DE3001312C2 - Process for processing the flotation foam that occurs during the processing of waste paper - Google Patents
Process for processing the flotation foam that occurs during the processing of waste paperInfo
- Publication number
- DE3001312C2 DE3001312C2 DE3001312A DE3001312A DE3001312C2 DE 3001312 C2 DE3001312 C2 DE 3001312C2 DE 3001312 A DE3001312 A DE 3001312A DE 3001312 A DE3001312 A DE 3001312A DE 3001312 C2 DE3001312 C2 DE 3001312C2
- Authority
- DE
- Germany
- Prior art keywords
- flotation
- processing
- foam
- flotation foam
- waste paper
- 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.)
- Expired
Links
- 238000005188 flotation Methods 0.000 title claims description 29
- 239000006260 foam Substances 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 13
- 239000010893 paper waste Substances 0.000 title claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000000344 soap Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000011734 sodium Substances 0.000 claims description 11
- 229910052708 sodium Inorganic materials 0.000 claims description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000006065 biodegradation reaction Methods 0.000 claims 1
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 7
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000000976 ink Substances 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002956 ash Substances 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 235000011010 calcium phosphates Nutrition 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 108010059892 Cellulase Proteins 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/022—Chemicals therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Treatment Of Sludge (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Aufbereitung des bei der Altpapieraufbereitung anfallenden Flotationsschaumes einer Flotationsanlage, der anschließend zu Flotationsschlamm eingedickt wird.The invention relates to a method for processing the flotation foam resulting from the processing of waste paper a flotation plant, which is then thickened into flotation sludge.
Die Flotation von Altpapier zur Druckfarbenentfernung wird im allgemeinen mit Hilfe von Chemikalien (Natronlauge, Natriumseife u. dgl.) nach entsprechender Auflösung des Papieres in einer Flotationsanlage durchgeführt. Die Natriumseife setzt sich dabei bekanntlich mit den Kalziumionen des Wassers zur unlöslichen Kalziumseife um. Diese Kalziumseife wirkt als Bindemittel und als Trägersubstanz für die Druckfarben in Verbindung mit Luftblasen und verläßt als Schaum die Flotationsanlage. Die auf diese Weise gereinigten Fasern werden zur weiteren Aufbereitung abgeführt. Der Floiationsschaum wird im allgemeinen zentrifugiert (siehe z.B. DE-PS 15 17 227), wobei die Feststoffe eingedickt werden und dann als Abfall, z. B. durch Verbrennen, vernichtet werden oder auf Abfalldeponien verbracht werden.The flotation of waste paper to remove printing ink is generally with the help of chemicals (caustic soda, sodium soap, etc.) after appropriate Dissolution of the paper carried out in a flotation plant. The sodium soap will sit down It is well known that the calcium ions in water turn into insoluble calcium soap. This calcium soap works as a binder and as a carrier substance for the printing inks in connection with air bubbles and leaves the flotation system as foam. The fibers cleaned in this way are used for further processing discharged. The floating foam is generally centrifuged (see e.g. DE-PS 15 17 227), whereby the Solids are thickened and then disposed of as waste, e.g. B. by burning, destroyed or in landfills be spent.
Der Schaum bzw. Schlamm besteht im wesentlichen aus Fasern, Asche, Druckfarbteilchen und Kalziumseifen. Somit sind im wesentlichen folgende chemischen Elemente vorhanden: Kohlenstoff, Wasserstoff, Sauerstoff, Aluminium, Silizium, Magnesium, Kalzium, Natrium. The foam or slurry consists essentially of fibers, ash, ink particles and calcium soaps. Thus, the following chemical elements are essentially present: carbon, hydrogen, oxygen, Aluminum, silicon, magnesium, calcium, sodium.
Dieser Schlamm, der — wie erwähnt — vernichtet wird, stellt einen entsprechenden Kostenfaktor bei der Altpapieraufbereitung und eine Umweltbelastung dar.This sludge, which - as mentioned - is destroyed, represents a corresponding cost factor in the Waste paper processing and an environmental impact.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Aufbereitung des bei der Altpapieraufbereitung anfallenden Flotationsschaumes bzw. des Flotationsschlammes zu schaffen, durch das dieser wieder verwertbar wird.The present invention is therefore based on the object of providing a method for processing the in the To create waste paper processing accumulating flotation foam or the flotation sludge, through the this becomes usable again.
Erfindungsgemäß wird diese Aufgabe durch die Anwendung des biologischen Abbauverfahrens unter Zugabe von Verbindungen der Elemente Phosphor und Stickstoff zum Flotationsschaum gelöst.According to the invention, this object is achieved through the use of the biological degradation process Dissolved addition of compounds of the elements phosphorus and nitrogen to the flotation foam.
Durch die erfindungsgemäße Zuführung von Stickstoff und Phosphor wird der Schlamm biologisch abbaubar. Auf diese Weise läßt sich erfindungsgemäß der Flotationsschaum bzw. der Flotationsschlamm nunmehr zur Kompostierung und damit zur Wiederverwertung verwenden. Auf Deponien kann er somit abbaubar gemacht werden.The addition of nitrogen and phosphorus according to the invention makes the sludge biological degradable. In this way, according to the invention, the flotation foam or the flotation sludge can be removed now use for composting and thus for recycling. So he can go to landfills be made degradable.
Ein erfindungsgemäßes Verfahren besteht darin, daß der Kalziumseife enthaltende Flotationsschaum mit einer Mischung aus Phosphor- und Salpetersäure angesäuert wird. Auf diese Weise bildet sich Kalziumphosphat Kalziumnitrat und Fettsäure.A method according to the invention is that the calcium soap containing flotation foam with acidified with a mixture of phosphoric and nitric acid. This is how calcium phosphate is formed Calcium nitrate and fatty acid.
ίο Dieses Verfahren läßt sich auf vorteilhafte Weise mit einem Verfahren zur Rückgewinnung von Fettsäure kombinieren, wie es in der deutschen Patentschrift 29 19 740 beschrieben istίο This procedure can be used in beneficial ways combine a process for the recovery of fatty acid, as described in the German patent 29 19 740 is described
Erfindungsgemäß kann dies dadurch erfolgen, daß derAccording to the invention, this can be done in that the
'5 mit Phosphor- und Salpetersäure angesäuerte Flotationsschaum mit Natronlauge zur Bildung von Natriumseife behandelt wird und der Schaum anschließend zentrifugiert wird, wobei das dabei anfallende Wasser zusammen mit Natriumseife wieder in den Aufberei- tungsprozeß zurückgeführt wird.'5 Flotation foam acidified with phosphoric and nitric acid is treated with sodium hydroxide solution to form sodium soap and the foam is then centrifuged, the resulting water being returned to the treatment process together with sodium soap.
Die sich durch die Säurebehandlung bildende Fettsäure ist in dem Schaum bzw. der Suspension fein verteilt bzw. emulgiert. Zusätzlich haftet sie noch zum Teil auf den Fasern und der Asche. Gibt man nun Natronlauge hinzu, so bildet sich die lösliche Natriumseife aus der Fettsäure, die anschließend zusammen mit Wasser in flüssiger Form während des Zentrifugierens abgeschieden wird. Durch diese Maßnahme wird eine erheoliche Einsparung von Seife bei der Altpapieraufbereitung erzielt.The fatty acid formed by the acid treatment is fine in the foam or suspension distributed or emulsified. In addition, it partially adheres to the fibers and the ashes. You give now Add sodium hydroxide solution, so the soluble sodium soap is formed from the fatty acid, which then together with Water is deposited in liquid form during centrifugation. This measure becomes a Erheoliche savings in soap achieved in the recycling of waste paper.
Der bei dem Zentrifugieren anfallende Schlamm, der Kalziumnitrat und Kalziumphosphat enthält, kann auf eine geeignete Deponie abgefahren werden und wird dort biologisch abgebaut.The sludge produced during centrifugation, which contains calcium nitrate and calcium phosphate, can be found on a suitable landfill will be driven off and will be biodegraded there.
Erfindungsgemäß kann ferner vorgesehen sein, daß der Flotationsschlamm mit den aus Sortierstufen bei der Papierherstellung anfallenden Abfallstoffen, wie z. B. Splitter, Rinde u. dgl., versetzt wird.According to the invention it can also be provided that the flotation sludge with the sorting stages in the Papermaking waste materials, such as B. splinters, bark and the like., Is added.
Diese Produkte dienen ebenfalls zum biologischen Abbau in Verbindung mit Stickstoff und Phosphor.These products are also used for biological degradation in connection with nitrogen and phosphorus.
Nachfolgend ist anhand der Zeichnung das Verfahren prinzipmäßig beschrieben.The principle of the process is described below with the aid of the drawing.
Nach der üblichen Aufbereitung von Altpapier (ζ. Β. in einem Stofflöser oder einem Bleichturm) wird die zuAfter the usual processing of waste paper (ζ. Β. In a pulper or a bleaching tower) the to
■'s deinkende Altpapiersuspension nach Reinigung und Entstippung über eine Leitung 1 in eine Serie von hintereinandergeschalteten Flotationszellen 2 eingebracht. Gleichzeitig (oder gegebenenfalls bereits vorher) werden Flotationschemikalien über eine Leitung 3■ 's deinking waste paper suspension after cleaning and Deflaking introduced into a series of flotation cells 2 connected in series via a line 1. At the same time (or possibly already beforehand), flotation chemicals are discharged via a line 3
so zugegeben. Die gereinigte Suspension verläßt die letzte Primärzelle über eine Leitung 4. Zur Nachreinigung des Flotationsschaumes dienen zwei Sekundärzellen 5. Der niedergeschlagene Flotationsschaum wird über eine Leitung 6 abgeführt. In diese Leitung 6 wird über eine Nebenleitung 7 eine Mischung aus Salpeter- und Phosphorsäure zugegeben.so admitted. The purified suspension leaves the last primary cell via a line 4. For post-purification of the Flotation foam are used by two secondary cells 5. The flotation foam that is precipitated is via one Line 6 discharged. In this line 6 a mixture of saltpeter and Phosphoric acid added.
Der so angesäuerte Flotationsschaum gelangt, zur besseren chemischen Reaktion, in einen Wärmetauscher 8, in den über eine Chemikalienleitung 9 NatronlaugeThe acidified flotation foam gets into a heat exchanger for a better chemical reaction 8, in which 9 caustic soda via a chemical line
zugegeben wird. Auf diese Weise bildet sich Natriumseife, Kalziumnitrat und Kalziumphosphat. In einer Zentrifuge 10 wird Wasser und flüssige Natriumseife abgetrennt und über eine Rückleitung 11 an beliebiger Stelle in die Aufbereitungsanlage zurückgeführt. Über eine Auslaßleitung 12 wird der eingedickte Flotationsschlamm, der neben den üblichen Bestandteilen, wie Fasern, Asche, Druckfarbteilchen, u. dgl., nunmehr auch Stickstoff und Phosphor in lonenform enthält, abee-is admitted. This is how sodium soap, calcium nitrate, and calcium phosphate are formed. In a Centrifuge 10, water and liquid sodium soap is separated and via a return line 11 to any Place returned to the processing plant. Via an outlet line 12, the thickened flotation sludge, which in addition to the usual components, such as Fibers, ash, printing ink particles, etc., now also contains nitrogen and phosphorus in ionic form, abee-
führt Dieser Schlamm kann nun auf eine Deponie gebracht werden, wo er biologisch abbaubar ist.This sludge can now be taken to a landfill where it is biodegradable.
Selbstverständlich kann das erfindungsgemäße Verfahren auch ohne die Rückgewinnung von Natriumseife durchgeführt werden. In diesem Falle ist es lediglich erforderlich. Stickstoff und Phosphor in lonenform entweder vor oder in die Zentrituge in den Schaum einzugeben, oder den Schlamm nach dem Zentrifugieren entsprechend mit Stickstoff und Phosphor zu mischen (strichliert angedeutet).Of course, the process according to the invention can also be used without the recovery of sodium soap be performed. In this case it is only necessary. Ionic nitrogen and phosphorus either before or in the centrifuge in the foam, or the sludge after centrifugation to be mixed accordingly with nitrogen and phosphorus (indicated by dashed lines).
Das Fasermaterial im Flotationsschlamm wird nun durch fermentativ gesteuerte Dissimulation abgebaut, d. h. das Enzym Cellulase, produziert von Bakterien und Pilzen, muß vorhanden sein. Dazu sind folgende Bedingungen einzunähen:The fiber material in the flotation sludge is now broken down by fermentation-controlled dissimulation, d. H. the enzyme cellulase, produced by bacteria and fungi, must be present. In addition, the following are Sewing conditions:
Bakterien und Pilze gedeihen nur im Bereich von pH 4,5—7 und bei Temperaturen zwischen 10 und 400C. Der von den Mikroorganismen gebundene Stickstoff und Phosphor wird für die Pflanzen nach dem Absterben der Mikroben assimilierbar. Das Kohlenstoff-Stickstoffverhältnis muß kleiner als 20 :1 sein, um unerwünschte Stickstoff-Fixierung zu vermeiden. Der Gesamtstickstoff in bezug auf Trockensubstanz sollte ίο im Bereich von 0,02 bis 0,4% liegen.Bacteria and fungi only thrive in the pH range 4.5-7 and at temperatures between 10 and 40 ° C. The nitrogen and phosphorus bound by the microorganisms can be assimilated by the plants after the microbes have died. The carbon to nitrogen ratio must be less than 20: 1 may be to avoid undesirable to nitrogen fixation. The total nitrogen in relation to dry matter should be ίο in the range from 0.02 to 0.4%.
Der Phosphorgesamtgehalt bezogen auf Trockensubstanz sollte um 0,02—0,2% gerechnet als P2O5, betragen. Der pH-Bereich ist am günstigsten bei 6 bis 7, um die Phosphorverfügbarkeit zu erhalten.The total phosphorus content based on dry matter should be around 0.02-0.2% calculated as P 2 O 5 . The pH range is most favorable at 6 to 7 in order to maintain the availability of phosphorus.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3001312A DE3001312C2 (en) | 1980-01-16 | 1980-01-16 | Process for processing the flotation foam that occurs during the processing of waste paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3001312A DE3001312C2 (en) | 1980-01-16 | 1980-01-16 | Process for processing the flotation foam that occurs during the processing of waste paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3001312A1 DE3001312A1 (en) | 1981-07-30 |
| DE3001312C2 true DE3001312C2 (en) | 1982-02-18 |
Family
ID=6092121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3001312A Expired DE3001312C2 (en) | 1980-01-16 | 1980-01-16 | Process for processing the flotation foam that occurs during the processing of waste paper |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3001312C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537237A (en) * | 2015-12-25 | 2016-05-04 | 安徽继宏环保科技有限公司 | Sewage purification equipment of urban household garbage treatment system |
-
1980
- 1980-01-16 DE DE3001312A patent/DE3001312C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3001312A1 (en) | 1981-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8339 | Ceased/non-payment of the annual fee |