WO2013135959A2 - Procédé et système de traitement des flux liquides dans une usine de pâte à papier chimique - Google Patents

Procédé et système de traitement des flux liquides dans une usine de pâte à papier chimique Download PDF

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Publication number
WO2013135959A2
WO2013135959A2 PCT/FI2013/050273 FI2013050273W WO2013135959A2 WO 2013135959 A2 WO2013135959 A2 WO 2013135959A2 FI 2013050273 W FI2013050273 W FI 2013050273W WO 2013135959 A2 WO2013135959 A2 WO 2013135959A2
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WIPO (PCT)
Prior art keywords
waters
unit
bleaching
source
point
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PCT/FI2013/050273
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English (en)
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WO2013135959A3 (fr
Inventor
Matti Ristolainen
Katja Viitikko
Olli RIMPINEN
Tuija Vartia
Maria Jose AGUERREBERE
Virginia FERNANDEZ
Gáston CUBAS
Alvaro MORAGA
Milton LÓPEZ
Diego CAVALLO
Juan MAITIA
Sami Saarela
Joaquin QUINTEROS
Richard Alonso
David BROGGI
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Upm-Kymmene Corporation
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.)
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Publication date
Application filed by Upm-Kymmene Corporation filed Critical Upm-Kymmene Corporation
Priority to CN201380013968.1A priority Critical patent/CN104169492A/zh
Priority to RU2014136221A priority patent/RU2621662C2/ru
Priority to BR112014022417-0A priority patent/BR112014022417B1/pt
Publication of WO2013135959A2 publication Critical patent/WO2013135959A2/fr
Publication of WO2013135959A3 publication Critical patent/WO2013135959A3/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0014—Combination of various pulping processes with one or several recovery systems (cross-recovery)
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor

Definitions

  • the invention relates to a method and a system for treating liquid flows at a chemical pulp mill.
  • Effluents of chemical pulp mills are typically treated in waste water treatment plants in order to decrease the amount of compounds that are harmful for the environment.
  • the mills are often being built in areas and surroundings with very strict environmental regulations. For example, the amount of water used by a chemical pulp mill may be strongly restricted. Therefore, it is possible that due to water resources it is not possible to build a mill to a place that otherwise fulfills demands. In many areas, a cleaner environment is desired in such a way that the mills produce substances that are less detrimental to the environment. Therefore, nowadays, it is important to look for solutions for finding a more closed water circulation process.
  • the present invention discloses a method and a system for treating liquid flows at a chemical pulp mill. Aspects of the invention are characterized by what is stated in the independent claims 1 and 12. Various embodiments of the invention are disclosed in the dependent claims.
  • the system according to the present invention comprises
  • brown stock preparation unit comprising cooking, washing, screening and oxygen delignification stages for producing pulp
  • bleaching unit comprising bleaching stages to bleach the produced pulp
  • bleaching unit comprises Nash pump sealing waters and/or bleaching filtrates
  • chemical recovery unit which may comprise jet condenser cooling waters and/or vacuum pump sealing waters,
  • a recovery boiler which also generates boiler blow down water, and an evaporator, which generates condensates.
  • the system may comprise a pulp drying machine. However, it is also possible that the system does not comprise said pulp drying machine.
  • At least a portion of process waters is conveyed to be reused as process water at the pulp mill .
  • the method for treating liquid flows at a chemical pulp mill comprises conveying EOP bleaching filtrates from the bleaching unit to be reused as process water in at least one process stage at the pulp mill .
  • the use can be wood handling in the wood handling unit, oxygen delignifacion washing or dilution water in the brown stock preparation unit, or gravity table shower water in the waste water treatment plant.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying Nash pump sealing waters from the bleaching unit to be reused as process water in at least one process stage at the pulp mill.
  • the use can be oxygen delignifacion washing or dilution water in the brown stock preparation unit, drum displacement washer plates in the bleaching unit, washing step(s) or dilution water of the bleaching unit, drying machine shower waters in a pulp drying machine, or gravity table shower water in the waste water treatment plant.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying condensates from the evaporator to be reused as process water in at least one process stage at the pulp mill.
  • the use can be gravity table shower water in the waste water treatment plant.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying waters from a second clarifier of the waste water treatment plant to be reused as process water in at least one process stage at the pulp mill .
  • the use can be wood handling in the wood handling unit, oxygen delignificacion washing or dilution water in the brown stock preparation unit, or gravity table shower water in the waste water treatment plant.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying jet condenser cooling waters from the chemical recovery unit to be reused as process water in at least one process stage at the pulp mill.
  • the use can be gravity table shower water in the waste water treatment plant, or the mill water system.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying vacuum pump sealing waters from the chemical recovery unit to be reused as process water in at least one process stage at the pulp mill .
  • the use can be gravity table shower water in the waste water treatment plant, or the mill water system.
  • the method for treating liquid flows at a chemical pulp mill comprises conveying boiler blow down waters from the recovery boiler to be reused as process water in at least one process stage at the pulp mill.
  • the use can be weak liquor tank or white liquor condensate tank in the chemical recovery unit.
  • the waters from a second clarifier of the waste water treatment plant is preferably excluded from the above as it may not be as advantageous as the others.
  • At least one of the above mentioned waters is led to be used in log washing of the wood handling unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in chipping of the wood handling unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in chip screening of the wood handling unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in chip conveyer of the wood handling unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in oxygen delignification washing of the brown stock preparation unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in dilution water in the brown stock preparation unit.
  • At least one of the above mentioned waters is led to be used in Drum Displacement washer (DD-washer) plates of the bleaching unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in washing step(s) of the bleaching unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in dilution water of the bleaching unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in drying machine shower water of a pulp drying machine. Alternatively or in addition, at least one of the above mentioned waters is led to be used in gravity table shower water of the waste water treatment plant. Alternatively or in addition, at least one of the above mentioned waters is led to be used in weak liquor tank of the chemical recovery unit. Alternatively or in addition, at least one of the above mentioned waters is led to be used in white liquor condensate tank of the chemical recovery unit.
  • DD-washer Drum Displacement washer
  • the method advantageously comprises conveying at least a portion of the process waters coming from the Nash pump sealing waters to one, two or three of the following stages:
  • the method advantageously comprises conveying at least a portion of the process waters coming from the causticizing jet condenser cooling waters and/or boiler blow down waters to one or two of the following:
  • the waste water treatment plant for gravity table shower waters, and/or the chemical recovery.
  • the method advantageously comprises conveying at least a portion of boiler blow down waters to a white liquor condensate tank of the chemical recovery. This may increase liquor inventory and use more secondary condensate at post O2 washing.
  • the method advantageously comprises conveying at least a portion of jet condenser cooling waters and/or dregs filter vacuum pump waters to a washing step of a sludge treatment area.
  • the system for treating liquid flows at a chemical pulp mill comprises:
  • brown stock preparation unit comprising cooking (including a digester), washing, screening and oxygen delignification stages for producing pulp,
  • the system advantageously comprises a conveying apparatus for conveying at least a portion of the process waters coming from the evaporator to the wood handling unit, and/or to the brown stock preparation unit, and/or to the bleaching unit, and/or to a drying machine of the pulp, and/or to the chemical recovery unit.
  • the system advantageously comprises a conveying apparatus for conveying at least a portion of the process waters coming from a drying machine of the pulp to at least one bleaching stage of the bleaching unit.
  • the system advantageously comprises a conveying apparatus for conveying at least a portion of the process waters coming from the recovery boiler to at least one chemical recovery stage of the chemical recovery unit and/or to the pulp drying machine.
  • the system advantageously comprises a conveying apparatus for conveying at least a portion of the causticizing jet condenser cooling waters and/or boiler blow down waters to the wood handling unit, and/or to the brown stock preparation unit, and/or to the bleaching unit, and/or to a gravity table shower waters of the waste water treatment plant, and/or to the chemical recovery stage of the chemical recovery unit.
  • the system advantageously comprises a conveying apparatus for conveying at least a portion of the process waters coming from the bleaching unit as Nash pump sealing waters to the brown stock preparation unit, and/or to the bleaching unit, and/or to the chemical recovery unit.
  • the conveying apparatuses preferably comprise at least pipe(s) and pump(s).
  • At least a portion of the raw water needed at the pulp mill is replaced by a circulation of process waters.
  • a portion of the process waters is circulated between different process stages and/or within a process stage, most advantageously without any treatment in the waste water treatment plant. Therefore, thanks to the present invention, it is possible to significantly decrease the amount of the generated waste water.
  • the present invention can be implemented at a chemical pulp mill having a digestion process, at least one bleaching stage, chemical recovery and various reactors, vessels, pumps, mixers, filters etc. known per se.
  • Figs 1 to 2 show example embodiments in reduced schematic chart.
  • brown stock preparation comprising digester, brown stock washing, oxygen delignification and washing stages therein,
  • raw water treatment plant refers to fresh water treatment plant
  • waste water treatment plant refers to waste water treatment plant.
  • ECF refers to elemental chlorine free.
  • TCF refers to totally chlorine free.
  • NPE non-process elements. NPEs are inorganic substances originated from process devices, some also from wood, raw water and chemicals, which are not wanted to be processed.
  • Adt refers to air dry metric ton of 90% dry chemical pulp.
  • Sealing waters are waters used in vacuum pumps for sealing.
  • Jet condenser cooling waters are waters that are led in direct contact with the steam in jet condensers or waters that result from such direct contact with steam.
  • Gravity table is a device used for dewatering sludge through a permeable belt in wastewater treatment. Gravity table shower waters are used for washing the belt.
  • Drum displacement washer is a rotating drum where a pulp mat formed on the outer filter face of the drum from a pulp surry is washed to displace the liquid in the mat to the inside of the drum.
  • Boiler blow down waters are waters blown out of the boiler to avoid concentration of impurities during continuing evaporation of steam.
  • White liquor condensate tank of the chemical recovery unit is a tank in the white liquor plant containing the secondary condensate from the evaporator. Process water conveyed to this point can be used together with the condensate for washing operations in the causticizing plant.
  • Weak liquor tank is a weak white liquor tank in the white liquor plant. Secondary condensate from the evaporator is brought to this tank for dilution.
  • the term "effluent” refers to waste waters. Effluents are conveyed to the waste water treatment plant for purifying process. Effluents may comprise, for example, bleaching effluents and ash leaching purge. In addition, the effluents may contain wood handling effluents.
  • bleaching effluents refers to effluents from bleaching unit and washing steps therein.
  • Advantageously bleaching effluents contain bleaching filtrates. Most advantageously bleaching effluents consist of bleaching filtrates. The bleaching filtrates contain acidic and/or alkaline flows.
  • Advantageously bleaching effluents do not contain fibers.
  • EOP alkaline extraction stage in pulp bleaching using oxygen and peroxide as additional chemicals.
  • the general purpose of cooking in bleached chemical pulp production is to recover fibers from chips that are fed to the digester by using chemicals and heat to remove fiber binding lignin and, in addition, to remove wood extractives which can later cause foaming and precipitants in the process. Therefore, chemicals which dissolve as much lignin and as little cellulose as possible are typically used in the pulping process.
  • the process for manufacturing bleached chemical pulp comprises pulping, washing, screening, bleaching, and cleaning stages.
  • sulfate cooking also called as kraft cooking or pulping, which uses a mixture of sodium hydroxide (NaOH) and sodium sulfide (Na 2 S), is the most commonly used pulp production method.
  • the cooking process may be based on batch cooking or continuous cooking comprising a digester or several digesters.
  • Brown stock treatment after the cooking process preferably includes a washing process, an oxygen stage, and a screening followed by washing.
  • the last washing apparatus in the oxygen stage receives the purest washing liquid for facilitating the bleaching of the pulp, and the filtrate obtained from this last washing apparatus is used in accordance with counter-current washing principles as washing liquid and in dilutions.
  • the filtrate When the filtrate is recovered from the first brown stock washing apparatus, it may be forwarded either directly to a black liquor evaporation plant or it may be used in digester plant processes for dilution and displacement, after which it ends up in the black liquor flow. After the last washing stage, the pulp may be led to bleaching.
  • Bleaching steps are used to improve the brightness, cleanliness, and brightness stability of pulp. Residual lignin is a major contributing factor in color, so it usually has to be removed or brightened.
  • the aim of bleaching pulp is to continue delignification and, by using bleaching chemicals, to remove any lignin, known as residual lignin, that remains in the pulp after the cooking and oxygen stages, and which could not be broken down and dissolved in the cooking and oxygen stages without sacrificing pulp yield or fiber properties.
  • chromophorous compounds are removed and oxidized to colorless compounds.
  • an important part of bleaching is washing dissolved lignin out of the pulp on the washer following the bleaching stage. For bleaching purpose,
  • CIO2 chlorine dioxide
  • O2 oxygen
  • hypochlorite (H) and/or hydrogen peroxide (H 2 O 2 ) can be used to react with some functional groups.
  • the chemical pulp industry desires to maintain a technique in which pulp is bleached in at least one stage with chlorine-containing chemicals in such a way that chlorine dioxide is the main chemical of the bleaching process of the mill.
  • chlorine dioxide is the main chemical of the bleaching process of the mill.
  • at least chlorine dioxide (CIO 2 ) is used for the bleaching purpose.
  • Bleaching effluent is typically a significant source of both biological and chemical oxygen consumption. For example chlorine-containing inorganic compounds and organic chlorine compounds from the reactions of chlorine dioxide and/or chlorine may remain in the process. Bleaching separates various compounds of lignin from the fibers, which compounds remain in the effluent in form of organic molecules.
  • sulfuric acid may be used in bleaching stage(s) for pH regulation and as main chemical in the hydrolysis of hexenuronic acids.
  • Sodium hydroxide may also be used for pH regulation and lignin extraction in alkaline stages.
  • oxygen and/or peroxide may be used in bleaching.
  • they are such substances that their contribution in, for example, purification processes is not noticed.
  • hydrochloric acid is used for pH regulation, and/or sulfur dioxide and/or other reductants are used for elimination of chemical residuals from the bleaching, i.e. for elimination of unreacted bleaching chemicals.
  • the pulp mill has not only bleaching effluents but also process waters, such as cooling waters, sealing waters, reject flows, channel waters, washing waters of the plant, and rain waters, as well as wood processing water. Said process waters have typically not been in contact with the pulping process with the exception of wood processing water and some channel waters that originate from process overflows and are therefore in contact with the pulping process.
  • the emissions accumulated therein are mainly leakages and overflows, occasional emissions caused by apparatus breakages, washing waters of devices, textiles (wires and felts) or containers originating from continuous or batch washings, and leakages from the reject system.
  • brown stock treatment comprises at least one washing process.
  • the brown stock treatment comprises
  • the screening process may be located after digester blowing, in the middle of or after the washing process, or after oxygen delignification.
  • these process stages are followed by a bleaching process, preferably based on ECF technique, which comprises a pulp bleaching plant with one or more bleaching stages based on the use of chlorine dioxide in addition to other possible stages using other known bleaching chemicals.
  • the bleaching sequence comprises at least one alkaline stage, wherein preferably at least oxygen and/or peroxide is used. Ozone stage(s), acid stage(s), and chelate stage(s) for removing heavy metals can also be used.
  • a method according to the present invention comprises at least an alkaline cooking process for producing pulp, a bleaching plant advantageously using ECF bleaching in which chloride-containing effluents are formed, and an effluent purification plant (waste water treatment plant) for treating bleaching plant effluents and/or other effluents generated at the mill .
  • ECF bleaching can be used instead of the ECF bleaching.
  • Advantageously ECF bleaching is used, wherein said bleaching comprises both, acid and alkaline, stages.
  • ECF bleaching covers all such bleaching sequences which comprise at least one chlorine dioxide stage and which do not use elemental chlorine in any bleaching stage.
  • Modern ECF bleaching used for bleaching pulp typically consists of at least two, more advantageously of at least three bleaching stages comprising preferably at least three washing apparatuses. If chlorine dioxide is used in one bleaching stage, most typically the doses are between 5 and 15 kg act. Cl/adt pulp. The chlorine dioxide doses for softwood are typically between 25 and 35 kg/adt and for hardwood between 20 and 30 kg/adt. If a mill is to further decrease the amount of organic chlorine compounds, the aim of the mills is typically to treat them within the mill rather than to decrease the use of chlorine dioxide.
  • the pulp mill typically comprises a chemical recovery plant including an evaporation process typically with an in-series connected evaporation plant, a chemical recovery boiler, removal of chlorides from the process, and a chemical production plant for producing cooking chemicals.
  • At least partly closed cycle systems for manufacturing bleached chemical pulp apply processes where at least part of the water and other chemicals is recycled and reused, which minimizes waste disposal. Said systems are particularly intended to minimize aqueous effluent and, hence, to protect the environment from the impact of disposal of effluents without significantly jeopardizing the processing cost or the value of saleable products. Chlorine, potassium, calcium, manganese, silicon, aluminum, phosphorous, iron, and barium are some elements of concern in a bleached chemical pulp mill .
  • Advantageously at least one effluent treatment line of the waste water treatment plant is provided with biological treatment.
  • Biological treatment is efficient specifically when the proportion of detrimental organic substances is decreased, which mainly comprise lignin compounds separated in bleaching, hemicelluloses and components originating from extractives, which constitute a significant portion of effluent coming from the bleaching plant.
  • organic substances mainly comprise lignin compounds separated in bleaching, hemicelluloses and components originating from extractives, which constitute a significant portion of effluent coming from the bleaching plant.
  • wood-originating compounds and part of the compounds is chlorinated and part of them is low-molecular compounds of carbon and hydrogen.
  • microbes act so that they use as nutrition only the organic portion of effluent, all inorganic substances, at least inorganic elements remain in the effluent.
  • biologically treated water after separation of the solid and liquid fraction, e.g.
  • the purification stage may be e.g. chemical, whereby the purpose is to remove, for example, metals by precipitating, whereby also part of the organic substances is removed.
  • a filtration technique can be applied, such as ultrafiltration and/or a method based on membrane technique and/or osmosis.
  • ultrafiltration membranes for example ultrafiltration membranes, ion exchange, chemical precipitation, sedimentation, flotation, and/or filtration may be used for treating effluents.
  • FIG 1 shows an example of a pulp mill.
  • a pulp mill Typically at the pulp mill chips and white liquor are supplied to a digester for the cooking of the pulp. After the cooking the cooked pulp, so called brown stock, is fed to washing and oxygen stages. Typically, hot water is used for said washing stage(s).
  • Weak black liquor coming from the cooking is conveyed from the cooking to an evaporation stage, in which some water is removed from the weak black liquor and, therefore, strong black liquor is generated.
  • the water removed from the weak black liquor, i.e. condensates from the evaporation is preferably conveyed to the washing stages or the brown stock.
  • the strong black liquor generated in the evaporation stage is treated in order to obtain green liquor.
  • the green liquor is further treated in order to obtain white liquor that can be reused for the cooking.
  • the pulp is conveyed to the bleaching unit.
  • the bleaching unit typically comprises several bleaching stages for bleaching the pulp.
  • the bleaching unit typically generates acid and alkaline effluents while bleaching the pulp, which effluents are typically conveyed to the waste water treatment plant.
  • the bleached pulp is typically conveyed to a paper mill and/or to a pulp drying machine.
  • Figure 2 shows some examples of the process water circulations in reduced schematic chart. These can be implemented, for example, at the pulp mill according to Figure 1 .
  • the process waters is conveyed to wood handling 10.
  • the process water is preferably used for log washing.
  • the process water is preferably used for chipping.
  • the process water is preferably used for chip screening.
  • the process water is preferably used for a chip conveyer.
  • a portion of the effluent to be conveyed to the wood handling 10 comprises second clarifier filtrate of the waste water treatment plant.
  • the process waters is conveyed to brown stock preparation unit 20.
  • the process water is used for oxygen delignification washing and/or dilution liquids.
  • the process water is preferably used for washing liquid of the Drum Displacement (DD) washer plate.
  • DD Drum Displacement
  • the process water circulated to the brown stock preparation unit 20 preferably comprises the bleaching Nash pump sealing waters.
  • at least a portion of the process waters is circulated to at least one bleaching stage 30, and is preferably used for one, two or three of the following: - washing liquid of the DD-washer plates (Drum Displacement washer),
  • the process water circulated to at least one bleaching stage 30 and washing steps therein preferably comprises one, two, three, or four of the following:
  • the above-mentioned process water is preferably bleaching Nash pump sealing water.
  • the process waters is conveyed to a drying machine 80, and is preferably used as shower waters therein.
  • the process water circulated to the drying machine 80 preferably comprises one two, three or four of the following:
  • the above-mentioned process water is preferably bleaching Nash pump sealing water
  • the process waters is conveyed to a waste water treatment plant 50, wherein the process water is preferably used for the shower waters of the gravity table.
  • the process water used as gravity table shower waters of the waste water treatment plant preferably comprises one, two, three, or four of the following:
  • At least a portion of the process waters is circulated to the chemical recovery unit 60, and is preferably used in a weak liquor tank and/or a white liquor condensate tank therein.
  • the process water used in said chemical recovery 60 preferably comprises boiler blow down waters.
  • At least a portion of the process waters to be circulated at the chemical pulp mill comprises one, two, three, four or five of the following water sources:
  • the bleaching stage(s) 30, comprising preferably EOP bleaching filtrates and/or Nash pump sealing waters,
  • the drying machine comprising preferably white waters
  • the evaporator 40 comprising preferably condensates
  • the recovery boiler 70 comprising preferably boiler blow down waters
  • the chemical recovery comprising preferably jet condenser cooling waters and/or vacuum pump sealing waters.
  • At least a portion of the process waters is circulated within the bleaching stage(s) 30.
  • at least a portion of the process waters is circulated within the chemical recovery stage(s) 60.
  • the total amount of the generated effluents and the total amount of the needed raw water are decreased therein.
  • at least a portion of the process waters is circulated within waste water treatment stage(s). However, the latter may not be an as advantageous embodiment as the others. Due to the circulation of at least a portion of the process waters, the total amount of effluents to be purified in the wastewater treatment plant can be decreased. In addition, the total amount of needed raw water (also called fresh water) is typically decreased.
  • At least a part of water coming from the Nash pumps is used as wash water of the screen plate of a DD washer; thus, the total amount of the generated effluents and the amount of the needed raw water is decreased therein.
  • the filtration device is preferably used for the gravity table shower waters.
  • any other purifying device is not needed. Therefore, if said gravity table shower waters are not reused water, the process waters that are circulated according to the present invention do not typically need any purifying step before they are reused as process waters. Waters of different purity levels can also be combined so that they match the purity level required at the point of use
  • Tables 1 to 3 show some examples of wastewater reduction according to the present invention.
  • "Realized Wastewater [m 3 /t] reduction” is the situation in an example pulp mill having in the beginning an amount of wastewater of approximately 22.5 m 3 /t.
  • clarifier effluent can be utilized therein.
  • re-circulated water e.g. wastewater, EOP or

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Abstract

La présente invention concerne un procédé de traitement des flux liquides dans une usine de pâte à papier chimique. Le procédé comprend une étape consistant à acheminer au moins un flux d'eau prédéterminé jusqu'à au moins un endroit prédéterminé du système. L'invention concerne, en outre, un système de traitement de flux liquides.
PCT/FI2013/050273 2012-03-12 2013-03-12 Procédé et système de traitement des flux liquides dans une usine de pâte à papier chimique WO2013135959A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201380013968.1A CN104169492A (zh) 2012-03-12 2013-03-12 一种在化学纸浆厂处理液流的方法和系统
RU2014136221A RU2621662C2 (ru) 2012-03-12 2013-03-12 Способ и устройство для обработки жидких потоков на целлюлозном заводе
BR112014022417-0A BR112014022417B1 (pt) 2012-03-12 2013-03-12 Método e sistema para tratar fluxos de líquidos em uma fábrica de polpa química

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125265A FI129114B (en) 2012-03-12 2012-03-12 Method and device for treating liquid streams in a cellulose factory
FI20125265 2012-03-12

Publications (2)

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WO2013135959A2 true WO2013135959A2 (fr) 2013-09-19
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CN109423905A (zh) * 2017-08-30 2019-03-05 黑龙江如柏科技有限公司 一种无废液排放的纸浆生产线系统

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Publication number Publication date
UY34671A (es) 2013-10-31
RU2636560C2 (ru) 2017-11-23
WO2013135958A2 (fr) 2013-09-19
BR112014022417B1 (pt) 2021-06-29
BR112014022418B1 (pt) 2021-09-08
WO2013135958A3 (fr) 2013-11-14
BR112014022418A2 (fr) 2017-06-20
RU2014136218A (ru) 2016-04-27
RU2621662C2 (ru) 2017-06-06
RU2014136221A (ru) 2016-04-27
CN109811572A (zh) 2019-05-28
CN104160088A (zh) 2014-11-19
WO2013135959A3 (fr) 2014-03-20
CN104169492A (zh) 2014-11-26
BR112014022417A2 (pt) 2017-06-20
FI129114B (en) 2021-07-15

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