JPH08141560A - Method and apparatus for making whole nitrogen harmless and removing whole phosphorus - Google Patents

Abstract

PURPOSE: To oxidize the whole nitrogen in eutrophic raw water to make the water harmless and to remove the whole phosphorus, colibacillus, and miscellaneous bacteria simply and effectively by irradiating the raw water with ultraviolet rays in the presence of a photosensitizing substance and irradiating again the treated raw water with ultraviolet rays. CONSTITUTION: Raw water from a pond etc., is sent to a raw water inlet 4 by a storage pump 3, is supplied to chambers 6 which are partitioned by a dam 8 of a water tank 1, and reaches a treated raw water outlet 9. A porous filter is placed on the bottom surface of the water tank 1, and ceramic balls containing a photosensitizing substance are mounted on the filter. Organic substances in the raw water are oxidation-decomposed by irradiating the photosensitizing substance with ultraviolet rays to be made harmless and then discharged outside a system. Aerobic microorganisms such as nitration bacteria propagate on the rear sides of the filter and the ceramic balls so that decomposition by the microorganisms takes place. The treated water is introduced into an ultraviolet sterilizing layer 12 to be irradiated with a ultraviolet lamp 15, and after sterilized, is discharged from an outlet 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sludge pond, swamp water,
The present invention relates to a method and an apparatus for detoxifying total nitrogen, detoxifying total nitrogen in water, and sterilizing E. coli, various bacteria, etc. from lake water and rivers.

[0002]

2. Description of the Related Art With the increase in the amount of domestic wastewater in recent years,
In swamp water, lake water, rivers, etc., nitrogen and phosphorus in the water are remarkably increased to become eutrophication, and pollution (deterioration of odor, turbidity, chromaticity) is progressing. In particular, anaerobic compounds in water are the cause of malodor.

However, conventional water purification treatment techniques include those using chemical coagulants, those using activated carbon, those using ultrafiltration membranes such as hollow fibers, those using biological treatment, and combinations of these. Although many treatment systems have been developed, such as sewage treatment, all have merits and demerits, and are not always sufficient for treating sludge-treated ponds, swamp water, lake water, rivers and the like.

Moreover, as described above, nitrogen and phosphorus in water can be easily and effectively supplied from a large-capacity (20,000 to 30,000 m ³ ) pond, marsh water, lake water, river, etc., which has been increased in phosphorus content and has become eutrophication. The technology for detoxification and removal was rather close to nothing.

[0005]

DISCLOSURE OF THE INVENTION The present invention oxidizes and detoxifies nitrogen in water from eutrophic large-capacity ponds, swamps, lakes, rivers, etc. to remove phosphorus easily and effectively. The present invention aims to provide a novel method and apparatus for detoxifying total nitrogen and removing total phosphorus.

[0006]

Means for Solving the Problems The present inventor has been earnestly studying to achieve the above-mentioned problems. As a result, by combining a photosensitizer and ultraviolet irradiation, water from eutrophication Oxidizing and detoxifying all nitrogen, total phosphorus,
A method and an apparatus for easily and effectively removing Escherichia coli, various bacteria and the like can be found, and the present invention has been completed.

That is, the present invention is as follows. (1) Detoxification of total nitrogen and removal of total phosphorus characterized by irradiating raw water with ultraviolet rays in the presence of a photosensitizer, and then irradiating the treated raw water with ultraviolet rays again. Method.

(2) Characteristically, the raw water is irradiated with ultraviolet rays in the presence of a photosensitizer, and then the treated raw water is irradiated with ultraviolet rays again to sterilize, and further water is ejected by an ejector. Detoxification of total nitrogen and total phosphorus removal method.

(3) A device comprising a removal water tank (1) having an ultraviolet lamp (2) and an ultraviolet sterilization tank (12), wherein the removal water tank (1) is treated with an inlet (4) of raw water. It has a raw water outlet (9) and its removal water tank (1)
A porous filter (10) and a photosensitizer (11) are disposed on the bottom surface inside the container, and an ultraviolet lamp (2) is provided on the upper surface of the removal water tank (1). The ultraviolet sterilization tank (12) has a treated water inlet (13) and a treated water outlet (13), and an ultraviolet lamp (15) is arranged in the ultraviolet sterilization tank (12). Detoxifying nitrogen, total phosphorus removal device.

The present invention will be described in detail below. An apparatus for detoxifying total nitrogen and removing total phosphorus according to the present invention will be described with reference to FIGS.

The main part of the apparatus for detoxifying total nitrogen and removing total phosphorus according to the present invention comprises a removal water tank (1) having an ultraviolet lamp (2) and an ultraviolet sterilization tank (12).

First, the removal water tank (1) having the ultraviolet lamp (2) will be described. The removal water tank (1) having this ultraviolet lamp (2) irradiates the raw water with ultraviolet rays in the presence of the photosensitizer to remove ammoniacal nitrogen, nitrite nitrogen, nitrate nitrogen, etc. in the raw water. It oxidizes all nitrogen to make it harmless, adsorbs and removes all phosphorus, and sterilizes it.

1 to 5, 1 is a removal water tank, 2 is an ultraviolet lamp, 3 is a pump for pumping water, 4 is an inlet of raw water, 5 is a pipe header, 6 is a chamber, 7 is a dam, 8 is a dam, 9 is a An outlet of treated raw water, 10 is a porous filter, and 11 is a photosensitizer-containing ceramic ball (photocatalytic titanium oxide-containing ceramic ball).

In the figure, the removal water tank (1) is a water tank having a rectangular shape as viewed from above and having a predetermined depth.
Both ends of the rectangular water tank are provided with an inlet (4) for raw water and an outlet (9) for treated raw water, respectively.

Further, the inside of the rectangular removal water tank (1) is
Each chamber is divided by a dam or a weir from the raw water inlet (4) to the treated raw water outlet (9).
In the vicinity of the raw water inlet (4), a higher dam (7) separates the chamber, and subsequently the chamber is separated by lower dams (8). In these dams (7, 8), a plurality of V-shaped grooves are carved on the tops of the dams so that the raw water moves to the next chamber while overflowing in a certain amount.

Further, a porous filter (10) (thickness: 25 mm) is laid on the inner bottom surface of the removal water tank (1), and a photosensitizing substance-containing ceramic ball (11) (average) is further provided thereon. (Diameter 20 mm) is spread.

An ultraviolet lamp (2) is installed on the upper surface of the removal water tank (1). The ultraviolet rays emitted from the ultraviolet lamp (2) cause the photosensitizer-containing ceramic balls (11) to act as a strong catalyst.

Although the present invention has been described above with reference to FIGS. 1 to 5, the shapes and structures of the removal water tank (1) and the dams (7, 8) of the present invention are limited to those shown in FIGS. It is not something that will be done.

The porous filter is for preventing the ceramic balls containing the photosensitizer from moving together with the flow of the raw water, and so long as it can achieve the same function as this porous filter, The above materials can also be used.

Further, in the figure, the photocatalytic titanium oxide-containing ceramic balls (11) are used, but not only those in which the photocatalytic titanium oxide is carried or impregnated in the ceramic balls, but also those which are carried or impregnated in pumice having a large surface area are used. It may be a thing. Generally, a material having a large surface area is preferable and is not particularly limited. Also, regarding the particle size,
There is no particular limitation.

Examples of photosensitizers include titanium oxide (TiO ₂ ) which is a photoelectrochemical catalyst (photocatalyst), and Ga.
As, CdS, CdSe, ZnO, SnO ₂ , WO ₃ ,
Examples thereof include SrTiO ₂ . As the carrier to be supported or impregnated, various materials such as glass beads, aluminum plates, etc. may be used in addition to the above-mentioned ceramic balls and pumice stones.

The distance between the ultraviolet lamp (2) and the photosensitizing substance-containing ceramic ball (11) depends on the type of raw water,
The amount should be set so that the most effective processing can be performed. In addition, the number of ultraviolet lamps used in the embodiment is five for one water tank.
The optimum number should be selected in relation to the treatment efficiency of total nitrogen and total phosphorus.

As an ultraviolet lamp, 100 nm to 40 nm
Those having a wavelength of 0 nm are used. 315 nm to 3
80 nm (UV-A), 280 to 315 nm (UV-
Any of B) and an ultraviolet lamp having a wavelength of 100 to 280 nm (UV-C,) can be used. A near-ultraviolet lamp mainly having a wavelength of 315 nm to 380 nm is preferable as the ultraviolet lamp used on the upper surface of the removal water tank (1).

Generally, the wavelength of ultraviolet rays to be used is selected from far, medium and near ultraviolet rays depending on the type of treated water and the type of bacteria in the treated water. When the treated water is domestic wastewater, deep ultraviolet rays are suitable.

Next, the ultraviolet sterilization tank (12) will be described. In the UV sterilization tank (12), all nitrogen is detoxified,
This is for sterilizing Escherichia coli, various bacteria, etc. by further irradiating the treated water from which all phosphorus is removed with ultraviolet rays.

1 to 5, reference numeral 12 is an ultraviolet sterilization tank, 13 is a treated water inlet, 14 is a treated water outlet, and 15 is an ultraviolet sterilization lamp.

The ultraviolet sterilization tank (12) of the present invention has a cylindrical shape, and the treated water inlet (1
3), a treated water outlet (14) is provided. And
In a preferred embodiment of the present invention, a UV sterilization tank (12)
A cylindrical quartz glass tube is provided in the vicinity of the central portion (central portion) of the, and the axial center portion of the quartz glass tube does not come into contact with the quartz glass tube, and the ultraviolet germicidal lamp (15) Are arranged.

As described above, when the ultraviolet sterilization lamps (15) are concentrically arranged in the quartz glass tube in the ultraviolet sterilization tank (12) to have a double structure, the device can be made compact. Is important in.

Further, in the present invention, the ultraviolet sterilization tank (1
It is preferable that an ejector (not shown) is provided and water is discharged by the ejector.

Further, in the present invention, if necessary, equipment such as a flocculation reaction tank, various filtration tanks such as a rotary drum type, a membrane fixing type, various treated water tanks, and an adjusting tank can be used together.

The detoxifying method for total nitrogen and the method for removing total phosphorus according to the present invention will be described below in the order of the flow of raw water with reference to FIGS.

Raw water from ponds, swamps, lakes and rivers
It is sent to the raw water inlet (4) by the pumping pump (3) and supplied to the chamber (6) of the water tank (1).

The raw water supplied into the chamber (6) overflows the dam (7) by a certain amount and then sequentially overflows each chamber partitioned by the dam (8) in the main body of the water tank (1). While passing, it reaches the treated raw water outlet (9).

At this time, since the porous filter is laid on the bottom surface of the water tank (1) and the photosensitizing substance-containing ceramic balls are evenly spread on the porous filter, the photosensitizing substance from the upper surface is not covered. Upon irradiation with ultraviolet rays, organic substances in the raw water are oxidatively decomposed, rendered harmless, and released outside the system. Total nitrogen such as ammoniacal nitrogen, nitrite nitrogen, and nitrate nitrogen in raw water is oxidized and rendered harmless, and total phosphorus is adsorbed and captured by the photosensitizer-containing ceramic balls.

At the same time, since the back surface of the porous filter and the photosensitizing substance-containing ceramic ball laid on the bottom surface of the device is not exposed to ultraviolet rays, aerobic microorganisms such as nitrifying bacteria propagate after a certain period of time, and Is disassembled.

Then, the treated raw water thus retained and treated in the removal water tank (1) for a certain period of time enters the treated water inlet (13) of the ultraviolet sterilization tank (12) and enters the sterilization tank (12).
After being irradiated with the ultraviolet sterilization lamp (15) arranged inside the container, it is sent to the treated water outlet (14).

In this process, various bacteria such as Escherichia coli in the treated raw water are sterilized by irradiation with the ultraviolet sterilization lamp (15).

The strength of the ultraviolet sterilization lamp can be adjusted, and in addition to the lamp, other kinds of sterilization lamps can be used as required.

The sterilized treated water is preferably further discharged by an ejector. That is, several times (capacity) of the processing capacity of the above equipment is injected into the treated water, the water supply pressure is increased, the water of the source of raw water such as ponds is rotated, and the aerobicity of the total amount of water such as ponds is promoted. Can be made.

[0040]

【The invention's effect】

(1) All nitrogen such as ammoniacal nitrogen, nitrite nitrogen, and nitrate nitrogen in raw water is oxidized to be harmless, and 90% or more of total phosphorus is removed. Ultraviolet light (UV-
A, 320 to 400 nm, UV-B, 290 to 320 n
m, UV-C, 180-290 nm,)
Demonstrate a strong action. Therefore, the organic matter is oxidatively decomposed, rendered harmless, and released outside the system. It also exerts bactericidal activity against various bacteria including E. coli.

(2) Since ultraviolet rays do not reach the back surface of the porous filter and the photosensitizing substance-containing ceramic ball (or carrier) laid on the bottom surface of the device, nitrifying bacteria and the like propagate and synergize after a certain period of time. Be effective.

(3) The photosensitizing substance-containing ceramic ball (or carrier) has an excellent ability to adsorb phosphorus compounds and adsorbs and traps phosphorus compounds in water. However, since the photosensitizer-containing ceramic balls have a limited adsorption capacity, after adsorbing a certain amount of phosphorus compounds, they are taken out and desorbed with an acid for regeneration. Regeneration can be easily desorbed with acid. At this time, the adsorption capacity is revived,
It can be reused.

[0043]

EXAMPLES The present invention will be further described below with reference to examples, but the present invention is not limited to these examples.

[0044]

Example 1 A pond (8000 m ³ ) was treated, and
-It carried out using the total nitrogen detoxification and total phosphorus removal apparatus shown in FIG. The raw water in this pond has an odor and its pH is 5.5.
The transparency was 10 cm or less.

The removal water tank of this device has five water tanks (pieces).
It consists of 5 tanks, and the size of 1 tank is 1000m wide.
m, depth 1300 mm, and height 50 mm. And
A porous filter (10) (thickness: 25 mm, a product of Ishihara Sangyo Co., Ltd.) is laid on the bottom of each water tank (1), and a photocatalytic titanium oxide (true specific gravity) is provided on a ceramic carrier on the porous filter (10). Photocatalytic titanium oxide-containing ceramic balls (11) containing 4.2) (average diameter 20 m
m, Ishihara Sangyo Co., Ltd. products are evenly spread. A near-ultraviolet lamp (2) (UV-A, 315 nm to 380 nm, manufactured by Iwasaki Electric Co., Ltd.) is installed at a distance of 70 mm or less from the photocatalytic titanium oxide-containing ceramic ball (11).

The ultraviolet sterilization tank (12) has a length of 90.
It is a 0 mm cylindrical tank. Far ultraviolet sterilization lamp (15) (UV-C, 100 nm-
280 nm, Iwasaki Electric Co., Ltd. product is located.

The raw ^{water, 15m 3 / h (= 7200m} 3/20 days at a rate per tank 50L / min (5-stage tank)
(Corresponding to the treatment capacity of), and supplied to the removal water tank (1),
Irradiated with a near UV lamp (2).

Then, the near-ultraviolet lamp was irradiated and the treated raw water treated was supplied to the ultraviolet sterilization tank (12) and further irradiated with the far-ultraviolet sterilization lamp (15) to sterilize various bacteria and coliforms.

Further, the treated raw water sterilized in this way was injected with an ejector installed in the middle of pumping to inject 5 times (volume) of air with respect to the water supply amount of 15 m ³ / h to raise the water supply pressure. , The water in the pond (8000 m ³ ) was rotated. In this way, by further installing an ejector (not shown), aerobicity can be promoted, the pooled water in the pond can be eliminated, and the aerobicity of the total amount of water in the pond can be further promoted, resulting in a short-term effect. I was able to raise it.

With the apparatus of the present invention, 8000 m ³ of water was rotated about once for 20 days, and the removal efficiency was visibly good. Further, aerobic microorganisms propagated on the porous filter (10), BOD, COD, and total nitrogen were oxidized and rendered harmless, and the total phosphorus removal rate was 90% or more, which was considerably large. Particularly, the pH of the raw water of 8000 m ³ (pH before operation: 5.5 or less) returned to neutral (pH 7.2) after the raw water was rotated about once, and the anaerobic property became aerobic. The odor of water is completely gone. Turbidity and chromaticity have improved. The transparency is 10 before driving.
Raw water that was less than or equal to cm rose to 22 cm.

When the apparatus of the present invention is operated all year round, 200
Pond 00m ³ ~30000m ^3, Numasui, lake, that can keep the aerobic river revealed.

[Brief description of drawings]

FIG. 1 is a front view showing an entire apparatus for detoxifying total nitrogen and removing total phosphorus according to the present invention.

FIG. 2 is a plan view of the apparatus for detoxifying total nitrogen and removing total phosphorus according to the present invention, as seen from above.

FIG. 3 is a front view in which a part of a removal water tank that constitutes the total nitrogen detoxification and total phosphorus removal device of the present invention is cut away.

FIG. 4 is an explanatory view showing a relationship between a dam and a removal water tank that constitutes the total nitrogen detoxification and total phosphorus removal device of the present invention.

FIG. 5 is a front view in which a part of an ultraviolet sterilization tank constituting the apparatus for detoxifying total nitrogen and removing total phosphorus according to the present invention is cut away.

[Explanation of symbols]

 1 Removal Water Tank 2 Ultraviolet Lamp 3 Pumping Pump 4 Raw Water Inlet 5 Pipe Header 6 Chamber 7 Dam 8 Dam 9 Outlet of Treated Raw Water 10 Porous Filter 11 Ceramic Ball Containing Photosensitizer 12 Ultraviolet Sterilization Tank 13 Treated Water Inlet 14 Treated Water Exit 15 UV sterilization lamp

Claims (3)

[Claims] 1. Detoxification of total nitrogen, characterized by irradiating raw water with ultraviolet rays in the presence of a photosensitizer, and then irradiating the treated raw water again with ultraviolet rays to sterilize the total nitrogen. Phosphorus removal method. 2. A method of irradiating raw water with ultraviolet rays in the presence of a photosensitizer, irradiating the treated raw water again with ultraviolet rays to sterilize the raw water, and further discharging the water with an ejector. A method of detoxifying all nitrogen and removing all phosphorus. 3. An apparatus comprising a removal water tank (1) having an ultraviolet lamp (2) and an ultraviolet sterilization tank (12), wherein the removal water tank (1) comprises a raw water inlet (4) and treated raw water. Of the removal water tank (1), and the porous filter (10) and the photosensitizer (11) are arranged on the bottom surface inside the removal water tank (1), and on the top surface of the removal water tank (1). Is provided with an ultraviolet lamp (2), and the ultraviolet sterilization tank (12) has a treated water inlet (13) and a treated water outlet (13), and the ultraviolet sterilization tank (1)
An apparatus for detoxifying total nitrogen and removing total phosphorus, characterized in that an ultraviolet lamp (15) is arranged in 2).