JPH10131529A - Purification method of water for pool and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to economize an amout of supply water without damaging the effect of purification by making secondary purification of water pumped from a pool after primary purification to return the water to the pool, and returning reverse washing water after the reverse washing in a reverse washing process of secondary purification treatment to a supply side of primary purification treatment. SOLUTION: Water pumped from a pool 1 through a water supply pump 4 is supplied to a solid-liquid separator 6 through a water level adjusting tank 5 and is transferred to a filteration water tank 7, and secondary purification is made with a fine filter 3. Water purified by the secondary purification is partially flowed out from the filteration water tank 7 to a piping 11 through a branch pipe 9 to return to the pool 1, the remaining water is supplied to the fine filter 3 with a water supply pump 8 and is finely filtered, and it is returned to the pool 1 through pipings 10 and 11. Facilities for a reverse washing process are provided to a coarse filter 2 and the fine filter 3, the reverse washing water after the reverse washing is supplied to the water level adjusting tank 5 on the supply side of the coarse filter 2 for making primary purification treatment through a drain pipe 17, and pool water pumped from the pool 1 is mixed with the reverse washing water and is filtered again with the coarse filter 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for purifying pool water, and more particularly, to a pool which makes it possible to save pool replenishing water which is constantly replenished to maintain the purity of the pool water at a legally specified value. The present invention relates to a method and an apparatus for purifying water.

[0002]

2. Description of the Related Art Since the water in a swimming pool gradually becomes dirty as it is used, there is a legal regulation for maintaining the purity at a certain level for sanitary management. In order to maintain this legal standard, the pool is equipped with a purifying device, and high-purity water, such as tap water, is replenished over time before it becomes dirty to a level that cannot be treated by the purifying device.

Conventionally, a pool water purifying apparatus has been disclosed in, for example, JP-A-2-120465 and JP-A-7-195097, in which a rotary drum type solid-liquid separator separates water extracted from pool water. Primary purification, for example, 10
A solid content of μm or more is removed, and a secondary purification is performed by a hollow fiber membrane filtration device. For example, a fixed component of 0.3 μm or more is removed and returned to a pool.

[0004] In this case, the treated water after the primary purification is branched into two parts, a part of which is directly returned to the pool, and the rest is returned to the pool after being subjected to the secondary purification treatment. In some cases, all of the purified water is sent to a secondary purification process. In any case, the purified water subjected to the primary purification treatment is further subjected to microfiltration by the secondary purification treatment and returned to the pool by removing particles that could not be removed by the primary purification treatment substantially completely. This is because the amount of tap water to be replenished with time can be reduced over time.

Further, in a rotary drum type solid-liquid separation device for primary purification and a hollow fiber membrane filtration device for secondary purification, the filtering material gradually becomes clogged with fine particles as the treatment time elapses, and the purification performance gradually decreases. There is a phenomenon. In order to prevent a reduction in the purification capacity, each filtration device is usually provided with a so-called backwashing step for washing out fine particles adhering to the filter medium. Conventionally, the backwash water containing the fine particles washed in the backwash step as described above has been disposed of outside the pool water purification line. Therefore, it is necessary to replenish the amount equivalent to the backwash water discarded in this way with at least fresh tap water, which greatly affects the effect of reducing the amount of replenished water.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for purifying pool water which can reduce the amount of fresh makeup water such as tap water without impairing the original purifying effect of pool water. It is in.

[0007]

In order to achieve the above object, a method for purifying pool water according to the present invention comprises purifying water extracted from a pool with a coarse filtration device, and further purifying the primary purified water with a microfiltration device. In order to purify and return to the pool, the primary purification treatment is provided with a backwashing step of the filter medium of the coarse filtration device, and the secondary purification treatment is provided with a backwashing step of the filter material of the microfiltration device. In the method for purifying pool water, the backwashing water after backwashing in the backwashing step of the secondary purification treatment is returned to the supply side of the primary purification treatment.

The apparatus for purifying pool water according to the present invention further comprises a primary purification step in which water extracted from the pool is treated by a coarse filtration device, and a purified water treated in the primary purification step is further treated by a precision filtration device. And a secondary purification step for returning to the pool, and in the primary purification step and the secondary purification step,
In a pool water purifying apparatus provided with a backwashing step of backwashing the filter medium of each step with purified water of each step, the backwash water after backwashing in the backwashing step of the secondary purification step is subjected to the primary purification. It is characterized by providing a pipeline returning to the supply side of the process.

[0009] As described above, in the backwashing step in the secondary purification treatment, the backwash water, which has been conventionally discarded, is supplied to the supply side of the primary purification treatment step so as to return to the pool water purification line. Therefore, the amount of newly supplied tap water or the like can be reduced. In addition, the backwash water in the backwash step of the secondary purification process does not contain a solid having a larger particle size than that of the primary purification process, and thus does not impair the original purification effect.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram illustrating a pool water purifying apparatus according to the present invention. In the figure, 1
Is a swimming pool, 2 is a coarse filtration device for primary purification, and 3 is a microfiltration device for secondary purification. In the illustrated embodiment, a rotary drum type filtration device is used as the coarse filtration device 2, and a filter cloth for removing a solid content of 10 μm or more is used as the filter medium. Also, a hollow fiber membrane filtration device is used as the microfiltration device 3, and a hollow fiber membrane that removes a solid content of 0.3 μm or more is used as the filter medium.

Water extracted from the pool 1 by the water supply pump 4 is sent to a water level adjusting tank 5 and supplied from the water level adjusting tank 2 into a rotary drum type solid-liquid separator 6 of the coarse filtration device 2. . The water that has flowed into the solid-liquid separator 6 has a solid content of 10 μm or more filtered by a filter cloth wound around the drum.
It is primarily purified and moves to the filtration water tank 7. The water level adjusting tank 5 is provided with an overflow pipe 12. When the water level of the water level adjusting tank 5 rises to a certain level or more, the water flows into the filtered water tank 7 of the coarse filtration device 2 via the overflow pipe 12. .

The primary purified water is sent from the filtration water tank 7 to the microfiltration device 3 by the water supply pump 8, where it is subjected to secondary purification so that the solid content of 0.3 μm or more is removed by the hollow fiber membrane. . In the illustrated embodiment, the purified water that has been subjected to the primary purification is partially supplied from the filtered water tank 7 through the branch pipe 9 to the pipe 11.
To the pool 1 and the remaining purified water is sent to the microfiltration device 3 by the water supply pump 8 as described above, is microfiltered, and is returned to the pool 1 via the pipes 10 and 11. . Here, the branch pipe 9 may be provided as needed, and the entire purified water filtered by the coarse filtration device 2 may be sent to the fine filtration device 3.

Each of the rough filtration device 2 and the fine filtration device 3 for performing the primary purification treatment is provided with equipment for a backwashing step. The coarse filtration device 2 is provided with a washing nozzle 13 extending from the filtration water tank 7 above the rotary drum type solid-liquid separator 3, and is intermittently washed toward the filter cloth on the solid-liquid separator 3. By spraying water, the solid matter attached to the filter cloth is washed away (backwashed). The backwash water after the washing is disposed outside the pool water purification line through the discharge pipe 14.

Further, the microfiltration device 6 is provided with a water storage tank 15 for storing a part of the secondary purified water and a water feed pump 16 for backflowing the water in the water storage tank 15 toward the microfiltration device 6 at regular intervals. Then, the water supply pump 16 back-washes the purified water by flowing the purified water back toward the hollow fiber membrane inside the microfiltration device 6. Such backwash treatment method, if the filter medium is a hollow fiber membrane, it is preferable that the backwash water per backwashing the hollow fiber membrane area 10 m ² per 5 to 15 liters.

The backwash water after the backwash is sent to a water level adjusting tank 5 which is a supply side of a coarse filtration device 2 for performing a primary purification treatment via a discharge pipe 17, and the pool water extracted from the pool 1 here. And filtered again by the coarse filtration device 2. Further, a coagulation tank 18 may be provided in the middle of the discharge pipe 17 as shown in the figure, and the solid content may be coagulated and settled before returning to the water level adjustment tank 5.

The solid content captured by the hollow fiber membrane of the microfiltration device 3 has a small particle size, and the distribution of the particle size is relatively larger than the distribution of the particle size in the pool water.
Even if it is sent to the water level adjustment tank 2 as it is, a considerable amount can be removed by the coarse filtration device 2. If the degree of purification of the filtered water of the coarse filtration device 2 is reduced by the inflow of the backwash water of the microfiltration device 3 and affects the visibility of the pool water, the discharge pipe is used as in the illustrated embodiment. There is no problem if the coagulation tank 18 is installed in the middle of 17 and treated with a coagulant.

In the conventional purifying apparatus, the backwash water discharged from the backwashing step of the microfiltration apparatus 3 is discarded as described above, but this is returned to the supply side of the coarse filtration apparatus 2 as described above. By repurifying and returning to the purification line, the amount of fresh tap water supplied can be reduced.

[0018]

[Example] The volume is 300m ³ and the number of swimmers is 4 on average per day.
The purification device of the present invention equipped with the following rotary drum type solid-liquid separation device and hollow fiber membrane filtration device was installed in an indoor pool of 00 persons. Rotating drum type solid-liquid separator: processing capacity 2500 m ³ / day.

The pool water is turned for 6 turns / 24 hours continuous operation.
Treated at the rate of day, treated water volume 75m ³ / hr. Hollow fiber membrane filtration device: a polysulfone hollow fiber membrane that captures a particle size of up to about 0.1 μm is configured as a membrane area of 240 m ² . Processing at a rate of 1 turn / day in continuous operation for 24 hours,
Treated water volume 12.5m ³ / hr, backwashing process every 15 minutes 3
This was carried out for 0 second at a backwashing water amount of 0.25 m ³ / time, and no coagulant was added to the backwashing water returned to the primary purification side.

As a result of performing the above operation for three months, the visibility of the pool water in the morning was 25 m, and it was confirmed that the pool water quality as usual can be maintained. In addition, the supply amount of tap water was conventionally 1200 m ³ / month, but 450 m in the above operation.
m ³ / month, a saving of about 1/3.

[0021]

As described above, according to the present invention, in the backwashing step in the secondary purification treatment, the conventionally discarded backwash water is returned to the supply side of the primary purification treatment step, so that it is newly provided. The amount of replenishment of tap water or the like to be reinforced can be reduced. Further, the backwashing water in the backwashing step of the secondary purification treatment does not contain a solid content having a larger particle diameter than that of the primary purification treatment, so that the original purification treatment effect can be prevented from being impaired.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a pool water purification device according to an embodiment of the present invention.

[Description of Signs] 1 Pool 2 Coarse Filtration Device 3 Precision Filtration Device 4,8 Water Pump 5 Water Level Adjustment Tank 10, 11 (Return) Pipe 15 (For Backwash) Water Storage Tank 16 (For Backwash) Water Pump 17 Discharge pipe (backwash water) 18 Coagulation tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 65/02 C02F 1/52 Z C02F 1/52 B01D 35/02 Z

Claims (6)

[Claims] 1. The water extracted from a pool is subjected to primary purification by a coarse filtration device, the primary purified water is further secondary-purified by a microfiltration device, and returned to the pool. In the method of purifying pool water, wherein a backwashing step of the filter medium of the apparatus and a backwashing step of the filter medium of the microfiltration apparatus are provided in the secondary purification treatment, respectively, A method for purifying pool water in which backwash water after washing is returned to a supply side of the primary treatment. 2. The pool water purifying method according to claim 1, wherein the backwash water is subjected to a coagulation treatment in the course of returning the backwash water to a supply side of the primary purification treatment. 3. The filter medium of the microfiltration device is a hollow fiber membrane, and the amount of backwash water for each backwash of the hollow fiber membrane is determined by measuring a hollow fiber membrane area of 10
method for purifying pool water as claimed in claim 1 or 2 to m ² per 5 to 15 liters. 4. A primary purification step in which water extracted from the pool is treated by a coarse filtration device, and a secondary purification step in which purified water treated in the primary purification step is further treated by a microfiltration device and returned to the pool. Wherein the primary purification step and the secondary purification step are provided with a backwashing step of backwashing the filter medium in each step with purified water in each step. An apparatus for purifying pool water, comprising a pipeline for returning backwash water after backwashing in the backwash step to the supply side in the primary purification step. 5. The apparatus for purifying pool water according to claim 4, wherein a flocculation treatment tank is provided on a path on the way of returning the backwash water in the backwashing step in the secondary purification step to the supply side in the primary purification step. 6. The pool water purifying apparatus according to claim 4, wherein the filter medium of the coarse filtration apparatus is a cloth, and the filter medium of the fine filtration apparatus is a hollow fiber membrane.