WO2013016821A1 - Système et procédé de traitement des résidus de sables bitumineux - Google Patents

Système et procédé de traitement des résidus de sables bitumineux Download PDF

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Publication number
WO2013016821A1
WO2013016821A1 PCT/CA2012/050513 CA2012050513W WO2013016821A1 WO 2013016821 A1 WO2013016821 A1 WO 2013016821A1 CA 2012050513 W CA2012050513 W CA 2012050513W WO 2013016821 A1 WO2013016821 A1 WO 2013016821A1
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Prior art keywords
tailings
solids
treated
treating
oxyhydrogen
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PCT/CA2012/050513
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English (en)
Inventor
Hector Alvarez-Vazquez
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Xogen Technologies Inc.
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Application filed by Xogen Technologies Inc. filed Critical Xogen Technologies Inc.
Priority to CA2880227A priority Critical patent/CA2880227C/fr
Publication of WO2013016821A1 publication Critical patent/WO2013016821A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/04—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction
    • C10G1/045—Separation of insoluble materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0009—Settling tanks making use of electricity or magnetism

Definitions

  • the present disclosure relates generally to treatment of oil and gas tailings and in particular, oil sands tailings.
  • Extraction and refining of oil may result in tailings that include, for example, solid, dissolved or suspended pollutants.
  • the pollutants may be, for example, organic pollutants, such as hydrocarbon mixtures.
  • hydrocarbon mixtures include bitumen, naptha, organic compounds like naphthenic acids (NAs); phenols; benzene, ethylbenzene, toluene, xylenes (BETX); polycyclic aromatic hydrocarbons (PAHs); oil & grease; and inorganic compounds, for example CI " , S0 4 2 ⁇ , Al, As, Cr, Ca, Pb, Ni, Zn, and other metals.
  • NAs naphthenic acids
  • BETX benzene, ethylbenzene, toluene, xylenes
  • PAHs polycyclic aromatic hydrocarbons
  • oil & grease oil & grease
  • inorganic compounds for example CI " , S0 4 2 ⁇ , Al, As, Cr, Ca, Pb, Ni, Zn, and other metals.
  • Usual loads of organic and inorganic compounds confer to tailings alkalinity (600-800 mg CaC0 3 /L), hardness (90-120 mg CaC0 3 /L), TDS (1900-2300 mg/L), TSS ( ⁇ 7000 mg/L), NAs (50-120 mg/L), BOD (10-70 mg02/L), COD (-350 mg 0 2 /L), oil & grease (9-92 mg/L), Cu (0.002-0.9 mg/L), and Ni (0.006-2.8 mg/L).
  • amethod of treating tailings includes: pre-treating the tailings; electrolytically treating the pre-treated tailings; in the electrolytically treated tailings, separating solids from liquids; and filtering the separated liquids to result in a filtrand and a filtrate comprising the treated tailings.
  • the method may additionally include electrolytically treating the filtrate comprising the treated tailings, or the separated liquids.
  • Pre-treating the tailings may include: screening the tailings to remove substantially all particles greater than 1 mm; removing floating oils from the tailings to result in less than about 2 mg of floating oil per L of tailings; or both.
  • Electrolytically treating the pre-treated tailings may include: applying a continuously pulsed electrical signal to at least one of a pair of electrodes submersed in an aqueous liquid to generate bubbles of an oxyhydrogen-rich gas; and contacting the pre-treated tailings with the oxyhydrogen-rich gas bubbles.
  • the pulsed electrical signal may have a mark-space ratio of between approximately 1 :1 and 10:1 and a pulse frequency of approximately 10Hz-250 kHz.
  • the aqueous liquid may be the pre-treated tailings.
  • the method may further include: separating the oxyhydrogen-rich gas from the electrolytically treated tailings; and transporting the oxyhydrogen-rich gas to a secondary process.
  • the secondary process includes production of energy in a fuel cell or combustion device.
  • Separating solids from liquids in the electrolytically treated tailings may include: coagulating the solids, coalescing the solids, precipitating the solids, settling the solids, flocculating the solids, or any combination thereof; and separating the coagulated solids, the coalesced solids, precipitated solids, settled solids, or flocculated solids from the liquids.
  • a system for treating tailings there is provided a system for treating tailings.
  • the system includes: a pre-treatment system for pre-treating the tailings; an electrolytic treatment system for electrolytically treating the pre-treated tailings; a separation system for separating, in the electrolytically treated tailings, separating solids from liquids; and a filtering system for filtering the separated liquids to result in a filtrand and a filtrate comprising the treated tailings.
  • the system may further include: a recycling system to return the treated tailings filtrate or the separated liquids to the electrolytic treatment system.
  • the pre-treatment system may include: a screening system to remove substantially all particles greater than 1 mm from the tailings; a skimmer to remove floating oils from the tailings to result in less than about 2 mg of floating oil per L of tailings; or both.
  • the electrolytic treatment system may include: at least one pair of electrodes submersed in an aqueous liquid; and a source of a continuously pulsed electrical signal connected to least one of the electrodes to generate bubbles of an oxyhydrogen-rich gas.
  • the pulsed electrical signal may have a mark-space ratio of between approximately 1 :1 and 10:1 and a pulse frequency of approximately 10Hz-250 kHz.
  • the aqueous liquid may be the pre-treated tailings.
  • the system may further include: a separator for separating the oxyhydrogen-rich gas from the electrolytically treated tailings; and a transporter for transporting the oxyhydrogen-rich gas to a secondary system.
  • the secondary system may be a fuel cell or a combustion device.
  • the separation system may include: one or more systems for coagulating the solids, for coalescing the solids, for precipitating the solids, for settling the solids, for flocculating the solids, or for any combination thereof.
  • Fig. 1 is a schematic of a method for treating oil and gas tailings.
  • Fig. 2 is an illustration of the chemical oxygen demand (COD) concentration in a liquid as a function of the number of electrolytic treatments.
  • Fig. 3 is an illustration of reactions that may occur during electrolysis.
  • the present disclosure provides a method and system for electrochemically processing tailings using electrolysis to attempt to remove, destroy, or both remove and destroy, pollutants.
  • the tailings may be, for example, tailings from oil sands operations or tailings from other similar operations.
  • Embodiments herein are intended to allow pollutants to be removed, destroyed, or both removed and destroyed, at lower Hydraulic Retention Times than in conventional biological or physical-chemical systems.
  • the process may reduce the amount of residual bio-solids, thereby reducing additional treatment or disposal.
  • Off gas may be produced during treatment, and may be separated and purified.
  • the separated and purified off gas may be, for example: sold, used to produce energy in a fuel cell or combustion device, used to produce energy to be sold back to a utility company or another user of electricity, consumed in the process, or any combination thereof.
  • the tailings may comprise an influent tailing stream.
  • the tailings may comprise an intermediate waste or wastewater stream such as supernatant or biosolids, for example, in the context of a larger wastewater treatment system.
  • the tailings may include chemical processing effluent from an oil cracking process.
  • Tailings may be subjected to preliminary processing steps, such as oil skimming, screening, grit removal, or any combination thereof. Oil skimming, screening, and/or grit removal may be particularly important when tailings comprises raw wastewater influent from oil sands operations.
  • Pre-treated tailings may be pumped between a set of electrodes where highly oxidative species, for example ozone, hydrogen peroxide, hydroxyl radicals, or any combination thereof, are generated.
  • the set of electrodes may be used to generate the highly oxidative species separately from the pre-treated tailings and then subsequently mixed with at least a portion of the pre-treated tailings.
  • the mixture of oxidative species produced may be controlled by modulating the input signal.
  • the mixture of oxidative species may be selected in order to target specific pollutants.
  • Fig. 1 illustrates reactions that may occur during electrolysis.
  • Chemicals, for example phosphorous, and suspended solids may be coagulated, coalesced, precipitated, settled, flocculated, or any combination thereof.
  • the oxidative species may oxidize organic matter.
  • the method and system may reduce the amount of organics in the tailings, reduce toxicity, convert ammonia to nitrogen gas, reduce the level of pathogens in the tailings, or any combination thereof. A small fraction of the original solids in the raw tailings may remain after treatment and may be directly disposed.
  • the system may be designed as a continuous-flow, a batch-flow, or a recycling-flow system.
  • the tailings entering the system may be substantially free of floating oil, for example it is desirable for the tailings to have less than 2 mg of floating oil per L of tailings. It is desirable for the tailings entering the system to be substantially free of particles larger than about 1 mm in size.
  • the system and method may include a pretreatment to reduce the amount of floating oil, reduce the number of particles larger than about 1 mm in size, or both, before electrolytic treatment of the tailings.
  • the system may include one or more blowers to dilute and vent gas produced by the system, for example H 2 0 2 , to the atmosphere.
  • the system may include stainless steel components for gas exhaust, hydrogen gas sensors (for example located downstream from a gas-liquid separator), building fans, or any combination thereof in order to protect against any risk of hydrogen combustion. Because of the non-biological character of the solids, there is generally no need for digesters, therefore eliminating the production of CH 4 or mercaptans.
  • the system and method may include multiple electrolytic treatments, where each electrolytic treatment is followed by settling and removing the resulting solids. Further, each electrolytic treatment may include multiple passes, for example two passes, through the electrodes before settling and removing the resulting solids.
  • the method of treating tailings includes: pre-treating the tailings; electrolytically treating the pre-treated tailings; in the electrolytically treated tailings, separating solids from liquids; and filtering the separated liquids to result in a filtrand and a filtrate comprising the treated tailings.
  • the method may additionally include electrolytically treating the filtrate comprising the treated tailings, or the separated liquids.
  • Pre-treating the tailings may include: screening the tailings to remove substantially all particles greater than 1 mm; removing floating oils from the tailings to result in less than about 2 mg of floating oil per L of tailings; or both.
  • Electrolytically treating the pre-treated tailings may include: applying a continuously pulsed electrical signal to at least one of a pair of electrodes submersed in an aqueous liquid to generate bubbles of an oxyhydrogen-rich gas; and contacting the pre-treated tailings with the oxyhydrogen-rich gas bubbles.
  • the pair of electrodes may be spaced less than 5 mm apart.
  • the pulsed electrical signal may have a mark-space ratio of between approximately 1 :1 and 10:1 and a pulse frequency of approximately 10Hz-250 kHz.
  • the aqueous liquid may be the pre-treated tailings.
  • the method may further include: separating the oxyhydrogen-rich gas from the electrolytically treated tailings; and transporting the oxyhydrogen-rich gas to a secondary process.
  • the secondary process includes production of energy in a fuel cell or combustion device.
  • Separating solids from liquids in the electrolytically treated tailings may include: coagulating the solids, coalescing the solids, precipitating the solids, settling the solids, flocculating the solids, or any combination thereof; and separating the coagulated solids, the coalesced solids, precipitated solids, settled solids, or flocculated solids from the liquids.
  • the system for treating tailings includes: a pre-treatment system for pre-treating the tailings; an electrolytic treatment system for electrolytically treating the pre-treated tailings; a separation system for separating, in the electrolytically treated tailings, separating solids from liquids; and a filtering system for filtering the separated liquids to result in a filtrand and a filtrate comprising the treated tailings.
  • the system may further include: a recycling system to return the treated tailings filtrate or the separated liquids to the electrolytic treatment system.
  • the pre-treatment system may include: a screening system to remove substantially all particles greater than 1 mm from the tailings; a skimmer to remove floating oils from the tailings to result in less than about 2 mg of floating oil per L of tailings; or both.
  • the electrolytic treatment system may include: at least one pair of electrodes submersed in an aqueous liquid; and a source of a continuously pulsed electrical signal connected to least one of the electrodes to generate bubbles of an oxyhydrogen-rich gas.
  • the pair of electrodes may be spaced less than 5 mm apart.
  • the pulsed electrical signal may have a mark-space ratio of between approximately 1 :1 and 10:1 and a pulse frequency of approximately 10Hz-250 kHz.
  • the aqueous liquid may be the pre-treated tailings.
  • the system may further include: a separator for separating the oxyhydrogen-rich gas from the electrolytically treated tailings; and a transporter for transporting the oxyhydrogen-rich gas to a secondary system.
  • the secondary system may be a fuel cell or a combustion device.
  • the separation system may include: one or more systems for coagulating the solids, for coalescing the solids, for precipitating the solids, for settling the solids, for flocculating the solids, or for any combination thereof.
  • FIG. 2 One specific example of a method according to the present disclosure is illustrated in Fig. 2.
  • Tailings (10) from oil and gas production are screened and de-gritted (12) to generate screenings (14).
  • Oil (16) that floats is removed from the screened and de-gritted tailings at (18).
  • the de-oiled tailings are again screened, using a 1-2 mm fine screen (20), to generate fine screenings (22).
  • the resulting de-oiled and screened tailings are electrolytically treated (24).
  • the electrolytic treatment uses an oxyhydrogen gas generator and implements a water dissociation technology, as discussed in greater detail below, generating oxyhydrogen- rich gas (26).
  • Electrolytic treatment oxidizes organic matter present in the de-oiled and screened tailings.
  • the oxyhydrogen-rich gas (26) may optionally be separated and purified.
  • the separated and purified off gas may be used for a secondary use (28). For example, it may be sold, used to produce energy in a fuel cell or combustion device, used to produce energy to be sold back to a utility company or another user of electricity, consumed in the process, or any combination thereof.
  • the electrolytic treatment (24) coagulates, coalesces, precipitates and/or flocculates chemicals and suspended solids, which are separated (30) from the treated tailings to generate solids (32).
  • the solids (32) may be treated, for example by thermophilic aerobic digestion, to reduce the biological demand before disposal.
  • Thermophilic digestion of biological agents may be effected at, for example: a temperature of about 55 °C to about 60 °C for a period of about 10 days; or a temperature of about 50 for a period of about 5 days.
  • the thermophilic digestion may be effected at about 25 °C for about 4 to about 6 hours. This reduced time and temperature may be due to the electrolytic treatment reducing the biological demand of the tailings before the solids (32) are collected.
  • the effluent from the solids separation is filtered (34), using for example sand or granular activated carbon (GAC) to generate treated filtrate (36) and filtrand (38).
  • the filtrand (38) may be additionally treated (40), for example by being regenerated and reused, or disposed through environmentally safe and cost effective processes.
  • Regeneration may be achieved, for example, by incineration of the filtrand (38).
  • Disposal of the filtrand (38) may include, for example, washing and dewatering.
  • the screenings (14), fine screenings (12) and/or the solids (32) may also be treated (step(s) not shown) and disposed through environmentally safe and cost effective processes.
  • the additional treatment of the screenings (14), fine screenings (12) and/or the solids (32) may include washing and dewatering.
  • the screenings (14), fine screenings (12) and/or the solids (32) may be treated together.
  • the treated effluent (36) and/or the effluent from the solids separation may be electrolytically treated more than once.
  • the tailings may be electrolytically treated more than once.
  • electrolytically treated 2, 3, 4, 5, 6, 7, 8, 9, or more than 9 times by recycling the treated effluent and/or the effluent from the solids separation to the electrolytic treatment system, as illustrated in Fig. 2.
  • the method and system are intended and expected to remove in the range of 80 to 98% of the pollutants in the tailings.
  • the method and system are intended and expected to have a hydraulic retention time from 3 to 60 minutes.
  • the method and system are intended and expected to have power requirements around 0.5 to 40 kWh/m 3 .
  • the method and system may destabilize colloidal particles and increase the settling velocity of the resulting particles.
  • the electrolytically treated tailings may be settled in 5 to 20 minutes, resulting in a clear supernatant and settled solids.
  • the method and system can be controlled to generate a mixture of oxidative species suitably targeted to destabilize tailings having varying compositions.
  • the settled solids may include 50 to 70% v/v of the water from added tailings.
  • the settled solids may have water capillary suction times of less than 10 seconds and may be dewatered using, for example, sloped banks. Dried settled solids are typically easier to dewater and compact than solids produced by chemical or biological treatment. The quantity of water continuously released (i.e.
  • the system and method are designed to remove organic contaminants and reduce toxicity of the tailings input at the same time that fine tailings are being precipitated.
  • the tailings are expected to have a chemical oxygen demand (COD: an indirect measurement of the amount of organic compounds) in the range of 40,000 mg/L.
  • COD chemical oxygen demand
  • the COD is intended to be in the range of 200 mg/L.
  • filtering for example using granular activated carbon
  • the COD is intended to be in the range of 50 mg/L.
  • Table 1 provides a list of exemplary pollutants found in tailings from oil sands, and their resulting levels after electrolytic treatment.
  • BOD biological oxygen demand
  • BOD biological oxygen demand
  • Electrolysis may be performed using an oxyhydrogen gas generator and may implement a water dissociation technology, such as the kind disclosed in U.S. Pat. Nos. 6,419,815 and 6,126,794 of Chambers, both issued to Xogen Technologies Inc. and incorporated herein by reference (hereinafter "the Xogen patents").
  • gas generation apparatuses in accordance with embodiments include electrode "cells" each including two or more spaced-apart electrodes adapted to be immersed in a working fluid including water.
  • the working fluid comprises tailings or a tailings stream.
  • the electrodes are preferably made of the same material.
  • One electrode material is stainless steel for its low cost and durability, but it may be possible to use other conductive metals.
  • An equal spacing between the electrodes is maintained and it is preferable to minimize the spacing between the electrodes.
  • the spacing between the electrodes cannot be positioned excessively close because arcing between the electrodes would occur. It has been determined that a spacing of 1 mm or less is optimal spacing for producing oxyhydrogen-rich gas, but an increased spacing of up to approximately 5 mm may work effectively while being less subject to fouling due to accumulation of solids between the electrodes. A spacing above 5 mm may also be feasible, but tends to reduce the output of oxyhydrogen gas and increases power requirements.
  • Electrodes can be almost any shape, but preferably comprise flat plates closely spaced and parallel to each other.
  • Alternative embodiments may include coaxially aligned cylinders. Insulating spacers can be interposed between adjacent electrodes to maintain equal spacing between the electrodes and to prevent current leakage therebetween.
  • a high- frequency pulsed direct current (DC) electrical signal is applied to the electrodes.
  • the pulsed signal can be almost any waveform and have a variable current level, voltage level, frequency and mark-space ratio (i.e., a ratio of the duration of a single pulse to the interval between two successive pulses).
  • the source of power for the power supply may include a mains 1 10 volts or batteries, such as 12-volt car batteries.
  • the power supply may comprise two 12-volt batteries arranged in series to provide a 24-volt supply.
  • GG1 large-scale gas generator
  • a more complex power supply may be required for generating 24-volt pulsed DC signal having sufficient power to drive the large cells required.
  • multiple smaller electrode cells may be provided for redundancy and spaced apart in a reaction vessel or other reaction zone, in which case the cells may be driven by simpler independent power supplies.
  • a controller is used in conjunction with the batteries or other power source to generate one of a variety of pulsed output waveforms, such as a square wave, a saw tooth wave, or a triangular wave, which can be applied to the electrodes.
  • the pair of electrodes may be spaced less than 5 mm apart.
  • a pulsed signal has a mark-space ratio of between approximately 1 :1 and 10:1 and a pulse frequency of approximately 10Hz-250 kHz.
  • the electrodes After initiation of the pulsed signal from the power supply, the electrodes continuously and almost instantaneously generate bubbles of oxyhydrogen-rich gas from water molecules in an interaction zone that extends between the electrodes and slightly beyond the edges of the electrodes.
  • the generated bubbles are not bunched around or on the electrodes and thus readily float to the surface of the fluid in the reactor vessel or other reaction zone. Therefore, there is no need to add a chemical catalyst to assist the conduction of the solution or inhibit bubbles from bunching around or on the electrodes.
  • many different kinds of tailing streams can be used as the working fluid, as can other sources of water, such as surface water and ordinary tap water.
  • Oxyhydrogen gas generator GG3 may be submerged in tailings contained in a reaction vessel and operated for an interval of from approximately 60 seconds to up to approximately 10 minutes, then power to the gas generator GG3 may be shut off. In particular examples, the oxyhydrogen gas generator is operated for an interval between about 3 minutes and about 10 minutes. After an interval of operation of gas generator GG3, a substantial amount of solids may collect on the surface of the tailings. While a modest amount of solids may collect on the surface of the tailings during operation of gas generator GG3, a surprisingly large increase in floating solids occurs nearly immediately after de-energizing of gas generator GG3 and stopping of a recycle flow through the reaction vessel.
  • An extracted gas floatation unit process includes one or more cycles each including the following steps: (1) operating the gas generator GG3 (typically by applying a high-frequency pulsed electrical signal) for between approximately 60 seconds and approximately 10 minutes, (2) de-energizing gas generator GG3, (3) waiting until solids collect on the surface of the fluid (typically between approximately 30 seconds and 2 minutes), and (4) removing the solids from the surface (by skimming the surface, for example). The cycles can be repeated continually until a desired amount of solids has been removed from the tailings.
  • Oxyhydrogen gas generator may be mounted on a frame that is hung from a set of floats so that the submergence of the oxyhydrogen gas generator is maintained at a desired level below the surface of the fluid.
  • the oxyhydrogen gas generator may be mounted to a fixed lid or other fixed support for positioning at a fixed height in reaction vessel. Floats may also serve to seal the top of reaction vessel.
  • the frame may be adjustable so that the submergence level of the gas generator can be adjusted independent of the depth of fluid in the reaction vessel.
  • the oxyhydrogen gas generator may be placed on a pedestal or other support so that it is positioned below the middle of the depth of fluid in the reaction vessel. Placement of gas generator low in the reaction vessel (or other reaction zone) increases the distance that bubbles of oxyhydrogen-rich gas must rise through fluid, thus increasing their residence time and probability of contacting a solid particle or other treatable molecule.
  • the oxyhydrogen gas generator may be positioned at least slightly above the floor of the reaction vessel to avoid buildup of sediment and sludge between the electrodes of the gas generator.
  • the oxyhydrogen gas generator may include a series of closely-spaced electrode plates that are oriented generally vertically and arranged such that the spaces between adjacent plates are open to the reactor contents at both the top and bottom edges of the plates.
  • a pulsed electrical signal from a power source may be provided to the electrode plates via power transmission wires.
  • the application of the pulsed electrical signal may cause water molecules in the fluid suspension to be dissociated in an interaction zone extending between the plates and slightly beyond the openings between the plates, to thereby form an oxyhydrogen-rich gas including hydrogen and oxygen.
  • the oxyhydrogen-rich gas may collect in the interaction zone to form bubbles that rise through the fluid suspension between the plates and can then be collected at the surface of the fluid suspension under a gas containment lid. Because the aggregate density (specific gravity) of floes in the fluid suspension is only marginally greater than 1.0, the rising bubbles may transport the floes upward and into contact with the oxygen and hydrogen in the liberated gas bubbles and/or the atmosphere collected under the containment lid.
  • the recirculation loop may also provide a degree of positive mixing in the reaction vessel to help keep the solids in suspension and thus in a position to be transported upwards toward the surface of the fluid suspension or another contact zone where the solids are more likely to contact oxyhydrogen-rich gas.
  • Sample ports may be provided in the recirculation line to allow samples of the solids to be collected and analyzed for various parameters in order to determine the degree of treatment that has been achieved at any point in time.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Physical Water Treatments (AREA)

Abstract

La présente invention concerne un système et un procédé permettant de traiter des résidus. Le procédé consiste à : prétraiter les résidus ; traiter électrolytiquement les résidus prétraités ; dans les résidus électrolytiquement traités, séparer les solides des liquides ; et filtrer le liquide pour obtenir un gâteau et un filtrat comprenant les résidus traités. Le système comprend : un système de prétraitement pour prétraiter les résidus ; un système de traitement électrolytique pour traiter électrolytiquement les résidus prétraités ; un système de séparation pour séparer, dans les résidus traités électrolytiquement, les solides des liquides ; et un système de filtration pour filtrer le liquide pour obtenir un gâteau et un filtrat comprenant les résidus traités.
PCT/CA2012/050513 2011-07-29 2012-07-27 Système et procédé de traitement des résidus de sables bitumineux WO2013016821A1 (fr)

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US9550190B2 (en) 2011-11-08 2017-01-24 Exxonmobil Upstream Research Company Dewatering oil sand tailings
US9457295B2 (en) 2013-04-10 2016-10-04 Exxonmobil Upstream Research Company Systems and methods for separating mine tailings from water-absorbing polymers and regenerating the separated water-absorbing polymers
US11401181B1 (en) 2021-03-02 2022-08-02 Phosphorus Free Water Solutions, Llc Galvanic process for treating aqueous compositions
WO2024145372A1 (fr) * 2022-12-27 2024-07-04 Kemira Oyj Traitement de résidus à l'aide d'une combinaison synergique de floculant, de coagulant et d'"additif de traitement"
US12122691B1 (en) 2024-04-05 2024-10-22 Nuquatic, Llc Removal of fluoroalkyl compounds from water using galvanic cell

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