JPH05301004A - Liquid purifying device - Google Patents

Abstract

PURPOSE:To effectively remove organic dissolved matter in liquid for a long time in a contact part of liquid to be treated and an adsorbing part by passing the liquid from one surface to the other of the adsorbing part. CONSTITUTION:In a contact part 11, an adsorbing part 1 formed in the shape of a belt by using an adsorbent moves along the peripheral part of a rotary drum 2 in an original liquid 7 stored. At this time, since each small chamber inside the rotary drum 2 communicates with an discharge line 17 and evacuated by a discharge pump 18, the original liquid 7 is passed through the adsorbing part 1 to move to the small chambers in the rotary drum 2. The original liquid 7 which has moved to the small chambers is further passed through a rotary valve 16 and the discharge line 17, and discharged from a treated liquid outlet 9 by the discharge pump 18. Thus, since, in the contact part 11, the flow of the original liquid passing from one surface to the other one of the adsorbing part 1 is formed, organic dissolved matter in the original liquid is effectively brought into contact with an adsorbent in the adsorbing part 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid purification apparatus for removing various dissolved substances existing in various liquids, particularly organic dissolved substances, and particularly to the organic dissolved water of various drainage water and rivers, lakes and marshes. The present invention relates to a liquid purification device that continuously and stably removes substances.

[0002]

2. Description of the Related Art In recent years, rivers, lakes and marshes and groundwater have been polluted as seen in the pollution of rivers due to the increase of domestic drainage due to the progress of urbanization and the outflow of residual pesticides due to the large amount of various pesticides sprayed at golf courses. Water pollution due to such organic substances has become a major social problem.

As a purification method for removing these organic dissolved substances from the liquid, a biochemical decomposition and removal method using the oxidative decomposition action of microorganisms, various oxidizing agents such as chlorine and ozone, and ultraviolet rays are used. A method of physically and chemically decomposing and removing by a photochemical reaction, a method of adsorbing and removing a dissolved substance with an adsorbent such as activated carbon or ceramics, and the like are used.

Among these methods, ozone is an oxidant having an extremely high oxidative ability, and the oxidative decomposition method using ozone is that the oxidant remains in the liquid after treatment such as that found in chlorine. In recent years, it has been gradually used as an effective method that does not suffer from problems such as the above and the generation of chlorine compounds. In addition, decomposition by a photochemical reaction by ultraviolet rays is a method without problems such as remaining in the liquid after treatment, and adsorption removal by an adsorbent is also a safe and effective purification method.

[0005]

In the liquid purifying apparatus using ozone up to now, oxidative decomposition is carried out by directly injecting air containing ozone or the like into the target liquid to oxidize and decompose it. Since it has a low solubility, it is basically inefficient. In order to more effectively decompose and remove the organic dissolved substance in the liquid, it is necessary to increase the ozone concentration in the liquid or to lengthen the contact time between the liquid and ozone.
Most of the supplied ozone is exhausted without being absorbed by the liquid, so it is necessary to supply an excessively high concentration of ozone in order to raise the ozone concentration in the liquid, but high concentration ozone is highly toxic and exhausted. It is necessary to remove it from the inside. As described above, the present situation is that the ozone concentration in the liquid cannot be increased so much in terms of solubility and removal of ozone in the exhaust gas.

The purifying apparatus using ultraviolet irradiation also has a structure in which an ultraviolet lamp is installed in an ultraviolet permeable waterproof case such as quartz glass, and is put in a liquid for direct irradiation. In the liquid, the irradiation intensity of the ultraviolet rays is rapidly attenuated, so that the effect is sufficiently exerted only on the liquid in the vicinity of the ultraviolet lamp and the reaction takes a long time. In order to compensate for this, the treatment is also carried out by using an oxidizing agent such as ozone or chlorine, but since the treatment is carried out in a liquid, it is inevitable to reduce the effect by the liquid.
Further, if the liquid is colored, there is a problem that the effect is further lowered, and that dirt in the liquid adheres to the surface of the waterproof case to lower the irradiation intensity.

[0007] Although the purification method using an adsorbent such as activated carbon is safe and effective, it requires an adsorbent amount corresponding to the treatment liquid amount, and an apparatus using this requires a large mixing tank or packed tower. is there. Further, as the amount of the adsorbed substance increases, the adsorbing ability decreases, so that there is a problem that the adsorbent needs to be discarded or replaced and the treatment cannot be continuously performed. It is possible to reuse the adsorbent whose adsorption capacity has been lowered by regenerating it, but there is a problem in that equipment and the like for it are required separately and the cost is high.

[0008]

The present inventors have used a purifying device for removing organic dissolved substances in a liquid by utilizing a decomposition reaction by an oxidant or ultraviolet irradiation, and an adsorption removing method by an adsorbent such as activated carbon. As a result of repeated studies on a liquid purification device that improves the drawbacks of the purification device that can be removed by more efficient, safe and stable removal over a long period of time, adsorption removal by an adsorbent and ultraviolet rays, It has been found that the organic dissolved substance in the liquid can be removed extremely effectively by using an apparatus having a configuration in which decomposition reactions such as ozone are combined, and the present invention has been completed.

That is, in the liquid purifying apparatus of the present invention, the adsorption part formed in the shape of a belt using an adsorbent is immersed in the adsorption part to adsorb the dissolved substance in the liquid onto the adsorbent. And a decomposition reaction part for decomposing the dissolved substance adsorbed by the adsorbent provided outside the contact part,
In the contact portion, a flow of the liquid such that the liquid passes from one surface of the adsorption portion to the other surface is formed, This is to enable effective purification of liquid.

[0010]

The operation of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of the liquid purification apparatus of the present invention in which ultraviolet rays are applied to the decomposition reaction section. A belt-shaped suction unit 1 made of an adsorbent is installed on a rotary drum 2, a driving roll 3, etc. as shown in the figure, and these are placed inside a container 6 composed of a storage tank 4 and a lid 5. It is housed. The stock solution 7 is introduced from the stock solution introduction line 8 and is primarily stored in the storage tank 4, and then the process solution 10 is discharged from the process solution outlet 9.
As outflow. The stored portion of the undiluted solution 7 functions as the contact portion 11 with the liquid. An ultraviolet irradiation unit 13 incorporating an ultraviolet lamp 12 is installed above the contact unit 11, and a decomposition reaction unit 14 is configured.

The inside of the rotary drum 2 is divided into a plurality of small chambers by a partition wall 15 extending radially from the central portion to the outer peripheral portion. The outer peripheral portion of these small chambers, that is, the outer peripheral portion of the rotary drum is a drum. A communication portion to the outside is formed. These small chambers are moved by the rotary valve 16 installed in the central portion of the rotary drum 2 while the belt-shaped adsorption unit 1 and the outer peripheral portion of the rotary drum 2 are in contact with each other while moving in the stock solution of the storage tank 4. Each communicates with the discharge line 17. A discharge pump 18 is installed in the discharge line 17.

Purification of the stock solution is carried out as follows. That is, the adsorption unit 1 is moved by the rotation of the driving roll 3 and the rotary drum 2 in the direction of the arrow in the figure to be introduced into the liquid contact unit 11 and adsorbs the organic dissolved substance in the undiluted liquid 7 while passing therethrough. To do. The adsorption part 1 coming out of the contact part 11 is then introduced into the decomposition reaction part 14 and installed in the ultraviolet lamp 12.
As a result, it is irradiated with ultraviolet rays to decompose and remove the adsorbed organic dissolved substance. The adsorbing part 1 from which the adsorbed organic dissolved substance has been removed is again introduced into the contact part 11, and this operation is repeated thereafter.

In the contact portion 11, the adsorption portion 1 moves in the stock solution 7 just stored along the outer peripheral portion of the rotary drum 2. At this time, as described above, the small chambers inside the rotary drum are discharged lines. Since the inside is decompressed by the discharge pump installed in the discharge line in communication with 17, the stock solution 7 passes through the adsorption section 1 and moves to the small chamber in the rotary drum 2. The undiluted solution 7 moved to the small room is further rotated by a rotary valve 16,
It passes through the discharge line 17 and is discharged from the processing liquid outlet 9 by the discharge pump 19.

As described above, the belt-shaped suction portion 1 is connected to the contact portion 1.
1 and the decomposition reaction section 14 are continuously and repeatedly moved, and at the contact section 11, a flow of the undiluted solution passing from one surface of the adsorption section 1 toward the other surface is formed. The organic dissolved substances in the stock solution are effectively contacted and adsorbed by the adsorbent, and the organic dissolved substances in the stock solution can be continuously stabilized and efficiently removed over a long period of time. It becomes.

FIG. 2 is a perspective view showing another example of the liquid purifying apparatus of the present invention in which the decomposition reaction section is similarly irradiated with ultraviolet rays. The belt-shaped suction unit 1 is alternately passed between the drive rolls 3 and the like installed in a container 6 composed of a storage tank 4 and a lid 5 as shown in the figure. is set up. The stock solution 7 is introduced into the container 6 in a form of being jetted from the stock solution introduction line 8 to the adsorption section 1 just below the discharge nozzle 20.
The introduced undiluted solution 7 drops while coming into contact with the adsorbing sections 1 of several stages passed to the left and right in order, is primarily stored in the lower part of the storage tank 4, and then flows out as a processing solution 10 from a processing solution outlet 9. The portion below the discharge nozzle 20 is the contact portion 11 with the liquid of the adsorption portion 1
Function as. An ultraviolet irradiation unit 13 incorporating an ultraviolet lamp 12 is installed above the contact unit 11, and a decomposition reaction unit 14 is configured.

The adsorption part 1 is continuously moved in the direction of the arrow in the figure by the drive roll 3, and is brought into contact with the stock solution 7 directly below the discharge nozzle 20 to adsorb the organic dissolved substance contained in the stock solution. .. At this time, the undiluted solution discharged onto the upper surface of the adsorption unit 1 by gravity passes through the adsorption unit 1 and flows down to the lower adsorption unit. In this way, not only the undiluted solution comes into contact with the surface of the adsorption section, but also a flow of the undiluted solution that passes from one surface of the adsorption section to the other surface is formed. The organic dissolved substances are effectively contacted and adsorbed. Further, the adsorbing section 1 moves to the lower stage thereafter, and again contacts the stock solution that has passed through the upper adsorbing section 1, and this is repeated to effectively adsorb and remove. The adsorbing part 1 that has reached the lower part of the contact part is then introduced into the upper decomposition reaction part 14 and is irradiated with ultraviolet rays to decompose and remove the adsorbed organic dissolved substance. The adsorbing part 1 from which the adsorbed organic dissolved substance is removed is again introduced into the contact part 11, and thereafter, the organic dissolved substance in the stock solution is repeatedly removed in the same manner.

In the above-mentioned two examples, ultraviolet irradiation was used for decomposing and removing the organic dissolved substances adsorbed in the adsorbing section. However, instead of the ultraviolet irradiating section 13, an ozone supplying section is installed so that the air having an increased ozone concentration is supplied. By supplying the same, the same effect can be obtained.

As described above, in the conventional liquid purifying apparatus, since the oxidizing agent such as ozone is directly injected into the liquid or the ultraviolet ray is irradiated, the solubility of the oxidizing agent in the liquid and the decomposition due to the influence of the liquid itself are decomposed. The reduction of the effect was an unavoidable problem. In the purifying apparatus of the present invention, instead of directly irradiating the liquid with ultraviolet rays or injecting ozone, once the organic dissolved substance to be removed in the liquid is adsorbed to the adsorbent at the contact portion, and taken out of the contact portion. Ozone is directly acted on in the air, or ultraviolet rays are irradiated to cause a decomposition reaction. Therefore, the problem of reduction in the efficiency of the decomposition reaction found in liquid is solved. Also, while adsorbing the organic dissolved substance in the liquid to the adsorbent, the adsorbed organic dissolved substance is decomposed and removed, and since this operation is continuously repeated, the adsorption capacity of the adsorbent is maintained, and for a long period of time. It is possible to carry out continuous and stable removal.

In order to carry out the decomposition reaction in the decomposition reaction section more effectively, it is desirable that the surface of the adsorbent in the adsorption section is directly exposed to ultraviolet rays or ozone. Therefore, after passing through the contact portion 11, the belt-shaped suction portion 1 is passed and attached to a liquid removing mechanism such as a roll-shaped squeezing mechanism or a mechanism that blows air to blow away the attached liquid. It is preferable to remove as much liquid as possible.

As the adsorbent, those having various principles and functions can be used depending on the purpose of purification. For example, various natural minerals, ceramics, activated carbon and the like can be used, but activated carbon is particularly preferable in terms of adsorption capacity and cost. As the shape of these adsorbents, various shapes such as granular shape and fibrous shape can be used, but in particular, fibrous shape having a large surface area of the adsorbent per unit weight is preferable. By using an adsorbent having a property of selectively adsorbing a specific substance in the liquid, it becomes possible to continuously remove the specific substance from the liquid.

A belt-shaped adsorption section using an adsorbent can easily adsorb an organic dissolved substance in a liquid and pass the liquid to effectively carry it out, and can be oxidized by ozone in the air. It is desirable to be porous in order to efficiently carry out the decomposition reaction. Further, in order to effectively carry out the decomposition reaction by ultraviolet irradiation, it is preferable that the adsorption part has a shape such that the substantial surface area (ultraviolet irradiation area) can be obtained.

The belt-shaped adsorption portion is formed by sandwiching, for example, a fibrous activated carbon processed into a sheet shape or a granular activated carbon entangled in a nonwoven fabric and processed into a sheet shape with mesh belts. Alternatively, the mesh can be formed into a flat bag-shaped or box-shaped container, and a large number of particles filled with granular activated carbon can be connected and configured. In addition, a fibrous adsorbent may be spun, and may be bundled or woven into a cloth to have various structures. In any case, it is sufficient that the belt shape is strong enough to maintain the driving force of the driving roll or the like.

Further, as a driving mechanism for the belt-shaped suction section,
A roll-shaped support is preferably used, but a chain-shaped support mechanism may be provided at both ends of the belt-shaped suction part and driven by chain gears, or other various drive methods may be used. You can In any of the driving methods, it is sufficient that the suction portion can be moved stably.

When ozone is used for decomposition, for example, as shown in FIG.
In the apparatus shown in (1), it is also preferable to inject ozone into the liquid of the contact portion 11 in addition to supplying ozone to the decomposition reaction portion 14 in order to further enhance the oxidative decomposition effect. In this case, air having an increased ozone concentration may be directly injected into the liquid, or the decomposition reaction unit 14
It can be carried out by providing a mechanism for circulating the air of the decomposition reaction portion between the contact portion 11 and the contact portion 11 so as to circulate the air.

Similarly, in the case of using ozone in the example of FIG. 2, in addition to introducing air having an increased ozone concentration into the decomposition reaction section 14, mixing this air into a part of the stock solution introducing line 8 is also recommended. It is also preferable to carry out together. By doing so, it becomes possible to further enhance the oxidative decomposition effect.

Further, it is desirable that the decomposition reaction is carried out by simultaneously acting the ultraviolet irradiation and the ozone treatment, because the respective decomposition capacities exert a synergistic effect and a higher effect can be obtained.

An ultraviolet lamp which emits various wavelengths of ultraviolet rays can be used for the irradiation of ultraviolet rays, and particularly, ultraviolet rays having a wavelength of 253.7 nm, which is highly effective in decomposing organic substances, and a wavelength which changes oxygen in the air into ozone. Those that efficiently irradiate with ultraviolet rays having a wavelength of 184.9 nm can be suitably used. There is a low-pressure mercury lamp as an ultraviolet lamp that efficiently irradiates ultraviolet rays of the above two wavelengths at the same time, but when this is used, ozone is generated at the same time as the irradiation of ultraviolet rays. There is an advantage that a synergistic effect of ultraviolet irradiation and decomposition by ozone can be obtained without installing.

[0028]

【Example】

Example 1 Fibrous activated carbon processed into a felt shape (Osaka Gas Co., A
-15) was sandwiched between stainless steel meshes to form a belt having a width of 30 cm and a length of 1 m, and this was used as an adsorption part to produce a liquid purification device having the configuration shown in FIG. For the ultraviolet lamp, a metal halide lamp (MB-75 manufactured by Nihon Battery Co., Ltd.)
N) was used.

As the stock solution, tap water containing sucrose as a main component and various organic substances such as organic pesticides and detergents was used (CO
D20 ppm). This stock solution was supplied to the device at 100 ml / min for purification treatment, and the COD of the treated liquid flowing out from the device was measured. The COD was measured by the consumption amount of potassium permanganate at 100 ° C. The COD of the treatment liquid at the start of treatment is about 3.5 ppm (removal rate about 82
%), And about 5.5 liters at the time of cumulative processing amount of 3000 liters.
It was ppm (removal rate about 72%). After that, the treatment was continued up to 5000 liters, but almost the same purification effect was maintained.

Example 2 A purification apparatus was produced in which the ultraviolet lamp was removed from the liquid purification apparatus used in Example 1 and instead the ozone supply section was installed in the decomposition reaction section. Using the same stock solution as in Example 1, air having an ozone concentration of 15 mg / liter was supplied to the apparatus for purification treatment (supplied amount: 3 liters per minute). The supply amount of the stock solution was 100 ml / min as in Example 1. The COD of the treatment liquid at the start of treatment is about 3 ppm (removal rate about 85
%), And about 4.5 liters at the time of cumulative processing volume of 3000 liters.
It was ppm (removal rate about 77%). After that, the treatment was continued up to 5000 liters, but almost the same purification effect was maintained.

Example 3 An apparatus was prepared in which an air nozzle was installed in the liquid purification apparatus used in Example 2 and air was blown to the adsorption section 1 after passing through the contact section 11 to remove the adhering stock solution. Then, the purification treatment was performed under the same conditions as in Example 2. The COD of the treatment liquid at the start of treatment is about 2.5 ppm (removal rate about 87%), and about 4 when the cumulative treatment amount is 3000 liters.
It was ppm (removal rate about 80%). After that, the treatment was continued up to 5000 liters, but almost the same purification effect was maintained.

Example 4 An apparatus was further prepared in which an ozone supply section was installed in the decomposition reaction section of the apparatus used in Example 1, and the treatment was carried out by simultaneously using ultraviolet irradiation and ozone. The same stock solution as in Example 1 was supplied at 100 ml / min for treatment. Ozone was supplied under the same conditions as in Example 2. The COD of the treatment liquid at the start of the treatment was about 2.5 ppm (removal rate about 87%), and when the cumulative treatment amount was 3000 liters, it was about 3.5 ppm (removal rate about 82%), which was a high purification effect. After that, the treatment was continued up to 5000 liters, but almost the same purification effect was maintained.

Comparative Example 1 The discharge line 17 of the apparatus used in Example 1 was closed so as to prevent the flow of the stock solution from passing through the adsorbing section 1 in the rotary drum 2 section to be formed, and a part of the storage tank 4 was treated. An apparatus having a liquid outlet so that the treatment liquid flows out was produced, and the raw liquid was treated under the same conditions as in Example 1. COD of the treatment liquid at the start of treatment is about 5 ppm (removal rate about 75%),
It was about 7 ppm (removal rate of about 65%) at the time of the integrated treatment amount of 3000 liters. After that, the treatment was continued up to 5000 liters, and the purification effect was almost the same at this time, but the purification effect was slightly lower than that of Example 1.

Comparative Example 2 A liquid purifying apparatus using the ozone treatment having the structure shown in FIG. 3 was produced, and the purifying treatment was performed using the same stock solution as in the example. Air 21 is introduced into the ozone generator 22 to create air having an ozone concentration of 15 mg / liter as in the case of Example 2, and this is supplied from the ozone supply unit 23 installed at the bottom of the storage tank 4 into which the stock solution 7 is introduced. It was injected into the stock solution (injection volume 3 liters per minute). The stock solution was supplied at a rate of 100 ml / min, and the COD of the processing solution 10 flowing out from the apparatus was measured. The treatment was carried out up to an integrated amount of 5000 liters as in the example. There is no difference in the COD of the processing liquid flowing out from the equipment at the start of processing and at the time of processing 5000 liters, approximately 9 ppm
(Removal rate: about 55%) was maintained, but the purification effect was low compared to the examples.

Comparative Example 3 A storage tank of the liquid purifying apparatus shown in FIG. 3 was filled with activated carbon similar to that used in Example 1 and the stock solution was introduced thereinto,
Further, ozone was injected to carry out purification treatment. The processing conditions such as the injection amount of ozone were the same as those in Comparative Example 2. The COD concentration of the treatment liquid immediately after the start of treatment is about 2 ppm (removal rate about 9
0%) and a high effect was obtained. It was estimated that this was due to the synergistic effect of adsorption by activated carbon and oxidative decomposition by ozone, but when treated with 3000 liters, about 7 ppm,
After that, the COD value was almost the same as that of Comparative Example 2 using only ozone (about 9 ppm when treated with 5000 liters, removal rate about 55%), and the effect of using activated carbon was not seen.

According to this comparative example, when the treatment is carried out by using the activated carbon and ozone together in the liquid, it is possible to obtain a superior removing effect at the initial stage of the treatment as compared with the case of using the treatment alone, but the synergistic effect thereof depends on it. It turns out that it will fall to. Even if activated carbon is installed in the contact area with the liquid and ozone is supplied there to decompose and remove the organic dissolved substances adsorbed on the activated carbon, the effect is not sufficiently obtained and the decomposition reaction occurs outside the contact area with the liquid. It can be seen that the present invention to be carried out has more excellent effects.

The liquid purification apparatus of the present invention has been described above based on an example in which ultraviolet irradiation and ozone treatment are used to decompose activated carbon as an adsorbent and organic dissolved substances in the liquid adsorbed by the adsorbent. With respect to configurations other than the above examples, various application examples can be adopted without departing from the scope of the invention.

[0038]

As described above, by using the liquid purification apparatus of the present invention, it becomes possible to safely and stably remove the organic dissolved substance in the liquid continuously over a long period of time. .. As a result, it becomes possible to effectively carry out purification of water systems such as river water, lakes and marshes, groundwater, etc. which are contaminated by various factors such as domestic drainage and pesticide spraying.
In addition, by treating various wastewater with the purification device of the present invention,
It becomes possible to effectively prevent water pollution.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a liquid purification device using the present invention.

FIG. 2 is a perspective view showing another example of the liquid purification apparatus using the present invention.

FIG. 3 is a schematic diagram showing a liquid purification apparatus of Comparative Example 2.

[Explanation of symbols]

 1 Adsorption Part 2 Rotating Drum 3 Starting Roll 4 Storage Tank 5 Lid 6 Container 7 Undiluted Solution 8 Undiluted Solution Introducing Line 9 Processing Solution Outlet 10 Processing Solution 11 Contact Section 12 Ultraviolet Lamp 13 Ultraviolet Irradiation Section 14 Decomposition Reaction Section 15 Partition 16 Rotating Valve 17 Discharge line 18 Discharge pump 20 Discharge nozzle 21 Air 22 Ozone generator 23 Ozone supply section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C02F 9/00 Z 8515-4D

Claims (3)

[Claims] 1. A contact portion of the liquid, which adsorbs a dissolved substance in the liquid to the adsorbent by immersing a liquid in the adsorbent, the adsorbing portion formed in a belt shape using the adsorbent, and the contact. A liquid purification apparatus configured to repeatedly and continuously pass through a decomposition reaction section for decomposing the dissolved substance adsorbed by the adsorbent provided outside the adsorbent, wherein one of the adsorption sections is provided in the contact section. The liquid purifying apparatus is characterized in that a flow of the liquid is formed such that the liquid passes from the surface of the liquid to the other surface of the liquid. 2. The liquid purification method according to claim 1, wherein the decomposition reaction section is provided with an ozone supply section, an ultraviolet irradiation section, or both. 3. The liquid purifying apparatus according to claim 1, wherein the adsorption unit passes through the liquid removal mechanism of the adsorption unit after passing through the contact unit.