WO2009040166A1 - Traitement d'une suspension aqueuse de particules solides - Google Patents

Traitement d'une suspension aqueuse de particules solides Download PDF

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Publication number
WO2009040166A1
WO2009040166A1 PCT/EP2008/059925 EP2008059925W WO2009040166A1 WO 2009040166 A1 WO2009040166 A1 WO 2009040166A1 EP 2008059925 W EP2008059925 W EP 2008059925W WO 2009040166 A1 WO2009040166 A1 WO 2009040166A1
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WO
WIPO (PCT)
Prior art keywords
coagulant
aqueous
polymeric flocculant
flocculant
water
Prior art date
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Ceased
Application number
PCT/EP2008/059925
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English (en)
Inventor
Stephen Adkins
Simon Oldfield
Alban Timmons
John Thompson
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BASF Schweiz AG
BASF SE
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Ciba Holding AG
BASF SE
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Publication of WO2009040166A1 publication Critical patent/WO2009040166A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • 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
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds

Definitions

  • the present invention relates to an improved flocculation process for the concentration or dewatering of aqueous suspensions of solids.
  • the process provides improved flocculant and coagulant performance.
  • High molecular weight polymeric flocculants are commonly used for this purpose.
  • High molecular weight flocculants may be cationic, anionic, nonionic or amphoteric in nature.
  • the choice of polymeric flocculant will largely depend upon the substrate, which is being treated. For instance it is common practice to use high molecular weight cationic flocculants to treat aqueous suspensions comprising suspended organic material, for instance sewage sludge. In paper- making it is known to use any of cationic, nonionic, anionic or amphoteric flocculants. Flocculation of mineral suspensions is frequently effected by use of anionic flocculants.
  • flocculant added to the suspension will often depend upon the substrate. Generally suspensions tend to be flocculated by high molecular weight polymers. Examples of this are described in WO-A-9314852 and
  • GB 2335656 describes a method for flocculating and precipitating impurities from a liquid by treating with a flocculating agent in the form of a metal salt and then subjecting the so treated liquid to a magnetic field with flat wave pulses at a sweep of frequencies. Square waves and triangular waves are proposed.
  • Japanese patent application 2002 307071 describes a process in which waste water is fed into a raw water tank followed by addition of a first inorganic flocculating agent which is passed to a tank in which a high molecular weight flocculating agent is added followed by passing into a coagulation sedimentation tank.
  • a magnetic apparatus preferably a permanent magnet, is positioned at any of the aforementioned stages.
  • WO-A-9703925 describes a method for treating wastewater by first addition of an anionic polymer and then passing the treated waste water through a magnetic field and wherein at least some of the contaminants flocculate. The flocculated contaminants are separated from the waste water.
  • US 4089779 and US 4110208 describe a classification method in which the precipitation of metal hydroxide is improved by adding ferromagnetic additive e.g. ferromagnetic lignosulfonate and then using a magnetic field to aid settling.
  • ferromagnetic additive e.g. ferromagnetic lignosulfonate
  • GB 1310321 describes dehydration of sludge by addition of flocculation aids.
  • the sludge is treated with high frequency electrical or magnetic field before addition of the flocculation aids.
  • Soviet Union patent 1694479 describes a method of thickening red mud by subjecting a farinaceous flocculant mixture with alkali aluminate solution to a continuous magnetic field. This is followed by adding the mixture to the pulp and subjecting the resulting mixture to a magnetic field.
  • Russian Union patent 1286533 describes the purification of wastewater by addition of aluminium containing coagulant followed by a dilute solution of polyacrylamide.
  • the flocculant is prepared using water that has been subjected to a magnetic field and then to electrolysis where it is saturated with anodically dissolved iron and again subjecting to a magnetic field.
  • An objective of the present invention is to improve the flocculation and/or coagulation efficiency in solid liquid separation processes.
  • a process of concentrating or dewatering an aqueous suspension of solid particles comprising the steps of, providing an aqueous polymeric flocculant composition or an aqueous polymeric coagulant composition by combining polymeric flocculant material or polymeric coagulant material with water, adding an effective flocculating or coagulating amount of the aqueous polymeric flocculant or coagulant composition into the aqueous suspension of solid particles thereby bringing about flocculation or coagulation of the solid particles, subjecting the so formed flocculated or coagulated suspension of solid particles to a concentrating or dewatering stage, wherein the aqueous polymeric flocculant or coagulant composition and/or the water which is to be combined with the polymeric flocculant or coagulant material is/are treated by a magnetic field and/or electric field with non- sinusoidal wave pulses at a sweep of frequencies.
  • the present invention also provides a novel process of preparing an aqueous polymeric flocculant composition or an aqueous polymeric coagulant composition comprising combining polymeric flocculant material or polymeric coagulant material with water, wherein the aqueous polymeric flocculant or coagulant composition and/or the water which is to be combined with the polymeric flocculant or coagulant material is/are treated by a magnetic field and/or electric field with non- sinusoidal wave pulses at a sweep of frequencies.
  • non-sinusoidal wave forms may include any of the wave forms in this category, for instance square waves, rectangular waves, ramp waves, triangle waves, spiked waves and sawtooth waves.
  • the non-sinusoidal waves are square waves.
  • the magnetic field and/or electric field is produced by a frequency modulated non-sinusoidal wave generator.
  • this non-sinusoidal wave generator will comprise at least one electrical coil.
  • the frequency modulated non-sinusoidal, preferably square, wave pulses have fundamental frequencies within the audio bandwidth. Nevertheless, due to the shape of the pulsed wave form energy will tend to be emitted in other bandwidths, including for instance within the magnetic, ultrasonic, radio and/or microwave bandwidths.
  • the water used to make the aqueous flocculant/coagulant composition may contain small amount of dissolved compounds.
  • such compounds may be those normally associated with hard water, for instance calcium salts, such as calcium carbonate or calcium bicarbonate.
  • Other compounds that may be present include other bicarbonates, carbonates, sulphates or chlorides etc.
  • Such compounds may be alkali metal salts, alkaline earth metal salts, aluminium salts, transition metal salts etc. Generally, these compounds will be present only been trace amounts.
  • the amount of dissolved compounds present in the water will be less than 1 % by weight of water and normally, it will be below 1000 ppm.
  • usage levels of calcium carbonate or calcium bicarbonate in hard water will be up to 600 ppm and more usually no higher than 300 ppm. Nevertheless, other circumstances it may be more desirable if the level of dissolved compounds, such as calcium carbonate, is below this, for instance below 100 ppm, especially below 50 ppm, particularly below 25 ppm or less.
  • the aqueous polymeric flocculant or coagulant composition is particularly suitable for providing improvements in the process of concentrating or dewatering suspensions of solids.
  • the non-sinusoidal wave pulse will include a sweep of frequencies and can be frequency modulated to between 300 and 21 ,000 Hz.
  • the spectrum of frequencies is often between 500 and 10,000 Hz and especially within the range between 700 and 3000 Hz.
  • the power output will be within the range of 5 milliamps and 5 amps.
  • the power output will be between 25 milliamps and 2 amps.
  • the magnetic field generated will tend to be relatively low and in the order of below 5 Gauss (5X10 "4 Tesla), and generally below 2 Gauss. Typically the magnetic field will be at least 0.1 Gauss often at least 0.5 and generally around 1 Gauss.
  • the treatment will generally be for a period of between 100 milliseconds to 3 hours or more. In all cases the treatment may be applied by passing the liquid/solution to be treated through the energy or magnetic field generated.
  • the treatment incorporates a complex field consisting of energy from the magnetic, audio, ultrasonic, radio and microwave bandwidths, generated by a Frequency Modulated Square-Wave Generator with pulses with extremely sharp rising edges, based on the apparatus covered by European patent EP0357102 and British patent GB 2335656.
  • a Frequency Modulated Square-Wave Generator with pulses with extremely sharp rising edges, based on the apparatus covered by European patent EP0357102 and British patent GB 2335656.
  • the energy is applied by at least one solenoid coil applied around a pipe or other conduit carrying the aforementioned fluid to be treated.
  • the vessel e.g. pipe or other conduit
  • the vessel desirably may have several coils and typically up to 40 or 50 coils. However, it is preferred that there are between 12 and 16 coils around the vessel. Desirably the aforementioned frequency modulated frequencies should be applied.
  • the aqueous polymeric flocculant or coagulant composition and/or the water which is to be combined with the polymeric flocculant or coagulant material may be passed along a pipe or other suitable flow line which is provided with a suitable means for treating the said composition or water by the frequency modulated energy field.
  • the aqueous polymeric flocculant or coagulant composition or the water which is to be combined with the flocculant/coagulant material may be held in a suitable vessel, such as a tank, and then treated with the frequency modulated energy field.
  • the treatment comprises passing the aqueous polymeric flocculant or coagulant composition or water which is to be combined with the flocculant/coagulant material through an electrical coil which generates a field by passing an energising signal to the coil.
  • the energising signal is frequency modulated as described above. This may conveniently be achieved by passing the aqueous flocculant/coagulant composition or water along a pipe around which an electrical coil is placed.
  • the field strength required to effect the treatment will depend on the diameter of the coil or the pipe around which the electrical coil is placed, the number of coils around the pipe, the energising signal and electrical power transmitted through the coil.
  • a greater electrical power is required where the diameter of the pipe or electrical coil is greater.
  • This additional treatment of the aqueous suspension may be carried out prior to, during or subsequent to the addition of the so treated flocculant or coagulant.
  • polymeric flocculant material or polymeric coagulant material we mean flocculant or coagulant products that comprise flocculant or coagulant polymers respectively. This may for instance be solid particulate powders or beads of flocculant or coagulant polymer, concentrated solutions of flocculant or coagulant polymer or alternatively reverse phase emulsions or dispersions of flocculant or coagulant polymer.
  • the polymeric flocculant material may comprise synthetic or natural polymer.
  • Suitable natural polymers include polysaccharides such as starches such as cationic, anionic, non-ionic or amphoteric starch, cellulose derivatives such as carboxy methyl cellulose and hydroxy ethyl cellulose, Guar gum, dextran, chitosan or chitin.
  • the polymeric flocculant is a synthetic polymer.
  • the polymeric flocculant may include high molecular weight polymers that are cationic, non- ionic, anionic or amphoteric.
  • the polymer is synthetic it should exhibit an intrinsic viscosity of at least 4 dl/g. More preferably though, the polymer will have significantly higher intrinsic viscosity.
  • the intrinsic viscosity may be as high as 25 or 30 dl/g or higher.
  • the intrinsic viscosity will be at least 7 and usually at least 10 or 12 dl/g and could be as high as 18 or 20 dl/g.
  • Intrinsic viscosity of polymers may be determined by preparing an aqueous solution of the polymer (0.5-1 % w/w) based on the active content of the polymer. 2 g of this 0.5-1 % polymer solution is diluted to 100 ml in a volumetric flask with 50 ml of 2M sodium chloride solution that is buffered to pH 7.0 (using 1.56 g sodium dihydrogen phosphate and 32.26 g disodium hydrogen phosphate per litre of deionised water) and the whole is diluted to the 100 ml mark with deionised water. The intrinsic viscosity of the polymers are measured using a Number 1 suspended level viscometer at 25 0 C in 1 M buffered salt solution.
  • polyethers such as polyalkylene oxides. Typically these are polymers with alkylene oxy repeating units in the polymer backbone. Particularly suitable polyalkylene oxides include polyethylene oxides and polypropylene oxides. Generally these polymers will have a molecular weight of at least 500,000 and often at least one million. The molecular weight of the polyethers may be as high as 15 million of 20 million or higher.
  • Another preferred class of synthetic polymers include polymers that are formed from an ethylenically unsaturated water-soluble monomer or blend of monomers.
  • the synthetic polymer may be cationic, non-ionic, amphoteric, or anionic.
  • the polymers may be formed from any suitable water-soluble monomers. Typically the water soluble monomers have a solubility in water of at least 5g/1 OOcc at 25°C.
  • Particularly preferred anionic polymers are formed from monomers selected from ethylenically unsaturated carboxylic acid and sulphonic acid monomers, preferably selected from (meth) acrylic acid, allyl sulphonic acid and 2-acrylamido-2-methyl propane sulphonic acid, and their salts, optionally in combination with non-ionic co-monomers, preferably selected from (meth) acrylamide, hydroxy alkyl esters of (meth) acrylic acid and N-vinyl pyrrolidone.
  • Especially preferred polymers include the homopolymer of sodium acrylate, the homopolymer of acrylamide and the copolymer of sodium acrylate with acrylamide.
  • Preferred non-ionic polymers are formed from ethylenically unsaturated monomers selected from (meth) acrylamide, hydroxy alkyl esters of (meth) acrylic acid and N-vinyl pyrrolidone.
  • Preferred cationic polymers are formed from ethylenically unsaturated monomers selected from dimethyl amino ethyl (meth) acrylate - methyl chloride, (DMAEA. MeCI) quat, diallyl dimethyl ammonium chloride (DADMAC), trimethyl amino propyl (meth) acrylamide chloride (ATPAC) optionally in combination with non-ionic co-monomers, preferably selected from (meth) acrylamide, hydroxy alkyl esters of (meth) acrylic acid and N-vinyl pyrrolidone.
  • DAEA. MeCI diallyl dimethyl ammonium chloride
  • ATPAC trimethyl amino propyl (meth) acrylamide chloride
  • non-ionic co-monomers preferably selected from (meth) acrylamide, hydroxy alkyl esters of (meth) acrylic acid and N-vinyl pyrrolidone.
  • the polymeric flocculant material comprises a synthetic polymer that is a cationic, non-ionic or anionic polymer of acrylamide.
  • the synthetic polymer may be in any convenient physical form. Preferably however, it will be in the form of a particulate solid material, such as beads or powder or alternatively it may be in the form of a reverse phase emulsion or dispersion.
  • the polymer may be formed by any suitable polymerisation process.
  • the polymers may be prepared for instance as gel polymers by solution polymerisation, water-in-oil suspension polymerisation or by water-in-oil emulsion polymerisation.
  • the initiators are generally introduced into the monomer solution.
  • a thermal initiator system may be included.
  • a thermal initiator would include any suitable initiator compound that releases radicals at an elevated temperature, for instance azo compounds, such as azo-bis- isobutyronitrile.
  • the temperature during polymerisation should rise to at least 70°C but preferably below 95°C.
  • polymerisation may be effected by irradiation (ultra violet light, microwave energy, heat etc.) optionally also using suitable radiation initiators.
  • Such polymer gels may be prepared by suitable polymerisation techniques as described above, for instance by irradiation.
  • the gels may be chopped to an appropriate size as required and then on application mixed with the material as partially hydrated water soluble polymer particles.
  • the polymers may be produced as beads by suspension polymerisation or as a water-in-oil emulsion or dispersion by water-in-oil emulsion polymerisation, for example according to a process defined by EP-A-150933, EP-A-102760 or EP- A-126528.
  • the synthetic polymer may be provided as a dispersion in an aqueous medium.
  • This may for instance be a dispersion of polymer particles of at least 20 microns in an aqueous medium containing an equilibrating agent as given in EP-A-170394.
  • This may for example also include aqueous dispersions of polymer particles prepared by the polymerisation of aqueous monomers in the presence of an aqueous medium containing dissolved low IV polymers such as poly diallyl dimethyl ammonium chloride and optionally other dissolved materials for instance electrolyte and/or multi-hydroxy compounds e. g. polyalkylene glycols, as given in WO-A-9831749 or WO-A-9831748.
  • the synthetic polymer is prepared as a water-soluble linear polymer.
  • a polymer it generally prepared in the absence of branching, structuring or cross linking agent. In some cases it may be desirable to introduce some degree of structuring such that the polymer is nevertheless water-soluble.
  • the synthetic polymer may be prepared with small or moderate levels of branching or cross linking agent so as to provide a branched or cross linked polymer.
  • Particularly suitable cross linked polymers will tend to have a volume average particles size diameter of below 10 microns and usually below 2 microns, usually has a reverse phase emulsion or dispersion, for instance as described in EP-A-202,780.
  • the polymeric flocculant material comprises a synthetic polymer in solid particulate form or as a reverse phase emulsion or dispersion, which synthetic polymer is formed from ethylenically unsaturated monomer or monomer blend.
  • the polymeric coagulant material will comprise a suitable coagulant polymer.
  • the coagulant polymer will be of a molecular weight below that of a flocculant polymer.
  • a coagulant polymer will exhibit an intrinsic viscosity of below 4 dl/g and usually below 3 dl/g, for instance below 2 dl/g.
  • the coagulant polymer may exhibit an intrinsic viscosity of at least 0.1 dl/g and usually at least 0.2 or 0.5 dl/g.
  • Such polymers will tend to have molecular weights in the range of between 50,000 and 2 million, for instance 150,000 to 1.5 million.
  • the coagulant polymer will normally be ionic and usually will exhibit a high charges density, for instance at least 2 or 3 milliequivalents/g and in some cases as high as 4 or 5 milliequivalents/g or higher.
  • the coagulant polymer may be anionic and for instance be formed from any of the aforementioned monomer or monomer blends for producing anionic polymers, suitably an anionic monomer or blend of anionic monomer(s) optionally with non-ionic monomer.
  • the coagulant polymer is cationic.
  • Such a cationic water soluble polymer may be a relatively low molecular weight polymer of relatively high cationicity.
  • the polymer may be a homopolymer of any suitable ethylenically unsaturated cationic monomer polymerised to provide a polymer with an intrinsic viscosity as mentioned above in regard to coagulant polymers.
  • the cationic coagulant may be prepared from any of the aforementioned monomer are all monomer blends for producing cationic polymers, typically employing at least one cationic monomer optionally with a non-ionic monomer. Homopolymers of diallyl dimethyl ammonium chloride are preferred.
  • the low molecular weight high cationicity polymer may be an addition polymer formed by condensation of amines with other suitable di- or tri- functional species.
  • the polymer may be formed by reacting one or more amines selected from dimethyl amine, trimethyl amine and ethylene diamine etc and epihalohydrin, epichlorohydrin being preferred.
  • the polymeric flocculant or coagulant material is combined with water to form an aqueous composition.
  • either the water or the aqueous composition is/are treated using the aforementioned energy and/or magnetic field.
  • the polymeric flocculant or coagulant material comprises water-soluble polymers
  • the polymer will dissolve in the water to form an aqueous solution as the aqueous polymer flocculant or coagulant composition.
  • the polymeric flocculant or coagulant material is an aqueous solution concentrate the combination with water will form a more dilute solution which will be the aqueous polymeric flocculant or aqueous composition.
  • aqueous dispersion which may be referred to as an aqueous dilution.
  • aqueous dilution Typically this will be in the case of reverse phase emulsion or dispersions of cross linked flocculant polymers as described in EP-A-202,780.
  • the aqueous dispersion (or aqueous dilution) would then be the aqueous flocculant or coagulant composition.
  • solid particulate polymer for instance in the form of powder or beads, is dispersed in water and allowed to dissolve with agitation. This may be achieved using conventional make up equipment.
  • the polymer solution can be prepared using the Auto Jet Wet (trademark) supplied by Ciba Specialty Chemicals.
  • the flocculant or coagulant material is supplied in the form of a reverse phase emulsion or dispersion this can then be inverted into water to form an aqueous solution or aqueous dispersion as the aqueous flocculant or coagulant composition.
  • the aqueous polymeric flocculant or coagulant composition has a polymer concentration of between 0.05% and 1 % by weight. This may for instance be between 0.1 and 0.5% by weight.
  • the aqueous flocculant or coagulant composition treated with the energy or magnetic field, either directly or by treating the water forming it, can then be fed to the aqueous suspension of solid particles.
  • the process according to the present invention is applicable generally to solids liquid separation processes.
  • the aqueous suspension of solids may comprise organic material including for instance sewage sludge or cellular material from fermentation processes.
  • the suspension may also be a suspension of cellulosic material, for instance sludges from papermaking processes.
  • the suspension is an aqueous suspension comprising mineral particles.
  • the process may involve the treatment of aqueous suspensions resulting from mined mineral processing and other mining wastes, for instance from carbon based industries such as coal and tar sands, comprising suspensions of mineral particles, especially clays.
  • the aqueous suspension of solids is derived from mineral or energy processing operations and/or tailings substrates.
  • energy processing operations we mean preferably processes in which the substrate involves the separation of materials useful as fuels.
  • the process may also involve suspensions selected from mining and refining operations the group consisting of bauxite, base metals, precious metals, iron, nickel, coal, mineral sands, oil sands, china clay, diamonds and uranium.
  • the suspensions will often contain at least 5% by weight suspended solids particles and may contain as much as 30% or higher. Preferably suspensions will contain at least 0.25% more preferably at least 0.5% Usually the suspensions will contain between 1 % and 20% by weight suspended solids.
  • the aqueous suspension to be treated in the process comprises at least some organic material.
  • This organic material may for instance be sewage sludges or other waste water derived substrates. It may also be cellular material, for instance from a fermentation process. Alternatively it may include cellulosic material, for instance as in paper or paperboard manufacturing or treatment of cellulosic wastes e.g. cellulosic sludges.
  • the suspended solids will comprise at least 10% by weight of organic material based on total weight of suspended solids. More preferably this will be at least 30% by weight, frequently at least 50% by weight, and especially at least 70% by weight and most preferably entirely organic derived material or at least at least 90% by weight.
  • Suitable doses of organic polymeric flocculant range from 5 grams to 10,000 grams per tonne of material solids. Generally the appropriate dose can vary according to the particular material and material solids content. Preferred doses are in the range 10 to 3,000 grams per tonne, especially between 10 and 1000 grams per tonne, while more preferred doses are in the range of from 60 to 200 or 400 grams per tonne.
  • Polymer A A liquid dispersion polymer ( 50% active in a mineral oil) of a 80:20 Methyl Chloride quaternised Dimethyl ammonium ethyl acrylate: acrylamide copolymer of IV 12.
  • a 0.125% active aqueous solution of Polymer A was prepared in deionised water and allowed to age for 1 hour. The sample was split into 2. The first solution was evaluated with no further treatment, the second solution was treated by passing through a tube (approx 7mm diameter) around which was wound the wire from a frequency modulation generator (model MOD -2 (D13519) supplied by Environmental Treatment Concepts Ltd, such that in formed 40 coils around the tube to create a solenoid. The power output applied was 12 volts peak-to-peak and the frequency range scanned was 700 to 3,000 Hz.
  • a frequency modulation generator model MOD -2 (D13519) supplied by Environmental Treatment Concepts Ltd, such that in formed 40 coils around the tube to create a solenoid.
  • the power output applied was 12 volts peak-to-peak and the frequency range scanned was 700 to 3,000 Hz.
  • Each solution was then evaluated as a flocculant for treating sewage sludge whereby 250 cm 3 of the sludge was taken in a 400 cm 3 beaker.
  • the appropriate volume of flocculant solution was added and the sludge was mechanically stirred for 15 seconds at a speed of 2000 rpm.
  • the flocculated sludge was then poured onto a sieve of 8cm diameter and the volume of filtrate produced after allowing 5 seconds drainage was measured.
  • a 0.125% active solution of polymer A was prepared in deionised water in a 600 cm 3 beaker (approx 10 cm diameter) and allowed to age for one hour by stirring at 800 rpm using a flat bladed mechanical stirrer.
  • a second 0.125% active solution of polymer A was prepared in a 600 cm 3 beaker wound round which were 15 coils of wire from the same generator as used in Example 1. The power applied and frequencies scanned were also the same as in Example 1. These were applied continuously for set periods of time. The solutions produced were tested on a sample of sewage sludge as described in Example 1 with the exception that the stirring speed applied was 4000 rpm.
  • Polymer B 50:50 sodium acrylate : acrylamide copolymer of IV approximately 24 made as a solid grade.
  • a 0.5% active aqueous solution of polymer B was prepared in deionised water and allowed to age for 2 hours. The solution was diluted to 0.05% active and split into two solutions. One solution was left untreated whilst the second solution was treated for 60 minutes as outlined in example 2.
  • the solutions were evaluated using 4% china clay slurry (containing 4g/l NaOH) as test substrate. 500 cm3 samples of the test substrate were taken in 500 cm3 cylinders. The appropriate volume of the solutions of polymer B were added and mixing was achieved using 3 plunger strokes. The resultant settlement rate was measured between two fixed points and the supernatant turbidity was measured after allowing 10 minutes settlement time.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Cette invention concerne un procédé de concentration ou de déshydratation d'une suspension aqueuse de particules solides comprenant les étapes consistant à fournir une composition aqueuse de floculant polymère ou une composition aqueuse de coagulant polymère en associant un matériau floculant polymère ou un matériau coagulant polymère avec de l'eau ; à ajouter une quantité efficace, en termes de floculation et de coagulation, de la composition aqueuse de floculant ou de coagulant polymère dans la suspension aqueuse de particules solides, ce qui provoque la floculation ou la coagulation des particules solides ; à soumettre la suspension floculée ou coagulée de particules solides ainsi formée à une étape de concentration ou de déshydratation, la composition aqueuse de floculant ou de coagulant polymère et/ou l'eau à associer au matériau floculant ou coagulant polymère étant traitée(s) par un champ magnétique et/ou un champ électrique avec impulsions d'ondes sinusoïdales à des fréquences de balayage. L'invention concerne aussi un procédé permettant de préparer une composition aqueuse de floculant ou de coagulant polymère.
PCT/EP2008/059925 2007-09-26 2008-07-29 Traitement d'une suspension aqueuse de particules solides Ceased WO2009040166A1 (fr)

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GBGB0718696.8A GB0718696D0 (en) 2007-09-26 2007-09-26 Treatment of an aqueous suspension of solid particles
GB0718696.8 2007-09-26

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US9068776B2 (en) 2009-10-30 2015-06-30 Suncor Energy Inc. Depositing and farming methods for drying oil sand mature fine tailings
US9404686B2 (en) 2009-09-15 2016-08-02 Suncor Energy Inc. Process for dying oil sand mature fine tailings
US9909070B2 (en) 2009-09-15 2018-03-06 Suncor Energy Inc. Process for flocculating and dewatering oil sand mature fine tailings
CN109081412A (zh) * 2018-09-10 2018-12-25 南京工业大学 一种聚合氯化铝镁混凝剂的制备方法及其应用
CN112744901A (zh) * 2019-10-31 2021-05-04 布莱恩·鲁迪·帕里西安 改变极性液体的性质的方法
CN112742320A (zh) * 2019-10-31 2021-05-04 布莱恩·鲁迪·帕里西安 改变极性液体的性质的方法和系统
CN119430842A (zh) * 2024-09-24 2025-02-14 中国铁道科学研究院集团有限公司铁道建筑研究所 一种湿法制砂石粉活性激发成岩剂及其在制备再生骨料中的应用

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US9909070B2 (en) 2009-09-15 2018-03-06 Suncor Energy Inc. Process for flocculating and dewatering oil sand mature fine tailings
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CN103864255A (zh) * 2014-02-10 2014-06-18 宁波市镇海捷登应用技术研究所 用电子扫频水处理设备处理河水的方法
CN109081412A (zh) * 2018-09-10 2018-12-25 南京工业大学 一种聚合氯化铝镁混凝剂的制备方法及其应用
CN109081412B (zh) * 2018-09-10 2021-10-22 南京工业大学 一种聚合氯化铝镁混凝剂的制备方法及其应用
CN112744901A (zh) * 2019-10-31 2021-05-04 布莱恩·鲁迪·帕里西安 改变极性液体的性质的方法
CN112742320A (zh) * 2019-10-31 2021-05-04 布莱恩·鲁迪·帕里西安 改变极性液体的性质的方法和系统
CN112742320B (zh) * 2019-10-31 2022-11-01 布莱恩·鲁迪·帕里西安 改变极性液体的性质的方法和系统
CN119430842A (zh) * 2024-09-24 2025-02-14 中国铁道科学研究院集团有限公司铁道建筑研究所 一种湿法制砂石粉活性激发成岩剂及其在制备再生骨料中的应用

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