KR101994502B1 - Packed column backwashing method - Google Patents

Packed column backwashing method Download PDF

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Publication number
KR101994502B1
KR101994502B1 KR1020147013047A KR20147013047A KR101994502B1 KR 101994502 B1 KR101994502 B1 KR 101994502B1 KR 1020147013047 A KR1020147013047 A KR 1020147013047A KR 20147013047 A KR20147013047 A KR 20147013047A KR 101994502 B1 KR101994502 B1 KR 101994502B1
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South Korea
Prior art keywords
water
backwashing
packed bed
packed
packed column
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KR1020147013047A
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Korean (ko)
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KR20140109365A (en
Inventor
노조무 이쿠노
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쿠리타 고교 가부시키가이샤
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters

Abstract

Provided is a method for cleaning a packed column in which the structure of the packed column is simple, and backwashing can be sufficiently performed. The hydrogen peroxide-containing water is passed through the packed column 1 having the packed bed 3 of granular activated carbon in a downward flow. When oxygen gas is present in the packed bed (3), the water discharge valve (13) is opened to lower the water level in the column, and backwash is carried out. During the backwashing, the water shutoff and stopping step is performed during the backwashing and backwashing process, and the bubbles are collected and the gas is released in a self-supporting manner.

Description

{PACKED COLUMN BACKWASHING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwashing method for a packed column in which raw water containing a gas generating component such as hydrogen peroxide-containing water is passed downward to perform a reaction or filtration. And a method for implementing the method. The present invention relates to a method of backwashing a packed column, which is preferable for backwashing a packed column in which hydrogen peroxide-containing water is passed through a packed column packed with granular activated carbon to decompose hydrogen peroxide.

When the hydrogen peroxide-containing water is passed through the granular activated carbon packed column to decompose the hydrogen peroxide, as described in paragraph 0015 of Patent Document 1, when the hydrogen peroxide-containing water comes into contact with the granular activated carbon layer, the decomposition reaction occurs immediately to generate oxygen It becomes bubbles trapped in the packed bed, and the aqueous solution is short-passed (channeling phenomenon) in the packed bed by the bubbles, leading to premature leakage of hydrogen peroxide. Thus, it is necessary to back up the packed bed. When the backwash is carried out in an upward flow, the activated carbon is held up by the oxygen gas accumulated in the packed bed and is liable to flow out of the tower.

As shown in Patent Documents 2 to 4, if the filtration device comprising filtration material filled in the filtration tower continues to flow downward, the back pressure is intermittently applied because the pressure loss increases gradually. Patent Documents 2 and 3 disclose a filtration device in which a baffle is formed in an upper portion of a filtration tower to prevent the filtration material from flowing out during backwashing and the filtration material is not raised to a higher level than the baffle in backwashing have. Patent Document 4 discloses that a wire net is provided so as to traverse the upper portion of the column in order to prevent the filter medium from flowing out of the column at the time of backwash.

However, when a baffle or a transverse wire net is formed in the upper part of the tower as in Patent Documents 2 to 4, the baffle and the wire net must be removed at the time of repair or replacement of the filler in the tower, so that the work becomes troublesome. In the case where a baffle or a wire mesh is not formed, the backwash flow rate can not be reduced so that the filler does not flow out during backwashing, and the backwash is liable to become insufficient.

(Patent Document 1) JP-A-7-171561 (Patent Document 2) JP-A-8-318107 (Patent Document 3) JP-A-2009-125657 (Patent Document 4) Japanese Laid-Open Patent Publication No. 2000-5511

The present invention solves the above-mentioned problems of the prior art and provides a method for backwashing a packed column in which raw water containing a gas generating component flows in a downward flow. The present invention provides a method for backwashing a packed column in which the structure of the packed column is simple, And to provide a backwashing method of a packed column which can be used.

The method for backwashing a packed column of the present invention is a method for backwashing a packed column in which a raw material containing a gas generating component is passed through a filling material in a packed column in a downward flow, A method for backwashing a packed column that performs a backwash process by passing wash water through an upflow stream, characterized by comprising the steps of stopping the packed bed by stopping the circulation of backwash water, And then the stationary water is passed again.

In the present invention, in the backwash process, the reverse water wash water is passed through in an upward flow, then the reverse osmosis water is stopped, or the water flow rate is reduced to stop the filling layer, and then the reverse osmosis water is again flowed upward . The packed bed is stirred by the first backwash water flow, a part of the gas in the packed bed is disappeared, and the minute bubbles in the packed bed are associated with each other and the bubbles are separated from each other. A portion of the associated bubbles remains in the packed bed, but is released from the packed bed during the quiescent process by its buoyancy. Thereafter, the bubbles which have remained are removed by backwashing with an upward flow.

In the present invention, the gas in the packed bed is sufficiently released from the packed bed in this manner. In addition, the backflow by the upflow water flow is not continuously performed but the stopping process is interposed therebetween, so that the filler is settled during the stopping process, thereby preventing the filler from flowing out.

In the present invention, it is not necessary to provide a baffle for preventing leakage of the filler or to install the screen on the upper part of the tower in the upper part of the packed column. Therefore, maintenance in the column and replacement of the filler can be easily performed.

In the present invention, a water discharge pipe having a strainer is formed in the packed column at a height of 100 mm or more from the upper surface of the packed bed, a water discharge valve is formed in the water discharge pipe, and the water discharge valve is opened It is preferable to perform the water discharge process and the backwash process. Since the strainer is formed in the water discharge pipe, the backwash flow rate is increased so that the filling material does not flow out to the water discharge pipe even if the water level in the column becomes higher than the water discharge pipe. Therefore, backwash flow rate can be increased to sufficiently perform backwashing.

Preferably, the raw water is hydrogen peroxide-containing water, and the filler is granular activated carbon. In this case, the first reverse water flow in the backwash process is carried out at an LV of 15 to 30 m / h, and the LV at the stop or decrease of the water flow is set to 5 m / h or less, and the LV 20 to 25 m / h is preferable.

In the backwashing method of the packed column of the present invention, since the water level in the column is lowered prior to the start of the backwash process, the flow of the filler during backwash is prevented.

1 is an explanatory diagram of a backwashing method of a packed column according to the embodiment.
2 is an explanatory diagram of a backwashing method of a packed column according to the embodiment.
3 is an explanatory diagram of a backwashing method of the packed column according to the embodiment.

Hereinafter, embodiments will be described with reference to the drawings. Figs. 1 to 3 are schematic longitudinal sectional views of a packed column to which the method of the present invention is applied. Fig. 1 shows a raw water supply process, Fig. 2 shows a water discharge process, and Fig. 3 shows a backwash process. In this embodiment, the hydrogen peroxide-containing water as raw water is passed through the packed column as a down stream, and hydrogen peroxide is decomposed into granular activated carbon in the column.

A support plate 2 capable of passing through the lower part of the packed column 1 is provided transversely and a packed bed 3 of granular activated carbon is formed thereon. The granular activated carbon preferably has an average particle size of 5 to 40 mesh, particularly 10 to 32 mesh, particularly preferably coal activated carbon.

A raw water pipe 6 having a raw water inlet valve 5 and an air pipe 8 having an air outlet valve 7 and a water outlet valve 9 having a reverse water outlet valve 9 are provided in a fluid inlet portion of a top portion of the packed column 1, Water outlet pipe 10 is connected.

In the packed column 1, a strainer 11 is provided at a height h higher than the top surface of the packed bed 4 when the packed bed 4 is stopped. A water discharge pipe 12 is connected to the strainer 11, And a water discharge valve 13 is formed in the water discharge pipe 12. As the strainer 11, a mesh or the like having a smaller opening diameter than the minimum particle diameter of the granular activated carbon can be used.

The height h is 100 mm or more, preferably 100 to 500 mm, and particularly preferably 200 to 300 mm.

There are no baffles other than the water discharge pipe 12 to which the strainer 11 is attached or a transverse wire mesh network above the packed bed 3 in the packed column 1. [

A fluid outlet portion at the bottom of the packed column 1 is provided with a treatment water pipe 16 having a treated water outlet valve 15 and a rinse water outlet pipe 18 having a rinse water outlet valve 17, Water inlet pipe 20 having a water inlet 19 is connected.

[Raw water supply process]

1, the raw water inlet valve 5 and the treated water outlet valve 15 are opened and the other valves are closed so that raw water composed of hydrogen peroxide-containing water flows downward into the packed bed 3 And the treated water is taken out from the treatment water pipe 16. The hydrogen peroxide-containing water preferably has a hydrogen peroxide content of about 100 to 500 mg / L, particularly about 200 to 400 mg / L. When this water supply is continued, the oxygen gas gradually accumulates in the packed bed 3. Then, the hydrogen peroxide is leaked into the treated water by the channeling phenomenon. Therefore, the hydrogen peroxide leaks are detected, or the backwashing process is performed after passing water for a predetermined time. A water discharge process is performed prior to the backwash process.

[Water release process]

The water discharge valve 7 and the water discharge valve 13 are opened and the other valves are closed so that the water level in the packed column 1 is discharged to the water discharge pipe 12, . By lowering the water level in the tower as described above, the activated carbon is prevented from reaching the tower top and flowing out during the backwash of the next step.

[Backwash process]

Thereafter, as shown in Fig. 3, the reverse water wash water inlet valve 19, the water discharge valve 13 and the reverse water wash water outlet valve 9 are opened and the other valves are closed, Pass through the upward flow. The upward flow rate at this time is set at a rate at which the granular activated carbon of the packed bed 3 does not flow out from the tower top. Specifically, the LV is preferably 15 to 30 m / h, particularly preferably 20 to 25 m / h. The first backwash is preferably carried out for 10 to 30 seconds, particularly 10 to 20 seconds. By this backwashing, the packed bed 3 is stirred, and a part of the oxygen gas accumulated in the packed bed 3 is released. In addition, minute oxygen gas bubbles are associated with each other, and a part thereof is released. The backwash water is discharged from the water discharge pipe (12) and the backwash water outlet pipe (10). Thereafter, the circulating water is stopped, or the LV is set to 5 m / h or less, particularly 2 m / h or less, and the packed bed 3 is stopped. The stopping step is preferably performed for 0.5 to 2 min, particularly 0.5 to 1 min. During this stopping process, a part of the associative bubbles accumulated in the packed bed 3 is raised by the buoyancy and is released from the packed bed 3. [

Subsequently, the stationary water is passed through again in an upward flow, and the second backwash is carried out. The LV and the duration time of the second backwash are preferably within the range of the first backwash condition.

After the completion of the second backwash, the second step of backwashing and the third backwashing may be carried out in order to carry out the washing step, which will be described later, and the higher-order stopping step and the backwashing step .

[Cleaning process]

After the backwashing process, the raw water inlet valve 5 and the washing water discharge outlet valve 17 are opened and the other valves are closed to flow raw water downward, and the packed bed 3 is washed to wash the washing water And discharged from the drainage outlet pipe (18).

Thereafter, the raw water inlet valve 5 and the treated water outlet valve 15 are opened and the other valves are closed, and the raw water supply process is resumed.

Thus, in this embodiment, the water level in the tower 1 is lowered to the level of the water discharge pipe 12 prior to the backwash, and the backwash water is discharged from the water discharge pipe 12 to which the strainer is attached during backwashing The activated carbon does not flow out of the tower even when the flow rate of the reverse water wash water is increased. In addition, in the backwash process, since the stopping step of precipitating the activated carbon is interposed between the upstream flow-through processes, the outflow of the activated carbon is also prevented. During this stopping process, the associated bubbles are released by their own buoyancy. Thus, the backwash can be sufficiently carried out and the gas can be sufficiently released. In addition, there is no baffle or a wire network in the transverse state in the upper part of the packed column 1, and the maintenance in the packed column and the replacement of the filler can be easily performed.

The present invention is preferably applied to a packed column in which hydrogen peroxide-containing water is passed through an activated carbon packed column to decompose hydrogen peroxide. However, the present invention can also be applied to a backwash of a filtration tower or a catalyst packed column in which various kinds of gas-dissolved water and a liquid which generates a gas by a reaction pass as raw water.

Example

Hereinafter, examples and comparative examples will be described.

[Example 1]

As shown in Fig. 1, an activated carbon layer 3 having a height of a stop layer of 1000 mm was filled in a column having a column diameter of 1000 mm and a column height of 2000 mm. h = 200 mm. Raw water (acid drainage, hydrogen peroxide concentration 300 mg / L) was passed through the packed column 1 at a rate of SV = 10 hr - 1 for 24 hours in a down stream. The concentration of hydrogen peroxide in the treated water was lower than the lower limit of detection (ND).

Next, the water level is lowered to the level of the water discharge pipe 12 by the water discharging process, and then the reverse water discharge valve 9, the water discharge valve 13 and the reverse water intake valve 19 are opened as shown in FIG. By

The first backwash (LV = 20 m / h, 10 sec)

Stop (1 min)

Second backwash (LV = 20 m / h, 10 sec)

, Followed by a washing step in which raw water was passed at SV = 10 hr - 1 for 15 min. Thus, the hydrogen peroxide-containing water was treated without spitting the activated carbon at all.

[Example 2]

In Example 1, reverse osmosis water was flown upwards at a small flow rate so that LV = 5 m / h instead of the stopping step. The rest were the same. According to the second embodiment, the hydrogen peroxide-containing water was treated without spitting the activated carbon at all.

[Comparative Example 1]

In Example 1, the backwash process after the water discharging process was carried out by closing the water discharge valve 13 and backwashing for 10 min (backwashing upward flow). The backwash LV is the same as in Example 1. The rest were the same. As a result, it was confirmed that 0.05% of activated carbon flows out by one backwash.

While the invention has been described in detail with reference to specific embodiments thereof, it is evident to those skilled in the art that various changes may be made therein without departing from the spirit and scope of the invention.

The present application is based on Japanese Patent Application (Japanese Patent Application No. 2011-265815) filed on December 5, 2011, which is incorporated by reference in its entirety.

Claims (4)

A method for backwashing a packed column in which hydrogen peroxide-containing raw water is passed downward through a packed bed of granular activated carbon as a filler in a packed column to reduce hydrogen peroxide and bubbles of oxygen generated are entrapped in a packed bed,
A backwashing method of a packed column in which a backwashing process is carried out after passing a backwash water in an upward flow after a water discharging process for lowering the water level in a packed column is performed,
In the backwashing process, reverse osmosis water is passed at a flow rate of 15 to 30 m / h, and the packed bed is stirred to separate a part of the bubbles accumulated in the packed bed from the packed bed, The backwash water is stopped or the backwash water is stopped to stop the packed bed to remove a part of the associating bubbles from the packed bed and then the backwash water is passed again at 20 to 25 m / Wherein the step of backwashing the bubbles remaining in the packed bed from the packed bed is carried out by developing the layer. The method according to claim 1,
A water discharge pipe having a strainer is formed in the packed column at an area of 100 mm or more higher than the upper surface of the packed bed and a water discharge valve is formed in the water discharge pipe,
And the water discharging step and the backwashing step are carried out by opening the water discharging valve. delete 3. The method according to claim 1 or 2,
And the LV at the time of stopping or reducing the flow rate is set to 5 m / h or less.
KR1020147013047A 2011-12-05 2012-12-04 Packed column backwashing method KR101994502B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011265815 2011-12-05
JPJP-P-2011-265815 2011-12-05
PCT/JP2012/081315 WO2013084854A1 (en) 2011-12-05 2012-12-04 Packed column backwashing method

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KR101994502B1 true KR101994502B1 (en) 2019-06-28

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JP6026842B2 (en) * 2012-10-12 2016-11-16 水ｉｎｇ株式会社 Cleaning method for water treatment equipment
CN103601263A (en) * 2013-12-03 2014-02-26 宜兴市裕泰华环保有限公司 Active carbon filter
JPWO2021182480A1 (en) * 2020-03-13 2021-09-16
KR102352538B1 (en) * 2021-07-16 2022-01-20 효림산업주식회사 Apparatus of Advanced water treatment and Operation Method Thereof

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WO2013084854A1 (en) 2013-06-13
JPWO2013084854A1 (en) 2015-04-27
JP5971257B2 (en) 2016-08-17
KR20140109365A (en) 2014-09-15

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