JP6922165B2 - Water treatment equipment - Google Patents

Description

The present invention relates to a water treatment device that removes a musty odor substance from water to be treated (water to be treated), and particularly water that removes a musty odor substance from purified water such as tap water obtained by purifying raw water such as river water or groundwater. Regarding processing equipment.

In a water purification plant, an adsorption type water treatment device using granular activated carbon is generally known as a conventional device as a means for removing a musty odor substance to a level equal to or lower than the water quality standard of tap water (see, for example, Patent Document 1). This is a simple water treatment device that adsorbs and removes musty odor substances in the water to be treated by passing water to be treated through a packed layer filled with granular activated carbon.

However, it is known that granular activated carbon forms pores in the order of macropores, mesopores, and micropores, and the diffusion to the micropores, which are adsorption sites for musty odor substances, is small, and the shape is granular, so the contact efficiency with purified water is high. Since it is low, there are problems such as slow adsorption rate and easy short pass of water to be treated. In addition, since the adsorbent has various pore diameters, the proportion of micropores that function to adsorb mold odor substances is small, and the amount of mold odor substances that effectively function per unit weight (effective adsorption amount) is small. There was also. Therefore, since the filling amount of the granular activated carbon in the conventional apparatus and the apparatus become large-scale, there is a problem that the replacement cost of the granular activated carbon and the equipment cost are required.

In addition, the conventional device allows the water to be treated to pass through for a certain period of time, and when the above-mentioned musty odor substance breaks out and the adsorption ability cannot be obtained, it is replaced with a new one or once taken out and regenerated. It is known to maintain the ability to remove musty odor substances. However, as described above, since the effective adsorption amount of the musty odor substance of the conventional device is small, in order to reduce the frequency of replacement and regeneration, a large amount of granular activated carbon is filled and adsorbed for a long period of time (water flow to be treated). The processing format to be performed is common. Due to this long-term adsorption, clogging of the packed bed occurs due to the propagation of microorganisms on the granular activated carbon and the adhesion of solid substances, so that there is a problem that regular cleaning and backwashing are required.

Japanese Unexamined Patent Publication No. 7-171385

It is also possible to improve the contact efficiency between the water to be treated and the adsorbent and improve the adsorption performance to a certain level by making the particle size of the granular activated carbon finer or increasing the thickness of the packed bed (longer water flow distance). Although it is possible, since the water flow pressure loss coefficient is increased, the above-mentioned clogging is more likely to occur. Therefore, since it cannot be operated as equipment, such a measure cannot be adopted by the conventional device.

Therefore, the present invention has been made to solve the above problems, and an object thereof is to use an adsorbent which has a small water flow pressure loss coefficient and can obtain an adsorbent performance of a musty odor substance even when water to be treated is passed at high speed. However, it is basically to provide a water treatment device that does not clog the adsorbent and replace it.

As a result of diligent studies, the present inventors have found that the above problems can be solved by the means shown below, and have arrived at the present invention. That is, the present invention has the following configuration.

1. 1. Water to be treated is passed through an adsorption element having a water flow pressure loss coefficient of 200 mmAq · s / cm ² or less and a pore volume of 30 Å or less of which is 95% or more of the total pore volume, and the adsorption element is covered. An adsorption step of adsorbing at least a musty odor substance in the treated water to discharge the treated water, a dehydration step of aerating gas through the adsorption element to remove the adsorbed water adhering to the adsorption element, and heating the adsorption element. A water treatment apparatus characterized in that a desorption step of ventilating a gas to desorb at least a musty odor substance adsorbed on the adsorption element is repeatedly performed in this order.
2. A treatment tank accommodating an adsorption element and a treatment tank connected to the treatment tank, the water to be treated is allowed to flow through the adsorption element in the treatment tank, and at least a musty odor substance in the water to be treated is adsorbed by the adsorption element for treatment. A water passage unit for discharging water, a gas ventilation unit connected to the treatment tank, and a gas ventilation unit for ventilating gas through the adsorption element in the treatment tank to remove the adsorbed water adhering to the adsorption element, and the treatment tank. The adsorbent element is provided with a heated gas aeration unit for desorbing at least a musty odor substance adsorbed on the adsorbent element by aerating the adsorbent element in the processing tank. A water treatment apparatus having a coefficient of 200 mm Aq · s / cm ² or less and a pore volume of 30 Å or less having a pore volume of 95% or more of the total pore volume.
3. 3. The water treatment apparatus according to 1 or 2, further comprising a return route for allowing the adsorbed water removed from the adsorption element to flow through the adsorption element again.
4. The water treatment according to any one of 1 to 3 above, wherein the ventilation direction in which the heating gas is ventilated and the flow direction in which the water to be treated is allowed to flow through the adsorption element are opposite to each other. Device.
5. The water treatment apparatus according to any one of claims 1 to 4, wherein the adsorption element includes a structure of activated carbon fibers.
6. The structure of the active carbon fibers, water treatment apparatus according to 5 is a nonwoven fiber diameter composed of activated carbon fibers 17～40Myuemu.
7. The structure of the active carbon fibers, water treatment apparatus according to the 5 diameter made of activated carbon fiber is woven or knitted fabric composed of fiber bundles of 100～600Myuemu.
8. The water treatment apparatus according to any one of 1 to 6, wherein the musty odor substance adsorbed on the adsorption element contains geosmin and / or 2-methylisoborneol.

According to the water treatment apparatus of the present invention, the adsorption element has a total pore volume of 30 Å or less that can effectively adsorb a musty odor substance that causes a musty odor in the water to be treated. Since it is 95% or more of the pore volume, the musty odor substance contained in the water to be treated can be effectively removed. In addition, the adsorption element has a very small water flow pressure loss coefficient of 200 mmAq · s / cm ² or less, and the water to be treated easily flows through the adsorption element in the adsorption process, so that a large amount of water such as tap water is adsorbed. Can be cleaned by. Further, when the adsorption element is a structure of activated carbon fibers, the contact efficiency with the water to be treated is high, and the ratio of the pore volume having a pore diameter of 30 Å or less, which is the adsorption site of the musty odor substance, is large, so that the adsorption rate is high. Sufficient mold odor substance removal performance can be obtained even when water is passed at high speed.

It is a schematic block diagram of the water treatment apparatus of one Embodiment of this invention. It is a figure which shows the example of the structure structure of the knitting used for the adsorption element. It is a figure which shows the example of the tissue structure of the woven fabric used for the adsorption element.

In the water treatment apparatus according to the present invention, water to be treated ^{on an adsorption element having a water flow pressure loss coefficient of 200 mmAq · s / cm 2} or less and a pore volume of 30 Å or less is 95% or more of the total pore volume. The treated water is allowed to flow through, and at least a musty odor substance (for example, 2-methylisoborneol (hereinafter, also referred to as “2-MIB”)) in the treated water is adsorbed on the adsorption element to discharge the treated water. The adsorption step, the dehydration step of ventilating the adsorption element with gas to remove the adhering water adhering to the adsorption element, and the adsorption step of ventilating the heating gas through the adsorption element to desorb at least the musty odor substance adsorbed on the adsorption element. The structure is such that the desorption step and the desorption step are repeatedly executed in order.

Further, the water treatment apparatus according to the present invention can be said to have the following configuration. That is, the water treatment device is connected to the treatment tank accommodating the adsorption element and the treatment tank, and the water to be treated is allowed to flow through the adsorption element in the treatment tank so that the adsorption element is at least moldy in the water to be treated. A water passage unit that adsorbs an odorous substance (for example, 2-methylisoborneol) and discharges treated water is connected to the adsorbent, and gas is ventilated through the adsorbent in the adsorbent to the adsorbent. A gas vent that removes adhering water and a heating gas that is connected to the treatment tank and ventilates the heating gas through the adsorption element in the treatment tank to desorb at least a musty odor substance adsorbed on the adsorption element. It is configured to have a ventilation part.

According to the above configuration, the water treatment apparatus according to the present invention does not require replacement of the adsorption element, and effectively removes 2-MIB, which is a causative substance of musty odor, contained in the water to be treated. Can be performed continuously.

Hereinafter, embodiments of the water treatment apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of an embodiment of a water treatment device according to the present invention. The water treatment device 100 of the present embodiment includes a plurality of treatment tanks 10 and 20 accommodating the adsorption elements 11 and 12, respectively, and a water treatment water introduction line L1 for introducing water to be treated into each of the treatment tanks 10 and 20. (Water flow section), gas supply line L5 (gas ventilation section) for supplying gas into each of the treatment tanks 10 and 20, and heating gas for supplying heating gas into each of the treatment tanks 10 and 20. It is provided with a supply line L3 (heated gas vent). Further, the water treatment device 100 of the present embodiment is a treated water lead-out line L2 (water passage) for discharging treated water which is water after being cleaned by the adsorption elements 11 and 12 in each of the treatment tanks 10 and 20. Flow section), a gas discharge line L4 for discharging the gas and heating gas supplied into each of the treatment tanks 10 and 20, and a circulation line that branches from the gas discharge line L4 and returns to the water to be treated line L1. It also has L6 (return route).

The water treatment device 100 of the present embodiment includes a plurality of treatment tanks 10 and 20 containing the adsorption elements 11 and 12. Then, by controlling each line L1 to L6 using a damper or a valve, and appropriately switching the route for introducing / discharging the water to be treated, the route for supplying / discharging the gas, and the route for supplying / discharging the heated gas. It is divided into a treatment tank for performing an adsorption step, a treatment tank for performing a dehydration step, and a treatment tank for performing a desorption step. As a result, the adsorption step can be continuously performed in any of the treatment tanks, and while the water to be treated is cleaned (adsorption step) by the adsorption element in any of the treatment tanks, the other In the treatment tank of No. 1, it is possible to regenerate the adsorption element (dehydration step and / or desorption step).

As shown in FIG. 1, the water treatment apparatus 100 of the present embodiment includes two treatment tanks 10 and 20 in which the adsorption elements 11 and 12 are housed, respectively. The number of adsorption elements 11 and 12 and treatment tanks 10 and 20 is not limited. In the adsorption step, dehydration step, and desorption step in each of the treatment tanks 10 and 20, which will be described later, the valves V1 to V12 are opened and closed to introduce / take out the water to be treated, supply / discharge gas, and heating. This is done by appropriately switching the gas supply / discharge route.

A water introduction line L1 to be treated is connected to each of the treatment tanks 10 and 20 via valves V7 and V8, respectively. Further, a treated water lead-out line L2 is connected to each of the treatment tanks 10 and 20 via valves V2 and V4, respectively.

The water treatment device 100 supplies the water to be treated into the treatment tanks 10 and 20 by the water introduction line L1 to be treated, and allows the water to be treated to flow through the adsorption elements 11 and 12 in the treatment tanks 10 and 20. Then, a treatment (adsorption step) for adsorbing at least an odorous substance (particularly a musty odorous substance) contained in the water to be treated is performed. When the water to be treated contains an organic substance other than the musty odor substance, the organic substance is also adsorbed in the adsorption step. As a result, the water to be treated is purified. The purified treated water is discharged to the outside of each of the treatment tanks 10 and 20 from the treated water lead-out line L4.

The adsorption elements 11 and 12 include a structure of activated carbon fibers. Since the activated carbon fiber uniformly has a large number of fine pores on the surface, it is possible to realize extremely high removal efficiency of the musty odor substance in the water to be treated. The structure of the activated carbon fiber can be obtained by processing the fiber as a raw material into a structure described later, carbonizing and activating it.

The raw material fiber is not particularly limited, but for example, phenol-based fiber, cellulosic-based fiber, acrylonitrile-based fiber, pitch-based fiber and the like are preferable. Among them, phenolic fibers are more preferable because the yield of activated carbon fibers after carbonization and activation is high and the fiber strength is strong.

The phenolic fiber is a phenolic fiber obtained by spinning a mixture of a phenol resin mixed with at least one compound (composite) selected from the group consisting of fatty acid amides, phosphate esters, and celluloses. It may be used as raw yarn. Thereby, the fiber strength can be further increased.

Examples of the structure of the activated carbon fiber include non-woven fabric, woven fabric, and knitting. Among these, non-woven fabrics, woven fabrics, and knits are preferable, and sheet-like structures formed of fiber bundles (for example, threads) such as woven fabrics and knits are more preferable. Since the knitted fabric or the woven fabric has a structure formed of threads as compared with the non-woven fabric in which the fibers are uniformly entwined, the activated carbon fibers in the adsorption elements 11 and 12 have an appropriately coarse and dense structure, and the activated carbon fibers are formed. It has a structure that arranges them regularly. Therefore, the water flow pressure loss coefficient of the adsorption elements 11 and 12 described later becomes small, and the details will be described later, but the water to be treated easily flows through the adsorption elements 11 and 12 in the adsorption step, that is, the adsorption elements 11 and 12 Since the water flow efficiency is improved, a large amount of water to be treated can be purified by the adsorption treatment. In addition, since the water to be treated easily passes through the adsorption elements 11 and 12, the amount of the adhering water adhering to the adsorption elements 11 and 12 is reduced, so that the dehydration efficiency of the adsorption elements 11 and 12 in the dehydration step is improved. You can also do it. Of the woven and knitted fabrics, knitting is more preferred. Compared to a woven fabric that has a grid-like structure due to the crossing of warp and weft yarns of the same length, a knitted fabric that has a structure in which threads are knitted in the vertical or horizontal direction is easier to obtain the above-mentioned coarse and dense structure. This is because the water flow pressure loss coefficient becomes smaller and the water flow efficiency and dehydration efficiency of the adsorption elements 11 and 12 are improved. The structure of the activated carbon fiber composed of the fiber bundle is not limited to the woven fabric and the knitting, and may be, for example, a sheet made by hardening the yarn.

When the structure of activated carbon fiber composed of fiber bundles is knitting, the structure of the knitting is classified into milling (rubber), tenjiku (flat), double-sided (pearl), and other knits. Horizontal knitting including tack and welt, denby knitting, chord knitting, atlas knitting, and knitting that combines these knitting structures (for example, double ridge knitting that combines milling and tacking) It can be mentioned, but it is not particularly limited. Among these, the milling cutter is preferable because it has an appropriate coarse and dense structure. An example of knitting is shown in FIG.

When the structure of the activated carbon fiber composed of the fiber bundle is a woven fabric, the structure of the woven fabric may include, but is not limited to, a single structure, a layered structure, a hair-attached structure, and an entangled structure. An example of a woven fabric is shown in FIG.

The thickness of the fiber bundle in the structure of the activated carbon fiber composed of the fiber bundle is preferably 100 μm to 600 μm. If it is less than 100 μm, the strength of the fiber bundle may decrease and the tissue structure may not be maintained as the adsorption elements 1 and 12, and if it exceeds 600 μm, a coarser and denser structure is formed. This is because the adsorption performance may be deteriorated. Here, the thickness of the fiber bundle can be obtained by measuring the diameters of a plurality of locations using an SEM photograph of the structure.

Further, when a yarn is used as a fiber bundle, the yarn may be a single yarn formed by one yarn having a predetermined count, a twisted yarn formed by twisting two or more single yarns, or the like. The thickness is not particularly limited as long as it fits within the thickness of the fiber bundle in the structure of the activated carbon fiber composed of the fiber bundle described above. The fineness of the raw material yarn can be assumed to be 40th to 5th single yarn in cotton fineness, or twisted yarn (20th twin yarn, etc.) corresponding to the fineness, but the yarn diameter shrinks due to carbonization and activation. Therefore, the fineness of the raw material may be any fineness within the range of the yarn diameter suitable for the structure of the activated carbon fiber.

The structure of the activated carbon fibers used in the adsorption elements 11 and 12 has a physical characteristic that the pore volume of pores having a pore diameter of 30 Å or less is 95% or more of the pore volume of all pores. The inventor of the present application has conducted extensive research on what kind of physical properties the adsorption elements 11 and 12 need to have in order to effectively remove 2-MIB, which is the cause of the musty odor in the water to be treated. As a result, it is greatly related to the ratio of the pores having a predetermined diameter of the adsorption elements 11 and 12, and if the pore volume of the pores having a pore diameter of 30 Å or less is 95% or more of the pore volume of all the pores, 2 Since it has been found that -MIB can be effectively adsorbed and tap water without offensive odor such as musty odor can be obtained, it is a feature of the water treatment apparatus 100 according to the present invention.

^{The pore volume V (cm 3} / g) of the pores having a pore diameter of 30 Å or less and the pore volume Vp (cm ³ / g) of all the pores can be measured by the measuring method described later. Then, from the values of V and Vp, the ratio (%) of Vp to V can be obtained from the formula: (V / Vp) × 100.

Further, the structure of the activated carbon fiber used for the adsorption elements 11 and 12 has a water flow pressure loss coefficient of 200 mmAq · s / cm ² or less as its physical properties. The water flow pressure loss coefficient indicates the magnitude of the pressure loss when the water to be treated passes through the adsorption elements 11 and 12, and the smaller the water flow pressure loss coefficient, the lower the pressure loss during water flow, and the water to be treated flows. Show that it is easy. In the water treatment apparatus 100 according to the present invention, since the water flow pressure loss coefficient of the adsorption elements 11 and 12 ^{is as small as 200 mmAq · s / cm 2} or less, more water to be treated is applied to the adsorption elements 11 and 12 in the adsorption step. It can be passed through and adsorbed. This is particularly effective when purifying purified water such as tap water. In order to purify purified water such as tap water, it is necessary to pass a large amount of water of several thousand to several hundred thousand tons per day through the adsorption elements 11 and 12 at high speed for adsorption treatment. In the water treatment device 100, since the water flow efficiency of the adsorption elements 11 and 12 is improved, it is possible to satisfactorily treat purified water such as tap water. Moreover, as described above, since the adsorption elements 11 and 12 are structures of activated carbon fibers, the contact efficiency with the water to be treated is high, and the ratio of the pore volume having a pore diameter of 30 Å or less, which is an adsorption site for a musty odor substance. Therefore, the adsorption speed is high, and sufficient mold odor substance removal performance can be obtained even when water is passed at high speed. The water flow pressure loss coefficient of the adsorption elements 11 and 12 can be measured by a measuring method described later.

The physical properties of the activated carbon fiber structure used for the adsorption elements 11 and 12 other than the above are not particularly limited, but the BET specific surface area is 900 m in consideration of the adsorption amount, strength, cost, etc. of the adsorption element. is preferably ² / ^{g~2500m 2} / g, it is preferably the total pore volume is 0.4cm ³ /g~0.9cm ³ / g. The BET specific surface area can be measured by a measuring method described later.

In the present embodiment, the adsorption elements 11 and 12 are configured to include a structure of activated carbon fibers, but ^{the pore volume having a water flow pressure loss coefficient of 200 mmAq · s / cm 2} or less and a pore diameter of 30 Å or less. Is a material containing 95% or more of the total pore volume, and is not limited to those containing a structure of activated carbon fibers. For example, an adsorption element having an increased outer surface area may be used by adsorbing powdered activated carbon or zeolite at 30 Å or less on a carrier of a non-woven fabric, a woven fabric, or a knitted fabric (which itself has no adsorptive capacity). Further, other configurations may be used.

In the present embodiment, the substance to be treated contained in the water to be treated is described by taking 2-methylisoborneol (2-MIB) as an example, but the following organic substances are also described as the water of the present embodiment. The processing device 100 has a similar removing effect. For example, aldehydes such as formaldehyde, acetaldehyde, propionaldehyde, achlorine, ketones such as methyl ethyl ketone, diacetyl, methyl isobutyl ketone, acetone, 1,4-dioxane, 2-methyl-1,3-dioxolane, 1,3-dioxolane. , Ethers such as tetrahydrofuran, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, alcohols such as ethanol, n-propyl alcohol, isopropyl alcohol, butanol, glycols such as ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol , Organic acids such as acetic acid and propionic acid, phenols, aromatic organic substances such as toluene, xylene and cyclohexane, ethers such as diethyl ether and allylglycidyl ether, ditrils such as acrylonitrile, dichloromethane, 1,2-dichloroethane , Chlorine organic substances such as trichloroethylene and epichlorohydrin, organic substances of N-methyl-2-pyrrolidone, dimethylacetamide, N, N-dimethylformamide, polychlorinated dibenzoparadioxin (PCDD), polychlorinated dibenzofuran (PCDF), Dioxins such as dioxin-like polychlorinated biphenyls (DL-PCB), tetracyclines, oseltamivir, oseltamivir phosphate, antibiotics such as bezafibrate and triclosan, antilipidemia components such as bezafibrate and phenofibrate, diclofenac, salicylic acid, acetamino Examples include anti-fever and pain-relieving agent components such as fen, anti-epileptic agent components such as carbamazepine, fumin substances such as fumic acid and fluboic acid, hexamethylenetetramine, and diosmine. The substance to be treated contained in the water to be treated by the water treatment apparatus 100 of the present embodiment may be one or more of these.

In FIG. 1, a gas supply line L5 and a heating gas supply line L3 are connected to the treatment tanks 10 and 20 via valves V5 and V6, respectively. The gas supply line L5 and the heating gas supply line L3 have a common part on the downstream side connected to the treatment tanks 10 and 20, and are branched on the upstream side, and have valves V11 and V9, respectively. ing. Further, gas discharge lines L4 are connected to the treatment tanks 10 and 20 via valves V1 and V3.

After the adsorption step, the water treatment apparatus 100 supplies gas into the treatment tanks 10 and 20 by the gas supply line L5 and causes the adsorption elements 11 and 12 in the treatment tanks 10 and 20 to be ventilated. A process (dehydration step) for removing the adhering water adhering to the adsorption elements 11 and 12 is performed. The adsorbed elements 11 and 12 are brought into a dry state by removing the adhering water by the flow of gas, so that the subsequent desorption of the musty odor substance by the heating gas can be facilitated. When an organic substance other than the musty odor substance is also adsorbed on the adsorption elements 11 and 12, the organic substance is also desorbed.

The gas supplied into each of the treatment tanks 10 and 20 in the dehydration step may include, for example, air, nitrogen, an inert gas, water vapor and the like, but is not particularly limited. The adhering water dehydrated in the dehydration step is discharged to the outside of each of the treatment tanks 10 and 20 from the gas discharge line L4 together with the gas. At this time, the adhering water is returned from the circulation line L6 to the water to be treated introduction line L1 by the opening operation of the valve V12, and is in the treatment tanks 10 and 20 to be passed through the adsorption elements 11 and 12 again as the water to be treated. Introduced in. As a result, the number of steps can be omitted, which is efficient.

After the dehydration step, the water treatment apparatus 100 supplies the heating gas into the treatment tanks 10 and 20 by the heating gas supply line L3 to ventilate the heating gas to the adsorption elements 11 and 12 in the treatment tanks 10 and 20. As a result, a process (desorption step) of removing at least a musty odor substance adsorbed on each of the adsorption elements 11 and 12 is performed. Examples of the heating gas supplied into the treatment tanks 10 and 20 in the desorption step include air heated to 100 to 400 ° C., nitrogen, an inert gas, water vapor, and the like, but are not particularly limited. The musty odor substance desorbed in the desorption step is discharged to the outside of each of the treatment tanks 10 and 20 from the gas discharge line L5 as a desorption gas (exhaust gas) together with the heating gas. When an organic substance other than the musty odor substance is also desorbed, the desorbed gas also includes the organic substance.

The desorption gas discharged from each of the treatment tanks 10 and 20 in the desorption step is, for example, a commonly used gas such as a direct combustion device, a catalytic oxidation device, a combustion device such as a heat storage combustion device, a solvent recovery device, and a cooling condensing device. A processing device may be appropriately selected for secondary processing.

As described above, in the water treatment apparatus 100 of the present embodiment described with reference to FIG. 1, components such as a fluid transport means such as a pump and a fan and a fluid storage means such as a storage tank are not shown for the sake of brevity. , These components may be arranged at appropriate positions as needed.

According to the water treatment device 100 having the above configuration, the adsorption elements 11 and 12 have a pore volume of 30 Å or less that can effectively adsorb 2-MIB, which is a cause of the musty odor in the water to be treated. Since it is 95% or more of the volume, the musty odor substance (2-MIB) in the water to be treated can be effectively removed. In addition, the adsorption elements 11 and 12 have a ^{very small water flow pressure loss coefficient of 200 mmAq · s / cm 2} or less, and the water to be treated easily flows through the adsorption elements 11 and 12 in the adsorption step. A large amount of water can be purified by adsorption treatment. Moreover, since the adsorption elements 11 and 12 are structures of activated carbon fibers, the contact efficiency with the water to be treated is high, and the proportion of the pore volume having a pore diameter of 30 Å or less, which is an adsorption site for a musty odor substance, is large. The adsorption rate is high, and sufficient removal performance of musty odor substances can be obtained even when water is passed at high speed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment because the above-described embodiment is exemplary in all respects and is not restrictive. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope equivalent to the description of the scope of claims. Various changes can be made as long as they do not deviate from the purpose.

For example, in the above-described embodiment, the water treatment apparatus 100 includes a treatment tank in which adsorption elements are housed in a plurality of treatment tanks (two in FIG. 1), and a treatment tank for performing an adsorption step and a treatment tank for performing a dehydration step and a desorption step. By alternately switching the above, the adsorption process by the adsorption element is continuously performed. However, by making the adsorption element rotatable and configuring the water treatment device 100 so that at least the portion of the adsorption element that has adsorbed the musty odor substance in the adsorption step is moved to the dehydration step and the desorption step by the rotation of the adsorption element. Also, as the water treatment device 100, it is possible to continuously perform the adsorption step by the adsorption element.

Further, it is not always necessary to configure the water treatment device 100 so that the adsorption step by the adsorption element is continuously performed, and the treatment tank is one, and the water to be treated is supplied to the treatment tank during the dehydration step and the desorption step. The water may be temporarily stopped and stored in a tank or the like, and the water to be treated temporarily stored in the adsorption step after the desorption step may also be adsorbed.

Examples of the present invention will be shown below, and the present invention will be described in more detail. The present invention is not limited to the following examples.

[Example 1]
An adsorption element (thickness 150 mm, weight 2 kg) in which a sheet-like structure of activated carbon fiber, which is a phenolic fiber and is a non-woven fabric having a fiber diameter of 24 μm and a specific surface area of 1950 m ^{2 / g, is laminated is produced, and a damper similar to that in FIG. 1 is produced.} It was installed in a switching type water treatment device. The ratio of the pore volume of the pores having a pore diameter of 30 Å or less to the pore volume of the total pores of the adsorption element was 95% or more, and the water flow pressure loss coefficient of the adsorption element was 140 mmAq · s / cm ² . ..

In the adsorption step, water to be treated (water temperature 30 ° C.) containing 20 ng / l 2-MIB was introduced into the treatment tank at a supply amount of ^{48 m 3 / h per unit time for 14 hours.} In the next dehydration step, 0.1 MPa of saturated steam was supplied to the treatment tank to remove the water adhering to the adsorption element. In the next desorption step, 0.1 MPa of superheated steam (250 ° C.) was supplied to the treatment tank to desorb the 2-MIB adsorbed on the adsorption element. The desorbed water vapor containing 2-MIB was liquefied and condensed in a cooler and recovered as concentrated water.

After the desorption step was completed, the cycle of shifting to the adsorption step was carried out a plurality of times, and the adsorption step was carried out for a total of 100 hours. The outlet 2-MIB concentration after the adsorption step was carried out for 100 hours was 1 ng / l or less as shown in Table 1, and 2-MIB was effectively removed. Further, as shown in Table 1, the pump power used in the adsorption step was 2.8 KW / h, and the amount of water vapor used in the desorption step was 2.9 kg / h.

[Example 2]
Milled knitting using yarn with a cotton fineness of 10th using phenolic fibers is carbonized and activated, and the yarn (fiber bundle) with a yarn diameter (thickness of the fiber bundle) of 400 μm has a specific surface area of 1950 m ² / g. An adsorption element (thickness 150 mm, weight 3 kg) in which a sheet-like structure of activated carbon fibers was laminated was produced and installed in a damper switching type water treatment device similar to FIG. The ratio of the pore volume of the pores having a pore diameter of 30 Å or less to the pore volume of all the pores of the adsorption element was 95%, and the water flow pressure loss coefficient of the adsorption element was 85 mmAq · s / cm ² .

In the adsorption step, water to be treated (water temperature 30 ° C.) containing 20 ng / l 2-MIB was introduced into the treatment tank for 17 hours with a supply amount of ^{48 m 3 / h per unit time.} In the next dehydration step, 0.1 MPa of saturated steam was supplied to the treatment tank to remove the water adhering to the adsorption element. In the next desorption step, 0.1 MPa of superheated steam (250 ° C.) was supplied to the treatment tank to desorb the 2-MIB adsorbed on the adsorption element. The desorbed water vapor containing 2-MIB was liquefied and condensed in a cooler and recovered as concentrated water.

After the desorption step was completed, the cycle of shifting to the adsorption step was carried out a plurality of times, and the adsorption step was carried out for a total of 100 hours. The outlet 2-MIB concentration after the adsorption step was carried out for 100 hours was 1 ng / l or less, and 2-MIB was effectively removed. Further, as shown in Table 1, the pump power used in the adsorption step was 1.7 KW / h, and the amount of water vapor used in the desorption step was 2.4 kg / h.

[Comparative Example 1]
An adsorption element (thickness 150 mm, weight 80 kg) in which 8/32 mesh granular activated carbon was laminated was prepared and installed in a water treatment device without a damper switching method. The ratio of the pore volume of the pores having a pore diameter of 30 Å or less to the pore volume of the total pores of the adsorption element was 80% or less, and the water flow pressure loss coefficient of the adsorption element was 80 mmAq · s / cm ² . ..

In Comparative Example 1, water to be treated (water temperature 30 ° C.) containing 20 ng / l 2-MIB was continuously introduced into the treatment tank at a supply amount of ^{48 m 3 / h per unit time for 100 hours to perform an adsorption step.} .. The outlet 2-MIB concentration after the adsorption step was carried out for 100 hours was 1 ng / l or less, and 2-MIB was effectively removed. Further, as shown in Table 1, the pump power used in the adsorption step was 1.6 KW / h.

[Comparative Example 2]
An adsorption element (thickness 150 mm, weight 12 kg) in which 8/32 mesh granular activated carbon was laminated was produced and installed in a damper switching type water treatment device similar to that in FIG. The ratio of the pore volume of the pores having a pore diameter of 30 Å or less to the pore volume of the total pores of the adsorption element was 80% or less, and the water flow pressure loss coefficient of the adsorption element was 80 mmAq · s / cm ² . ..

In the adsorption step, water to be treated (water temperature 30 ° C.) containing 20 ng / l 2-MIB was introduced into the treatment tank at a supply amount of ^{48 m 3 / h per unit time for 15 hours.} In the next dehydration step, 0.1 MPa of saturated steam was supplied to the treatment tank to remove the water adhering to the adsorption element. In the next desorption step, 0.1 MPa of superheated steam (250 ° C.) was supplied to the treatment tank to desorb the 2-MIB adsorbed on the adsorption element. The desorbed water vapor containing 2-MIB was liquefied and condensed in a cooler and recovered as concentrated water.

After the desorption step was completed, the cycle of shifting to the adsorption step was carried out a plurality of times, and the adsorption step was carried out for a total of 100 hours. The outlet 2-MIB concentration after the adsorption step was carried out for 100 hours was 1 ng / l or less, and 2-MIB was effectively removed. Further, as shown in Table 1, the pump power used in the adsorption step was 1.6 KW / h, and the amount of water vapor used in the desorption step was 36 kg / h.

The physical characteristics of the adsorption elements in Examples and Comparative Examples were measured by the following methods. The 2-MIB concentration in the water at the inlet and outlet of the treatment tank was analyzed and measured by the solid phase microextraction (SPME) -GC / MS method.

-Pore volume V with a pore diameter of 30 Å or less
The amount of nitrogen adsorbed on the sample when the relative pressure was raised in the range of 0 to 0.95 was measured at multiple points, and the results were measured by the MP method in the analysis range of 0 to 30 Å. The analysis was performed under the condition of J, and the pore volume V (cm ³ / g) of 30 Å or less was calculated from the result of the pore size distribution number table at the time of adsorption.

・ Pore volume Vp of all pores
The total pore volume Vp (cm ³ / g) was measured by the gas adsorption method of nitrogen gas at a relative pressure of 0.95.

-BET specific surface area The BET specific surface area (m ² / g) is the nitrogen to the sample when the relative pressure is increased in the range of 0.0 to 0.15 under the boiling point (-195.8 ° C.) atmosphere of liquid nitrogen. The amount of adsorption was measured at several points, and the surface area per unit mass of the sample was determined by BET plotting.

- passing the water pressure loss coefficient through pressure loss coefficient (mmAq · s / cm ^2), compared adsorption element filled in thickness 150 mm, at the time of Rohm & pure water through water line speed 3 mm / s relative to the adsorption element The pressure loss (mmAq) of the adsorption element was measured, and the value was obtained by dividing the value by the wind velocity and the thickness.

From the results in Table 1, Comparative Example 1 requires about 27 to 40 times the weight of the adsorption element in order to obtain the same level of 2-MIB removal performance as in Example 1 and Example 2. It is necessary to replace it with a new one every 100 hours. Further, even in Comparative Example 2 installed in the same damper switching type water treatment device as in FIG. 1, in order to obtain the same level of 2-MIB removal performance as in Example 1 and Example 2, it is about four times as much. It can be seen that 6 times the weight of the adsorption element is required. Therefore, in Example 1 and Example 2, it is confirmed that the removal performance of 2-MIB is extremely effective as compared with Comparative Example 1 and Comparative Example 2.

Further, from the results in Table 1, in Comparative Example 2, the amount of superheated steam (heating gas) required for desorbing 2-MIB from the adsorption element (desorption steam amount) was higher than that in Example 1 and Example 2. , 12 times or more is required, and the concentration ratio is extremely low by that amount, 12 times or more of concentrated water is discharged, and it can be seen that extra processing energy for concentrated water is required. Therefore, in Example 1 and Example 2, it is confirmed that the renewable energy for regenerating the adsorbent element can be significantly reduced and the processing energy for concentrated water can be significantly reduced as compared with Comparative Example 2.

Further, from the results in Table 1, it can be seen that the amount of desorbed water vapor required for desorbing 2-MIB from the adsorption element is lower and the concentration ratio is lower in Example 2 than in Example 1. Therefore, it is confirmed that in the second embodiment, the renewable energy for regenerating the adsorbent element can be reduced and the processing energy of the concentrated water can be reduced as compared with the first embodiment. Moreover, it can be seen that in the second embodiment, the electric power required to allow the water to be treated to flow through the adsorption element is lower than that in the first embodiment, and the energy required for the desorption treatment can be reduced. Therefore, in the second embodiment, it is confirmed that the water treatment can be performed with energy saving (low cost) in the entire water treatment apparatus as compared with the first embodiment.

The water treatment device according to the present invention shall be suitably used for a device for removing musty odor substances from the purified water of a water purification plant, in addition to wastewater from various factories and research facilities, leachate of a final disposal site, and groundwater. Can make a great contribution to the industrial world.

10 Treatment tank 11 Adsorption element 12 Adsorption element 20 Treatment tank 100 Water treatment device L1 Water to be treated introduction line (water flow section)
L2 treated water discharge line (water distribution department)
L3 heating gas supply line (heating gas ventilation part)
L4 gas discharge line L5 gas supply line (gas vent)
L6 return line (return route)
V1 to V12 valves

Claims (4)

A treatment tank containing an adsorption element containing an activated carbon fiber structure, and
A water flow section connected to the treatment tank, allowing water to be treated to flow through the adsorption element in the treatment tank, adsorbing at least a musty odor substance in the water to be treated by the adsorption element, and discharging the treated water. ,
A gas aeration unit connected to the treatment tank and aerated gas through the adsorption element in the treatment tank to remove adhering water adhering to the adsorption element.
It is provided with a heating gas aeration unit which is connected to the treatment tank and allows the adsorption element in the treatment tank to ventilate a heating gas to desorb at least a musty odor substance adsorbed on the adsorption element.
The adsorption element has a water flow pressure loss coefficient of 85 mm Aq · s / cm ² or less and a pore volume of 30 Å or less in a pore volume of 95% or more of the total pore volume.
The water treatment apparatus, wherein the structure of the activated carbon fiber is a knitted fabric made of activated carbon fibers and composed of a fiber bundle having a diameter of 100 to 600 μm. The water treatment apparatus according to claim 1, further comprising a return route for allowing the adsorbed water removed from the adsorption element to flow through the adsorption element again. The water treatment apparatus according to claim 1 or 2, wherein the ventilation direction in which the heating gas is ventilated and the flow direction in which the water to be treated is allowed to flow through the adsorption element are opposite to each other. The water treatment apparatus according to any one of claims 1 to 3 , wherein the musty odor substance adsorbed on the adsorption element contains geosmin and / or 2-methylisoborneol.

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