DE102009046797A1 - bleaching - Google Patents
bleaching Download PDFInfo
- Publication number
- DE102009046797A1 DE102009046797A1 DE200910046797 DE102009046797A DE102009046797A1 DE 102009046797 A1 DE102009046797 A1 DE 102009046797A1 DE 200910046797 DE200910046797 DE 200910046797 DE 102009046797 A DE102009046797 A DE 102009046797A DE 102009046797 A1 DE102009046797 A1 DE 102009046797A1
- Authority
- DE
- Germany
- Prior art keywords
- wastewater
- bleaching
- silicate
- water
- bleach
- 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.)
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Classifications
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- 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
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- 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
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Abstract
Die Erfindung betrifft ein Verfahren zum oxidativen Bleichen von verfärbtem Abwasser (1) mit einem Bleichmittel (2). Dabei soll der Aufwand für die eingesetzten Chemikalien dadurch vermindert werden, dass dem Abwasser (1) neben dem Bleichmittel (2) wasserlösliches Silikat (3) zugegeben wird.The invention relates to a method for oxidative bleaching of discolored wastewater (1) with a bleaching agent (2). The effort for the chemicals used should be reduced by adding water-soluble silicate (3) to the waste water (1) in addition to the bleaching agent (2).
Description
Die Erfindung betrifft ein Verfahren zum oxidativen Bleichen von verfärbtem Abwasser mit einem Bleichmittel.The invention relates to a process for the oxidative bleaching of discolored wastewater with a bleaching agent.
In der Papier- und Textilindustrie ist es üblich, unerwünschte Farbe aus den entsprechenden Rohstoffen mit Hilfe von Bleichmitteln zu entfernen. Dabei kommen als Bleichmittel Oxidations- und Reduktionsmittel oder adsorptiv wirkende Substanzen zum Einsatz. Diese Bleichmittel greifen die farbgebenden Substanzen an, indem sie die Chromophore zerstören.In the paper and textile industry, it is common to remove unwanted color from the corresponding raw materials with the aid of bleaching agents. In this case, the bleaching agents used are oxidizing and reducing agents or adsorptive substances. These bleaches attack the colorants by destroying the chromophores.
Beim Bleichen von Faserstoffen der Papierindustrie werden überwiegend neben Silikat und Wasserstoffperoxid noch Natronlauge beigemischt.When bleaching fibers of the paper industry, caustic soda is predominantly added in addition to silicate and hydrogen peroxide.
Das in der Papier und Textilindustrie anfallende Prozesswasser wird zunehmend in eine biologische Kläranlage geführt, dessen meist braun gefärbtes Klarwasser als Abwasser abgeführt wird.The process water generated in the paper and textile industry is increasingly fed into a biological treatment plant, whose mostly brown-colored clear water is discharged as wastewater.
Der Prozesskreislauf wird üblicherweise mit Frischwasser ergänzt, da das braune Wasser die Qualität des herzustellenden Produktes, insbesondere den Weißgrad einer Faserstoffbahn negativ beeinträchtigen kann.The process cycle is usually supplemented with fresh water, since the brown water can adversely affect the quality of the product to be produced, in particular the whiteness of a fibrous web.
Bekannt ist die Reinigung von Prozessabwässern mit Hilfe der Nassoxidation, welche im Temperaturbereich zwischen 120 und 140°C und unter ausschließlicher Zuführung von Wasserstoffperoxid erfolgt. Nachteilig sind dabei die Effizienz der Bleiche trotz Einsatz des relativ teuren Wasserstoffperoxids und der hohe Temperaturbereich.The purification of process wastewater with the aid of wet oxidation, which takes place in the temperature range between 120 and 140 ° C. and with the exclusive supply of hydrogen peroxide, is known. Disadvantages are the efficiency of bleaching despite the use of relatively expensive hydrogen peroxide and the high temperature range.
Die Aufgabe der Erfindung ist es daher, die Bleiche von verfärbtem Abwasser mit möglichst hoher Effizienz und geringem Aufwand zu ermöglichen.The object of the invention is therefore to enable the bleaching of discolored wastewater with the highest possible efficiency and little effort.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass dem Abwasser neben dem Bleichmittel vorzugsweise ausschließlich wasserlösliches Silikat zugegeben wird. Dabei stabilisiert und aktiviert das Silikat das Bleichmittel. Außerdem bindet das Silikat die im Abwasser vorhandenen Schwermetalle, welche ansonsten das Wasserstoffperoxid zerstören. Im Ergebnis werden die Effizienz sowie die erforderliche Zeit der Bleiche wesentlich verbessert.According to the invention the object has been achieved in that the wastewater in addition to the bleaching agent is preferably added only water-soluble silicate. The silicate stabilizes and activates the bleaching agent. In addition, the silicate binds the heavy metals present in the wastewater, which otherwise destroy the hydrogen peroxide. As a result, the efficiency and the required time of bleaching are significantly improved.
Hinzu kommt, dass auf den Einsatz von Natronlauge, wie beim Bleichen von Faserstoffen üblich, verzichtet werden kann, weil diese hier keinen wesentlichen Einfluss auf den Bleichvorgang hat. Da Natronlauge den pH-Wert deutlich erhöht, macht sich bei ihrem Einsatz oft eine Absäuerung notwendig. Folglich vermindert sich der Chemikalienbedarf durch die Erfindung erheblich.In addition, it is possible to dispense with the use of caustic soda, as is customary when bleaching fibrous materials, because this does not have a significant influence on the bleaching process. Since caustic soda significantly increases the pH, acidification often becomes necessary when used. Consequently, the demand for chemicals by the invention decreases considerably.
Um die volle Wirksamkeit des Bleichmittels zu gewährleisten, sollte das Silikat vorzugsweise vor oder gemeinsam mit dem Bleichmittel in das Abwasser geführt werden.In order to ensure the full effectiveness of the bleaching agent, the silicate should preferably be passed into the wastewater before or together with the bleaching agent.
Hierbei sollte das Silikat von Wasserglas, d. h. von wasserlöslichen Natrium- und/oder Kaliumsilikaten gebildet werden.In this case, the silicate of water glass, d. H. be formed of water-soluble sodium and / or potassium silicates.
Für die oxidative Bleiche können insbesondere Chlor, Ozon oder Wasserstoffperoxid als Bleichmittel verwendet werden, wobei Wasserstoffperoxid aus Kostengründen und zur Schonung der Umwelt den Vorzug hat.For the oxidative bleaching in particular chlorine, ozone or hydrogen peroxide can be used as a bleaching agent, with hydrogen peroxide for reasons of cost and to protect the environment has the advantage.
Hinsichtlich der erforderlichen Menge an Bleichmittel wurde festgestellt, dass ein Überschreiten bestimmter Werte sich kaum noch auf das Bleichergebnis auswirkt. Daher sollte das Flüssigkeitsvolumenverhältnis zwischen dem flüssigen Bleichmittel mit 100% Wirksubstanz und dem flüssigen Silikat mit einer Konzentration zwischen 36 und 38° Be' (Handelsware) im Bereich von 1,5:1 bis 5:1 liegen. Auch der Silikatmenge sind Grenzen gesetzt, da es den pH-Wert erhöht und eine Absäuerung nach Silikatzugabe vermieden werden soll.With regard to the required amount of bleach, it has been found that exceeding certain values has hardly any effect on the bleaching result. Therefore, the liquid volume ratio between the 100% active liquid bleach and the liquid silicate at a concentration between 36 and 38 ° Be '(commercial) should be in the range of 1.5: 1 to 5: 1. Also, the amount of silicate are limited, since it increases the pH and acidification should be avoided after addition of silica.
Insbesondere wenn Silikat und Bleichmittel in den optimierten Bereichen zugegeben werden, so kann der pH-Wert des Abwassers vor dem Bleichen zwischen 6,5 und 9,5 liegen.In particular, if silicate and bleach are added in the optimized regions, the pH of the effluent before bleaching may be between 6.5 and 9.5.
Durch den Einsatz des Silikats kann Abwasser in einem Bereich zwischen 40 und 140°C gebleicht werden, wobei der Bereich unter dem Siedepunkt des Abwassers aus energetischen Gründen und zur Minimierung des apparativen Aufbaus bevorzugt wird.By using the silicate, wastewater can be bleached in a range between 40 and 140 ° C, the range below the boiling point of the waste water for energy reasons and to minimize the apparatus design is preferred.
Die Effizienzsteigerung der Bleiche erlaubt es, die Dauer des Bleichvorgangs auf 5 bis 60 min zu begrenzen. Dabei kann der Bleichvorgang in einer Rohrleitung oder in einem Behälter stattfinden.The increase in bleach efficiency allows the duration of the bleaching process to be limited to 5 to 60 minutes. The bleaching process can take place in a pipeline or in a container.
Für die meisten Prozessabwässer genügt es, wenn die in das Abwasser gegebene Silikatmenge mit 36 bis 38° Be' zwischen 0,01 und 1 Vol% und die in das Abwasser gegebene Bleichmittelmenge (100% Wirksubstanz) zwischen 0,05 und 0,5 Vol% liegt.For most process effluents, it is sufficient if the amount of silicate in the wastewater at 36 to 38 ° Be 'between 0.01 and 1 vol% and the amount of bleach (100% active) in the wastewater between 0.05 and 0.5 vol % lies.
Um die Qualität des Abwassers zu verbessern, aber auch den Bleichvorgang nicht zu beeinträchtigen, sollte das Abwasser vor der Bleiche gereinigt werden. Hierzu sollte das Abwasser vor der Bleiche durch eine biologische Kläranlage geführt werden, in der vor allem Feststoffpartikel, der Kalkanteil sowie der CSB- und BSB-Wert gesenkt werden. Ergänzend kann es auch vorteilhaft sein, wenn das Abwasser vor der Bleiche und vorzugsweise nach einer biologischen Kläranlage und/oder nach der Bleiche in einen Absetzbehälter und/oder durch eine Ultrafiltrationsvorrichtung, insbesondere in Form eines Sandbettfilters geführt wird.In order to improve the quality of the wastewater, but also not to affect the bleaching process, the wastewater should be cleaned before bleaching. For this purpose, the wastewater should be passed through a biological sewage treatment plant before bleaching, in which especially solid particles, the lime content and the COD and BOD value are lowered. In addition, it may also be advantageous if the wastewater before bleaching and preferably after a biological treatment plant and / or after bleaching in a settling and / or by an ultrafiltration device, in particular in the form of a sand bed filter is performed.
Besonders eignet sich das Verfahren zur Entfärbung von verfärbtem Prozesswasser, insbesondere von Prozesswasser, welches bei der Herstellung und/oder Veredlung von Faserstoffen, Faserstoffbahnen oder Textilien anfällt, gebildet wird.The process is particularly suitable for decolorizing discolored process water, in particular process water, which is formed in the production and / or refinement of fibrous materials, fibrous webs or textiles.
Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigen die Figuren unterschiedliche Anlagenkonzepte.The invention will be explained in more detail below with reference to several exemplary embodiments. In the accompanying drawing, the figures show different system concepts.
Bei dem in
Da die Bleiche des Abwassers
Zur besseren Vermischung kann das Abwasser
Das eigentliche Entfärben des Abwassers
Hieran kann das gebleichte Abwasser
Im Unterschied hierzu gelangt das Abwasser
Danach erfolgt in gleicher Weise die Erwärmung des Abwassers
Durch die Zugabe des Silikats
Da Silikat
Bei dem hier betrachteten flüssigen Silikat
Claims (16)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910046797 DE102009046797A1 (en) | 2009-11-18 | 2009-11-18 | bleaching |
PCT/EP2010/065394 WO2011061018A1 (en) | 2009-11-18 | 2010-10-14 | Bleach |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910046797 DE102009046797A1 (en) | 2009-11-18 | 2009-11-18 | bleaching |
Publications (1)
Publication Number | Publication Date |
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DE102009046797A1 true DE102009046797A1 (en) | 2011-05-19 |
Family
ID=43402187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910046797 Withdrawn DE102009046797A1 (en) | 2009-11-18 | 2009-11-18 | bleaching |
Country Status (2)
Country | Link |
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DE (1) | DE102009046797A1 (en) |
WO (1) | WO2011061018A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2058232A1 (en) * | 1969-11-27 | 1971-06-09 | Pulp Paper Res Inst | Process for bleaching cellulosic fabric |
DE3620221A1 (en) * | 1985-06-20 | 1987-01-02 | Mo Och Domsjoe Ab | Process for treating peroxide-bleaching waste liquors |
DE3843992A1 (en) * | 1988-12-27 | 1990-07-05 | Woellner Werke | Alkaline liquid concentrates containing active oxygen compounds, and their use |
DE19925534A1 (en) * | 1999-06-04 | 2000-12-07 | Degussa | Treatment of waste waters containing (in)organic compounds involves the use of hydroxyl producers in the presence of titanium-containing silicates as catalyst |
DE10320618A1 (en) * | 2003-05-08 | 2004-11-18 | Papierfabrik Albbruck Gmbh & Co. Kg | Process for bleaching fibrous materials |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2219645B2 (en) * | 1972-04-21 | 1981-02-26 | Peroxid-Chemie Gmbh, 8023 Hoellriegelskreuth | Process for the elimination of toxins containing cyanide |
US5246598A (en) * | 1992-12-22 | 1993-09-21 | Degussa Corporation | Destruction of cyanide and other pollutants in aqueous solutions |
US5470480A (en) * | 1994-05-09 | 1995-11-28 | Eka Nobel, Inc. | Process for treating waste water effluent |
US5626717A (en) * | 1995-06-01 | 1997-05-06 | International Paper Company | Oxidative treatment of bleach plant effluent |
JP3555631B2 (en) * | 1995-06-19 | 2004-08-18 | 三菱瓦斯化学株式会社 | Wastewater treatment method |
DE19610345C1 (en) * | 1996-03-18 | 1997-11-20 | Krupp Vdm Gmbh | Catalysts used with peracid(s or hydrogen peroxide to remove dyes from textile effluent |
WO2009115376A1 (en) * | 2008-03-19 | 2009-09-24 | Unilever Plc | Waste water treatment with a mn ( iii ) or mn ( iv) complex as catalyst |
-
2009
- 2009-11-18 DE DE200910046797 patent/DE102009046797A1/en not_active Withdrawn
-
2010
- 2010-10-14 WO PCT/EP2010/065394 patent/WO2011061018A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2058232A1 (en) * | 1969-11-27 | 1971-06-09 | Pulp Paper Res Inst | Process for bleaching cellulosic fabric |
DE3620221A1 (en) * | 1985-06-20 | 1987-01-02 | Mo Och Domsjoe Ab | Process for treating peroxide-bleaching waste liquors |
DE3843992A1 (en) * | 1988-12-27 | 1990-07-05 | Woellner Werke | Alkaline liquid concentrates containing active oxygen compounds, and their use |
DE19925534A1 (en) * | 1999-06-04 | 2000-12-07 | Degussa | Treatment of waste waters containing (in)organic compounds involves the use of hydroxyl producers in the presence of titanium-containing silicates as catalyst |
DE10320618A1 (en) * | 2003-05-08 | 2004-11-18 | Papierfabrik Albbruck Gmbh & Co. Kg | Process for bleaching fibrous materials |
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Publication number | Publication date |
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WO2011061018A1 (en) | 2011-05-26 |
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Effective date: 20140603 |