WO2023139062A1 - Système et procédé de traitement des eaux de ballast - Google Patents

Système et procédé de traitement des eaux de ballast Download PDF

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Publication number
WO2023139062A1
WO2023139062A1 PCT/EP2023/051010 EP2023051010W WO2023139062A1 WO 2023139062 A1 WO2023139062 A1 WO 2023139062A1 EP 2023051010 W EP2023051010 W EP 2023051010W WO 2023139062 A1 WO2023139062 A1 WO 2023139062A1
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WO
WIPO (PCT)
Prior art keywords
water
filter
outlet
flow
subsystem
Prior art date
Application number
PCT/EP2023/051010
Other languages
English (en)
Inventor
William Harold BURROUGHS
Original Assignee
Bawat A/S
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 Bawat A/S filed Critical Bawat A/S
Publication of WO2023139062A1 publication Critical patent/WO2023139062A1/fr

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Classifications

    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • 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
    • 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
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • the invention relates to systems and methods for treatment of water, such as water from or to a vessel, such as ballast water from or to a vessel.
  • ballast tanks such as ships or other naval constructions, are usually provided with one or more ballast tanks configured to hold ballast water.
  • the amount of ballast water in one or more ballast tanks may be adjusted, e.g., by loading or discharging a desired amount of ballast water into or out of the one or more ballast tanks, e.g., from or to the surrounding water.
  • the purpose of ballast tanks is to enable the vessel to maintain/achieve a desired stability and/or a desired buoyancy and/or a desired center of gravity, etc.
  • the desired amount of ballast water within the one or more ballast tanks of a vessel may for instance depend on whether the vessel is carrying cargo, as well as the nature and amount of such cargo.
  • Water provided to a ballast tank of a vessel may be taken from the surrounding water, e.g., while at port, which water usually contains live microorganisms, such as various forms of plankton and bacteria, etc.
  • Vessels such as cargo vessels, may travel vast distances over the ocean, e.g., from one cargo port to another. Accordingly, when if a vessel is discharging untreated water from a ballast tank of the vessel, water containing live microorganisms, which water may originate from a distant part of the world, may be discharged into the surrounding water. Accordingly, such discharge of untreated water into the surrounding water may potentially introduce undesired living microorganisms, or an undesired amount hereof, into the marine environment of the location of the discharge. Live microorganisms from another part of the world may be a threat to the local marine life at the location of discharge.
  • ballast water discharged from a vessel complies with certain standards, such as defining one or more upper thresholds for the concentration of living microorganisms allowed in the discharged ballast water.
  • Such thresholds and/or standards may vary between different countries/regions and/or may change with time.
  • a required maximum concentration threshold level of microorganisms in the discharged ballast water may be obtained by treating the ballast water using a treatment applying appropriate techniques to reduce the content of live microorganisms prior to the discharge of ballast water, e.g., discharge to the surrounding water.
  • ballast water Various systems and methods for treatment of ballast water exist.
  • One example hereof is heat treatment, also known as "pasteurization”.
  • WO2018219429A1 discloses various systems and methods for heat treatment of ballast water and wastewater from hull cleaning.
  • ballast water examples comprise use of UV-light irradiation, i.e., UV treatment, or treatment by addition of chlorine containing substances.
  • the inventor of the present invention has realized a need for improved systems and methods for treatment of water such as ballast water.
  • a system for treatment of water such as ballast water or wastewater from hull cleaning of a vessel.
  • the system comprises a first subsystem and a second subsystem.
  • the first subsystem comprises a filter unit comprising a filter element, wherein the filter unit is configured to provide a filtrate and a filter-reject of a first flow of water.
  • the second subsystem comprises a heat treatment unit.
  • the heat treatment unit comprises a heat exchange section and a heat application section.
  • the heat exchange section is configured to exchange heat between a first heat exchange zone of a second flow of water comprising the filter-reject and a second heat exchange zone of the second flow of water.
  • the heat application section is configured to apply heat to the second flow of water at a heat application zone provided between the first heat exchange zone and the second heat exchange zone.
  • a method for treatment of water such as ballast water or wastewater from hull cleaning of a vessel.
  • the method comprises providing a filtrate and a filter-reject of a first flow of water.
  • the method comprises exchanging heat between a first heat exchange zone of a second flow of water comprising the filter-reject and a second heat exchange zone of the second flow of water.
  • the method comprises applying heat to the second flow of water at a heat application zone provided between the first heat exchange zone and the second heat exchange zone.
  • UV treatment may provide an advantage of being less energy consuming per treated volume of water than for instance heat treatment.
  • the compared ratio of efficiency may however depend on the quality of the water to be treated.
  • UV treatment may have an advantage of not requiring a holding time for the chemicals to have effect.
  • Both UV and heat treatment may have an advantage over chemical treatment, such as for instance treatment by addition of chlorine containing substances, of not being a potential chemical hazard for the environment at discharge.
  • Both UV treatment and treatment by addition of chlorine containing substances may require a pre-filtration for filtering larger particles containing living organisms that otherwise could survive such treatment.
  • Heat treatment may have the advantage of usually not requiring such filtration.
  • a filter may aid in removal of living microorganisms.
  • the filter usually needs to be cleaned to keep being operational.
  • a filter having a relatively small nominal pore size may allow for removal of more and smaller living organisms from the water. However, such filter may clog more easily, may have a higher need for cleaning, and may have lover relative throughput and/or a higher pressure drop during use.
  • a filterreject i.e., a fluid containing large particles, possibly including organic particles, which may be too large to be treated effective using for instance UV treatment, hence the need for the filter.
  • a known way to handle a filter-reject comprises dewatering and disposal of solids, e.g., by landfill.
  • the present invention may enable energy efficiency and/or a desired throughput while mitigating potential storage and/or problematic disposal of sediments from a filter.
  • the present invention may facilitate a less time-consuming and/or more economic water treatment compared to prior art solutions.
  • the present invention may facilitate improved energy efficiency and/or more cost effectiveness.
  • the invention relates to different aspects including the systems described above and in the following and to methods described above and in the following.
  • Each aspect may yield one or more of the benefits and advantages described in connection with one or more of the other aspects, and each aspect may have one or more embodiments with all or just some of the features corresponding to the embodiments described in connection with one or more of the other aspects and/or disclosed in the appended claims.
  • Fig. 1 schematically illustrates a first embodiment of a system according to the invention.
  • Fig. 2 schematically illustrates a heat treatment unit.
  • FIG. 3 schematically illustrates a second embodiment of a system according to the invention.
  • the terms upstream and/or downstream of a feature should be understood with regard to the fluid communication and/or the intended fluid communication between the respective parts/features during use.
  • the term "surrounding water” generally refers to the surrounding water of the vessel in question and may refer to a body of water within which the respective vessel is located, such as the water of a respective port within which the respective vessel is located.
  • system refers to the system for treatment of water according to the invention - unless explicitly stated otherwise.
  • the system may comprise a system inlet and at least one system outlet comprising a first system outlet.
  • the filter unit may comprise a filter inlet, a first filter outlet, and a second filter outlet.
  • the heat treatment unit may comprise a heat treatment inlet and a heat treatment outlet.
  • the system may comprise one of, more of, or all the following: a backpressure valve; and/or a first pump; and/or a first drive; and/or a first buffer tank; and/or a dechlorination unit; and/or a technical water supply; and/or a bypass line; and/or a system-reject line and a system-reject outlet.
  • the first subsystem may comprise a first treatment unit, e.g., comprising a UV-unit.
  • the second subsystem may comprise a second buffer tank.
  • the at least one system outlet may comprise the second system outlet.
  • the system inlet may be configured to receive the water, i.e., water for treatment, e.g., received from a first vessel. Accordingly, the system inlet may be configured for connection from the first vessel.
  • the system may comprise a system input valve, e.g., provided at the system inlet, e.g., for enabling isolation of the system before and during connection of the system inlet, e.g., with an output from the first vessel.
  • the at least one system outlet such as the first system outlet, may be configured to output treated water, i.e., water that has been treated by the first subsystem and/or by the second subsystem.
  • the at least one system outlet may be configured to output treated water from the first subsystem and the second subsystem.
  • the system may be configured for fluid communication from the system inlet to the at least one system outlet via the first filter outlet, and/or from the system inlet to the at least one system outlet via the second filter outlet and the heat treatment unit.
  • the first subsystem being may be configured to treat a first flow of water comprising at least part of the water received via the system inlet.
  • the first subsystem may be configured to provide a flow of treated water from the first flow of water.
  • the first subsystem may be configured to provide a flow of untreated water (or insufficiently treated water) from the first flow of water.
  • the second subsystem may be configured to treat a second flow of water comprising the filter-reject.
  • the second subsystem may be configured to provide a flow of treated water from the second flow of water.
  • the combined amount of treated water from the first subsystem and the second subsystem may correspond to the first flow of water. This may however depend on the system and/or on the operation of the system.
  • the system may be configured for a treatment rated capacity (TRC), e.g., as specified in a type-approval and/or certificate of the system.
  • TRC treatment rated capacity
  • the TRC may correspond with the capacity of the first pump and/or the capacity of the first flow of water.
  • the TRC may correspond to the combined capacity of the first subsystem and the second subsystem.
  • the second subsystem may be configured for a lower capacity than the first subsystem.
  • the capacity of the second subsystem may for instance be between 5 and 15 % of the capacity of the first subsystem, such as around 11 % of the capacity of the first subsystem. Accordingly, the second subsystem may be able to handle a continuous flow of filter-reject provided in case the filter unit configured for a continuous backflush of 10 % of the first flow.
  • the filter inlet may be configured to receive the first flow of water.
  • the first filter outlet may be configured to output the filtrate.
  • the second filter outlet may be configured to output the filter-reject.
  • the filter unit may aid in removal of living microorganisms during treatment of the first flow of water.
  • the filtrate may be regarded as treated water, e.g., if the nominal pore size of the filter unit is sufficiently small and in dependence of the definition of what is required for the water to be considered as treated water.
  • the filtrate may need to be treated, e.g., in the optional first treatment unit, for provision of treated water from an output from the first subsystem.
  • Treatment of the filtrate in the first treatment unit may prevent or inhibit large debris from entering the optional UV-unit, which otherwise could cause damage to sleeves hereof.
  • Treatment of the filtrate in the first treatment unit may prevent/inhibit larger organisms (e.g., larger than 50 pm, depending on the pore size) from entering the UV-unit, which organisms otherwise might not be killed sufficiently, i.e., to a sufficient extent.
  • Biological performance standard is often based on 50 pm organisms.
  • Filtration of the first flow of water normally necessitates cleaning of the filter unit in order to avoid clogging of the filter unit I the filter element. Accordingly, the filter unit may for instance be backwashed periodically or may be backflushed, which generates the filter- reject.
  • the filter-reject thus usually contains a considerably higher degree/amount of debris and large organisms than what is generally present in the first flow of water.
  • the filter-reject may be discharged from the first subsystem, e.g., to the second subsystem.
  • the filter- reject, as discharged from the first subsystem may be regarded as untreated water or insufficiently treated water.
  • the filtrate, as discharged from the first subsystem may be regarded as treated water or may need treatment for being regarded as treated water.
  • the heat treatment inlet may be configured to receive the second flow of water.
  • the heat treatment outlet may be configured to output the second flow of water.
  • the heat treatment unit may enable that the second flow of water is "treated water" when exiting the heat treatment unit.
  • the heat exchange section may enable that heat is recovered/regained after the heat treatment.
  • the heat exchange section may comprise a first part and a second part.
  • the first heat exchange zone may be provided by and/or may coincide with the first part of the heat exchange section.
  • the second heat exchange zone may be provided by and/or may coincide with the second part of the heat exchange section.
  • the heat application zone may be provided by and/or may coincide with the heat application section.
  • the first heat exchange zone of the second flow of water may be inbound to the heat application section and the second heat exchange zone of the second flow may be outbound from the heat application section.
  • the heat exchange section may be configured to preheat the second flow of water prior to applying heat in the heat application section by transfer of heat from the second flow of water having been heated at the heat application section. Transferring heat to the second flow of water before entering the heat application section by means of the second flow of water coming from the heat application section may be advantageous. Accordingly, the heat exchange section may be configured to pre-heat incoming water of the heat treatment unit by recovering heat from outgoing water of the heat treatment unit.
  • the system may be configured to provide fluid communication from the first filter outlet towards the first system outlet and from the heat treatment outlet towards the at least one system outlet.
  • the system may be configured to and/or the method may comprise treating water, wherein the treatment is in compliance with the IMO criteria for ballast water discharge and/or is utilizing a system awarded Type Approval from the US Coast Guard, e.g., such that treated water meets the Ballast Water Performance Standard in Regulation D-2 of the BWM Convention and/or another standard or threshold.
  • Treated water such as treated ballast water, may be defined and/or understood as water that meets the Ballast Water Performance Standard in Regulation D-2 of the BWM Convention and/or another standard or definition.
  • a standard may for instance be defined in terms of any one or more of the following: less than 10 viable organisms per m 3 which are greater than or equal to 50 pm in minimum dimension; less than 10 viable organisms per ml which are between 10 pm and 50 pm in minimum dimension; less than 1 colony-forming unit (cfu) per 100 ml of Toxicogenic Vibrio cholerae; less than 250 cfu per 100 ml of Escherichia Coli; and less than 100 cfu per 100 ml of Intestinal Enterococci.
  • Untreated water (or insufficiently treated water) may be defined and/or understood as water that does not meet the Ballast Water Performance Standard in Regulation D-2 of the BWM Convention.
  • untreated water may alternatively or additionally refer to water, which has not been treated during intake by the vessel or while being contained by the vessel. Accordingly, any ballast water which is contained, is about to be contained, or has been contained by a vessel, and which has not been treated according to an approved method or system for treatment of ballast water, may be denoted "untreated ballast water” irrespectively of whether the respective water meets the Ballast Water Performance Standard in Regulation D-2 of the BWM Convention and/or another standard or none such standard.
  • ballast water may refer to water that is about to be contained by, or has been contained by, one or more ballast tanks of a vessel, e.g., the vessel in question.
  • the filter unit may be backflushable. Backflushing may provide the filter- reject. Alternatively, or additionally, the filter unit may be backwashable for provision of the filter-reject.
  • the system may be configured for and/or the method may comprise backflushing of the filter unit for provision of the filter-reject. Alternatively, or additionally, the system may be configured for and/or the method may comprise backwashing of the filter unit for provision of the filter- reject.
  • Backflushing of a filter may be regarded as a "self-cleaning" action, wherein the filter is backflushed by means of post-filtered water being reverse flowed through one or more areas/zones of the filter element, wherein the areas/zones usually are in motion to backflush all parts of the filter element over a period. During backflush, the filter is still in operation at, e.g., 90% throughput.
  • An advantage of backflushing may be that the filtrate and the filter-reject may be provided simultaneously from the filter unit, i.e., the filter unit may be cleaned while providing the filtrate.
  • the optional first pump may be provided upstream of the filter unit and/or between the system inlet and the filter inlet.
  • the first pump may be configured to provide and/or drive and/or boost the first flow of water, such as from the first buffer tank.
  • the first pump may be a booster pump.
  • the first pump may have a capacity of at least of at least 100 m 3 /h, e.g., between 100 and 1000 m 3 /h.
  • the first pump may have a capacity of around 1000 m 3 /h, such as 1000 m 3 /h plus/minus 20%.
  • the capacity of a pump may refer to the volumetric flow rate, such as the maximum volumetric flow, which the pump can generate during use.
  • the optional first drive may be configured to drive and/or control the first pump.
  • the first drive may be or comprise a variable frequency drive, VFD.
  • Controlling a pump may include controlling the generated pressure/flowrate.
  • the VFD may be controlled to automatically control water level in the first buffer tank.
  • the VFD may enable the first pump to accommodate the pressure I provided flow I first flow according to needs, e.g., to slow down, e.g., to minimum required flow of the system, and speed up to, e.g., maximum capacity of the system. Additionally, or alternatively, the VFD may enable an automatic pressure source for backflushing of the filter unit.
  • a VFD may be desired because of a need to control the pressure to be generated by the first pump, e.g., due to backflushing needs and/or a need for setting and/or adjusting the flowrate of the first flow to handle the supply of water (e.g., ballast water) to be treated, e.g., as provided via the system inlet to the first buffer tank.
  • water e.g., ballast water
  • the VFD drive may be automated to increase inlet pressure to and/or the backpressure valve may be controlled.
  • the VFD may be dialed back to provide flow control (e.g., based on a flow meter/totalizer in the system) for treatment rate control.
  • the flow rates provided to the system may diminish (e.g., ship operation may fluctuate). Accordingly, the VFD may dial down flow rate to prevent emptying the first buffer tank. For prevent shutting down the UV-unit it may be needed to let the VFD dial down to minimum flow/treatment rate. This may be in anticipation of ship operations increasing flow to the first buffer tank.
  • the system e.g., the first subsystem, e.g., the filter unit, may comprise a backpressure valve.
  • the optional backpressure valve may be provided between the first filter outlet and the first system outlet and/or may be provided downstream of the filter unit.
  • the backpressure valve may be configured to control passage of the filtrate from the filter unit and/or may be configured to control passage of fluid comprising the filtrate from the first filter outlet towards the first system outlet.
  • the backpressure valve may be an automated and/or a variable position valve.
  • a variable position valve such as optionally the backpressure valve, may be a butterfly valve, e.g., a butterfly valve with SharktoothTM and/or SharkFin inserts, e.g., as provided by "Yeary Controls" www.yearycontrols.com
  • Backpressure may be provided by a closing action of the backpressure valve, wherein the passage may be reduced, thereby narrowing the passage.
  • the backpressure valve may be configured to provide sufficient backpressure on the filter unit for proper cleaning performance.
  • the backpressure valve may function as an isolation valve of the filter unit, e.g., between the filter unit and optional first treatment unit.
  • the system may be configured to backflush the filter unit by generating and/or controlling, e.g., increasing, a suitable differential pressure over the filter element, e.g., from the first filter outlet towards the second filter outlet and/or from the filtrate towards a filter-reject side of the filter element.
  • the system may be configured to backflush the filter unit by controlling the first pump and/or by controlling the backpressure valve.
  • the first pump may be controlled via the first drive, e.g., VFD.
  • Backflushing may be initiated and/or the ratio of backflushing may be controlled in response to measurement and/or estimation of pressure drop over the filter element.
  • the pressure drop may be monitored/estimated using one or more pressure detectors, e.g., at inlet and/or outlet of the filter unit.
  • backflushing may be carried out at regular intervals, e.g., in dependence of measurements of the quality of the water provided to the filter unit.
  • filter- reject e.g., around 10 %, depending on the filter unit.
  • the backflushing may be active, for instance for 1 minute duration every 5-10 minute or every 2-3 minute or continuously for relatively dirty water.
  • the system may comprise one or more pressure detectors.
  • the system may comprise a filter input pressure detector and/or a filter output pressure detector, which may be utilized for detecting and/or estimating a differential pressure across the filter unit, for instance to automatically backflush the filter unit.
  • Pressure across the filter unit may be understood as: the pressure between the filter inlet and the first filter outlet, and/or the pressure difference over the filter element between the pre-filtered first flow and the filtrate.
  • Backflushing may be carried out automatically in response to input from one or more pressure sensors. For instance, when differential pressure across the filter using pressure instruments (cf. e.g., ref. 43c, 43d) indicate excessive clogging of filter, the automation system may automatically backflush the filter.
  • pressure instruments cf. e.g., ref. 43c, 43d
  • the first subsystem may comprise a filter-reject valve, e.g., provided at the second filter outlet.
  • the filter-reject valve may be an automatic valve.
  • the filter-reject valve may enable isolation from the first subsystem towards the second subsystem.
  • the filter-reject valve may be operated between an open and a closed position depending on whether the backflushing is to be active or not. Accordingly, the filterreject valve may be in an open position to allow the filter-reject to be provided to the second subsystem, e.g., to the second buffer tank. The filter-reject valve may be in a closed position to ensure that the filter unit does not backflush unintentionally.
  • the system may comprise a first flowmeter, e.g., provided downstream of the first pump, e.g., for feedback of measurement of flow to the first drive, e.g., for controlling the first flow provided to the filter unit.
  • the first flowmeter may comprise a totalizer, e.g., for tracking/handling needs for service resulting from treatment volume.
  • the first subsystem may comprise a filter input valve that may enable equipment to be isolated for maintenance and repair and may isolate (at least in part) the first subsystem from the second subsystem.
  • the filter element may have nominal pore size of between 10 and 50 pm, such as between 15 and 25 pm, such as about 20 pm, e.g., plus/minus 20%.
  • the filter element may have a nominal pore size of 80 pm or smaller, such as 50 pm or smaller, such as 25 m or smaller.
  • the filter element may have a nominal pore size of 10 pm or larger, such as 15 pm or larger.
  • the optional first treatment unit may be provided downstream of the filter unit and/or between the first filter outlet and the first system outlet.
  • the first treatment unit may be configured to treat the filtrate of the first flow, e.g., by irradiation and/or chemical treatment.
  • the first treatment unit may comprise a UV-unit, e.g., utilizing a single UV chamber.
  • the UV-unit may be configured to treat the water by irradiation of UV-light.
  • the UV- unit may be operating and/or may be configured to be operating at or close to 100% UVI/power.
  • the first subsystem may comprise a circulation loop for circulating water of the first treatment unit, such as of the UV-unit, e.g., from an output of the first treatment unit to an input thereof.
  • the circulation loop may be provided as an integral part of the first treatment unit, e.g., of the UV-unit.
  • the circulation loop may be operated during startup and/or shutdown of the first treatment unit, e.g., the UV-unit.
  • the circulation loop may comprise a circulation pump and optionally one or more valves, such as a circulation input valve and/or a circulation output valve.
  • the circulation input valve and/or the circulation output valve may be a 2-position valve and/or may be automated.
  • the first subsystem may be configured for circulation of water within the UV-unit for an initial phase and/or for a terminal phase, i.e., prior, and subsequent to a treatment operation. Additionally, or alternatively, the first subsystem may be configured for circulation of water within the UV-unit for a standby phase, e.g., for awaiting water reception and/or accumulation of water in the first buffer tank. It may be needed to circulate water through the UV-unit during an initial phase for cooling the UV-lamps while they reach operational level, e.g., operational temperature. It may be needed to circulate water through the UV-unit during a terminal phase for cooling the UV-lamps after being turned off.
  • the optional first buffer tank may be provided upstream of the filter unit and/or between the system inlet and the filter inlet.
  • the first buffer tank may be denoted a "surge tank".
  • the first buffer tank may be for receiving water to be treated, such as for receiving ballast water from a first vessel.
  • the first buffer tank may mitigate potential issues that otherwise could occur when the supply/reception of water to be treated via the system inlet is not constant. For instance, when receiving ballast water from a first vessel, the ballast water may be delivered via a hose that may collapse. The risk of collapsing such hose and/or the potentially negative impact of the system in case the hose collapses may be lessened by means of the first buffer tank.
  • the first buffer tank may provide sufficient time to dial up/down the rate of treatment of the first subsystem and/or the second subsystem in response to the supply of water to be treated.
  • the first buffer tank may even out fluctuations in the input, i.e., the supply of water to be treated as received via the system inlet.
  • the first buffer tank may comprise an outlet provided at a bottom part of the tank. This may facilitate automatic and complete drainage of the tank.
  • the system may comprise a valve at the outlet of the first buffer tank, denoted "first buffer tank output valve". This may enable removal I repair I replacement of for instance the first pump, e.g., without any need to drain the first buffer tank.
  • the first buffer tank may have a volume of between 4 and 30 m 3 , such as between 10 and 20 m 3 , such as around 15 m 3 .
  • the first buffer tank may have a cylindrical sidewall.
  • the first buffer tank may have a conical bottom, e.g., right circular with a base above vertex, for cleaning purposes, e.g., for enabling self-cleaning, at least to some extent.
  • the first buffer tank may be made in or comprise polyethylene, alternatively fiberglass. It is usually desired that the first buffer tank is durable, and/or is capable of handling chlorine, and/or is electrically non-conductive.
  • the optional dechlorination unit may be configured to neutralize or decrease residual chlorine in the water, e.g., in the water received via the system inlet.
  • the dechlorination unit may be configured to provide/direct a neutralization agent to/towards the first buffer tank.
  • the neutralization agent may comprise sodium bisulfite and/or metabisulfite
  • the dechlorination unit may comprise a dissolving/mixing tank, e.g., with a mixer/stirrer, for mixing the neutralization agent with water and/or for stirring the tank.
  • a chlorine neutralization agent may for instance be needed if the water received for being treated is from a vessel, wherein treatment using chlorine has failed.
  • the mixing tank may have a volume of 1 m 3 or around that.
  • the dechlorination unit may comprise a neutralization pump, e.g., configured for variable output, for instance based on: enabled if inlet water quality sensor (cf. e.g. ref. 43a on Fig. 1) senses chlorine in the received water to be treated, e.g., coming from a vessel; rate controlled by chlorine sensor (cf. e.g. ref. 43e on Fig. 1) to provide complete neutralization using sodium bisulfite. Injection rate of the neutralization agent to, e.g., the first buffer tank may be controlled by the outlet water quality monitor. The neutralization agent may be injected at an inlet to buffer tank.
  • inlet water quality sensor cf. e.g. ref. 43a on Fig. 1
  • chlorine sensor cf. e.g. ref. 43e on Fig.
  • Injection rate of the neutralization agent to, e.g., the first buffer tank may be controlled by the outlet water quality monitor.
  • the neutralization agent may be injected at an inlet
  • the dechlorination unit may be configured for periodically adding dry chemicals to make more aqueous solution of sodium bisulfite for neutralization.
  • the dechlorination unit may comprise a dechlorination input valve at the inlet of the unit and a dechlorination output valve at the outlet of the unit.
  • the dechlorination input valve may be for isolation and for enabling technical water to the tank.
  • the dechlorination output valve may be configured to shut off if no chlorine is detected in the water to be treated.
  • the optional technical water supply may comprise or consist of a container or tank for holding technical water.
  • the volume may for instance be 1 m 3 or around.
  • Technical water may comprise potable and/or non-potable water.
  • the technical water of the technical water supply may be drawn from a public water source. This may for instance be carried out when a vessel, such as a tug, with the system is in port, e.g., before departing to attend a/the first vessel, e.g., for treatment of ballast water of the vessel.
  • the system may be configured to provide technical water from the technical water supply to the filter unit, e.g., for cleaning of the filter unit e.g., after draining of the filter unit and/or for initial fill of the filter.
  • the system may be configured to provide technical water from the technical water supply to the dechlorination unit, e.g., for dissolving and/or diluting a/the neutralization agent, which may be contained by the dechlorination unit, wherein the neutralization agent may comprise dry sodium metabisulfite and/or sodium bisulfite.
  • the optional second buffer tank may be for receiving water including the filter-reject to be treated by the second subsystem.
  • the second buffer tank may mitigate potential issues that otherwise could occur when the supply/reception of water to be treated is not constant, which often is the case when receiving a filter- reject, e.g., unless backflushing is operated at a constant level.
  • the potentially negative impact of the system when receiving a non-constant supply of water to be treated may be lessened by means of the second buffer tank.
  • the second buffer tank may provide sufficient time to dial up/down the rate of treatment of the first subsystem and/or the second subsystem in response to the supply of water to be treated.
  • the second buffer tank may even out fluctuations in the input, i.e., the supply of water to be treated by the second subsystem.
  • the second buffer tank may comprise an outlet provided at a bottom part of the tank. This may facilitate automatic and complete drainage of the tank.
  • the second subsystem may comprise a valve at the outlet of the second buffer tank, denoted "second buffer tank output valve". This may enable removal I repair / replacement of for instance the second pump, e.g., without any need to drain the second buffer tank.
  • the second buffer tank may have a volume of between 1 and 5 m 3 , such as around 2 m 3 .
  • the second buffer tank may have a cylindrical sidewall.
  • the second buffer tank may have a conical bottom, e.g., right circular with a base above vertex, for cleaning purposes, e.g., for enabling self-cleaning, at least to some extent.
  • the second buffer tank may be made in or comprise polyethylene, alternatively fiberglass. It is usually desired that the second buffer tank is durable and/or is electrically non-conductive.
  • the second buffer tank may be provided between the second filter outlet and the heat treatment unit and/or provided upstream of the heat treatment unit and/or downstream of the filter unit.
  • the second buffer tank may be configured to receive the filter-reject.
  • the filter-reject may be directed to the second buffer tank.
  • the second buffer tank my facilitate control of startup/shutdown of the heat treatment unit and may provide time for equipment dial up I dial down capacity and optionally retreatment of water to heat treatment unit.
  • the second subsystem may be configured for providing the second flow of water from the second buffer tank towards the heat treatment unit.
  • the second subsystem may comprise a second pump.
  • the second pump may be configured to provide and/or drive and/or boost the second flow of water.
  • the second pump may be a booster pump.
  • the second flow of water may be from the second buffer tank, through the heat treatment unit, and towards the at least one system outlet.
  • the system may be configured for a capacity of the second flow of 100 m 3 /h.
  • the second subsystem may comprise a "heat treatment input valve" provided at the heat treatment inlet.
  • the heat treatment input valve may be configured to control the second flow, e.g., in combination with controlling the second pump or wherein the second pump is operated at a constant level.
  • the heat treatment input valve may be a variable position valve, e.g., configure to throttle flow from the second buffer tank based on levels and/or configured to control flow (the second flow) to heat treatment unit, e.g., via an adjustable pressure drop.
  • the second pump may be configured for on-off control.
  • the second subsystem may comprise a second flowmeter for measuring and/or controlling the second flow to the heat treatment unit. Output from the second flowmeter may be utilized for controlling second flow for instance by controlling the second pump and/or the heat treatment input valve.
  • the second flowmeter may comprise a totalizer, e.g., for tracking/handling needs for service resulting from treatment volume.
  • the fluid communication from the heat treatment outlet towards the at least one system outlet may comprise fluid communication from the heat treatment outlet towards the first system outlet and/or from the heat treatment outlet towards a second system outlet, wherein the at least one system outlet may comprise the second system outlet.
  • the optional bypass line may be configured to provide fluid communication to the second subsystem, e.g., bypassing the first subsystem.
  • the fluid communication to the second subsystem may be from/via the system inlet and/or from/via the first buffer tank.
  • the fluid communication may be to the second buffer tank.
  • the optional first buffer tank may be provided upstream of the second buffer tank - enabled by the bypass line.
  • the bypass line may comprise a bypass valve, e.g., for regulating a flow through the bypass line, e.g., provided utilizing the first pump.
  • the bypass valve may be an automatic valve, e.g., for controlling feed of water towards the second subsystem I the second buffer tank / the heat treatment unit.
  • Provision of a system with the bypass line and/or provision of fluid communication from the from the first buffer tank to the second buffer tank bypassing the filter unit may provide one or more of the following options and/or advantages.
  • a malfunction of the filter unit may be less critical if the system is configured such that the second subsystem is capable of treating water without usage of the first subsystem and/or the filter unit. Accordingly, appropriate measures, such as repair of the filter unit, may be managed in due time. It may be controlled whether the system is to treat all water (e.g., as received via the system inlet) using only the second subsystem or all of it via the filter unit of the first subsystem and thus only the filter-reject via the second subsystem. Alternatively, water to be treated may be provided directly to both the first subsystem and the second subsystem simultaneously according to a desired ratio. Furthermore, it may be possible to pre-fill the heat treatment unit with water from the first buffer tank when starting the system.
  • a choice of ratio of water to the first and second subsystems may for instance depend on the quality of the water to be treated. For instance, if the UVT and/or TSS of the water is very unfavorable for the first subsystem, a high or higher amount of the water may be directed directly to the second subsystem.
  • the optional system-reject line and a system-reject outlet may be for enabling discharge of the filter- reject, e.g., in case it is allowed to discharge the filter-reject without any treatment prior to the discharge.
  • the system may be configured to discharge the filter-reject, e.g., bypassing the second subsystem and/or the heat treatment unit.
  • the system-reject line may be configured to provide fluid communication from the second filter outlet to the system-reject outlet. For instance, if ballasting a first vessel using water from the surrounding water, the filter-reject may be returned to surrounding water, e.g., via the system-reject line and systemreject outlet.
  • the system may be configured to treat water from a first vessel, e.g., from one or more ballast tanks of the first vessel.
  • the system may be configured to treat water to be provided to a/the first vessel, e.g., to one or more ballast tanks of the vessel.
  • the system may be provided outside the first vessel, such as at a port such as at a quay. Alternatively, or additionally, the system may be provided at least in part, such as completely, in one or more containers, such as one or more intermodal containers. Alternatively, or additionally, the system may be provided on a second vessel, such as on a barge. Alternatively, or additionally, the system may be provided at a port reception facility. Alternatively, or additionally, the system may be provided as a ballast water reception (BWR) facility, e.g., as a trailer-mounted BWR facility.
  • BWR ballast water reception
  • the system may be configured to treat wastewater from hull cleaning of the first vessel and/or ballast water coming from the first vessel and/or ballast water to be provided to the first vessel. Treatment of ballast water, e.g., using the system, may be carried out during ballasting and/or during de-ballasting.
  • the system may comprise one or more sample facilities, e.g., comprising a system inlet sample facility provided at the system inlet and/or a system outlet sample facility provided at the first system outlet.
  • the system may comprise a first subsystem outlet sample facility provided at an outlet of the first subsystem leading to the first system outlet, and/or a second subsystem outlet sample facility provided at an outlet of the second subsystem leading to the at least one system outlet.
  • a sample facility may be/comprise a Guidelines G2 sampling facility, cf. IMO BWM Convention Guidelines (G2).
  • G2 sampling facility cf. IMO BWM Convention Guidelines (G2).
  • a sample facility may double as a water sample for: biological organisms, sampling to prevent killing organisms during sampling, and general water collection for lab sample analysis.
  • the system may comprise one or more water quality sensors, e.g., comprising a system input water quality sensor, e.g., provided at the system inlet, and a system output water quality sensor, e.g., provided at the first system outlet.
  • a water quality sensor such as the system input water quality sensor, may be hotstick capable, i.e., enabling removal and insertion while the system is in operation to prevent spills/leaks.
  • the system input water quality sensor may for instance comprise a set of inlet water quality instruments, e.g., comprising sensor(s) for one of, more of, or all the following: temperature; total suspended solids (TSS); UV transmittance (UVT); pH; and free available chlorine - Ch (FAC).
  • the system output water quality sensor may for instance comprise a set of outlet water quality instruments, e.g., comprising sensor(s) for one of, more of, or all the following: temperature, TSS, and FAC.
  • the one or more water quality sensors may be utilized for controlling various aspects of the system. For instance, measurement of FAC may be input for controlling the dechlorination unit.
  • the system may comprise a system of conduits I piping I lines for enabling the flow of water between the various features of the system.
  • the first subsystem may comprise a first subsystem output valve, e.g., a 2-position (open/close) and/or automated valve.
  • the valve may enable output of treated water from the first subsystem towards the first system outlet.
  • the valve may be provided as an isolation valve of the first subsystem and/or of the filter unit and/or of the first treatment unit, e.g., for shutdown/maintenance, etc.
  • the system may be configured for closing the first subsystem output valve when operating the circulation pump.
  • the second subsystem may comprise a second subsystem output valve, e.g., a 2-position (open/close) valve.
  • the valve may enable output of treated water from the second subsystem towards the at least one system outlet.
  • the valve may be provided as an isolation valve of the second subsystem and/or of the heat treatment unit.
  • the valve may be provided as a manual valve.
  • the valve may be configured to isolate the second subsystem and/or the heat treatment unit, e.g., for shutdown/maintenance, etc.
  • the first subsystem may comprise a first return flow line and a first return flow valve e.g., a 2-position (open/close) and/or automated valve, for enabling a return flow from the first subsystem, e.g., from the UV-unit, towards the system inlet and/or towards the first buffer tank.
  • a first return flow valve e.g., a 2-position (open/close) and/or automated valve, for enabling a return flow from the first subsystem, e.g., from the UV-unit, towards the system inlet and/or towards the first buffer tank.
  • This may enable returning water for retreatment, e.g., water known to not be properly treated and/or for flushing the system if desired.
  • the received flow of ballast water e.g., provided to the first buffer tank
  • the received flow of ballast water may be stopped/paused for variable periods of time, for instance due to the cargo operations of the first vessel, e.g., waiting for cargo loading, or changing ballast tank suctions, etc.
  • the treatment rate of the UV-unit may be dialed up as the vessel increases/re-initiate the de-ballast rate.
  • the second subsystem may comprise a second return flow line and a second return flow valve, e.g., a 2-position (open/close) and/or automated valve.
  • the valve and connecting line may enable return of output from heat treatment unit to second buffer tank, e.g., in case of insufficient treatment.
  • the system may comprise one or more vents, e.g., with a connected valve.
  • the first buffer tank and/or the second buffer tank may have a secure lid to prevent sloshing. Accordingly, it may be needed that the first buffer tank and/or the second buffer tank comprises a vent.
  • the UV-unit may comprise a vent for filling/draining of the UV-unit. Such vent may enable pre-filling of the filter while venting air/purging air to avoid slug of air and damage to filter elements.
  • the UV-unit may comprise an isolation valve at the vent of the for the filling/draining of the UV-unit. The valve may be manually opened by procedure when filling the UV-unit and may be manually shut when water issues after all air escapes.
  • the system e.g., the first subsystem, may comprise a Water Hammer arrestor, e.g., provided at a high point of the piping system to trap air to absorb/mitigate hydraulic transients that would otherwise occur when air is compressed during a transition from zero-gauge pressure to full operating pressure. This may be particularly relevant for the UV-unit for avoiding bulb breakage of the UV-unit.
  • a Water Hammer arrestor e.g., provided at a high point of the piping system to trap air to absorb/mitigate hydraulic transients that would otherwise occur when air is compressed during a transition from zero-gauge pressure to full operating pressure. This may be particularly relevant for the UV-unit for avoiding bulb breakage of the UV-unit.
  • the second subsystem may comprise a second system inlet, e.g., for suction from surrounding water and/or river/ambient water. This may enable pre-filling of the second buffer tank and/or of the heat treatment unit, e.g., for startup, e.g., before receiving any water to be treated via the system inlet and/or via the first buffer tank, e.g., ballast water from a vessel being serviced. It may be desired to pre-start the heat treatment unit, e.g., prior to starting the first treatment unit, such as the UV- unit. Alternatively, or additionally, water from the second system inlet may be utilized for prefilling the first buffer tank.
  • a second system inlet e.g., for suction from surrounding water and/or river/ambient water.
  • All equipment is drained and rinsed periodically and/or after operation of the system. All rinse water may be sent to the heat treatment unit for treatment. Accordingly, the heat treatment unit may be the first to be started and/or the last to be shut down during operation of the system.
  • the method comprises draining water from the first subsystem or at least from the filter unit and/or from the first treatment unit, such that the first subsystem and/or the respective unit(s) enter a drained state.
  • the system is configured to drain water from the first subsystem or at least from the filter unit and/or from the first treatment unit, enabling the first subsystem and/or the respective unit(s) to enter a drained state. Draining water from the first subsystem, such as from the filter unit and/or from the first treatment unit, may for instance be carried out periodically and/or in connection with a shutdown of the first subsystem, for instance carried out prior to a shutdown of the second subsystem.
  • Draining water from the first subsystem may limit undesired growth of organisms within the first subsystem, such as within the filter unit and/or within the first treatment unit.
  • Water drained from the first subsystem such as from the filter unit and/or from the first treatment unit, may be provided to the heat treatment unit for treatment, e.g., provided via the first buffer tank and/or via the second buffer tank.
  • the first subsystem or at least the filter unit may be rinsed, for instance using technical water from the technical water supply.
  • Rinsing may comprise and/or may be understood as cleaning and/or flushing.
  • Rinsing may imply that the rinse water, i.e., the water used for rising, is drained from the system/unit(s) being rinsed when the rinsing is being completed.
  • the rinsing of the first subsystem, or at least the filter unit may be carried out on an initially drained first subsystem I an initially drained filter unit.
  • the rinse water may be provided to the heat treatment unit for treatment.
  • the first subsystem and/or at least the filter unit may be in a drained state after being rinsed and/or before being rinsed.
  • the first return flow line and/or the first buffer tank may be utilized for providing water, such as the rinse water and/or the drained water, from the first subsystem to the heat treatment unit.
  • the second filter outlet may be utilized for providing water, such as the rinse water and/or the drained water, from the first subsystem to the heat treatment unit.
  • the system may comprise a control system configured to control one or more parts of the system, such as one or more valves and/or one or more pumps and/or one or more drives.
  • the control may be carried out in response to input from one or more sensors of the system.
  • the method according to the invention may comprise use of such control system.
  • Heat treatment of water e.g., ballast water, may comprise heating the water to an appropriate temperature and keeping the water at the appropriate temperature, or close thereto, for an appropriate amount of time.
  • a treatment system configured for heat treatment may be denoted "heat treatment unit".
  • the heat treatment unit 2 may comprise a heat treatment inlet 4 and a heat treatment outlet 10.
  • the heat treatment unit 2 may comprise a heat application section 8 configured for applying heat to the water, such that the water that is flowing through the heat application section 8 is heated.
  • the heat treatment unit 2 may comprise a heat exchange section 6 configured for recovering heat from the heated water, the heat exchange section 6 may comprise a first part 7a and a second part 7b configured for exchanging heat from one part to the other.
  • the heat treatment unit 2 may comprise a treatment piping system 3 coupling the heat treatment inlet 4 to the heat treatment outlet 10 via: the first part 7a of the heat exchange section 6; the heat application section 8; and the second part 7b of the heat exchange section 6.
  • the heat treatment unit 2 may provide/enable that the water may flow from the heat treatment inlet 4 to the first part 7a of the heat exchange section 6.
  • the heat treatment unit 2 may provide/enable that the water may flow from the first part 7a of the heat exchange section 6 to the heat application section 8.
  • the heat treatment unit 2 may provide/enable that the water may flow from the heat application section 8 to the second part 7b of the heat exchange section 6.
  • the heat treatment unit 2 may provide/enable that the water may flow from the second part 7b of the heat exchange section 6 to the heat treatment outlet 10. Accordingly, the heat treatment unit 2 may provide/enable the second flow through the following: the first part 7a of the heat exchange section 6; the heat application section 8; and the second part 7b of the heat exchange section 6.
  • the heat exchange section 6 may be configured for exchanging, i.e., transferring, heat such that the water, which is flowing through the second part 7b of the heat exchange section 6, is pre-heating the water, which is flowing through the first part 7a of the heat exchange section 6. Accordingly, heat may be recovered.
  • the heat exchange section 6 may comprise: a primary inlet 6a; a primary outlet 6b; a secondary inlet 6c; and a secondary outlet 6d.
  • the primary outlet may be coupled to the secondary inlet via the heat application section 8.
  • the primary inlet may be coupled to the heat treatment inlet 4 of the treatment system.
  • the secondary outlet may be coupled to the heat treatment outlet 10 of the treatment system.
  • the heat exchange section 6 may comprise a heat exchanger. Any heat exchanger being provided and/or utilized according to the invention may comprise a plate heat exchanger.
  • Water which is flowing from the heat treatment inlet 4 towards the heat application section 8, may be pre-heated prior to entering the heat application section 8 by means of the heat exchange section 6. Accordingly, less heat may need to be applied to the water within the heat application section 8 for heating the water to a desired temperature than if the water is not pre-heated by such heat exchange section 6 prior to entering the heat application section 8.
  • the heat treatment unit 2 may comprise a detention section 9 (or retention section).
  • the treatment piping system 3 may be coupling the heat treatment inlet 4 to the heat treatment outlet 10 via the detention section 9. Accordingly, the water may flow from the heat application section 8 to the second part 7b of the heat exchange section 6 via the detention section 9.
  • the detention section 9 may be configured for detaining and/or retaining the water flowing (i.e., the second flow) through the detention section 9 for a pre-determined average detention/retention time by having the heated water, which is flowing from the heat application section 8 to the heat exchange section 6, being detained, such that the heated water is kept heated for the pre-determined average detention time.
  • the step of providing the second flow of the water from the heat treatment inlet 4 towards the heat treatment outlet 10 may comprise providing the flow via a detention section 9.
  • the method according to the invention may comprise detaining the water at the detention section 9 for a predetermined average detention time by having the heated water, which is flowing from the heat application section 8 towards the heat exchange section 6, being detained, such that the heated water is kept heated for the pre-determined average detention time.
  • the detention section 9 may be provided by means of a water container.
  • the average detention time may for instance be at least 30 seconds, such as at least 60 seconds.
  • the desired temperature and time may be related to each other.
  • the average detention time may for instance be controlled by the flow rate and/or by the type and/or setting of the detention section 9.
  • the heat treatment unit 2 may comprise a heat treatment pump, such as the heat treatment pump 12.
  • the heat treatment pump 12 may be configured for providing the second flow water from the heat treatment inlet 4 towards the heat treatment outlet 10.
  • a system comprising the heat treatment pump 12 may be void of the optional second pump or vice versa.
  • the heat treatment unit 2 may comprise a mode valve system 18, e.g., comprising the valves 18a, 18b, and 18c, for enabling water to be circulated via a heat circulation valve 18b from the second part 7b of the heat exchange second 6 to the first part 7a of the heat exchange section 6. This may, e.g., be utilized during warmup of the heat treatment unit.
  • a mode valve system e.g., comprising the valves 18a, 18b, and 18c, for enabling water to be circulated via a heat circulation valve 18b from the second part 7b of the heat exchange second 6 to the first part 7a of the heat exchange section 6. This may, e.g., be utilized during warmup of the heat treatment unit.
  • the water e.g., of the first vessel, may be heated at the heat application section 8, such that the water reaches a desired temperature.
  • the method may comprise heating the water at the heat application section 8, such that the water reaches a desired temperature.
  • the desired temperature may for instance be at least 60 °C, at least 65 °C, at least 70 °C, at least 75 °C, at least 80 °C, at least 85 °C, or at least 90 °C.
  • the heat treatment unit 2 may comprise a boiler and/or another source of heat for applying heat to the water in the heat application section.
  • the heat treatment unit 2 may comprise one or more temperature sensors 22a, 22c, e.g., for controlling the flow rate through the unit 2 and/or for controlling the application of heat to the flow of water within the heat application section 8.
  • Fig. 1 schematically illustrates a first embodiment of a system 1 according to the invention.
  • the system 1 comprises: a system inlet 27 configured to receive water for treatment, a first subsystem 3, a second subsystem 5, and at least one system outlet 71 comprising a first system outlet 51.
  • the first subsystem 3 is configured to treat a first flow of water comprising at least part of the water received via the system inlet 27.
  • the first subsystem 3 comprises a filter unit 25 comprising: a filter inlet 59, a filter element, a first filter outlet 55, and a second filter outlet 57.
  • the filter unit 25 is configured to provide a filtrate and a filter-reject of the first flow of water.
  • the filter inlet 59 is configured to receive the first flow of water.
  • the first filter outlet 55 is configured to output the filtrate.
  • the second filter outlet 57 is configured to output the filter-reject.
  • the second subsystem 5 is configured to treat a second flow of water comprising the filter-reject.
  • the second subsystem 5 comprises a heat treatment unit 2 comprising: a heat treatment inlet 4, a heat exchange section 6 (cf. Fig. 2), a heat application section 8 (cf. Fig. 2), and a heat treatment outlet 10.
  • the heat treatment inlet 4 is configured to receive the second flow of water.
  • the heat exchange section 6 is configured to exchange heat between a first heat exchange zone of the second flow of water and a second heat exchange zone of the second flow of water.
  • the heat application section 8 is configured to apply heat to the second flow of water at a heat application zone provided between the first heat exchange zone and the second heat exchange zone.
  • the heat treatment outlet 10 is configured to output the second flow of water, wherein the output may be treated water.
  • the system 1 is configured to provide fluid communication from the first filter outlet 55 towards the first system outlet 51.
  • the system 1 is configured to provide fluid communication from the heat treatment outlet 10 towards the at least one system outlet 71.
  • the filter unit 25 is backflushable for provision of the filter-reject.
  • the system 1 comprises: a backpressure valve 45e, a first drive 31, and a first pump 29a.
  • the backpressure valve 45e is provided between the first filter outlet 55 and the first system outlet 51.
  • the backpressure valve 45e is provided downstream of the filter unit 25.
  • the backpressure valve 45e is configured to control passage of the filtrate from the filter unit 25 and is configured to control passage of fluid comprising the filtrate from the first filter 25 outlet towards the first system outlet 51.
  • the first drive 31 is configured to drive the first pump 29a.
  • the first drive 31 is a variable frequency drive, VFD.
  • the first pump 29a is provided upstream of the filter unit 25 and between the system inlet 27 and the filter inlet 59.
  • the first pump 29a is configured to provide the first flow of water.
  • the system 1 is configured to backflush the filter unit 25 by controlling, e.g., by increasing, a differential pressure over the filter element, e.g., from the first filter outlet 55 towards the second filter outlet 57 and/or by controlling the first pump 29a and/or by controlling the backpressure valve 45e.
  • the first subsystem 3 comprises a first treatment unit 23 provided downstream of the filter unit 25 and between the first filter outlet 55 and the first system outlet 51.
  • the first treatment unit 23 is configured to treat the filtrate of the first flow, i.e., the filtrate provided by the filter unit 25.
  • the first treatment unit 23 comprises for instance a UV-unit.
  • the system 1 comprises a first buffer tank 21 provided upstream of the filter unit 25 and between the system inlet 27 and the filter inlet 59.
  • the system 1 comprises a dechlorination unit 75 configured to neutralize or decrease residual chlorine in the water, i.e., in the water received via the system inlet 27.
  • the system 1 is configured to provide a neutralization agent to the first buffer tank 21.
  • the system 1 comprises a technical water supply 33.
  • the system 1 is configured to provide technical water from the technical water supply 33 to the filter unit 25, e.g., for cleaning of the filter unit 25.
  • the system 1 is configured to provide technical water from the technical water supply 33 to the dechlorination unit 75, e.g., for dissolving a/the neutralization agent contained by the dechlorination unit 75.
  • the second subsystem 5 comprises a second buffer tank 37 provided between the second filter outlet 57 and the heat treatment unit 2.
  • the second buffer tank 37 is provided upstream of the heat treatment unit 2 and downstream of the filter unit 25.
  • the second buffer tank 37 is configured to receive the filter-reject.
  • the system 1 is configured for providing the second flow of water from the second buffer tank 37 towards the heat treatment unit 2.
  • the second subsystem 5 comprises a second pump 29b configured to provide the second flow of water.
  • the fluid communication from the heat treatment outlet 10 towards the at least one system outlet 71 comprises fluid communication from the heat treatment outlet 10 towards the first system outlet 51.
  • the system 1 comprises a bypass line 61 bypassing the first subsystem 3 and configured to provide/enable fluid communication from the system inlet 27 via the first buffer tank 21 to the second buffer tank 37.
  • the system 1 comprises a system-reject line 67 and a system-reject outlet 69.
  • the system-reject line 67 is configured to provide fluid communication from the second filter outlet 57 to the system-reject outlet 69. Utilizing the system-reject line 67 and the system-reject outlet 69, the system 1 is configured to discharge the filter-reject without entering the second subsystem 5.
  • the system 1 comprises various valves 45, sensors 43, sample facilities 41, and a water hammer 49. These features are disclosed above and below, e.g., with reference to the below list of references.
  • the system 1 comprises an interconnecting system of conduits as is evident from Fig. 1.
  • the first embodiment of Fig. 1 may comprise further, non-illustrated features.
  • Fig. 2 schematically illustrates a heat treatment unit 2, such as may be utilized according to the invention, e.g., forming part of the first embodiment of Fig. 1 and/or the second embodiment of Fig. 2.
  • the heat treatment unit 2 is explained above and with reference to the below list of references.
  • Fig. 3 schematically illustrates a second embodiment of a system 101 according to the invention.
  • the arrows provided interconnection the various features indicate intended direction of flow between the features.
  • the system 101 comprises an interconnecting system of conduits as is evident from Fig. 3.
  • the system 101 comprises: a system inlet 27 configured to receive water for treatment, a first subsystem 103, a second subsystem 105, and at least one system outlet 71 comprising a first system outlet 51.
  • the first subsystem 103 is configured to treat a first flow of water comprising at least part of the water received via the system inlet 27.
  • the first subsystem 103 comprises a filter unit 25 comprising a filter element.
  • the filter unit 25 is configured to provide a filtrate and a filter-reject of the first flow of water.
  • the second subsystem 105 is configured to treat a second flow of water comprising the filter-reject.
  • the second subsystem 105 comprises a heat treatment unit 2 comprising: a heat exchange section 6 (cf. Fig. 2) and a heat application section 8 (cf. Fig. 2).
  • the heat exchange section 6 is configured to exchange heat between a first heat exchange zone of the second flow of water and a second heat exchange zone of the second flow of water.
  • the heat application section 8 is configured to apply heat to the second flow of water at a heat application zone provided between the first heat exchange zone and the second heat exchange zone.
  • the filter unit 25 is backflushable for provision of the filter-reject.
  • the system 101 is configured to backflush the filter unit 25 by controlling, e.g., by increasing, a differential pressure over the filter element.
  • the first subsystem 103 comprises a first treatment unit 23 provided downstream of the filter unit 25.
  • the first treatment unit 23 is configured to treat the filtrate of the first flow, i.e., the filtrate provided by the filter unit 25.
  • the first treatment unit 23 comprises for instance a UV-unit.
  • the system 101 comprises a first buffer tank 21 provided upstream of the filter unit 25.
  • the second subsystem 105 comprises a second buffer tank 37 provided between the filter unit 25 and the heat treatment unit 2.
  • the second buffer tank 37 is provided upstream of the heat treatment unit 2 and downstream of the filter unit 25.
  • the second buffer tank 37 is configured to receive the filter- reject.
  • the system 101 is configured for providing the second flow of water from the second buffer tank 37 towards the heat treatment unit 2.
  • the system 101 comprises a bypass line bypassing the first subsystem 103 and configured to provide/enable fluid communication from the system inlet 27 via the first buffer tank 21 to the second buffer tank 37.
  • the system 101 comprises a system-reject line and a system-reject outlet 69.
  • the system-reject line is configured to provide fluid communication from the filter unit 25 to the system-reject outlet 69. Utilizing the system-reject line and the system-reject outlet 69, the system 101 is configured to discharge the filter-reject without entering the second subsystem 105.
  • the system 101 may comprise various valves and/or sensors and/or sample facilities and/or a water hammer. Such features are disclosed above and below.
  • the second embodiment of Fig. 3 may comprise further, non-illustrated features.
  • 29 may refer to one, more, or all of: 29a, 29b, 29c, etc...
  • VFD variable frequency drive
  • 41 may refer to one, more, or all of: 41a, 41b, 41c, and 41d
  • 43 may refer to one, more, or all of: 43a, 43b, 43c, etc...
  • 45 may refer to one, more, or all of: 45a, 45b, 45c, etc...

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

Abstract

L'invention concerne des systèmes et des procédés de traitement des eaux. Le système comprend un premier sous-système et un second sous-système, le premier sous-système comportant une unité de filtration constituée d'un élément filtrant et configurée pour fournir un filtrat et un rejet de filtration d'un premier flux d'eau, le second sous-système comportant une unité de traitement thermique comprenant une section d'échange de chaleur et une section d'application de chaleur, la section d'échange de chaleur étant configurée pour échanger de la chaleur entre une première zone d'échange de chaleur d'un second flux d'eau contenant le rejet de filtration et une seconde zone d'échange de chaleur du second flux d'eau, la section d'application de chaleur étant configurée pour appliquer de la chaleur au second flux dans une zone d'application de chaleur située entre la première zone d'échange de chaleur et la seconde zone d'échange de chaleur.
PCT/EP2023/051010 2022-01-18 2023-01-17 Système et procédé de traitement des eaux de ballast WO2023139062A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263300332P 2022-01-18 2022-01-18
US63/300,332 2022-01-18

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WO2023139062A1 true WO2023139062A1 (fr) 2023-07-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150108071A1 (en) * 2012-06-01 2015-04-23 Desmi Ocean Guard A/S De-ballast filtration
WO2018219429A1 (fr) 2017-05-29 2018-12-06 Bawat A/S Système et procédé de traitement thermique de l'eau d'un navire
WO2019134961A1 (fr) * 2018-01-05 2019-07-11 Bawat A/S Procédé et système de gestion d'eau de lest d'un navire pendant un voyage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150108071A1 (en) * 2012-06-01 2015-04-23 Desmi Ocean Guard A/S De-ballast filtration
WO2018219429A1 (fr) 2017-05-29 2018-12-06 Bawat A/S Système et procédé de traitement thermique de l'eau d'un navire
WO2019134961A1 (fr) * 2018-01-05 2019-07-11 Bawat A/S Procédé et système de gestion d'eau de lest d'un navire pendant un voyage

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