WO2019130635A1 - Procédé et système de traitement de l'eau - Google Patents

Procédé et système de traitement de l'eau Download PDF

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Publication number
WO2019130635A1
WO2019130635A1 PCT/JP2018/028680 JP2018028680W WO2019130635A1 WO 2019130635 A1 WO2019130635 A1 WO 2019130635A1 JP 2018028680 W JP2018028680 W JP 2018028680W WO 2019130635 A1 WO2019130635 A1 WO 2019130635A1
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Prior art keywords
water
polymer flocculant
treated
mol
cationic polymer
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PCT/JP2018/028680
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English (en)
Japanese (ja)
Inventor
涼 檜垣
臨太郎 前田
鳥羽　裕一郎
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オルガノ株式会社
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Publication of WO2019130635A1 publication Critical patent/WO2019130635A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • 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

Definitions

  • the present invention relates to a water treatment method and apparatus by coagulation sedimentation.
  • Coagulative precipitation is widely used as one of the unit operations in water treatment.
  • a flocculant such as an inorganic flocculant or a polymer flocculant is added to the suspension water containing the suspended matter, and the suspended matter is flocculated by appropriately stirring, thereby forming an aggregate (" Form a flocculated floc). Then, the aggregate is precipitated and solid-liquid separated from the suspension water to obtain clear treated water.
  • the sludge blanket method is known as one of such aggregation precipitation methods.
  • a suspended and packed layer of aggregates ie, a sludge blanket
  • the fine suspended matter in the suspension water is separated by filtration by flowing into and through the sludge blanket.
  • Patent Document 1 discloses, among the sludge blanket methods, a technique related to a method of performing stirring and granulation in a coagulation sedimentation tank.
  • a cationic polymer flocculant is added to the suspension water, and then an anionic polymer flocculant is added to form, stir and granulate aggregates in the flocculation settling tank, solid-liquid separation It has been described that.
  • high-density spherical aggregates (pellets) are formed by the crosslinking action of the anionic polymer flocculant and the cationic polymer flocculant and the mechanical dewatering action by the stirring in the sedimentation tank.
  • the sedimentation of the pellets is much higher than that of conventional flocculated flocs, and forming the sludge blanket from the pellets enables processing at a higher linear velocity (LV) than that of the conventional sludge blanket method. Therefore, the water area load can be increased compared to the conventional sludge blanket method, and the settling tank can be more compact.
  • the sludge blanket formed of the pellet may be called a pellet blanket.
  • Patent Document 2 the pH of the purified waste sludge is adjusted to an alkaline region, an inorganic flocculant is mixed, and an anionic polymer is added and stirred in a high-speed granulation precipitation concentration tank to form a highly granulated product.
  • a method is disclosed.
  • the interface of the sludge blanket disperses, and the flocculated floc forming the sludge blanket is treated water And the quality of the treated water may deteriorate.
  • An object of the present invention is to provide an anionic polymer by adding a cationic polymer flocculant and an anionic polymer flocculant in this order in a water treatment method in which metal ion-containing water is subjected to alkaline aggregation precipitation at pH 8 or more. It is an object of the present invention to provide a water treatment method capable of obtaining clearer treated water as compared with the case of adding only a flocculant.
  • Another object of the present invention is to provide a water treatment device suitable for carrying out such a water treatment method.
  • a water treatment method comprising:
  • Alkali addition means for adding an alkali to the water to be treated containing metal ions;
  • a cationic polymer flocculant addition unit which is provided downstream of the alkali addition unit, adds a cationic polymer flocculant having a cation group ratio of 30 mol% or less to the water to be treated;
  • Anionic polymer flocculant addition means provided downstream of the cationic polymer flocculant addition means for adding an anionic polymer flocculant having an anion group ratio of 10 mol% or more to the water to be treated;
  • a sludge blanket and a layer of clear water are formed from treated water provided downstream of the anionic polymer flocculant addition means, treated water is obtained from the layer of clear water, and sludge is obtained from the sludge blanket , Sludge blanket type sedimentation tank,
  • a water treatment device comprising
  • an anionic polymer is obtained by adding a cationic polymer flocculant and an anionic polymer flocculant in this order. It is possible to provide a water treatment method capable of obtaining clearer treated water as compared with the case of adding only the flocculant.
  • FIG. 1 It is a figure which shows schematic structure of an example of the water treatment apparatus which concerns on this invention. It is a graph which shows the relationship between the cation group ratio of a cationic polymer flocculent, and the suspended matter (SS) density
  • the water treatment method according to the present invention comprises steps i to iii.
  • step i a metal hydroxide is precipitated as a suspended substance at a pH of 8 or more by adding an alkali to the metal ion-containing treated water, that is, raw water.
  • step ii after adding a cationic polymer flocculant to the water to be treated obtained from step i, an aggregate of the suspended matter is formed by adding an anionic polymer flocculant. Stirring may be carried out as appropriate or simultaneously with the addition of the respective polymeric flocculants.
  • a cationic polymer flocculant having a cation group ratio of 30 mol% or less, preferably 15 mol% or less, more preferably 8 mol% or less is used.
  • the cationic group ratio can be 3 mol% or more.
  • an anionic polymer flocculant having an anionic group ratio of 10 mol% or more is added. This makes it possible to form better aggregates, is easy to process with high LV, and it is easy to obtain a clearer treated water.
  • the anionic group ratio can be, for example, 50 mol% or less, further 45 mol% or less, and specifically 41 mol% or less.
  • a sludge blanket and a layer of clear water are formed from the water to be treated obtained from step ii.
  • Treated water is obtained from the layer of clear water.
  • sludge can be obtained from a sludge blanket.
  • the aggregates can be further concentrated by sedimentation and the concentrated aggregates can be discharged as sludge.
  • Raw water to be treated in the present invention is water containing metal ions.
  • water containing metal ions that form insoluble metal hydroxides at a pH of 8 or more can be used.
  • the metal is, for example, zinc, nickel, cobalt, iron, copper, lead, cadmium, manganese and the like.
  • drainage such as plating drainage of a plating plant, flue gas desulfurization drainage of a power generation plant, and flushing drainage of a waste incineration plant can be mentioned. If metal ions in waste water are low (for example, 10 mg / L or less) or if substances other than metal ions are to be removed, perform aggregation treatment by adding an inorganic coagulant as necessary. May be
  • alkali to be added in step i alkalis known in the field of flocculation and precipitation such as caustic soda, slaked lime, sodium carbonate and the like can be used.
  • the waste water may contain an organic acid such as citric acid, and a compound which forms a complex such as EDTA (ethylenediaminetetraacetic acid) or ammonia.
  • an iron salt such as ferric chloride may be added to carry out alkaline aggregation and precipitation, whereby the complex forming compound may be effectively removed.
  • aluminum salts such as PAC (polyaluminum chloride) and sulfate bands can also be used, but in the case of aluminum salts, since the aggregation pH is in the neutral region of 6.0 to 8.5, It is preferable to use an iron salt capable of aggregating even in the alkaline region.
  • the cationic polymer flocculant having a cationic group ratio of 30 mol% or less comprises a copolymer of a cationic monomer and a nonionic monomer. And the ratio of the cationic monomer among the cationic monomer and the nonionic monomer which comprises this copolymer, ie, a cation group ratio, is 30 mol% or less.
  • the cationic monomer include dimethylaminoethyl acrylate / methyl chloride quaternary salt (DAA) and dimethylaminoethyl methacrylate methyl chloride quaternary salt (DAM).
  • DAA dimethylaminoethyl acrylate / methyl chloride quaternary salt
  • DAM dimethylaminoethyl methacrylate methyl chloride quaternary salt
  • acrylamide can be mentioned, for example.
  • the weight average molecular weight of the cationic polymer flocculant can be, for example, 7,000,000 or more or 10,000,000 or more, and can be 15,000,000 or less. Generally, the larger the molecular weight, the better the flocculating ability, but since the optimum molecular weight also differs depending on the type of waste water and the type of sludge dewatering, it is better to select each case accordingly.
  • the amount of the cationic polymer flocculant added to the water to be treated is preferably, for example, 0.3 to 10 mg / L.
  • the addition amount may be more than 10 mg / L, but in that case, the effect of increasing the particle size of the aggregate (pellets) with respect to the increase of the addition amount is small. Further, by setting the addition amount to 10 mg / L or less, it is possible to easily prevent the influence on the post-stage equipment, for example, the blockage of the membrane filtration equipment and the decrease in the sludge removability after dehydration.
  • the cationic polymer flocculant is preferably added to the water to be treated in the form of a solution previously dissolved in water.
  • concentration of the cationic polymer flocculant in the solution is, for example, 0.05 to 0.3 w / v%.
  • the anionic polymer flocculant As the anionic polymer flocculant, those known in the field of flocculation and precipitation can be appropriately used.
  • the anionic polymer flocculant is preferably a medium to strong anion polymer flocculant which functions particularly effectively as a flocculant in the alkaline region. Specifically, an anionic polymer flocculant having an anionic group ratio of 10 mol% or more is used.
  • anionic polymer flocculant one comprising a copolymer of an anionic monomer and a nonionic monomer can be used.
  • the anionic monomer is, for example, acrylic acid.
  • the nonionic monomer is, for example, acrylamide.
  • the weight average molecular weight of the anionic polymer flocculant can be, for example, 10,000,000 or more, or 15,000,000 or more, and can be 25,000,000 or less.
  • the larger the molecular weight the better the aggregation ability.
  • the optimum molecular weight varies depending on the type of drainage and sludge dewatering model, it is better to select each time according to them.
  • the amount of the anionic polymer flocculant added to the water to be treated is preferably, for example, 0.3 to 10 mg / L.
  • the addition amount is 0.3 mg / L or more, it is easy to increase the aggregate (which may be a pellet).
  • the addition amount may be more than 10 mg / L, but in that case, the effect of increasing the particle size of the aggregate with respect to the increase of the addition amount is small. Further, by setting the addition amount to 10 mg / L or less, it is possible to easily prevent the influence on the post-stage equipment, for example, the blockage of the membrane filtration equipment and the decrease in the sludge removability after dehydration.
  • the anionic polymer flocculant is preferably added to the water to be treated in the form of a solution previously dissolved in water.
  • the concentration of the anionic polymer flocculant in the solution is 0.05 to 0.3 w / v%.
  • the anionic polymer flocculant comprises a copolymer of an anionic monomer and a nonionic monomer
  • the anionic group ratio is an anionic monomer among the anionic monomer and the nonionic monomer constituting this copolymer. Means the percentage of
  • the aggregates are retained in the sedimentation tank to form a sludge blanket which is a floating and dense layer of the aggregates, and the aggregates (typically fine flocs) and suspended matter (flowing in later)
  • a sludge blanket type settling tank that captures SS
  • the treated water containing the aggregates flows upward, the settling speed of the aggregates and the rising speed of the treated water are balanced, and the aggregates are densely floated.
  • the sludge blanket type settling tanks it is also possible to use, in particular, a granulated settling tank in which the sludge blanket is stirred to perform granulation (the pellet blanket is formed).
  • sludge blanket type sedimentation tank those known in the field of coagulated sedimentation can be appropriately used.
  • a water treatment apparatus includes an alkali addition means, a cationic polymer flocculant addition means, an anionic polymer flocculant addition means, and a sludge blanket type precipitation tank.
  • An alkali addition means is comprised so that an alkali may be added to the to-be-processed water containing a metal ion.
  • the cationic polymer flocculant addition means is provided downstream of the alkali addition means, and is configured to add a cationic polymer flocculant having a cation group ratio of 30 mol% or less to the water to be treated.
  • the anionic polymer coagulant addition means is provided downstream of the cationic polymer coagulant addition means, and is configured to add an anionic polymer coagulant having an anion group ratio of 10 mol% or more to the water to be treated. Ru.
  • the sludge blanket type sedimentation tank is provided downstream of the anionic polymer flocculant addition means, and forms a sludge blanket and a layer of clear water from the water to be treated, and obtains treated water from the layer of the clear water, It is configured to obtain sludge from a sludge blanket.
  • downstream means downstream with respect to the flow of treated water.
  • FIG. 1 An example of a water treatment device is shown in FIG.
  • This water treatment device can be referred to in detail as a “flocculating and settling device” and is hereinafter referred to as a “flocculating and settling device”.
  • the coagulation / sedimentation apparatus comprises a primary water tank 10 for aeration of raw water and pH adjustment, a primary flocculation tank 20 for mixing raw water after pH adjustment and a cationic polymer flocculant, and aggregation and granulation operations in the interior. And a settling tank 30 with a stirrer.
  • the settling tank 30 is a sludge blanket type settling tank.
  • Raw water is supplied to the raw water tank 10 from the line L1.
  • caustic soda is added as an alkali to the raw water, and the pH of the resulting treated water is adjusted to 8 or more.
  • the line L7 connected to the raw water tank 10 is used as an alkali addition means. By this pH adjustment, the metal oxide is precipitated and a suspended substance is formed in the water to be treated.
  • the pH of the water to be treated can be measured using a pH meter (indicated by "pH" in the figure) as appropriate.
  • the line L7 does not have to be connected to the raw water tank 10, and may be connected to the line L1, for example.
  • a container (not shown) containing alkali or an aqueous solution thereof can be connected to the line L7.
  • the raw water tank 10 is supplied with air from the blower B through a line L6 in order to aerate the raw water.
  • the to-be-processed water obtained from the raw water tank 10 is sent to the latter stage primary aggregation tank 20 through the line L2.
  • the pump P and the flow meter FI can be provided as appropriate in the line L2.
  • a cationic polymer flocculant having a cation group ratio of 30 mol% or less is added to the water to be treated which has flowed into the primary flocculation tank 20, and the aggregate of the suspended matter, typically a fibrous primary flocculate floe. Is formed.
  • the line L8 connected to the primary coagulation tank 20 is used as a cationic polymer flocculant addition means.
  • stirring can be appropriately performed using a stirring blade 21 in the primary aggregation tank.
  • the line L8 does not have to be connected to the primary aggregation tank 20, and may be connected to the line L2, for example.
  • a container (not shown) that accommodates the cationic polymer flocculant or an aqueous solution thereof can be connected to the line L8.
  • an anionic polymer flocculant is added before the water to be treated flows into the settling tank 30. Is added.
  • the line L9 connected to the line L3 is used as an anionic polymer coagulant addition means.
  • a water tank (not shown) may be provided in the middle of the line L3, and the line L9 may be connected to the water tank.
  • the container (not shown) which accommodates anionic polymer flocculent or its aqueous solution can be connected to the line L9.
  • the to-be-processed water to which the anionic polymer flocculant is added flows upward from the bottom surface into the sedimentation tank 30 through the line L3.
  • the upward flow of the treated water forms a sludge blanket.
  • the settling tank 30 is a granulating type settling tank, and granulation of the aggregates is carried out by agitation of the sludge blanket, in particular, coarsening of the aggregates by slow agitation, mechanical dewatering action, rolling movement, etc.
  • a pellet of aggregates is formed.
  • the settling tank 30 is provided with a stirring blade 31 for stirring the water to be treated, which is driven by a motor M.
  • the granulated pellets form a sludge blanket Z1 and a layer Z2 of clear water is formed on the sludge blanket.
  • clear water is discharged to the line L4 as treated water.
  • a concentration unit 33 communicating with the inside of the settling tank 30 through the opening 32 is provided.
  • Excess sludge (pellets floating above the sludge blanket Z1) in the sedimentation tank 30 is made to overflow and flow into the concentration unit 33, and is sedimented and concentrated in the concentration unit 33.
  • a line L5 for extracting concentrated sludge from the layer Z3 of concentrated sludge (pellets concentrated to a high concentration) deposited in the concentration unit 33 is connected to the lower part of the concentration unit 33, and the concentrated sludge is coagulated and settled from the line L5. Discharged to the outside of the
  • solid-liquid separation can be performed by forming aggregates of metal hydroxide having a high sedimentation rate.
  • a sludge blanket-type settling tank (which may be a granulated settling tank) can be used.
  • the residence time of the cationic polymer flocculant in the coagulating and precipitating apparatus before the addition of the anionic polymer flocculant is preferably 1 minute or more, more preferably 2 minutes or more.
  • a cationic polymer flocculant may be added in the raw water tank 10 without providing the primary coagulation tank 20. That is, the line L8 may be connected to the raw water tank 10.
  • the line L8 may be connected to the raw water tank 10.
  • many raw water tanks are large, and primary aggregation flocs formed by the addition of a cationic polymer flocculant tend to stay in the corners of the raw water tanks.
  • the water to be treated which has a relatively low content of primary aggregation floc, will flow into the sedimentation tank, and the anionic polymer flocculant added before the sedimentation tank is likely to leak out into the treated water without reaction.
  • the anionic polymer flocculant added before the sedimentation tank is likely to leak out into the treated water without reaction.
  • the primary flocculation tank 20 In order to make it easy to avoid such retention of the primary flocculation floc, adding the cationic polymer flocculant in the primary flocculation tank 20 instead of the raw water tank 10 by providing the primary flocculation tank 20 equipped with a stirrer. preferable.
  • the primary flocculation tank 20 is smaller than the raw water tank 10, and it is easier to prevent the stagnation of flocculated flocs temporarily if it is cylindrical.
  • Each line can be formed using an appropriate piping material.
  • Test 8 to 28 The pH value adjusted by the addition of caustic soda was changed as shown in Table 3.
  • the cationic polymer flocculant was changed, and the ratio of cationic groups was changed as shown in Table 3.
  • the same test as Test 1 was conducted except for that. However, only the flocculated floc diameter was measured here.
  • the test conditions of Tests 8, 15 and 22 are identical to the test conditions of Tests 2, 4 and 6 respectively as described above.
  • a cationic polymer coagulant having a cation group ratio of 30 mol% or less, preferably 15 mol% or less, more preferably 8 mol% or less, and an anionic polymer coagulant It is expected that cohesion flocs having a large size and a high sedimentation rate can be formed by using in combination.
  • Example 1 A continuous water flow test was carried out using an alkaline aggregation and precipitation apparatus having the configuration shown in FIG. 1 to measure the SS concentration of the treated water.
  • the anionic polymer flocculant one having an anion group ratio of 17 mol% used in the above test was used.
  • Fe, Zn and Pb were removed most at pH 9-12. In this example, the pH was adjusted to 9 in consideration of the amount of alkali added.
  • Raw water of the water quality shown in Table 1 was adjusted to pH 9 in the raw water tank 10 and was sent to the primary aggregation tank 20 by the pump P.
  • a cationic polymer flocculant was added so that the concentration in the water to be treated was 1 mg / L, and rapid stirring and mixing were carried out with the stirring blade 21 to form fibrous flocculated flocs.
  • the cationic polymer flocculant one having a cation group ratio of 3 mol% used in the above test was used.
  • the raw water was aerated in the raw water tank 10 by the air supplied from the blower B through the line L6.
  • an anionic polymer flocculant for coarsening of flocculates in primary flocculation water (line L3) discharged from the primary flocculation tank 20 in the treated water.
  • the concentration was added to 1 mg / L.
  • the primary aggregation water and the anionic polymer flocculant are gently mixed by slow stirring, and thereby the coarsened aggregate is spherical due to the mechanical dewatering action by the slow stirring and rolling motion. A pellet was formed.
  • the to-be-processed water was isolate
  • the SS concentration of the treated water thus obtained was measured.
  • Examples 2 to 7 and Comparative Examples 1 to 3 In Examples 2 to 7, as the cationic polymer flocculant, those having a cationic group ratio of 5, 8, 15, 17, 27, and 30 mol%, respectively, were used. In Comparative Examples 1 to 3, as the cationic polymer flocculant, those having a cationic group ratio of 35, 45, and 70 mol%, respectively, were used. The cationic polymer flocculants having a cationic group ratio of 8, 15, 35, 45 and 70 mol% are the same as those used in the above-mentioned test. A continuous water flow test was conducted in the same manner as in Example 1 except for the above, and the SS concentration of the treated water was measured.
  • Comparative Example 4 The cationic polymer flocculant was not added in the primary flocculation tank 20. In addition, an anionic polymer flocculant was added so that the concentration in the water to be treated was 2 mg / L. A continuous water flow test was carried out in the same manner as in Example 1 except for these, and the SS concentration of the treated water was measured.
  • Example 13 As the cationic polymer flocculant, one having the above-mentioned cation group ratio of 30 mol% was used, and one having the above anion group ratio of 10 mol% was used as the anionic polymer flocculant. A continuous water flow test was conducted in the same manner as in Example 1 except for the above, and the SS concentration of the treated water was measured. The SS concentration was 8.0 mg / L, which was better than when the anionic polymer flocculant was used alone.
  • Example 14 As the cationic polymer flocculant, one having the above-mentioned cation group ratio of 30 mol% was used, and one having the above anion group ratio of 41 mol% was used as the anionic polymer flocculant. A continuous water flow test was conducted in the same manner as in Example 1 except for the above, and the SS concentration of the treated water was measured. The SS concentration was 5.0 mg / L, which was better than when the anionic polymer flocculant was used alone.

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  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Un procédé de traitement de l'eau dans lequel de l'eau contenant des ions métalliques est soumise à une coagulation/sédimentation alcaline à un pH supérieur ou égal à 8, dans lequel un coagulant polymère cationique et un coagulant polymère anionique sont ajoutés successivement dans cet ordre et, par conséquent, il devient possible de produire de l'eau traitée plus claire comparativement à un cas où seul un coagulant polymère anionique est ajouté. Un procédé de traitement de l'eau comprenant les étapes consistant à : (i) ajouter un alcali à de l'eau contenant des ions métalliques dont il faut tenir compte et permettre ensuite à un hydroxyde métallique de précipiter à un pH de 8 ou plus pour produire une matière en suspension; (ii) ajouter un coagulant polymère cationique ayant une teneur en groupe cation de 30 % en moles ou moins à l'eau obtenue à l'étape i, puis ajouter un coagulant polymère anionique ayant une teneur en groupe anion de 10 % en moles ou plus au produit résultant pour produire des agrégats de la matière en suspension; et (iii) permettre la formation d'une couverture de boue et d'une couche d'eau clarifiée à partir de l'eau obtenue à l'étape ii, puis obtenir de l'eau traitée à partir de la couche de l'eau clarifiée et obtenir des boues à partir de la couverture de boue. L'invention concerne également un dispositif de mise en œuvre du procédé.
PCT/JP2018/028680 2017-12-26 2018-07-31 Procédé et système de traitement de l'eau WO2019130635A1 (fr)

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JPH07275606A (ja) * 1994-04-11 1995-10-24 Nippon Steel Corp 固液分離装置
JP2002113473A (ja) * 2000-10-06 2002-04-16 National Institute Of Advanced Industrial & Technology 有害金属イオンの除去方法及び除去剤
JP2011139997A (ja) * 2010-01-07 2011-07-21 Daiyanitorikkusu Kk 廃水の凝集処理方法
JP2012091079A (ja) * 2010-10-25 2012-05-17 Daiyanitorikkusu Kk 有機凝結剤
WO2014038537A1 (fr) * 2012-09-10 2014-03-13 栗田工業株式会社 Procédé et appareil de traitement de l'eau
JP2015066546A (ja) * 2013-10-01 2015-04-13 栗田工業株式会社 無機イオン含有排水の処理方法及び装置

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