WO2013088185A1 - Procédé de dépollution de l'arsenic et compositions absorbantes enrobées pour ce faire - Google Patents

Procédé de dépollution de l'arsenic et compositions absorbantes enrobées pour ce faire Download PDF

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Publication number
WO2013088185A1
WO2013088185A1 PCT/IB2011/003051 IB2011003051W WO2013088185A1 WO 2013088185 A1 WO2013088185 A1 WO 2013088185A1 IB 2011003051 W IB2011003051 W IB 2011003051W WO 2013088185 A1 WO2013088185 A1 WO 2013088185A1
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Prior art keywords
substrate
recited
coated
arsenic
aqueous medium
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PCT/IB2011/003051
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English (en)
Inventor
Kalyan Das
Seethalakshmi Suresh
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General Electric Company
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Publication date
Application filed by General Electric Company filed Critical General Electric Company
Priority to PCT/IB2011/003051 priority Critical patent/WO2013088185A1/fr
Priority to IN4255CHN2014 priority patent/IN2014CN04255A/en
Priority to AP2014007686A priority patent/AP2014007686A0/xx
Priority to CN201180075553.8A priority patent/CN104066503A/zh
Publication of WO2013088185A1 publication Critical patent/WO2013088185A1/fr
Priority to CL2014001520A priority patent/CL2014001520A1/es

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/14—Diatomaceous earth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B01J20/28007—Sorbent size or size distribution, e.g. particle size with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3204—Inorganic carriers, supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/3236—Inorganic material layers containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • 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
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/485—Plants or land vegetals, e.g. cereals, wheat, corn, rice, sphagnum, peat moss
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
    • B01J2220/58—Use in a single column
    • 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
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C02F1/505—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment by oligodynamic treatment
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/103—Arsenic compounds
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/02—Odour removal or prevention of malodour
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • 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 application pertains to methods for making nano-sized iron oxide or iron oxyhydroxide particle coated onto a carrier microparticle substrate; coated adsorbent compositions including the nano-sized iron oxide or iron oxyhydroxide particles adsorbed onto the surface of the substrates; and to methods of using the coated adsorbent compositions to reduce As levels in aqueous media.
  • Arsenic is a naturally occurring element in the earth's crust and can be found in many natural ecosystems. Groundwater from intermediate aquifers of various parts of India and Bangladesh was found to contain arsenic above the permissible limit of 50 ppb. Under conditions of prolonged exposure to arsenic, many organs may be damaged, skin pigmentation may occur, hair may fall out, and nail growth may stop. Arsenic related health effects are usually not acute, but mostly encompass cancer, mainly skin cancer. Arsenic may cause low birth weight and spontaneous abortion. The WHO recommended limit for As is 10 ppb. Thus, the water from many tube wells and hand pumps may not be fit for human consumption.
  • Arsenic contamination of ground water therefore assumes a serious public health issue as groundwater serves more than 80% of the drinking water needs primarily in the public sector in India. There is no indication of presence of arsenic, because arsenic does not have smell, color, and taste.
  • a method of reducing arsenic content in an aqueous medium wherein the arsenic in the medium is contacted by a coated adsorbent substrate which is a microparticle substrate coated by iron oxide/oxyhydroxide particles.
  • the substrate is chosen from celite, raw diatomite, and rice husk ash.
  • arsenic concentration in the medium is reduced to less than 10 ppb arsenic.
  • the iron oxide/oxyhydroxide nanoparticles that are coated onto the substrate are nanoparticles having particle sizes of from about
  • the aqueous medium may then be contacted with a polishing unit that is adapted to reduce microbiological content, odor and/or color of the aqueous medium.
  • the substrate will have a particle size distribution ranging about 10 to 200 microns.
  • a water purifier in another aspect of the invention, comprises an inlet for entry of an arsenic containing feedwater therein and located downstream from the inlet; an outlet is provided for the exit of reduced arsenic content water.
  • the water purifier may comprise a plurality of replaceable cartridge-type units and, in certain embodiments, a prefilter is disposed downstream from the inlet to reduce suspended solids in the feedwater.
  • An adsorption bed may be provided downstream from the prefilter and is in fluid communication with the prefilter. The adsorption bed comprises a multiplicity of coated adsorbent microparticles therein that are adapted to reduce arsenic content of the feedwater when contacted with the feedwater.
  • the coated adsorbent particles include a substrate composed of celite, raw diatomite, rice husk ash, or a combination of these, and an adsorbent coating layer on the substrate.
  • the adsorbent coating layer comprises iron oxide/oxyhydroxide nanoparticles having particle sizes on the order of from about 20 to about 100 nanometers.
  • the water purification device comprises a polishing section located downstream from the adsorption bed and upstream from the outlet.
  • the polishing section is adapted to reduce microorganism content, color, and/or odor of the feedwater.
  • the polishing section comprises a bacteria growth inhibitor such as silver metal.
  • the adsorption bed in some embodiments, may comprise a packed column of coated adsorbent particles, and the prefilter may comprise an ultrafiltration (UF) or microfiltration (MF) membrane.
  • UF ultrafiltration
  • MF microfiltration
  • coated adsorbent substrates comprising providing substrate microparticles from the group consisting of celite, raw diatomite, and rice husk ash and mixtures thereof.
  • the substrate particles have particle sizes of from about 10 to 200 microns.
  • the substrate particles are added to an aqueous medium to which ferric chloride and HCl are also added.
  • the medium is heated to about 98-100 °C with stirring.
  • the reactants are retained in suspension for about 24 hours, and then the solids are separated from the medium.
  • the reactants namely ferric chloride and hydrochloric acid
  • the aqueous medium are heated slowly (slow nucleation) or heated fast (fast nucleation) to attain the desired temperature of 100 °C
  • different iron species are formed.
  • the resultant product is spherical ferric oxide (Fe 2 0 3 ) nanoparticles of about 100 nm in size.
  • the product is iron oxyhydroxide (FeOOH).
  • FeOOH iron oxyhydroxide
  • the iron oxide (Fe 2 0 3 ) nanoparticles form under distinct conditions.
  • water is heated to about 100 °C and then ferric chloride and the catalyst (i.e., HCl) are added to the heated water.
  • the catalyst i.e., HCl
  • Fe 2 0 3 nanoparticles are formed: this is a single phase product characterized by XRD.
  • the slow nucleation method water, ferric chloride, and HCl are placed together in the reaction vessel, and the mixture is slowly heated.
  • this "slow” nucleation method when the temperature of the mixture reaches about 70°C, hydrolysis begins, and FeOOH nanoparticles start to form. Formation of the FeOOH nanoparticles then continues until the temperature of the reaction mixture reaches about 100 °C. Again, this is a single phase product characterized by XRD.
  • the separated solids are characterized as a multiplicity of coated adsorbent substrate microparticles having iron oxide/oxyhydroxide particles adsorbently coated on the substrate.
  • the iron oxide/oxyhydroxide particles have particle sizes of from about 20 to 100 nanometers.
  • the separated solid materials may be washed, and the washing step may be monitored for one or more parameters selected from the group consisting of iron content, chloride content, conductivity, and pH.
  • the aqueous medium is maintained at a pH of about 1-2 during the reaction.
  • Fig. 1 is a schematic diagram illustrating a method for producing a coated adsorbent in accordance with the invention
  • Fig. 2 is a schematic diagram showing a container or sieve containing the coated adsorbent particles
  • Fig. 3 is a schematic illustration of a water purification device including a replaceable cartridge or layer of coated adsorbent particles;
  • Fig. 4 is a graph showing As remediation levels in accordance with Example 2 of the specification.
  • Exemplary embodiments of this invention are related to a composition, process for making the composition, and water purification device for reducing arsenic levels in water systems including potable water systems.
  • a composition is provided that comprises a substrate chosen from celite (calcined diatomaceous earth), raw diatomite, and rice husk ash or a mixture of these wherein the substrate is coated with iron oxide/oxyhydroxide nanoparticles.
  • a method is provided to synthesize iron oxide/oxyhydroxide nanoparticles by a fast nucleation method and a coating of the nanoparticles on the above-mentioned substrates in situ to form a coated adsorbent composition.
  • celite may be mentioned as exemplary and (also known as diatomite or kieselgur) is a naturally occurring soft, siliceous, porous material typically having particle sizes between 10 and 200 microns. Celite contains -80-90% silica, 2-4% alumina and 0.5 to 2% iron oxide.
  • Raw diatomite may also be mentioned as exemplary and is similar to celite in composition.
  • Another naturally occurring raw material namely rice husk
  • rice husk is also exemplary and, when burnt, produces rice husk ash. It is also a highly siliceous (-80-90% silica and
  • RHA 5-10% activated carbon
  • porous material 5-10% activated carbon
  • RHA may also be used as a substrate onto which the nano-sized iron oxide/oxyhydroxide particles are coated.
  • arsenic levels in drinking water are reduced when the drinking water is contacted with the coated adsorbent compositions comprising iron oxide/oxyhydroxide nanoparticles adsorbed onto the aforementioned substrates.
  • this interaction removes As (III) levels in the water to ⁇ 10 ppb. It is thought that the coated nanoparticles provide an increased surface area and thus, increased active sites, on which the contact occurs, and when the coated adsorbent compositions are packed in columns or the like, they provide a tortuous path for the drinking water to traverse during such contact.
  • the coated nanoparticles interact with As species in the drinking water to form an arsenic-iron complex which may be characterized as a non- leachable bidentate binuclear complex, — Fe— 0— As— O(OH)— Fe, which is adsorbed on the coated substrate.
  • the treated water shows greatly reduced As levels.
  • a bed including such coated nanoparticles will function optimally until there are not enough active iron oxide/oxyhydroxide sites available for interaction with the arsenic species. Slowly, the concentration of these active sites will decrease, leading to inefficiency. Once the saturation of these sites is achieved, the bed will no longer effectively remove arsenic, and both the input and output concentrations will be the same.
  • Fig. 1 of the drawings there is schematically shown a celite, raw diatomite, or rice husk ash substrate particle 2 and suspension of Fe- oxide/oxyhydroxide nanoparticles 4 in an aqueous medium 10.
  • the iron oxide/oxyhydroxide nanoparticles are adsorbed onto the surface of the substrate to form a coated adsorbent particle 6.
  • the iron oxide/oxyhydroxide particles are formed via an acid hydrolysis reaction using HCl as a catalyst to promote the hydrolysis of FeCl 3 in aqueous media.
  • the iron oxide/oxyhydroxide particles are nano-sized, on the order of from about 20-100 nm.
  • a multiplicity of the coated adsorbent particles 6 may then be provided in layers on other dispositions which may be structured to form a filter cartridge 8.
  • the desired As containing aqueous medium is brought into contact with the filter cartridge to effect As reduction in the medium.
  • Fig. 3 there is shown an integrated water purifier in accord with one exemplary embodiment of the invention. As shown, influent water is fed from inlet 20 via gravity feed from an upstream to downstream direction through a coarse filter or pre-filter section 22, then to adsorption bed 28 including the coated adsorbent particles and then through a polishing section 30 to exit the device as shown at 32 wherein the thus treated aqueous medium exhibits reduced As content.
  • the coarse granular sand filter section 22 can comprise a coarse filter also known as a pre-filter to remove suspended solids. Further, the pre-filter may comprise layers of fibers or membranes designed to capture suspended particles.
  • the following filter media may be mentioned as exemplary: nylon 66, polytetrafluoroethylene, polypropylene, resin-bonded glass fibers, and cellulosic materials.
  • the coarse filter or prefilter 22 can comprise conventional ultrafiltration (UF) and/or microfiltration (MF) membranes.
  • UF membranes are adapted to remove colloidal particles on the order of 0.01-1.0 micron
  • MF membranes are adapted to remove particulate matter greater than 1.0 micron.
  • the UF or MF membranes may be made of a polymeric material such as polyvinylidene fluoride (PDF) or a ceramic material such as titanium oxide, zirconium oxide, or aluminum oxide.
  • PDF polyvinylidene fluoride
  • the physical configuration of the UF or MF membranes may be hollow fiber, tubular, flat sheet, or spiral wound. The direction of water flow through the hollow fiber UF or MF membranes may be outside-in or inside-out.
  • Preferred UF membranes are part of the "Zeeweed"TM membrane technology products sold by GE.
  • Arsenic removal layer or absorption bed 28 may, for example, be a packed column of glass or charcoal impregnated with the coated adsorbent compositions, namely, the nanoparticle iron oxide/oxyhydroxide particles adsorbed onto the desired substrates. This layer 28 is in fluid contact with layer 22. The flowing water exiting from layer 22 is brought into contact with the coated adsorbent particles in the adsorption bed 28 to reduce As (I1I) levels in the water to 10 ppb or less.
  • polishing section 30 Located downstream from adsorption bed 28 and in fluid contact therewith is polishing section 30.
  • the polishing unit 30 may be employed to reduce microorganism content, color, odor, etc., if needed.
  • the polishing unit may be composed of replaceable cartridge types and, in one embodiment, include a bacterial growth inhibitor.
  • the bacterial growth inhibitor is an oligo-dynamic metal such as silver. Other materials such as activated carbon can also be mentioned.
  • the polishing unit 30 may comprise a host of materials such as microporous carbon filtration blocks, silvered microporous carbon filtration blocks, granular activated carbon, silvered granular activated carbon, microporous ceramic filtration blocks, ultrafiltration membranes, nanofiltration membranes, chelating cation exchange resin, strong acid cation exchange resin, weak acid cation exchange resin, strong base anion exchange resin, weak base anion exchange resin, macroporous anion exchange resin, granular absorbents, iodinated ion-exchange resin and specialized lead removal media. Reduced As content potable water exits the filter unit as shown at 32.
  • Ferric chloride and HC1 are added to water, and the water is heated to about 100 °C. Thereafter, celite particles, raw diatomite, and/or rice husk ash particles are added to the heated water, and the reactants are maintained in suspension for 24 hours under slight agitation. Solids are separated from the liquid, and the thus coated particles are dried in an oven at 100 °C for 10-12 hours followed by removal of unreacted ferric chloride, HC1, and unadsorbed iron oxide/oxyhydroxide nanoparticles by washing with water. The completion of washing is monitored by measurement of pH, ionic conductivity, and iron content. The product is further dried in the oven at 100 °C for an additional 10-12 hours.
  • HC1 is used as a catalyst to promote the hydrolysis of FeCl 3 .
  • Trials have been conducted with different quantities of HC1 (0.1 ml, 0.2 ml, 0.5 ml, 0.75 ml, 1 ml, 3 ml, and 5 ml of HC1 for 12 g (0.073 mole) of FeCl 3 in 665 mL H 2 0.
  • the thus synthesized iron oxide/oxyhydroxide nanoparticles were found to be on the order of -50-100 nm.
  • the reaction is carried out at an acidic pH of 1-2.
  • the pH, conductivity, and iron content of the washed water are measured.
  • the first step in the - measurement protocol involves the identification of chloride in the eluted water.
  • the washing process is typically carried out until the pH is about 5.
  • Other parameters that signal completion of the washing step include conductivity measurement to obtain wash water conductivity of about 0.1 mS/cm, and iron content of the washed water of about 10-20 ppb (from Inductivity Coupled Plasma analysis).

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  • Condensed Matter Physics & Semiconductors (AREA)
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  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

L'invention concerne des procédés de fabrication de dispersions de particules d'oxyde de fer ou d'oxyhydroxyde de fer de taille nanométrique, dans lesquels les particules sont déposées sur un substrat support. En outre, les compositions absorbantes enrobées sont additionnées de et comprennent des particules d'oxyde de fer ou d'oxyhydroxyde de fer de taille nanométrique adsorbées sur la surface du substrat. De plus, l'invention concerne également des procédés d'utilisation des compositions adsorbantes enrobées afin de réduire les teneurs en arsenic dans des milieux aqueux. Elle concerne aussi des unités de purification de l'eau, qui comprennent une couche adsorbante.
PCT/IB2011/003051 2011-12-15 2011-12-15 Procédé de dépollution de l'arsenic et compositions absorbantes enrobées pour ce faire WO2013088185A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/IB2011/003051 WO2013088185A1 (fr) 2011-12-15 2011-12-15 Procédé de dépollution de l'arsenic et compositions absorbantes enrobées pour ce faire
IN4255CHN2014 IN2014CN04255A (fr) 2011-12-15 2011-12-15
AP2014007686A AP2014007686A0 (en) 2011-12-15 2011-12-15 Arsenic remediation methods and coated adsorbent compositions therefor
CN201180075553.8A CN104066503A (zh) 2011-12-15 2011-12-15 砷污染整治方法和用于此方法的包覆吸附剂的组合物
CL2014001520A CL2014001520A1 (es) 2011-12-15 2014-06-10 Metodo para reducir la concentracion de arsenico en un medio acuoso que comprende poner en contacto el medio acuoso con un substrato adsorbente recubierto y adsorber el arsenico, donde dicho substrato contiene microparticulas recubiertas con nanoparticulas de oxido de hierro; purificador de agua; y metodo para fabricar dichos substratos

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CN105923730A (zh) * 2016-06-20 2016-09-07 江门市江海区炜洁净水材料有限公司 一种纳米净水剂
CN105923728A (zh) * 2016-06-20 2016-09-07 江门市江海区炜洁净水材料有限公司 一种硅藻净水剂
CN108212112A (zh) * 2018-02-07 2018-06-29 宁波甬凌新材料科技有限公司 一种处理重金属污水的统糠改性材料及其制备方法和应用
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CN110743491A (zh) * 2019-10-11 2020-02-04 江苏理工学院 一种α-FeOOH@硅藻土复合材料的制备方法及应用
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US10781109B2 (en) 2015-10-09 2020-09-22 Nippon Soda Co., Ltd. Iron oxyhydroxide nanodispersion liquid
CN105771911A (zh) * 2016-03-03 2016-07-20 云南圣清环保科技有限公司 一种加载β型羟基氧化铁改性天然纤维素功能型材料及其制备方法与应用
CN105771911B (zh) * 2016-03-03 2018-05-18 云南圣清环保科技有限公司 一种加载β型羟基氧化铁改性天然纤维素功能型材料及其制备方法与应用
CN105923730A (zh) * 2016-06-20 2016-09-07 江门市江海区炜洁净水材料有限公司 一种纳米净水剂
CN105923728A (zh) * 2016-06-20 2016-09-07 江门市江海区炜洁净水材料有限公司 一种硅藻净水剂
WO2019017848A1 (fr) * 2017-07-20 2019-01-24 Planet Care Procédé et dispositif d'élimination de particules, de préférence de microfibres, des eaux usées
EP3655365B1 (fr) * 2017-07-20 2022-06-08 Planet Care Resitve za okolje, d.o.o Procédé et dispositif d'élimination de particules des eaux usées
CN108212112A (zh) * 2018-02-07 2018-06-29 宁波甬凌新材料科技有限公司 一种处理重金属污水的统糠改性材料及其制备方法和应用
US11396004B2 (en) 2019-03-15 2022-07-26 Access Business Group International Llc Nano-enabled activated carbon blocks to enable removal of oxyanions from water

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