JP2015223534A - Apparatus and method for treating iron/manganese-containing water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for treating iron/manganese-containing water, which has a simpler structure, in which a manganese oxide catalyst is restrained from being dropped in a support layer even when the iron/manganese-containing water is made to pass therethrough at a high linear velocity, and which can be operated more stably in comparison with the conventional system.SOLUTION: The apparatus for treating iron/manganese-containing water includes: oxidizer adding means for adding an oxidizer to the iron/manganese-containing water in which at least one of iron and manganese is contained; an oxidation treatment tank 12 in which the oxidizer-added water is treated oxidatively and the manganese oxide catalyst containing manganese dioxide is packed; and a membrane filtration unit 14 in which the oxidatively-treated water is subjected to membrane filtration. The particle having the specific gravity larger than 2.6 is used as a supporting particle which is made adjacent to the manganese oxide catalyst existing in the support layer, that is used for supporting the manganese oxide catalyst in the oxidation treatment tank 12, and which constitutes an adjacent layer.

Description

  The present invention relates to a treatment apparatus and treatment method for iron / manganese-containing water containing at least one of iron and manganese.

  River water, groundwater, etc., which are water sources, may contain soluble iron and soluble manganese. As a method for removing soluble iron and soluble manganese in such iron / manganese-containing water, a contact manganese sand filtration method is known. The contact manganese sand filtration method is a method in which soluble manganese is precipitated by oxidation and trapped in manganese sand while raw water is passed through the manganese sand filling tank in a downward flow.

  In addition, as a method of performing high-speed treatment of iron / manganese-containing water, while adding chlorine to raw water, an upward flow of, for example, 1,000 m / day or more is applied to an oxidation treatment tank filled with a manganese oxide catalyst. A method is known in which iron and manganese in raw water are oxidized and precipitated by passing water, and the oxidized precipitate is removed by a subsequent filtration membrane (see, for example, Patent Document 1).

  Compared with the contact manganese sand filtration method, this method can pass the raw water at a higher linear speed, so the equipment can be downsized and there is less blockage due to turbidity in the raw water, so the oxidation treatment tank can be washed. It has the advantage of being less frequent.

  In such an apparatus, as generally shown in Patent Documents 2 and 3, for example, gravel is filled in the lower part of the manganese oxide catalyst layer in the oxidation treatment tank to form a support layer, and the manganese oxide catalyst flows out to the lower part. It has been done to prevent. However, when water is passed through the oxidation treatment tank at a high linear velocity, the gravel of the support layer also flows, and the manganese oxide catalyst may gradually fall between the gravel. As a result, there has been a problem that manganese or the like in raw water adheres, grows and enlarges on the surface of the manganese oxide catalyst in the support layer, and the support layer is blocked. In addition, it is possible to prevent gravel itself from flowing even at a high linear velocity by increasing the particle size of gravel, but in that case, the manganese oxide catalyst having a particle size of about 0.4 to 1.0 mm and gravel There was a problem that the difference in particle size was increased and the manganese oxide catalyst dropped into the support layer as well.

  In order to solve such a problem, as in Patent Document 3, a chamber chamber into which raw water flows is formed at the bottom of a tower body filled with a granular manganese catalyst, and a large number of chamber chambers provided on the upper surface of the chamber chamber are formed. An upflow type manganese contact tower for supplying raw water to a manganese catalyst packed bed from a dispersion nozzle has been proposed. However, the apparatus of Patent Document 3 has a problem that the apparatus becomes complicated and the cost increases.

Japanese Patent No. 3786888 Japanese Patent No. 40113565 Japanese Patent No. 4599335

  The object of the present invention is iron / manganese, which has a simpler structure, suppresses the manganese oxide catalyst from falling into the support layer even when water flows at a high linear velocity, and enables stable operation compared to conventional systems. It is in providing the processing apparatus and processing method of contained water.

  The present invention provides an oxidizing agent adding means for adding an oxidizing agent to iron / manganese-containing water containing at least one of iron and manganese, and manganese dioxide for oxidizing the oxidizing agent-added water to which the oxidizing agent is added. An oxidation treatment tank filled with an oxidation catalyst containing, and a membrane filtration device for membrane-filtering the oxidized treatment water, and adjacent to the oxidation catalyst in a support layer that supports the oxidation catalyst in the oxidation treatment tank This is an iron / manganese-containing water treatment apparatus using particles having a specific gravity of greater than 2.6 as support particles constituting the adjacent layer.

  In the iron / manganese-containing water treatment apparatus, the support particles constituting the adjacent layer preferably include manganese dioxide particles.

  In the iron / manganese-containing water treatment apparatus, it is preferable that the particle size of the support particles constituting the adjacent layer is larger than 1.0 mm.

  In the iron / manganese-containing water treatment apparatus, the support layer is composed of a plurality of layers, and the particle size of the support particles constituting the adjacent layer is smaller than the particle size of the support particles constituting the other layers. preferable.

  In the iron / manganese-containing water treatment apparatus, the support particles constituting the support layer preferably have a particle size larger than that of the oxidation catalyst.

  In the iron / manganese-containing water treatment apparatus, it is preferable that flow rate control means for controlling a water flow rate by an upward flow in the oxidation treatment tank to be greater than 1000 m / day and not more than 3600 m / day.

  Moreover, this invention contains manganese dioxide, the oxidizing agent addition process which adds an oxidizing agent to the iron / manganese containing water containing at least 1 among iron and manganese, and the oxidizing agent addition water to which the said oxidizing agent was added An oxidation treatment step in which water is passed through an oxidation treatment tank filled with an oxidation catalyst to oxidize, and a membrane filtration step in which the oxidized treatment water is passed through a membrane filtration device and subjected to membrane filtration. In the treatment tank, particles having a specific gravity greater than 2.6 are used as the support particles constituting the adjacent layer adjacent to the oxidation catalyst in the support layer that supports the oxidation catalyst. This is a treatment method of iron / manganese-containing water that is controlled to be greater than 1000 m / day and not more than 3600 m / day.

  In the present invention, by using particles larger than the specific gravity 2.6 as the support particles constituting the adjacent layer adjacent to the oxidation catalyst in the support layer of the oxidation treatment tank, water can be passed at a high linear velocity with a simpler structure. In addition, it is possible to provide a treatment apparatus and treatment method for iron / manganese-containing water that suppresses the manganese oxide catalyst from falling into the support layer and enables stable operation as compared with the conventional system.

It is a schematic block diagram which shows an example of the processing apparatus of the iron / manganese containing water which concerns on embodiment of this invention. It is a schematic block diagram which shows an example of the oxidation treatment tank in the processing apparatus of the iron / manganese containing water which concerns on embodiment of this invention. It is the schematic which shows the layer structure of the oxidation treatment tank used in the Example. It is the schematic which shows the layer structure of the oxidation treatment tank used by the comparative example. It is a figure which shows the time-dependent change of the inlet pressure of the oxidation process layer in an Example and a comparative example.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

  An outline of an example of the iron / manganese-containing water treatment apparatus according to the embodiment of the present invention is shown in FIG. The iron / manganese-containing water treatment device 1 includes an oxidation treatment tank 12 filled with an oxidation catalyst containing manganese dioxide, and a membrane filtration device 14. The iron / manganese-containing water treatment apparatus 1 may include a raw water tank 10 and a treated water tank 16.

  In the iron / manganese-containing water treatment apparatus 1 of FIG. 1, a raw water pipe 26 is connected to the inlet of the raw water tank 10, and the outlet of the raw water tank 10 and the oxidizing agent added water inlet of the oxidation treatment tank 12 are connected via a pump 20. The raw water supply pipe 28 is connected. The outlet of the oxidation treatment tank 12 and the inlet of the membrane filtration device 14 are connected by an oxidation treatment water pipe 30, and the outlet of the membrane filtration water of the membrane filtration device 14 and the inlet of the treatment water tank 16 are connected by a membrane filtration water pipe 32. Yes. A treated water pipe 34 is connected to the treated water outlet of the treated water tank 16. Further, the backwash water outlet of the treated water tank 16 and the middle of the membrane filtrate water pipe 32 are connected by a backwash water pipe 38 via the pump 24. The outlet of the oxidant tank 18 is connected to the downstream side of the pump 20 of the raw water supply pipe 28 by an oxidant pipe 36 via the pump 22.

  The operation of the iron / manganese-containing water treatment method and the iron / manganese-containing water treatment apparatus 1 according to the present embodiment will be described.

  Iron / manganese-containing water containing at least one of iron and manganese, which is raw water, is stored in the raw water tank 10 through the raw water pipe 26 as necessary. The iron / manganese-containing water is sent to the oxidation treatment tank 12 through the raw water supply pipe 28 by the pump 20, and in the middle of the raw water supply pipe 28, the oxidant from the oxidant tank 18 passes through the oxidant pipe 36 by the pump 22. / Addition to manganese-containing water (oxidizing agent adding step), and sent to the oxidation treatment tank 12 as oxidizing agent added water. In the present embodiment, the oxidant tank 18, the pump 22, and the oxidant pipe 36 function as oxidant addition means.

  In the oxidation treatment tank 12, the oxidant-added water is passed in an upward flow and is oxidized by an oxidation catalyst containing filled manganese dioxide (oxidation treatment step). While the oxidizing agent is added to the iron / manganese-containing water, water is passed through the oxidation treatment tank 12 filled with the oxidation catalyst containing manganese dioxide, so that dissolved iron and dissolved manganese are oxidized and precipitated.

  Oxidized oxidized water is fed from the outlet of the oxidation treatment tank 12 to the membrane filtration device 14 through the oxidation treated water pipe 30, and the oxidized precipitate is subjected to membrane filtration in the membrane filtration device 14 (membrane). Filtration step).

  The membrane filtrate of the membrane filtration device 14 is sent to the treated water tank 16 as needed through the membrane filtrate pipe 32 and stored. A predetermined amount of treated water stored in the treated water tank 16 is discharged through the treated water pipe 34.

  When it is necessary to clean the membrane of the membrane filtration device 14, at least a part of the treated water stored in the treatment water tank 16 is supplied from the membrane filtration water outlet side to the membrane filtration device 14 through the backwash water pipe 38 by the pump 24. Then, the membrane is backwashed (backwashing step). In the present embodiment, the treated water tank 16, the pump 24, and the backwash water pipe 38 function as backwashing means.

  In the iron / manganese-containing water treatment apparatus 1 according to the present embodiment, dissolved iron and manganese are contained by passing water through an oxidation treatment tank 12 filled with an oxidation catalyst containing manganese dioxide while adding an oxidizing agent to the iron / manganese-containing water. A method is used in which dissolved manganese is oxidized and precipitated, and the oxidized water is subjected to membrane filtration. In the method according to the present embodiment, as shown in FIG. 2, in the oxidation treatment tank 12, specific gravity 2 is used as support particles constituting the adjacent layer 44 adjacent to the oxidation catalyst 40 in the support layer 42 that supports the oxidation catalyst 40. Use particles larger than .6. As a result, the manganese oxide catalyst can be prevented from falling into the support layer 42 even when water is passed at a high linear velocity with a simpler structure, and stable operation can be achieved as compared with the conventional system. For example, even if water is passed at a high linear speed of LV 3600 m / day, the flow of the support layer 42 is suppressed, and stable operation is possible. Further, it is not necessary to install a complicated nozzle as in Patent Document 3, and processing with a simpler structure is possible at low cost. In the present specification, for example, the specific gravity of the oxidation catalyst (manganese dioxide) and the support particles is true specific gravity, and is an average value of measured values in a surface dry saturated state. In this specification, the oxidation catalyst (manganese dioxide) and the particles having a specific gravity A of the support particles may include particles having a specific gravity A ± A × 0.05. For example, particles having a specific gravity of 2.6 may include particles in the range of 2.6 ± 2.6 × 0.05 = 2.47 to 2.73, but the specific gravity is 2 as an average value of the above measured values. .6 particles.

  The support layer 42 is composed of at least one layer, and is preferably composed of a plurality of layers from the viewpoint of further suppressing knitting, unevenness, etc. of the flow in the oxidation treatment tank 12. In the example illustrated in FIG. 2, the support layer 42 includes, for example, three layers and includes a stacked layer 46, a layer 48, and an adjacent layer 44. Layer 46 is located on the bottom layer. Layer 48 is located adjacent to and above layer 46. The adjacent layer 44 is adjacent to the layer 48 and the oxidation catalyst 40 and is located above the layer 48 and below the oxidation catalyst 40.

  Of the support layer 42, the type of support particles constituting the adjacent layer 44 adjacent to the oxidation catalyst 40 is greater than a specific gravity of 2.6, and suppresses knitting or unevenness of the flow in the oxidation treatment tank 12. There is no particular limitation as long as it is possible. The specific gravity of the support particles constituting the adjacent layer 44 is preferably 3.5 or more, and more preferably 4.0 or more. Examples of such support particles include inorganic particles such as manganese dioxide particles (specific gravity 4.0) and garnet particles (specific gravity 3.5) containing manganese dioxide as a main component (50% by weight or more), magnetite (specific gravity 5). .2) and the like. Among them, it is preferable to use manganese dioxide particles as support particles from the viewpoint of further promoting manganese oxidation and further improving the quality of treated water.

  If the specific gravity of the supporting particles constituting the adjacent layer 44 is 2.6 or less (for example, gravel), the water flows at a high linear velocity, the supporting layer 42 flows and unevenness occurs. The upper limit of the specific gravity of the support particles is not particularly limited. However, if support particles having a high specific gravity exceeding 10 are used, the handling particles are inconvenient and inconvenient when the support particles of the support layer 42 are exchanged. is there.

  The kind of support particles constituting the support layer 42 (for example, the layers 46 and 48) other than the adjacent layer 44 may be the same type as that of the support particles constituting the adjacent layer 44, or a different kind. There may be. As the support layer 42 (for example, the layers 46 and 48) other than the adjacent layer 44, particles having a specific gravity greater than 2.6 such as manganese dioxide particles (specific gravity 4.0) and garnet particles (specific gravity 3.5) may be used. Particles having a specific gravity of 2.6 or less, such as gravel (specific gravity 2.6), may be used.

  In the iron / manganese-containing water treatment apparatus according to this embodiment, the particle size of the support particles constituting the support layer 42 is preferably larger than the particle size of the oxidation catalyst. More specifically, for example, the design maximum particle size of the support particles is preferably larger than the particle size of the oxidation catalyst. The particle size of the support particles constituting the adjacent layer 44 is preferably larger than 1.0 mm, more preferably 1.5 mm or more, and further preferably 2 mm or more and 8 mm or less. When the particle size of the support particles is less than 1.0 mm, the support layer 42 may flow to cause unevenness, and when the particle size of the support particles exceeds 8 mm, the manganese oxide catalyst falls into the support layer 42. There is. In the present specification, for example, the particle size of the support particles is a particle size defined by the Japan Water Works Association (JWWA A103: 2006) Waterworks Gravel Abstract for Waterworks), and the particle size of the oxidation catalyst is an effective diameter.

  By using support particles having a specific gravity of greater than 2.6, preferably a specific gravity of 3.5 or greater and a particle size of greater than 1.0 mm, preferably 1.5 mm or greater, for example, at a high linear velocity of LV3600 m / day. Even if water is passed, the flow of the support particles is suppressed and stable operation is possible.

  As the structure of the support layer 42, the support layer 42 is composed of a plurality of layers, and the particle diameter of the support particles constituting the adjacent layer 44 is the particle diameter of the support particles constituting the other layers (for example, layers 46 and 48). Preferably it is smaller. When the support layer 42 is constituted by three or more layers, it is preferable that each layer is constituted by support particles having a smaller particle diameter from the lowest layer to the adjacent layer 44.

  The layer thickness of each layer constituting the single-layer or multiple-layer support layer 42 may be determined according to the water flow rate and the like, and is not particularly limited, but may be, for example, in the range of about 50 mm to 200 mm. When the support layer 42 is composed of a plurality of layers, the layer thickness of each layer may be the same or different.

  In the example of FIG. 2 showing the configuration of the support layer 42, for example, the particle size of the support particles constituting the adjacent layer 44 (upper stage) is 2 to 4 mm, and the particle size of the support particles constituting the layer 48 (middle stage) is 4. The particle diameter of the support particles constituting the layer 46 (lower stage) may be 8 to 12 mm. Of course, particles having a specific gravity of more than 2.6, preferably a specific gravity of 3.5 or more may be used in all of the adjacent layers 44 and the layers 46 and 48. However, those with a particle size of 4 to 8 mm are difficult to flow at LV3600 m / day even with the most common gravel with a specific gravity of about 2.6, so the gravel with a specific specific gravity of about 2.6 is satisfactory for the layers 46 and 48. It ’s better in terms of cost.

  The iron / manganese-containing water to be treated contains at least one of iron and manganese, preferably contains at least manganese, and usually contains both iron and manganese. The content of soluble iron in the iron / manganese-containing water is, for example, in the range of 0.1 to 10 mg / L, and the content of soluble manganese is, for example, in the range of 0.01 to 5 mg / L.

  Examples of the iron / manganese-containing water to be treated include river water, groundwater, lake water, and the like.

  Examples of the oxidizing agent include sodium hypochlorite, bleached powder, potassium permanganate, chlorine dioxide and the like, and sodium hypochlorite is preferable from the viewpoint of running cost, versatility and the like.

  The amount of oxidant added is, for example, in the range of 0.5 mol to 2 mol with respect to 1 mol of iron for soluble iron in iron / manganese-containing water, The range is from 1 mol to 4 mol with respect to 1 mol of manganese content. If the addition amount of the oxidizing agent is less than the above value, the reaction may be insufficient. If it is excessively added, the cost may be disadvantageous and the amount of trihalomethane generated may increase.

  Examples of the oxidation catalyst containing manganese dioxide used in the oxidation treatment tank 12 include an oxidation catalyst in which manganese dioxide is granular and solid, manganese sand, and the like. Further, the manganese dioxide is not particularly limited, and examples thereof include manganese dioxide having α-type, β-type, ε-type, γ-type, λ-type, δ-type, and R-type crystal structures. From this point, manganese dioxide having a β-type crystal structure is preferable.

  In the oxidation treatment tank 12, the oxidation catalyst containing manganese dioxide is in an upward flow, and raw water is passed through the catalyst layer to be in a fluid state to form an expanded bed.

The density of the oxidation catalyst containing manganese dioxide is preferably 2.8 g / cm ³ or more. When the density of the oxidation catalyst containing manganese dioxide is less than 2.8 g / cm ³ , the catalyst develops when water is passed at high speed, and the tank height of the oxidation treatment tank 12 may increase.

  The particle diameter of the oxidation catalyst containing manganese dioxide is preferably in the range of 0.4 mm to 1.0 mm. If the particle size of the oxidation catalyst containing manganese dioxide is less than 0.4 mm, the rate of expansion of the catalyst may increase, and small particles may flow out. If the particle size exceeds 1.0 mm, the surface area of the catalyst decreases and the reaction Efficiency may be reduced.

  The flow rate of water flow due to the upward flow in the oxidation treatment tank 12 is, for example, a high linear velocity of 1000 m / day or more and 4000 m / day or less, even if it is a high linear velocity in the range of 2400 m / day or more and 3600 m / day or less. The present invention is applicable to the iron / manganese-containing water treatment apparatus and treatment method according to the embodiment. If the water flow velocity due to the upward flow in the oxidation treatment tank 12 is less than 1000 m / day, the catalyst may not flow substantially uniformly, and a single flow may occur. If the flow rate exceeds 3600 m / day, the rate of development of the catalyst increases. The tank height of the oxidation treatment tank 12 may increase.

  The reaction temperature in the oxidation treatment tank 12 is, for example, in the range of 1 ° C to 50 ° C.

  The filtration membrane used in the membrane filtration device 14 is not particularly limited as long as it can filter precipitates such as oxidized iron and manganese, and examples thereof include a UF membrane and an MF membrane. Manganese dioxide A UF membrane is preferable because fine manganese particles (for example, less than 0.1 μm) and the like peeled from the oxidation catalyst containing can be removed.

  The iron / manganese-containing water treatment apparatus and treatment method according to the present embodiment can be suitably applied in, for example, a water purification plant, groundwater use water treatment, and the like.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

<Examples and Comparative Examples>
1, two columns (φ125 mm × 2000 mm) are filled with support particles to form a support layer, and then a manganese oxide catalyst having a β-type crystal structure (particle size 0.5 mm, specific gravity 4. 0) was charged in units of 4.8 L to form a catalyst layer (height 390 mm), which was used as an oxidation treatment tank. Each apparatus was continuously operated with an upward flow of a treatment flow rate of 1500 L / h (LV 3000 m / day). In both the examples and comparative examples, the structure of the support layer is the upper layer (adjacent layer): particle size 2 to 4 mm × layer thickness 100 mm, middle layer: particle size 4 to 8 mm × layer thickness 100 mm, lower layer: particle size 8 to 12 mm × layer thickness 100 mm In the examples, manganese dioxide particles (manganese gravel) having a specific gravity of 4.0 were used as support particles for the upper layer, and gravel having a specific gravity of 2.6 was used in all other cases (see FIG. 3). In the comparative example, gravel having a specific gravity of 2.6 was used for the upper layer, middle layer, and lower layer (see FIG. 4). Sodium hypochlorite was injected as an oxidizing agent so that the residual chlorine concentration was 0.4 mg / L. The raw water is one in which a φ6 mm discharge port is provided in a row at seven locations at intervals of 18 mm in the side surface of a φ15 mm cylindrical tube in the lower layer of the support layer, and the cylindrical tube is used in the diameter direction of the lower layer of the column support layer. It was inserted so that the discharge port faced downward and supplied by a pump. The raw water quality was as shown in Table 1. FIG. 5 shows the change over time in the inlet pressure of the oxidation treatment tank, and Table 2 shows the quality of the treated water.

  In the example in which manganese dioxide particles having a specific gravity of 4.0 were used as the upper layer of the support layer, the pressure at the oxidation treatment tank inlet was almost constant during the experiment period, and stable operation was achieved, whereas the upper layer had a normal specific gravity of 2. In the comparative example using gravel of No. 6, a drop of the manganese oxide catalyst into the support layer was visually observed, and an increase in the oxidation treatment tank inlet pressure was gradually observed. Moreover, although there was no difference in both at the initial stage regarding the quality of the treated water, after the pressure increase at the oxidation treatment tank inlet, in the case of the normal gravel of the comparative example, the treated water quality deteriorated.

Using the column of the above-mentioned example, continuous operation was performed with the processing flow rate being LV1000, 2400, 3000, 3600, 4000 m / day upward flow. The flow of the support layer was confirmed visually and evaluated according to the following criteria. The results are shown in Table 3.
○: No flow △: Slight flow ×: Flow

  In the column of the example, no flow of the support layer was observed even when water was passed at a high linear velocity of LV3600 m / day. On the other hand, in the column of the comparative example, the flow of the support layer was slightly observed at LV2400 m / day, and the flow of the support layer was observed at LV3000 m / day.

  As described above, the apparatus of the embodiment has a simpler structure and suppresses the manganese oxide catalyst from falling into the support layer even when water is passed at a high linear speed, enabling stable operation compared to the conventional system. became.

  DESCRIPTION OF SYMBOLS 1 Iron / manganese containing water processing apparatus, 10 Raw water tank, 12 Oxidation processing tank, 14 Membrane filtration apparatus, 16 Treated water tank, 18 Oxidant tank, 20, 22, 24 Pump, 26 Raw water piping, 28 Raw water supply piping, 30 Oxidation Treated water piping, 32 membrane filtered water piping, 34 treated water piping, 36 oxidant piping, 38 backwash water piping, 40 oxidation catalyst, 42 support layer, 44 adjacent layers, 46, 48 layers.

Claims (7)

An oxidizing agent adding means for adding an oxidizing agent to iron / manganese-containing water containing at least one of iron and manganese;
An oxidation treatment tank filled with an oxidation catalyst containing manganese dioxide, which oxidizes the oxidant-added water to which the oxidant is added;
A membrane filtration device for membrane filtration of the oxidized treated water;
With
An iron / manganese-containing water treatment apparatus using particles having a specific gravity of greater than 2.6 as support particles constituting an adjacent layer adjacent to the oxidation catalyst in a support layer supporting the oxidation catalyst in the oxidation treatment tank. . The iron / manganese-containing water treatment apparatus according to claim 1,
An iron / manganese-containing water treatment apparatus, wherein the support particles constituting the adjacent layer contain manganese dioxide particles. The iron / manganese-containing water treatment apparatus according to claim 1 or 2,
The iron / manganese-containing water treatment apparatus, wherein a particle diameter of the support particles constituting the adjacent layer is larger than 1.0 mm. The iron / manganese-containing water treatment apparatus according to any one of claims 1 to 3,
The iron / manganese-containing water treatment apparatus, wherein the support layer is composed of a plurality of layers, and the particle size of the support particles constituting the adjacent layer is smaller than the particle size of the support particles constituting the other layers. . The iron / manganese-containing water treatment apparatus according to any one of claims 1 to 4,
The iron / manganese-containing water treatment apparatus, wherein a particle size of the support particles constituting the support layer is larger than a particle size of the oxidation catalyst. The iron / manganese-containing water treatment apparatus according to any one of claims 1 to 5,
An iron / manganese-containing water treatment apparatus, comprising flow rate control means for controlling a flow rate of water flow by upward flow in the oxidation treatment tank to be greater than 1000 m / day and not more than 3600 m / day. An oxidizing agent adding step of adding an oxidizing agent to iron / manganese-containing water containing at least one of iron and manganese;
An oxidation treatment step in which the oxidant-added water to which the oxidant has been added is passed through an oxidation treatment tank filled with an oxidation catalyst containing manganese dioxide to oxidize, and
A membrane filtration step of passing the oxidized treated water through a membrane filtration device and performing membrane filtration;
Including
In the oxidation treatment tank, particles having a specific gravity of greater than 2.6 are used as support particles constituting the adjacent layer adjacent to the oxidation catalyst in the support layer that supports the oxidation catalyst.
A method for treating iron / manganese-containing water, wherein a flow rate of water flow by upward flow in the oxidation treatment tank is controlled to be greater than 1000 m / day and not more than 3600 m / day.