CA2243574A1 - Water operated apparatus for the collection and sedimentation of paint particles - Google Patents
Water operated apparatus for the collection and sedimentation of paint particles Download PDFInfo
- Publication number
- CA2243574A1 CA2243574A1 CA002243574A CA2243574A CA2243574A1 CA 2243574 A1 CA2243574 A1 CA 2243574A1 CA 002243574 A CA002243574 A CA 002243574A CA 2243574 A CA2243574 A CA 2243574A CA 2243574 A1 CA2243574 A1 CA 2243574A1
- Authority
- CA
- Canada
- Prior art keywords
- flow channel
- water
- weirs
- flow
- paint particles
- 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.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0066—Settling tanks provided with contact surfaces, e.g. baffles, particles with a meandering flow pattern of liquid or solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/10—Venturi scrubbers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
- B05B14/462—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material and separating the excess material from the washing liquid, e.g. for recovery
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F2103/14—Paint wastes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
Abstract
A water-operated apparatus collects and sediments paint particles in a mixture of water and paint particles that are either floating on dispersed and which are adhering to each other, includes a flow channel and quiescent zones, and a return flow pipe connected to the flow channel. A number of weirs are arranged in the form of a cascade. The weirs interrupt the flow in the flow channel, and the water flows over them.
Description
CA 02243~74 1998-07-24 Water operated apparatus for the collection a~d sedimentation of paint particles The present invention relates to a water-operclted apparatus for the collection and sedimentation of paint particles in a mixture of water and pairt particles that are either suspended or floating and which are adhering to each ctherf with a flow channel and quiescent ~ones, and wlth a retu~ll flow pipe that is connected to the flow channel.
Water-operated apparatus that are arranged beneath one wall of a spray-painting cabln or a spray-painting stand, that is l~ constantly flushed w~th water, and which Wâsh out paint mist during the paint.ng process, are already know~ (EP 0 529 151 B1).
These known apparatus incorporate a ransverse channel at the out-flow end and this is adjacent to a f_ow edge of a water-collection basin that is flushed in the transverse direction. The 2() transverse channel is formed with an essentidlly hori20ntal flow seclion, at least ln the water-entry s~de cf the transversely flushed area of the rlow edge, and the outflcw slope is adjacent to this. The paint particles adhere to each c:ther, with the result that they stick to each other and fl.o~t on the surface of the wate~ ln patches, are not wetted, and for t~Lis reason do not form a sediment.
Desplte the addit_on of -, surfactant to the vv~ter, this S phenomenon remairls because this known wate--~erated apparatus does not wet the paint particles sufficientl~l and totally. The dry surface of the paint, which extends abov~- the waLer, remains tacky and allows additional paint particles to stick to it, so that these agglomerate tG form a thic~ and continuous layer of paint. At a certain size, the weight of this accumulation of paint sludge is greater han its buoyancy an~ it sinks to the bottom, after whL n it can only be removed manually.
Accordingly, the task is to ensure that unwetted and extremely 1~ adhesive floating paint sludge that is no we ted is no longer formed in a wate~-operated apparatus.
This problem has beer. so'ved by a water-oper~-ted apparatus of tht type described in the introduction hereto, this beirg characterised in that the apparatus is provlded with at least one weir that interrupts the flow through the fl~)w channel and over which the water passes.
CA 02243~74 1998-07-24 Th-s weir, which lS not simply an edge over w~1ich the water flows, generates an undertow that picks up the paint particles, submerses them, breaks them up, and wets the~.
In addition, a coagulant can be added to the ~ater; as is known, th_s reduces the tackiness of the paint partl~les although despite this, because of weak adhesive forces, this simplifies coagulation and c-lumping of the paint particles that have se~tled.
n It is an advanta~le if not only one we r, but rather a plurality of weirs, be arranged in series, one after the other, in the manner of a cascade. When this is done, it is preferred that the overflow level from one weir to the othe- differs by 0.05 to 0.2 1~ me ~es. It is important that a reversing un(iertow be formed after one such weir or after each weir, with.n which floating paint particles can be drawn into and beiow the water so that they are wetted and no longer float.
In the normal cc~lrse of events, three to six such weirs are su~~icient to wet all the floating and c~alesced pairt particles an~ cause them t~ sink.
In order to reduce the space that is require~-, it is proposed that the flow channel be configured so as to follow a meandering CA 02243~74 1998-07-24 path, with the wel'-S being located preferabl~ in the areas where this meander path changes direction. The change in direction of the flow channel at these meander polnts should be 180~ at each such point.
A quiescent zone is formed in front of each weir and some of the paint particles will form a sediment in this ~one. The sludge that has formed c)n the bottom can be removed from these areas by means of suitable slides or tub-type conveyors. For this reason, the standard ver~sion is characterised by weirs that consist of a rebound wall tha+~ extends down to the bottom of the flow channel.
Removal of the sludge is rendered simpler in one version in which at least some of the weirs are formed by a combination of impact walls that consists, in each instance, o- a first impact wall that extends dowrl ~o the bot+om of the flow (-har.nel and a subsequent impact wall, the lower edge of wh:ich does not extend to the bottom of +he channel so that there is a gap between its lower edge and the bottom of the channel. ~hls creates a flow in which some of the sludge that sinks +-c, the bcttom oollects in front of the impa-+ wall that extends as far ac the boltom of the channel. The sludge can then be removec from this posi~ion. If the first impact wall is arranged so that it can be raised and lowered, when the impact wall is raised, the sludge can be 2~ flushed into the end area of the flow channe:, from where it car CA 02243~74 1998-07-24 be removed after it has been allowed to se tle. To this end, suitable pumps can also be installed to draw the deposited sludge downward.
In order to provlde for further deflect:~on cf the flow, the bottom of the flow channel can incorporate bGttom un~ulations or bottom steps so that the resulting undertow -s lntensified. Such bottom undulations should in each instance be arranged such that their crests lie n front of a weir.
Since, according ~o the present invention, t~l~ paint-particle mixture still con~ains gas, it is proposed th~t a venturi scrubber be arranged at the beginning of the flow channels, in the vicinity of c)r above the first weir, in order to remove fine dust from the unt~eated gas.
Embodiments of the present lnventiGn wil~ be ~escribed in greater detail below on the basis of the drawingc appended hereto. These draw ngs show the following:
Figure 1: a diagrammatlc view of a water-oper~ted apparatus that is adjacent o a spray-pair.tinc ca~.n wall tha is sprayed with water.
Figure 2: a diagr-arnmat c view of an apparatuC wlth a flow channe' in the form of a meandering path;
Figure 3: an embodlment of a flow chcnne Wlt-n bottom undulatlons;
Figure ~: an embodiment of a flow channel with bottom steps.
Figure 1 shows a wall 2 of a spray-palnting cabin that is sprayed with water, on wh ch paint particles that or-~ nate from a paint mist are deposited and routed downwards throu~h a mesh base 3 together with the water from the spray. The water 200 with the paint particles collects in a drain trough ~ and flows over an inclined overflow edge 8, strikes a drain slope 9, and then flows into the flow channel 100. There ls an opening between the overflow edge 8 and the drain slope 9. F_ne, dust-like particles of paint that are present in the drain water can be drawn of through this venturi scrubber ll and suitabl~ separated. A drain channel 11' is provided for this purpose.
Figure 1 shows a low channel 100 that comprlseC a plurality of sections that are arranged linearly one behind the other, each Gf which is defined by a weir 10.1, 10.2, 10.3, and 10.4. The water flows over these weirs. In the embodimeIlt that is shown in Figure 1, the we r comprises a lower lmpact ~all 5.1, 5.2 that stands on the bottom of the flow channel 100, and a subsequent impact wall 6.2, 6.2, the lower ed~e of whlc~ does not extend as far down as the bottom cf the flow channel 1(0 so that there is gap between the lower ecge and the bottom of the flow channel.
CA 02243~74 1998-07-24 The impact wall ~,.1, 6.2 is manufactured froI[l two separate metal sheets that are joined together in order to m~}e it simpler to vary the height of the wall.
The water passes from the drain slope 9 t~ a quiescent zone 1 in front of the first impact wall 5. The water then flows on and becomes an undertow 16 that pulls the floatin~ paint-particle patches beneath the water and compresses them so that they break up and become wetted. The paint particles thâ~ are now sinking in the quiescent zone 1' build up in front of the lmpact wall 5.2.
Additional water passes over the next impact wall of the weir 10.2, the overflow level differing by approx.~ately 0.05 to 0.2 metres. This cascade arrangement of the we rs with an overflow level that grows e~er lower results in the paint patrhes that are l~ adhering together becoming wetted and submerg~d, and these then break up and form a sediment, so that on'y a few paint particles are still settling to ~he bottom or floa~ing ~n the surface at the end of the cascade arrangement, lr the area of t:he quiescent zoIle 21.
The water, from which most O r the pairt particles have been removed by this point, then passes through ar. inlet 15 of a pum~
12 that is connected to a return line 13, an(~ is returned to th~
water in the flow channel at the point numbe-e~ 200. Only the CA 02243~74 1998-07-24 small quantity of water that is lost as a result of residual moisture and evaporation must be made up on ~ continuing basis.
Environmental-pro~ection legislation require that the wall of the spray-painting cabin that is sprayed with water and the component parts of the flow channel be located within a protective catch basin 14.
Figure 2 shows a plan view of a water-operate~ apparatus as is shown in Figure 1 and which is based on the same principles. The flow channel 100 ~s in the form of a meander ng path. Weirs, similar to those shown in Figure 1, are preferably located in the areas where the meandering path changes direction at 24.1 and 24.2. As in Figure 1, the weirs 10.1 and 10~2, and any others, 1~ consist of a lower impact wall 5.1 anc a subsequent impact wall 6.-, so that the parti les that sink to the ~ttom will accumulates here, ~oo.
In he embodiments tha are shown n Figu~e and Figure 2, the helght of the front (lower) impact wa~l 5. , 5. 2 can be adjusted. For th s ~eason, when the low of ~ater is cut off, a flushing flow can be generated such that once the impact walls 5.1, 5.2 have been raised, the paint sludge that has collected in front of these impact walls can be flushed irito the area of the qulescent zone 2L! where it collects and fro~. where it can be removed by a sump pump or by a chain conveyor (not shown herein).
It should be notedr in particular, that operation in the sense of the present inventlon is also possible if. the weirs consist only of impact walls that rest on the bottom or which are so arranged that there is a space between their lower edges and the bottom.
Figure 3 shows ar embo~lmer.t ln whlch the bot:tom of the flow channel, which can be rectil_near, curvecl, or ln the form of a meandering path, can also be provided with ~ctt3m undulations 18 that are so arranged that there is a quiescent zone in front of l~ the impact walls, whereas the flow path s re,tricted after the impact walls, since thls permits ~mprcvecl entrainment and wetting of the paint part::~cles.
The crest 17 of the bottom undulations referred to above should in each instance be -n f:ront of the weirs.
Figure ~ shows c further embo~imerlt. ln th~s, tLle cascade-like arrangement of the weirs is such that the mp~ct wal:Ls that are set at a specific distance from the bottcm are each arranged at 2~ the end of a bottom step 19 that ends in a fa11 area 19'.
The height of the impact walls 10. 1,..., 10.3 can be adjustable or they can be set on the bottom in t~Le form ~f dams so that an undertow 16 is formed above them.
The sludge that forms in the sump 22 can be crawn off with a sump pump 23 and a draln pipe 25, and then be passed on for disposal or for recycling.
The manner in wh ch the apparatus acccrdlng t~ the p:resent lo invention ope~ates w~ now be described b~lefly once again:
The water passing ~rom t:he drain trough ~ mixes with the un-processed gas and _s intensively swir_ed n ~e fo:llowin~ venturi scrubber; it then passes to the first we.r 1(~.1, after which it 1~ moves into the qulescent zone 1, where the f rst sed.imentation of the sludge takes p_ace. The floating paint-particle patches 26 are drawn into the undertow 16, submerged, arld broken up by the turbulence and the buoyancy forces that are a-tlng there. They are easily wetted and coagulate and fcrm a slldge sediment in the 2n cuiescent zone 1'. The subsequent cascade-li~:e weirs provide additional undert:ows and thus ensure that:. th~ remaining paint-particle patches are wet-ted.
The paint sludge hat co.llects is remcvec elt.~er by a tub-type 2~ conveyor or by a suitable sump-pump system. 1'~ one particular embodiment, it is also possible to flush the paint particles intc a special, rear, quiescent a~ea that is provided wit:h a sump pump (see Figure 4).
Water losses and water contamination are kept at low levels by recirculating the water.
Reference numbers 100 --low channel.
200 water 2 water-sprayed wal:l of spray-palntlng cabin 3 mesh bottom 4 drain trough 5 first, lower impa(-t wall 5', 5" quiescent zone 6 second impact wal:l 7 inlet pipe R overflow edge 9 drain slope 10.1...10.4 weir -1 venturi scrubber '1' drain chdnnel _2 pump _3 return line :4 protective catch basln :5 inlet :6 undertow ~7 crest of bottom undulatlon :8 bottom undulatio '9 bottom s~ep ~9' fall area 20 gas remova' 21 quiescen~ zone 23 sludge-removal pump 24.1...24.9 meande- curves 25 drain pipe 3() ~6 pa~nt-part-cle patch
Water-operated apparatus that are arranged beneath one wall of a spray-painting cabln or a spray-painting stand, that is l~ constantly flushed w~th water, and which Wâsh out paint mist during the paint.ng process, are already know~ (EP 0 529 151 B1).
These known apparatus incorporate a ransverse channel at the out-flow end and this is adjacent to a f_ow edge of a water-collection basin that is flushed in the transverse direction. The 2() transverse channel is formed with an essentidlly hori20ntal flow seclion, at least ln the water-entry s~de cf the transversely flushed area of the rlow edge, and the outflcw slope is adjacent to this. The paint particles adhere to each c:ther, with the result that they stick to each other and fl.o~t on the surface of the wate~ ln patches, are not wetted, and for t~Lis reason do not form a sediment.
Desplte the addit_on of -, surfactant to the vv~ter, this S phenomenon remairls because this known wate--~erated apparatus does not wet the paint particles sufficientl~l and totally. The dry surface of the paint, which extends abov~- the waLer, remains tacky and allows additional paint particles to stick to it, so that these agglomerate tG form a thic~ and continuous layer of paint. At a certain size, the weight of this accumulation of paint sludge is greater han its buoyancy an~ it sinks to the bottom, after whL n it can only be removed manually.
Accordingly, the task is to ensure that unwetted and extremely 1~ adhesive floating paint sludge that is no we ted is no longer formed in a wate~-operated apparatus.
This problem has beer. so'ved by a water-oper~-ted apparatus of tht type described in the introduction hereto, this beirg characterised in that the apparatus is provlded with at least one weir that interrupts the flow through the fl~)w channel and over which the water passes.
CA 02243~74 1998-07-24 Th-s weir, which lS not simply an edge over w~1ich the water flows, generates an undertow that picks up the paint particles, submerses them, breaks them up, and wets the~.
In addition, a coagulant can be added to the ~ater; as is known, th_s reduces the tackiness of the paint partl~les although despite this, because of weak adhesive forces, this simplifies coagulation and c-lumping of the paint particles that have se~tled.
n It is an advanta~le if not only one we r, but rather a plurality of weirs, be arranged in series, one after the other, in the manner of a cascade. When this is done, it is preferred that the overflow level from one weir to the othe- differs by 0.05 to 0.2 1~ me ~es. It is important that a reversing un(iertow be formed after one such weir or after each weir, with.n which floating paint particles can be drawn into and beiow the water so that they are wetted and no longer float.
In the normal cc~lrse of events, three to six such weirs are su~~icient to wet all the floating and c~alesced pairt particles an~ cause them t~ sink.
In order to reduce the space that is require~-, it is proposed that the flow channel be configured so as to follow a meandering CA 02243~74 1998-07-24 path, with the wel'-S being located preferabl~ in the areas where this meander path changes direction. The change in direction of the flow channel at these meander polnts should be 180~ at each such point.
A quiescent zone is formed in front of each weir and some of the paint particles will form a sediment in this ~one. The sludge that has formed c)n the bottom can be removed from these areas by means of suitable slides or tub-type conveyors. For this reason, the standard ver~sion is characterised by weirs that consist of a rebound wall tha+~ extends down to the bottom of the flow channel.
Removal of the sludge is rendered simpler in one version in which at least some of the weirs are formed by a combination of impact walls that consists, in each instance, o- a first impact wall that extends dowrl ~o the bot+om of the flow (-har.nel and a subsequent impact wall, the lower edge of wh:ich does not extend to the bottom of +he channel so that there is a gap between its lower edge and the bottom of the channel. ~hls creates a flow in which some of the sludge that sinks +-c, the bcttom oollects in front of the impa-+ wall that extends as far ac the boltom of the channel. The sludge can then be removec from this posi~ion. If the first impact wall is arranged so that it can be raised and lowered, when the impact wall is raised, the sludge can be 2~ flushed into the end area of the flow channe:, from where it car CA 02243~74 1998-07-24 be removed after it has been allowed to se tle. To this end, suitable pumps can also be installed to draw the deposited sludge downward.
In order to provlde for further deflect:~on cf the flow, the bottom of the flow channel can incorporate bGttom un~ulations or bottom steps so that the resulting undertow -s lntensified. Such bottom undulations should in each instance be arranged such that their crests lie n front of a weir.
Since, according ~o the present invention, t~l~ paint-particle mixture still con~ains gas, it is proposed th~t a venturi scrubber be arranged at the beginning of the flow channels, in the vicinity of c)r above the first weir, in order to remove fine dust from the unt~eated gas.
Embodiments of the present lnventiGn wil~ be ~escribed in greater detail below on the basis of the drawingc appended hereto. These draw ngs show the following:
Figure 1: a diagrammatlc view of a water-oper~ted apparatus that is adjacent o a spray-pair.tinc ca~.n wall tha is sprayed with water.
Figure 2: a diagr-arnmat c view of an apparatuC wlth a flow channe' in the form of a meandering path;
Figure 3: an embodlment of a flow chcnne Wlt-n bottom undulatlons;
Figure ~: an embodiment of a flow channel with bottom steps.
Figure 1 shows a wall 2 of a spray-palnting cabin that is sprayed with water, on wh ch paint particles that or-~ nate from a paint mist are deposited and routed downwards throu~h a mesh base 3 together with the water from the spray. The water 200 with the paint particles collects in a drain trough ~ and flows over an inclined overflow edge 8, strikes a drain slope 9, and then flows into the flow channel 100. There ls an opening between the overflow edge 8 and the drain slope 9. F_ne, dust-like particles of paint that are present in the drain water can be drawn of through this venturi scrubber ll and suitabl~ separated. A drain channel 11' is provided for this purpose.
Figure 1 shows a low channel 100 that comprlseC a plurality of sections that are arranged linearly one behind the other, each Gf which is defined by a weir 10.1, 10.2, 10.3, and 10.4. The water flows over these weirs. In the embodimeIlt that is shown in Figure 1, the we r comprises a lower lmpact ~all 5.1, 5.2 that stands on the bottom of the flow channel 100, and a subsequent impact wall 6.2, 6.2, the lower ed~e of whlc~ does not extend as far down as the bottom cf the flow channel 1(0 so that there is gap between the lower ecge and the bottom of the flow channel.
CA 02243~74 1998-07-24 The impact wall ~,.1, 6.2 is manufactured froI[l two separate metal sheets that are joined together in order to m~}e it simpler to vary the height of the wall.
The water passes from the drain slope 9 t~ a quiescent zone 1 in front of the first impact wall 5. The water then flows on and becomes an undertow 16 that pulls the floatin~ paint-particle patches beneath the water and compresses them so that they break up and become wetted. The paint particles thâ~ are now sinking in the quiescent zone 1' build up in front of the lmpact wall 5.2.
Additional water passes over the next impact wall of the weir 10.2, the overflow level differing by approx.~ately 0.05 to 0.2 metres. This cascade arrangement of the we rs with an overflow level that grows e~er lower results in the paint patrhes that are l~ adhering together becoming wetted and submerg~d, and these then break up and form a sediment, so that on'y a few paint particles are still settling to ~he bottom or floa~ing ~n the surface at the end of the cascade arrangement, lr the area of t:he quiescent zoIle 21.
The water, from which most O r the pairt particles have been removed by this point, then passes through ar. inlet 15 of a pum~
12 that is connected to a return line 13, an(~ is returned to th~
water in the flow channel at the point numbe-e~ 200. Only the CA 02243~74 1998-07-24 small quantity of water that is lost as a result of residual moisture and evaporation must be made up on ~ continuing basis.
Environmental-pro~ection legislation require that the wall of the spray-painting cabin that is sprayed with water and the component parts of the flow channel be located within a protective catch basin 14.
Figure 2 shows a plan view of a water-operate~ apparatus as is shown in Figure 1 and which is based on the same principles. The flow channel 100 ~s in the form of a meander ng path. Weirs, similar to those shown in Figure 1, are preferably located in the areas where the meandering path changes direction at 24.1 and 24.2. As in Figure 1, the weirs 10.1 and 10~2, and any others, 1~ consist of a lower impact wall 5.1 anc a subsequent impact wall 6.-, so that the parti les that sink to the ~ttom will accumulates here, ~oo.
In he embodiments tha are shown n Figu~e and Figure 2, the helght of the front (lower) impact wa~l 5. , 5. 2 can be adjusted. For th s ~eason, when the low of ~ater is cut off, a flushing flow can be generated such that once the impact walls 5.1, 5.2 have been raised, the paint sludge that has collected in front of these impact walls can be flushed irito the area of the qulescent zone 2L! where it collects and fro~. where it can be removed by a sump pump or by a chain conveyor (not shown herein).
It should be notedr in particular, that operation in the sense of the present inventlon is also possible if. the weirs consist only of impact walls that rest on the bottom or which are so arranged that there is a space between their lower edges and the bottom.
Figure 3 shows ar embo~lmer.t ln whlch the bot:tom of the flow channel, which can be rectil_near, curvecl, or ln the form of a meandering path, can also be provided with ~ctt3m undulations 18 that are so arranged that there is a quiescent zone in front of l~ the impact walls, whereas the flow path s re,tricted after the impact walls, since thls permits ~mprcvecl entrainment and wetting of the paint part::~cles.
The crest 17 of the bottom undulations referred to above should in each instance be -n f:ront of the weirs.
Figure ~ shows c further embo~imerlt. ln th~s, tLle cascade-like arrangement of the weirs is such that the mp~ct wal:Ls that are set at a specific distance from the bottcm are each arranged at 2~ the end of a bottom step 19 that ends in a fa11 area 19'.
The height of the impact walls 10. 1,..., 10.3 can be adjustable or they can be set on the bottom in t~Le form ~f dams so that an undertow 16 is formed above them.
The sludge that forms in the sump 22 can be crawn off with a sump pump 23 and a draln pipe 25, and then be passed on for disposal or for recycling.
The manner in wh ch the apparatus acccrdlng t~ the p:resent lo invention ope~ates w~ now be described b~lefly once again:
The water passing ~rom t:he drain trough ~ mixes with the un-processed gas and _s intensively swir_ed n ~e fo:llowin~ venturi scrubber; it then passes to the first we.r 1(~.1, after which it 1~ moves into the qulescent zone 1, where the f rst sed.imentation of the sludge takes p_ace. The floating paint-particle patches 26 are drawn into the undertow 16, submerged, arld broken up by the turbulence and the buoyancy forces that are a-tlng there. They are easily wetted and coagulate and fcrm a slldge sediment in the 2n cuiescent zone 1'. The subsequent cascade-li~:e weirs provide additional undert:ows and thus ensure that:. th~ remaining paint-particle patches are wet-ted.
The paint sludge hat co.llects is remcvec elt.~er by a tub-type 2~ conveyor or by a suitable sump-pump system. 1'~ one particular embodiment, it is also possible to flush the paint particles intc a special, rear, quiescent a~ea that is provided wit:h a sump pump (see Figure 4).
Water losses and water contamination are kept at low levels by recirculating the water.
Reference numbers 100 --low channel.
200 water 2 water-sprayed wal:l of spray-palntlng cabin 3 mesh bottom 4 drain trough 5 first, lower impa(-t wall 5', 5" quiescent zone 6 second impact wal:l 7 inlet pipe R overflow edge 9 drain slope 10.1...10.4 weir -1 venturi scrubber '1' drain chdnnel _2 pump _3 return line :4 protective catch basln :5 inlet :6 undertow ~7 crest of bottom undulatlon :8 bottom undulatio '9 bottom s~ep ~9' fall area 20 gas remova' 21 quiescen~ zone 23 sludge-removal pump 24.1...24.9 meande- curves 25 drain pipe 3() ~6 pa~nt-part-cle patch
Claims (12)
1. A water-operated apparatus for the collection and sedimentation of paint particles in a mixture (200) of water and paint particles that are either floating on dispersed and which are adhering to each other, with a flow channel (100) and quiescent zones (21), and with a return flow pipe (13) that is connected to the flow channel, characterised in that the apparatus comprises a plurality of weirs (10.1, 10.2, 10.3, 10.4) that are arranged in the form of a cascade, interrupt the flow in the flow channel, and over which the water flows.
2. An apparatus as defined in Claim 1, characterised in that a coagulant is added to the water.
3. An apparatus as defined in Claim 1 or Claim 2, characterised in that the overflow level differs from one weir to another by 0.05 to 0.2m.
4. An apparatus as defined in Claim 1 to Claim 3, characterised in that three to six weirs (10) are arranged in the flow channel (100).
5. An apparatus as defined in Claim 1 to Claim 4, characterised in that the flow channel (100) follows a meandering path, with the weirs (10) preferably being located at the points (24.1, 24.2) where the meandering path changes direction.
6. An apparatus as defined in Claim 5, characterised in that the flow channel (100) changes direction by 180° at each point where the meandering path changes direction.
7. An apparatus as defined in Claim 1 to Claim 6, characterised in that at least some of the weirs consist of an impact wall (5), the lower edge of which is separated from the bottom by a space.
8. An apparatus as defined in Claim 1 to Claim 7, characterised in that some of the weirs are formed from a combination of impact walls that in each instance consists of a first, lower impact wall (5) that extends down to the bottom of the flow channel, and a subsequent impact wall (6) that is so arranged that there is a space between its lower edge and the bottom.
9. An apparatus as defined in Claim 8, characterised in that the lower impact wall (5) can be raised and lowered.
10. An apparatus as defined in at least one of the preceding Claims, characterised in that the bottom of the flow channel incorporates bottom undulations (18) or bottom steps (19).
11. An apparatus as defined in Claim 10, characterised in that the crest (17) of each of the bottom undulations lies in front of a weir (10).
12. An apparatus as defined in at least one of the preceding claims, characterised in that an apparatus (29) for removing fine dust is located at the beginning of the flow channel, above the (first) weir (10.1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732208A DE19732208C2 (en) | 1997-07-26 | 1997-07-26 | Water-operated device for picking up and settling paint particles |
| DE19732208.5 | 1997-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2243574A1 true CA2243574A1 (en) | 1999-01-26 |
Family
ID=7836982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002243574A Abandoned CA2243574A1 (en) | 1997-07-26 | 1998-07-24 | Water operated apparatus for the collection and sedimentation of paint particles |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0893163A3 (en) |
| CA (1) | CA2243574A1 (en) |
| DE (1) | DE19732208C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111001196A (en) * | 2019-12-25 | 2020-04-14 | 上海宝钢磁业有限公司 | System for recycling cold rolling acid to regenerate acid-containing slurry and method for recycling cold rolling acid |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10155759A1 (en) * | 2001-11-14 | 2003-05-22 | Henkel Gmbh | Device and method for cleaning the gratings of a painting booth |
| CN106890752A (en) * | 2017-04-07 | 2017-06-27 | 无锡锦绣轮毂有限公司 | One kind prevents paint slag precipitation pipeline structure |
| CN107371651A (en) * | 2017-09-01 | 2017-11-24 | 农业部环境保护科研监测所 | A kind of ensiling liquid collecting and transport device and collecting and transferring system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE242809C (en) * | ||||
| AT50271B (en) * | 1908-11-26 | 1911-10-25 | Lucien Linden | Water purification system. |
| DE1517645C3 (en) * | 1964-06-16 | 1978-06-01 | Daimler-Benz Ag, 7000 Stuttgart | Process for the deposition of so-called water-based paints |
| US4378290A (en) * | 1981-07-16 | 1983-03-29 | Kennedy Alvin B Jun | Modularized multi-stage separator system |
| US4818388A (en) * | 1986-12-09 | 1989-04-04 | Taikisha Ltd. | Paint waste separating and collecting apparatus |
| US4904393A (en) * | 1988-05-27 | 1990-02-27 | W. R. Grace & Co.-Conn. | Method for controlling overspray in paint spray booths |
| US5158678A (en) * | 1990-09-28 | 1992-10-27 | Broussard Paul C Sr | Water clarification method and apparatus |
| DE9110515U1 (en) | 1991-08-24 | 1991-11-28 | Ipsen, Harald, 6113 Babenhausen | Water collection tank of a spray booth |
| DE29514681U1 (en) * | 1995-09-13 | 1997-01-23 | Wesumat Gmbh | Plant for the treatment of waste water from car washes |
-
1997
- 1997-07-26 DE DE19732208A patent/DE19732208C2/en not_active Expired - Fee Related
-
1998
- 1998-07-22 EP EP98113637A patent/EP0893163A3/en not_active Withdrawn
- 1998-07-24 CA CA002243574A patent/CA2243574A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111001196A (en) * | 2019-12-25 | 2020-04-14 | 上海宝钢磁业有限公司 | System for recycling cold rolling acid to regenerate acid-containing slurry and method for recycling cold rolling acid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19732208C2 (en) | 2001-03-01 |
| DE19732208A1 (en) | 1999-01-28 |
| EP0893163A2 (en) | 1999-01-27 |
| EP0893163A3 (en) | 2000-12-06 |
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