WO2008025356A1 - Purification d'eau avec élimination d'arsenic - Google Patents

Purification d'eau avec élimination d'arsenic Download PDF

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Publication number
WO2008025356A1
WO2008025356A1 PCT/DK2006/000477 DK2006000477W WO2008025356A1 WO 2008025356 A1 WO2008025356 A1 WO 2008025356A1 DK 2006000477 W DK2006000477 W DK 2006000477W WO 2008025356 A1 WO2008025356 A1 WO 2008025356A1
Authority
WO
WIPO (PCT)
Prior art keywords
iodine
water purification
resin
unit according
water
Prior art date
Application number
PCT/DK2006/000477
Other languages
English (en)
Inventor
Mikkel Vestergaard Frandsen
Original Assignee
Vestergaard Sa
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 Vestergaard Sa filed Critical Vestergaard Sa
Priority to PCT/DK2006/000477 priority Critical patent/WO2008025356A1/fr
Priority to PCT/DK2007/000386 priority patent/WO2008025358A1/fr
Priority to CNA2007800368204A priority patent/CN101522578A/zh
Priority to TW96132091A priority patent/TW200833616A/zh
Publication of WO2008025356A1 publication Critical patent/WO2008025356A1/fr

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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/002—Processes for the treatment of water whereby the filtration technique is of importance using small portable filters for producing potable water, e.g. personal travel or emergency equipment, survival kits, combat gear
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C02F9/20—Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C02F1/766—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine
    • 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
    • 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
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3222—Units using UV-light emitting diodes [LED]
    • 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
    • C02F2303/00—Specific treatment goals
    • C02F2303/18—Removal of treatment agents after treatment
    • C02F2303/185—The treatment agent being halogen or a halogenated compound
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • the present invention relates to portable systems and methods for removing arsenide from ground water
  • Arsenic is a naturally occurring contaminant found in a large number of ground wa- ters, for example in Bangladesh and a number of states in the US. Being without odour and taste, no warnings are typically recognised during consumption of arsenic containing water. Especially in Bangladesh, many people are suffering from chronic poisoning appearing with painful, disturbed skin pigmentation and calluses on the palms and the hands. For example, according to information on the Internet site http://www.sos- arsenic.net, in India, 48.7% water smaples had arsenic concentration above 10 ppb and 23.8% above 50 ppb. In Bangladesh these values were 43.0% and 31.0% respectively.
  • arsenic occurs in water in trivalent form and in pentavalent form, where the trivalent Arsenite As +3 form is regarded as more toxic, whereas the pentavalent Arsenate form As +5 is easier to remove. Therefore, As +3 is oxidised to As +5 in conventional processes in order to remove the entire As content to below certain levels, typically to less than 10 micrograms per litre corresponding to 10 ppb (parts per billion).
  • a system for As removal from ground water is disclosed in US patent No. 6,461,535 by de Esparza.
  • a clay a coagulant, such as ferric chloride and aluminium sulphate, and an oxidizer, such as calcium hypochlorite, are used for adsorbing the arsenic onto the coagulated colloidal mixture.
  • a coagulant such as ferric chloride and aluminium sulphate
  • an oxidizer such as calcium hypochlorite
  • EP 1 568 660 for removing As with a strong base anion exchange resin comprising at least one metal ion or metal-containing ion whose arsenate salt has a K 31 , no greater than 10 "5 .
  • the unit is marketed under the name LifeStraw® by the Vestergaard Frandsen Group.
  • the unit is used for water filtration by sucking water from the water source directly through the unit and into the mouth.
  • the suction unit is compact and has a mouth piece, measures only 25 cm in length and 29 mm in width, and acts instantaneous in order for the water sucked through the unit to be safe for human consumption.
  • the unit contains a specially developed halogen-based resin that is extraordinarily effective to kill bacteria, for example bacteria, such as Shigella, Salmonella, Enterrococus, Staphylococcus Aureus and E .CoIi, on contact, a textile pre-filters to remove particles larger than to 6 microns, and activated carbon to withhold excessive iodine and bad smell & taste.
  • bacteria such as Shigella, Salmonella, Enterrococus, Staphylococcus Aureus and E .CoIi
  • This unit removes efficiently disease causing micro organisms which spread diarrhoea, dysentery, typhoid, and cholera.
  • a water purification unit having a number of compartments for water flow successively through these compartments, the unit comprising - a compartment with an iodine releasing resin for killing microbes in water,
  • iodine scavenger configured for releasing chlorine during iodine scavenging, the amount of released chlorine being configured for oxidation of trivalent arsenide to pentavalent arsenide, - a further downstream compartment with a arsenide removal resin configured for removal of arsenide from the water.
  • a compact device for not only cleaning water on a general basis but also for removing arsenic.
  • the compact property is achieved by using the chlorine — which in LifeStraw® is a waste product — for successful oxidation of arsenic in order to facilitate removal of arsenic.
  • no additional substances are required for oxidising arsenic, which is in contrast to prior art techniques, where a variety of substances is added for the oxidation of arsenide.
  • the invention utilises a combination of knowledge from entirely different fields, namely the know-how of cleaning water in primarily poor tropical countries with compact, portable units like LifeStraw® and the know-how of arsenic removal in modern household apparatuses or larger facilities.
  • application of the invention is not limited to poor and remote regions but may be used in a variety of other applications.
  • the user may be sure that the light weight, portable unit, such as an extended, arsenic removing LifeStraw®, prevents later suffering from arsenic induced illness due to the double function of the invention, where biological and chemical cleaning is performed at the same time at a degree which makes direct drinking through a unit according to the invention possible.
  • the iodine scavenger resin is a strong ion exchange resin, for example a strong base anion exchange resin. Choosing such a resin promotes the compactness of the unit. It is well known to use activated carbon for iodine removal. However, this substance is not as efficient as strong ion exchange resins and rather large quantities are required. In order to achieve a compact unit, especially in the case of the LifeStraw® product, a strong base anion exchange resin has been investigated instead. The use of this resin, as described above, opens the possibility for arsenic oxidation without loosing compactness.
  • arsenic removing resin that comprises activated alumina, for example as known from the commercially available Alcan® resin named AAFS50.
  • the arsenic removing resin comprises ferric oxide, for example as known from the commercial Adedge® resins named AD33R or AD33L.
  • These commercially available resins contain substances for arsenic oxidation themselves.
  • the chlorine oxidation of As(III) to As(V) may be used to reduce the amount of these commercial resins, such that primarily the As(V) removal property is utilised.
  • a reduction of the amount of such commercial resins is of high interest due to the substantial costs of these resins. For this reason also, a thin layer of ferric oxide, possibly enriched with or substituted by aluminium oxide, is considered as a useful solution.
  • the iodine needs to be active for a certain time in order to achieve a good result with respect to biological cleaning.
  • the active time depends on the flow from the iodine releasing resin to the iodine scavenger.
  • the activation time may be necessary to be extended, which can be achieved by including a void space between the iodine releasing resin and the iodine scavenger resin.
  • the volume of the void space should in this case be chosen to provide a substantial extension of the reaction time between the iodine and water contaminants during the water flow through the volume typical for the device when sucked by a mouth.
  • substantially extension covers an extension of the flow time which, typically, is in the order of the flow time through the iodine releasing resin compart- ment.
  • the void space may have a volume comparable to the volume of the compartment with the iodine releasing resin.
  • the flow time is 100-150 ml/minute, which is also feasible for the invention in the case of a comparable design.
  • a compartment may, optionally, be provided with activated carbon for iodine removal, for example in the form of granular activated carbon (GAC).
  • GAC granular activated carbon
  • the GAC may be silver loaded.
  • the activated carbon may be used downstream of the iodine scavenging resin.
  • This configuration has the advantage that the scavenging resin primarily takes up the iodine and releases correspondingly chlorine for the arsenic oxidation, for example in the form of hypochlorite with a large amount of active chlorine.
  • the activated carbon is mixed with the iodine scavenger resin. In this case, the activated car- bon takes up part of the iodine without release of chlorine.
  • activated carbon which is able to take up iodine without release of chlorine
  • the iodine scavenger resin that is able to release chlorine as a result of the uptake of iodine
  • a desired ratio between the uptake of iodine and the release of chlorine may be achieved in accordance with predetermined amounts necessary for a proper arsenic oxidation on the one hand and a long term, low cost functioning of the device on the other hand, securing sufficient iodine release and removal.
  • the invention can be employed in a number of physical embodiments.
  • the preferred solution utilising the potential for high compactness is a portable water purification unit, for example tubular as the LifeStraw® product.
  • the unit is advantageously shorter than 40 cm, or even shorter than 35 cm.
  • LifeStraw® has a length of 25 cm, a width of 29 mm, and a dry weight of 95 grams.
  • the unit in the portable embodiment is preferred to have a diame- ter of less than 50 mm, rather less than 40 mm.
  • Such a tube may be provided with a mouth peace for sucking of water through the unit, just like LifeStraw®.
  • the amount and efficiency of the iodine releasing resin should be adjusted to achieve a certain arsenic removal, for example down to a level of less than 10 ppb.
  • the amount of resin necessary to achieve this is dependent on the arsenic content in the water, and the final arsenic level to be achieved.
  • the unit according to the invention may be configured to release a certain amount of iodine in the water; the amount and efficiency of the iodine scavenger resin may then be configured - in dependence of the certain amount of iodine - to release a certain amount of active chlorine in the wa- ter; this certain amount of active chlorine is configured for oxidation of a substantial amount of arsenide.
  • the resin may be configured for secure working also at high contents of arsenic, for example of the order of up to 1000 or 2000 parts per billion.
  • the level of arsenic in many water sources in Bangladesh is 1200 ppb ex- ceeding by far the admissible limit of 50 ppb for the Bangladesh drinking water.
  • the unit according to the invention may use the aforementioned removal of arsenic as a pre-stage for a second removal stage.
  • the iodine scavenger may release sufficient chlorine to remove more than 50% of the arsenic, for example 99% or even 99.9% of it.
  • a second stage for example, comprising the aforementioned AD33 from Adedge® or AFSS50 from Alcan®, the remaining arsenic content may be removed to a very low degree.
  • a multiple stage arrangement may be useful in the case, where a first product is used for removing the first part of arsenic, for example 95%, and the second stage is used to reduce the content to a very low degree.
  • the reason for using two stage removal could be that the first product is by far cheaper than the second product.
  • a low cost first stage may be used for removing the first coarse arsenic content
  • the sec- ond, more expensive stage may be used to remove the last part of the arsenic below a predetermined level, such as 10 ppb.
  • the aim is to reduce the arsenic to below a very low level, for example the Internationally recognised lower level of 10 parts per billion.
  • the amount of iodine releasing resin is, typically, between 5 and 30 %, preferably between 15 and 25 %, of the inner volume of the unit.
  • the amount of iodine scavenger resin is, typically, between 5 and 40 %, preferably, between 20 and 30 % of the inner volume of the unit.
  • the amount of arsenic removing resin is, typically, between 5 and 50 % of the inner volume of the unit. If present, the amount of activated carbon is, typically, between 20 and 40 % of the inner volume of the unit.
  • a preferred water purification unit is a portable unit with a mouthpiece for sucking water through the unit, the length of the unit is less than 40 cm, the diameter is less than 50 mm.
  • the amount of iodine releasing resin is between 5 and 50 % of the inner volume of the unit, the amount of iodine scavenger resin is between 5 and 50 % of the inner volume of the unit, and the amount of arsenic removing resin is between 5 and 50 % of the inner volume of the unit.
  • the water purification unit has a length of around 25 cm and a diameter of around 30 mm.
  • the amount of iodine releasing resin is between 10 and 30 % of the inner volume of the unit
  • the iodine scavenger resin is a strong base anion exchange resin with a volume between 10 and 30 % of the inner volume of the unit
  • the arsenic removing resin is AD33 or AAFS50 or a mixture of AD33 or AAFS50 with a volume of between 5 and 50 % of the inner volume of the unit.
  • the purification unit may comprise a compartment with activated carbon for iodine removal.
  • the amount of activated carbon is between 5 and 50 %, or rather between 20 and 40% of the inner volume of the unit.
  • the carbon may be silver loaded.
  • All the above mentioned different embodiments may be included in a method for purification of water, the method comprising establishing a flow of water through a number of successive compartments,
  • a unit according to the invention is preferably dimensioned so as to be a portable filter unit, especially with a mouthpiece and dimensions as the LifeStraw® product. How- ever, other dimensioning is possible. Also, instead of a mouthpiece the unit may be provided with tubing for a controlled water flow and proper connection, such as in a household filter unit.
  • the unit according to the invention may be used as part in a water bag, where extrac- tion of the water from the water bag is through a unit according to the invention.
  • the extraction may occur by actively sucking water out of the bag, by exerting pressure on the bag, or the extraction may occur by gravity, a principle known from the products Katadyn Camp® and the Katadyn Siphon® made by the Swiss company Katadyn Pro- dukte AG.
  • An additional cleaning means that may be incorporated in the unit according to the invention is an ultra violet (UV) lamp, for example as it is disclosed US patent application No. 2005/258108.
  • UV ultra violet
  • Such a lamp may be used in addition to the above means for cleaning the water.
  • the UV LED (Light Emitting Diode) lamp may be used for disinfection under those circumstances, where the chemistry in the unit is not sufficient.
  • the unit may still be able to perform satisfactory, even when the contamination suddenly overshoots expectations for contamination levels.
  • An on-off procedure of an UV LED requires some means for measuring the actual contamination level or means for registering the lack of total removal of contaminants.
  • the latter may be performed with an electronic circuit, the conduction through which is governed by the contamination.
  • the water is believed to should have been cleaned and a high conduction in the water would indicate an unsatisfactory cleaning.
  • An electronic circuit in the unit may as well be used for indicating, whether the cleaning process is satisfactory within predetermined levels on a general basis.
  • a small electronic circuit and a battery or solar cell may be used to illuminate a lamp or to change colour of an indicator in order to show missing function, for example when the chemical products are exhausted.
  • FIG. 1 illustrates a first embodiment according to the invention
  • FIG. 2 illustrates a second embodiment according to the invention.
  • FIG. 1 illustrates a first embodiment of a unit according to the invention.
  • the unit 1 has a water inlet 2 for inlet of a contaminated water flow 3 containing As and a water outlet 4 for 5 outflow of cleaned, arsenic-free water.
  • the unit 1 comprises a first compartment 6 with an iodine releasing resin for release of iodine, which is illustrated by arrow 11.
  • the iodine is primarily used for killing microbes. Water with iodine flows into a downstream compartment 7 with an iodine removing resin, where iodine is removed as illustrated by the stopping of arrow 11 and chlorine released, which is illus- trated by arrow 12.
  • the chlorine from compartment 7 oxidizes As(III) to As(V), such that the amount of As(III) is gradually reduced, which is illustrated by the arrow 9.As(V) is removed by the arsenic removal resin in compartment 8, which is illustrated by the arrow 10.
  • the unit in FIG. 1 may be used for water cleaning and arsenic removal, although FIG. 1 illustrates only the basic principles and may be supplemented with other means to optimize the functioning.
  • An improved system is illustrated in FIG. 2.
  • the unit 1 may in addition have a chlorine removing compartment 13.
  • the resin in this compartment 13 may be activated carbon in the granular form (GAC), optionally silver loaded.
  • GAC granular form
  • the water inlet 2 may be followed by a mechanical filter 15 in order to filter away larger particles or microbes.
  • the mechanical filter may be textile filter for removing particles or microbes with a size larger than 6 micrometer, as it is used in the LifeStraw® product.
  • a mouth piece 16 is illustrated in FIG. 2 as a water outlet.
  • LifeStraw® as illustrated in FIG. 1, comprises a mouthpiece 22 with a removable end cap 21 and another end cap 33 covering an inlet clip 3 in the opposite end of the tubular body 26.
  • a thin polypropylene filter 15 covers an polyethylene bag as the water entrance with a thick polypropylene filter 28 just before a compartment filled with iodine releasing resin 29.
  • Another filter arrangement 28, 24 with a strainer 27 is found after the iodine compartment. Separated by a void space 20, is a GAC containing compartment 25.

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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)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Water Treatment By Sorption (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

L'invention concerne la purification d'eau dans une unité comportant plusieurs compartiments, l'eau s'écoulant successivement d'un compartiment à l'autre. L'unité comprend: un compartiment contenant une résine de libération d'iode destinée à tuer les microbes présents dans l'eau; un compartiment aval contenant un capteur d'iode configuré pour pour libérer du chlore au cours du piégeage de l'iode, la quantité de chlore libéré étant déterminée pour l'oxydation d'un arséniure trivalent en arséniure pentavalent; un autre compartiment aval contenant une résine d'élimination de l'arséniure conçu pour éliminer l'arséniure de l'eau.
PCT/DK2006/000477 2006-09-01 2006-09-01 Purification d'eau avec élimination d'arsenic WO2008025356A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/DK2006/000477 WO2008025356A1 (fr) 2006-09-01 2006-09-01 Purification d'eau avec élimination d'arsenic
PCT/DK2007/000386 WO2008025358A1 (fr) 2006-09-01 2007-08-25 Purification d'eau comprenant une désinfection, une oxydation et une élimination d'arsenic
CNA2007800368204A CN101522578A (zh) 2006-09-01 2007-08-25 包括消毒、氧化和砷去除的水纯化
TW96132091A TW200833616A (en) 2006-09-01 2007-08-29 Water purification including arsenic removal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2006/000477 WO2008025356A1 (fr) 2006-09-01 2006-09-01 Purification d'eau avec élimination d'arsenic

Publications (1)

Publication Number Publication Date
WO2008025356A1 true WO2008025356A1 (fr) 2008-03-06

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PCT/DK2006/000477 WO2008025356A1 (fr) 2006-09-01 2006-09-01 Purification d'eau avec élimination d'arsenic
PCT/DK2007/000386 WO2008025358A1 (fr) 2006-09-01 2007-08-25 Purification d'eau comprenant une désinfection, une oxydation et une élimination d'arsenic

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PCT/DK2007/000386 WO2008025358A1 (fr) 2006-09-01 2007-08-25 Purification d'eau comprenant une désinfection, une oxydation et une élimination d'arsenic

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CN (1) CN101522578A (fr)
TW (1) TW200833616A (fr)
WO (2) WO2008025356A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010006274A1 (fr) * 2008-07-10 2010-01-14 Water Security Corporation Filtre avec résine iodée et indicateur de vie du filtre
US8535531B2 (en) 2008-04-23 2013-09-17 Water Security Corporation Halogenated resin beds

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011071605A1 (fr) 2009-12-07 2011-06-16 Fresenius Medical Care Holdings, Inc. Cartouche de purification d'eau utilisant des sorbants échangeurs d'ions zirconium
WO2011110173A1 (fr) 2010-03-08 2011-09-15 Vestergaard Sa Dispositif de purification de l'eau possédant un élément soupape surmoulé

Citations (4)

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