JPH0710386B2 - Water purification equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a water purification apparatus for purifying water quality of lakes and marshes, drinking water, or wastewater of factories, households, and the like.

[Problems to be Solved by Conventional Techniques and Inventions]

(1) In the case of lakes Recently, in order to improve the scenery of ponds in parks, for example, the quality of the water in the ponds is purified, the transparency of the water is increased, and the carps and goldfish released to the ponds are easier to see. Is being done.

Conventionally, in order to purify water quality, a method of removing suspended matter by providing a filter tank composed of sand or a honeycomb inside the apparatus, a method of using an algaecide such as chlorine or copper, or the inside of water A flocculant is added to the solution to flocculate suspended matter in water.

However, according to the method of removing a suspended matter by providing a filter tank composed of sand or a honeycomb inside the apparatus, the suspended matter is easily accumulated in the sand or the honeycomb, and the clogging is apt to occur, and the adsorption ability of the suspended matter is high. It is reduced and cleaning is troublesome.

Furthermore, according to the method of adding an algaecide such as chlorine or copper or a coagulant to the inside of water, it is possible to remove algae such as water-bloom and flocculate the suspended matter, but there are many algicides and flocculants. In this case, there are drawbacks such as death of carp and goldfish in water, and secondary pollution of water quality due to these chemicals.

(2) In the case of sewage treatment from factories and households In order to treat wastewater from factories and households, generally, in a sewage treatment plant, after physically treating the wastewater, chlorine is added to sterilize and the treated water is discharged. Is being done.

However, according to this method, aquatic plants and ornamental fish are killed by the influence of chlorine, and they cannot be used in ponds of parks where secondary water is desired to be used, which limits their use range.

(3) Water for drinking Water in lakes and reservoirs is used as tap water after being precipitated and filtered and then sterilized with chlorine. Recently, water containing fertilizer from drainage from neighboring factories and houses or fertilizer from farmland has been used. Enter into lakes and reservoirs, eutrophication progresses, cyanobacteria and green algae multiply abnormally in the water, and chemical substances (eg, borneol) secreted by these algae cause abnormal musty odor in tap water. To do.

Conventionally, as a method for preventing this, a method using a large amount of chlorine disinfection or adsorption on activated carbon has been used.

However, the use of chlorine has a drawback that humic substances newly contained in leaf litter and plant spoilage materials react with chlorine to generate a carcinogen (eg, trihalomethane).

In addition, activated carbon has a high adsorptivity, but it requires a large amount of equipment to reuse the activated carbon, which has the drawback of increasing the equipment cost.

[Object of the Invention]

The present invention has been made in view of the above points and is capable of easily removing dirt adhering to the outer wall of the jacket accommodating the sterilizing lamp and suspended matter accumulated in the filter medium, and also by chemical damage. There is no risk of carp or goldfish dying,
Moreover, it is an object of the present invention to provide a water purification apparatus that does not cause secondary pollution and that decomposes and removes carcinogens and that can be configured in a small size.

[Means for Solving the Problems]

The present invention has the following configuration in order to solve the above problems. That is, inside the filter medium storage tank, an appropriate number of sterilizing lamps housed in a jacket are stored, and when the water is located under the sterilizing lamp and the water is being purified, a part of the water is removed. Stores the filter material that is densely packed in.

An air diffuser is provided below the filter medium.

When water is being treated, the filter material absorbs suspended matter in the water, and during backwashing, the air from the air diffuser causes the filter material to float in the water, and the filter material or the filter material is a sterilization lamp. Contacting the jacket that stores the product, removes dirt and dust contained in the jacket and filter material.

As another structure, an ozone supply body is provided between an appropriate number of sterilizing lamps housed in a jacket inside a filter medium storage tank and a filter medium that is densely packed in a part of water, and the ozone action is performed. Sterilize pathogens in water (eg E. coli)
Photo-oxidizes and decomposes organic substances to reduce COD and BOD and odor components.

[Action]

According to the water purification apparatus described above, when the water in the filter medium storage tank is being treated, ultraviolet rays from the sterilization lamp are irradiated into the water to sterilize pathogenic bacteria (for example, Escherichia coli) in the water, and photooxidatively decompose organic matter, COD and BOD can be reduced and odor components can be reduced.

In addition, the filter material adsorbs suspended matter in water.

Further, when backwashing, the air from the air diffuser causes the filter material to float in the water, and the filter material or the filter material comes into contact with the jacket containing the sterilization lamp and is attached to the jacket. Dust can be removed and discharged to the outside.

By injecting ozone generated from a sterilization lamp or ozone from an ozonizer into water, pathogens in the water (for example, Escherichia coli) are further sterilized, and organic matter is photooxidatively decomposed to reduce COD and BOD and reduce odorous components. The reduction can be further promoted.

Further, by carrying out an ultraviolet ray treatment and an ozone treatment before the filter medium, ozone and water having an oxygen-containing component oxygen or oxide are produced. When this water passes between the filter media, a turbulent flow occurs between the filter media, promoting the reaction with COD and BOD in the water,
Purification of water is accelerated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is a filter medium storage tank, 2 is an appropriate number of sterilization lamps stored in a jacket 3, and for example, 12 sterilization lamps of 65 watts are stored. The jacket 3 is made of, for example, quartz glass. Reference numeral 4 denotes a filter medium located below the sterilization lamp 2 and housed on the upper surface of the net body 5. For example, thin chemical fibers are bundled into a ball shape to have a diameter of about 30 mm, for example, 40 cm to 40 cm. It is constructed by stacking with a thickness of about 50 cm. Further, the filter medium 3 is densely gathered on the upper surface of the mesh body 5 while purifying water, and by sending air from the air diffuser during backwashing,
The filter media or the filter media come into contact with the jacket, and the dirt adhering to the jacket and the dust contained in the filter media can be removed and discharged to the outside.

6 is an air diffuser located below the filter medium 3,
Send air into the water when backwashing. A water level sensor 7 detects the water level inside the filter medium storage tank 1. Reference numeral 8 is a water supply pipe, 9 is a treated water injection port, and 10 is a wastewater discharge hole in backwashing. 11 is a compressor for sending air into the water.

Further, as shown in FIG. 2, ozone generated from the sterilization lamp is injected into the water again through the ozone diffuser 12 to sterilize pathogenic bacteria (for example, Escherichia coli) in the water, photooxidatively decompose organic matter, and COD. It is also possible to further promote reduction of BOD and BOD and reduction of odorous components. Note that ozone sent from an ozonizer may be used.

Next, examples will be described.

[Experimental Example 1] Using the water purification apparatus of Fig. 1 described above, the pond water was circulated at a rate of 3 times a day in a pond of 50 m ³ in which carp is raised as an ornamental fish. As a result, the filter material contacted the quartz jacket during backwashing as shown in FIG. 3, and the transmittance of the ultraviolet rays 254 was higher than that of the control jacket in which the filter material did not contact the quartz jacket. It has an excellent maintenance rate.

The test jacket has less dirt on the jacket surface than the control jacket, and the outer surface of the jacket is cleaned
It only needs to be done once a year, which is significantly labor-saving compared to the monthly comparison jacket.

Further, the cleaning efficiency of the filter medium at the time of backwashing is improved, the separation of the trapped SS is facilitated as shown in Table 1, and it is effective in reducing the residual SS in the filter medium.

As a result, the filtration pressure increased, the pressure loss of the filter decreased significantly, and the SS concentration in the pond decreased, as shown in FIG.

[Experimental Example 2] The water purification apparatus of Fig. 2 described above was used to circulate 2.8 revolutions / day of pond water on a pond of 50 m ³ in which carp is raised as an ornamental fish. As a result, the water quality was purified as shown in Table 2.

In other words, as can be seen from Table 2, the amount of SS (suspension) gradually decreased and the transparency gradually increased, and fish shadows that were not visible in the pond due to the suspension were clearly visible after 3 days. It became so.

It can also be seen that COD (chemical oxygen demand) decreased and organic matter in water decreased.

Also, it can be seen that ORP (degree of activation of water) increases and activation of water gradually progresses.

[Experimental Example 3] Next, experimental results regarding changes in the amount of fish disease bacteria contained in water will be described.

As is clear from Table 3, the vibrio bacteria and the Aeromonas bacteria decrease with the lapse of time, and become zero on the 4th day.

The experimental results are the same as the conditions shown in Table 2.

[Experimental Example 4] Next, an experimental result using secondary treated water as raw water, which has been treated for sewage treatment in factories, households, etc., will be described according to Table 4.

The values of the treated water in Table 4 are the values after one-pass treatment by the water purification device described above.

According to the table, due to the removal of SS, the BO caused by the SS component
It can be seen that D and COD are reduced and water quality is improved.

Also, due to the ultraviolet rays and ozone generated from the lamp, E. coli becomes 0 after the single pass treatment, and BOD and COD decrease with the treatment, so organic substances such as humic substances which are the source of carcinogens decrease. The application range of treated water is expanded.

The experiment of Table 4 was carried out by using the apparatus shown in FIG.

As shown in FIG. 5, a treated water pouring port 13 is provided in the upper part of the filter medium storage tank 1 so that even if water flows backward in the filter medium storage tank 1, the treated water is treated to the same extent as the above-mentioned device shown in FIG. The effect can be obtained.

〔The invention's effect〕

As described above, the present invention, when purifying water, sterilizes pathogenic bacteria in water by irradiating water with ultraviolet rays from a sterilizing lamp and decomposes and removes organic substances that are sources of carcinogens. You can

Also, COD and BOD can be reduced and odor components can be reduced.
Furthermore, there is no risk of occurrence of secondary pollution.

In addition, the filter material can adsorb suspended solids in the water, can adsorb dust and the like in the water to effectively purify the water, and at the same time, the water that has been activated due to its increased oxidation ability by ultraviolet rays and ozone can be activated. It has the effect of facilitating water purification by facilitating contact with impurities such as COD and BOD.

Also, during backwashing, air from the air diffuser causes the filter material to float in the water, and either the filter material or the filter material comes into contact with the jacket containing the sterilization lamp and is attached to the jacket. Dust can be removed.

In particular, dirt adhering to the outer surface of the jacket is automatically cleaned every time backwashing is performed, so that the ultraviolet transmittance from the ultraviolet lamp in the jacket is restored. Therefore, the irradiation effect of ultraviolet rays in water is further increased.

In addition, the number of maintenance work for cleaning the outer surface of the jacket is reduced, which saves labor.

Further, since the cleaning degree of the filtering material is high, the filtering ability of the filtering material is increased, the pressure loss is small, and the filtering efficiency is further increased.

Furthermore, since the sterilization lamp and the filter medium are stored in the same filter medium storage tank, the device can be configured in a small size, and is useful as a device for purifying water quality in lakes, drinking water, and wastewater from factories and households. large.

[Brief description of drawings]

FIG. 1 is a side view of a water purification apparatus according to the present invention, FIG. 2 is a view of another embodiment, FIG. 3 is a view showing a change state of ultraviolet transmittance, and FIG. 4 is a change state of pressure loss. FIG. 5 and FIG. 5 are side views of the water purification device when water flows backward. 1 ... Filter material storage tank 2 ... Sterilization lamp 3 ... Filter material 6 ... Air diffuser

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Nobuhiro Suzuki No. 1 Kayaba, Kokufu-cho, Tochigi-shi, Tochigi Mitsui Miike Chemical Machinery Co., Ltd. (72) Yukio Takeda No. 1 Kayaba, Kokufu, Tochigi-shi, Tochigi Mitsui Miike Kakoki Co., Ltd. Examiner Masafumi Tominaga (56) References

Claims (2)

[Claims] 1. An appropriate number of sterilizing lamps housed in a jacket are housed inside a filter medium housing tank, and when the water is located below the sterilizing lamp to purify water, The filter material that is densely packed in a part of the water is stored, and an air diffuser is installed below the filter material. Furthermore, the air from the air diffuser causes the filter material to float in the water during backwashing. A water purification device characterized in that the water purification device is configured to come into contact with a jacket containing a sterilization lamp. 2. An ozone supplier is disposed between a suitable number of sterilizing lamps housed in a jacket inside a filter medium storage tank and a filter medium densely gathered in a part of water. The water purification apparatus according to claim 1.