EP2812285A2 - Appareil pour l'utilisation de nanoparticules dans l'élimination de produits chimiques de solutions aqueuses suivie de la purification de l'eau - Google Patents

Appareil pour l'utilisation de nanoparticules dans l'élimination de produits chimiques de solutions aqueuses suivie de la purification de l'eau

Info

Publication number
EP2812285A2
EP2812285A2 EP13746112.5A EP13746112A EP2812285A2 EP 2812285 A2 EP2812285 A2 EP 2812285A2 EP 13746112 A EP13746112 A EP 13746112A EP 2812285 A2 EP2812285 A2 EP 2812285A2
Authority
EP
European Patent Office
Prior art keywords
particles
water
target chemicals
microfilter
aqueous solution
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.)
Withdrawn
Application number
EP13746112.5A
Other languages
German (de)
English (en)
Other versions
EP2812285A4 (fr
Inventor
William A. Farone
Shane L. PALMER
Miguel Rivera
Dwayne C. CHONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bluflow Technologies Inc
Original Assignee
Bluflow Technologies Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bluflow Technologies Inc filed Critical Bluflow Technologies Inc
Priority claimed from PCT/US2013/025650 external-priority patent/WO2013120112A2/fr
Publication of EP2812285A2 publication Critical patent/EP2812285A2/fr
Publication of EP2812285A4 publication Critical patent/EP2812285A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/08—Nanoparticles or nanotubes

Definitions

  • the present invention is directed to a water purification apparatus configured to use a wide variety of colloidal and nanoparticles to remove chemicals from water with subsequent purification of the water beyond the chemicals removed. More particularly, the apparatus collects the nanoparticles, or enables the nanoparticles to be easily collected, for recovery of the chemical such that the particles can be reused.
  • the apparatus can accommodate a wide range of reaction times, particle and chemical concentrations and can be automated such that the apparatus operates in a fed batch mode to continuously purify the source aqueous solution.
  • nanoparticles for the adsorption of chemicals has been proposed for many years. Although recently renamed “nanotechnology”, small particle chemistry has been known from the mid 19th century and in the 20th century these types of particle were included in the class of physical state covered by the discipline known as “colloid chemistry” or “colloid science”. By either name, a common difficulty has always been the manipulation of particles that are difficult to handle, difficult to see and collect, and potentially hazardous in their dry and dusty state. See, e.g., "Separation and purification techniques in
  • an exemplary embodiment of which comprises an apparatus that is configured to use a wide array of Attorney Docket No. 8003/0103PW01 nanoparticles as adsorbent or absorbents.
  • the apparatus allows for complete mixed contact with the aqueous solution being treated, allows for easy removal of the particles with no risk of the particles remaining in the purified water and provides for easy and continuous automated operation.
  • the apparatus is also designed such that any level of purification of the water can be achieved including dissolved solids that are not collected by the particles but are still undesirable for using the water after removal of the target chemicals.
  • Exemplary embodiments of the apparatus can use solid particles made of a uniform substance or coated particles including, for example, particles with magnetic cores that have recently been described in the conventional art. Although the same apparatus or other exemplary apparatus can also handle larger particles, an exemplary embodiment is configured for particles in the range of smallest useful particles around 0.2 micrometers.
  • Figure 1 is a schematic flow diagram illustrating an apparatus according to an exemplary embodiment of the invention.
  • Figure 2 is a schematic flow diagram illustrating an apparatus according to another exemplary embodiment of the invention.
  • Figure 3 is a schematic flow diagram illustrating an apparatus according to another exemplary embodiment of the invention.
  • Figure 1 illustrates an example of part of an exemplary embodiment of the apparatus that relates to handling the particles and removal of the chemical of interest.
  • Figures 2 and 3 illustrate examples of another part of an exemplary embodiment of the apparatus that uses the produced water from Figure 1 at the same required hydraulic flow to further purify the water for subsequent use.
  • the example embodiments in Figures 1-3 can be used in combination with each other or separately on their own.
  • the particles or absorbents are designed to remove a known amount of the chemical of interest.
  • the particles may be used several times before they are saturated and are removed to collect the chemical and either be reactivated or replaced with activated particles.
  • the aqueous solution that contains the chemical of interest is fed from Tank Tl through Pump PI to solenoids (or valves) SI and S5.
  • SI is opened (S4 is closed)
  • SI is closed
  • the aqueous solution flows into the treatment Tank T2.
  • SI is closed
  • SI is closed
  • the aqueous solution flows toward S6 where it can be used to back flush particles off Filter Fl to begin the next cycle of treatment. Since in the last cycle fresh water (water without the chemical of interest) will be used to flush the filters, S6 can be closed so that S7 can be opened and Pump P3 can be used to drive the particles back into T2.
  • the aqueous solution with the target chemical or chemicals is reacted with the adsorbent particles for a predetermined period of time.
  • the reactions time is based on the chemical kinetics of the adsorption process.
  • the kinetics can be based on one or more of the design of the adsorbent, the concentration of the target chemical (or chemicals), the concentration of the adsorbent, the temperature and the mass transfer coefficient based on the mixing of the particles and the solution.
  • a large advantage for this process occurs due to the fact that the mixing by circulation of the particles and the solution using Pump P2 with S4 open (S3 closed) confers a larger mass transfer (enhanced kinetics) over passing the solution through a bed of the same particles.
  • Typical reaction times range from 1-2 minutes up to 45-60 minutes.
  • the kinetics can be based on the desired reduction in the concentration of the target Attorney Docket No. 8003/0103PW01 chemicals in the aqueous solution.
  • the initial concentration will range from a few milligrams per liter (mg/L) up to several percent in the solution and the final concentrations will be in the micrograms per liter ⁇ g/L).
  • a contaminant in water may be 100 mg/L and it may be reduced to less than 5 ⁇ g/L to comply with water quality standards while a chemical produced by fermentation may be several percent in a solution and reduced to 10-50 mg/L during practical reaction times.
  • F can be a nanofilter or microfilter.
  • the filter materials can be fritted stainless steel or engineered plastic fiber.
  • the pore size depends on the particles sizes. In the case of most nanoparticles, the pore size will be 0.1-0.2 ⁇ typical of the size used for microbial filter sterilization.
  • the product in Tank T4 has been depleted of the target chemical or chemicals but there still may be other materials in the solution such as inorganic and organic ions comprising the total dissolved solids (TDS) of the solution that make the depleted solution unfit for higher value uses.
  • TDS total dissolved solids
  • the particles can be back flushed off the filter by using a small amount of clean water and collecting the particles in the bottom of Tank T2.
  • S7 is opened while S6 is closed. Pump P3 is used.
  • the final collection of particles can be augmented, for example, with "magnetic capture” in the case of adsorbent particles with a magnetic core.
  • a magnet or a series of electromagnets, can be activated. These will contain 60- 99% of the particles such that the back flushing of Fl is much easier.
  • the particles can be recovered into Tank T3 by opening S2. A small amount of clean water can be used to flush Tank T3. The particles may be reactivated through removal of the target chemical by solvent extraction into a very concentrated, easily purified solution. The particles can then be added back to Tank T2.
  • the Tank 5 can receive as one stream the input water from Tank T4 in the example illustrated in Figure 1.
  • Solenoid System 1 contains solenoids S8, S10, S12, S15, S17 and S19.
  • Solenoid System 2 contains solenoids S9, SI 1, S13, S14, S16 and S18. All solenoids of Solenoid System 1 are open when those of Solenoid System 2 are closed. All solenoids of Solenoid System 2 are open when those of Solenoid System 1 are closed.
  • T7 is an open tank with mixing of carbon dioxide from the air which at pH above 7.8, preferably at 8.3, is enough in the carbonate form to cause precipitation.
  • an optional filter F5 can be provided between Pump P4 into Reverse Osmosis Membranes F3 and an optional filter F6 can be provided between Pump P5 and Reverse Osmosis Membranes F4.
  • the water in T7 may contain solid precipitated calcium carbonate, the solids are collected by Filter F2 before the total reject is discharged.
  • the part of the apparatus diagrammed in Figure 1 was operated with a methyl orange solution at a concentration of 100 mg/L to remove the methyl orange.
  • Nanoparticles with a magnetic iron core and a silicate coating containing a positively charged ion when immersed in solution (3-(trimethoxysily)propyl-octadecyldimethyl-ammonium chloride) were used.
  • the nanoparticles were designed to be able to remove 112 mg/L of methyl orange using a 5 gram/L concentration of particles in 45 minutes. It was determined that a concentration of 1.8 grams/L would remove 100 mg/L in less than two hours.
  • Tank T2 was operated at a working volume of 10 Liters and 18 grams of particles were added. 10 liters of the methyl orange solution were sent to T2 and it was determined that the methyl orange was removed to non-detectable levels in 2 hours. The particles were collected for reuse. In this case, four (4) electromagnets were used to assist particle collection and they were able to collect 70% of the particles while Fl collected the remaining particles.
  • an apparatus according to the exemplary embodiments illustrated in Figures 2 and 3 was configured with the approximate flow rate through the system of 2 gallons per minute. Used water with a TDS of 800 mg/L was converted to water with 40 mg/L TDS with a reject of only 15% of the input water.
  • an exemplary treatment device was used to remove 1,4-dioxane and 1,1-dichlorethene from water extracted from an active site.
  • the test used 120 liters of water over 30 cycles of operation of the pilot equipment.
  • the dioxane and DCE were both removed to non-detectable limits ( ⁇ 2 ppb) from the samples of water analyzed after 10, 20 and 30 cycles.
  • the pilot unit can be scaled up and Attorney Docket No. 8003/0103PW01 automated for testing at the site at an average flow of one gallon per minute.
  • the exemplary laboratory pilot unit of the example treatment device has an approximately 5 gallon reactor and is set up corresponding to the attached diagram.
  • the contaminated water is pumped into the reactor where it contacts the particles.
  • the particles and water are circulated for a predetermined time to insure that the levels of the contaminants in the water fall below MCL.
  • the water is then separated from the particles by a
  • microporous filter and the particles returned to the reactor for the next aliquot of water to be treated.
  • a purpose of the tests using site water was to validate the laboratory findings about the kinetics and the cycle timing.
  • the test was begun by mixing 4 liters of the site water with 110 grams of the Ti- PCMA particles in the reactor. An extra 10% of particles was used to allow for some lack of total removal from the filter during subsequent filtration steps.
  • pump P2 was then turned on and the mixture allowed to circulate from the tank through the pump P2 and back into the tank for 10 minutes. At this time the valves were changed such that pump P2 pumped the mixture through the filter F 1.
  • the produced water was collected in T4 and the first sample (zero time) was taken for analysis.
  • the filter used in this exemplary test was a sintered stainless steel hollow tube filter with a surface are of 365 cm 2 (0.0365 m 2 ). The particles were collected on the outside of the filter between the filter surface and the housing. When the flow is reversed to push the particles back into the tank, the water flows through the center of the filter to the housing.
  • the present invention enables larger units to be built of various scales at, for example, 1 gpm, then 15 gpm, and then at any other larger size desired.
  • the present invention contemplates scaling the unit up to 1 gallon per minute (3.875 L/min) average flow. Assuming a 15 minute total time for a cycle and circulation of the reactor for 10 minutes, the present invention recognizes that a reasonable amount of time to fill and empty is 2 minutes. In an example, to average 1 gpm over the 15 minute period, the pumps must flow at 7.5 gpm (29 L/min) during the fill and empty cycles.
  • the present invention can be scaled up to a continuous 1 gallon per minute unit, and then further to a 15 gallon per minute unit, and then to any other desirable larger size unit. In this way, the exemplary embodiments of the present invention enable the scaling of larger units from this arrangement.
  • the present invention recognizes that, in an example pilot test, the scale-up on flow is approximately 100 times but the scale up on the number of particles is only 15.
  • the operating size of the reactor in this case can be 15 gallons compared to the approximate 1 gallon (4 liters in this test) in the pilot unit.
  • the filter was not limited in any way, and therefore, the present invention recognizes that a total filter surface of 10 times what was used in this example test should be adequate, which includes for example about 0.4 m 2 .
  • the implication for a full scale unit at 15 gpm would be that 4 m 2 of filter is a starting estimate.
  • the scale factor can be Attorney Docket No. 8003/0103PW01 somewhat reduced.
  • stainless steel filter is not the only choice.
  • Other filters and materials such as polymeric microfilters have been provided in the same size range and have been used successfully in RO systems when precipitated CaC03 was to be eliminated from streams under 120 psi pressure going to the membranes. The smallest of these filters was too large for the laboratory unit but, based on price, one or more alternative filters may be appropriate for the filters for larger units.
  • the next task is to select the other components and program the control system for the solenoids.
  • the present invention uses PC technology with typical control boards to allow easy modification, reduce cost and provide for simple interfacing to any desired monitoring of the test unit and ultimately the full size unit.
  • the source and produced water tanks are separate from the reactor unit.
  • the present invention made several assumptions in the example pilot tests. For example, the following are the current assumptions.
  • the reactor tank will be 25 gallons to allow plenty of headspace and the potential for testing slightly increased rates.
  • the system will be skid mounted on a doublewide skid.
  • the system will be protected with the minimum of a roof and electrical connections will be available. Since the pumps are expected to be diaphragm pumps operating by a small air compressor, the total AC power will be determined by the requirements of the control system plus the compressor (to be determined).
  • the exemplary embodiments of the present invention can include an apparatus, and method of using the apparatus, that removes target chemicals from water using particles down to 0.2 micrometers in size.
  • the apparatus can include (a) a source of an Attorney Docket No. 8003/0103PW01 aqueous solution of the target chemical that can be supplied on demand to a reaction chamber, (b) a reaction chamber with means for adding and removing a slurry of particles.
  • the reaction chamber also can include a device for recirculating the particles after mixing with the aqueous solution of the target chemical.
  • the apparatus further includes (c) a device or component for timing the reaction between the particles and the target chemical such that the concentration of the target chemical in the aqueous solution reaches a predetermined low level in a desired time, (d) a device or component for removing the aqueous phase from the reactor while keeping the particles entrained inside the reactor using a microfilter that can be back flushed, (e) a device or component adding more aqueous solution to the reactor from the source and continuing the cycles until the particles are saturated, (f) a device or component for removing and replacing the particles in the final cycle of the particle charge lifetime, and (g) a device or component for recovering the target chemical from the particles such that the particles can be reused.
  • the apparatus can include one or more magnets that are installed to collect particles with magnetic cores in (d) and (f).
  • microfilter back flushing during intermediate timed cycles before the final particle collection can be performed with source solution from the aqueous source containing the target chemical.
  • the microfilter can be fritted stainless steel.
  • the microfilter can be formed polymeric material such that the flow of particles is along the center of the filter and the flow of collected water is radially out through the polymeric layer to collection of the water.
  • the produced water from (d) flows into a dual stage reverse osmosis system wherein the reject from one stage is sent to a second stage and the stages are switched to coincide with the timing of the particle cycles in (d).
  • the second stage reject water from the dual stages is combined with carbon dioxide from the air to react with calcium ions in the water to maintain acid-base balance and create calcium carbonate for disposal in the final reject water along with other ionic species that bind to calcium carbonate.
  • Another exemplary embodiments include a method of using the apparatus that removes target chemicals from water using particles down to 0.2 micrometers in size.
  • the method includes (a) supplying a source of an aqueous solution of the target chemical on demand to a reaction chamber, (b) adding and removing a slurry of particles using a reaction Attorney Docket No. 8003/0103PW01 chamber.
  • the method can include recirculating, using the reaction chamber, the particles after mixing with the aqueous solution of the target chemical.
  • the method further includes (c) timing the reaction between the particles and the target chemical such that the
  • concentration of the target chemical in the aqueous solution reaches a predetermined low level in a desired time, (d) removing the aqueous phase from the reactor while keeping the particles entrained inside the reactor using a microfilter that can be back flushed, (e) adding more aqueous solution to the reactor from the source and continuing the cycles until the particles are saturated, (f) removing and replacing the particles in the final cycle of the particle charge lifetime, and (g) recovering the target chemical from the particles such that the particles can be reused.
  • the method can include magnetically collecting particles with magnetic cores in (d) and (f) using one or more magnets.
  • microfilter back flushing during intermediate timed cycles before the final particle collection can be performed with source solution from the aqueous source containing the target chemical.
  • the microfilter can be fritted stainless steel.
  • the microfilter can be formed polymeric material such that the flow of particles is along the center of the filter and the flow of collected water is radially out through the polymeric layer to collection of the water.
  • the produced water from (d) flows into a dual stage reverse osmosis system wherein the reject from one stage is sent to a second stage and the stages are switched to coincide with the timing of the particle cycles in (d).
  • the second stage reject water from the dual stages is combined with carbon dioxide from the air to react with calcium ions in the water to maintain acid-base balance and create calcium carbonate for disposal in the final reject water along with other ionic species that bind to calcium carbonate.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne un appareil pour éliminer des produits chimiques cibles de l'eau qui comprend une chambre de réaction, une source d'une solution aqueuse des produits chimiques cibles qui peut être alimentée à la demande dans la chambre de réaction, un minuteur qui mesure une réaction entre les particules et les produits chimiques cible de telle sorte qu'une concentration des produits chimiques cibles dans la solution aqueuse atteint un niveau faible prédéterminé pendant une durée souhaitée, et des éléments pour éliminer la phase aqueuse du réacteur tout en gardant les particules entraînées à l'intérieur du réacteur en utilisant un microfiltre configuré pour être soumis à un refoulement, en additionnant de la solution aqueuse au réacteur à partir de la source et en continuant les cycles jusqu'à ce que les particules soient saturées, en éliminant et en remplaçant les particules dans un cycle final de durée de vie de charge d'une particule et en isolant les produits chimiques cibles des particules de telle sorte que les particules peuvent être réutilisées.
EP13746112.5A 2012-02-12 2013-02-11 Appareil pour l'utilisation de nanoparticules dans l'élimination de produits chimiques de solutions aqueuses suivie de la purification de l'eau Withdrawn EP2812285A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261597836P 2012-02-12 2012-02-12
PCT/US2013/025650 WO2013120112A2 (fr) 2012-02-12 2013-02-11 Appareil pour l'utilisation de nanoparticules dans l'élimination de produits chimiques de solutions aqueuses suivie de la purification de l'eau

Publications (2)

Publication Number Publication Date
EP2812285A2 true EP2812285A2 (fr) 2014-12-17
EP2812285A4 EP2812285A4 (fr) 2016-05-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13746112.5A Withdrawn EP2812285A4 (fr) 2012-02-12 2013-02-11 Appareil pour l'utilisation de nanoparticules dans l'élimination de produits chimiques de solutions aqueuses suivie de la purification de l'eau

Country Status (1)

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EP (1) EP2812285A4 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8922503D0 (en) * 1989-10-05 1989-11-22 Crossflow Microfiltration Ltd Causing phases to interact
FR2934258B1 (fr) * 2008-07-28 2010-08-27 Otv Sa Procede de traitement d'eau ultra rapide et installation correspondante.
FR2954174B1 (fr) * 2009-12-17 2014-04-11 Otvs A Procede de potabilisation et/ou d'epuration d'eau comprenant l'elimination d'un compose cible et une filtration au sein d'un tambour filtrant

Also Published As

Publication number Publication date
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