatment for the aquaculture industry
Water treatment for the aquaculture industry
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Krüger Kaldnes<br />
Hegnasletta 11<br />
N-3217 Sandefjord, Norway<br />
Tel: +47 91 60 80 00<br />
Fax: +47 33 48 50 01<br />
www.veoliawaterst.com<br />
For more than 20 years, Krüger Kaldnes has supplied <strong>the</strong> <strong>aquaculture</strong><br />
<strong>industry</strong> with solutions and technologies <strong>for</strong> high quality water<br />
<strong>treatment</strong>. Our Kaldnes Moving Bed process is used in a large number<br />
of fish farms all over <strong>the</strong> world and is today <strong>the</strong> leading technology <strong>for</strong><br />
biological water <strong>treatment</strong> within <strong>the</strong> <strong>industry</strong>.<br />
Krüger Kaldnes is part of Veolia <strong>Water</strong> Solutions & Technologies<br />
comprising world class technical know-how and technologies <strong>for</strong> water<br />
purification. As such Krüger Kaldnes offers a wide range of solutions that<br />
can be tailored to meet <strong>the</strong> highest standards providing prime quality,<br />
energy efficiency and operational friendly water <strong>treatment</strong> systems.<br />
VWS Photo Library - © Richard Hermann/Galatée Films / AnoxKaldnes - 04/10<br />
<strong>Water</strong> <strong>treatment</strong><br />
<strong>for</strong> <strong>the</strong><br />
<strong>aquaculture</strong> <strong>industry</strong>
<strong>Water</strong> <strong>treatment</strong> systems<br />
<strong>for</strong> <strong>the</strong> land-based<br />
<strong>aquaculture</strong> <strong>industry</strong><br />
A full range of solutions:<br />
> Recirculating Aquaculture Systems (RAS)<br />
– up to 99.99% reuse<br />
> Treatment of intake water<br />
> Conditioning of water during production<br />
in flow through systems<br />
> Treatment of effluent water from fish farms<br />
> Sludge <strong>treatment</strong><br />
> Treatment of water and waste from fish abattoir<br />
and processing<br />
Intake water <strong>treatment</strong><br />
Krüger Kaldnes offer systems <strong>for</strong> preparation of intake water where<br />
<strong>the</strong> <strong>treatment</strong> may typically include one or more of <strong>the</strong> following unit<br />
processes:<br />
> Solids removal (Filtration)<br />
> Disinfection<br />
> Alkalinity and pH adjustment<br />
> Biological <strong>treatment</strong><br />
> CO 2<br />
and N 2<br />
stripping<br />
> Oxygenation<br />
Krüger Kaldnes RAS<br />
For land-based fish farms, Recirculation Aquaculture Systems (RAS) provide<br />
significant advantages towards flow through systems. Excellent water quality,<br />
rich water quantities and preservation of temperature are all key factors to provide<br />
good health and optimal growth conditions <strong>for</strong> fish.<br />
Krüger Kaldnes RAS plants are tailored <strong>for</strong> optimum conditions related to fish species, degree of recirculation, fish<br />
tank configuration and source of raw water. Components that typically will be removed in a Krüger Kaldnes RAS<br />
plant include organic matter, total ammonium nitrogen (TAN), suspended solids, CO 2<br />
, N 2<br />
and harmful bacteria/<br />
virus. They will also provide optimum conditions related to pH and alkalinity. Krüger Kaldnes’ solutions are being<br />
used <strong>for</strong> both fresh- and saltwater systems.<br />
AnoxKaldnes MBBR<br />
State-of-<strong>the</strong>-Art Solutions and Technologies<br />
Hydrotech drum filters<br />
<strong>Water</strong> conditioning in flow through systems<br />
Elevated CO 2<br />
concentrations and marginal O 2<br />
levels are <strong>the</strong> main challenge in flow through systems. This has a<br />
negative impact on fish welfare and growth rate. With more intensive and stable production, Krüger Kaldnes<br />
offers cost-effective systems <strong>for</strong> CO 2<br />
stripping and aeration.<br />
Effluent water <strong>treatment</strong> from fish farms and abattoir waste<br />
Wastewater from fish farms and production plants constitutes pollutants that may harm <strong>the</strong> receiving water<br />
resources. Treatment of discharges is hence often a necessity to ensure sustainability of fish production facilities.<br />
Effluent <strong>treatment</strong> will typically constitute processes <strong>for</strong> removal of major pollutants such as organic matter,<br />
suspended solids, ammonia nitrogen and bacteria/virus. Krüger Kaldnes offer a wide range of <strong>treatment</strong> solutions<br />
<strong>for</strong> <strong>the</strong>se objectives. Typical unit processes may include:<br />
> Biological <strong>treatment</strong><br />
> Solids removal<br />
> Disinfection<br />
The Moving Bed Biofilm<br />
Reactor (AnoxKaldnes MBBR)<br />
is our own proprietary<br />
technology, and <strong>the</strong> biological<br />
engine of Krüger Kaldnes RAS.<br />
The MBBR technology allows<br />
<strong>the</strong> microorganisms to grow<br />
on sheltered, surfaces inside moving, plastic carriers<br />
creating a continuous biofilm process without any risk<br />
<strong>for</strong> clogging and without any need <strong>for</strong> back flushing.<br />
Advantages like low head loss and high volumetric<br />
capacity make <strong>the</strong> process compact and well suited<br />
<strong>for</strong> <strong>treatment</strong> of large water flows. The process is very<br />
robust and easily operated with a minimum need <strong>for</strong><br />
maintenance.<br />
Biomass from <strong>the</strong> AnoxKaldnes<br />
MBBR process, fish faeces<br />
and excess feed is efficiently<br />
separated with Hydrotech drum<br />
filters, ano<strong>the</strong>r well known<br />
Veolia <strong>Water</strong> Solutions &<br />
Technologies’ technology in<br />
<strong>the</strong> <strong>industry</strong>.<br />
The Hydrotech TM filters have a high hydraulic capacity,<br />
are easy to operate and provide a predictable result.<br />
Typical mesh sizes are 40-90 micron, but can be<br />
delivered with mesh sizes down to 10 micron.<br />
Sludge <strong>treatment</strong><br />
Sludge and waste from fish farm facilities typically comprises biomass from biological <strong>treatment</strong>, fish faeces, feed<br />
waste, dead fish and abattoir waste. Krüger Kaldnes offers solutions <strong>for</strong>:<br />
> Storage<br />
> Stabilization<br />
> Hygienization<br />
> Dewatering<br />
Krüger Kaldnes has developed a range of concepts <strong>for</strong> sludge handling at fish farms and fish processing sites. The<br />
different systems are adapted to each individual site based on quantity and quality of raw sludge, local regulations<br />
and transportation- and end user requirements. All of Krüger Kaldnes’ sludge <strong>treatment</strong> systems focus on high<br />
quality, low energy and simple operation with low requirements <strong>for</strong> maintenance.<br />
O<strong>the</strong>r processes provided in Krüger Kaldnes RAS plants may<br />
include oxygenation, ozonation, UV disinfection, CO 2<br />
removal,<br />
N 2<br />
removal and alkalinisation. Krüger Kaldnes RAS provides<br />
highly compact and energy efficient solutions with focus on<br />
easy operation and low maintenance requirements.