DESMI Proven Technology 1

DESMI Proven Technology 3

DESMI Proven Technology 2

DESMI Proven Technology 4

DESMI Proven Technology 5

News


Tests Warn Ship-Owners About Possible Shortcomings of IMO-Approved BWTS

Tests Warn Ship-Owners About Possible Shortcomings of IMO-Approved BWTS

18.11.2011

TEST PREMISES
DESMI Ocean Guard was the first to conduct ballast water treatment tests with a UV based system in fresh water and during this process they met some unexpected challenges. Their findings offer new information to the ship owners that will soon have to ensure that their vessels are in accordance with IMO regulations.

Ballast Water Treatment is a new topic in the marine world and not much experience has been gathered yet. That became very clear to DESMI Ocean Guard who chose to test their ballast water treatment system not only in saline but also in fresh water. IMO Resolution 174(58) only requires tests in two of three water types, viz.

• Fresh water with salinity lower than 3 ‰,
• Brackish water with salinity between 3-32 ‰
• High-salinity water with salinity above 32 ‰

So far only the last two types have been tested by other companies offering UV-based concepts.
DESMI Ocean Guard decided to test the system in fresh water and brackish water as these water qualities seemed to be more challenging. Additional requirements to silt (non-organic solids) in the test water are outlined in the IMO-Resolution, and this was taken into consideration knowing that ship owners have a natural concern about filters in their ballast water systems. Also, testing the system in fresh water is very relevant since quite a few larger harbours are fresh water harbours either the entire year round like Antwerp, or in some periods of the year like Hamburg and Bremerhaven. The same applies to several Asian harbours that are of strategic importance to A.P. Møller-Maersk. Therefore, a water treatment system that has been approved by IMO, but only tested in salt or brackish water, may unexpectedly deliver unsatisfactory test results.

DESMI Ocean Guard A/S was established by A.P. Moller Maersk A/S, DESMI A/S and Skjølstrup & Grønborg ApS following a successful innovation project carried out by Maersk Maritime Technology, DESMI and Skjølstrup & Grønborg. It was decided to perform the required land-based tests at the accredited test institute in Hundested (Denmark) which is owned and operated by DHI (Danish Hydraulic Institute) whose expertise and assistance were greatly appreciated during the process.

TEST PROCEDURE
The test water is treated in three steps
• filtration
• UV radiation
• and ozone generated in-situ by the UV-system

The DESMI Ocean Guard system is very energy-efficient and compact. Maximum observed power consumption of the entire system is 11 kWh/100 m3. This makes it very attractive to ship owners who are very conscious about lack of space and power availability onboard their vessels.

The first tests were carried out in brackish water and the results were compatible with IMO regulations right away. The fresh water tests, however, presented an unexpected outcome. They showed that too many large organisms (over 50 microns) could get through the system. It made specialists wonder, because the filter mesh is 40 microns which was enough to effectively remove organisms larger than 50 microns in brackish water.

Since no similar tests have been done before, specialists from DESMI Ocean Guard and DHI had to find the answers themselves. It turned out that some fresh water species are much softer than the ones living in waters of higher salinity and could easier squeeze through the tight filters.

The IMO regulations are very strict when it comes to larger organisms. Three water samples are taken and the average amount of organisms over 50 microns has to be less than 10 organisms per cubic metre. Whereas when it comes to smaller organisms, it should be less than 10 organisms per millilitre.

DESMI Ocean Guard’s specialists realized that the filter, which in the beginning seemed to be the simplest and least important part of the system, had a huge impact on the success of the test results when it comes to the larger organisms. Right now DESMI Ocean Guard has a patent pending related to the novel way of using the filter. By using the unique DESMI Ocean Guard method, more than 90% of the tests for larger organisms showed 0 viable organisms.

Right now the system is going through the IMO shipboard test onboard the container vessel of Thurø Maersk. The first two out of three required tests have already been successfully completed. The salinity of the water tested aboard Thurø Maersk is high (34 ‰), meaning that the DESMI Ocean Guard Ballast Water Treatment System has right now been successfully tested in all three salinities. At present DESMI Ocean Guard awaits the required 6 months test interval to pass before the final test can be finalized by March 2012. The system will be type-approved shortly after this.

Related news


To the top

Join DESMI at Marintec China, 3-6 December 2019

The Maritime exhibition, Marintec China, is taking place December 3-6 in Shanghai, China

I’m interested. Tell me more

Join DESMI at Middle East District Cooling Stakeholders Conclave 4-5 December 2019

The Middle East District Cooling Stakeholders Conclave is taking place December 4-5 at the Radisson Blu Hotel, Dubai Waterfront

I’m interested. Tell me more

Join DESMI at The BWMTech Conterence, 9-11 December 2019

2 day conference with ship owner case studies on ballast water and brand new workshop on crew training taking place in London 9-11 December 2019

I’m interested. Tell me more

Join DESMI at SEPEM 2020, 28-30 January

SEPEM Industry Northwest is taking place January 28-30 2020 in Rouen, France

I’m interested. Tell me more

Join DESMI at the Ghana Trade Show, 30 Jan - 1 Feb 2020

Ghana Trade Show is the main international event for all trades. Setting new highs for participation from over 20 countries & visitors from over 12 African countries taking place 30 Jan - 1 Feb 2020 in Accra, Ghana at the Accra International Conference Center

I’m interested. Tell me more

Join DESMI at EuroMaritime, 4-6 February 2020

Join the the main trade meeting of the Euromediterranean maritime industry taking place February 4-6 2020 in Marseille, France at Marceille Chanot

I’m interested. Tell me more

Join DESMI at Sea Japan, 11-13 March 2020

Sea Japan is the biggest maritime event in Japan taking place March 11-13 2020 in Tokyo, Japan at the Tokyo Big Sight, west hall

I’m interested. Tell me more

Join DESMI at the Irish Skipper Expo, 13-14 March 2020

The Irish Skipper Expo is taking place March 13-14 2020 in Limerick, Ireland at the Castletroy Park Hotel

I’m interested. Tell me more

Join DESMI at Asia Pacific Maritime, 18-20 March 2020

Asia Pacific Maritime (APM) is a premier exhibition and conference in Asia showcasing a complete overview of the vessel sectors – services and solutions, technology, vessels equipment, machineries, supplies, and many more taking place March 18-20 in Singapore at the Marina Bay Sands

I’m interested. Tell me more

Join DESMI at ISH China & CIHE 2020, 11-13 May

ISH China & CIHE – China is an International Trade Fair for Heating, Ventilation, Air-Conditioning, Sanitation & Home Comfort Systems taking place May 11-13 2020 in Beijing, China at the New China International Exhibition Center

I’m interested. Tell me more

Join DESMI at Maritime Industry Gorinchem, 12-14 May 2020

The Maritime Industry exhibition is taking place May 12-14 May 2020 in Gorinchem, Netherlands at the Evenementalhal Gorincham

I’m interested. Tell me more

Join DESMI at the Submarine Technology Symposium, 12-14 May 2020

The Submarine Technology Symposium taking place May 12-14 2020 in Laurel, USA

I’m interested. Tell me more

Join DESMI at CHEMUK 2020, May 13-14

The UK's chemical industries supply chain expo is taking place May 13-14 2020 in Stretford, United Kingdom at the Eventcity Limited

I’m interested. Tell me more

Join DESMi at AquaCulture UK 2020, 19-21 May

Aquaculture UK is the most important aquaculture exhibition and conference held in the British Isles taking place May 19-21 2020 in Aviemore, Scotland at the Macdonald Aviemore Resort

I’m interested. Tell me more

Join DESMI at Posidonia 2020, 1-5 June

The International Shipping Exhibition taking place June 1-5 in Athens, Greece at the Metropolitan Expo

I’m interested. Tell me more

Join DESMI at Future Surface Fleet, 2-4 June 2020

Future Surface Fleet 2020 explores the wide range of programmes being conducted by nations and how new and changing technologies will influence the maritime environment over the next 25 years. - taking place 2-4 October 2020 in Portsmouth, UK at the Portsmouth Mariott Hotel

I’m interested. Tell me more

Join DESMI at FLOWTECH CHINA 2020, 03-05 Jun

Flowtech China is taking place June 03-05 2020 in Shanghai, China at the National Convention & Exhibition Center

I’m interested. Tell me more

Join DESMI at Philipines Marine, 16-18 June 2020

The 7th Edition of PHILIPPINES MARINE (PHILMARINE) 2020 co-located with Shipbuild Philippines and O­ffshore Philippines 2020 is taking place June 16-18 2020 in Pasay City, Philippines at the SMX Convention Center Manila, Mall of Asia Complex

I’m interested. Tell me more

Join DESMI at Hillhead 2020, 23-25 June

Hillhead is the largest exhibition of its kind anywhere in the world taking place June 23-25 2020 in Derbyshire, United Kingdom at the Hillhead quarry exhibition

I’m interested. Tell me more

Join DESMi at Zambia Trade & Fair 2020, 26 Jun - 02 Jul

Zambia Trade & Fair is taking place June 26 - July 02 2020 in Ndola, Zambia at the Trade Fair Grounds

I’m interested. Tell me more

Join DESMI at Marintec 2020, 11-13 August

Marintec South America is s a must attend trade-show for anyone who wants to stay ahead in the maritime market taking place August 11-13 2020 in Rio de Janeiro, Brazil at the SulAmerica Convention Center

I’m interested. Tell me more

Join DESMI at Nor-Fishing, 18-21 August 2020

One of the largest fisheries technology exhibitions in the world, Nor-Fishing is taking place August 18-21 2020 in Trondheim, Norway at the Trondheim Spektrum

I’m interested. Tell me more

Join DESMI at SMM, 8-11 September 2020

The leading international maritime trade fair SMM is taking place September 8-11 2020 in Hamburg, Germany at Hamburg Messe + Congress

I’m interested. Tell me more

Join DESMI at Euronaval 2020, 20-23 October

The world naval defense exhibition taking place October 20-23 2020 in Paris, France at Paris Le Bourget Exhibition Centre

I’m interested. Tell me more

We use cookies to enhance our website and improve your experience of it. If you say no to cookies, our website will still function, but it may result in diminished functionality.

OK