JP2013527798A - Method and system for ballast water and filtering - Google Patents

Abstract

A method and system for purifying an in-line water filter for use in a marine vessel is provided.

Description

  The present invention relates generally to ballast water treatment, and more specifically to the treatment of in-line filters to eliminate marine species and pathogenic bacteria.

  Ballast water is used to balance the weight distribution of marine vessels. Ballast water is often loaded at one port, transported to another port, and emptied at the new port. This general practice is inherently dangerous. Draining ballast water loaded into a ship from a certain port is harmful to the port and the surrounding environment, and can be dangerous to humans and animals. The ballast water may be salt water that is pumped from a salt water source such as the ocean or sea at the port where the marine vessel is anchored. As described herein, salt water serves the function of ballast water. However, fresh water also functions as ballast water.

  Before the ballast water is pumped into the storage tank in order to properly balance the ship during voyage, a filter is installed in the ship to filter the ballast water and remove waste and large organisms. May be. Depending on the location of the ship's filter, the filter may block the remaining amount of ballast water because it may hinder drainage. This residual ballast water can leak back into the environment the next time the ballast water is loaded into the ship at a new port, causing harm to the environment at that new port and posing a danger to humans and animals. ing. This includes, for example, International Maritime Organization (IMO) standards, US Coast Guard (USCG) guidelines, as described in Regulation D-2 of the International Convention for the Regulation and Management of Ship Ballast Water and Sediment, and the United States May violate various state ballast water treatment performance standards.

  Introducing alien marine life into a new ecosystem may have a devastating effect on native flora and fauna that may not have natural defenses on the new species. In addition, harmful bacterial pathogens such as Vibrio cholerae may be present at the departure port. These pathogens can grow in ballast tanks and filters over time and cause disease epidemics in the areas where they are released.

  One or more embodiments of the present invention provide a system and method for treating water in a marine vessel. More specifically, one or more embodiments provide for the treatment of ballast water and in-line water filters used onboard marine vessels to purify ballast water, filters and residual amounts of water remaining in the filters. Directed to. The system and method of the present invention kills marine organisms that can inhabit / propagate within the waste liquid of filters and filter discharge piping / valves and drainage flush streams.

  One aspect of the present invention is an on-site water treatment shipboard system that includes an in-line filter housed in a housing for filtering inflowing seawater, and a ballast capable of purifying a flush stream drained from the filter. A water and filtering system and a flash line. The flush stream contains a residual amount of seawater that remains on the filter after filtration.

  A ballast water and filtering system electrolyzes filtered seawater to produce a depleted seawater solution containing one or more oxidants and hydrogen, and an electrolytic cell in fluid communication with the filter, and the filtered seawater and electrolytic cell. One or more ballast tanks in communication with the filter and the electrolyzer that receive at least one of the electrolytes from the filter, a filter flushing means, and a residual oxidant in the flush stream of less than 0.2 mg / L And a neutralization system for reconciliation.

  The flash line has an inlet and an outlet. The inlet of the flash line abuts the filter outlet. The neutralized flush stream is drained from the outlet of the flush line. The ballast water and filtering system can further purify the flush line.

  The filter flushing means is a side flow of the electrolytic solution from the electrolytic cell. Alternatively, the filter flushing means may be a side stream of filtered and treated seawater from one or more ballast tanks.

  The on-site water treatment shipboard system may further include means for measuring the concentration of one or more oxidants in the flash stream and means for adjusting the flow rate of the electrolytic solution from the electrolytic cell according to the measured concentration. The means for measuring the concentration of the one or more oxidants may comprise one or more redox potential (ORP) analyzers that can determine the ORP value of the flash stream.

  The neutralization system may further comprise a reducing agent source in communication with the flush stream and a control means for the amount of reducing agent supplied to the flush stream. The reducing agent source may be one or more reducing agents selected from the group consisting of sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide and thiosulfate. Further, the neutralization system may have a tank for storing the reducing agent and a neutralizing agent line communicating with the flush line.

A cyclone may be used to separate hydrogen from the electrolyte, dilute the separated hydrogen with ambient air, and vent to the atmosphere.
Another aspect of the present invention is an in-situ ballast water treatment method in a marine vessel. The method includes providing a self-cleaning filter for filtering incoming seawater and installing ballast water and a filtering system in the vessel to purify a flush stream drained from the filter. The flush stream may contain a residual amount of water that remains on the filter after filtration.

  The ballast water and filtering system electrolyzes filtered seawater to produce a depleted seawater solution containing one or more oxidants and hydrogen, and an electrolytic cell in fluid communication with the filter, and from the filtered seawater and electrolytic cell. One or more ballast tanks may be provided that receive the electrolyte solution or any of them and communicate with the filter and the electrolytic cell.

  The method may further comprise providing a filter flushing means. The filter flushing means may include a secondary flow of electrolyte from the electrolytic cell. Alternatively, the filter flushing means may include a side stream of filtered and treated seawater from one or more ballast tanks.

  Residual oxidant in the flash stream may be neutralized to less than 0.2 mg / L, and the neutralized flash stream may be drained from the flash line. The ballast water and filtering system may further be capable of purifying the flush line. Residual oxidant neutralization may include providing a neutralization system having a source of reducing agent in fluid communication with the flush stream. The neutralization system may further comprise a means for controlling the amount of reducing agent supplied to the flush stream, a tank for storing the reducing agent, and a neutralizing agent line communicating with the flush line. The reducing agent source may be one or more reducing agents selected from the group consisting of sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide and thiosulfate.

  The method may further include the step of measuring the concentration of one or more oxidants in the flash stream and the step of adjusting the flow rate of the electrolyte from the electrolytic cell according to the measured concentration. Measuring the concentration of one or more oxidants may include providing one or more redox potential (ORP) analyzers. The ORP analyzer may further determine the ORP value of the flash stream.

Hydrogen may be separated from the electrolyte. The separated hydrogen may be diluted with ambient air and exhausted to the atmosphere.
Various objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of embodiments of the invention, along with the accompanying drawings in which like numerals represent like components.

FIG. 1 shows a schematic diagram illustrating a system for on-site treatment of ballast water and in-line filters according to one embodiment of the present invention. FIG. 2 is a schematic diagram showing the on-site treatment method for ballast water and an inline filter according to an embodiment of the present invention.

  FIG. 1 illustrates one embodiment of a system 100 used in a marine vessel (not shown), eg, a ship, for on-site treatment of ballast water and in-line filters. The in-line filter 108 is used for filtering ballast water. The filter pump 104 draws ballast water into the filter 108 from one or more sea chests or inlets. The pump 104 is disposed upstream of the filter 108. Ballast water may include seawater or fresh water with a natural salt content.

  The water may be passed through a coarse mesh strainer (not shown) and pre-filtered. The filter 108 may comprise at least one self-cleaning filter. In another embodiment, the filter 108 comprises a strainer and a filter. Water flows into the filter 108 and passes through the water intake 112. Filter 108 is disposed in a housing (not shown). The housing may be made from carbon steel, rubber-lined carbon steel, an alloy or any other material suitable for housing a filter. The water in the filter 108 passes through a filter screen with a filtration rating in the range of about 20 micrometers to about 5 millimeters. The filter screen separates particulate matter (organic matter and inorganic matter) in the water and generates filtered water that can be drained. The filtered water exits from the filter 108 to the filtered water outlet 116.

  Almost all water entering the filter 108 is filtered out or drained, but a small amount or residual amount of water inevitably remains or is collected in the filter 108. This residual amount of water can be contaminated with marine organisms and bacteria that are potentially harmful to the environment. Therefore, the residual water in the filter 108 should be purified to kill or kill these collected organisms and bacteria, and do not allow these foreign marine species and pathogenic bacteria to be transferred to the water of ports other than the departure port. is important.

  The ballast water and filtering system 100 further includes a filtering system 102 having means for processing substantially all of the residual amount of water that remains in the filter 108. As used herein, the term “residual amount of water” may include contaminants contained in the residual amount of water in the filter 108 or any contaminants that are trapped in the filter 108. .

  The ballast water and filtering system 100 includes one or more ballast tanks 120 into which a portion of the filtered water drained via the filtered water main stream 118 flows. The filtrate mainstream is also referred to herein as “ballast waterstream”. Ballast water and filter treatment system 100 further includes one or more electrolyzers 124 disposed downstream of filter 108. The filtered filtrate substream 128a is separated from the filtrate main stream 118 and separated toward one or more electrolyzers 124. In an alternative embodiment, the side stream 128 c is pumped from the one or more ballast tanks 120 after the filtrate main stream 118 enters the one or more ballast tanks 120.

  The side stream 128a passes through the side stream piping and flows to one or more electrolyzers 124, where either salt that is naturally present in the ballast water in the case of seawater or added chloride salt in the case of fresh water. Generates hypochlorite. For the purposes of this description, seawater is used, but embodiments of the present invention are not limited to seawater. Any salt water that generates chlorine may be used.

The electrolytic cell 124 includes electrodes that are fed under an anode and cathode direct current. Under this condition, partial electrolysis of sodium chloride (NaCl) contained in the raw seawater occurs. A sodium chloride (NaCl) aqueous solution is completely dissociated into sodium ions (Na ⁺ ) and chlorine ions (Cl ⁻ ), which react on the anode side to generate free chlorine. Hydroxide ions (OH ⁻ ) in water migrate from the cathode region and react with Na ⁺ and Cl ₂ near the anode to produce sodium hypochlorite (NaOCl) and hydrogen (H ₂ ).

  Sodium hypochlorite in water is hydrolyzed to hypochlorous acid (HOCl). A part of HOCl reacts with bromine in water to form hypobromite (HOBr). HOCl and HOBr act as killing agents used to treat ballast water.

The water can further flow into the cyclonic hydrogen separator 125 where the hypochlorite-generated hydrogen (H ₂ ) byproduct is separated from the side stream 128b and exhausted to the atmosphere via the hydrogen exhaust line 126. Sidestream 128b further reenters ballast water mainstream 118 to kill marine organisms and bacteria in one or more ballast tanks 120.

  Ballast water and filtering system 100 includes a total organic carbon (TOC) analyzer 129 in fluid communication with ballast water 118. The total organic carbon analyzer 129 is a device that measures the carbon concentration in water from an organic source such as microorganisms, plant substances, algae, organic acids, and inorganic compounds derived from organic substances. As a general rule, it is well known in the art that about 1 ppm of chlorine is required to neutralize about 1 ppm of TOC.

  The ballast water and filtering system 100 further comprises hypochlorite generation control means in communication with the total organic carbon analyzer 129. The hypochlorite generation control means may comprise any suitable equipment, but in one embodiment is electrically connected to the control system 130 in communication with the total organic carbon analyzer 129 and the electrolytic cell 124. Power supply 131. The control system 130 can adjust the amperage applied to the electrolytic cell 124 in response to the TOC measurement.

  Ballast water and filtering system 100 further includes a flow meter 133 in fluid communication with ballast water 118. The flow meter 133 communicates with the hypochlorite generation control means. A flow meter 133 can be placed in the ballast water stream 118 to measure the flow rate of the ballast water. The hypochlorite generation control means can determine the amount of hypochlorite that needs to be generated in order to kill the organisms in the ballast water 118 using the flow rate of the ballast water and the TOC measurement value. Therefore, the amperage that must be added to the electrolytic cell 124 to generate hypochlorite can be determined.

  The ballast water and filtering system 100 further includes one or more redox potential (ORP) probes 134. In general, the ORP probe 134 measures the voltage across the circuit formed by the reference electrode and the measurement electrode, and there is ballast water between the electrodes. The ORP value of ballast water 118 is proportional to the concentration of HOCl and HOBr oxidizer in ballast water 118. Both HOCl and HOBr are in the form of halogen group chlorine and bromine oxidants. The ORP probe 134 is in fluid communication with the ballast water 118. The ORP probe 134 communicates the ORP value to the hypochlorite generation control means. When the ORP probe 134 is placed downstream of the point 127 where hypochlorite is added to the ballast water 118, the hypochlorite generation control means uses the measurements to remove all microorganisms in the ballast water. In order to ensure that there is enough hypochlorite to kill, make sure that there is excess halogen in the ballast water 118 as an oxidant. In various embodiments, the ORP probe 134 is upstream of the ballast tank 134, within the ballast tank 120, downstream of the ballast tank 122, downstream of the ballast water drain pump (not shown), flushing means 132 (ORP probe 197), flush. Located at one or more locations selected from the group consisting of line 184 (ORP probe 198) and neutralizer line 156 (ORP probe 199).

  The ballast water and filter processing system 100 further includes system data recording means 135. The system data recording means 135 can comprise any data recording device known in the art. Examples of such data recording devices include computerized devices such as hard drives, flash memory, CD-ROMs and magnetic disks, ie, programmable logic controllers (PLCs), and non-computerized records such as paper plots. Device included. The system data to be measured and recorded includes the flow rate of ballast water, the amperage applied to the electrolyzer 124, the voltage of the electrolyzer 124, the combined redox potential (ORP) value of the ballast water 118 and the side stream 128, and Any parameter desirable to those skilled in the art can be included, including but not limited to the ORP value of ballast water before draining. System data can be measured and recorded at regular time intervals.

  The ballast water and filter processing system 100 further includes ballast water treatment effect verification means 137. The ballast water treatment effect verification means 137 can be included in the system data recording means or the hypochlorite generation control means. Ballast water treatment effect verification means 137 can be used to plot system data, download a removable hard drive or flash drive, download system data on a laptop computer or mobile terminal, transfer system data to the Internet, or an outboard location Optional, well-known in the industry to demonstrate to a supervisory authority such as the Coast Guard or the Port Authority that the ballast water treatment has been carried out properly, including but not limited to wireless transmission of system data to The means can be provided. The supervisor may use this information to confirm that the ballast water has been properly treated.

  The ballast water and filter processing system 100 further includes filter flushing means 132. Filter flushing means 132 may cause filter 108 to flow a decontaminating agent such as hypochlorite to purify the flush stream drained from the filter, the flush stream remaining in filter 108 after filtration. Contains residual amount of seawater. The filter 108 further comprises inlet flushing means 136 connected to the first end 140 of the flushing means 132. In one embodiment, the second end of the flushing means 132 is connected to a hypochlorite source comprising a container for containing hypochlorite. For example, the flushing means 132 may include a secondary flow of the electrolytic solution from the electrolytic cell 124. In another embodiment, the flushing means 132 may include a side stream of filtered and treated seawater from the ballast tank 120.

  Halogens in the form of halogen-containing oxidants such as HOCl and HOBr are produced by hypochlorite generation to kill organisms in the ballast water. However, halogen-containing oxidants are potentially dangerous to marine flora and fauna around the ship.

  In one embodiment of the system of the present invention, the ballast water and filtering system 100 may include a neutralization system 148 disposed downstream of one or more ballast tanks 120. The neutralization step of ballast water includes a step of neutralizing an oxidizing agent to form a neutral salt of halogen. The neutralization system 148 includes ballast water oxidant content measuring means 138, a reducing agent source 139 that is in fluid communication with the ballast water via the reducing agent pipe 152, and control means for the amount of reducing agent supplied to the ballast water. 141. The reducing agent amount control means 141 communicates with the halogen or reducing agent content measuring means 138.

  The halogen or reducing agent content measuring means 138 can comprise one or more redox potential (ORP) probes. The reducing agent amount control means 141 may comprise any combination of devices known in the industry including, but not limited to, a control system, a computer, a programmable logic controller and a pump.

  The reducing agent source 139 can include a reducing agent tank and a pump in fluid communication with the reducing agent tank. The pump communicates with the reducing agent amount control means 141. The reducing agent source 139 can further include any combination of suitable reducing agents. Examples of suitable reducing agents include sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide and thiosulfate.

  The neutralization system 148 further includes an effect verification unit 142 for neutralizing 148 of ballast water. Ballast water neutralization 148 effectiveness verification means 142 can plot system data, download a removable hard or flash drive, download system data on a laptop computer or mobile device, transfer system data to the Internet, or Any means known in the industry for demonstrating that the ballast water has been properly neutralized may be provided, including but not limited to wireless transmission of system data to an outboard location. Optionally, neutralization effect verification means may be included in the reducing agent amount control means 141. Supervisors can use this data to confirm that the ballast water has been properly neutralized.

  The ballast water and filter processing system 100 further includes means for draining the ballast water from the ballast tank 120. The discharge pipe 122 defines a discharge port 196 that leads to the outside of the ship that drains the ballast water.

  The ballast water and filtering system 100 further includes a neutralizer line 156. Neutralizer line 156 injects neutralizer into hypochlorite treated (or otherwise purified) water, residual chlorine and / or other oxidants present in the remaining amount of water. It may be neutralized. Residual chlorine may be neutralized to less than 0.2 mg / L. Neutralizer line 156 is connected to a reducing agent source at a first end 168. The container containing the reducing agent is connected to the neutralizer line 156 at the first end 168 using it as a source of neutralizer. For example, in one embodiment, the reducing agent source 139 of the neutralization system 148 is fed through the neutralizing agent line 156 to the water that hypochlorites the reducing agent.

  The second end 172 of the neutralizer line 156 is connected to the filter 108. The filter 108 further includes a neutralizer inlet 176 that attaches the second end 172 of the neutralizer line 156. The reducing agent source is in fluid communication with a residual amount of water.

  Filter 108 further includes a flush outlet 180 and flush line 184 for backflushing / draining residual amounts of water. The first end 188 of the flash line 184 is attached to the flash outlet 180. The neutralized flush stream may drain from the filter 108 and the purified water exits the flush outlet 180 and exits the filter 108 via the flush line 184. In an alternative embodiment, the second end 172 of the neutralizer line 156 may be coupled to the flash line 184, between the reducing agent source and the flash stream to neutralize residual oxidants present in the flash stream. Establish fluid communication. The neutralized water exits the flash line 184 at the second end 192 of the flash line 184 and is discharged from the vessel (196).

  Referring now to FIG. 2, in one or more embodiments of the method of the present invention, ballast water is pumped (204) and passed through a filter (208). As mentioned earlier, the filter can generate filtered water by separating particulate matter from seawater or fresh water. The filter drains filtered water while retaining a residual amount of water in the filter. The method further includes purifying residual amounts of water remaining in the filter by subjecting the filter to one or more treatment processes.

  The method may further include transferring a portion of the filtered water to a treated stream (212) and injecting the treated stream into one or more electrolyzers. When current is applied to one or more electrolytic cells, the one or more electrolytic cells generate hypochlorite in the process stream (216). Hydrogen may be separated from the process stream by venting means.

  The method may further include a step 220 of treating a residual amount of water remaining in the filter to kill or inactivate marine organisms and / or bacteria collected in the filter. Good. Fluid communication may be established between the filter and the electrolytic cell. Hypochlorite produced in one or more electrolyzers may be used in the treatment 220 of residual water remaining in the filter by injecting one or more oxidants into the residual water. .

  Hypochlorite 216 generated in one or more electrolytic cells may be used for the treatment of ballast water. In one aspect, some of the filtered water drained from the filter is a ballast water stream. The ballast water stream is injected as pipes into one or more ballast tanks as ballast water, and the treated stream is injected again into the ballast water and then sampled to determine the redox potential (ORP) value of the ballast water stream. The ORP value of the ballast water stream is measured with one or more ORP probes. In response to the measured ORP value, the electrolyzer current is increased or decreased to increase or decrease the hypochlorite produced in the process stream to obtain the proper concentration of hypochlorite in the ballast water tank. adjust.

  The step of treating the ballast water may further include a step of confirming the total organic carbon content (TOC) of the ballast water. The oxidant requirement can be confirmed by any suitable method, including measurement with a TOC analyzer, obtaining a value from a reference source, and measuring the TOC content with a ballast water sampling and analysis device. When measuring the total organic carbon content of ballast water, the measurement or sampling can be done at any suitable location, including incoming ballast water, water outside the ship, and water in the ballast tank.

  The treatment stream is piped into the electrolytic cell to generate hypochlorite. The treated stream is a side stream of filtered water that is injected as pipes into one or more ballast tanks as ballast water. Ampere is added to one or more electrolyzers to generate hypochlorite in the process stream. A treatment stream containing hypochlorite is injected into the ballast water to treat the ballast water. In one embodiment, hypochlorite is injected into ballast water upstream of the ballast water tank to facilitate mixing of hypochlorite and ballast water. Hypochlorite production by the electrolyzer is regulated in response to the oxidant demand of the ballast water. The higher the TOC content of ballast water, the greater the amount of hypochlorite that must be generated.

  The step of adjusting the production of hypochlorite by the electrolytic cell in response to the total organic carbon content may further include the step of adjusting the amperage applied to the electrolytic cell. Increasing the amperage will increase hypochlorite production. In order to maintain residual halogen in the ballast water, the formation of hypochlorite is adjusted. Residual halogen is a halogen-containing oxidizing agent that exceeds the amount necessary to kill all microorganisms present in the ballast water. The presence of residual halogen in the ballast water prevents microorganisms that can grow in the ballast water tank from surviving in the ballast water. The generation of hypochlorite by the electrolytic cell is adjusted so that the weight ratio of hypochlorite in the ballast water to the required amount of oxidant in the ballast water is in the range of about 1.0 to about 3.0. Residual halogen will be maintained in the ballast water at a weight ratio greater than 1.0.

Measure the flow rate of ballast water. The flow rate is combined with the TOC content of ballast water to determine the rate of hypochlorite generation required for ballast water treatment.
Measure and record process data. Process data consists of the flow rate of ballast water, the number of amperes applied to the electrolyzer, the voltage of the electrolyzer, the redox potential of the ballast water and side stream combined, and the redox potential of the ballast water before draining from the ship One or more parameters selected from:

  In one embodiment, hypochlorite (216) generated in the electrolytic cell is used to treat (220) the remaining amount of water remaining in the filter. In another embodiment, hypochlorite treated ballast water is used to treat (220) the remaining amount of water remaining in the filter. For example, hypochlorite within one or more ballast tanks is used to treat (220) the remaining amount of water remaining in the filter.

Residual halogens in the ballast water produced in the electrolytic cell in response to the TOC content can be removed by neutralizing the ballast water before draining from the vessel.
Reducing agent is fed to the neutralization system (224). Prior to draining the ballast water from the ship (232), a reducing agent is used to neutralize (228) the oxidant of the hypochlorite-treated ballast water.

  The step of neutralizing the ballast water may include a step of measuring the oxidant content of the ballast water by the oxidant content measuring means. In response to the measured oxidant content, a reducing agent is added to the ballast water to neutralize the ballast water before draining from the vessel. In one embodiment, the reducing agent may be added downstream of the ballast tank. Examples of suitable reducing agents include sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide, thiosulfate and combinations thereof.

  The step of neutralizing the ballast water may further include a step of measuring a redox potential (ORP) value of the ballast water. In response to the measured ORP value, one or more reducing agents are added to the ballast water to neutralize the ballast water. The amount of reducing agent added to the ballast water can be adjusted to maintain a measurement of the ORP value that indicates the presence of excess reducing agent in the ballast water. In the presence of excess reducing agent, there should be no potentially harmful halogens such as chlorine and bromine. The redox potential may be maintained below about 200 mV. An ORP value of less than 200 mV indicates that there is an excess of reducing agent. In another embodiment, the redox potential is maintained at about 0 mV.

  In one embodiment, a reducing agent may be injected inside the filter to neutralize one or more oxidants or residual chlorine in residual amounts of water. The step of neutralizing residual chlorine includes adding one or more reducing agents selected from the group consisting of sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide, thiosulfate, and combinations thereof to one or more oxidizing agents. A process may be included.

  The flush line carries a flush stream containing the purified residual amount of water from the filter to the drainage area (232). In another embodiment, a reducing agent is injected into the hypochlorite treated water at a point in the flush line before draining.

  The above-described means for measuring, controlling and recording system data and process data, such as an all-carbon analyzer, a hypochlorite generation control means, a flow meter, an oxidation-reduction potential (ORP) probe, and a system data recording means are used as filters. It is also used to measure, control and record system and process parameters related to cleaning and neutralization of remaining residue.

  Other embodiments of the present invention can kill marine organisms that inhabit / propagate filters and filter discharge piping / valves, blowdown / drainage, fresh water washing, chlorination, ozonation, peroxide treatment, phosphate Through treatment, treatment with any other suitable chemical, nitrogen purging, carbon dioxide purging, oxygen stripping / vacuum induced oxygen depletion, hot water immersion (salt water and / or fresh water), steaming and combinations thereof A system and method for draining flush stream wastewater is included.

  While various embodiments of the present invention have been described above, other and further embodiments of the present invention can be envisaged without departing from the basic scope thereof. The scope of the invention is determined by the following claims. The present invention is not limited to the embodiments, versions or examples described above, which are described so that those skilled in the art can make and use the invention when combined with information and knowledge available to those skilled in the art. ing.

Claims (17)

An on-site water treatment shipboard system,
An in-line filter housed in a housing for filtering inflowing seawater;
A ballast water and filtering system capable of purifying a flush stream drained from the filter, wherein the flush stream contains a residual amount of seawater remaining in the filter after filtration; and With
The ballast water and filtering system,
Electrolyzing the filtered seawater to produce a depleted seawater solution containing one or more oxidants and hydrogen, wherein the electrolytic cell is in fluid communication with the filter;
One or more ballast water tanks communicating with the filter and the electrolytic cell, and receiving at least one of the filtered seawater and electrolyte from the electrolytic cell;
Filter flushing means for rinsing the filter;
The ballast water and filtration system comprising a neutralization system for neutralizing residual oxidants in the flush stream to less than 0.2 mg / L;
A flush line having an inlet and an outlet, wherein the inlet of the flash line abuts a filter outlet, the neutralized flush stream is drained from the outlet of the flash line, and the ballast water and filtering system is Furthermore, the said flash line is a system provided with the said flash line which can purify | clean.   The system of claim 1, wherein the filter flushing means comprises a secondary flow of the electrolyte from the electrolytic cell.   The system of claim 1, wherein the filter flushing means comprises a side stream of at least one of the filtered seawater and electrolyte from the one or more ballast water tanks. Means for measuring the concentration of the one or more oxidants in the flash stream;
The system according to claim 2, further comprising means for adjusting a flow rate of the electrolytic solution from the electrolytic cell according to the measured concentration.   The means for measuring the concentration of the one or more oxidants comprises one or more redox potential analyzers, wherein the one or more redox potential analyzers further determine the redox potential of the flash stream. 4. The system according to 4. The neutralization system is
A reducing agent source in communication with the flush stream;
The system according to claim 1, further comprising a control means for controlling the amount of reducing agent supplied to the flush stream.   The system of claim 6, wherein the reducing agent source comprises one or more reducing agents selected from the group consisting of sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide, and thiosulfate. The neutralization system is
A tank for storing the reducing agent;
The system of claim 6, further comprising a neutralizer line in communication with the flush line.   The system of claim 1, further comprising a cyclone for separating hydrogen from the electrolyte, wherein the separated hydrogen is diluted with ambient air and exhausted to the atmosphere. An on-site ballast water treatment method in a marine vessel,
Providing a self-cleaning filter for filtering incoming seawater;
Installing ballast water and a filtering system in the vessel to purify a flush stream containing residual amount of seawater drained from the filter and remaining in the filter after the filtration;
The ballast water and filtering system is
An electrolytic cell in fluid communication with the filter to electrolyze the filtered seawater to produce a depleted seawater solution comprising one or more oxidants and hydrogen;
One or more ballast water tanks communicating with the filter and the electrolytic cell, and receiving at least one of the filtered seawater and electrolyte from the electrolytic cell;
Providing a filter flushing means for flushing the filter;
Neutralizing residual oxidant in the flash stream to less than 0.2 mg / L;
Draining the neutralized flush stream from the flush line;
The method wherein the ballast water and filtering system can further purify the flush line.   The method of claim 10, wherein the filter flushing means comprises a side stream of the electrolyte from the electrolytic cell.   The method of claim 10, wherein the filter flushing means comprises a side stream of at least one of the filtered seawater and electrolyte from the one or more ballast water tanks. Measuring the concentration of the one or more oxidants in the flash stream;
The method of Claim 11 further equipped with the process of adjusting the flow volume of the said electrolyte solution from the said electrolytic vessel according to measured concentration.   Measuring the concentration of the one or more oxidants includes providing one or more redox potential analyzers, wherein the one or more redox potential analyzers further determine the redox potential of the flash stream; The method of claim 13. The step of neutralizing the residual oxidant further includes a step of providing a neutralization system, the neutralization system comprising:
A reducing agent source in communication with the flush stream;
Control means for controlling the amount of reducing agent supplied to the flush stream;
A tank for storing the reducing agent;
The method of claim 10, further comprising a neutralizer line in communication with the flash line.   16. The method of claim 15, wherein the source of reducing agent comprises one or more reducing agents selected from the group consisting of sodium sulfite, sodium metabisulfite, sodium bisulfite, sulfur dioxide and thiosulfate.   The method of claim 10, further comprising separating the hydrogen from the electrolyte, wherein the separated hydrogen is diluted with ambient air and exhausted to the atmosphere.

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