Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63J—AUXILIARIES ON VESSELS
  • B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
  • B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/72—Treatment of water, waste water, or sewage by oxidation
  • C02F1/722—Oxidation by peroxides
• • 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
  • C02F1/72—Treatment of water, waste water, or sewage by oxidation
  • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
  • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
• • 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
  • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
  • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
  • C02F2103/023—Water in cooling circuits
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2201/00—Apparatus for treatment of water, waste water or sewage
  • C02F2201/78—Details relating to ozone treatment devices
  • C02F2201/782—Ozone generators

Definitions

• the present invention relates to a method for the purification of the ballast water of ships by means of ozonation treatment, in which the ballast water is treated in the system of ballast water piping between an outlet to the sea and a ballast water tank.
• the present invention also relates to an apparatus for the purification of the ballast water of ships by means of ozonation treatment, of the type in which a ballast water system comprises at least one outlet to the sea and at least one ballast water tank connected by pipes along which it is disposed at least one ballast pump and means for ozonation of the ballast water.
• ballast water is therefore of increasing importance and, recently have been proposed apparatuses for the ozone treatment of large ships' ballast water.
• ozone is used as a disinfectant since the end of the nineteenth century.
• Ozone is a naturally occurring allotrope of oxygen and has the highest oxidation potential among all commercially available oxidants.
• the ozone is an oxidizing agent and a biocide and is unstable in water.
• a method and apparatus for water ozonation treatment for ships is proposed with the international application published under n.WO2010013903 in the name of NK CO LTD.
• a polyvalent method and related for ozonation treatment for a ship which are able to perform different treatments such as purification of water used in ship, the purification of waste water generated during the journey, the purification of harmful gases generated during operation of the engine of the ship or generated from the internal space of the vessel, the treatment and sterilization of water ballast, all using the sterilizing potential of ozone gas generated by an ozone generator present on board.
• the concentration of the ozone gas generated by the ozone generator can be controlled so that it can be provided at different concentrations for the various uses mentioned above.
• ballast water treatment quality is carried out by blowing ozone gas directly into the ballast water piping.
• the proposed method and apparatus allow to optimize the use of the ozone generator which is exploited for various purposes, however, it has big limitations in the ballast water treatment quality.
• ozone in seawater is more complex than in fresh water as it leads to the formation of secondary disinfectant products.
• the biggest difference is due to the presence of bromide ions in sea water.
• the ballast water ozonation causes the formation of bromate ions and bromoform.
• ozone can also react with the so-called NOM (natural organic matter), whose presence in the ballast water reduces the formation of bromates as it reduces the amount of oxidant free to react with the bromide ion.
• NOM natural organic matter
• Another object of the present invention is to propose a method and related apparatus that combines a high efficacy of treatment of ballast water with low plant costs.
• a method for the purification of the ballast water of ships by means of ozonation treatment provides that the ballast water is treated in the system of ballast water piping between an outlet to the sea and a ballast water tanks, in particular via direct blowing ozone into the ballast water piping.
• the treatment of ballast water includes steps of:
• the above outlined method provides that the ozone gas is previously injected in sea water, which constitutes the auxiliary process water which can be drawn from the outside or from other internal use, that this is added with hydrogen peroxide, whose presence improves the reactions of ozonation, and that, after having given to the mixture the reaction time required, the auxiliary ozonated water is mixed with the ballast water so that, thanks to the better liquid-liquid solubility, the ozonation treatment of the ballast water takes place in an optimized manner.
• an apparatus for the purification of ballast water of ships by means of ozonation treatment provides the presence of a ballast water system in which there is at least an outlet to the sea and at least one ballast water tank connected by pipes along which is disposed at least one ballast pump and means for ballast water ozonation which are usually constituted by nozzles able to blow in the ballast water piping the ozone produced by an ozone generator.
• the apparatus provides an ozonation system suitable for supplying the above-mentioned means for ballast water ozonation, the ozonation system comprising:
• a piping system suitable to carry process water consisting of sea water to the means for ballast water ozonation
• hydrogen peroxide adduction means for entering hydrogen peroxide taken from the hydrogen peroxide tank in the piping system, for adding hydrogen peroxide to the process water.
• An apparatus as outlined above allows the ozonation of process water and adding it with hydrogen peroxide, which then is properly mixed to the ballast water in the ballast water system, to effectively treat the ballast water.
• FIG. 1 shows a block diagram of an apparatus according to the present invention
• Figure 3 shows a schematic perspective view of an ozonation plant included in the apparatus of Fig.1 ;
• Figure 4 shows a perspective view of a portion of a ballast water system in an apparatus according to Fig.l;
• Figure 5 shows in detail a part of Fig.4
• Figure 6 shows a perspective view similar to that of Fig. 4 of a ballast water plant for ships of conventional type.
• the apparatus 100 arranged on several levels, LI, L2, L3 inside of a ship, includes means for production of compressed air, 110, means for production of oxygen, 120, an ozone generator, 130, cooling means, 140, for the ozone generator, a system for ozonation of process water, 150, and a ballast water system, 160.
• a first portion of the apparatus consists in the production of compressed air, and from this in the production of oxygen which is used by the ozone generator 130.
• These portions of the apparatus comprise an air compressor, 111, a filter (not shown) for the filtration of air between the compressor 111 and a compressed air tank, 112, filters (not shown) between the compressed air tank 112 and an oxygen generator, 121, in two stages, a process oxygen tank, 122, and an oxygen tank, 123, for the containment of pure oxygen at 96%.
• the oxygen of the oxygen tank 123 feeds the ozone generator 130 which is of conventional type in which ozone is produced by chemical reaction of oxygen atoms with oxygen molecules.
• the production of ozone requires the presence of a gas container where there are two electrodes separated by a dielectric material.
• the power supply with a high frequency voltage to the electrodes causes an endothermic process in which 95% of the energy involved is released in the form of heat that must be dissipated.
• the dissipation of heat takes place thanks to the cooling means 140.
• the cooling means 140 are constituted by a water cooling system.
• a closed-loop water circulation system supplies cooling water to the ozone generator 130 through plate heat exchangers.
• the temperature and the flow rate of the cooling water at the outlet of the cooling means 140 are constantly monitored through a control panel 180, so that the ozone generator 130 is always effectively cooled.
• the ozone produced by the ozone generator 130 is fed to the system for ozonation of process water 150 represented in Figures 1 and 3.
• the process water circulating in the ozonation system 150 is preferably cooling water coming from the ship's engine room.
• the treatment water is passed through a series of filters, 151, with 200 micron mesh.
• the process water Once the process water has been filtered it is distributed to three parallel plumbing to feed three separate ballast water systems 160.
• the treatment water is pushed towards a contact reactor, 152, by a booster pump, 153.
• an ozone injector, 154 enter in the ozonation system 150 ozone produced by the ozone generator 130.
• the ozone injector 154 and the contact reactor 152 are interposed means for feeding hydrogen peroxide, 155, intended to enter in the ozonation system 150 hydrogen peroxide taken from a hydrogen peroxide tank, 156.
• Some of the above-mentioned components, shown in the schematic view of FIG. 1, are not illustrated in FIG. 3 for simplicity of representation.
• the ozonation system 150 includes additional conventional components, not shown, used in ways that are known by the experts of the field, such as isolation valves, pressure switches, flow meters, metering valves, drain valves and others.
• a ozone destruction system, 157 which is provided to eliminate the ozone gas not solubilized in the process water, is associated to the contact reactor 152. Ozone not solubilized is collected at the exit from any contact reactor 152 and introduced into the ozone destruction system 157.
• the water ballast system 160 comprises a sea chest, 161, from which the sea water is taken with which are fed the ballast tanks, 162 (not shown in FIG.4). Between the sea chest 161 and the ballast tank 162 is interposed a ballast pump, 163, intended to circulate the ballast water in the piping of the ballast system 160.
• a bypass duct, 164, is arranged at the ballast pump 163, and together with respective bypass valves, 165, is suitable to allow the passage of the ballast water without that the same pass through the ballast pump 163.
• ballast pump 163 Between the ballast pump 163 and the outlet 161 to the sea cest, in the vicinity of the latter it is disposed a sludge separator, 166, suitable to retain the coarsest impurities which precipitate in its interior. Between the sludge separator 166 and ballast pump 163 is provided also an underwater self-cleaning filter, 167, suitable to perform further filtering of ballast water. Between the ballast pump 163 and the ballast tanks 162 a branch of the ballast water system 160, provided with a suitable drain valve, 168, leads to a discharge to the sea chest, 169, suitable to allow the expulsion outside of the ballast water.
• ballast water ozonation means 170 are provided between the ballast pump 163 and the ballast tanks 162 between the ballast pump 163 and the ballast tanks 162.
• the above ballast water ozonation means 170 are constituted by a static mixer suitable for mixing the treatment water coming from the ozonation system 150 with the water of the ballast water system 160.
• the static mixer is advantageously constituted by a flash pipeline reactor, shown in greater detail in FIG. 5, suitable to furnish the ozonated process water coming from the ozonization system 160 in the ballast water stream.
• PFR flash pipeline reactor
• the PFR is installed in line with minimum dimensions compared to the contact reactors or other types of mixing members.
• ballast water ozonation means 170 which allow the mixing of the process water with the ballast water.
• ballast water ozonation means 170 which allow the mixing of the process water with the ballast water.
• bypass duct 164 and the underwater self-cleaning filter 167 are also provided.
• ballast water taken from the sea chest 161 is sent to the ballast tank 162 by means of the ballast pump 163.
• the ballast water is ozonated by mixing it with process water taken from an ozonation system 150.
• the ballast water is mixed with the process water by pumping the process water in the ballast water stream without interrupting or altering the flow of the latter, preferably by using a PFR, 170.
• the process water is sea water used preferably from the cooling water of the engine room which is previously ozonated through injection of gaseous ozone produced by an ozone generator 130 and then added with hydrogen peroxide taken from a hydrogen peroxide tank 156.
• process water to which gaseous ozone and hydrogen peroxide have been added passes into contact reactors 152 before being mixed to the ballast water.
• ozone not-solubilized process water is eliminated so that gaseous ozone can not reach the ballast water.

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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)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Toxicology (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Treatment Of Water By Oxidation Or Reduction (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=55754344

Family Applications (1)

Country Status (2)

Citations (1)

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• 2016
  • 2016-01-19 WO PCT/IT2016/000013 patent/WO2017125956A1/en not_active Ceased
  • 2016-01-19 EP EP16716704.8A patent/EP3405436A1/de not_active Withdrawn

Patent Citations (1)

Non-Patent Citations (2)

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