Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F9/00—Multistage treatment of water, waste water or sewage
• • 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
  • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
• • 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
  • 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
• • 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
• • 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
• • 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

Definitions

• the invention relates to a method for minimizing the use of new water in the water cycle in a treatment plant.
• a control technology-based method for minimizing the use of water in a water cycle of a paper / pulp or wood factory is described in WO 99/01612.
• the concentration of contaminants is regulated either in the paper machine circuit and / or in a filtrate circuit, preferably in the last filtrate circuit, whereupon the discharge of the contaminants and also the fresh water supply are regulated.
• sensors are available at suitable points in the water circuit with which certain parameters, which are a measure of the concentration of contaminants, are to be recorded. In particular, this includes determining the turbidity and the cationic requirement.
• the invention provides a method for minimizing the use of new water in the water cycle in a treatment plant, in which
• a) cleaning and / or disintegration of the material to be processed is carried out in a treatment stage by means of water, the material to be processed being separated into different, not necessarily pure, components, at least one of which is withdrawn from the treatment stage;
• the suspension containing the remaining components is subjected to mechanical cleaning, in which solid particles, the dimensions of which exceed certain threshold values, are withdrawn from the suspension;
• the mechanically cleaned suspension is divided into a first process water stream and a second process water stream
• the biologically clarified clear water flow is introduced as fresh water flow into the first and / or into the second clear water flow, the ratio of the first process water flow to the second process water flow and the first clear water flow to the second clear water flow is determined in advance, depending on the material entered in the treatment stage and on the type of mechanical cleaning and on the type of chemical-physical clarification, and the water cycle is essentially closed is, fresh water is only supplied when the concentration of dissolved organic and inorganic substances exceeds a predetermined threshold.
• the invention takes advantage of the fact that the material to be treated has a previously known and sufficiently constant composition, so that certain contaminants and contaminants can be effectively removed from the water cycle without the need for constant fresh water supply.
• Wet separation then generally relates to lightweight packaging, that is to say plastics, aluminum, cardboard / film composites, paper composites and other composites which still have dirt and contaminants, if they have been treated in accordance with the process described in WO 98/18607, for example, that metallic substances and certain plastics no longer get wet separation.
• contaminants and contaminants can then be removed from the water cycle in an effective manner.
• the following steps are used individually or in combination in the mechanical cleaning after step b): b-1) sieving the suspension; a sieve with a mesh size of 2 to 6 mm, more preferably with a mesh size of 4 mm, is preferably used.
• the screening removes coarse organic dirt, such as plastic fragments.
• the suspension Passing the suspension through a hydrocyclone, the heavy portion being contained in the underflow and the other portion being contained in the overflow.
• the suspension would mainly still contain paper fibers, inorganic heavy dirt being removed from the hydrocyclone as the underflow.
• the overflow also contains the paper fibers and organic fine dirt.
• a filter with a pore size in the range of 150 ⁇ m being preferably used.
• the pore size is measured according to the size of the parts that are to be retained. The specified value effectively separates the paper fibers.
• the paper fiber remains on the filter and can be used later, for example to an old paper mill.
• step c-2 the following steps are carried out individually or in combination in the chemical-physical clarification according to step c-2):
• the biological clarification usually takes place in the municipal sewage treatment plant.
• water treatment is in the foreground, not the extraction of paper fibers.
• Figure 1 shows a water cycle in a processing plant for light packaging
• FIG. 2 shows schematically the details of the mechanical cleaning.
• the material to be processed which has its origin, for example, from the collection of the dual system in the yellow sack or in the yellow bin, has been pre-processed, whereby metallic and non-metallic materials have been at least partially separated out by appropriate sorting and separation processes .
• mainly lightweight packaging that is plastics, aluminum, cardboard-film composites, paper composites and other composites that are contaminated with food residues, sand, plastic chips, metal particles and the like are processed.
• LVP contaminated lightweight packagings
• the treatment stage 10 can consist, for example, of a pulper in which the paper fibers are dissolved by stirring. Heavy contaminants, such as stones, metals, will sink to the bottom of the pulp and can be taken off there as the residue R.
• a suspension S emerges from the treatment stage 10 and is subjected to a mechanical cleaning 20 in which all the suspended particles contained in the suspension are removed as far as possible. Details of the mechanical cleaning are explained below with reference to FIG. 2.
• the mechanically cleaned suspension is divided into two still cloudy process water flows P1 and P2.
• the first process water flow P1 is returned to the treatment stage 10, the second process water flow P2 is subjected to the chemical-physical clarification 30.
• the relationship between the first process water flow Pl and the second process water flow P2 is determined in advance. In structural terms, this is expressed in appropriately chosen Pipe diameters for the water pipe.
• an extensive solid / liquid separation takes place according to known measures, such as flocculation, whereby flocculated material and possibly sediment are drawn off.
• the chemically-physically clarified process water is then divided into two clear water streams Kl, K2.
• the first clear water stream K 1 can be reintroduced into the upstream process at various points, for example into the suspension S, but also, if the process requires, into the first process water stream P 1, as shown in FIG.
• FIG. 1 shows the introduction into the first process water flow Pl, which can take place directly or indirectly via the first sewage water flow Kl.
• FIG. 2 shows details of mechanical cleaning.
• the suspension S (FIG. 1) emerging from the treatment stage 10 is passed over a sieve 21 which has a relatively large hole diameter, for example 4 mm. Here plastic particles and other coarse dirt are separated out.
• the suspension which in the case described still contains the paper fibers and fine dirt, is introduced into a hydrocyclone 22, in which, as usual, heavy separation takes place in the lower reaches.
• the overflow also contains the paper fibers.
• heavy inorganic dirt such as sand, discarded.
• the paper fiber suspension is then brought further to a filter system 23, which consists, for example, of a multiplicity of circular filters which are connected in series, the pore size of these filters being of the order of 150 ⁇ m.
• the paper fibers are deposited on the filters and can be passed on to waste paper mills. Process water flows P1, P2 are led to treatment stage 10 or to chemical-physical clarification 30 (FIG. 1).

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Hydrology & Water Resources (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Microbiology (AREA)
• Analytical Chemistry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Paper (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Physical Water Treatments (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Biological Treatment Of Waste Water (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7925438

Family Applications (1)

Country Status (21)

Cited By (1)

Families Citing this family (2)

Family Cites Families (11)

• 1999
  • 1999-10-12 DE DE1999149265 patent/DE19949265C2/de not_active Expired - Fee Related
• 2000
  • 2000-09-26 EE EEP200200186A patent/EE200200186A/xx unknown
  • 2000-09-26 HU HU0301638A patent/HUP0301638A2/hu unknown
  • 2000-09-26 RU RU2002110109/15A patent/RU2002110109A/ru not_active Application Discontinuation
  • 2000-09-26 EP EP00969229A patent/EP1220963A1/de not_active Withdrawn
  • 2000-09-26 CN CN00814150A patent/CN1378611A/zh active Pending
  • 2000-09-26 PL PL00354313A patent/PL354313A1/xx not_active Application Discontinuation
  • 2000-09-26 WO PCT/DE2000/003363 patent/WO2001027383A1/de not_active Application Discontinuation
  • 2000-09-26 JP JP2001529507A patent/JP2003517916A/ja active Pending
  • 2000-09-26 SK SK487-2002A patent/SK4872002A3/sk unknown
  • 2000-09-26 AU AU79019/00A patent/AU7901900A/en not_active Abandoned
  • 2000-09-26 IL IL14895000A patent/IL148950A0/xx unknown
  • 2000-09-26 CA CA 2387140 patent/CA2387140A1/en not_active Abandoned
  • 2000-09-26 NZ NZ517960A patent/NZ517960A/en unknown
  • 2000-09-26 CZ CZ20021267A patent/CZ20021267A3/cs unknown
  • 2000-09-26 KR KR1020027004584A patent/KR20020047223A/ko not_active Application Discontinuation
  • 2000-09-26 US US10/089,286 patent/US6767463B1/en not_active Expired - Fee Related
  • 2000-09-26 BR BR0014692A patent/BR0014692A/pt not_active IP Right Cessation
  • 2000-10-06 AR ARP000105290 patent/AR025977A1/es not_active Application Discontinuation
• 2002
  • 2002-04-30 BG BG106668A patent/BG106668A/xx unknown
• 2003
  • 2003-01-10 HK HK03100268.2A patent/HK1049507A1/zh unknown

Non-Patent Citations (1)

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