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WO1993008922A1 - Procede pour la regulation et/ou la diminution de valeurs de viscosite et de dco genantes dans les liquides de coagulation des peintures - Google Patents

Procede pour la regulation et/ou la diminution de valeurs de viscosite et de dco genantes dans les liquides de coagulation des peintures Download PDF

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Publication number
WO1993008922A1
WO1993008922A1 PCT/EP1992/002477 EP9202477W WO9308922A1 WO 1993008922 A1 WO1993008922 A1 WO 1993008922A1 EP 9202477 W EP9202477 W EP 9202477W WO 9308922 A1 WO9308922 A1 WO 9308922A1
Authority
WO
WIPO (PCT)
Prior art keywords
viscosity
water
paint
sources
food sources
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.)
Ceased
Application number
PCT/EP1992/002477
Other languages
German (de)
English (en)
Inventor
Wolfgang Blank
Karl-Heinz Maurer
Wiltrud Proft
Thomas Molz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cognis Gesellschaft fuer Bio und Umwelt Technologie mbH
Original Assignee
Cognis Gesellschaft fuer Bio und Umwelt Technologie mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cognis Gesellschaft fuer Bio und Umwelt Technologie mbH filed Critical Cognis Gesellschaft fuer Bio und Umwelt Technologie mbH
Publication of WO1993008922A1 publication Critical patent/WO1993008922A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/71—Paint detackifiers or coagulants, e.g. for the treatment of oversprays in paint spraying installations
    • 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

Definitions

  • the water flows back into the paint booths with the addition of adsorbent.
  • adsorbent By supplying fresh water, the water losses caused by evaporation and by stripping off the paint sludge are compensated.
  • the sedimentation of the paint sludge takes place in older plants in larger sewage lakes, more modern plants work in largely closed systems.
  • microorganisms grow in the aqueous circulation systems.
  • microorganisms are of the order of magnitude
  • the teaching according to the invention is based on the concept of influencing the tendency of the microorganisms present in the lacquer coagulation water to regulate the formation of bio-mucus by regulating the nutrient situation.
  • the teaching of the invention aims to provide the possibility, in aqueous phases of the type concerned here, of being able to rapidly and sustainably reduce increased viscosity values which have already built up.
  • the teaching according to the invention also wants to open up the possibility of preventing the undesirable build-up of viscosity in the aqueous phase of such coating coagulation waters from the start.
  • Another important object of the teaching according to the invention is to open up the possibility of freeing aqueous phases of the type concerned here with already increased COD values from these undesirably increased COD values by specifically influencing the microbial growth.
  • the slime-forming problem germs isolated from paint coagulation water of different origins are obviously often identical to corresponding problem germs from other industrial processing areas of aqueous auxiliary liquids, for example from the paper industry.
  • a large number of slime formers known from the literature occur in abundance, in particular Agrobacterium radiobacter, Pseudomonads and Enterobacteriaceen.
  • the following typical mucus-forming germs were found: Serratia marcescens, Agrobacterium radiobacter, Flavobacterium indologenes, Pseudomonas spec, Chryseo onas luteola, Xanthomonas maltophilia.
  • the timing of slime formation during the culture of isolated strains was also examined. When a certain cell density is reached, a high one occurs within a few hours Slime production. The viscosity then remains constant at a high level over a long period of time.
  • the invention accordingly relates to a method for regulating the bacterially produced mucilage content and thus for regulating the viscosity and recyclability of lacquer coagulation water from the removal of the overspray when spray paints are applied.
  • the process according to the invention is characterized in that the content of microbial usable nitrogen (N) and phosphorus (P) in the lacquer coagulation water - hereinafter also referred to as "limiting food sources" - is increased and coordinated to such an extent that the formation pushed back by viscosity-increasing mucilages and / or already formed mucilaginous parts are broken down or consumed.
  • the concept according to the invention thus represents a departure from the measure which is customary in a broad technical scope of combating undesired microorganism growth and / or undesired secondary products of microorganism growth by using bioeids.
  • the core of the teaching according to the invention is to promote the microorganism growth by deliberately adding two limiting food sources in such a way that the desired results of lowering or regulating viscosity and lowering or preventing the build-up of high COD values become accessible.
  • the two limiting elements for the measures within the meaning of the invention are nitrogen and phosphorus-containing nutrients, it being possible for N and P to be made available in different nutrient suppliers by means of a nutrient supplier and / or separately from one another.
  • a first class relates to inorganic and / or organic and preferably water-soluble compounds of phosphorus and / or nitrogen which P or N in microbially rapidly usable form.
  • P inorganic and / or organic and preferably water-soluble compounds of phosphorus and / or nitrogen which P or N in microbially rapidly usable form.
  • N and, in particular, P are present in a second class of valuable materials in the sense of the inventive action in a form which represents a comparatively more slowly utilizable form of these limiting food sources.
  • the teaching according to the invention makes use of this state of affairs as follows:
  • the result of this action shows up as a practically immediately beginning degradation of the biological mucilage and thus practically immediately beginning lowering the viscosity of the lacquer coagulation water and / or lowering the COD value in the excess water.
  • limiting food sources of the type described If comparatively slower-acting or slower-utilizing limiting food sources of the type described are used, then initially - for example within the first few days - either no noticeable effect in the intended sense or even a promotion of the accumulation of microbial mucilages and thus an increase in viscosity his. Even in these cases, however, the desired effect of microbial degradation of the mucilage and / or the COD values is triggered after some time.
  • the use of these limiting food sources of the second class of substances described here will always be possible if the given circumstances permit such a delayed effect of the microbial metabolic processes.
  • the use of limiting food sources of the second type can be considered.
  • the claimed teaching combines the use of limiting food sources of the type concerned here from the two classes of substances mentioned, ie both fast-acting N and / or P suppliers and correspondingly delayed representatives of this type become used in a mixture with each other.
  • the most important representatives for N-suppliers with quick and preferably immediate effectiveness in the sense of the objective according to the invention are forms of supply which either contain the nitrogen in the form of the ammonium ion as preferred, readily water-soluble inorganic salts and / or selected water-soluble organic nitrogen compounds, here the Urea is of particular importance.
  • the suitable form of supply for rapidly usable phosphorus is in particular readily water-soluble salts of orthophosphoric acid. Partial salts of orthophosphoric acid have proven particularly useful here, with alkali metal and especially ammonium dihydrogen phosphate being the most important representatives in the sense of the action according to the invention.
  • a characteristic representative of a comparatively slower acting form of supply from the P suppliers are oligophosphate compounds and / or comparatively less water-soluble salts of orthophosphoric acid, for example calcium phosphate.
  • the most important representatives for the P-containing food sources with time-delayed release are the alkali metal tripolyphosphates and here in particular sodium tripolyphosphate.
  • Typical examples within the framework of the N suppliers mentioned above based on inorganic salts are alkali metal nitrates or nitrites such as NaNÜ3 or aN ⁇ 2 or ammonium salts , for example ammonium sulfate or ammonium bisulfate.
  • N suppliers with delayed release of the nitrogen are, in particular, organic N compounds, in which case aminocarboxylic acids - for example glutamic acid - of natural and / or synthetic origin can be of particular importance.
  • aminocarboxylic acids - for example glutamic acid - of natural and / or synthetic origin can be of particular importance.
  • any other components with organically bound nitrogen are also suitable, provided that they do not have toxic and / or biocidal effects.
  • additives to the paint coagulation water are used which are free of sulfur or sulfur compounds. While in itself a corresponding well water soluble Salt of sulfuric acid, for example ammonium sulfate, shows quite viscosity-regulating effects, odor nuisance can occur due to secondary microbial processes when using such salts containing sulfur. In the sense of the teaching according to the invention, it is preferred to work sulfur-free; Such secondary hazards are thus excluded.
  • the limiting P and N food sources are used when approximately the same quantitative ratios of P to N are used. This is not mandatory, however, it may be preferable to dose the limiting food sources accordingly. In particular in the case of the simultaneous use of P sources which can be used quickly and with a delay, a certain P excess can also be used in the context of a particularly suitable embodiment.
  • Substance mixtures of approximately equal parts by weight of NH4H2PO4., Urea and sodium tripolyphosphate have proven to be particularly suitable mixtures of active ingredients.
  • the content of limiting food sources which is added to the lacquer coagulation waters in the context of the teaching according to the invention is usually in the range from approximately 200 to 800 ppm based on the sum of N and P.
  • Particularly suitable addition quantities are in the range from approximately 300 to 500 ppm of the sum of N and P, here again - as stated above - approximately equal amounts of N and P added may be particularly preferred.
  • this control of microorganism growth is combined with the metering of biocidal compounds.
  • biocides are used to restrict the growth of microorganisms in coating coagulants, examples of which are: DBNPA (dibromonitrilopropionamide), MBT (methylene bisthiocyanate) r and those under the trade name “Kathon "Distributed isothiazo ion compound.
  • DBNPA dibromonitrilopropionamide
  • MBT methylene bisthiocyanate
  • Kathon distributed isothiazo ion compound.
  • Mucus control agents are used, as described for example in the relevant literature.
  • the use of these biocides can only be considered if, in particular as part of a one-off measure, an excessively strong build-up or development of microorganism growth is to be combated.
  • the "superphosphate” used in the context of this example is a monobasic calcium phosphate of technical nature with an available P2 ⁇ s content of 18 to 21%, which in addition to calcium phosphate, calcium sulfate and, in minor amounts, oxides of iron, silicon and contains aluminum.
  • Viscous paint coagulation water (with original mixed cultures) were the supplements calcium hydrogen phosphate (400 and 800 ppm), superphosphate (800 and 1600 ppm), ammonium dihydrogen phosphate (800 and 1600 ppm) and urea (100 and 200 ppm) added individually.
  • the batches with 100 ml of lacquer water were shaken in Erlenmeyer flasks at 150 rpm at room temperature and observed over 14 days. Viscosity-reducing effects of between 40 and 80% were achieved. The measurement was carried out using a Brookfield viscometer.
  • a mixture of sodium tripolyphosphate, ammonium dihydrogen phosphate and urea (400 ppm, 1: 1: 1) was added to non-viscous paint water with and without biocide (50 ppm Kathon WT). The batches were shaken (150 rpm) at room temperature over a period of 6 weeks.
  • the viscosity (prophylactically) can be kept at the value of the initial viscosity. Furthermore, it becomes clear that the use of biocide alone has no viscosity reducing effect. The simultaneous addition of a nutrient mixture and biocide shows no better effect than using the nutrient mixture alone (Fig. 12). The COD value of the batches treated with phosphate mixture after 6 and 9 days is significantly (70 and 55%) lower than the batches not treated with phosphate mixture (Fig. 13).

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

On décrit un procédé de régulation de la teneur en substances mucilagineuses d'origine bactérienne et, par conséquent, de régulation de la viscosité et des possibilités de recyclage des liquides de coagulation des peintures provenant de l'élimination de l'excédent de pulvérisation lors de l'application de peinture par pulvérisation. Le nouveau procédé est caractérisé en ce qu'on augmente et en ce qu'on adapte l'une par rapport à l'autre les teneurs des liquides de coagulation des peintures en azote et en phosphore récupérables par des procédés microbiens (sources de nourriture limitatives) dans une proportion permettant d'empêcher la formation de substances mucilagineuses augmentant la viscosité et/ou de diminuer par un processus bactérien les proportions de substances mucilagineuses déjà formées. L'invention a également pour objet de diminuer les valeurs de DCO dans les résidus des liquides de coagulation des peintures et/ou d'empêcher que des valeurs élevées soient atteintes.
PCT/EP1992/002477 1991-11-06 1992-10-29 Procede pour la regulation et/ou la diminution de valeurs de viscosite et de dco genantes dans les liquides de coagulation des peintures Ceased WO1993008922A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4136445A DE4136445A1 (de) 1991-11-06 1991-11-06 Verfahren zur regulierung und/oder zum abbau von unerwuenschten viskositaets und csb-werten in lackkoagulationswaessern
DEP4136445.7 1991-11-06

Publications (1)

Publication Number Publication Date
WO1993008922A1 true WO1993008922A1 (fr) 1993-05-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002477 Ceased WO1993008922A1 (fr) 1991-11-06 1992-10-29 Procede pour la regulation et/ou la diminution de valeurs de viscosite et de dco genantes dans les liquides de coagulation des peintures

Country Status (2)

Country Link
DE (1) DE4136445A1 (fr)
WO (1) WO1993008922A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7754023B2 (en) * 2004-12-03 2010-07-13 Ppg Industries Ohio, Inc. Compositions and methods using a microorganism concentrate for paint overspray removal processes
US8202424B2 (en) 2007-01-29 2012-06-19 Atotech Deutschland Gmbh Microbial degradation of water-borne paint containing high levels of organic solvent
KR101894113B1 (ko) 2010-08-20 2018-10-04 솔레니스 테크놀러지스 케이맨, 엘.피. 침착물 제거 및 방지용 에멀젼

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124850A1 (fr) * 1983-05-07 1984-11-14 Henkel Kommanditgesellschaft auf Aktien Usage de coagulants liquides neutres à un composé pour la coagulation de vernis et de matières de revêtement
WO1985003459A1 (fr) * 1984-02-07 1985-08-15 Kearney T J Traitement de l'eau de lavage dans des cabines de pulverisation de peinture
EP0295666A2 (fr) * 1987-06-15 1988-12-21 Rheox International, Inc. Procédé de réduction de l'adhésivité des restes pulverisés d'une peinture par application d'une argile organophile
US4853132A (en) * 1988-02-29 1989-08-01 Betz Laboratories, Inc. Paint spray booth treatment
WO1991009666A1 (fr) * 1989-12-22 1991-07-11 Unicolor Ag Procede de peinture par pulverisation menageant l'environnement, au moyen d'une dispersion dans l'eau d'un vernis a sechage au four

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124850A1 (fr) * 1983-05-07 1984-11-14 Henkel Kommanditgesellschaft auf Aktien Usage de coagulants liquides neutres à un composé pour la coagulation de vernis et de matières de revêtement
WO1985003459A1 (fr) * 1984-02-07 1985-08-15 Kearney T J Traitement de l'eau de lavage dans des cabines de pulverisation de peinture
EP0295666A2 (fr) * 1987-06-15 1988-12-21 Rheox International, Inc. Procédé de réduction de l'adhésivité des restes pulverisés d'une peinture par application d'une argile organophile
US4853132A (en) * 1988-02-29 1989-08-01 Betz Laboratories, Inc. Paint spray booth treatment
WO1991009666A1 (fr) * 1989-12-22 1991-07-11 Unicolor Ag Procede de peinture par pulverisation menageant l'environnement, au moyen d'une dispersion dans l'eau d'un vernis a sechage au four

Also Published As

Publication number Publication date
DE4136445A1 (de) 1993-08-26

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