JP2006192427A - Water treatment method and apparatus using photocatalyst - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water treatment method and apparatus efficiently decomposing and decolorizing organic matter in water to be treated using a photocatalyst. <P>SOLUTION: Textile 1 carrying the photocatalyst and made of nonwoven fabric is set in a concrete water pit 4 for letting water to be treated flow in from a flow-in port 5. Hydroxy radicals are formed by the photocatalyst by the sunlight, while organic matters in the water to be treated are efficiently decomposed and decolorized. The decolorized treated water is discharged from a discharge port 6. By reciprocating or vibrating the entire textile 1 carrying the photocatalyst and made of nonwoven fabric in water, an amount of water coming into contact with the photocatalyst in a unit time can be greatly increased to heighten the treating efficiency. The treating efficiency can be further heightened by a method of directly run down the water to be treated onto a nonwoven fabric pleat structural body 2, and by a method of sprinkling suspended water to be treated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water treatment method and apparatus using a photocatalyst, and in particular, when treating water to be treated such as manure sewage from livestock excreta, organic substances in the water to be treated are effectively decomposed by using a photocatalyst. The present invention relates to a water treatment method and apparatus capable of decolorization.

  Livestock production in recent years is faced with a severe situation due to the expansion of breeding scale, the decrease of bearers, and the progress of aging, and there are management bodies in which proper disposal of livestock excreta is difficult. On the other hand, problems related to the local living environment have also arisen. Conventionally, manure sewage due to livestock excrement has been in a soil infiltration state and has not been properly treated.

  On July 28, 1999, the “Law Concerning Appropriate Management of Livestock Excretion and Promotion of Use” was promulgated and came into effect on November 1, 1999. Livestock farmers require sound management that is in harmony with the local environment, and they are properly managed with storage tanks made of concrete and water shielding sheets so that livestock excretion does not flow into the river and surrounding farmland due to wind and rain, or penetrate underground. In addition, it was obliged to develop a facility to improve the treatment of livestock excreta. Ponds and moat storage were banned due to the accumulation of livestock dung and sewage.

  A 5-year grace period has been set for some of the structural equipment and management methods for farmers who do not have facilities that can meet the management standards for livestock excretion in order to consider the time required for facility maintenance. . From November 1, 2004, the standards for the structural equipment of the facility and the management of livestock excrement in the management facility were applied.

  Manure sewage from livestock excrement is performed by a method that combines biological treatment, aeration treatment, and membrane separation treatment, but even if it reaches the discharge standard value, it is discharged because the final treated water is brownish. Is often hindered.

  The main cause of coloring of manure wastewater is organic humic substances (fulvic acid, humic acid, etc.). In pig farming, the coloring of urine from female pigs is particularly intense.

  As a method for decomposing and decolorizing organic matter, there is a treatment method using a photocatalyst that can be used repeatedly. According to this method, it is only necessary to irradiate near ultraviolet rays, and much energy is not required. There have been proposed a pond purification method (Patent Document 1) using a disc-shaped, flat plate or tubular material carrying a photocatalyst and a method (Patent Document 2) for purifying water using a tub carrying a photocatalyst. However, in these proposals, since the photocatalyst is supported on the filler, the inside of the tank, the particles, the plate, and the soot, there is a problem that the contact efficiency between water and the photocatalyst is poor and the decomposition rate through the photocatalyst is slow. It was.

  Patent Document 3 proposes an apparatus that pulls up after being continuously immersed in water to be treated by rotating a disk-shaped support. In this apparatus, only a substance that is easily adsorbed by the disk in water is decomposed, and a substance that is difficult to be adsorbed by the disk in water is not decomposed.

  Furthermore, regarding agriculture, a method for treating livestock wastewater that uses a photocatalyst carrier for decolorization (Patent Literature 4, Patent Literature 5), or a treatment method using a photocatalyst in which an agricultural liquid is carried on a porous body (Patent Literature 6). ) Is proposed, but there are problems that the decomposition rate is slow and the carrier is expensive.

In closed lakes, swamps, scenic ponds, viewing ponds, etc., water pollution is still more serious than rivers and oceans. Even now, there is a problem of water pollution due to industrial wastewater such as manufacturing industry and fishery industry, and colored wastewater containing organic coloring components of ink and dye.
Japanese Patent Laid-Open No. 11-151486 Japanese Patent Laid-Open No. 11-104629 Japanese Patent Laid-Open No. 10-202257 JP 2002-11483 A Japanese Patent Laid-Open No. 2003-24957 JP 2004-82095 JP

  In view of the present situation, the object of the present invention is to use a non-woven fabric carrying a photocatalyst, and particularly to use it in a state of being suspended in water, so that it requires less energy and keeps water treatment costs low. On the other hand, by increasing the efficiency of contact between the water to be treated and the photocatalyst, a water treatment method and apparatus capable of efficiently decomposing organic matter in manure sewage by livestock excrement at a high rate and enabling decolorization. It is to provide.

  As a result of intensive studies by the present inventors in order to solve the above-mentioned problems, the photocatalytic reaction that decomposes organic substances present in the water to be treated is such that hydroxy radicals generated on the surface of the photocatalyst react with organic substances on the surface of the nonwoven fabric. I focused on what happened. Furthermore, in order to increase the surface area of the immobilized photocatalyst, it is preferable to use a non-woven fabric carrying a photocatalyst, and in addition, to increase the amount of water that contacts the photocatalyst-supporting non-woven fabric surface per unit time. Was found to be preferable.

  Based on this elucidation result, the first means according to the present invention for solving the above-mentioned problems is a processing method for decomposing and decolorizing organic matter in the water to be treated, which carries a photocatalyst in the water to be treated. A water treatment method using a photocatalyst characterized in that the non-woven fabric is immersed and irradiated with light (in particular, light containing ultraviolet rays) to decolorize by decomposing organic matter in the water to be treated. is there.

  The second means is the water treatment method using the photocatalyst according to the first means, wherein the non-woven fabric carrying the photocatalyst is reciprocated in a state of being suspended in the water to be treated. .

  A third means is a water treatment method using a photocatalyst according to the first means, characterized in that a nonwoven fabric carrying the photocatalyst is vibrated in the water to be treated.

  A 4th means is a water treatment method using the photocatalyst in any one of the 1st-3rd means characterized by having a stirring means which stirs the said to-be-processed water.

  5th means used the photocatalyst in any one of the 1st-4th means characterized by having the sprinkling means which sprinkles the said to-be-processed water on the cloth of the nonwoven fabric which carry | supported the said photocatalyst. Water treatment method.

  Sixth means is that the irradiation light containing ultraviolet rays is at least one light selected from the group consisting of sunlight, fluorescent lamp, black light, germicidal lamp, mercury lamp, halogen lamp and incandescent lamp light. A water treatment method using the photocatalyst according to any one of the first to fifth means.

  Seventh means is that the treated water is selected from the group consisting of wastewater containing manure wastewater from livestock excreta, domestic wastewater, wastewater treatment plant wastewater, wastewater treatment facility wastewater, agricultural wastewater, golf course wastewater, and colored wastewater. The water treatment method using a photocatalyst according to any one of the first to sixth means, wherein the water treatment method is at least one kind.

  The eighth means is that the non-woven fabric carrying the photocatalyst is made of at least one fiber selected from the group consisting of polyester, polyolefin, and polyamide, the photocatalyst powder is exposed on the fiber surface, and the non-woven fabric is made of non-woven fabric. A water treatment method using a photocatalyst according to any one of the first to seventh means, which is a structure processed into a fabric of 1. For example, polyethylene terephthalate can be used as the polyester constituting the fiber, polypropylene or polyethylene can be used as the polyolefin, and various nylons can be used as the polyamide.

  A ninth means is the water treatment method using a photocatalyst according to any one of the first to eighth means, wherein the nonwoven fabric carrying the photocatalyst is a pleated structure.

  A tenth means is a water treatment method using a photocatalyst according to any one of the first to ninth means, wherein the photocatalyst is made of titanium oxide.

  Moreover, the water treatment apparatus using the photocatalyst according to the present invention has a water tank into which treated water is introduced and discharged, and a nonwoven fabric carrying a photocatalyst immersed in the treated water in the water tank. Consists of features.

  In the water treatment apparatus using the photocatalyst, the structure in which the water tank is divided into a plurality of small water tanks into which the water to be treated is sequentially flowed can be employed.

  The water treatment apparatus using the photocatalyst preferably further employs a structure having means for reciprocating or vibrating the non-woven fabric carrying the photocatalyst in the water to be treated.

  Furthermore, also in the water treatment apparatus using this photocatalyst, it is preferable that the nonwoven fabric carrying the photocatalyst is composed of a pleated structure.

  According to the water treatment method and apparatus using a photocatalyst according to the present invention, a non-woven fabric carrying a photocatalyst that can be installed in water is less expensive than a porous body or the like carrying a conventional photocatalyst. , Processing costs can be reduced.

  In addition, the non-woven fabric carrying the photocatalyst can be reciprocated in a state of being suspended in water using a motor having a very weak torque, or can be vibrated in water. Contact efficiency with the water to be treated can be dramatically improved. And it becomes possible to decompose and decolorize organic matter in a short time with sunlight.

  Therefore, proper treatment of manure wastewater from livestock excrement from livestock farmers facing severe conditions due to the expansion of breeding scale, reduction of bearers and aging, can be performed promptly without pressure on management. Healthy management in harmony with the local environment will be possible.

Embodiments of the present invention will be described below with reference to the drawings.
The non-woven fabric carrying the photocatalyst used in the present invention may be a structure processed into a cotton shape or a pleated structure in order to improve contact with water. FIG. 1 illustrates an example in which a nonwoven fabric 1 carrying a photocatalyst is formed into a pleated structure 2. As the photocatalyst, titanium oxide, particularly titanium oxide powder is typically used.

  This non-woven fabric pleated structure 2 carrying a photocatalyst is a non-woven fabric 1 carrying a photocatalyst processed into a pleated shape (FIGS. 1 and 2). In order to improve the contact with water on the side surface, a water passage hole 11 may be formed (FIG. 2). The planar shape of the pleated structure 2 is not particularly limited, but considering the case where a large number of the pleated structures 2 are laid, for example, a rectangular shape as shown in FIG. 3 or a square shape is preferable.

  As a water treatment facility using a non-woven fabric 1 carrying a photocatalyst according to an embodiment of the present invention (for example, one configured as a pleated structure 2 as described above), for example, as shown in FIGS. Can be configured. The water treatment facility 21 is made of, for example, concrete (for example, configured in the form of a concrete water tank 4) and has a structure in which the treated water 3 that has been introduced does not permeate underground. The water treatment facility 21 includes an inlet 5 for treated water and an outlet 6 for treated water, and a plurality of small water tanks partitioned by a partition wall 22, that is, upstream water tanks 4a to downstream water tanks 4b, 4c, The partition walls 22 are provided with communication holes 23a, 23b, 23c, and 23d that function as weirs having steps in order so as to sequentially flow down to 4d and 4e. The inflow port 5, the communication holes 23a, 23b, 23c, 23d, and the discharge port 6 are arranged at alternate positions as shown in FIG. 5 when seen in a plan view, and the water to be treated is in each of the water tanks 4a, 4b, 4c. 4d and 4e naturally flow little by little and then discharged from the outlet 6.

  When the water to be treated is introduced from the inflow port 5, when it passes through the photocatalyst-supporting nonwoven fabric 1 (for example, the nonwoven fabric pleated structure 2) in the flow path, it comes into contact with the titanium oxide photocatalyst and contains light containing ultraviolet rays (in particular, the The organic matter in the water to be treated is decomposed by the light), and the treated water is discharged from the outlet 6 (FIGS. 4 and 5).

  In such a water treatment facility 21, it is preferable that the photocatalyst-supported nonwoven fabric 1 is reciprocated in a state of being suspended in water to increase the contact efficiency with the water to be treated and to increase the treatment efficiency. For example, as shown in FIGS. 6 and 7, the rotational motion of the motor 8 with the disk 9 can be converted into a reciprocating motion via the connecting rod 7 and the pulley 10 to the nonwoven fabric 1. A crank mechanism that converts the rotational movement of the disk 9 into a reciprocating movement may be provided between the disk 9 attached to the motor 8 and the connecting rod 7 (not shown). The contact efficiency with water can be increased by reciprocating the non-woven fabric 1 (for example, non-woven pleated structure 2) carrying the photocatalyst in a floating state in water. As a method for increasing the contact efficiency with water, the nonwoven fabric 1 carrying a photocatalyst may be vibrated in a floating state. In this case, a reciprocating motion or vibration can be performed using a small motor using a solar cell as a power source. Furthermore, a reciprocating motion and vibration can be performed using wind force by setting sail on the nonwoven fabric 1 carrying the photocatalyst (particularly, the highly rigid nonwoven fabric pleated structure 2).

  Further, although not shown, at least one of the water tanks 4a, 4b, 4c, 4d, and 4e may be provided with a stirring means for stirring the water to be treated.

  Furthermore, as a flow-down water treatment facility 24 using the nonwoven fabric 1 carrying the photocatalyst according to the embodiment of the present invention (for example, the pleated structure 2 as described above), for example, FIG. Can be configured as shown. The nonwoven fabric pleated structure 2 used here does not have a hole for water passage. The flow-down water treatment facility 24 includes an inlet 5 for treated water and an outlet 6 for treated water, and each stage is arranged such that the treated water flows down on the nonwoven fabric pleated structure floated on the upstream water tank 25a. Has a water guide portion 26 having a large number of holes. The aquarium has a level difference, functions as a weir at the height of the hole, and is arranged to flow down to the downstream aquariums 25b, 25c, 25d, 25e, and flows naturally. It is discharged from the outlet 6. Since the water to be treated passes through the non-woven pleated structure carrying the photocatalyst, the contact efficiency with the photocatalyst is improved in each stage.

  The falling water treatment facility 24 can be made of metal or plastic in addition to concrete.

  Furthermore, as another apparatus form of the present invention, a vertical water treatment using a non-woven fabric 1 carrying a photocatalyst (for example, one configured as a pleated structure 2 as described above) is shown in FIG. 9, for example. It can be configured as follows. The nonwoven fabric pleated structure 2 used here does not have a hole for water passage. The circulation pump 32 and the nonwoven fabric pleat structure 2 are fixed to the fixing rod 31 in a state of floating on the water surface. Although this apparatus form is the structure which comprises a sprinkling means, the to-be-processed water is passed through the water intake pipe 34 from the water intake port 33 by the circulation pump 32, and from the upper part of the nonwoven fabric pleat structure 2 in the shower state (shower 37) from the water discharge port 35. Sprinkle water. In a lake where it is difficult to secure a power source, a solar cell 36 can be used as the power source of the circulation pump 32. In the technique of the present application, the above-described reciprocating means, vibration, stirring means, and watering means can be arbitrarily combined for the purpose of increasing the contact efficiency between the photocatalyst and the water to be treated.

  The non-woven pleated structure 2 carrying a photocatalyst in a suspended pool, pond or lake is floated on the surface of the water with a fixing gutter 31, and water to be treated suspended by a circulation pump 32 fixed to the gutter is sprinkled from above the non-woven pleated structure. This not only removes suspended matter, but also improves the contact efficiency between the photocatalyst and the pollutant, oxidizes organic substances in the water, and improves the water quality. Water quality is improved.

Example 1 and Comparative Example 1
As colored water to be treated, 0.8 L of an aqueous solution of blue methylene blue having a concentration of 50 mg / L was used. In the examples, a small plastic pad (internal volume: 346 mm × 165 mm × 58 mm, light receiving area: 346 mm × 165 mm) was used instead of the concrete-made water tank. Nonwoven fabric pleated structure carrying a photocatalyst of 149 mm × 149 mm × thickness 10 mm (supported so that the supported amount of photocatalyst particles (titanium oxide particles) is a surface density of 18 g / m2 on a nonwoven fabric of surface density of 50 g / m2 made of polyolefin fibers. After the treatment, two structures (fabricated so that the pleat interval between the pleats is 5 mm and the pleat height is 10 mm) are put in the plastic pad, and the depth of the water to be treated is 14 mm. I experimented with sunlight on a fine day of November 21st. In the example, in order to make a water flow of 40 mL / min, it was circulated in the tank using a rotary pump (Cal Palmer PA-25A).

  As Comparative Example 1, B-6 manufactured by Toshiba Ceramics Co., Ltd. carrying a photocatalyst (photocatalyst carrying ceramic foam (material is alumina, dimensions are 150 mm × 150 mm × thickness 10 mm, porous body and the number of cells is 6 in 25 mm, The weight was 90 g to 110 g), and 0.8 L of an aqueous solution of blue methylene blue having a concentration of 50 mg / L was treated under the same conditions.

  The experiment started at 12:00 noon and the concentration of methylene blue was measured after sunset. The results are shown in Table 1. The concentration of methylene blue was determined by measuring the absorbance at a wavelength of 665 nm.

  Compared to the case of the ceramic foam according to Comparative Example 1 supporting the photocatalyst, when the nonwoven pleated structure supporting the photocatalyst according to Example 1 of the present invention is used, the decomposition rate of methylene blue is obviously faster. Recognize.

Example 2 and Comparative Example 2
The decolorization test of the sewage wastewater in the pig farm was conducted. As the water to be treated, 0.8 L of sewage colored yellowish brown after aeration treatment of water containing feces and urine from a pig farm was used. Two non-woven pleated structures carrying the photocatalyst of 149 mm × 149 mm × thickness 10 mm (same as the pleated structure used in Example 1) were placed in a plastic pad (internal volume 346 mm × 165 mm × 58 mm, light receiving area 346 mm × 165 mm). The experiment was conducted with sunlight on a fine day of November 23 to 25, 2004, at a depth of water to be treated of 14 mm. Using a rotary pump (Cal Palmer PA-25A), the water flow was circulated in the tank at 40 mL / min.

  As Comparative Example 2, Toshiba Ceramics Co., Ltd. B-6 carrying a photocatalyst having a thickness of 10 mm: Photocatalyst carrying ceramic foam (material is alumina, dimensions are 150 mm × 150 mm × thickness 10 mm, porous body is 25 mm in number of cells) Two pieces (6 pieces, weights from 90 g to 110 g) were used, and 0.8 L of sewage containing sewage from a pig farm was colored yellow-brown after aeration.

  The experiment started at 12:00 noon. The chromaticity was measured by the platinum / cobalt method. Yellow-brown platinum / cobalt color standard solution (1000 degrees: Take 2.49 g of potassium hexachloroplatinum (IV) and 2.00 g of cobalt (II) chloride hexahydrate, add 200 mL of concentrated hydrochloric acid, and add water to make a total amount. The solution of each chromaticity was made, and the sample and the solution of each chromaticity were measured at an absorbance of 390 nm and compared. However, since the suspended matter was mixed in the sewage in the pig farm, the absorbance of the water to be treated was measured after centrifuging at 12,000 rpm for 4 minutes and separating the suspended matter. Table 2 shows the results of the treatment for two days and half a day.

  It was confirmed that the use of the non-woven pleated structure carrying the photocatalyst of the present invention was also more effective for the decolorization of sewage from pig manure in the pig farm than the use of the ceramic foam carrying the photocatalyst.

Example 3, Reference Example 3
As colored water to be treated, 1.4 L of an aqueous solution of blue methylene blue having a concentration of 20 mg / L was used. 149 mm × 149 mm × 23 mm thick non-woven fabric 1 carrying two non-woven pleated structures (similar to the non-woven pleated structure used in Example 1 except that the height of the pleats was 23 mm) , Put in a plastic pad (internal volume 346mm x 165mm x 58mm, light receiving area 346mm x 165mm), depth of water to be treated 30mm, motor 8 with disk 9 (Oriental motor) at 60rpm / min with connecting rod 7 in floating state The motor unit US590-501C and the gear head 5GU3.6KB) were rotated with a speed control motor manufactured by Co., Ltd. and reciprocated by 2 cm. The experiment was conducted with sunlight on a clear day of November 28, 2004. Using a rotary pump (Cal Palmer PA-25A), the water flow was 40 mL / min, and the water was circulated in the tank. As Reference Example 3, two nonwoven pleated structures carrying a photocatalyst were treated under the same conditions without reciprocating. The results are shown in Table 3.

  The experiment started at 12:00 noon. The concentration of methylene blue was measured. The results are shown in Table 3. The concentration of methylene blue was determined by measuring the absorbance at a wavelength of 665 nm.

  It can be seen that when a non-woven pleated structure carrying a photocatalyst is used and reciprocated, the decomposition speed of methylene blue is clearly high.

Example 4, Reference Example 4
The decolorization test of the sewage wastewater in the pig farm was conducted. As water to be treated, sewage colored yellowish brown after aeration treatment of water containing feces and urine from a pig farm was used. However, it was diluted twice with water and 1.4 L was used. Two non-woven pleated structures carrying a photocatalyst of 149 mm × 149 mm × thickness 23 mm are placed in a plastic pad (internal volume 346 mm × 165 mm × 58 mm, light receiving area 346 mm × 165 mm), floating at a depth of 30 mm of water to be treated. In the state, the motor 8 with a disk 9 (rotary motor unit US590-501C and gear head 5GU3.6KB by a speed control motor manufactured by Oriental Motor Co., Ltd.) is rotated by a connecting rod 7 at 60 rpm, and the nonwoven fabric pleated structure is reciprocated 2 cm. I exercised. Experiments were conducted with sunlight on a sunny day from November 30 to December 2. Using a rotary pump (Cal Palmer PA-25A), the water flow was circulated in the tank at 40 mL / min. As Reference Example 4, two nonwoven pleated structures carrying a photocatalyst were treated under the same conditions without reciprocating motion. Table 4 shows the treatment results for two days and half a day.

  It can be seen that when a non-woven pleated structure carrying a photocatalyst is used and further reciprocated, the rate of decolorization of human waste increases.

Example 5
The decolorization test of the sewage wastewater in the pig farm was conducted. As water to be treated, sewage colored yellowish brown after aeration treatment of water containing feces and urine from a pig farm was used. However, it was diluted twice with water and 6.0 L was used. A non-woven fabric 1 carrying a photocatalyst of 149 mm × 149 mm × thickness 35 mm has holes for water passage (similar to the non-woven pleated structure used in Example 1 except that the height of the pleats is 35 mm). Four non-woven fabric pleated structures were floated in four stages of water tanks (each tank has a capacity of 160 mm × 160 mm × 40 mm) shown in FIG. 8, and water was circulated at 4.0 L / min by a pump. The water to be treated at each stage passes through the nonwoven fabric carrying the photocatalyst in order to flow down from the water conveyance portion onto the nonwoven fabric pleated structure. Experiments were conducted with sunlight on a sunny day on December 3, 2005. The results are shown in Table 5.

  It can be seen that when the water to be treated passes through the non-woven pleated structure carrying the photocatalyst, the contact efficiency between the photocatalyst and the pollutant is improved, and the rate of decolorization of human waste is increased.

Example 6
As the water to be treated, 20 L of suspended swamp water having a COD concentration of 3.9 mg / L was used. One non-woven fabric pleated structure of a non-woven fabric 1 carrying a photocatalyst of 149 mm × 149 mm × thickness 35 mm (similar to the non-woven pleated structure used in Example 1 except that the height of the pleats was 35 mm) Water was sprinkled from above the non-woven pleated structure 2 that floated in a water tank (volume 445 mm × 240 mm × 300 mm) and was not pierced with water by a circulation pump 32 at 3.2 L / min (FIG. 9). The experiment was conducted with sunlight on a sunny day on November 26, 2005. The results are shown in Table 6.

  The water treatment method and apparatus using the photocatalyst according to the present invention include wastewater containing manure wastewater from livestock excrement, domestic wastewater, wastewater treatment plant wastewater, wastewater treatment facility wastewater, agricultural wastewater, golf course wastewater, colored wastewater, etc. It is suitable for decomposition and decolorization treatment, and particularly suitable for treatment of sewage wastewater from livestock excrement and contaminated lake water.

It is a longitudinal section of a nonwoven fabric pleat structure carrying a photocatalyst concerning an embodiment of the invention. It is a side view of the nonwoven fabric pleat structure which carry | supported the photocatalyst based on embodiment of this invention. It is a top view of the nonwoven fabric pleat structure which carry | supported the photocatalyst based on embodiment of this invention. It is a longitudinal cross-sectional view of the water treatment facility which concerns on embodiment of this invention. It is a top view of the water treatment facility of FIG. It is a longitudinal cross-sectional view of the water treatment facility which employ | adopted the nonwoven fabric reciprocation mechanism based on embodiment of this invention. It is a top view of the water treatment facility of FIG. It is a longitudinal cross-sectional view of the flowing-down-type water treatment facility using the nonwoven fabric pleat structure which carry | supported the photocatalyst concerning embodiment of this invention. It is a longitudinal section of vertical type water treatment concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nonwoven fabric carrying photocatalyst 2 Nonwoven fabric pleated structure carrying photocatalyst 3 Water to be treated 4 Concrete water tank 4a, 4b, 4c, 4d, 4e Water tank 5 Inlet 6 Outlet 7 Connecting rod 8 Motor 9 Disc 10 Pulley DESCRIPTION OF SYMBOLS 11 Hole for water flow 21 Water treatment facility 22 Partition wall 23a, 23b, 23c, 23d Communication hole 24 Flow-down type water treatment facility 25a, 25b, 25c, 25d, 25e Water tank 26 Water guide part 31 Fixing bowl 32 Circulation pump 33 Water intake 34 Water conduit 35 Water outlet 36 Solar cell 37 Shower

Claims (14)

  A water treatment method using a photocatalyst, wherein a non-woven fabric carrying a photocatalyst is immersed in the water to be treated and irradiated with light to decolorize the organic matter in the water to be treated by decomposition.   The water treatment method using a photocatalyst according to claim 1, wherein the non-woven fabric carrying the photocatalyst is reciprocated in a state of being suspended in the water to be treated.   The water treatment method using a photocatalyst according to claim 1, wherein the non-woven fabric carrying the photocatalyst is vibrated in the water to be treated.   The water treatment method using a photocatalyst according to any one of claims 1 to 3, further comprising stirring means for stirring the water to be treated.   The water treatment method using a photocatalyst according to any one of claims 1 to 4, further comprising water sprinkling means for sprinkling the water to be treated onto a nonwoven fabric carrying the photocatalyst.   The light to be irradiated is at least one light selected from the group consisting of sunlight, fluorescent lamp, black light, germicidal lamp, mercury lamp, halogen lamp and incandescent lamp. A water treatment method using the photocatalyst according to claim 5.   The treated water is at least one selected from the group consisting of wastewater including manure wastewater from livestock excreta, domestic wastewater, wastewater treatment plant wastewater, wastewater treatment facility wastewater, agricultural wastewater, golf course wastewater, and colored wastewater. The water treatment method using the photocatalyst in any one of Claims 1-6 characterized by these.   The non-woven fabric carrying the photocatalyst is made of at least one fiber selected from the group consisting of polyester, polyolefin, and polyamide, the photocatalyst powder is exposed on the fiber surface, and the fiber is processed into a non-woven fabric. It is a body, The water treatment method using the photocatalyst in any one of Claims 1-7 characterized by the above-mentioned.   The water treatment method using a photocatalyst according to any one of claims 1 to 8, wherein the non-woven fabric carrying the photocatalyst is a pleated structure.   The water treatment method using a photocatalyst according to any one of claims 1 to 9, wherein the photocatalyst is made of titanium oxide.   A water treatment apparatus using a photocatalyst, comprising: a water tank into which treated water is introduced and discharged; and a nonwoven fabric carrying a photocatalyst immersed in the treated water in the water tank.   The water treatment apparatus using a photocatalyst according to claim 11, wherein the water tank is divided into a plurality of small water tanks into which the water to be treated flows down.   The water treatment apparatus using a photocatalyst according to claim 11 or 12, further comprising means for reciprocating or vibrating the nonwoven fabric carrying the photocatalyst in the water to be treated.   The water treatment apparatus using a photocatalyst according to any one of claims 11 to 13, wherein the non-woven fabric carrying the photocatalyst comprises a pleated structure.

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