CN210419345U - Decoloration jar - Google Patents

Abstract

The utility model relates to a decoloration jar, include: the tank body (1) is provided with a heat-insulating layer at the periphery; the tank cover (2) is detachably connected with the tank body (1); a support (3) for supporting the tank (1) from the bottom; the maintenance ladder (4) is connected to the back of the tank body (1); be provided with in the decoloration jar with its inside space halving separator (5), separator (5) include from cover (2) extend to jar body (1) inside below baffle (501) and with baffle (501) are connected and extend to the logical water grid net (502) of the inside bottom of jar body (1). The utility model discloses can let waste water carry out the second grade and filter, unload more thoroughly, easy maintenance, prevent stifled and can clearly observe the decoloration condition.

Description

Decoloration jar

Technical Field

The invention relates to the field of wastewater treatment, in particular to a decoloring tank.

Background

In the production process of chemical industry, pharmacy, printing and dyeing and other industries, a large amount of colored wastewater is generated, and in order to reach the discharge standard, activated carbon adsorption decoloration is generally used at present. The main decolorizing equipment is a decolorizing tank which is a single-stage adsorption tank at present, and wastewater enters the tank from an inlet, is decolorized by active carbon and is discharged from an outlet. Although the decoloring tank with only single-stage adsorption function can basically realize the decoloring function, the problems of poor decoloring effect, inconvenience in cleaning, incomplete discharging, inconvenience in maintenance and inconvenience in observing the decoloring condition caused by uneven contact of the activated carbon and the wastewater still exist.

Disclosure of Invention

The invention aims to provide a decoloring tank which can realize two-stage decoloring and filtering of wastewater, more thorough discharging, convenient maintenance, blockage prevention and clear observation of decoloring conditions.

In order to achieve the aim, the invention provides a decoloring tank which comprises a tank body, wherein the periphery of the tank body is provided with a heat-insulating layer;

the tank cover is detachably connected with the tank body;

a support supporting the can body from a bottom;

the maintenance ladder is connected to the back of the tank body;

the decolorizing tank is internally provided with a partition which divides the inner space of the decolorizing tank into two equal parts, and the partition comprises a baffle plate extending from the tank cover to the lower part of the inner part of the tank body and a water passing grid net connected with the baffle plate and extending to the bottom of the inner part of the tank body;

the tank cover is provided with a water inlet mechanism for introducing wastewater and a water outlet mechanism for obtaining produced water, which respectively correspond to two spaces separated by the partition in the decolorizing tank;

the cover or still be provided with on the jar body two with in the decoloration jar by two spaces that the separator is divided correspond respectively be used for letting in the feed inlet of active carbon.

According to one aspect of the invention, the decolorization tank further comprises two discharge openings for discharging waste material, which are arranged at the bottom of the tank body and correspond to two spaces in the decolorization tank, which are separated by the partition.

According to one aspect of the invention, the decoloration tank further comprises a back washing mechanism which is arranged at the bottom of the tank body and is respectively communicated with the two spaces separated by the partition in the decoloration tank.

According to one aspect of the invention, the decolorization tank further comprises an observation window arranged on the tank cover and used for observing decolorization in the decolorization tank.

According to one aspect of the invention, the water inlet mechanism comprises a water inlet pipe, a water inlet pressure gauge arranged on the water inlet pipe and a first branch pipe communicated with the water inlet pipe to realize water inlet sampling and back flushing of the water inlet pipe;

and a valve for opening and closing the pipeline is arranged on the first branch pipe.

According to one aspect of the invention, the water outlet mechanism comprises a water production pipe, a water production pressure gauge arranged on the water production pipe, a second branch pipe communicated with the water production pipe for water production sampling and a third branch pipe communicated with the water production pipe for backwashing the water production pipe;

and the second branch pipe is provided with a valve for opening and closing the pipeline.

According to one aspect of the invention, one end of the water production pipe extending into the decoloring tank is provided with a water production collecting pipe for collecting decolored water;

the water production collecting pipe comprises a main pipe communicated with the water production pipe and a plurality of branch pipes which are detachably connected with the main pipe and are arranged in parallel.

According to one aspect of the invention, a plurality of the branch pipes which are arranged in parallel with each other are arranged along the radial direction of the decoloration tank, and the length of each branch pipe is matched with the inner wall of the decoloration tank;

the branch pipe is made of a stainless steel filter screen, and the mesh of the filter screen is 500-1000.

According to one aspect of the invention, the end part of the tank body close to the tank cover is provided with a grid net, the grid net is connected with the baffle, and the grid net, the baffle and the tank cover together form a cavity for accommodating the produced water collecting pipe.

According to one aspect of the invention, the backwashing mechanism comprises a backwashing pipe, a connecting pipe which is communicated with the backwashing pipe and is provided with two pipelines which are respectively communicated with two spaces separated by the separator in the decoloration tank, and a fourth branch pipe which is communicated with the backwashing pipe and is used for water sampling;

and valves for opening and closing the pipelines are arranged on the two pipelines of the connecting pipe and the fourth branch pipe.

According to one scheme of the invention, the decoloration tank is divided into a left space and a right space by the partition, wastewater flows downwards in the space on one side where the water inlet mechanism is located, and flows upwards in the space on one side where the water outlet mechanism is located, so that the wastewater is subjected to two-stage filtration, most of impurities in the wastewater are adsorbed by activated carbon on the right side of the tank body after the wastewater is subjected to first-stage filtration, the efficiency of second-stage filtration is greatly improved, and the decoloration effect after the second-stage filtration is more thorough.

According to one scheme of the invention, the third branch pipe in the water outlet mechanism is a backwashing water inlet pipe, the first branch pipe in the water inlet mechanism is a water inlet sampling pipe and a backwashing water outlet pipe at the same time, and backwashing water on the left side flows in from the third branch pipe connected to the water production pipe and flows through the water production collecting pipe to perform backwashing. And backwashing water flows in from the water inlet pipe and flows out from the first branch pipe during backwashing on the right side, so that backwashing is carried out on the water inlet mechanism. Therefore, the invention effectively prevents the pipeline from being blocked.

According to one scheme of the invention, the bottom of the tank body is provided with a back flushing mechanism, so that back flushing water can be introduced from a back flushing pipe, flows through the connecting pipes which are separated at the left side and the right side by the separating piece and then is flushed into the tank body, and solid waste blocking the water passing grating net is flushed away, thereby realizing the anti-blocking function. When unloading, the solid waste material that is washed from logical water grid net by the backwash water can discharge at two discharge openings for unload more thoroughly. The backwashing water can also flush part of the activated carbon, so that the part of the activated carbon deposited at the bottom can adsorb some impurities, and the cost is greatly saved.

According to one scheme of the invention, the tank body and the tank cover of the decoloring tank are detachably connected, the tank body is welded with the maintenance ladder, the tank cover is provided with the handle by hand, and during maintenance, an operator can climb up the maintenance ladder and detach the tank cover through the handle to maintain the decoloring tank, so that the maintenance is very convenient.

According to one scheme of the invention, the side, close to the maintenance ladder, of the tank cover is provided with the observation window, so that an operator can climb up the maintenance ladder and observe the decoloration condition through the observation window, and when the observation window becomes fuzzy due to water mist in the decoloration tank, the tank cover can be detached to wipe the observation window, so that the operator can clearly observe the decoloration condition.

Drawings

FIG. 1 is a front view schematically showing a decolorizing tank removing bracket and an access ladder according to one embodiment of the present invention;

FIG. 2 is a structural view schematically showing a separator of a decolorizing tank, according to one embodiment of the present invention;

FIG. 3 is a block diagram schematically illustrating a water production collection pipe of a decoloring tank according to an embodiment of the present invention;

FIG. 4 is a sectional view schematically showing a decoloring tank according to an embodiment of the present invention;

FIG. 5 is a front view schematically illustrating a decolorizing tank removal backwash mechanism, according to one embodiment of the present invention;

fig. 6 is a plan view schematically showing a decoloring tank according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Fig. 1 is a front view schematically showing a decolorizing tank according to an embodiment of the present invention without showing a bracket and an access ladder, and fig. 2 is a structural view schematically showing a partition of the decolorizing tank according to an embodiment of the present invention.

As can be seen from fig. 1 and 2, the decolorizing tank of the present invention comprises a tank body 1, a tank cover 2, and a separator 5. Jar body 1 comprises the cylinder of top and the downward protruding calotte of bottom, in order not to let the waste water cool off too fast and influence the decoloration effect, jar body 1 periphery is equipped with the heat preservation. The left upper end of the tank body 1 in the figure is provided with a feed inlet 8 for leading the activated carbon into the tank body 1. The tank cover 2 is an upward convex dome and is detachably connected with the tank body 1, and in order to realize detachable connection, buckles can be arranged at the connection part of the tank body 1 and the tank cover 2, so that the tank cover 2 can be completely separated from the tank body 1 during detachment; the two can be connected in a hinge mode to realize opening and closing, and the function of the can cover 2 in the invention can also be realized.

The partition 5 comprises a baffle 501 and a water passing grid net 502, the baffle 501 is in a flat plate shape, one section of the baffle is rectangular, the other section of the baffle is connected with the rectangular part and extends towards the part far away from the rectangular part to form an arc with a shape matched with the shape of the dome inside the tank cover 2, so that the partition 5 can simultaneously divide the tank cover 2 into two spaces after the tank cover 2 is combined with the tank body 1; the length of the long side of the rectangular part of the baffle 501 is equal to the depth of the cylindrical part above the tank body 1, and the width of the wide side is equal to the diameter of the central hole of the cylinder above the tank body 1. One end of the water passing grid net 502 is connected with one end of the rectangular part of the baffle 501 far away from the circular arc part, and the other end extends towards the direction far away from the baffle 501 to form a circular arc with the shape matched with the bottom dome of the tank body 1. The spacer 5 is installed such that the upper end of the baffle 501 is flush with the upper opening of the can body 1, and is welded to the can body 1, and the spacer 5 divides the can body 1 and the can lid 2 into two spaces, i.e., left and right spaces as shown in fig. 1. The upper right side of the tank cover 2 in the figure is provided with a feed inlet 8 with the same function as that of the tank body 1, and when the tank cover is arranged on the tank body 1, the connecting line of the two feed inlets 8 on the tank body 1 and the tank cover 2 is vertical to the baffle 501.

The tank cover 2 is further provided with a water outlet mechanism 7 and a water inlet mechanism 6 which are separated on the left and right sides in fig. 1 by a partition 5. The water inlet mechanism 6 comprises a water inlet pipe 601, a water inlet pressure gauge 602 welded on the water inlet pipe 601, and a first branch pipe 603 welded on the water inlet pipe 601 and communicated with the water inlet pipe 601. The water outlet mechanism 7 comprises a water production pipe 701, a water production pressure gauge 702 welded on the water production pipe 701, a second branch pipe 703 welded on the water production pipe 701 and communicated with the water production pipe 701, and a third branch pipe 704 communicated with the water production pipe 701. Both the water inlet pipe 601 and the water production pipe 701 are welded to the tank cover 2.

Fig. 3 is a view schematically showing a water production collecting pipe of a decoloring tank according to an embodiment of the present invention, and as can be seen from fig. 1 and 3, the water production pipe 701 further includes a water production collecting pipe 7011 extending into the inside of the tank cover 2. The water production collecting pipe 7011 includes a main pipe 7011a welded to and communicated with the water production pipe 701, and a plurality of branch pipes 7011b each screwed to the main pipe 7011a and arranged in parallel to each other, that is, the branch pipes 7011b are detachably connected to the main pipe 7011 a. The plane of the plurality of branch pipes 7011b arranged in parallel is parallel to the plane of the lower opening of the tank cover 2, is positioned above the lower opening of the tank cover 2 and is arranged along the radial direction of the lower opening of the tank cover 2, and the length of the branch pipes 7011b is gradually reduced from the center to two sides, so that the water production collecting pipe 7011 can be matched with the arc shape of the inner wall of the inner dome of the tank cover 2. Wherein each branch pipe of the branch pipe 7011b is made of a stainless steel filter screen, the mesh of the filter screen is 800-1000, and the final impurity removal operation is finally realized through the stainless steel filter screen after the wastewater is decolorized, so that the decolorization rate is improved.

According to fig. 1, the bottom of the tank 1 is provided with a back-flushing mechanism 10 and two discharge openings 9 separated on the left and right by a partition 5. The back washing mechanism 10 comprises a back washing pipe 1001, two connecting pipes 1002 welded to the tank 1 and communicated with the back washing pipe 1001 and having two pipes respectively communicated with two spaces partitioned by the partition 5 in the tank 1, and a fourth branch pipe 1003 welded to the back washing pipe 1001 and communicated with the partition 5. Two discharge openings 9 are all welded on the jar body 1, and the distance between two discharge openings 9 is greater than the distance between two connecting pipes 1002. The first branch pipe 603, the second branch pipe 703, the pipelines of the two connecting pipes 1002 and the fourth branch pipe 1003 in the decolorizing tank are all provided with butterfly valves for opening and closing the pipelines. Any valve capable of opening and closing a line is contemplated by the present invention.

Fig. 4 is a sectional view schematically showing a decoloring tank according to an embodiment of the present invention. As can be seen from fig. 4, the bleaching tank of the present invention further comprises a grid net 13. The grid net 13 is arranged at the end part of the tank body 1 close to the tank cover 2, and the grid net 13 is connected with the baffle 501. The grid net 13 is a compact semicircular net structure and is positioned on one side, which is separated by the separator 5 from the tank body 1 and is close to the feed inlet 8 of the pipe body 1, the straight edge of the grid net coincides with and is welded with the baffle 501, and the arc edge of the grid net coincides with and is welded at the opening of the tank body 1, so that the grid net 13, the baffle 501 and the tank cover 2 jointly form a cavity for accommodating the produced water collecting pipe 7011. And the size of each square grid of the grid net 13 is slightly smaller than the size of the activated carbon particles, so that the activated carbon particles are prevented from floating into one side of the water outlet mechanism 7 due to buoyancy.

Fig. 5 is a front view schematically showing a decoloring tank according to an embodiment of the present invention without showing a backwashing mechanism, and fig. 6 is a plan view schematically showing the decoloring tank according to an embodiment of the present invention. As can be seen from fig. 5 and 6, the decolorizing tank according to the present invention is welded to two brackets 3 and an access ladder 4 on the tank body 1. The support 3 of the present invention is also divided into left and right side supports 3 by a partition 5 for supporting the can body 1 from the bottom. The top of the tank cover 2 is also provided with an observation window 11 and a handle 12 which is welded on the left side and the right side and is separated by the separating piece 5, so that an operator can conveniently detach the tank cover 2. The access ladder 4 should be located the central line department of both sides handle 12 to be convenient for operating personnel to climb up the access ladder 4 and dismantle cover 2 through cover 2 top handle 12, and can play the effect of supporting jar body 1 from the bottom jointly with two supports 3. The observation window 11 is a circular viewing mirror which is a circular structure made of high-strength transparent materials, and the decoloration condition of the decoloration tank is observed through a perspective observation port and is used for observing the decoloration condition in the decoloration tank. Due to the liquid environment inside the decolorizing tank, water mist can appear on the upper and inner sides of the observation window 11, which affects the sight, so the observation window 11 needs to be wiped frequently. However, the structure similar to the observation window 11 in the prior art is mostly located on the tank 1, and the operator needs to enter the tank 1 during wiping, which is very inconvenient. The viewing window 11 of the present invention is fixed to the removable can lid 2 and only the can lid 2 needs to be removed when wiping is required. In order to facilitate the operator to observe the inside condition of the decolorizing tank through the observation window 11, the observation window 11 should be arranged close to the access ladder 4.

The above description mainly describes the structure of the decoloring tank according to an embodiment of the present invention, and therefore, with reference to fig. 1 to 6, the operation of the decoloring tank according to the present invention is described, in which activated carbon is poured into the decoloring tank from the feed ports 8 of the tank body 1 and the tank cover 2, respectively, such that the two spaces partitioned by the partition are filled with activated carbon. Then the wastewater to be decolorized is introduced from the water inlet pipe 601, and the butterfly valve of the first branch pipe 603 is opened at the moment, so that the wastewater flows out from the first branch pipe 603 to finish sampling the wastewater to be decolorized. The inlet pressure gauge 602 on the inlet pipe 601 can measure and display the pressure of the wastewater introduced into the inlet pipe 601. The wastewater introduced at this time flows down into the right space partitioned by the partition 5 in the decoloring tank shown in fig. 1 and is mixed and decolored with the activated carbon therein, thereby completing the first-stage filtration.

Then the wastewater enters the space on the left side of the decolorization tank shown in FIG. 1 partitioned by the partition 5 through the water passing grille net 502 on the lower part of the partition 5, and flows upward to be mixed with the activated carbon in the space on the left side of the tank body 1 for decolorization. Because the water-passing grille net 502 is a compact net structure, the size of each net is slightly smaller than the size of the active carbon particles, so that the active carbon which adsorbs impurities in the right space can not enter the left space along with the wastewater, and the decoloring efficiency is ensured. At this time, the butterfly valve of the connecting pipe 1002 positioned on the right side of the partition 5 is opened, so that the wastewater can pass through the connecting pipe 1002 and the backwashing pipe 1001, and the butterfly valve of the fourth branch pipe 1003 is opened again, so that the wastewater flows out from the fourth branch pipe 1003 to finish sampling the wastewater subjected to the first-stage filtration, and the decolorization condition of the first-stage filtration is mastered.

When the mixed liquid of waste water and the active carbon in the left space flows to the water outlet mechanism 7, the mixed liquid passes through the grid net 13 which is also in a dense net structure, so that the active carbon particles in the left space can be blocked by the grid net 13, and the active carbon particles are prevented from entering the tank cover 2. The waste water passing through the grid net 13 enters the branch pipe 7011b of the water production collecting pipe 7011 made of stainless steel filter screen to complete the final impurity removal operation, and finally flows into the water production pipe 701 through the main pipe 7011a connected with the branch pipe 7011b and flows out through the water production pipe 701 to obtain the water production. At this time, the butterfly valve on the second branch pipe 703 is opened, so that the decolored wastewater in the water production pipe 701 flows out from the second branch pipe 703 to finish sampling of the second stage filtration, thereby mastering the decoloration condition of the second stage filtration. A water production pressure gauge 702 located on the water production pipe 701 may measure and display the water output pressure in the water production pipe 701.

Activated carbon at the bottom of the tank body 1 adheres to the water grid net 502 to cause blockage, and when discharging through the two discharge openings 9 at the bottom of the tank body 1, a part of wet solid waste material adheres to the inner wall of the tank body 1, so that the solid waste material cannot be completely discharged. Therefore, the decolorizing tank of the present invention is provided with a back-flushing mechanism 10 at the bottom of the pipe body 1. During backflushing, the butterfly valve on the fourth branch pipe 1003 is closed, backflushing water is introduced from the backflushing pipe 1001, and the backflushing water flows into the pipeline correspondingly communicated with the two spaces separated by the partition 5 in the tank body 1 from the connecting pipes 1002 positioned at the two sides of the partition 5 and is flushed into the tank body 1 for backflushing. At this time, the solid waste blocking the water passing grille net 502 can be washed away by the back flushing water, so that the anti-blocking function is realized. During the discharge, the solid waste material flushed by the backwash water from the water grid can be discharged at the two discharge openings, so that the decolouring tank according to the invention discharges more thoroughly than the prior art. Furthermore, a part of the activated carbon in the decoloration tank still has a partial adsorption function, and the back flushing water flushed into the tank body 1 from the connecting pipe 1002 can flush activated carbon particles, so that the activated carbon deposited at the bottom can adsorb impurities, and the cost is greatly saved.

Because the filter screen of the branch pipe 7011b of the water production collecting pipe 7011 is blocked due to excessive impurities attached, the water production rate of the water production pipe 701 is influenced, and therefore backwashing should be performed at regular time; the right inlet pipe 601 is also easily clogged by impurities in the introduced wastewater, and thus should be backwashed. And (3) backwashing the decoloring tank by calculating the pressure difference between the pressures measured by the water inlet pressure gauge 602 and the water production pressure gauge 702. The left backwash water is fed through a third branch pipe 704 connected to the product water pipe 701 and backwashed through a product water collecting pipe 7011. When the right side is backwashed, the backwash water is introduced from the water inlet pipe 601 and flows out from the first branch pipe 603, and the first branch pipe 603 simultaneously takes charge of water inlet sampling and backwash water outlet. The backwash water may be the produced water of the water outlet means 7 or cleaner water.

As can be seen from the above description, the decolorizing tank according to the present invention is divided into two spaces by the partition 5, so that the present invention can implement two-stage (i.e. twice) decolorizing filtration of the first stage and the second stage of wastewater, and most of the impurities in the wastewater after the wastewater is subjected to the first stage filtration are adsorbed by the activated carbon on the right side of the tank body 1, so that the efficiency of the second stage filtration is greatly improved, and the decolorizing effect after the second stage filtration is more thorough.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A decolorizing tank, comprising:

the tank body (1) is provided with a heat-insulating layer at the periphery;

the tank cover (2) is detachably connected with the tank body (1);

a support (3) for supporting the tank (1) from the bottom;

the maintenance ladder (4) is connected to the back of the tank body (1); it is characterized in that the preparation method is characterized in that,

a partition (5) for dividing the inner space of the decoloration tank into two equal parts is arranged in the decoloration tank, the partition (5) comprises a baffle (501) extending from the tank cover (2) to the lower part of the inner part of the tank body (1), and a water passing grid net (502) connected with the baffle (501) and extending to the bottom of the inner part of the tank body (1);

the tank cover (2) is provided with a water inlet mechanism (6) for introducing waste water and a water outlet mechanism (7) for obtaining produced water, which respectively correspond to two spaces separated by the partition (5) in the decoloration tank;

the cover (2) or the tank body (1) is also provided with two feed inlets (8) which are respectively corresponding to the two spaces separated by the partition (5) in the decoloration tank and are used for introducing activated carbon.

2. The digester as claimed in claim 1, further comprising two discharge openings (9) for discharging waste material provided in the bottom of the tank body (1) and corresponding to two spaces in the digester separated by the partition (5).

3. The digester as claimed in claim 1, further comprising a back-washing mechanism (10) disposed at the bottom of the tank body (1) and communicating with two spaces inside the digester separated by the partition (5), respectively.

4. The decolorizing tank of claim 1, further comprising an observation window (11) disposed on said tank cover (2) for observing decolorization within said decolorizing tank.

5. The decolorizing tank of claim 1, wherein said water inlet mechanism (6) comprises a water inlet pipe (601), a water inlet pressure gauge (602) disposed on said water inlet pipe (601), and a first branch pipe (603) communicating with said water inlet pipe (601) for sampling and backwashing said water inlet pipe (601);

and a valve for opening and closing the pipeline is arranged on the first branch pipe (603).

6. The decolorizing tank of claim 1, wherein said water outlet mechanism (7) comprises a water production pipe (701), a water production pressure gauge (702) disposed on said water production pipe (701), a second branch pipe (703) communicating with said water production pipe (701) for water production sampling, and a third branch pipe (704) communicating with said water production pipe (701) for backwashing said water production pipe (701);

and a valve for opening and closing the pipeline is arranged on the second branch pipe (703).

7. The bleaching tank according to claim 6, wherein one end of the water production pipe (701) extending into the bleaching tank is provided with a water production collecting pipe (7011) for collecting the bleached water;

the water production collecting pipe (7011) comprises a main pipe (7011a) communicated with the water production pipe (701), and a plurality of branch pipes (7011b) which are detachably connected with the main pipe (7011a) and are arranged in parallel with each other.

8. The digester as claimed in claim 7, wherein a plurality of the branch pipes (7011b) arranged in parallel with each other are arranged along a radial direction of the digester, and each of the branch pipes (7011b) has a length fitting to an inner wall of the digester;

the branch pipe (7011b) is made of a stainless steel filter screen, and the mesh of the filter screen is 500-1000.

9. The decolorizing tank of claim 8, wherein said tank body (1) is provided with a grid mesh (13) at an end portion close to said tank cover (2), said grid mesh (13) being connected to said baffle (501), and said grid mesh (13), said baffle (501) and said tank cover (2) together constitute a cavity for accommodating said produced water collecting pipe (7011).

10. The bleaching tank according to claim 3, characterized in that the backwashing mechanism (10) comprises a backwash pipe (1001), a connection pipe (1002) communicating with the backwash pipe (1001) and having two pipes communicating with two spaces in the bleaching tank divided by the partition (5), respectively, correspondingly, and a fourth branch pipe (1003) communicating with the backwash pipe (1001) for produced water sampling;

valves for opening and closing the pipelines are arranged on the two pipelines of the connecting pipe (1002) and the fourth branch pipe (1003).

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