WO2013070085A1 - A system for cleaning ballast water - Google Patents

A system for cleaning ballast water Download PDF

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Publication number
WO2013070085A1
WO2013070085A1 PCT/NO2012/050216 NO2012050216W WO2013070085A1 WO 2013070085 A1 WO2013070085 A1 WO 2013070085A1 NO 2012050216 W NO2012050216 W NO 2012050216W WO 2013070085 A1 WO2013070085 A1 WO 2013070085A1
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WO
WIPO (PCT)
Prior art keywords
water
cylinder
filter
cleaning
unit
Prior art date
Application number
PCT/NO2012/050216
Other languages
French (fr)
Inventor
Arthur SANDUM
Original Assignee
Timbernor Ou
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Timbernor Ou filed Critical Timbernor Ou
Publication of WO2013070085A1 publication Critical patent/WO2013070085A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
    • B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/484—Treatment of water, waste water, or sewage with magnetic or electric fields using electromagnets
    • C02F1/485—Treatment of water, waste water, or sewage with magnetic or electric fields using electromagnets located on the outer wall of the treatment device, i.e. not in contact with the liquid to be treated, e.g. detachable
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/487—Treatment of water, waste water, or sewage with magnetic or electric fields using high frequency electromagnetic fields, e.g. pulsed electromagnetic fields
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3227—Units with two or more lamps
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Definitions

  • the present invention relates to a system for the cleaning of ballast water in ships.
  • Background In order to maintain stability during transit, ships fill their ballast tanks with water. Ballast water is often taken on in the coastal waters in one region when ships unload cargo, and discharged at the next port of call, wherever more cargo is loaded. Large ships may carry a tremendous amount of ballast water.
  • the release of ballast water may introduce non-native organisms into the port of discharge, including plants, animals, viruses, and other microorganisms. These introduced species, or bioinvaders, also referred to as alien species, have the potential to cause extensive ecological and economic harm.
  • ballast water of shipping vessels has been a primary method of alien species introduction throughout the world. These bioinvaders can cause disruptions in the natural ecosystem, economic troubles, and even carry human diseases.
  • bioinvaders may grow very quickly in the absence of natural enemies that may check the propagation of said organisms.
  • bioinvaders may displace native organisms by preying on them or outcompeting native species for food and habitat space. Economic damage may occur when a bioinvader displaces species that are harvested for food or other goods, or when bioinvaders damage structures.
  • the zebra mussel was introduced into the Great Lakes from the Baltic countries, probably via the ballast water of a transatlantic freighter in 1988. These organisms grow on almost any structure, forming large clumps of mussels which can clog water intake pipes and damage or impair other structures. However, recently another bioinvader, the quagga mussel, has established itself in the same waters. This mussel has the potential to even outdo the zebra mussel.
  • ballast water Most of the current strategies to deal with the problems posed by ballast water recommend exchanging ballast water in the open ocean, where ships discharge and refill their ballast tanks. This method is effective because organisms from coastal waters are unlikely to survive in the open ocean and vice versa. However, some organisms will remain in residual ballast water or cling to the inside of the tanks, and thus become transferred to the new ballast water. Organisms remaining inside the ballast tanks may then be discharged at a later time into ports and harbors if the exchange fails to remove all organisms. It may also be unsafe for a ship to exchange ballast water in high seas. With international shipping steadily increasing in volume, regulations are under way requiring ballast water to be cleaned or disinfected before being released.
  • ballast water Several systems for cleaning ballast water have been proposed.
  • Known systems are based on the water being treated continuously when pumped in from the sea.
  • the treatment may include filtering, adding nitrogen gas and/or supplying ultrasonic energy.
  • a problem may be that large amounts of water have to be treated in a short time when water is pumped in.
  • the treatment may also be repeated when releasing the water into the sea, in order to ensure that the desired effect has been achieved.
  • Fine filters which potentially could take much of the cleaning job, cannot be used as they are too easily clogged.
  • the following cleaning gear is affected by scale formed by precipitation of chalk from the water. The scaling may cause pipework blockages, valve and pump seizures, and affect the main cleaning gear. Thus, maintenance operations have to be performed regularly on the installation in order to maintain the required cleaning efficiency. Summary of the invention
  • the present invention has as an object to provide a system for cleaning ballast water that at least partly avoids the above-mentioned drawbacks.
  • the system includes a compact cleaning unit installed in a line conducting water that either is retrieved from the surrounding sea or from one or more ballast tanks in the ship.
  • Said cleaning system includes a mechanical filter unit, a descaler and a UV unit.
  • the filter unit includes both a coarse filter and a subsequent fine filter. Both filters include cleaning gear to prevent the filters from being clogged.
  • the descaler includes a tube and a surrounding magnet coil. Frequency swept electrical pulses are fed to the coil.
  • Fig. 1 is an overview of the inventive system
  • Fig. 2 is a view of the inside of a part of the inventive system
  • Fig. 3 shows a detail of the filter unit
  • Fig. 4 shows another detail of the filter unit.
  • the invention includes a cleaning unit 1, Fig. 1, to be installed in the pipeline conducting water from the sea to the ballast tank in a ship.
  • the unit may be installed before or after the pump.
  • the unit includes a vessel with two
  • the first compartment 2 is a filter compartment with a coarse filter and a fine filter.
  • the second compartment 3 houses a UV-unit.
  • the compartments are linked by a descaler unit 4.
  • Fig. 2 shows the interior of the vessel in detail. Water is lead into the filter compartment 2 through the inlet 5.
  • the coarse filter includes a first cylindrical filter unit 6 which is rotated by a motor device (not shown). Water will pass through the coarse filter cylinder from the outside to the inside. To remove debris collecting on the outside of the filter cylinder, the coarse filter cylinder 6 is rotated past a scraper 7.
  • the scraper is designed as a longitudinal roll with a longitudinal edge 8 engaging the surface of the cylinder, as shown in detail in Fig. 3. As the cylinder is rotated, debris will be scraped off the outer surface by the edge 8. The debris will collect inside the roll, and be removed through a small pipeline 9 connected to the bottom part of the scraper and returned to the outside sea.
  • a cleaning arrangement 11, 15 is adapted to remove debris collecting on the fine filter cylinder.
  • the cleaning arrangement shown in further detail in Fig. 4, includes a longitudinal injection chamber 11 mounted on the inside of the fine filter cylinder and spanning the whole length of the fine filter cylinder.
  • injection chamber 11 mounted on the inside of the fine filter cylinder and spanning the whole length of the fine filter cylinder.
  • injection chamber there are mounted an array of injection nozzles 13 adapted to eject rays of pressurized water, the water being delivered from a pump (not shown) through a water pipe 14. The nozzles will loosen any debris collected on the outside of the cylinder as the cylinder is rotated.
  • the loosened debris will be collected in a collection chamber 15 on the outside of the cylinder 10, also this chamber spanning the whole length of the cylinder, and removed through another small pipeline 16 and returned to the sea.
  • the water is conducted from the filter unit through an opening in the bottom wall inside the fine filter cylinder, and delivered to the UV- unit via the descaler unit 4.
  • the descaler 4, fig. 1, is included in order to avoid matter in the water from precipitating and clinging onto the interior parts of the downstream equipment.
  • the descaler includes a pipe section onto which a coil 17 has been wound.
  • the coil 17 is energized with an alternating electric current signal setting up an oscillating magnetic field in the water, the pipe section acting as a transformer with the water as the secondary winding.
  • the signal is delivered by a signal generator (not shown).
  • the magnetic field strips scaling mineral ions off the water molecules creating sites of nucleation and forcing oppositely charged ions to combine. The result is inert and non-scaling crystals of calcium carbonate which simply wash through the system.
  • the signal In order to hit the resonance frequency of the molecules, the signal is in the form of a train of square waves that are swept in frequency, e.g. from 0.5 to 50 kHz several times a second, and preferably from 1 kHz to 12 kHz at a rate of 20 times a second.
  • the signal will produce harmonic oscillations into the megahertz range.
  • the induced oscillating electric field provides the necessary molecular agitation for scale prevention and removal.
  • the induced molecular agitation causes the unstable mineral ions to precipitate, providing initial nucleation sites for further precipitation of adjacent mineral ions.
  • a snowball effect starts, resulting in growth of many crystals, each consisting of numerous mineral ions. These insoluble salts become large in size and float with the water. Thus, they do not stick to the metal surfaces because the crystals are not charged.
  • the inventive UV unit 3 is shown in Fig. 1 and 2.
  • Water is received from the descaler 4 through a water inlet at the bottom of the second compartment.
  • a protection cylinder 18 is mounted around this water inlet.
  • the protection cylinder has a wall that is solid in the part facing the interior of the second compartment and perforated in the opposing part, the part pointing away from the interior of the compartment. This is to protect components in the innards from being directly exposed to the stream of incoming water.
  • In the compartment there is installed a number of glass tubes 19 that pass through the compartment from top to bottom. Inside the glass tubes, there are mounted UV tubes 20. The water will enter the compartment through the inlet, flow between the glass tubes 19 and become irradiated by UV light from the UV tubes 20 inside the glass tubes, before leaving the compartment through the outlet 21.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)

Abstract

It is disclosed a system for cleaning ballast water in a ship. The system includes a filter unit (2), a descaler (4) and a UV unit (3) installed in series. The filter unit includes a coarse (6) and a fine (10) filter section with cleaning devices (7, 11, 15) for continuously cleaning of the filter sections. The descaler includes a pipe section with a coil (17) wound thereon, and a signal generator for energizing the coil with a square wave signal that is swept in frequency. The UV unit includes a longitudinal cylindrical vessel with a water inlet and a water outlet, a number of glass tubes installed in the vessel, in the longitudinal direction thereof, and fluorescent UV tubes installed in the glass tubes.

Description

A SYSTEM FOR CLEANING BALLAST WATER
Field of the Invention
The present invention relates to a system for the cleaning of ballast water in ships. Background In order to maintain stability during transit, ships fill their ballast tanks with water. Ballast water is often taken on in the coastal waters in one region when ships unload cargo, and discharged at the next port of call, wherever more cargo is loaded. Large ships may carry a tremendous amount of ballast water. The release of ballast water may introduce non-native organisms into the port of discharge, including plants, animals, viruses, and other microorganisms. These introduced species, or bioinvaders, also referred to as alien species, have the potential to cause extensive ecological and economic harm.
The ballast water of shipping vessels has been a primary method of alien species introduction throughout the world. These bioinvaders can cause disruptions in the natural ecosystem, economic troubles, and even carry human diseases.
Populations of bioinvaders may grow very quickly in the absence of natural enemies that may check the propagation of said organisms. In turn bioinvaders may displace native organisms by preying on them or outcompeting native species for food and habitat space. Economic damage may occur when a bioinvader displaces species that are harvested for food or other goods, or when bioinvaders damage structures.
This has occurred several times, e.g. the North American Comb Jelly was probably introduced via ballast water from New England (USA) into the Black Sea. Among other, the comb jelly feeds on plankton. In its new environment, the comb jelly has no natural predators and has outcompeted native species for food. As a
consequence, the once profitable anchovy fisheries in Russia and Turkey have almost disappeared.
The zebra mussel was introduced into the Great Lakes from the Baltic countries, probably via the ballast water of a transatlantic freighter in 1988. These organisms grow on almost any structure, forming large clumps of mussels which can clog water intake pipes and damage or impair other structures. However, recently another bioinvader, the quagga mussel, has established itself in the same waters. This mussel has the potential to even outdo the zebra mussel.
There are also known examples of cholera being transferred in ballast water from the Far East into South America causing death among humans.
Most of the current strategies to deal with the problems posed by ballast water recommend exchanging ballast water in the open ocean, where ships discharge and refill their ballast tanks. This method is effective because organisms from coastal waters are unlikely to survive in the open ocean and vice versa. However, some organisms will remain in residual ballast water or cling to the inside of the tanks, and thus become transferred to the new ballast water. Organisms remaining inside the ballast tanks may then be discharged at a later time into ports and harbors if the exchange fails to remove all organisms. It may also be unsafe for a ship to exchange ballast water in high seas. With international shipping steadily increasing in volume, regulations are under way requiring ballast water to be cleaned or disinfected before being released.
International regulations controlling this field will gradually be introduced from 2013.
Several systems for cleaning ballast water have been proposed. Known systems are based on the water being treated continuously when pumped in from the sea. The treatment may include filtering, adding nitrogen gas and/or supplying ultrasonic energy. There are also known systems based on the addition of biocides. A problem may be that large amounts of water have to be treated in a short time when water is pumped in. The treatment may also be repeated when releasing the water into the sea, in order to ensure that the desired effect has been achieved.
The authorities demand that the effect of cleaning is documented, and may in some instances on their own control the effect by taking samples for sequent analysis. Problems may arise if the analysis reveals insufficient cleaning effect. Then, the release of water will be denied, even with a second cleaning step, as its effect cannot be ascertained and also not verified after the water has been let out. When the ship cannot release the ballast water, it cannot load cargo either. The situation is locked because it is not possible to treat the water in the tanks. Prior art cleaning systems are very much affected by debris and impurities present in the water. There is usually a coarse filter present at the water inlet preceding the pump. This filter must be very coarse to avoid being clogged by weeds and other debris in the water. Fine filters, which potentially could take much of the cleaning job, cannot be used as they are too easily clogged. Further, the following cleaning gear is affected by scale formed by precipitation of chalk from the water. The scaling may cause pipework blockages, valve and pump seizures, and affect the main cleaning gear. Thus, maintenance operations have to be performed regularly on the installation in order to maintain the required cleaning efficiency. Summary of the invention
The present invention has as an object to provide a system for cleaning ballast water that at least partly avoids the above-mentioned drawbacks.
The system includes a compact cleaning unit installed in a line conducting water that either is retrieved from the surrounding sea or from one or more ballast tanks in the ship. Said cleaning system includes a mechanical filter unit, a descaler and a UV unit. The filter unit includes both a coarse filter and a subsequent fine filter. Both filters include cleaning gear to prevent the filters from being clogged.
Even though the filter unit may remove a lot of organisms from the water, the main cleaning step is performed by the UV-unit. The purpose of the descaler is to dissolve impurities present in the water to avoid negative influence on the UV unit. It is a problem in that impurities in the water prevent the light from acting on the organisms to be treated. The descaler includes a tube and a surrounding magnet coil. Frequency swept electrical pulses are fed to the coil. Brief description of the drawings
Further features of the invention as well as its benefits, will appear from the following detailed description, which is to be read in the context of the appended drawings, in which :
Fig. 1 is an overview of the inventive system, Fig. 2 is a view of the inside of a part of the inventive system,
Fig. 3 shows a detail of the filter unit, and
Fig. 4 shows another detail of the filter unit.
Detailed description The invention includes a cleaning unit 1, Fig. 1, to be installed in the pipeline conducting water from the sea to the ballast tank in a ship. The unit may be installed before or after the pump. The unit includes a vessel with two
compartments. The first compartment 2 is a filter compartment with a coarse filter and a fine filter. The second compartment 3 houses a UV-unit. The compartments are linked by a descaler unit 4.
Fig. 2 shows the interior of the vessel in detail. Water is lead into the filter compartment 2 through the inlet 5. The coarse filter includes a first cylindrical filter unit 6 which is rotated by a motor device (not shown). Water will pass through the coarse filter cylinder from the outside to the inside. To remove debris collecting on the outside of the filter cylinder, the coarse filter cylinder 6 is rotated past a scraper 7. The scraper is designed as a longitudinal roll with a longitudinal edge 8 engaging the surface of the cylinder, as shown in detail in Fig. 3. As the cylinder is rotated, debris will be scraped off the outer surface by the edge 8. The debris will collect inside the roll, and be removed through a small pipeline 9 connected to the bottom part of the scraper and returned to the outside sea.
Inside the coarse filter cylinder there is coaxially mounted a smaller fine filter cylinder 10. The fine filter cylinder 10 is also rotated by a motor (not shown). A cleaning arrangement 11, 15 is adapted to remove debris collecting on the fine filter cylinder. The cleaning arrangement, shown in further detail in Fig. 4, includes a longitudinal injection chamber 11 mounted on the inside of the fine filter cylinder and spanning the whole length of the fine filter cylinder. In the injection chamber there are mounted an array of injection nozzles 13 adapted to eject rays of pressurized water, the water being delivered from a pump (not shown) through a water pipe 14. The nozzles will loosen any debris collected on the outside of the cylinder as the cylinder is rotated. The loosened debris will be collected in a collection chamber 15 on the outside of the cylinder 10, also this chamber spanning the whole length of the cylinder, and removed through another small pipeline 16 and returned to the sea. The water is conducted from the filter unit through an opening in the bottom wall inside the fine filter cylinder, and delivered to the UV- unit via the descaler unit 4.
The descaler 4, fig. 1, is included in order to avoid matter in the water from precipitating and clinging onto the interior parts of the downstream equipment. The descaler includes a pipe section onto which a coil 17 has been wound. The coil 17 is energized with an alternating electric current signal setting up an oscillating magnetic field in the water, the pipe section acting as a transformer with the water as the secondary winding. The signal is delivered by a signal generator (not shown). The magnetic field strips scaling mineral ions off the water molecules creating sites of nucleation and forcing oppositely charged ions to combine. The result is inert and non-scaling crystals of calcium carbonate which simply wash through the system. In order to hit the resonance frequency of the molecules, the signal is in the form of a train of square waves that are swept in frequency, e.g. from 0.5 to 50 kHz several times a second, and preferably from 1 kHz to 12 kHz at a rate of 20 times a second. The signal will produce harmonic oscillations into the megahertz range. The induced oscillating electric field provides the necessary molecular agitation for scale prevention and removal. The induced molecular agitation causes the unstable mineral ions to precipitate, providing initial nucleation sites for further precipitation of adjacent mineral ions. A snowball effect starts, resulting in growth of many crystals, each consisting of numerous mineral ions. These insoluble salts become large in size and float with the water. Thus, they do not stick to the metal surfaces because the crystals are not charged.
It is well known in water chemistry that most water molecules are locked in aggregates in liquid water and less than 20% exist as free water molecules. This is because water molecules have a dipole moment - the hydrogen atom is attracted to the oxygen atom of the adjacent water molecule. The frequency modulated square wave signal in the inventive descaler allows the induced electrical agitation to tune to the natural frequency of the water molecules vibrating in the aggregates. Through the cooperative resonance of the water molecules, free water molecules become available, dissolving existing scale in the system.
The inventive UV unit 3 is shown in Fig. 1 and 2. Water is received from the descaler 4 through a water inlet at the bottom of the second compartment. A protection cylinder 18 is mounted around this water inlet. The protection cylinder has a wall that is solid in the part facing the interior of the second compartment and perforated in the opposing part, the part pointing away from the interior of the compartment. This is to protect components in the innards from being directly exposed to the stream of incoming water. In the compartment there is installed a number of glass tubes 19 that pass through the compartment from top to bottom. Inside the glass tubes, there are mounted UV tubes 20. The water will enter the compartment through the inlet, flow between the glass tubes 19 and become irradiated by UV light from the UV tubes 20 inside the glass tubes, before leaving the compartment through the outlet 21.

Claims

C l a i m s
A system for cleaning ballast water,
c h a r a c t e r i z e d i n a combination of a filter unit (2), a descaler (4) and a UV unit (3).
A system according to claim 1, wherein the filter unit (2) includes a coarse filter cylinder (6) and a fine filter cylinder (10) mounted coaxially inside said coarse filter cylinder (6), both the coarse and fine filter cylinders being rotated by a motor, the filter unit further including cleaning devices for cleaning the cylinders while they are rotated.
A system according to claim 2, wherein the filter unit includes a longitudinal scraper (7) engaging the outer surface of the coarse filter unit (6) and removing any debris collected thereon while the cylinder is rotated.
A system according to claim 2, wherein the filter unit includes a longitudinal injection chamber (11) mounted on the inside of said fine filter cylinder (10), the injection chamber including an array of nozzles ejecting rays of pressurized water towards the inside of the fine filter cylinder (10), and a longitudinal collection chamber (15) mounted on the outside of said fine filter (10) and opposing said injection chamber (11), the collection chamber being adapted to collect debris loosened by the action of said nozzles.
A system according to claim 1, wherein the descaler (4) includes a pipe section with a coil (17) wound thereon, and a signal generator for energizing the coil with a square wave signal that is swept in frequency.
6. A system according to claim 5, wherein the square wave signal is swept between o.5 and 50 kHz several times a second.
A system according to claim 5, wherein the square wave signal is swept between 1 and 12 kHz at a rate of 20 times a second.
8. A system according to claim 1, wherein the UV unit (3) includes a
compartment with a number of glass tubes (19) installed therein, and a number of fluorescent UV tubes (20) installed inside the glass tubes (19).
9. A system according to claim 8, wherein the compartment includes a water inlet with a longitudinal protection cylinder (18), the protection cylinder having a wall that is solid in parts facing the glass tubes (19) and perforated else.
PCT/NO2012/050216 2011-11-07 2012-11-07 A system for cleaning ballast water WO2013070085A1 (en)

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NO20111528 2011-11-07

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016103165A3 (en) * 2014-12-21 2016-08-18 Tekno Sistemi Di Paolo Mumolo A method for treating water for use on a watercraft, and apparatus therefor
CN106698801A (en) * 2016-11-01 2017-05-24 徐铁刚 Sewage treatment device
CN107651789A (en) * 2017-10-23 2018-02-02 安徽野岭饮料食品有限公司 Scrape the production technology of water in a kind of Da Bie Mountain area
US10464821B2 (en) 2014-05-21 2019-11-05 B.V. Scheepswerf Damen Gorinchem System and method for cleaning and sterilizing a water flow

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WO1981002529A1 (en) * 1980-03-12 1981-09-17 White Light Ind Inc Magnetic water conditioner apparatus
EP1153889A1 (en) * 1999-12-03 2001-11-14 Kimihiko Okaue Clarification apparatus for liquid
JP2003154994A (en) * 2001-11-21 2003-05-27 Hokushin Sangyo Kk Device for preventing corrosion and adhesion of organism inside of ballast tank of vessel
KR20040066971A (en) * 2003-01-21 2004-07-30 김인수 Treatment of Ballast Water by Filtration UV Electrolysis Complex Disinfection Process
EP1710209A1 (en) * 2005-04-10 2006-10-11 Wolfgang Riggers Device for the reduction of germs in preferably optically transparent liquids by means of ultrasonic and ultraviolet irradiation
CN101108383A (en) * 2007-08-16 2008-01-23 刘利华 Remote digital type ultrasound wave/frequency conversion antiscaling descaling equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002529A1 (en) * 1980-03-12 1981-09-17 White Light Ind Inc Magnetic water conditioner apparatus
EP1153889A1 (en) * 1999-12-03 2001-11-14 Kimihiko Okaue Clarification apparatus for liquid
JP2003154994A (en) * 2001-11-21 2003-05-27 Hokushin Sangyo Kk Device for preventing corrosion and adhesion of organism inside of ballast tank of vessel
KR20040066971A (en) * 2003-01-21 2004-07-30 김인수 Treatment of Ballast Water by Filtration UV Electrolysis Complex Disinfection Process
EP1710209A1 (en) * 2005-04-10 2006-10-11 Wolfgang Riggers Device for the reduction of germs in preferably optically transparent liquids by means of ultrasonic and ultraviolet irradiation
CN101108383A (en) * 2007-08-16 2008-01-23 刘利华 Remote digital type ultrasound wave/frequency conversion antiscaling descaling equipment

Cited By (4)

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