KR101879740B1 - Advanced water-treating apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an advanced water treatment apparatus for wastewater, and more particularly, to an advanced water treatment apparatus for wastewater treatment capable of enhancing treatment effects of organic matter, nitrogen, and phosphorus in wastewater by repeatedly providing an anoxic tank and an oxic tank at the downstream of an anaerobic tank.
The apparatus for treating wastewater according to the present invention comprises an anaerobic tank for removing phosphorus in incoming water to be treated, a primary anoxic tank for removing nitrate nitrogen from the treated water flowing from the anaerobic tank, A primary aerobic tank for aerating the air to the inside of the primary aerobic tank, a primary aerobic tank for aerating the air into the primary aerobic tank, a primary aerobic unit for aerating the inside of the primary aerobic tank, and a nitrification tank for removing nitrogenous nitrogen remaining in the water to be treated, A secondary anoxic tank for intermittently aeration of air into the water to be treated flowing from the secondary anoxic tank, a separation membrane for separating water and sludge installed in the secondary anoxic tank, A secondary aeration means, and an inner carry portion for carrying the activated sludge from the primary aerobic tank to the primary anoxic tank.

Description

{Advanced water-treating apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an advanced water treatment apparatus for wastewater, and more particularly, to an advanced water treatment apparatus for wastewater treatment capable of enhancing treatment effects of organic matter, nitrogen and phosphorus in wastewater by repeatedly providing an anoxic tank and an oxic tank at the downstream of an anaerobic tank.

Advanced water treatment refers to an improved water treatment method that simultaneously removes not only organic matter but also nitrogen and phosphorus from bottom and wastewater containing nitrogen and phosphorus. The removal of nitrogen is carried out through a nitrification process for converting nitrogen compounds in wastewater into nitrate nitrogen in an aerobic atmosphere and a denitrification process for reducing nitrate nitrogen to nitrogen gas under anaerobic atmosphere. Releasing phosphorus by metabolic activity of microorganisms, allowing the microorganisms in the aerobic state to consume excess phosphorus, and then removing the phosphorus with sludge.

Recently, water quality standards are being strengthened as a measure to improve water quality in public water bodies that are rapidly polluted. In order to improve water quality in the final discharge water, it is very important to remove not only organic substances but also nutrients (nitrogen, phosphorus, etc.).

In particular, nitrogen and phosphorus compounds in water are pollutants themselves, which cause loss of water value, but they are used as nutrients necessary for algal growth and cause deterioration of water quality.

In this way, adequate removal of nitrogen and phosphorus which cause eutrophication of lake and coastal waters is desperately needed. However, in case of small and medium scale treatment facilities, the sewage month time is very short compared with large scale treatment plants, It is difficult to remove nitrogen and phosphorus together. However, it is often necessary to maintain a high level of discharge water quality. However, in the case of conventional small-scale wastewater treatment plants, most of them focus on removing organic substances and suspended substances. Nitrogen and phosphorus nutrients are rarely treated.

MBR (membrane bioreactor) process is a technology to purify wastewater by applying a membrane with fine pore size. In this process, it is possible to completely remove particulate pollutants at the level of micro or less, By preventing the loss of microorganisms necessary for the purification of pollutants, the biological treatment capacity is maximized and the processing speed is 2.5 to 3 times faster than that of the general process. In addition, it can be applied to a biological wastewater treatment system which can be applied without major changes in the existing biological wastewater treatment process, and is easy to operate and easy to operate.

Particularly, since the quality of treated water can be adjusted according to the selection of the membrane, it is used in a small scale heavy water facility in accordance with the policy consideration for the recent water reuse.

The wastewater advanced treatment system using the membrane bioreactor process is known to be disadvantageous in terms of removal of phosphorus because the amount of surplus sludge generated is much smaller than that of the conventional method and this is accepted as an advantage of the MBR system. Therefore, there is a need for an MBR system for simultaneous removal of nitrogen and phosphorus, which overcomes the weaknesses in the phosphorus removal aspect.

Korean Patent No. 10-1019092: High water treatment apparatus and method for wastewater for phosphorus removal

The object of the present invention is to provide an apparatus for treating wastewater, which is capable of increasing the effect of treating organic matter, nitrogen, and phosphorus in wastewater, by providing an anoxic tank and an oxic tank repeatedly at the downstream end of the anaerobic tank. have.

According to an aspect of the present invention, there is provided an apparatus for treating wastewater, comprising: an anaerobic tank for removing phosphorus in incoming water; A primary anoxic tank for removing nitrate nitrogen in the water to be treated flowing from the anaerobic tank; A primary anoxic tank for nitrifying nitrogen by aerating the air into the water to be treated flowing from the primary anoxic tank; A primary aeration means for aerating the inside of the primary oxic tank; A secondary anoxic tank for removing nitrate nitrogen remaining in the water to be treated flowing from the primary oxic tank; A secondary aerobic tank for intermittently aerating air into the water to be treated flowing from the secondary anoxic tank; A separation membrane installed in the secondary oxic tank to separate water and sludge; A secondary aeration means for aerating the air to the secondary oxic tank; And an inner conveyor for conveying the activated sludge from the primary oxic tank to the primary anoxic tank.

And an influent intermittent supply unit for intermittently supplying the water to be treated to the anaerobic tank to the secondary anoxic tank.

The primary aeration means includes an air diffuser installed in the primary aerobic tank, a blower for supplying air to the diffuser, and an air supply line for connecting the blower and the diffuser.

Wherein the primary aeration means comprises an outflow line connected to the primary oxic tank, a circulation pump installed in the outflow line for circulating a part of the water to be treated in the primary oxic tank, A re-inflow line connected to the on-off valve and extending to the inside of the primary oxic tank, and a connection line connected to the re-inflow line, And an air supply line connected to the open / close valve, and a blower connected to the air supply line to inject air into the water to be treated passing through the open / close valve when the open / close valve is opened.

Wherein an opening of the flow path is connected to the connection line, an outlet of the flow path is connected to the re-inflow line, and the air supply line is connected to the inlet side of the flow path A first tapered portion formed on an inner circumferential surface of the housing and formed so as to increase the diameter of the flow path toward the rear; a first tapered portion extending from a rear end of the first tapered portion and formed on an inner circumferential surface of the housing, A plurality of teeth formed on the second tapered portion to form a fine vortex in the fluid passing through the second tapered portion, and a plurality of teeth provided inside the housing, And the outer circumferential surface is in close contact with the first tapered portion, A support body having an insertion groove for receiving a rear end of the connection rod, the support body being disposed inside the housing, A flange formed on an outer circumferential surface of the support body for alternately expanding and contracting an outer diameter of the support body; a flange screwed to a rear end of the housing; And a support bar connecting the flange and the support body to support the support body such that the support body is positioned at the center of the flow path.

As described above, the present invention combines a biological process with a separation membrane process to treat organic matter, nitrogen, and phosphorus through a biological process, enhance the removal of suspended matters through the separation membrane process, and ensure a high quality water.

In addition, the present invention can improve the treating effect of organic matter, nitrogen, and phosphorus in the wastewater by repeatedly providing the anoxic tank and the oxic tank at the downstream of the anaerobic tank.

In addition, the present invention can increase the oxygen transfer efficiency by aeration of air into the aerobic tank in the form of minute bubbles, thereby reducing the amount of bubbles and saving energy.

1 is a block diagram of an apparatus for water treatment of wastewater according to an embodiment of the present invention,
FIG. 2 is a schematic view showing the configuration of the advanced water treatment apparatus of the wastewater shown in FIG. 1,
FIG. 3 is a schematic view showing a configuration of a wastewater treatment apparatus according to another embodiment of the present invention,
FIG. 4 is a cross-sectional view illustrating a recessed portion applied to FIG. 3,
5 is a sectional view showing the operation of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for treating wastewater according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, an apparatus for water treatment of wastewater according to an embodiment of the present invention includes an anaerobic tank 10 for removing phosphorus in incoming water to be treated, A primary anoxic tank 20 for removing acidic nitrogen, a primary oxic tank 30 for nitrifying nitrogen by aerating the air into water to be treated from the primary anoxic tank 20, A secondary anoxic tank 40 for removing the nitrate nitrogen remaining in the water to be treated flowing from the primary oxic tank 30 and a secondary anoxic tank 40 for introducing air from the secondary anoxic tank 40 A separation membrane 55 installed in the second oxic tank 50 for separating water and sludge and a second separation vessel 55 for separating the water and the sludge from the second oxic tank 50. In the second oxic tank 50, A second aeration means for making a first aerobic tank 30, Provided with internal transport section for transporting the activated sludge in the anoxic tank 20.

The sewage or wastewater to be treated is not shown but may be introduced into the flow control tank 1 through a pretreatment device, such as a screen or a needle bed. The flow rate adjusting tank 1 serves to uniformly control the inflow amount of the water to be treated and the pollution load.

A pump 3 is installed inside the flow rate adjusting tank 1 to introduce the water to be treated into the anaerobic tank 10. The pump 3 introduces the water to be treated of the flow rate control tank 1 into the anaerobic tank 10 through the connection line 5.

The anaerobic tank 10 is provided at the downstream end of the flow rate adjusting tank 1, that is, at the upstream side of the biological process, and removes phosphorus in the water to be treated flowing from the flow rate adjusting tank 1.

The anaerobic tank 10 releases phosphorus by 3 to 4 times the influent concentration using microorganisms. The anaerobic tank 10 is provided with a driving motor (not shown) as an agitating device for uniform distribution and an impeller 11 connected to the driving motor.

The primary anoxic tank 20 is disposed downstream of the anaerobic tank 10 to remove nitrate nitrogen from the treated water flowing from the anaerobic tank 10. The treatment target water flows into the primary anoxic tank 20 through an outflow hole (not shown) provided in an upper portion of the partition wall 13 formed between the anaerobic tank 10 and the primary anoxic tank 20.

The primary anoxic tank (20) is provided with an agitator for even distribution. The stirring device is composed of a driving motor (not shown) provided on the upper portion of the primary anoxic tank 20 and an impeller 21 connected to the driving motor.

The primary anoxic tank 20 is operated under an anaerobic condition in which the oxygen concentration is extremely low, so that the nitrate nitrogen in the treatment water flowing from the anaerobic tank 10 is changed into nitrogen gas and released into the atmosphere to be removed. Such a denitrification reaction may be performed by denitrifying microorganisms such as Pseudomonas, Micrococcus, Bacillus, and the like.

The primary aerobic tank 30 is provided at the downstream of the primary anoxic tank 20 to aerate the nitrogen into the water to be treated flowing from the primary anoxic tank 20 to nitrify the nitrogen. At the same time, organic matter is removed and excess phosphorus is ingested.

The treatment target water flows into the primary aerobic tank 30 through an outflow hole (not shown) provided in an upper portion of the partition wall 23 formed between the primary anoxic tank 20 and the primary aerobic tank 30.

The primary aerobic tank 30 is provided with primary aeration means for aerating the inside of the primary aerobic tank 30.

The primary aeration means includes an air diffuser 60 installed inside the primary aerobic tank 30, a blower 61 for supplying air to the aeration diffuser 60, a blower 61 and a diffuser 60 And an air supply line 62 for connection. The air supply line 62 is provided with a valve 63.

The inner carry section carries the activated sludge to the primary anoxic tank (20) in the primary aerobic tank (30). To this end, the internal return section includes an internal conveyance pipe 33 connecting the primary anoxic tank 30 and the primary anoxic tank 20, and a part of the activated sludge of the primary oxic tank 30 connected to the internal return pipe 33 And a pump 31 for pumping it to the primary anoxic tank 20.

The appropriate concentration of the microorganisms necessary for the primary anoxic tank 20 can be maintained by the inner carry section.

The second anoxic tank (40) is disposed downstream of the primary oxic tank (30) to remove nitrate nitrogen remaining in the water to be treated flowing from the primary oxic tank (30). The treatment target water flows into the secondary anoxic tank 40 through an outflow hole (not shown) provided on the upper part of the partition wall 35 formed between the primary aerobic tank 30 and the secondary anoxic tank 40.

The secondary anoxic tank (40) is provided with a stirring device for even distribution. The stirring apparatus includes a driving motor (not shown) provided on the upper portion of the secondary anoxic tank 40 and an impeller 41 connected to the driving motor.

The denitrification reaction is again caused by the endogenous respiration of the microorganisms in the second anoxic tank 40, and the untreated nitrate nitrogen is further removed, thereby improving the removal efficiency.

An inflow water intermittent supply unit may be further provided for securing a nutrient source of microorganisms in the secondary anoxic tank 40. [ The inflow water intermittent supply part intermittently supplies a part of the water to be treated, which flows into the anaerobic tank (10), to the secondary anoxic tank (40).

The inflow water intermittent supply section includes a branch line 7 branched from the connection line 5 and extending to the secondary anoxic tank 40 and a valve 9 provided in the branch line 7. The valve 9 intermittently opens the branch line 7 so that the object to be treated can flow into the secondary anoxic tank 40 intermittently. The valve 9 can be operated automatically or manually.

The second aerobic tank (50) is installed at the downstream of the secondary anoxic tank (40) to intermittently aerate the air into the water to be treated flowing from the secondary anoxic tank (40). The treatment target water flows into the secondary oxic tank 50 through an outflow hole (not shown) provided in the upper part of the partition wall 43 formed between the secondary anoxic tank 40 and the secondary oxic tank 50.

The secondary aerobic tank 50 is intermittently aerated to prevent the bulking and rising of the activated sludge under anaerobic and aerobic conditions and to prevent re-emission of phosphorus.

When the second aeration tank 50 is operated under an aeration condition, that is, in an exhalation state, excessive intake of phosphorus by microorganisms and oxidation in which ammonia nitrogen is converted to nitrate nitrogen occurs, and when operated in an anoxic condition, Nitrogen is converted into nitrogen gas by microorganisms related to digestion and nitrogen is removed. By repeating the aeration condition and the non-aeration condition alternately by this method, it is possible to effectively remove nitrogen and phosphorus by inducing excessive intake of phosphorus and nitrification and denitrification.

Air is intermittently aerated to the secondary oxic tank 50 by the secondary aeration means.

The secondary aeration means includes an air diffuser 65 installed inside the secondary aerobic tank 50, a blower 67 for supplying air to the diffuser 65, a blower 67 and an air diffuser 65 A connecting air supply line 68 and a timer (not shown) for periodically activating the blower 67. A valve 69 is provided in the air supply line 68.

A separation membrane 55 is installed in the second oxic tank 50 to remove residual organic matter and to separate solid-liquid separation of water and sludge.

It is preferable that the separation membrane 55 is an immersion membrane. The water separated from the sludge through the separation membrane 55, that is, treated water, is discharged to the outside through the discharge pipe 57.

As described above, the present invention can treat organic matter, nitrogen, and phosphorus through a biological process by combining a biological process and a separation membrane process, enhance the removal of suspended matters through a separation membrane process, and ensure a high quality water.

In addition, the present invention can improve the treating effect of organic matter, nitrogen, and phosphorus in the wastewater by repeatedly providing the anoxic tank and the oxic tank at the downstream of the anaerobic tank.

3 to 5 show an apparatus for water treatment of wastewater according to another embodiment of the present invention.

3 to 5, except for the primary aeration means, the remaining configuration is the same as that of the embodiment of Fig. 1 described above, and therefore only the primary aeration means will be described below.

The illustrated primary aeration means can supply air to the primary aerobic tank 30 in the form of micro-bubbles, thereby increasing the oxygen transfer efficiency, reducing the amount of aeration and saving energy.

The primary aeration means includes an outflow line 70 connected to the primary aerobic tank 30 and a circulation pump 73 installed in the outflow line 70 for circulating a part of the water to be treated in the primary aerobic tank 30, A connection line 75 connected to the circulation pump 73, an on-off valve 80 connected to the connection line 75, and an on-off valve 80 connected to the on- An air diffuser line 76 connected to the air inlet line 76 and an air diffuser line 77 connected to the air inlet line 76 to be installed in the primary air source vessel 30 and an air supply line 79 connected to the on- , And a blower (78) connected to the air supply line (79) for injecting air into the water to be treated passing through the open / close valve (80).

The pump 73 pumps a part of the water to be treated inside the primary oxic tank 30 through the outflow line 70. The treatment object water pumped through the pump 73 sequentially passes through the connection line 75, the on-off valve 80 and the re-inflow line 76 and then flows through the air diffuser 77 to the primary aerobic tank 30 And then flows in again.

When the blower 78 operates, air is injected into the opening / closing valve 80 through the air supply line 79 and mixed with the water to be treated passing through the opening / closing valve 80.

The opening / closing valve 80 applied to the present invention plays a role of opening / closing the flow passage through which the water to be treated flows, and at the same time, generating the air mixed into the water to be treated as fine bubbles.

The opening and closing valve 80 includes a housing 81 having a passage 82 through which water to be treated passes and a first tapered portion 82 formed on the inner peripheral surface of the housing 81, A second tapered portion 84 extending from the rear end of the first tapered portion 83 and formed on the inner circumferential surface of the housing 81 so as to reduce the diameter of the flow path 82 toward the rear side, A plurality of teeth 85 formed on the second tapered portion to form a fine vortex in the fluid passing through the second tapered portion, a moving head portion 87 provided inside the housing 81, A supporting body 91 which is installed inside the housing 81 and into which the rear end of the connecting rod 90 is inserted and a supporting body 91 which is installed in the supporting body 91 An elastic member 97 for urging the connecting rod 90 forward, and an elastic member 97 for alternately expanding and contracting the outer diameter of the supporting body 91 A flange 105 screwed on the rear end of the housing 81 and a support bar 107 connecting the flange 105 and the support body 91 to each other. .

In the housing 81, a flow passage 82 through which water to be treated passes is formed. The front end of the housing 81 is coupled to the connecting line 75 so that the inlet of the flow path 82 of the housing 81 is connected to the connecting line 75. Since the rear end of the housing 81 is coupled with the re-inflow line 76, the outlet of the flow path 82 of the housing 81 is connected to the re-inflow line 76. The flange 101 formed at the rear end of the connecting line 75 and the flange 100 formed at the front end of the housing 81 are coupled by bolts and nuts. The flange 105 coupled to the rear end of the housing 81 and the flange 109 formed at the front end of the re-inflow line 76 are coupled by bolts and nuts.

An air supply line 79 is connected to the inlet side of the flow passage 82. The air supply line 79 extends from the outside of the housing 81 to the inside, and an end thereof is exposed on the flow path 82.

The first tapered portion 83 and the second tapered portion 84 are formed on the inner peripheral surface of the housing 81.

The first tapered portion 83 is formed so that the diameter of the flow path increases toward the rear of the housing 81. The second tapered portion 84 extends from the rear end of the first tapered portion 83. The second tapered portion 84 is formed so that the diameter of the flow path 82 decreases toward the rear of the housing 81.

The second tapered portion 84 has a plurality of teeth 85 formed thereon. By the teeth 85, fine vortices can be formed in the fluid passing through the second tapered portion 84. When the water to be treated passes through the second tapered portion 84 whose flow path is narrowed, the speed becomes faster and the pressure becomes lower. At the same time, since fine vortices are generated by the teeth 85 in a large number of times, the efficiency of contact between the water to be treated and the air is increased, and large bubbles are finely split to form minute bubbles.

The moving head 87 is installed inside the housing 81. The moving head 87 is formed to have a larger diameter toward the rear. The outer peripheral surface of the moving head portion 87 is in close contact with the first tapered portion 83. Since the moving head 87 blocks the flow path, when the object water flows into the inlet of the flow path 82, the moving head 87 receives pressure from the object water. At this time, the moving head 87 is retracted as shown in Fig. When the moving head 87 is retracted, a gap is formed between the outer circumferential surface of the moving head 87 and the first tapered portion 83, so that the processing target water can move backward through the gap.

A concave impact groove 89 is formed in the front surface of the moving head 87 to enlarge the contact area with the water to be treated.

The connecting rod 90 is engaged with the rear surface of the moving head 87 and extends a certain length rearward.

The support body 91 is installed inside the housing 81 so as to support the connection rod 90 so as to move back and forth. An insertion groove (95) is formed in the support body (91). The rear end of the connecting rod 90 is inserted into the insertion groove 95 of the supporting body 91.

The elastic member 97 is provided in the insertion groove 95. As the elastic member 97, a spring can be used. One side of the elastic member 97 contacts the rear end of the connecting rod 90 and presses the connecting rod 90 forward. If the water to be treated does not flow into the inlet of the housing 81, the moving head 87 moves forward by the elastic force of the elastic member 97 to block the oil passage 82 as shown in FIG.

The corrugated portion 93 is formed on the outer peripheral surface of the support body 91. The corrugated portion 93 serves to expand and contract the outer diameter of the support body 91 alternately. The corrugated portion 93 can change the cross-sectional area of the flow passage alternately to greatly change the flow of the fluid passing around the support body 91, thereby greatly increasing the gas-liquid contact efficiency.

A flange 105 is screwed to the rear end of the housing 81. A threaded portion 106 is formed on the front surface of the flange 105 and is coupled to the housing 81.

The support bar 107 connects the flange 105 and the support body 91. The support bar 107 supports the support body 91 such that the support body 91 is positioned at the center of the flow path 82. At least two support bars 107 are arranged at a constant angle to support the support body 91.

By the above-described first aeration means, the present invention can aerate the air in the form of minute bubbles into the primary aeration tank, thereby increasing the oxygen delivery efficiency, reducing the amount of breeze and saving energy. Although not shown, the second aeration means can also have the same configuration as the first aeration means shown.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation.

1: Flow control tank 10: Anaerobic tank
20: Primary anoxic tank 30: Primary aerobic tank
40: Secondary anoxic tank 50: Secondary aerobic tank
55: membrane

Claims (5)

An anaerobic tank for removing phosphorus in the incoming water to be treated;
A primary anoxic tank for removing nitrate nitrogen in the water to be treated flowing from the anaerobic tank;
A primary anoxic tank for nitrifying nitrogen by aerating the air into the water to be treated flowing from the primary anoxic tank;
A primary aeration means for aerating the inside of the primary oxic tank;
A secondary anoxic tank for removing nitrate nitrogen remaining in the water to be treated flowing from the primary oxic tank;
A secondary aerobic tank for intermittently aerating air into the water to be treated flowing from the secondary anoxic tank;
A separation membrane installed in the secondary oxic tank to separate water and sludge;
A secondary aeration means for aerating the air to the secondary oxic tank;
And an inner conveyor for conveying the activated sludge from the primary oxic tank to the primary anoxic tank,
The primary aeration means includes an outflow line connected to the primary oxic tank, a circulation pump installed in the outflow line and circulating a part of the water to be treated in the primary oxic tank, a connection line connected to the circulation pump, An open / close valve connected to the connection line, a re-inflow line connected to the on / off valve and extending into the first oxic tank, an air diffusing pipe connected to the re-inflow line and installed in the first oxic tank, And an air supply line connected to the on / off valve, and a blower connected to the air supply line for injecting air into the water to be treated passing through the on / off valve when the on / off valve is opened,
Wherein an opening of the flow path is connected to the connection line, an outlet of the flow path is connected to the re-inflow line, and the air supply line is connected to the inlet side of the flow path A first tapered portion formed on an inner circumferential surface of the housing and formed so as to increase the diameter of the passage as it goes backward; and a second tapered portion extending from a rear end of the first tapered portion and formed on an inner circumferential surface of the housing, A plurality of teeth formed on the second tapered portion to form a fine vortex in the fluid passing through the second tapered portion, and a plurality of teeth provided inside the housing, And the outer circumferential surface is in close contact with the first tapered portion, A support body having an insertion groove for receiving a rear end of the connection rod, the support body being disposed inside the housing, A flange formed on an outer circumferential surface of the support body for alternately expanding and contracting an outer diameter of the support body; a flange screwed to a rear end of the housing; And a support bar connecting the flange and the support body to support the support body such that the support body is positioned at the center of the flow path. The apparatus according to claim 1, further comprising: an influent intermittent supply unit for intermittently supplying water to be treated to the anaerobic tank to the secondary anoxic tank. The air conditioner according to claim 1, wherein the primary aeration means includes an aeration engine installed in the primary ancraft vessel, a blower for supplying air to the aeration engine, and an air supply line for connecting the blower and the aeration engine Wherein the water treatment system comprises: delete delete

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