EP4350073A1 - Procédé d'optimisation de l'état de circuits de machines à papier avec réacteurs anaérobies en aval - Google Patents

Procédé d'optimisation de l'état de circuits de machines à papier avec réacteurs anaérobies en aval Download PDF

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Publication number
EP4350073A1
EP4350073A1 EP23199514.3A EP23199514A EP4350073A1 EP 4350073 A1 EP4350073 A1 EP 4350073A1 EP 23199514 A EP23199514 A EP 23199514A EP 4350073 A1 EP4350073 A1 EP 4350073A1
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EP
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Prior art keywords
acidification
process according
paper machine
degree
paper
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23199514.3A
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German (de)
English (en)
Inventor
Birgit Baumgartner
Jeffrey Spedding
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Api Additives For Paper Industry GmbH
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Api Additives For Paper Industry GmbH
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Publication of EP4350073A1 publication Critical patent/EP4350073A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus

Definitions

  • the present invention relates to a method for the simultaneous control of microbiologically caused deposits, the degree of acidification and the dissolved calcium in paper machine systems which contain solid calcium carbonate, for example in the form of fillers or coating pigments, and in which the wastewater treatment is carried out by means of a downstream anaerobic process (in the anaerobic reactor).
  • the water circuits of paper machines provide suitable environmental conditions for the growth of a wide variety of microorganisms due to the available nutrient supply and the prevailing temperatures. Depending on various factors, such as the nutrients available or the oxygen available, these can be primarily aerobic, facultatively aerobic or anaerobic bacteria, which can cause complex problems.
  • Microbiologically caused deposits can be reduced or at least minimized by using oxidative biocides, conventional biocides, dispersants (consisting of one or more surfactants, solvents and stabilizers) or substances that protect the machine surface from deposits.
  • Oxidative biocides include halogens and halogen oxides, chlorine bleach and halogenamines, i.e. chloramines or bromine- or bromide-activated chloramine.
  • Dispersants or substances for protecting surfaces are used to prevent or reduce chemical deposits. These processes are known and described in various patents and literature.
  • EP0 517 360 discloses the addition of a hydrocarbon solvent together with at least one surfactant to the pulp of a papermaking plant which uses secondary fibers containing hot melt or pressure sensitive adhesive contamination.
  • an oil-in-water emulsion containing organic solvents and surfactants can be added to an aqueous system transporting solids, for example in a papermaking process, to prevent slime formation and reduce microbiological growth.
  • the US Patent 3,151,020 describes a method for preventing and controlling microorganisms in industrial process water systems. Among other things, the use of an aliphatic hydrocarbon in combination with an emulsifier and a polyhalogenated alkyl ester is proposed.
  • the EP 1 556 547 B1 The applicant proposes the use of dearomatized white spirit in combination with a surfactant and orange terpene to combat deposits in industrial water circuits. This cleaning agent is applied to the press felts to keep the felts clean and to improve the drainage of the wet paper fabric.
  • the EP 3 492 653 B1 also by the applicant, describes an online cleaner and a method for removing, preventing or at least reducing deposits in paper production plants that carry water and/or are in contact with water.
  • the online cleaner contains a hydrophobic organic solvent from the group of acetals and at least one surfactant and/or at least one chelating agent.
  • anaerobic part In contrast to municipal sewage treatment plants, the anaerobic part always precedes a final aerobic treatment. There are no digesters or digesters as in biogas plants, but rather there are various types of anaerobic reactors in which the microorganisms involved in the decomposition are organized in the form of so-called anaerobic pellets.
  • the anaerobic process is very attractive compared to purely aerobic wastewater treatment for several reasons: Due to the design of the reactors, the process requires comparatively little space, comparatively little biomass is produced that has to be disposed of and hardly any energy is required for required for operation. In particular, the resulting biogas can be used to generate energy.
  • Paper machines and anaerobic wastewater treatment are closely and integrally linked in terms of process technology. Additives added to the paper machine, especially biocides, can have a negative impact on the sensitive anaerobic process directly and/or indirectly. Little to inappropriate treatment of the PM circulating water has a negative impact on the anaerobic process.
  • the COD present in the machine circuit is introduced with the waste paper and is mainly caused by the high levels of starch present there (on average 4% of the weight of the waste paper).
  • This starch can be broken down by a variety of microorganisms into glucose, which is then further metabolized either aerobically with oxygen as the final electron acceptor or anaerobically, in the paper machine circuit mainly through fermentation processes.
  • VFA volatile fatty acids
  • C2 - acetic acid, C3 - propionic acid, C4 - valeric acid and isovaleric acid, C5 - butyric acid volatile fatty acids
  • C4 - valeric acid and isovaleric acid, C5 - butyric acid volatile fatty acids
  • hydroxycarboxylic acid lactic acid are formed in a first stage.
  • These are then partly converted into acetic acid in the PM cycle, to a large extent in so-called pre-acidification tanks between the paper machine and the anaerobic reactor and partly in the reactor itself, which is then used by so-called acetoclastic methanogens (archaea) to produce methane.
  • Solid calcium carbonate contributes to the weight of the paper, which means that a certain proportion of the raw material is lost when this solid is dissolved. If this can be partially prevented by an optimized process, it would mean more efficient use of the raw material waste paper and represent a major economic advantage.
  • the addition of oxygen or oxygen donors to the circulating water can reduce Substances are neutralized and the redox potential in the system water is increased, which results in the biocenosis in the cycle being shifted towards aerobic germs or facultative aerobic germs preferentially respiring oxygen.
  • Examples of possible agents here are blown-in air, pure oxygen or hydrogen peroxide.
  • the fermentation process is also influenced by the use of oxidative or organic biocides, regardless of whether these are added explicitly for the purpose of circuit conditioning or merely to combat slime.
  • redox enhancers or redox modifiers and oxidative and/or organic biocides in combination.
  • a synergistic effect is to be expected, since oxidative biocides in particular, but also some organic biocides, are neutralized by reducing substances, which are partially eliminated by the redox modifier.
  • the effect of the redox modifier is of course supported by a reduction in the number of bacteria or a reduction in bacterial activity in the circulation by a biocide (even if only during a dosing shock).
  • the WO 2013/145440 is concerned with the control of slime in the production of paper pulp.
  • An inorganic bactericide is used, the degradation of which, caused by reducing substances, is counteracted by the addition of sodium chlorite.
  • the EP 3 087 035 B1 also describes the combined use of a halogen amine with an alkali chlorite with the aim of lowering the pH value (hydrogen ion concentration) in the This acidification in the paper machine should be suppressed as far as possible and the dissolution of calcium carbonate should be completely or almost completely avoided.
  • pellets have an improved structure in the presence of certain amounts of lime.
  • a certain proportion of inorganic material also increases the specific weight of the pellets and thus counteracts undesirable pellet drift and sludge loss.
  • the object of the present invention is to keep the degree of acidification (degree of acidification (%)) in the machine circuit in a range which, on the one hand, reduces the dissolution of calcium (carbonate), but does not suppress it, and, on the other hand, provides the prerequisite with regard to the type and amount of fatty acids that in the pre-acidification (inlet to the anaerobic reactor) the desired or required degree of acidification is achieved.
  • the present invention solves this overall problem, namely satisfactory paper production with simultaneous efficient wastewater treatment, by adjusting selected process parameters using selected additives or additive combinations.
  • the present invention relates to a method for the simultaneous optimization of the condition of paper machines and downstream anaerobic reactors using targeted use of additives or additive combinations and in such quantities that a balancing of the degree of acidification between the paper machine and the inlet to the anaerobic reactor is achieved.
  • the degree of acidification (%) is to be understood as the total amount of acids (expressed as acetic acid equivalent in mg/l) in relation to the COD (chemical oxygen demand) (as O2 in mg/l).
  • the degree of acidification has proven to be a reliable indicator and a value that is easy to handle. Nevertheless, the values described and discussed here must not be ignored when taking measurements.
  • the required application quantities are determined by measuring the redox potential, measuring the dissolved calcium Ca 2+ , determining the degree of acidification and the number of germs in the paper machine circuit on the one hand and the degree of acidification and the type of acids in the pre-acidification on the other hand.
  • an acidification degree of 10% to a maximum of 30% is set at the paper machine and of 30% to 50% in the feed to the anaerobic reactor (pre-acidification) and more preferably of 35% to 45%.
  • the type and quantity of low molecular weight fatty acids are essential. For the anaerobic reactor to function, they are adjusted so that 30% to 70%, preferably 50%, of the fatty acids are present as acetic acid in the pre-acidification.
  • Acetoclastic, methanogenic microorganisms require acetic acid as a starting material for methane production. Since there are other types of microorganisms in the reactor in addition to methanogens, part of the conversion of other acids to acetic acid - in the broadest sense, acetogenesis - also takes place in the reactor. However, the reactor alone cannot handle the entire conversion process from glucose to acetic acid.
  • a portion of the organic material must therefore already be present in the form of volatile fatty acids, preferably acetic acid, when it enters the reactor. In terms of process technology, this is promoted by the presence of a pre-acidification tank. Depending on its size, however, a sufficient degree of acidification is often not achievable with almost or completely unacidified circulating water. An increase in free calcium due to acidification no longer occurs in the pre-acidification tank, since the wastewater at this point contains no or very little solid calcium carbonate.
  • a further and very important feature is the ratio of COD to dissolved calcium Ca 2+ .
  • the ratio is advantageously between 10:1 and a maximum of 5:1 and can be achieved with the present invention.
  • Such a numerical ratio of COD in mg O 2 /l to Ca 2+ in mg/l has proven to be particularly favorable in practice.
  • the additives and/or additive combinations are selected from an oxygen donor or redox modifier and/or one or more oxidative and/or non-oxidative biocides.
  • a chloramine, bromine-activated chloramines or DMH-stabilized halogens and combinations thereof, preferably monochloramine (MCA), are used as the oxidative biocide.
  • the oxygen donor or redox modifier is selected from hydrogen peroxide, sodium percarbonate and sodium, potassium, magnesium or calcium nitrate, preferably sodium chlorite.
  • a dispersant is additionally used within the scope of the present invention due to its known function and effect.
  • PCS process control system
  • a combination of additives therefore consists of an oxygen donor or redox modifier and an oxidative and/or non-oxidative biocide.
  • halogenamines such as monochloramine, bromine- or bromide-activated chloramine, but also all types of halogens stabilized with DMH (dimethylhydantoin) as well as a combination of chloramines and DMH-stabilized halogens.
  • nitrates e.g. Na, K, Mg or Ca nitrate
  • sodium chlorite can be used as oxygen donors or redox modifiers.
  • the oxygen donor or redox modifier is usually used continuously at one or more dosing points in the paper machine circuit.
  • the oxidative and/or non-oxidative biocide or the oxidative and/or non-oxidative biocides are usually added to the machine circuit in a shock manner. However, continuous dosing is possible in individual cases.
  • Slime control on the paper machine can be additionally supported by the use of a dispersant or online cleaning agent. This makes it even easier to adjust the dosage of the oxidative and/or non-oxidative biocide by adjusting the number, length and/or level of the dosing shocks so that the circulation parameters remain within the desired range and yet adequate circulation treatment is ensured.
  • the dispersant or online cleaning agent is usually dosed continuously. Shock dosing can also be used in individual cases.
  • the paper machine's white water I circuit is primarily suitable as a dosing point. However, dosing can also be carried out as part of the treatment of wet screens or felts, for example, since water drawn off from there is returned to the machine circuit.
  • Various measurement methods are suitable for controlling the desired effect, such as measuring the redox potential using electrodes, measuring the dissolved calcium using titrimetric tests, measuring the VFAs by titration, but preferably using HPLC or GC-MS. Ion-selective electrodes or hydrogen sensors can also be used.
  • the degree of COD degradation, the biogas production and the methane content in the biogas and the ash content and condition of the pellets can be evaluated.
  • Measurements of the number of germs or microbial activity can be carried out on the paper machine, for example via oxygen consumption or ATP measurement, as well as an assessment of the deposit situation during machine downtime.
  • Method for monitoring the effect of dosing a circuit conditioning additive combination consisting of a stabilized halogen-based biocide and an alkali metal chlorite by measuring the dissolved calcium in a process water stream, where in the example the process water is super clear filtrate.
  • a large paper machine producing testliner and fluting from 100% waste paper was treated with BAC (bromine- or bromide-activated chloramine), a stabilized halogen biocide made from sodium hypochlorite solution and ammonium bromide solution.
  • This biocide was shock dosed into the white water I (SWI) circuit.
  • White water II (SWII) of the same paper machine was cleaned via a fiber recovery system (disc filter), with one of the resulting process water streams being partially used to dissolve the raw material, while a large part was sent to the wastewater treatment plant and represented the main part of the paper machine's wastewater.
  • a portion of unfiltered white water II was also used to supplement the super-clear filtrate to dissolve the waste paper.
  • a small amount of SKF was collected from the SKF water stream directly after the disc filter, i.e. before the sodium chlorite solution was added, in a cooled collecting container using a small pump.
  • the cooling prevented further acidification (production of acids).
  • the concentration of dissolved calcium was measured in this water once a day.
  • Dissolved calcium was also determined several times a week by spot measurements in SWI and SWII.
  • the dosage amounts of sodium chlorite in the two "pulper water” streams were each adjusted so that the average concentration of dissolved calcium in the paper machine was 600 mg/l.
  • Automatic control Sodium chlorite for circuit conditioning as a component of the system according to the invention by automatically adjusting the dosage amount to the paper production (t/hour) and specific FW requirement (m 3 Fresh water per tonne of paper produced).
  • Process water was taken at a suitable point at the outlet of the disc filter of a paper machine that produces testliner and fluting from 100% recycled paper.
  • the water was left to stand for 2 hours, during which time the redox potential dropped to approximately -480 mV.
  • Four 1 liter bottles were each filled with 800 ml of the water and slowly stirred in a water bath using a magnetic stirrer.
  • Each beaker was fitted with a redox electrode connected to a ProMinent ® DMT.
  • the electrodes were positioned in such a way that the ingress of air into the bottles was minimised.
  • APINOX 24 (commercial product) was added to the bottles at levels of 100, 150, 200 and 400 ppm. The data logging system was started and the redox potential was recorded at 2-second intervals.
  • This method was used, among others, to pre-assess how much "conditioning" would be needed in a particular process water in a particular paper machine in order to optimize the degree of acidification and dissolved calcium in the process water.
  • the organic part of the dry matter can also be calculated from the ash content. The result is shown over time in diagram 6 (sheet 6/11).
  • the test was carried out with freshly taken SWI from a paper machine.
  • the stock on this machine contained approximately 12% solid calcium carbonate filler in suspended form.
  • the paper machine was treated with a stabilized oxidative biocide based on a mixture of sodium hypochlorite and a solution of 5,5-dimethylhydantoin (DMH), with the mixing ratio adjusted to produce a solution of dichlorodimethylhydantoin.
  • This mixture was dosed in shock doses 6 times a day for 30 minutes each, resulting in a break time of 210 minutes.
  • a 1 liter bottle was immediately filled to the brim with the shaken water and fitted with a magnetic stirrer. An oxygen electrode and a redox electrode were attached to the bottle and the lid was closed to exclude any air. The bottle was stirred in a water bath at 35°C, corresponding to the process temperature.
  • the output of the oxygen meter was connected to a data logger and the value was recorded every five seconds. A decrease in oxygen was observed and the recording stopped when it reached zero. The redox trend was recorded simultaneously.
  • Diagram 8 shows the oxygen consumption in SWI.
  • the diagram shows the amount of dissolved oxygen (mg/l) in the process water after adding a single dose of Dichlor-DMH and the active chlorine level, expressed as free chlorine in mg/l.
  • a paper machine producing approximately 900 t/d of testliner and fluting from 100% recycled paper was treated with monochloramine. In addition, a treatment with sodium chlorite was put into operation.
  • the total amount of volatile fatty acids did not change significantly at first, as one of the two biocide dosing points was taken out of service at the same time, thus reducing the total amount of biocide dosing.
  • the COD in the system increased slightly due to the circuit closure, so that the overall degree of acidification fell.
  • Lactic acid is a hydroxycarboxylic acid and sensu strictu not a volatile fatty acid. It cannot be directly metabolized by methanogens in the reactor. After the changeover, a shift to acetic acid occurred.
  • Diagram 9 shows the concentrations of volatile fatty acids in the SWI PMx as a whole and the change in the concentrations of volatile fatty acids towards acetic acid over time.
  • the level of free calcium ions was regularly measured on the paper machine described in Example 8. A concentration of 500 to 800 mg/l was defined as the desired range within the scope of the invention.
  • circuit conditioning with sodium chlorite and slime control with monochloramine are carried out.
  • a dispersant is dosed both onto the fabrics and into the circuit.
  • Chlorine levels and bacterial counts were regularly determined on both paper machines. Dissolved calcium is routinely measured on the paper machines, in the inflow to the sewage treatment plant and in the inflow to the anaerobic reactor: The paper mill employees measure the COD and the volatile fatty acids in the outlet of both paper machines, thus determining the degree of acidification. If necessary, the fatty acid spectrum is also checked using HPLC.
  • the sewage treatment plant staff regularly determines the ash content and thus the OTS of the anaerobic pellets as well as the degree of COD degradation in the reactors.
  • the dosage amounts of monochloramine and sodium chlorite were optimized so that the degree of acidification on the paper machine was approximately 15-20% and the dissolved calcium was approximately 400 to 500 mg/l.
  • sodium chlorite dosing was restarted to increase the efficiency of slime control and to keep the circulation parameters within the desired range.
  • Automation of the process is at least partially possible and makes it easier to control the process.

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  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Paper (AREA)
EP23199514.3A 2022-10-05 2023-09-25 Procédé d'optimisation de l'état de circuits de machines à papier avec réacteurs anaérobies en aval Pending EP4350073A1 (fr)

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DE102022125640.5A DE102022125640A1 (de) 2022-10-05 2022-10-05 Verfahren zur Zustandsoptimierung von Papiermaschinenkreisläufen mit nachgeschalteten Anaerobreaktoren

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EP4350073A1 true EP4350073A1 (fr) 2024-04-10

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151020A (en) 1961-05-10 1964-09-29 Nalco Chemical Co Slime-controlled industrial process water system and process
EP0517360A1 (fr) 1991-05-29 1992-12-09 Betz Europe, Inc. Prévention de contaminants adhésifs pour la fabrication du papier
EP0731776A1 (fr) 1993-11-30 1996-09-18 Stockhausen GmbH & Co. KG Emulsions huile dans eau utilisees a la place de microbicides (biocides) dans des systemes de conduites d'eau
EP1391430A1 (fr) 2002-08-22 2004-02-25 Hercules Incorporated Mélanges biocides synergétiques
WO2004031481A1 (fr) * 2002-10-07 2004-04-15 Alfred Pohlen Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
EP1568384A1 (fr) * 2004-02-18 2005-08-31 Sappi Austria Produktions-GmbH & Co. KG. Procédé de stabilisation des médias fluides germinatifs
DE102011101719A1 (de) 2011-05-16 2012-11-22 Bk Giulini Gmbh Verfahren zur bioziden Behandlung von industriellen Wassersystemen
WO2013145440A1 (fr) 2012-03-27 2013-10-03 栗田工業株式会社 Procédé de lutte contre la boue dans un processus de fabrication de pâte à papier
DE102013021893A1 (de) * 2013-12-23 2015-06-25 Bk Giulini Gmbh Verfahren zur Behandlung von industriellen Wasserkreisläufen
EP3398913A1 (fr) * 2017-05-05 2018-11-07 Hochschule für Angewandte Wissenschaften Hof Procédé et dispositif d'augmentation de puissance d'un procédé de dégradation anaérobie par élargissement ou adaptation de l'étape de pré-acidification
WO2020165007A1 (fr) * 2019-02-15 2020-08-20 Meri Environmental Solutions Gmbh Procédé de purification, à l'aide d'enzymes, d'eau de processus circulant dans une usine de traitement des déchets de papier
US20210032138A1 (en) * 2019-08-01 2021-02-04 Guangxi University Whey preacid treatment of wastewater with high calcium concentration to promote anaerobic digestion and delay calcification
EP3492653B1 (fr) 2017-11-30 2022-01-12 Alfred Pohlen Nettoyant en ligne pour installation d'acheminement d'eau ou en contact avec de l'eau

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151020A (en) 1961-05-10 1964-09-29 Nalco Chemical Co Slime-controlled industrial process water system and process
EP0517360A1 (fr) 1991-05-29 1992-12-09 Betz Europe, Inc. Prévention de contaminants adhésifs pour la fabrication du papier
EP0731776A1 (fr) 1993-11-30 1996-09-18 Stockhausen GmbH & Co. KG Emulsions huile dans eau utilisees a la place de microbicides (biocides) dans des systemes de conduites d'eau
EP1391430A1 (fr) 2002-08-22 2004-02-25 Hercules Incorporated Mélanges biocides synergétiques
EP1556547B1 (fr) 2002-10-07 2010-05-12 Alfred Pohlen Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
WO2004031481A1 (fr) * 2002-10-07 2004-04-15 Alfred Pohlen Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
EP1568384A1 (fr) * 2004-02-18 2005-08-31 Sappi Austria Produktions-GmbH & Co. KG. Procédé de stabilisation des médias fluides germinatifs
DE102011101719A1 (de) 2011-05-16 2012-11-22 Bk Giulini Gmbh Verfahren zur bioziden Behandlung von industriellen Wassersystemen
WO2013145440A1 (fr) 2012-03-27 2013-10-03 栗田工業株式会社 Procédé de lutte contre la boue dans un processus de fabrication de pâte à papier
DE102013021893A1 (de) * 2013-12-23 2015-06-25 Bk Giulini Gmbh Verfahren zur Behandlung von industriellen Wasserkreisläufen
EP3087035B1 (fr) 2013-12-23 2017-11-15 Kurita Water Industries Ltd. Procédé de traitement biocide des circuits d'eau industriels
EP3398913A1 (fr) * 2017-05-05 2018-11-07 Hochschule für Angewandte Wissenschaften Hof Procédé et dispositif d'augmentation de puissance d'un procédé de dégradation anaérobie par élargissement ou adaptation de l'étape de pré-acidification
EP3492653B1 (fr) 2017-11-30 2022-01-12 Alfred Pohlen Nettoyant en ligne pour installation d'acheminement d'eau ou en contact avec de l'eau
WO2020165007A1 (fr) * 2019-02-15 2020-08-20 Meri Environmental Solutions Gmbh Procédé de purification, à l'aide d'enzymes, d'eau de processus circulant dans une usine de traitement des déchets de papier
US20210032138A1 (en) * 2019-08-01 2021-02-04 Guangxi University Whey preacid treatment of wastewater with high calcium concentration to promote anaerobic digestion and delay calcification

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