EP1343730A1 - Method for treating water containing manganese - Google Patents

Method for treating water containing manganese

Info

Publication number
EP1343730A1
EP1343730A1 EP01993589A EP01993589A EP1343730A1 EP 1343730 A1 EP1343730 A1 EP 1343730A1 EP 01993589 A EP01993589 A EP 01993589A EP 01993589 A EP01993589 A EP 01993589A EP 1343730 A1 EP1343730 A1 EP 1343730A1
Authority
EP
European Patent Office
Prior art keywords
water
carried out
bed
manganese dioxide
manganese
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Withdrawn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
EP01993589A
Other languages
German (de)
French (fr)
Inventor
Frédéric LEFORT
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.)
Veolia Water Solutions and Technologies Support SAS
Original Assignee
OTV 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 OTV SA filed Critical OTV SA
Publication of EP1343730A1 publication Critical patent/EP1343730A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2031—Metallic material the material being particulate
    • B01D39/2034—Metallic material the material being particulate sintered or bonded by inorganic agents
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C02F1/64—Heavy metal compounds of iron or manganese
    • 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
    • C02F1/283—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
    • C02F1/66—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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/203—Iron or iron compound
    • 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
    • C02F2101/206—Manganese or manganese compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/902—Materials removed
    • Y10S210/911—Cumulative poison
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/902—Materials removed
    • Y10S210/911—Cumulative poison
    • Y10S210/912—Heavy metal

Definitions

  • the present invention relates to a water treatment method. More specifically, the invention relates to a process for the purification of water intended for human consumption, with a view to eliminating manganese and possibly other metals, such as ferrous iron.
  • the principle of manganese elimination is based on its oxidation and on the retention of the insoluble oxides thus formed (MnO 2 , Mn 2 O 3 ) on filters. Oxidation with oxygen is generally not possible, the addition of strong oxidants is necessary to achieve sufficient redox potentials. The most commonly used oxidant in this context is permanganate.
  • the traditional physico-chemical process of demanganization of water consists in chemically oxidizing the manganese contained in it using potassium permanganate, chlorine or ozone, then filtering it on a granular material such as, for example sand.
  • a granular material such as, for example sand.
  • This can be coated with manganese dioxide precipitates after a few months and form what is called a natural "green sand".
  • This "green sand" can also be prepared by depositing beforehand a film of hydrated manganese dioxide on the surface of a support which may be sand, acid clay, anthracite, zeolite, a dolomitic material, etc.
  • Manganese dioxide is then considered to act as a catalyst.
  • This type of process has the major drawback of requiring the addition of a powerful oxidant as input, such as potassium permanganate, free chlorine or ozone. It will also be noted that it has been proposed in the prior art to use, in difficult cases, directly manganese dioxide in grains as a filtration medium, without input of oxidizing agent.
  • the manganese dioxide grains have a relatively small effective size, of the order of 0.30J mm. These manganese dioxide grains are used in filter beds with sand. They are first present on the surface of the filter bed, but given their small size, they gradually form with the sand a mixed bed likely to eventually have a less effective yield.
  • the invention particularly aims to overcome the disadvantages or shortcomings of the prior art.
  • the invention aims to propose a physicochemical process for treating water which makes it possible to obtain effective elimination of the manganese contained in the water, and this without adding a strong oxidant.
  • Another objective of the invention is to provide such a physicochemical process which implements a filtering material which does not require chemical regeneration, in particular by an oxidant.
  • the invention also aims to provide a process for the treatment of water which causes little or no loss of filter material.
  • Another objective of the invention is to propose such a process which implements a filtering material, coming for example directly from the mining industry, requiring only a simple mechanical treatment prior to its exploitation.
  • Yet another objective of the invention is to provide such a water treatment process that can be implemented on waters having variable and seasonal contents of manganese dissolved in the waters.
  • the invention also aims to propose such a method which is economical and simple to implement.
  • the principle of the invention is therefore based on the use of grains of dioxide whose density and hardness make it possible to retain manganese without adding oxidant, and without having to practice chemical regeneration of the material, using an oxidizing compound.
  • Such a process makes it possible to effectively treat water loaded with manganese using manganese dioxide selected for its characteristics and properties.
  • strong oxidant such as potassium permanganate, free chlorine or ozone is not necessary, either for the reduction of the manganese content of the waters or for the regeneration of the filter material, which is in opposition to current practices.
  • the specificities of density and hardness of the filter material selected according to the invention make it possible to maintain a uniform and stable layer of manganese dioxide, unlike the beds mixed according to the prior techniques. More precisely, the hardness of the material, greater than 6 on the Mosh scale, then makes it possible to maintain the initial particle size and the initial adsorption capacity of this material. As a result, there is a negligible or even zero consumption of manganese dioxide, which gives a particularly advantageous result linked to the fact that the material is not considered to be consumable.
  • the manganese dioxide selected by the Applicant acts as a catalyst, but also as an oxidant. Its mode of action is therefore twofold.
  • the principle of its catalytic action is the same as that of the catalytic effect obtained with manganized sand ("green sand"), the material used to support the adsorption of manganese dissolved in water.
  • Manganese dioxide has an oxidizing action by serving as an oxidant against dissolved manganese present in the water to be treated.
  • this manganese dioxide is not selective with respect to manganese, and also oxidizes ferrous iron, arsenic and selenium.
  • the Mn 2+ and Fe 2+ ions are oxidized by MnO 2 , and are deposited on the surface of the grains of the filtering medium.
  • the overall redox reaction occurring at the surface of the material, at the solid-liquid interface, leads to the formation of manganese sesquioxide Mn 2 O 3 (solid), both by oxidation of the dissolved manganese and by reduction of the solid manganese dioxide.
  • the Mn 2 O 3 thus produced gradually coats the grains of material.
  • said step of regenerating said bed of filtering material is carried out periodically.
  • Such a periodicity of the regeneration step of the dioxide grains may be carried out taking into account in particular the volumes of water treated and seasonal variations in their manganese content.
  • said regeneration step can also be carried out when said bed of filtering material reaches a predetermined pressure drop.
  • Continuous or sampling control of the residual manganese content of the treated water can indicate a pressure drop in the filtration material and lead to a decision to proceed to the regeneration step.
  • the regeneration step makes it possible to maintain the efficiency of the process so as to obtain low residual manganese contents in the treated water.
  • said regeneration step is carried out by simple washing, using a stream of water and / or a gaseous fluid such as air.
  • said washing is carried out against the flow of the water to be treated within said filter bed.
  • Regeneration in a counter-current mode of the flow of water to be treated gives particularly satisfactory results.
  • a regeneration step with a washing fluid, the current of which would be directed in the same direction as that of the flow of the water to be treated is entirely conceivable.
  • said washing is carried out co-current with the flow of the water to be treated within said filter bed.
  • said filtering material comprises at least 70% by weight of MnO 2 equivalent.
  • the manganese dioxide grains have an effective size of 0.8 to 1 mm and a uniformity coefficient of between 1.3 and
  • the effective size corresponds to the mesh opening giving a sieve of 10% and that the coefficient of uniformity is the ratio of the mesh openings corresponding to the sieves of 60% and 10% respectively.
  • the particle size of the manganese dioxide is determined by sieving according to the rules and techniques specified by the standards in force.
  • said manganese dioxide in grains is associated with at least one other material chosen from the following materials: - sand; - anthracite; - granular activated carbon.
  • the method comprises a prior step of crushing and sieving the manganese dioxide, in order to obtain a particle size suitable for the desired filtration.
  • the method comprises an additional step of adjusting the pH of said water, by treatment with air, soda or lime water, upstream of the filtration step.
  • said step consisting in passing said water through at least one bed of filtering material is carried out at atmospheric pressure.
  • this step is carried out under pressure.
  • the process can therefore be implemented both using filters operating at atmospheric pressure and using filters operating under pressure.
  • FIG. 1 illustrates an industrial demanganization unit according to the invention
  • the water is brought through a pipe 1 into the filter 2 which, in this case, is open, that is to say at atmospheric pressure, but which may be of any other type in other embodiments.
  • the water to be treated is thus brought and poured over a filter bed 3, containing 70% by volume of manganese dioxide (MnO 2 ) grains and 30% sand.
  • the manganese dioxide used in bed 3 comes from the mining industry and was obtained after a simple crushing and a sieving operation (according to ISO 2591-1) in order to obtain an effective size ranging from 0.8 at 1 mm, with a uniformity coefficient between 1.3 and 2.5.
  • the manganese dioxide grains used have a density of the order of 4 and a hardness on the Mosh scale greater than 6.
  • the water flows by gravity through the filter bed 3 and is collected at the base of the filter 2, by a pipe 4 for the outlet of the treated water.
  • the waters undergo, if necessary, a pH adjustment step, by an air treatment. This adjustment is made if the pH of the waters to be treated is lower than 7.2.
  • the unit To regenerate the filter material, the unit includes a washing air booster 8 connected to a pipe 9 opening at the base of the filter.
  • washing air is sent to the filter bed 3 against the current of the water to be treated.
  • the washing water is collected by a pipe 10.
  • FIG. 2 and by way of illustration of the results obtained with the method according to the invention implemented with the unit represented by FIG. 1, the evolution of the manganese content of the raw waters and of the waters is shown. treated by a first pilot unit applied to the demanganization of surface water after a coagulation and flocculation stage.
  • the contact time of the water with the filtration bed is of the order of 3 minutes. While the manganese content of the raw water varies between 40 and 410 ⁇ g / 1, the effectiveness of the process can be seen with a residual content of the treated water constantly lower than 10 ⁇ g / 1, ie a reduction of up to 97.5 %.
  • the second pilot unit was applied to dam water, after an aeration step. On the curves shown in Figure 3, we note this time that for variations in the manganese content of the water to be treated ranging from 10 to 270 ⁇ g / 1, the residual contents in the treated water are constantly less than 7 ⁇ g / 1 .
  • the process which has just been described therefore makes it possible to reduce the manganese content of water to be treated which is liable to exhibit significant seasonal variations.
  • the contact time of the water to be treated with the filter material is between 30 seconds and 10 minutes depending on the percentage of reduction required and the desired residual content.
  • the method for using a specific filtration material avoids the use of oxidants both for the filtration step and for the regeneration of the filtration bed.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Inorganic Chemistry (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Removal Of Specific Substances (AREA)
  • Filtering Materials (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention concerns a method for treating water for human consumption, so as to eliminate manganese and possibly other metals comprising steps which consist in: causing said water to pass at least over a bed of filtering material (3) consisting at least partly of manganese dioxide granules, said granules having a real density ranging between 3.5 and 4.5 and a hardness higher than 6 on the Mosh scale; regenerating, if necessary, said manganese dioxide, said regeneration being carried out mechanically.

Description

Procédé de traitement des eaux contenant du manganèse. Process for treating water containing manganese.
La présente invention concerne un procédé de traitement des eaux. Plus précisément, l'invention concerne un procédé de potabilisation des eaux destinées à la consommation humaine, en vue d'en éliminer le manganèse et éventuellement d'autres métaux, tels que le fer ferreux.The present invention relates to a water treatment method. More specifically, the invention relates to a process for the purification of water intended for human consumption, with a view to eliminating manganese and possibly other metals, such as ferrous iron.
Le principe de l'élimination du manganèse repose sur son oxydation et sur la rétention des oxydes insolubles ainsi formés (MnO2, Mn2O3) sur des filtres. L'oxydation à l'oxygène n'étant généralement pas envisageable, l'adjonction d'oxydants forts est nécessaire pour atteindre des potentiels d'oxydo-réduction suffisants. L'oxydant le plus couramment utilisé dans ce cadre est le permanganate.The principle of manganese elimination is based on its oxidation and on the retention of the insoluble oxides thus formed (MnO 2 , Mn 2 O 3 ) on filters. Oxidation with oxygen is generally not possible, the addition of strong oxidants is necessary to achieve sufficient redox potentials. The most commonly used oxidant in this context is permanganate.
Le procédé physico-chimique traditionnel de démanganisation des eaux consiste à oxyder chimiquement le manganèse contenu dans celles-ci à l'aide de permanganate de potassium, de chlore ou d'ozone, puis à les filtrer sur un matériau granulaire tel que, par exemple du sable. Celui-ci peut s'enrober de précipités de bioxyde de manganèse au bout de quelques mois et former ce que l'on appelle un "green sand " naturel. Ce "green sand" peut également être préparé en déposant préalablement un film de bioxyde de manganèse hydraté sur la surface d'un support pouvant être du sable, de l'argile acide, de l'anthracite, de la zéolite, un matériau dolomitique, etc .. Le bioxyde de manganèse est alors considéré comme jouant un rôle de catalyseur.The traditional physico-chemical process of demanganization of water consists in chemically oxidizing the manganese contained in it using potassium permanganate, chlorine or ozone, then filtering it on a granular material such as, for example sand. This can be coated with manganese dioxide precipitates after a few months and form what is called a natural "green sand". This "green sand" can also be prepared by depositing beforehand a film of hydrated manganese dioxide on the surface of a support which may be sand, acid clay, anthracite, zeolite, a dolomitic material, etc. Manganese dioxide is then considered to act as a catalyst.
Ce type de procédé présente l'inconvénient majeur de nécessiter l'ajout en entrée d'un oxydant puissant tel que du permanganate de potassium, du chlore libre ou de l'ozone. On notera aussi qu'il a été proposé dans l'art antérieur d'utiliser, dans les cas difficiles, directement du bioxyde de manganèse en grains comme support de filtration, sans apport en entrée d'agent oxydant.This type of process has the major drawback of requiring the addition of a powerful oxidant as input, such as potassium permanganate, free chlorine or ozone. It will also be noted that it has been proposed in the prior art to use, in difficult cases, directly manganese dioxide in grains as a filtration medium, without input of oxidizing agent.
Toutefois, dans ce cas comme dans les autres, une régénération du matériau filtrant est nécessaire, à l'aide d'un composé fortement oxydant, soit en continu, soit à l'arrêt du système. On notera également que dans ce type de procédé, les grains de bioxyde de manganèse présentent une taille effective relativement faible, de l'ordre de 0,3 0J mm. Ces grains de bioxyde de manganèse sont utilisés dans des lits filtrants avec du sable. Ils sont présents d'abord en surface du lit filtrant mais compte tenu de leur faible taille, ils forment peu à peu avec le sable un lit mélangé susceptible de présenter à terme un rendement moins efficace.However, in this case as in the others, a regeneration of the filtering material is necessary, using a strongly oxidizing compound, either continuously, or when the system stops. It will also be noted that in this type of process, the manganese dioxide grains have a relatively small effective size, of the order of 0.30J mm. These manganese dioxide grains are used in filter beds with sand. They are first present on the surface of the filter bed, but given their small size, they gradually form with the sand a mixed bed likely to eventually have a less effective yield.
L'invention a notamment pour objectif de pallier les inconvénients ou les insuffisances de l'art antérieur.The invention particularly aims to overcome the disadvantages or shortcomings of the prior art.
Plus précisément, l'invention a pour objectif de proposer un procédé physico-chimique de traitement des eaux qui permette d'obtenir une élimination efficace du manganèse contenu dans les eaux, et ce sans ajout d'oxydant puissant.More specifically, the invention aims to propose a physicochemical process for treating water which makes it possible to obtain effective elimination of the manganese contained in the water, and this without adding a strong oxidant.
Un autre objectif de l'invention est de fournir un tel procédé physicochimique qui mette en œuvre un matériau filtrant ne nécessitant pas de régénération chimique, notamment par un oxydant.Another objective of the invention is to provide such a physicochemical process which implements a filtering material which does not require chemical regeneration, in particular by an oxidant.
L'invention a aussi pour objectif de fournir un procédé pour le traitement des eaux qui n'engendre pas ou très peu de perte de matériau filtrant.The invention also aims to provide a process for the treatment of water which causes little or no loss of filter material.
Un autre objectif de l'invention est de proposer un tel procédé qui mette en œuvre un matériau filtrant, provenant par exemple directement de l'industrie minière, ne nécessitant qu'un simple traitement mécanique préalablement à son exploitation.Another objective of the invention is to propose such a process which implements a filtering material, coming for example directly from the mining industry, requiring only a simple mechanical treatment prior to its exploitation.
Encore un autre objectif de l'invention est de fournir un tel procédé de traitement des eaux pouvant être mis en œuvre sur des eaux présentant des teneurs variables et saisonnières de manganèse dissout dans les eaux. L'invention a également pour objectif de proposer un tel procédé qui soit économique et simple de mise en œuvre.Yet another objective of the invention is to provide such a water treatment process that can be implemented on waters having variable and seasonal contents of manganese dissolved in the waters. The invention also aims to propose such a method which is economical and simple to implement.
Ces objectifs, ainsi que d'autres qui apparaîtront par la suite sont atteints à l'aide d'un procédé de traitement des eaux en vue d'abattre notamment leur teneur en manganèse, et le cas échéant leur teneur en fer, caractérisé en ce qu'il comprend les étapes consistant : - à faire transiter lesdites eaux sur au moins un lit de matériau filtrant (3) constitué au moins en partie de grains de bioxyde de manganèse, lesdits grains ayant une densité réelle comprise entreThese objectives, as well as others which will appear subsequently, are achieved using a water treatment process with a view to reducing in particular their manganese content, and where appropriate their iron content, characterized in that that it includes the steps of: - passing said water through at least one bed of filter material (3) made up at least in part of manganese dioxide grains, said grains having an actual density of between
3,5 et 4,5 et une dureté supérieure à 6 sur l'échelle de Mosh ; - à régénérer, lorsque cela est nécessaire, ledit bioxyde de manganèse, ladite régénération étant effectuée mécaniquement.3.5 and 4.5 and a hardness greater than 6 on the Mosh scale; - regenerating, when necessary, said manganese dioxide, said regeneration being carried out mechanically.
Le principe de l'invention est donc basé sur l'utilisation de grains de bioxyde dont la densité et la dureté permettent de retenir le manganèse sans ajout d'oxydant, et sans devoir pratiquer une régénération chimique du matériau, à l'aide d'un composé oxydant.The principle of the invention is therefore based on the use of grains of dioxide whose density and hardness make it possible to retain manganese without adding oxidant, and without having to practice chemical regeneration of the material, using an oxidizing compound.
Un tel procédé permet de traiter efficacement des eaux chargées en manganèse à l'aide de bioxyde de manganèse sélectionné pour ses caractéristiques et propriétés. L'ajout d'oxydant fort, tel que le permanganate de potassium, le chlore libre ou l'ozone n'est pas nécessaire, que ce soit pour l'abattement de la teneur en manganèse des eaux ou pour la régénération du matériau filtrant, ce qui est en opposition aux pratiques courantes.Such a process makes it possible to effectively treat water loaded with manganese using manganese dioxide selected for its characteristics and properties. The addition of strong oxidant, such as potassium permanganate, free chlorine or ozone is not necessary, either for the reduction of the manganese content of the waters or for the regeneration of the filter material, which is in opposition to current practices.
Les spécificités de densité et de dureté du matériau filtrant sélectionné selon l'invention permettent de maintenir une couche uniforme et stable de dioxyde de manganèse, à l'inverse des lits mélangés selon les techniques antérieures. Plus précisément, la dureté du matériau, supérieure à 6 sur l'échelle de Mosh, permet alors le maintien de la granulométrie initiale et la capacité d'adsorption initiale de ce matériau. De ce fait, on constate une consommation négligeable voire nulle du bioxyde de manganèse, ce qui procure un résultat particulièrement avantageux lié au fait que le matériau n'est pas considéré comme un consommable.The specificities of density and hardness of the filter material selected according to the invention make it possible to maintain a uniform and stable layer of manganese dioxide, unlike the beds mixed according to the prior techniques. More precisely, the hardness of the material, greater than 6 on the Mosh scale, then makes it possible to maintain the initial particle size and the initial adsorption capacity of this material. As a result, there is a negligible or even zero consumption of manganese dioxide, which gives a particularly advantageous result linked to the fact that the material is not considered to be consumable.
Selon une caractéristique remarquable du bioxyde de manganèse sélectionné par la Demanderesse, celui-ci agit comme un catalyseur, mais également comme un oxydant. Son mode d'action est donc double. Le principe de son action catalytique est le même que celui de l'effet catalytique obtenu avec un sable manganisé ("green sand"), le matériau servant de support à l'adsorption du manganèse dissout dans les eaux.According to a remarkable characteristic of the manganese dioxide selected by the Applicant, it acts as a catalyst, but also as an oxidant. Its mode of action is therefore twofold. The principle of its catalytic action is the same as that of the catalytic effect obtained with manganized sand ("green sand"), the material used to support the adsorption of manganese dissolved in water.
Le bioxyde de manganèse a une action oxydante en servant d'oxydant vis- à- vis du manganèse dissout présent dans l'eau à traiter.Manganese dioxide has an oxidizing action by serving as an oxidant against dissolved manganese present in the water to be treated.
On notera en outre que ce bioxyde de manganèse n'est pas sélectif vis-à- vis du manganèse, et oxyde également le fer ferreux, l'arsenic et le sélénium. Les ions Mn2+ et Fe2+ sont oxydés par MnO2, et sont déposés à la surface des grains du milieu filtrant. La réaction globale d'oxydoréduction se produisant à la surface du matériau, à l'interface solide-liquide, conduit à la formation de sesquioxyde de manganèse Mn2O3 (solide), à la fois par oxydation du manganèse dissous et par réduction du bioxyde de manganèse solide. Le Mn2O3 ainsi produit enrobe progressivement les grains de matériau. Selon un mode de réalisation de l'invention, ladite étape de régénération dudit lit de matériau filtrant est réalisée périodiquement.It will also be noted that this manganese dioxide is not selective with respect to manganese, and also oxidizes ferrous iron, arsenic and selenium. The Mn 2+ and Fe 2+ ions are oxidized by MnO 2 , and are deposited on the surface of the grains of the filtering medium. The overall redox reaction occurring at the surface of the material, at the solid-liquid interface, leads to the formation of manganese sesquioxide Mn 2 O 3 (solid), both by oxidation of the dissolved manganese and by reduction of the solid manganese dioxide. The Mn 2 O 3 thus produced gradually coats the grains of material. According to one embodiment of the invention, said step of regenerating said bed of filtering material is carried out periodically.
Une telle périodicité de l'étape de régénération des grains de bioxyde pourra être effectué en tenant compte notamment des volumes d'eau traités et des variations saisonnières de leur teneur en manganèse. Selon un autre mode de réalisation, ladite étape de régénération pourra aussi être réalisée lorsque ledit lit de matériau filtrant atteindra une perte de charge prédéterminée.Such a periodicity of the regeneration step of the dioxide grains may be carried out taking into account in particular the volumes of water treated and seasonal variations in their manganese content. According to another embodiment, said regeneration step can also be carried out when said bed of filtering material reaches a predetermined pressure drop.
Le contrôle continu ou par échantillonnage de la teneur résiduelle en manganèse des eaux traitées peut indiquer une perte de charge du matériau de filtration et entraîner une décision de procéder à l'étape de régénération.Continuous or sampling control of the residual manganese content of the treated water can indicate a pressure drop in the filtration material and lead to a decision to proceed to the regeneration step.
Dans l'un ou l'autre cas, l'étape de régénération permet de maintenir l'efficacité du procédé de façon à obtenir des teneurs résiduelles faibles en manganèse dans les eaux traitées. Selon un mode de réalisation préférentiel de l'invention, ladite étape de régénération est effectuée par simple lavage, à l'aide d'un courant d'eau et/ou d'un fluide gazeux tel que l'air.In either case, the regeneration step makes it possible to maintain the efficiency of the process so as to obtain low residual manganese contents in the treated water. According to a preferred embodiment of the invention, said regeneration step is carried out by simple washing, using a stream of water and / or a gaseous fluid such as air.
Cette solution s'avère particulièrement simple et économique par rapport à l'art antérieur qui nécessite toujours l'utilisation de composés oxydants pour régénérer le matériau de filtration. Sans ajout de réactif, la régénération par lavage selon l'invention permet d'éliminer progressivement l'enrobage formé et de retrouver le grain initial de MnO2.This solution proves to be particularly simple and economical compared to the prior art which always requires the use of oxidizing compounds to regenerate the filtration material. Without adding any reagent, the regeneration by washing according to the invention makes it possible to gradually eliminate the coating formed and to find the initial grain of MnO 2 .
Avantageusement, ledit lavage est effectué à contre-courant de l'écoulement de l'eau à traiter au sein dudit lit filtrant.Advantageously, said washing is carried out against the flow of the water to be treated within said filter bed.
La régénération selon un mode à contre-courant de l'écoulement des eaux à traiter donne des résultats particulièrement satisfaisant. Toutefois, une étape de régénération avec un fluide de lavage dont le courant serait orienté dans le même sens que celui de l'écoulement des eaux à traiter est tout à fait envisageable. Aussi, selon un autre mode de réalisation, ledit lavage est effectué à co- courant de l'écoulement de l'eau à traiter au sein dudit lit filtrant.Regeneration in a counter-current mode of the flow of water to be treated gives particularly satisfactory results. However, a regeneration step with a washing fluid, the current of which would be directed in the same direction as that of the flow of the water to be treated, is entirely conceivable. Also, according to another embodiment, said washing is carried out co-current with the flow of the water to be treated within said filter bed.
Préférentiellement, ledit matériau filtrant comprend au moins 70 % en poids d'équivalent MnO2.Preferably, said filtering material comprises at least 70% by weight of MnO 2 equivalent.
Avantageusement, les grains de bioxyde de manganèse présentent une taille effective de 0,8 à 1 mm et un coefficient d'uniformité compris entre 1,3 etAdvantageously, the manganese dioxide grains have an effective size of 0.8 to 1 mm and a uniformity coefficient of between 1.3 and
2,5. On rappelle que la taille effective correspond à l'ouverture de maille donnant un tamisât de 10 % et que le coefficient d'uniformité est le rapport des ouvertures de mailles correspondant respectivement aux tamisats de 60 % et de 10 %. La granulométrie du bioxyde de manganèse est déterminée en tamisant selon les règles et techniques spécifiées par les normes en vigueur.2.5. It will be recalled that the effective size corresponds to the mesh opening giving a sieve of 10% and that the coefficient of uniformity is the ratio of the mesh openings corresponding to the sieves of 60% and 10% respectively. The particle size of the manganese dioxide is determined by sieving according to the rules and techniques specified by the standards in force.
Selon une solution préférée, ledit bioxyde de manganèse en grains est associé à au moins un autre matériau choisi parmi les matériaux suivants : - sable ; - anthracite ; - charbon actif en grains.According to a preferred solution, said manganese dioxide in grains is associated with at least one other material chosen from the following materials: - sand; - anthracite; - granular activated carbon.
Selon une solution avantageuse, le procédé comprend une étape préalable de concassage et de tamisage du bioxyde de manganèse, en vue d'obtenir une granulométrie adaptée à la filtration recherchée. Préférentiellement, le procédé comprend une étape supplémentaire d'ajustement du pH desdites eaux, par un traitement à l'air, à la soude ou à l'eau de chaux , en amont de l'étape de filtration.According to an advantageous solution, the method comprises a prior step of crushing and sieving the manganese dioxide, in order to obtain a particle size suitable for the desired filtration. Preferably, the method comprises an additional step of adjusting the pH of said water, by treatment with air, soda or lime water, upstream of the filtration step.
Selon un mode de réalisation, ladite étape consistant à faire transiter lesdites eaux sur au moins un lit de matériau filtrant est effectuée à la pression atmosphérique.According to one embodiment, said step consisting in passing said water through at least one bed of filtering material is carried out at atmospheric pressure.
Selon un autre mode de réalisation, cette étape est effectuée sous pression.According to another embodiment, this step is carried out under pressure.
Le procédé peut donc être mis en œuvre tant à l'aide des filtres fonctionnant à la pression atmosphérique qu'à l'aide des filtres fonctionnant sous pression.The process can therefore be implemented both using filters operating at atmospheric pressure and using filters operating under pressure.
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante de deux modes de réalisation préférentiels de l'invention, donnés à titre d'exemples illustratifs et non limitatifs, et des dessins annexés parmi lesquels : - la figure 1 illustre une unité industrielle de démanganisation selon l'inventionOther characteristics and advantages of the invention will appear more clearly on reading the following description of two preferred embodiments of the invention, given by way of illustrative and nonlimiting examples, and of the appended drawings among which: - FIG. 1 illustrates an industrial demanganization unit according to the invention
- les figures 2 et 3 représentent des courbes de démanganisation obtenues avec le procédé selon l'invention.- Figures 2 and 3 show itching curves obtained with the method according to the invention.
Dans l'unité industrielle de traitement des eaux illustrée schématiquement par la figure 1, les eaux sont amenées par une conduite 1 dans le filtre 2 qui, dans le cas présent, est ouvert, c'est-à-dire à la pression atmosphérique, mais qui pourra être de tout autre type dans d'autres modes de réalisation.In the industrial water treatment unit illustrated diagrammatically in FIG. 1, the water is brought through a pipe 1 into the filter 2 which, in this case, is open, that is to say at atmospheric pressure, but which may be of any other type in other embodiments.
Les eaux à traiter sont ainsi amenées et déversées au-dessus d'un lit filtrant 3, contenant 70% en volume de grains de bioxyde de manganèse (MnO2) et 30% de sable. Le bioxyde de manganèse utilisé dans le lit 3 provient de l'industrie minière et a été obtenu après un simple concassage et une opération de tamisage (selon la norme ISO 2591-1) en vue d'obtenir une taille effective allant de 0,8 à 1 mm, avec un coefficient d'uniformité compris entre 1,3 et 2,5. Selon l'invention, les grains de bioxyde de manganèse utilisés ont une densité de l'ordre de 4 et une dureté sur l'échelle de Mosh supérieure à 6.The water to be treated is thus brought and poured over a filter bed 3, containing 70% by volume of manganese dioxide (MnO 2 ) grains and 30% sand. The manganese dioxide used in bed 3 comes from the mining industry and was obtained after a simple crushing and a sieving operation (according to ISO 2591-1) in order to obtain an effective size ranging from 0.8 at 1 mm, with a uniformity coefficient between 1.3 and 2.5. According to the invention, the manganese dioxide grains used have a density of the order of 4 and a hardness on the Mosh scale greater than 6.
Dans le cas du filtre ouvert tel que représenté à la figure 1, les eaux s'écoulent par gravité au travers du lit filtrant 3 et sont recueillies à la base du filtre 2, par une conduite 4 de sortie des eaux traitées. En amont de la filtration, les eaux subissent, si nécessaire, une étape d'ajustement du pH, par un traitement à l'air On procède à cet ajustement si le pH des eaux à traiter est inférieur à 7,2.In the case of the open filter as shown in FIG. 1, the water flows by gravity through the filter bed 3 and is collected at the base of the filter 2, by a pipe 4 for the outlet of the treated water. Upstream of filtration, the waters undergo, if necessary, a pH adjustment step, by an air treatment. This adjustment is made if the pH of the waters to be treated is lower than 7.2.
Afin d'éliminer l'enrobage de Mn2O3 formé au cours de la filtration autour des grains du lit 3 et pour retrouver ainsi le grain initial de MnO2, un simple lavage mécanique est opéré à l'aide d'un fluide gazeux, en l'occurrence de l'air.In order to eliminate the coating of Mn 2 O 3 formed during the filtration around the grains of bed 3 and thus to find the initial grain of MnO 2 , a simple mechanical washing is carried out using a gaseous fluid , in this case air.
On notera que selon une caractéristique de l'invention, et a contrario de l'art antérieur, aucun ajout de réactif oxydant n'est nécessaire pour procéder à cette régénération.It will be noted that according to a characteristic of the invention, and in contrast to the prior art, no addition of oxidizing reagent is necessary to carry out this regeneration.
Pour procéder à la régénération du matériau filtrant, l'unité comprend un surpresseur d'air de lavage 8 relié à une conduite 9 débouchant à la base du filtre.To regenerate the filter material, the unit includes a washing air booster 8 connected to a pipe 9 opening at the base of the filter.
De cette façon, l'air de lavage est envoyé dans le lit filtrant 3 à contre- courant des eaux à traiter. Les eaux de lavage sont recueillies par une conduite 10.In this way, the washing air is sent to the filter bed 3 against the current of the water to be treated. The washing water is collected by a pipe 10.
Sur la figure 2 et à titre d'illustration des résultats obtenus avec le procédé selon l'invention mis en œuvre avec l'unité représenté par la figure 1, on a représenté l'évolution de la teneur en manganèse des eaux brutes et des eaux traitées par une première unité pilote appliquée à la démanganisation d'une eau de surface après un étage de coagulation et de floculation.In FIG. 2 and by way of illustration of the results obtained with the method according to the invention implemented with the unit represented by FIG. 1, the evolution of the manganese content of the raw waters and of the waters is shown. treated by a first pilot unit applied to the demanganization of surface water after a coagulation and flocculation stage.
Dans cette unité le temps de contact des eaux avec le lit de filtration est de l'ordre de 3 minutes. Tandis que la teneur en manganèse des eaux brutes varie entre 40 et 410 μg/1, on constate l'efficacité du procédé avec une teneur résiduelle des eaux traitées constamment inférieure à 10 μg/1, soit un abattement allant jusqu'à 97,5%. La deuxième unité pilote a été appliquée à des eaux de barrage, après une étape d'aération. Sur les courbes représentées sur la figure 3, on remarque cette fois que pour des variations de la teneur en manganèse des eaux à traiter allant de 10 à 270 μg/1, les teneurs résiduelles dans les eaux traitées sont constamment inférieures à 7 μg/1. Le procédé qui vient d'être décrit permet donc d'abattre la teneur en manganèse d'eaux à traiter susceptibles de présenter des variations saisonnières importantes.In this unit, the contact time of the water with the filtration bed is of the order of 3 minutes. While the manganese content of the raw water varies between 40 and 410 μg / 1, the effectiveness of the process can be seen with a residual content of the treated water constantly lower than 10 μg / 1, ie a reduction of up to 97.5 %. The second pilot unit was applied to dam water, after an aeration step. On the curves shown in Figure 3, we note this time that for variations in the manganese content of the water to be treated ranging from 10 to 270 μg / 1, the residual contents in the treated water are constantly less than 7 μg / 1 . The process which has just been described therefore makes it possible to reduce the manganese content of water to be treated which is liable to exhibit significant seasonal variations.
Le temps de contact de l'eau à traiter avec le matériau filtrant est compris entre 30 secondes et 10 minutes en fonction du pourcentage d'abattement requis et de la teneur résiduelle recherchée.The contact time of the water to be treated with the filter material is between 30 seconds and 10 minutes depending on the percentage of reduction required and the desired residual content.
Avec des résultats au moins équivalents voire supérieurs aux techniques antérieures, le procédé pour la mise en œuvre d'un matériau de filtration spécifique, évite le recours aux oxydants tant pour l'étape de filtration que pour la régénération du lit de filtration. With results at least equivalent or even superior to prior techniques, the method for using a specific filtration material avoids the use of oxidants both for the filtration step and for the regeneration of the filtration bed.

Claims

REVENDICATIONS
1. Procédé de traitement des eaux en vue d'abattre notamment leur teneur en manganèse, et le cas échéant leur teneur en fer, caractérisé en ce qu'il comprend les étapes consistant : - à faire transiter lesdites eaux sur au moins un lit de matériau filtrant (3) constitué au moins en partie de grains de bioxyde de manganèse, lesdits grains ayant une densité réelle comprise entre 3,5 et 4,5 et une dureté supérieure à 6 sur l'échelle de Mosh ; - à régénérer, lorsque cela est nécessaire, ledit bioxyde de manganèse, ladite régénération étant effectuée mécaniquement.1. Process for treating water with a view to slaughtering, in particular, its manganese content, and where appropriate its iron content, characterized in that it comprises the stages consisting in: - passing said water over at least one bed of filter material (3) consisting at least in part of manganese dioxide grains, said grains having an actual density between 3.5 and 4.5 and a hardness greater than 6 on the Mosh scale; - regenerating, when necessary, said manganese dioxide, said regeneration being carried out mechanically.
2. Procédé de traitement des eaux selon la revendication 1, caractérisé en ce que ladite étape de régénération dudit lit de matériau filtrant (3) est réalisée périodiquement.2. A method of treating water according to claim 1, characterized in that said step of regenerating said bed of filter material (3) is carried out periodically.
3. Procédé de traitement des eaux selon la revendication 1, caractérisé en ce que ladite étape de régénération est réalisée lorsque ledit lit de matériau filtrant (3) atteint une perte de charge prédéterminée.3. A method of treating water according to claim 1, characterized in that said regeneration step is carried out when said bed of filter material (3) reaches a predetermined pressure drop.
4. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite étape de régénération est effectuée par simple lavage, à l'aide d'un courant d'eau et/ou d'un fluide gazeux tel que l'air. 4. Water treatment method according to any one of claims 1 to 3, characterized in that said regeneration step is carried out by simple washing, using a stream of water and / or a fluid gaseous such as air.
5. Procédé de traitement des eaux selon la revendication 4, caractérisé en ce que ledit lavage est effectué à contre-courant de l'écoulement de l'eau à traiter au sein dudit lit filtrant (3).5. A method of water treatment according to claim 4, characterized in that said washing is carried out against the flow of the water to be treated within said filter bed (3).
6. Procédé de traitement des eaux selon la revendication 4, caractérisé en ce que ledit lavage est effectué à co-courant de l'écoulement de l'eau à traiter au sein dudit lit filtrant (3).6. Water treatment method according to claim 4, characterized in that said washing is carried out co-current with the flow of water to be treated within said filter bed (3).
7. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit matériau filtrant comprend au moins 70 % en poids d'équivalent MnO2 7. A method of water treatment according to any one of claims 1 to 6, characterized in that said filtering material comprises at least 70% by weight of MnO 2 equivalent.
8. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les grains de bioxyde de manganèse présentent une taille effective de 0,8 à 1mm et un coefficient d'uniformité compris entre 1,3 et 2,5.8. A method of water treatment according to any one of claims 1 to 7, characterized in that the grains of manganese dioxide have a effective size from 0.8 to 1mm and a uniformity coefficient between 1.3 and 2.5.
9. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ledit bioxyde de manganèse en grains est associé à au moins un autre matériau choisi parmi les matériaux suivants :9. A method of treating water according to any one of claims 1 to 8, characterized in that said manganese dioxide in grains is associated with at least one other material chosen from the following materials:
- sable ;- sand;
- anthracite ;- anthracite;
- charbon actif en grains.- granular activated carbon.
10. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'il comprend une étape préalable de concassage et de tamisage du bioxyde de manganèse, en vue d'obtenir une granulométrie adaptée à la filtration recherchée.10. Water treatment method according to any one of claims 1 to 9, characterized in that it comprises a prior step of crushing and sieving of manganese dioxide, in order to obtain a particle size suitable for the desired filtration. .
11. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 10, caractérisé en ce qu'il comprend une étape supplémentaire d'ajustement du pH desdites eaux, par un traitement à l'air, à la soude ou à l'eau de chaux , en amont de l'étape de filtration.11. A method of treating water according to any one of claims 1 to 10, characterized in that it comprises an additional step of adjusting the pH of said water, by treatment with air, soda or l lime water, upstream of the filtration stage.
12. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 11, caractérisé en ce que ladite étape consistant à faire transiter lesdites eaux sur au moins un lit de matériau filtrant est effectuée à la pression atmosphérique. 12. A method of treating water according to any one of claims 1 to 11, characterized in that said step consisting in passing said water through at least one bed of filtering material is carried out at atmospheric pressure.
13. Procédé de traitement des eaux selon l'une quelconque des revendications 1 à 11, caractérisé en ce ladite étape consistant à faire transiter lesdites eaux sur au moins un lit de matériau filtrant est effectuée sous pression. 13. A method of treating water according to any one of claims 1 to 11, characterized in that said step consisting in passing said water through at least one bed of filter material is carried out under pressure.
14. Procédé de traitement des eaux selon l'une quelconques des revendications 1 à 13, caractérisé en ce que ladite étape consistant à faire transiter lesdites eaux sur au moins un lit de matériau filtrant est effectuée avec un temps de contact allant de 30 secondes à 10 minutes. 14. A method of treating water according to any one of claims 1 to 13, characterized in that said step consisting in passing said water through at least one bed of filtering material is carried out with a contact time ranging from 30 seconds to 10 minutes.
EP01993589A 2000-11-07 2001-11-06 Method for treating water containing manganese Withdrawn EP1343730A1 (en)

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FR0014295A FR2816304B1 (en) 2000-11-07 2000-11-07 MANGANESE-CONTAINING WATER TREATMENT PROCESS
PCT/FR2001/003441 WO2002038511A1 (en) 2000-11-07 2001-11-06 Method for treating water containing manganese

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