EP3914560A1 - Water treatment system and method of using the same - Google Patents
Water treatment system and method of using the sameInfo
- Publication number
- EP3914560A1 EP3914560A1 EP20702933.1A EP20702933A EP3914560A1 EP 3914560 A1 EP3914560 A1 EP 3914560A1 EP 20702933 A EP20702933 A EP 20702933A EP 3914560 A1 EP3914560 A1 EP 3914560A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- zone
- foam
- reactor
- treatment system
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims description 47
- 239000006260 foam Substances 0.000 claims abstract description 84
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 27
- 239000000645 desinfectant Substances 0.000 claims description 17
- 239000007800 oxidant agent Substances 0.000 claims description 13
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
- 238000011045 prefiltration Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 235000019688 fish Nutrition 0.000 description 16
- 241000251468 Actinopterygii Species 0.000 description 15
- 238000000926 separation method Methods 0.000 description 15
- 239000007787 solid Substances 0.000 description 11
- 238000001914 filtration Methods 0.000 description 9
- 235000013305 food Nutrition 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 239000008280 blood Substances 0.000 description 5
- 210000004369 blood Anatomy 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 235000019198 oils Nutrition 0.000 description 5
- 239000000975 dye Substances 0.000 description 4
- 244000052769 pathogen Species 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 241000607525 Aeromonas salmonicida Species 0.000 description 3
- 241000546112 Infectious salmon anemia virus Species 0.000 description 3
- 241001661732 Isavirus Species 0.000 description 3
- 238000003306 harvesting Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 235000021323 fish oil Nutrition 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 239000010822 slaughterhouse waste Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 241000972773 Aulopiformes Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000124008 Mammalia Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241000277263 Salmo Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003139 biocide Substances 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005351 foam fractionation Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910003480 inorganic solid Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 235000019515 salmon Nutrition 0.000 description 1
- 241001507086 salmonid fish Species 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/028—Control and monitoring of flotation processes; computer models therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1431—Dissolved air flotation machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1443—Feed or discharge mechanisms for flotation tanks
- B03D1/145—Feed mechanisms for reagents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/001—Agricultural products, food, biogas, algae
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/008—Water purification, e.g. for process water recycling
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/008—Mobile apparatus and plants, e.g. mounted on a vehicle
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- 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 present invention relates to a system for treatment of water, particularly for process water onboard of a vessel like a boat or a ship, comprising a reactor having a first zone and having a second zone, a water inlet for receiving an intake water flow at said first zone, a water outlet for discharging an output water flow from said second zone, bubble generator means that, during operation, generate and mix gas bubbles, particularly micro bubbles, with said intake water flow, and comprising foam removal means for separating and evacuating, during operation, a foam layer floating at a waterline of said second zone
- the invention moreover relates to a method of treating waste process water.
- the process of salmonid fish growing in net pens ends with the harvest of the fish using purpose-built well boats where the fish are harvested, slaughtered, bled and stored in chilled water until the vessel reaches a processing plant ashore.
- the chilled water is kept at 0,5°C by using a water chiller operating in a recirculating circuit. This ensures that the freshness of the product is kept during its transit to the processing plant.
- the process water for chilling and the salmon storage tanks are contaminated with fish blood and thus, treatment and disinfection are required.
- the mixture of process water with the fish blood is known as bloodwater.
- This bloodwater will contain blood, micro-organisms which can be pathogens, fish entrails, scales and inorganic solids.
- bloodwater will have i.a certain solids, oils, fats, oil turbidity colour, whose levels may vary in practice.
- the amount of fish blood in the process water will be about 30%-35%, producing a relatively high proportion of fine solids, dyes and fluid contaminants, particularly fish oil together with an amount of large solids, like parts of fish carcasses.
- slaughterhouse waste water or other processing waste in animal production can be performed with mechanical, biological and physical chemical methods.
- the choice of a particular treatment system will be determined inter alia by the strength of the waste stream: high-strength effluents, such as those resulting from terrestrial mammal slaughterhouses, will require a full suite of biological and physical-chemical treatment processes.
- Fish slaughterhouse waste streams are, generally, relatively diluted and tend to require specific techniques to treat the different solid fractions that exist in the waste stream, being either settable, suspended, fine or dissolved, aside from biologically inactivating the water. Processing of bloodwater, present in well boats, appears particularly challenging as it will contain a wide variety of different fractions, such as oils, parts of fish carcasses, dyes, small solids and potentially, pathogens.
- a system of the kind described in the opening paragraph uses an alternative filtration mechanism, know as floatation filtering.
- floatation filtering Such system is based on the use of air bubbles to attract pollutants.
- Floatation methods may require a larger footprints than other chemical-free filtration methods but have the ability of filtering both solids as well as oils and dyes from a waste stream.
- the two main floatation techniques are protein skimming (foam fractionation) and dissolved air floatation (DAF), depending on the size of the air bubbles being used.
- a floatation filtering system generally is divided over two consecutive zones.
- intake water and air bubbles are put in contact with each other.
- a bubble generator mixes said intake water with air bubbles.
- the process water is then fed to a second zone, referred to as separation zone.
- separation zone In this second zone, the air bubbles are allowed to coagulate with contaminants, which may be enhanced by the addition of flocculent agents and/or coagulants, resulting in a floating foam layer that builds up at the waterline, while cleaned water flows downwards.
- a foam removal mechanism is used to remove the foam layer from the waterline, for instance by skimming the surface thereby forcing the foam layer to a foam outlet near said surface.
- the present invention therefor, inter alia, has for its object to provide a water treatment system based of floatation filtering that, particularly, may also be used onboard of a vessel like a boat or a ship.
- a water treatment system of the type described in the opening paragraph is characterized in that said foam removal means comprise a foam collection device having an entrance beyond a level of said foam layer and having a foam outlet, in that said reactor is provided with water level control means that are configured to maintain said waterline within said reactor and said foam layer below a level of said entrance of said foam collection device, and in that said water level control means enable raising said waterline substantially to beyond a level of said entrance of said foam collection device, thereby discharging said foam layer at least substantially from said waterline.
- the waterline and the entrance of the foam collection device are kept in an intentionally spaced relationship during initial operation by maintaining the waterline well below the level of said entrance to allow for a motion of the system without the risk that process water will escape through said foam collection device.
- Said waterline may be raised by controlling the water level within the reactor once the foam layer needs to be removed. This will cause said foam layer to reach the entrance of the foam collection device such that it will be drained to the outlet of said foam collection device.
- the system can be operated with a low water level, keeping the entrance of the foam collection device away from the foam/water surface until the vessel has reached calmer waters. Then, a foam backwash or a continuous foam washing mode of operation may be initiated within the system by increasing its water level. This change in water level can for instance be accomplished using a motorised valve that restricts the outlet flow without changing the inlet flow.
- said water level control means comprise a pump connected to the water inlet and a shut-off valve at the water outlet of the reactor.
- a preferred embodiment of the system according to the invention is characterized in that said first zone surrounds said second zone, and in that said entrance of said foam collection device is located centrally at said second zone.
- the contact zone is, hence, placed in an outer rim of the plant and the separation zone in the centre. This way, even in motion, the plant's contact zone and separation zone will always be hydraulically connected.
- the foam collection device is also installed at the centre of the plant. This will be the place where the water surface effectively pivots. In other words, the centre of the reactor is where changes in water level elevation will be the smallest.
- a dual drain outlet may be provided at the bottom centre of the reactor to ensure both foam and water to exit the plant through the bottom centre, without mixing.
- a further preferred embodiment of the system according to the invention is characterized in that a screen is provided between said first zone and said second zone, said screen extending from a bottom of said reactor to below said waterline and separating said first zone and said second zone below said waterline from one another.
- Said screen between the first zone and the second zone shields the separation zone from any turbulence that may be created in the first zone by the intake of water and the introduction of gas bubbles. Because the screen ends below the waterline, process water may nevertheless still flow over the screen to reach the separation zone.
- a specific embodiment of the system according to the invention Is characterized in that said inlet comprises a perforated duct that extends at least substantially all along said first zone. This way the intake of process water will be guided substantially all along the first zone.
- said system is thereby characterized in that said bubble generator means are connected upstream of an inlet of said duct. This will ensure that also the introduction of gas bubbles will be distributed substantially homogeneously over the first zone.
- a further preferred embodiment of the system according to the invention is characterized in that spray nozzle means are provided at said entrance of said foam collection device that, during operation, direct a water spray to said entrance. ln order to ensure an adequate inactivation of possible pathogens with the process water, specifically infectious salmon anaemia virus (ISA virus) aeromonas salmonicida,
- ISA virus infectious salmon anaemia virus
- a further specific embodiment of the system according to the invention is characterized in that said reactor is provided with dosing means for holding and dosing a disinfectant and/or oxidant agent to said water, particularly for dosing an agent from a group of peracetic acid, ozone gas and hydrogen peroxide.
- dosing means for holding and dosing a disinfectant and/or oxidant agent to said water, particularly for dosing an agent from a group of peracetic acid, ozone gas and hydrogen peroxide.
- a disinfectant and/or oxidant agent to said water, particularly for dosing an agent from a group of peracetic acid, ozone gas and hydrogen peroxide.
- a further specific embodiment of the system according to the invention is characterized in that said water outlet is connected to a disinfectant station comprising at least one of a source of ozone and a source of ultra violet radiation.
- This disinfectant station may be applied alternatively or additionally, as an option, to the introduction of a disinfectant agent already in the reactor. Action of this system may be prompted based on the output of sensor means that monitor a biological activity within the output water of the reactor. Both UV radiation and ozone are non-toxic in the end to human to ensure food safety.
- the system according to the invention is characterized in that a pre-filter is connected upstream of the inlet to the reactor, particularly a drum filter or a bead filter.
- This pre-filter may be relatively coarse as its main purpose is to separate the larger solid fraction from the process water, like for instance remainders of fish carcasses.
- said process water is fed to the water treatment system according to one or more embodiments of the invention as described hereinbefore, wherein cleaned water is collected at the water outlet of said water treatment system, and wherein said collected water is re-circulated to said process plant.
- the method according to the invention is thereby characterized in that a oxidant is added form a group containing peracetic acid, ozone gas and hydrogen peroxide, particularly a stabilized hydrogen peroxide solution.
- a oxidant is added form a group containing peracetic acid, ozone gas and hydrogen peroxide, particularly a stabilized hydrogen peroxide solution.
- the addition of such oxidative agent may be prompted based on the output of sensors that monitor any microbial activity or redox potential within the reactor and/or at the output of the reactor.
- the use of a the listed oxidants is allowed to inactivate microbial activity in a food processing environment from a perspective of food safety and happens to be specifically effective against infectious salmon anaemia virus (ISA virus) aeromonas salmonicida, subsp.salmonicida, that may contaminate bloodwater from a fish industry plant.
- ISA virus infectious salmon anaemia virus
- a further embodiment of the method according to the invention is characterized in that a flocculent and/or coagulant agent is introduced in the reactor in order to enhance flocculation of contaminants contained therein.
- FIGS. 1A-C show schematically the basic operation of a water treatment system according to the invention
- figure 2 provides a perspective view of a first example of a water treatment system according to the invention
- figure 3 gives a schematic presentation of a practical setup of a water treatment system according to the invention
- Figure 4-6 show respectively a perspective view, cross section and top view of a second embodiment of a water treatment system in accordance with the invention, having a rectangular footprint;
- Figure 7-9 show respectively a perspective view, cross section and top view of a second embodiment of a water treatment system in accordance with the invention having a round footprint.
- the basic operation of a water treatment system is depicted schematically in figures 1A-1C.
- the system comprises a reactor 10 having a first zone 11 and a second zone 12. These zones will also be referred to as contact zone 11 and separation zone 12 respectively. Both zones are divided by a screen 13 that extends from a bottom 14 of the reactor to below a water line 15.
- the reactor may have a polygonal, e.g rectangular, square or octagonal, or circular footprint, the separation zone 12 being entirely surrounded by the contact zone 11.
- the contact zone 11 is provided with an inlet 21 for the intake of process water.
- the system moreover comprises bubble generation means, not shown in the figure, to generate and mix air micro bubbles with the intake water flow.
- the bubble generator means are located upstream of the inlet 21, such that a water/bubble mixture will enter the contact zone 11.
- the reactor is filled to beyond a level of the screens 13 such that said process water will also fill the separation zone 12, as shown in figure 1A.
- Said separation zone 12 is provided with a drain 22 at the bottom 14 that allows cleaned water to be discharged.
- the reactor 10 further comprises a foam collection device 30 having a entrance 31 centrally within the separation zone and well above the waterline 15 with the foam layer 16.
- the foam collection device has a foam outlet 32 outside the reactor 10 where foam that was evacuated from the surface may be collected and discharged.
- the reactor may be closed by a lid 17, preferably one having an inspection door.
- the system may cope with a relatively severe movement of the waterline 15 are may be experienced onboard of sea going vessels, like boats and ships.
- the waterline 15 may pivot within the reactor 10 due to waves that are encountered by the vessel, as shown in figure IB, but as long as the foam inlet 31 remains above the waterline 15 this will have hardly any impact on the performance of the system.
- the system can be operated with a low water level, figure IB, keeping the entrance 31 of the foam collection device 30 away from the foam/water surface until the vessel has reached calmer waters. Then, a foam backwash or a continuous foam washing mode of operation may be initiated within the system by increasing its water level as shown in figure 1C. This change in water level can for instance be accomplished using a motorised valve that restricts the flow from the outlet 22 without changing the intake at the inlet 21. At the higher water level the foam layer 16 will be raised to beyond the entrance 31 of the foam collection device and foam starts to enter the foam collection device 30 to be guided to the foam outlet 32.
- a spray nozzle 33 that is directed to the foam inlet 31 may be operated to create a water spray that promotes the flow of foam down the foam collection device 30 and avoids clogging of the entrance 31. At the same time cleaned water may be collected at the drain 22 to be re-circulated to a process plant.
- the reactor 10 has a square or rectangular footprint and is preferably made out of stainless steel or food grade plastic. Basically the reactor 10 is a large tank of several metres in all directions, e.g. 2x2x2 metre, with a central section that forms the separation zone 12 and a surrounding rim where the contact zone 11 is located. Both parts of the reactor are separated by a screen 15 of stainless steel.
- the reactor allows for radial flow, so water can always flow in and out of the reactor despite external (e.g. vessel) motion.
- the contact zone 11 is placed in an outer rim of the reactor and the separation zone 12 in the centre. This way, even in motion, the reactor's contact zone 11 and separation zone 12 will always be connected hydraulically.
- the reactor is further fitted with a foam collection device 30 that has an entrance 31 within a foam cup 35 that is installed at the centre of the reactor. This will be the place where the water surface effectively pivots. In other words, the centre of the reactor is where changes in water level elevation will be the smallest.
- a dual drain outlet 32 at the bottom centre of a false bottom 19 of the reactor ensures both foam and water exit the reactor through the bottom centre, without mixing.
- the reactor is further fitted with an auxiliary draining port 25.
- a spray nozzle 33 is connected to a water duct to allow spraying of fresh water onto and into the foam cup 35.
- the reactor is closed by a lid 17 having an inspection door 18 that may be opened for visual inspection of the reactor content.
- mechanical filter 40 that is mounted to an inlet 21 of the contact zone.
- this mechanical filter consists of a drum filter with an inlet 41 and an outlet 42.
- a bead filter may be used.
- This mechanical pre-treatment step is used to remove larger solid fractions from the waste water that is led to the reactor.
- Downstream of the filter 40 and upstream of the inlet 21 to the contact zone 11 is a bubble generator 50 that generates micro air bubbles and introduces these in the intake water flow before reaching the inlet of the contact zone 11.
- the inlet 21 of the contact zone opens into an inlet manifold 24.
- This manifold comprises a perforated pipe of for instance stainless steel and extends substantially all along the contact zone to distribute the water/bubble mixture substantially homogeneously over said contact zone 11.
- the treatment system according to the invention is particularly suitable for use onboard of purpose-built well boats that are used for harvesting fish, particularly Atlantic salmon growing in net pens. Using these boats, the fish are harvested, slaughtered, bled and stored in chilled water until the vessel reaches a processing plant ashore.
- Figure 3 gives a diagram of a possible setup of such a processing plant onboard of a ship. In this figure straight lines denote ducts and pipes (e.g. of PE or stainless steel) to connect parts of the plant, whereas dashed lines denote electrical control lines between sensors and actors. The entire assembly is monitored and controlled by a central processing unit. Further the following reference number have the following meaning:
- the disinfectant container holds a quantity of a food grade oxidant that may be added to the reactor in order to suppress pathogens.
- a stabilized hydrogen peroxide solution is used as disinfectant agent, commercially available under the trademark Oxyl-Pro ® .
- Hydrogen peroxide reacts quickly with organic matter, degrading in the process. Aeration also increases the degradation rate.
- Single-point dosing of hydrogen peroxide (in this case, dosed at the reactor) will result in a gradual decrease of hydrogen peroxide concentration across the fish holding tanks and the water refrigeration system. Therefore, monitoring the degradation of hydrogen peroxide through the different compartments and pipes of the plant will provide an indication of which concentrations are to be kept at the reactor.
- the main control parameter will be RedOx (Reduction-oxidation reaction) potential, which is used as an indication of the concentration of hydrogen peroxide.
- Redox and hydrogen peroxide strips can be used during trials to find a correlation between hydrogen peroxide concentration and redox values across the system.
- Oxidants such as hydrogen peroxide, peracetic acid and ozone are effective to inactivate particularly infectious salmon anaemia virus (ISA virus) aeromonas salmonicida,
- the system further comprises a variety of valves, pumps and sensors to monitor and control the waste water flow.
- water quality parameters to control in the system include:
- Dissolved oxygen/Nitrogen/TGP this is used to know the amount of gas bubbles that are being injected in the system
- Redox potential (ORP) for oxidation control. This is the main parameter controlling disinfectant/oxidant dosing.
- Bacterial counts (optional): an additional device working in a similar way to turbidity control: the more organic matter in the water there is, the more bacteria will be present in the process water.
- Equipment control includes:
- Automated disinfectant/oxidant dosing Alarms may include:
- the reactor may have a rectangular foot print as shown in figures 4-6. In this case the internal corners are chamfered by baffles 27. Putting baffles on these corners of the separation zone 12 of the tank will help reduce solids accumulation in the corners and improve hydraulics.
- the inlet 21 is provided with a back-wash bypass 29 as shown in the drawing.
- the reactor may have a round footprint as shown along the embodiment of figures 7-9.
- a UV irradiation treatment step may be inserted downstream of the reactor to enhance the oxidation process and to provide the plant with a water disinfection method which is food approved.
- a food-grade flocculent tank may be added, including dosing means, to add a flocculation agent for enhanced flock/foam formation.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biotechnology (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2022454A NL2022454B1 (en) | 2019-01-25 | 2019-01-25 | Water treatment system and method of using the same |
PCT/NL2020/050037 WO2020153846A1 (en) | 2019-01-25 | 2020-01-24 | Water treatment system and method of using the same |
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EP3914560A1 true EP3914560A1 (en) | 2021-12-01 |
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EP20702933.1A Pending EP3914560A1 (en) | 2019-01-25 | 2020-01-24 | Water treatment system and method of using the same |
Country Status (3)
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EP (1) | EP3914560A1 (en) |
NL (1) | NL2022454B1 (en) |
WO (1) | WO2020153846A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2023059906A1 (en) * | 2021-10-08 | 2023-04-13 | Aqua-Terra Consultants | Wastewater treatment system and methods utilizing chemical pre-treatment and foam fractionation |
CN115007050A (en) * | 2022-05-31 | 2022-09-06 | 佛山市美的清湖净水设备有限公司 | Water purifier and water outlet control method and device thereof and storage medium |
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US6156209A (en) * | 1999-02-11 | 2000-12-05 | Kim; Jason | Protein skimmer |
US7077967B2 (en) * | 2000-02-18 | 2006-07-18 | Zentox Corporation | Poultry processing water recovery and re-use process |
WO2003070645A1 (en) * | 2002-02-20 | 2003-08-28 | Clrpro, Inc. | Apparatus and method for the treatment of a contaminated fluid |
US20040217058A1 (en) * | 2002-12-19 | 2004-11-04 | Jason Cadera | Integrated dissolved air flotation and immersed membrane filtration apparatus and method for using same |
EP3201137B1 (en) * | 2014-10-02 | 2022-05-11 | Veolia Water Solutions & Technologies Support | Water treatment process employing dissolved air flotation to remove suspended solids |
EP3434375A3 (en) * | 2017-04-18 | 2019-05-01 | Pentair Aquatic Eco-Systems, Inc. | System and method for foam fractionation |
US11485650B2 (en) * | 2017-07-14 | 2022-11-01 | Besser Tech Holdings Llc | System for recovering fat, oil and grease from wastewater |
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2019
- 2019-01-25 NL NL2022454A patent/NL2022454B1/en active
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2020
- 2020-01-24 EP EP20702933.1A patent/EP3914560A1/en active Pending
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WO2020153846A1 (en) | 2020-07-30 |
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