EP3626336A1 - Mixing system for the introduction of chemical substances in a fluid to be treated - Google Patents
Mixing system for the introduction of chemical substances in a fluid to be treated Download PDFInfo
- Publication number
- EP3626336A1 EP3626336A1 EP19198702.3A EP19198702A EP3626336A1 EP 3626336 A1 EP3626336 A1 EP 3626336A1 EP 19198702 A EP19198702 A EP 19198702A EP 3626336 A1 EP3626336 A1 EP 3626336A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- mixing system
- fluid
- internal wall
- mixing
- 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.)
- Granted
Links
- 238000002156 mixing Methods 0.000 title claims abstract description 75
- 239000012530 fluid Substances 0.000 title claims abstract description 44
- 239000000126 substance Substances 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 239000010802 sludge Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 11
- 229920000867 polyelectrolyte Polymers 0.000 description 9
- 238000011282 treatment Methods 0.000 description 9
- 125000002091 cationic group Chemical group 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000009291 froth flotation Methods 0.000 description 3
- 230000035755 proliferation Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/43—Mixing liquids with liquids; Emulsifying using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
- B01F27/861—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle the baffles being of cylindrical shape, e.g. a mixing chamber surrounding the stirrer, the baffle being displaced axially to form an interior mixing chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
Definitions
- the invention concerns a mixing system designed to introduce chemical substances in a fluid to be treated.
- Some steps of a process for the treatment of the waste water of a paper mill include the use of a polyelectrolyte, for example a cationic flocculant powder, or even, for example, a cationic polyacrylamide, suited to be applied in the clariflocculation of water containing organic substances, in sludge thickening treatments, in sludge dehydration processes and also in other processes carried out in paper mills, such as froth flotation.
- a polyelectrolyte for example a cationic flocculant powder, or even, for example, a cationic polyacrylamide, suited to be applied in the clariflocculation of water containing organic substances, in sludge thickening treatments, in sludge dehydration processes and also in other processes carried out in paper mills, such as froth flotation.
- these polymers need premixing with water at a preestablished concentration.
- premixing step is carried out in static mixing tanks, in which the polymer is introduced after being taken from a small storage container; said polymers are normally diluted in solutions between 0.2% and 1%, therefore they are very demanding in terms of water usage.
- a booster pump introduces the water with the polymer into a pipe leading to a tank or a channel for the treatment of waste sludge.
- the patent document US5314076 describes a system for mixing two fluid phases, more specifically for mixing a treatment fluid with a fluid to be treated; said system comprises two concentric chambers that communicate with each other at least with their ends, the central chamber being provided with two turbines whose rotation axis is equal to the axis of symmetry of the installation.
- the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
- the diffuser and the mixer define three internal chambers that are superimposed in vertical direction, an upper chamber, a central chamber and a lower chamber, as well as an external annular region. Each of the three internal chambers is in fluid communication with the annular region.
- the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
- a mixing system according to the invention is indicated by the numeral 10.
- Said mixing system 10 comprises:
- the second chamber 17 is to be understood as ring-shaped.
- the labyrinthine mixing path 30 is indicated by arrows that schematically show the possible paths of the fluid being treated between the inlet duct 19 and the outlet duct 20.
- the drive means comprise, for example and not exclusively, a motor 35 configured to set the rotation shaft 21 rotating.
- Said rotation shaft 21 carries the stirring blades 18.
- the rotation axis of the rotation shaft 21 is parallel to the direction of extension of the internal wall 13.
- the external wall 12 has a cylindrical shape.
- the internal wall 13 has a cylindrical shape.
- the second chamber 17 surrounds the first chamber 16.
- the second chamber 17 is concentric and coaxial with the first chamber 16.
- the inlet duct 19 is positioned below the outlet duct 20 with respect to a configuration of use of the mixing system 10.
- the stirring blades 18 comprise a first group of blades 18a positioned at the lower end of the rotation shaft 21.
- said first group of blades 18a is positioned below the inlet duct 19 with respect to a configuration of use of the mixing system 10.
- Said first group of blades 18a is to be understood as capable of being arranged also in another position along the rotation shaft 21.
- stirring blades 18 can be constituted by a single group of blades 18a.
- the stirring blades 18 comprise also a second group of blades 18b positioned in a central area of the rotation shaft 21.
- said second group of blades 18b is positioned above the inlet duct 19 with respect to a configuration of use of the mixing system 10.
- the first chamber 16 and the second chamber 17 are in communication with each other through at least one passage opening 37 defined at the level of one end of the internal wall 13.
- a first passage opening 37 is defined by a lower recirculation space between a lower end 13a of the internal wall 13 and the bottom 14.
- a second passage opening 38 is defined by an upper recirculation space between an upper end 13b of the internal wall 13 and the cover 15.
- first chamber 16 and the second chamber 17 are in communication only through a lower passage opening 37; in said variant the upper end 13b of the internal wall 13 is in contact with the cover 15 and there is no upper passage opening 38.
- first chamber 16 and the second chamber 17 are in communication only through an upper passage opening 38; in said variant the lower end 13a of the internal wall 13 is in contact with the bottom 14 and there is no lower passage opening 37.
- the inlet duct 19 and the outlet duct 20 are both advantageously positioned in proximity to the bottom 14 with respect to a configuration of use of the mixing system 10.
- the mixing system 10 comprises a flow deviation element 40 configured to deviate the fluid flowing out of the first chamber 16 towards the second chamber 17.
- Said flow deviation element 40 is placed on the bottom 14.
- Said flow deviation element 40 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction, where the term 'radial' is intended with respect to an axial direction of the axis of symmetry of the internal wall 13, wherein the flow is flowing downwards from the first chamber 16.
- the at least one injection passage 22 comprises a first injection pipe 22a directly connected to the inlet duct 19.
- said at least one injection passage 22 comprises, in addition or as an alternative, a second injection pipe 22b directly connected to the first chamber 16.
- said at least one injection passage 22 comprises, in addition or as an alternative to one or both of the first injection pipe 22a and second injection pipe 22b, a third injection pipe 22c directly connected to the second chamber 17.
- a second embodiment of a mixing system is schematically represented in Figure 2 and therein indicated by the numeral 110.
- the specific characteristic of the mixing system 110 lies in that the container 111, comprising an external wall 112, an internal wall 113, a bottom 114 and a cover 115, comprises also an intermediate wall 150.
- Said intermediate wall 150 defines, together with the external wall 112 and the internal wall 113, three concentric mixing chambers, a first central chamber 116 defined within the internal wall 113, a second intermediate chamber 117 that surrounds the first chamber 116 and a third external chamber 153 that surrounds the second chamber 117.
- a first passage opening 137 between the first chamber 116 and the second chamber 117 is defined by an upper recirculation space between an upper end 113a of the internal wall 113 and the cover 115.
- a second passage opening 138 between the first chamber 116 and the second chamber 117 is defined by a lower recirculation space between a lower end 113b of the internal wall 113 and the bottom 114.
- a first passage opening 154 between the second chamber 117 and the third chamber 153 is defined by a lower recirculation space between a lower end 150a of the intermediate wall 150 and the bottom 114.
- a second passage opening 155 between the second chamber 117 and the third chamber 153 is defined by an upper recirculation space between an upper end 150b of the intermediate wall 150 and the cover 115.
- first chamber 116 and the second chamber 117 are in communication only through an upper passage opening 137, and the second chamber 117 and the third chamber 153 are in communication only through a lower passage opening 154.
- first chamber 116 and the second chamber 117 are in communication only through a lower passage opening 138, and the second chamber 117 and the third chamber 153 are in communication only through an upper passage opening 155.
- the inlet duct 119 and the outlet duct 120 are both advantageously positioned in proximity to the bottom 114 with respect to a configuration of use of the mixing system 110.
- the mixing system 110 comprises a flow deviation element 140 configured to deviate the fluid flowing out of the first chamber 116 or the second chamber 117 towards the third chamber 153.
- Said flow deviation element 140 is placed on the bottom 114.
- Said flow deviation element 140 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction.
- the mixing system 110 comprises an injection passage 122 for the introduction of a chemical additive in one or more points of the labyrinthine mixing path 130.
- the mixing system 10 operates in such a way that the fluid to be treated, for example sludge, flows into the first chamber 16 through the inlet duct 19 and, thanks to gravity and to the action of the stirring blades 18, flows downwards, towards the passage opening 37, in which it is deviated upwards into the second chamber 17; while flowing upwards along the second chamber 17 the treated fluid meets the outlet duct 20 and is conveyed into it.
- the fluid to be treated for example sludge
- a chemical additive for example cationic polyacrylamide, is injected in the fluid to be treated during its passage through said labyrinthine mixing path 30.
- the mixing system 110 operates in such a way that the fluid to be treated flows into the first chamber 116 through the inlet duct 119 and is conveyed upwards thanks to the action of the stirring blades 118.
- the fluid follows a labyrinthine mixing path 130 in which it passes through all of the three chambers, the first 116, the second 117 and the third 153, and from the latter passes into the outlet duct 120.
- the invention provides a mixing system thanks to which the fluid to be treated and the chemical additive are mixed with no need for the chemical additive to be prepared, meaning diluted, in advance in costly and bulky water tanks, thus drastically reducing water consumption.
- the chemical additive for example a cationic flocculant polymer, is activated when it comes in direct contact with a fluid to be treated, and this happens directly inside the first, the second and, if necessary, the third chamber.
- the invention provides a mixing system which, thanks to the stirring effect produced by the stirring blades, improves the effectiveness and the efficiency of the chemical additive; for example, in the case of organic sludge, in which the sludge has an apolar surface membrane, the strong stirring action favours the breakage of said membrane and makes anionic sites available; the introduction of and the mixing with a cationic polyelectrolyte make the anionic sites react with the cationic polyelectrolyte releasing water molecules, which favours a greater separation of the solid fraction of the fluid being treated from the liquid fraction.
- the invention provides a mixing system that makes it possible to drastically reduce the use of water when preparing a polyelectrolyte intended to be introduced in a flow of waste fluid to be treated.
- the invention provides a mixing system that favours the reduction of energy consumption in waste water treatment processes, since it is no more necessary to manage a mixing and storage tank and the efficiency in terms of separation of the dry fraction from the liquid fraction is improved compared to the known treatment systems.
- the invention provides a mixing system that improves water retention from sludge, thus increasing the quantity of dry product obtainable.
- the invention provides a mixing system that is capable of reducing waiting times before the beginning of the action of the polymer in solution on the fluid to be treated, consequently improving the effectiveness of the polymer itself; this has been obtained by introducing the chemical additive directly in the fluid to be treated and subjecting both of them to a mixing action produced by the stirring blades.
- the invention provides a compact mixing system that can be easily set up also in existing waste water purification or treatment systems or sludge drying systems.
- the invention provides a mixing system that limits the proliferation of bacteria on the same polyelectrolytes, thanks to the direct introduction of the same polyelectrolytes directly in the fluid to be treated, without providing for a storage period before use.
- any components and any materials can be used, provided that they are compatible with the intended use, and any shape and size can be selected, according to the needs and the state of the art.
Abstract
Description
- The invention concerns a mixing system designed to introduce chemical substances in a fluid to be treated.
- Nowadays clean water is considered a valuable resource which must be preserved and used only in the cases where its consumption is absolutely necessary.
- For example, the paper industry has always used huge quantities of fresh water, meaning new water, in order to be able to obtain high quality products.
- However, in the last few years environmental regulations and a greater environmental awareness at a global level have been increasingly leading people to reduce water consumption.
- Today, for example, paper sludge is becoming increasingly important and is increasingly used for producing other paper, in the tile and cement industry, in environmental restoration projects, for covering dumps and in building mixes.
- Some steps of a process for the treatment of the waste water of a paper mill include the use of a polyelectrolyte, for example a cationic flocculant powder, or even, for example, a cationic polyacrylamide, suited to be applied in the clariflocculation of water containing organic substances, in sludge thickening treatments, in sludge dehydration processes and also in other processes carried out in paper mills, such as froth flotation.
- During these process steps it is necessary to maximize the yield of the polymer, that is, of the cationic flocculant, in order to improve the quality of the dry residue in the case of sludge or to improve froth flotation in the case of a froth flotation step.
- In order to be activated, these polymers need premixing with water at a preestablished concentration.
- Nowadays, said premixing step is carried out in static mixing tanks, in which the polymer is introduced after being taken from a small storage container; said polymers are normally diluted in solutions between 0.2% and 1%, therefore they are very demanding in terms of water usage.
- In the static mixing tank mixing is obtained from the simple turbulence of water. Successively, a booster pump introduces the water with the polymer into a pipe leading to a tank or a channel for the treatment of waste sludge.
- Thus, as already mentioned, these systems using a cationic flocculant, even if widely used and appreciated, require the use of considerable quantities of water and of specific mixing equipment, together with the corresponding ducts for preparation for use and for introduction in a sludge treatment line.
- Another limitation of the sludge treatment systems currently known lies in that the polyelectrolytes are culture media for bacteria, therefore a polymer that remains in a storage tank for long is very likely to foster the proliferation of bacteria.
- The patent document
US5314076 describes a system for mixing two fluid phases, more specifically for mixing a treatment fluid with a fluid to be treated; said system comprises two concentric chambers that communicate with each other at least with their ends, the central chamber being provided with two turbines whose rotation axis is equal to the axis of symmetry of the installation. - In this technical solution known in the art, the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
- The patent document
US2012/0199524 describes a clarifier silo comprising a closed container with an internal mixer surrounded by a diffuser with a cylindrical tube. - The diffuser and the mixer define three internal chambers that are superimposed in vertical direction, an upper chamber, a central chamber and a lower chamber, as well as an external annular region. Each of the three internal chambers is in fluid communication with the annular region.
- Even in this technical solution known in the art, the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
- Even in the mixer described in patent document
US3392963 , the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet. -
- The mixers and the equipment described in the above-mentioned patent documents are not able to overcome the drawbacks and the limitations illustrated above.
- It is the task of the present invention to provide a mixing system for the introduction of chemical substances in a fluid to be treated, which can overcome the above-mentioned drawbacks and limitations of the known art.
- More specifically, it is an object of the invention to provide a mixing system that makes it possible to drastically reduce the use of water for the preparation of a polyelectrolyte suited to be introduced in the flow of waste fluid to be treated.
- It is another object of the invention to provide a mixing system that favours the reduction of energy consumption in waste water treatment processes.
- It is a further object of the invention to provide a mixing system that improves water retention from sludge, thus increasing the quantity of dry product obtainable from sludge.
- It is another object of the invention to provide a mixing system that can reduce the waiting times for the beginning of the action of the polymer in solution on the fluid to be treated, consequently improving the effectiveness of the polymer itself.
- It is another object of the invention to provide a mixing system that is compact and can be easily set up also in already existing waste water purification or treatment plants or sludge drying plants.
- It is another object of the invention to provide a mixing system that limits the proliferation of bacteria on the same polyelectrolytes.
- The task and the objects illustrated above are fulfilled by a mixing system for the introduction of chemical substances in a fluid to be treated according to claim 1.
- Further characteristics of the mixing system according to claim 1 are described in the dependent claims.
- The task and the objects illustrated above, together with the advantages described below, are highlighted in the description of two embodiments of the invention, which are provided by way of non-limiting example with reference to the attached drawings, wherein:
-
Figure 1 shows a schematic side sectional view of a first embodiment of a mixing system according to the invention; -
Figure 2 shows a schematic side sectional view of a second embodiment of a mixing system according to the invention. - With reference to
Figure 1 , in the context of a first embodiment, a mixing system according to the invention is indicated by thenumeral 10. - Said mixing
system 10 comprises: - a
container 11 comprising anexternal wall 12, aninternal wall 13, abottom 14 and acover 15, - two concentric mixing chambers, a first
central chamber 16 defined within theinternal wall 13 and asecond chamber 17 defined outside theinternal wall 13, thefirst chamber 16 and thesecond chamber 17 being in communication with each other, - an
inlet duct 19 for a fluid to be treated, configured to introduce said fluid from the outside into saidfirst chamber 16, - an
outlet duct 20 for the treated fluid, saidoutlet duct 20 being configured to allow the outflow of said fluid from saidsecond chamber 17 to the outside of saidcontainer 11, - stirring
blades 18 positioned inside thefirst chamber 16, operated by drive means through arotation shaft 21, - at least one
injection passage 22 for the introduction of a chemical additive in one or more points of thelabyrinthine mixing path 30. - In the present example of embodiment, the
second chamber 17 is to be understood as ring-shaped. - The
labyrinthine mixing path 30 is indicated by arrows that schematically show the possible paths of the fluid being treated between theinlet duct 19 and theoutlet duct 20. - The drive means comprise, for example and not exclusively, a
motor 35 configured to set therotation shaft 21 rotating. - Said
rotation shaft 21 carries the stirringblades 18. - The rotation axis of the
rotation shaft 21 is parallel to the direction of extension of theinternal wall 13. - More specifically, in the present non-limiting example of embodiment of the invention, the
external wall 12 has a cylindrical shape. - In the present non-limiting example of embodiment of the invention, also the
internal wall 13 has a cylindrical shape. - More specifically, the
second chamber 17 surrounds thefirst chamber 16. - More specifically, the
second chamber 17 is concentric and coaxial with thefirst chamber 16. - In said example of embodiment, the
inlet duct 19 is positioned below theoutlet duct 20 with respect to a configuration of use of themixing system 10. - In said example of embodiment, the
stirring blades 18 comprise a first group ofblades 18a positioned at the lower end of therotation shaft 21. - More specifically, said first group of
blades 18a is positioned below theinlet duct 19 with respect to a configuration of use of themixing system 10. - Said first group of
blades 18a is to be understood as capable of being arranged also in another position along therotation shaft 21. - It is to be understood that the
stirring blades 18 can be constituted by a single group ofblades 18a. - In said example of embodiment, the
stirring blades 18 comprise also a second group ofblades 18b positioned in a central area of therotation shaft 21. - More specifically, said second group of
blades 18b is positioned above theinlet duct 19 with respect to a configuration of use of themixing system 10. - The
first chamber 16 and thesecond chamber 17 are in communication with each other through at least one passage opening 37 defined at the level of one end of theinternal wall 13. - More specifically, but not exclusively, in said example of embodiment a first passage opening 37 is defined by a lower recirculation space between a
lower end 13a of theinternal wall 13 and thebottom 14. - More specifically, but not exclusively, in said example of embodiment a second passage opening 38 is defined by an upper recirculation space between an
upper end 13b of theinternal wall 13 and thecover 15. - In a variant embodiment, not illustrated for the sake of simplicity, the
first chamber 16 and thesecond chamber 17 are in communication only through a lower passage opening 37; in said variant theupper end 13b of theinternal wall 13 is in contact with thecover 15 and there is no upper passage opening 38. - In a further variant embodiment, not illustrated for the sake of simplicity, either, the
first chamber 16 and thesecond chamber 17 are in communication only through an upper passage opening 38; in said variant thelower end 13a of theinternal wall 13 is in contact with thebottom 14 and there is no lower passage opening 37. - In said further variant embodiment, the
inlet duct 19 and theoutlet duct 20 are both advantageously positioned in proximity to thebottom 14 with respect to a configuration of use of themixing system 10. - The mixing
system 10 comprises aflow deviation element 40 configured to deviate the fluid flowing out of thefirst chamber 16 towards thesecond chamber 17. - Said
flow deviation element 40 is placed on the bottom 14. - Said
flow deviation element 40 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction, where the term 'radial' is intended with respect to an axial direction of the axis of symmetry of theinternal wall 13, wherein the flow is flowing downwards from thefirst chamber 16. - The at least one
injection passage 22 comprises afirst injection pipe 22a directly connected to theinlet duct 19. - In a variant embodiment, said at least one
injection passage 22 comprises, in addition or as an alternative, asecond injection pipe 22b directly connected to thefirst chamber 16. - In a further variant embodiment, said at least one
injection passage 22 comprises, in addition or as an alternative to one or both of thefirst injection pipe 22a andsecond injection pipe 22b, athird injection pipe 22c directly connected to thesecond chamber 17. - A second embodiment of a mixing system is schematically represented in
Figure 2 and therein indicated by the numeral 110. - The specific characteristic of the
mixing system 110 lies in that thecontainer 111, comprising anexternal wall 112, aninternal wall 113, a bottom 114 and acover 115, comprises also anintermediate wall 150. - Said
intermediate wall 150 defines, together with theexternal wall 112 and theinternal wall 113, three concentric mixing chambers, a firstcentral chamber 116 defined within theinternal wall 113, a secondintermediate chamber 117 that surrounds thefirst chamber 116 and a thirdexternal chamber 153 that surrounds thesecond chamber 117. - In said second embodiment of the
mixing system 110 according to the invention: - the
first chamber 116 and thesecond chamber 117 are in communication with each other through at least onepassage opening 137 defined at the level of one end of theinternal wall 113, and at the same time - the
second chamber 117 and thethird chamber 153 are in communication with each other through at least onepassage opening 154 defined at the level of one end of theintermediate wall 150. - More specifically, but not exclusively, in said example of embodiment a first passage opening 137 between the
first chamber 116 and thesecond chamber 117 is defined by an upper recirculation space between anupper end 113a of theinternal wall 113 and thecover 115. - More specifically, but not exclusively, in said example of embodiment a second passage opening 138 between the
first chamber 116 and thesecond chamber 117 is defined by a lower recirculation space between a lower end 113b of theinternal wall 113 and the bottom 114. - More specifically, but not exclusively, in said example of embodiment a first passage opening 154 between the
second chamber 117 and thethird chamber 153 is defined by a lower recirculation space between alower end 150a of theintermediate wall 150 and the bottom 114. - More specifically, but not exclusively, in said example of embodiment a second passage opening 155 between the
second chamber 117 and thethird chamber 153 is defined by an upper recirculation space between anupper end 150b of theintermediate wall 150 and thecover 115. - In a variant embodiment, not illustrated for the sake of simplicity, the
first chamber 116 and thesecond chamber 117 are in communication only through an upper passage opening 137, and thesecond chamber 117 and thethird chamber 153 are in communication only through alower passage opening 154. - In a further variant embodiment, not illustrated for the sake of simplicity, either, the
first chamber 116 and thesecond chamber 117 are in communication only through alower passage opening 138, and thesecond chamber 117 and thethird chamber 153 are in communication only through anupper passage opening 155. - In said further variant embodiment, the
inlet duct 119 and theoutlet duct 120 are both advantageously positioned in proximity to the bottom 114 with respect to a configuration of use of themixing system 110. - The
mixing system 110 comprises aflow deviation element 140 configured to deviate the fluid flowing out of thefirst chamber 116 or thesecond chamber 117 towards thethird chamber 153. - Said
flow deviation element 140 is placed on the bottom 114. - Said
flow deviation element 140 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction. - Analogously to what has been described above with reference to the first embodiment of the invention, the
mixing system 110 comprises aninjection passage 122 for the introduction of a chemical additive in one or more points of thelabyrinthine mixing path 130. - According to its first embodiment illustrated in
Figure 1 , the mixingsystem 10 operates in such a way that the fluid to be treated, for example sludge, flows into thefirst chamber 16 through theinlet duct 19 and, thanks to gravity and to the action of thestirring blades 18, flows downwards, towards thepassage opening 37, in which it is deviated upwards into thesecond chamber 17; while flowing upwards along thesecond chamber 17 the treated fluid meets theoutlet duct 20 and is conveyed into it. - A chemical additive, for example cationic polyacrylamide, is injected in the fluid to be treated during its passage through said
labyrinthine mixing path 30. - According to its second embodiment illustrated in
Figure 2 , themixing system 110 operates in such a way that the fluid to be treated flows into thefirst chamber 116 through theinlet duct 119 and is conveyed upwards thanks to the action of the stirring blades 118. - Successively, the fluid follows a
labyrinthine mixing path 130 in which it passes through all of the three chambers, the first 116, the second 117 and the third 153, and from the latter passes into theoutlet duct 120. - It has practically been shown that the mixing
system - In fact, the invention provides a mixing system thanks to which the fluid to be treated and the chemical additive are mixed with no need for the chemical additive to be prepared, meaning diluted, in advance in costly and bulky water tanks, thus drastically reducing water consumption.
- The chemical additive, for example a cationic flocculant polymer, is activated when it comes in direct contact with a fluid to be treated, and this happens directly inside the first, the second and, if necessary, the third chamber.
- Furthermore, the invention provides a mixing system which, thanks to the stirring effect produced by the stirring blades, improves the effectiveness and the efficiency of the chemical additive; for example, in the case of organic sludge, in which the sludge has an apolar surface membrane, the strong stirring action favours the breakage of said membrane and makes anionic sites available; the introduction of and the mixing with a cationic polyelectrolyte make the anionic sites react with the cationic polyelectrolyte releasing water molecules, which favours a greater separation of the solid fraction of the fluid being treated from the liquid fraction.
- Therefore, the invention provides a mixing system that makes it possible to drastically reduce the use of water when preparing a polyelectrolyte intended to be introduced in a flow of waste fluid to be treated.
- In addition to the above, the invention provides a mixing system that favours the reduction of energy consumption in waste water treatment processes, since it is no more necessary to manage a mixing and storage tank and the efficiency in terms of separation of the dry fraction from the liquid fraction is improved compared to the known treatment systems.
- In fact, the invention provides a mixing system that improves water retention from sludge, thus increasing the quantity of dry product obtainable.
- Moreover, the invention provides a mixing system that is capable of reducing waiting times before the beginning of the action of the polymer in solution on the fluid to be treated, consequently improving the effectiveness of the polymer itself; this has been obtained by introducing the chemical additive directly in the fluid to be treated and subjecting both of them to a mixing action produced by the stirring blades.
- Furthermore, the invention provides a compact mixing system that can be easily set up also in existing waste water purification or treatment systems or sludge drying systems.
- Furthermore, the invention provides a mixing system that limits the proliferation of bacteria on the same polyelectrolytes, thanks to the direct introduction of the same polyelectrolytes directly in the fluid to be treated, without providing for a storage period before use.
- The invention conceived in this way can be subjected to several modifications and variants, all falling within the inventive concept disclosed herein; furthermore, all the details can be replaced by other technically equivalent elements.
- In practice, any components and any materials can be used, provided that they are compatible with the intended use, and any shape and size can be selected, according to the needs and the state of the art.
- Where the characteristics and techniques mentioned in any of the claims are followed by reference signs, it must be understood that these reference signs are used only for the purpose of making the claims easier to understand, and consequently these reference signs do not have any limiting effect on the interpretation of each element identified by way of example by the same reference signs.
Claims (10)
- Mixing system (10) for the introduction of chemical substances in a fluid to be treated, comprising:- a container (11) comprising an external wall (12), an internal wall (13), a bottom (14) and a cover (15),- at least two concentric mixing chambers, a first central chamber (16) defined within said internal wall (13) and a second chamber (17) defined outside said internal wall (13), said first chamber (16) and second chamber (17) being in communication with each other,- an inlet duct (19) for a fluid to be treated, configured for the introduction of said fluid from the outside into said first chamber (16),- an outlet duct (20) for said treated fluid, configured for the outflow of said fluid from said second chamber (17) to the outside of said container (11),said inlet duct (19), first chamber (16), second chamber (17) and outlet duct (20) being configured to define a labyrinthine mixing path (30),- stirring blades (18) positioned inside said first chamber (16), operated by drive means through a rotation shaft (21),- at least one injection passage (22) for the introduction of a chemical additive in one or more points of said labyrinthine mixing path (30),characterized in that said inlet duct (19) is positioned below said outlet duct (20) with respect to a configuration of use of said mixing system (10),- said stirring blades (18) comprising at least one first group of blades (18a),- said first group of blades (18a) being positioned below said inlet duct (19) with respect to a configuration of use of the mixing system (10).
- Mixing system according to claim 1, characterized in that said drive means comprise a motor (35) configured to set said rotation shaft (21) rotating, wherein said rotation shaft (21) carries said stirring blades (18).
- Mixing system according to one or more of the preceding claims, characterized in that said first chamber (16) and second chamber (17) are in communication with each other through at least one passage opening (37) defined at the level of one end of said internal wall (13).
- Mixing system according to claim 3, characterized in that a first passage opening (37) is defined by a lower recirculation space between a lower end (13a) of said internal wall (13) and said bottom (14).
- Mixing system according to one or more of claims 3 and 4, characterized in that a second passage opening (38) is defined by an upper recirculation space between an upper end (13b) of said internal wall (13) and said cover (15).
- Mixing system according to one or more of the preceding claims, characterized in that it comprises a flow deviation element (40) configured to deviate said fluid flowing out of said first chamber (16) towards said second chamber (17).
- Mixing system according to one or more of the preceding claims, characterized in that said at least one injection passage (22) comprises an injection pipe (22a) directly connected to said inlet duct (19).
- Mixing system according to one or more of the preceding claims, characterized in that said at least one injection passage (22) comprises an injection pipe (22b) directly connected to said first chamber (16).
- Mixing system according to one or more of the preceding claims, characterized in that said at least one injection passage (22) comprises an injection pipe (22c) directly connected to said second chamber (17).
- Mixing system according to one or more of the preceding claims, characterized in that said container (111) comprising an external wall (112), an internal wall (113), a bottom (114) and a cover (115) comprises also an intermediate wall (150), said intermediate wall (150) defining, together with said external wall (112) and with said internal wall (113), three concentric mixing chambers, a first central chamber (116) defined within said internal wall (113), a second intermediate chamber (117) that surrounds said first chamber (116) and a third external chamber (153) that surrounds said second chamber (117).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL19198702T PL3626336T3 (en) | 2018-09-21 | 2019-09-20 | Mixing system for the introduction of chemical substances in a fluid to be treated |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT201800008821 | 2018-09-21 |
Publications (2)
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EP3626336A1 true EP3626336A1 (en) | 2020-03-25 |
EP3626336B1 EP3626336B1 (en) | 2021-09-01 |
Family
ID=64607120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19198702.3A Active EP3626336B1 (en) | 2018-09-21 | 2019-09-20 | Mixing system for the introduction of chemical substances in a fluid to be treated |
Country Status (4)
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EP (1) | EP3626336B1 (en) |
ES (1) | ES2898393T3 (en) |
PL (1) | PL3626336T3 (en) |
PT (1) | PT3626336T (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4122587A1 (en) | 2021-06-30 | 2023-01-25 | Spcm Sa | Improved mixing system for the introduction of chemical substances in a fluid to be treated |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US2577856A (en) | 1944-07-15 | 1951-12-11 | Standard Oil Dev Co | Polymerization reaction vessel |
US3392963A (en) | 1965-12-23 | 1968-07-16 | Stamicarbon | Reactor vessel with a mixing device |
US3737288A (en) | 1971-06-18 | 1973-06-05 | Exxon Co | Antifouling deflector in olefin polymerization reactors |
GB2136304A (en) * | 1983-02-24 | 1984-09-19 | Outokumpu Oy | A method of oxidizing sludge using a counterbubble reactor |
US4719252A (en) * | 1986-07-22 | 1988-01-12 | Drew Chemical Co. | Process and apparatus for forming polymeric solutions |
US5314076A (en) | 1991-02-04 | 1994-05-24 | Gie Anjou-Recherche | Installation for the mixing of two fluid phases by mechanical stirring, notably for the treatment of water by transfer of oxidizing gas, and use of such an installation |
US20120199524A1 (en) | 2011-02-09 | 2012-08-09 | Ccs Midstream Services, Llc. | Method and apparatus for treating well flow-back and produced water or other wastewater |
-
2019
- 2019-09-20 ES ES19198702T patent/ES2898393T3/en active Active
- 2019-09-20 EP EP19198702.3A patent/EP3626336B1/en active Active
- 2019-09-20 PT PT191987023T patent/PT3626336T/en unknown
- 2019-09-20 PL PL19198702T patent/PL3626336T3/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2577856A (en) | 1944-07-15 | 1951-12-11 | Standard Oil Dev Co | Polymerization reaction vessel |
US3392963A (en) | 1965-12-23 | 1968-07-16 | Stamicarbon | Reactor vessel with a mixing device |
US3737288A (en) | 1971-06-18 | 1973-06-05 | Exxon Co | Antifouling deflector in olefin polymerization reactors |
GB2136304A (en) * | 1983-02-24 | 1984-09-19 | Outokumpu Oy | A method of oxidizing sludge using a counterbubble reactor |
US4719252A (en) * | 1986-07-22 | 1988-01-12 | Drew Chemical Co. | Process and apparatus for forming polymeric solutions |
US5314076A (en) | 1991-02-04 | 1994-05-24 | Gie Anjou-Recherche | Installation for the mixing of two fluid phases by mechanical stirring, notably for the treatment of water by transfer of oxidizing gas, and use of such an installation |
US20120199524A1 (en) | 2011-02-09 | 2012-08-09 | Ccs Midstream Services, Llc. | Method and apparatus for treating well flow-back and produced water or other wastewater |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4122587A1 (en) | 2021-06-30 | 2023-01-25 | Spcm Sa | Improved mixing system for the introduction of chemical substances in a fluid to be treated |
Also Published As
Publication number | Publication date |
---|---|
PL3626336T3 (en) | 2022-01-31 |
PT3626336T (en) | 2021-11-15 |
ES2898393T3 (en) | 2022-03-07 |
EP3626336B1 (en) | 2021-09-01 |
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