KR102276708B1 - Sewage treatment facility that can separate and treat struvite stones - Google Patents

Abstract

The present invention relates to a sewage treatment facility which crystallizes and separates magnesium, ammonium, and phosphorus materials in order to remove excessively resulting phosphorus from the sewage treatment facility, thereby prolonging a life of pipes and equipment, reducing maintenance costs, and separating stones that can be used as fertilizer from the produced stones. To that end, the sewage treatment facility capable of separating and treating stones comprises: a treatment tank which treats the introduced sewage to be purified; a sedimentation tank provided together with the treatment tank to precipitate and separate sediment from sewage; an anaerobic tank provided at the back of the treatment tank and sedimentation tank to reduce a concentration of pollutants by contacting living sewage with anaerobic bacteria that decompose high-concentration organic matters under anoxic conditions; a dehydrator that separates pollutants by centrifuging sewage with reduced pollutants in the anaerobic tank; and a generator that crystallizes and separates magnesium, ammonium, and phosphorus substances from sewage through a reaction and a pH concentration control by the contact between supernatant water and desorption filtrate as the supernatant water is introduced from the anaerobic tank and the dehydrator and the desorption filtrate is introduced from the dehydrator.

Description

Sewage treatment facility that can separate and treat struvite stones

In the present invention, in order to remove struvite stones (massium, ammonium, phosphorus stones) generated in the sewage treatment process, magnesium, ammonium, and phosphorus materials are calcified and separated to form pipes, concentrators, dehydrators, etc. in the subsequent treatment process It is related to a sewage treatment facility that can separate and treat the stones that can be used as fertilizers, along with reducing the scale to be formed, extending the life of pipes and equipment, and reducing maintenance costs.

In general, a sewage treatment plant is a facility for minimizing environmental pollution by purifying and discharging domestic sewage or industrial sewage and industrial water.

Such a sewage treatment plant can treat sewage using various methods such as filter filtration and microbial filtration, and various technologies for efficient treatment are used.

In the case of treating sewage sludge in an anaerobic digester during this sewage treatment process, a failure occurs in the pump due to the generation of scale in the form of struvite in the pump that transports the digested sludge, and as such scale is formed in the pipe, the pipe is clogged Problems may occur, and the occurrence of failure due to stones in the dehydrator, concentrator, etc. may also cause a problem of reduced durability.

In relation to this, in Prior Document 1 (Patent Publication No. 10-2009-0055160 Sewage Treatment System Using a Flow Rate Control Tank as a Bioreactor and Method Thereof), a reaction tank capable of treating at least one of nitrogen or phosphorus by using the flow rate control tank as a bioreactor tank The configuration is disclosed.

However, Prior Document 1 does not disclose a configuration that can solve a pump failure or clogging of a pipe due to sludge generation, so that the pump or pipe is clogged by the sludge, making maintenance difficult, and durability is reduced.

Prior Document 1 (Patent Publication No. 10-2009-0055160 Sewage treatment system and method using flow control tank as bioreactor)

The present invention has been devised to solve the above problems, and the symbol water generated in the anaerobic tank and the desorption filtrate generated in the dehydrator are introduced into the generator, and the introduced symbol water and the desorption filtrate are stirred and reacted with magnesium, ammonium and As the phosphorus material is crystallized, the crystallized struvite stones (magnesium, ammonium, phosphorus stones) are precipitated and discharged, and only the upper layer water from which magnesium, ammonium and phosphorus have been removed can be discharged. An object of the present invention is to provide a sewage treatment facility that can separate and treat stones that can be used as phosphorus fertilizer by crystallizing, ammonium, and phosphorus and separately discharged, or can be disposed of by landfill without pollution.

The sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention for solving the above problems includes a treatment tank 100 that treats sewage to be purified when it flows in, the treatment tank 100 and The settling tank 200, which is provided together to precipitate sediment from the sewage, and is provided at the back of the treatment tank 100 and the settling tank 200 to decompose high-concentration organic matter under anaerobic conditions by contacting domestic sewage with anaerobic bacteria to contaminants The anaerobic tank 300 for reducing the concentration of the anaerobic tank 300, the dehydrator 400 for separating the pollutants by centrifuging the sewage from which the pollutants have been reduced in the anaerobic tank 300, and the anaerobic tank 300. Symbol water is introduced from the dehydrator ( 400), the desorption filtrate is introduced, and a generator 500 for crystallizing and separating magnesium, ammonium, and phosphorus substances from the sewage through a reaction by contact of the symbol water and the desorption filtrate and adjustment of the pH concentration.

Here, the generator 500 is connected to the receiving part 510 in which the symbol water and the desorption filtrate are introduced and accommodated, and the anaerobic tank 300 is connected to the receiving part 510 to introduce the symbol water in the anaerobic tank 300 . The symbol water inlet pipe 520, which is connected to the receiving part 510 from the dehydrator 400, and introduced into the desorption filtrate inlet pipe 530 and the receiving part 510 for introducing the desorption filtrate in the dehydrator 400 It is characterized in that it includes a stirring unit 540 for stirring the symbol water and the desorption filtrate.

At this time, the upper water discharge unit 550 provided at the uppermost portion of the receiving unit 510 to discharge the upper layer water generated in the upper layer where magnesium, ammonium and phosphorus are separated and precipitated in a crystalline state, and the receiving unit 510 . The stone discharge pipe 560 provided at the bottom of the to discharge the precipitated stones and the stones generated from the symbol water and the desorption filtrate provided in the lower part of the receiving unit 510 and stirred by the stirring unit 540 are introduced. It is characterized in that it includes a stone sieve 570 that separates the stones so that the large stones are continuously stirred by passing the small stones while preventing them from ascending again to the top.

The sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention has the following effects.

First, there is an effect of generating and removing magnesium, ammonium, and phosphorus in the form of crystals by stirring and reacting the symbol water and the desorption filtrate in the sewage treatment facility.

Second, magnesium, ammonium, and phosphorus produced in the form of crystals are separately discharged and used as fertilizer.

Third, in a state in which magnesium, ammonium, and phosphorus are removed in a crystalline state, the upper layer water has the effect of being separately discharged.

1 is a schematic view of a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention;
2 is a cross-sectional perspective view showing in detail the configuration of a generator in a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention;
3 is a cross-sectional perspective view showing a state in which a stone induction unit is further provided in the generator in a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention;

The present invention relates to a sewage treatment facility. In particular, in order to remove magnesium, ammonium, and phosphorus from a sewage treatment facility, symbol water and treated water such as a desorption filtrate are reacted to crystallize and precipitate magnesium, ammonium, and phosphorus to separate magnesium. It is characterized in that only the upper layer water from which ammonium and phosphorus are separated can be discharged and treated.

Hereinafter, a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention.

Referring to Figure 1, the present invention relates to a sewage treatment facility, which is provided with a treatment tank 100 that treats sewage inflow to be purified, and the treatment tank 100, to precipitate and separate sediment from the sewage. 200, an anaerobic tank provided at the back of the treatment tank 100 and the settling tank 200 to reduce the concentration of pollutants by contacting domestic sewage with anaerobic bacteria that decompose high-concentration organic matter under anoxic conditions 300, the anaerobic tank Symbol water is introduced from the dehydrator 400 and the anaerobic tank 300 to separate pollutants by centrifuging the sewage with reduced contaminants in 300, and the desorption filtrate is introduced from the dehydrator 400 to desorb symbol water and desorption It is configured to include a generator 500 that crystallizes and separates magnesium, ammonium and phosphorus substances from sewage through the reaction by contact of the filtrate and pH concentration adjustment.

This makes it possible to effectively remove magnesium, ammonium and phosphorus from the sewage and discharge it.

Figure 2 is a cross-sectional perspective view in detail showing the configuration of a generator in a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention.

Referring to FIG. 2 , the generator 500 is connected to the receiving unit 510 in which the symbol water and the desorption filtrate are introduced and accommodated, and the anaerobic tank 300 is connected to the receiving unit 510 in the anaerobic tank 300 . The symbol water inlet pipe 520 for introducing the symbol water, the desorption filtrate inlet pipe 530 connected to the receiving part 510 from the dehydrator 400 to introduce the desorption filtrate from the dehydrator 400, and the receiving part ( It is configured to include a stirring unit 540 for stirring the symbol water and the desorption filtrate introduced into the 510).

Here, the accommodating part 510 is provided in the lower part of the upper layer water separator 511 and the upper layer water separator 511 that separates only the upper layer water where stones are precipitated and does not contain stones during the stirring process, and in the receiving part It is configured to include a stone filtering member 512 to prevent the stirred stones from flowing into the upper water separator 511 side.

The stone filtering member 512 is to prevent the stones from floating in the stirring process and flowing into the upper water separator 511 side, and the stones introduced into the upper water separator 511 are removed during the upper water discharge process. It includes a sedimentation inducing part 512a for inducing and separating the lower part, and a floating prevention part 512b provided just below the sedimentation inducing part 512a to prevent the floating stones from flowing into the upper water separating part 511. is composed by

At this time, the settling induction unit 512a is provided with a plurality of plates inclined in the opposite direction to the direction in which the upper water is discharged from the upper water separation unit 511, so that the stones introduced in the upper water discharge process are guided downward by the inclined surface. separate

And the floating prevention part (512b) is made of a plurality of plates inclined in the opposite direction to the sedimentation induction part (512a) to prevent the stones from flowing into the upper water separation part (511), while some of the introduced stones are settling induction part (512a) is guided back down by the slope of

Meanwhile, the accommodating part 510 is further provided with a pH adjusting part 513 capable of adjusting the pH concentration of the sewage stirred inside the accommodating part.

The pH adjusting unit 513 includes a drug storage tank 513a in which a drug capable of adjusting the pH is stored, and a drug inflow that selectively introduces the drug contained in the drug storage tank 513a into the accommodating part 510 . It is configured to include a drug inlet pump (513c) for controlling the drug to be introduced from the drug storage tank (513a) through the pipe (513b) and the drug inlet pipe (513b).

This prevents the stones from floating and flowing into the upper water separation unit 511, and the inflowing stones are also guided to the lower part during the upper water discharge process, so that they can be separated from the upper water.

The symbol water inlet pipe 520 is connected to the receiving part 510 so that the symbol water is introduced from the anaerobic tank 300 , and the symbol water generated in the anaerobic tank 300 is introduced into the receiving part 510 .

And the desorption filtrate inlet pipe 530 introduces the desorption filtrate from the dehydrator 400 by the distribution inlet pipe 531 provided in a circular shape along the inner circumference of the stirring guide pipe 541 of the stirring unit 540 to be described later. In, it is possible to introduce the stirred sewage flow so as to spread evenly to the outside.

At this time, the distribution inlet pipe 531 is provided with a plurality of inlet at regular intervals and an inlet hole 531a for introducing the desorption filtrate downward is formed.

Meanwhile, a sand inlet pipe 532 capable of introducing sand serving as a crystallization nucleus for crystallization of magnesium, ammonium, and phosphorus is connected to the distribution inlet pipe 531 .

The sand inlet pipe 532 introduces fine sand into the distribution inlet pipe 531, and the desorption filtrate and sand are introduced into the agitator 540 together. At this time, the introduced sand acts as a nucleus and magnesium, ammonium, phosphorus can be crystallized.

The stirring unit 540 is provided in the form of a tube in the central portion of the receiving unit 510 to introduce a symbol water and desorption filtrate to the inside to induce the first stirring, and the stirring induction pipe 541. ) provided in the center of the stirring screw 542 for inducing and stirring the symbol water and the desorption filtrate introduced by rotation to the lower part, and provided on the outer side of the upper part of the receiving part 510 to rotate the stirring screw 542 A stirring motor 543 that provides a, and a drive shaft 544 extending from the stirring motor 543 to the stirring screw 542 side and transmitting the power of the stirring motor 543 to the stirring screw 542 to rotate do.

At this time, the stirring guide tube 541 is provided concentrically spaced apart from the inner surface of the receiving part 510 by a predetermined distance, and this stirring guide tube 541 is provided with the inner surface of the receiving part 510 and the stirring guide tube ( It is provided between the outer surfaces of the 541 and is supported by the stirring guide tube support plate 541a for fixing and supporting the stirring guide tube 541 in the center of the receiving part 510 .

The stirring guide tube support plate 541a forms a space between the outer surface of the stirring guide tube 541 and the inner surface of the receiving part 510, and the stirring guide tube 541 starts stirring symbol water and desorption filtrate. It is possible to circulate in a vortex form from the center to the outside and stir.

As a result, the symbol water and the desorption filtrate are introduced and the pH is adjusted while stirring, so that magnesium, ammonium, and phosphorus are precipitated and separated.

And in the accommodating part 510, while being stirred by the stirring part 540, magnesium, ammonium, and phosphorus crystallized and precipitated in a state in which the upper layer water discharge unit for discharging the upper layer water generated in the upper layer of the accommodating part 510 ( 550), a stone discharge pipe 560 provided in the lower portion of the receiving unit 510 and discharging precipitated magnesium, ammonium, and phosphorus stones, and a stone discharge pipe 560 provided in the lower portion of the receiving unit 510 and stirred by the stirring unit 540 When the stones generated from the symbol water and the desorption filtrate are introduced, the large stones are prevented from ascending to the upper part, while the small stones are passed through and stirred continuously, allowing the stones to circulate and separating the stones larger than a certain size from circulation. It is configured to include a stone sieve 570.

Here, the upper water discharge unit 550 includes an upper water induction unit 551 provided in the upper water separation unit 511 to guide upper water to one side, and an upper layer provided outside the receiving unit 510 and discharged. It is configured to include an upper water collecting part 552 that collects water and an upper water discharge pipe 553 provided to extend below the upper water collecting part 552 to discharge the collected upper water.

At this time, the upper water induction unit 551 is provided in the upper water separation unit 511 to introduce the upper water from the upper water separation unit 511 to the upper water collecting unit 552 , a guide pipe 551a for guiding it to be discharged toward the upper water collecting unit 552 . ), a circulation pump 551b installed in the induction pipe 551a to circulate the upper water in the upper part of the receiving part 510, and an upper water collecting part 552 that flows in and circulates in the induction pipe 551a. ) by discharging to the side and configured to include a discharge hole 551c for discharging the flow of the upper water to be guided to the upper water collecting part 552 side.

And the stone sieve 570 is formed through the center with the same diameter as the diameter of the stirring induction tube 541 to introduce the symbol water and desorption filtrate stirred in the stirring induction tube 541 into the stone sieve 570. Inlet hole 571 and a plurality of stones of a certain size are formed through the outside except the inlet hole, allowing small-sized stones to pass through and to be circulated and stirred, and to prevent large-sized stones from passing through to induce sedimentation in the lower part It is configured to include a circulation and strainer 572 .

For this reason, the symbol water and the desorption filtrate are introduced into the receiving part and stirred while stirring is continued until the stones are formed in a certain size during the stirring process, and the stones larger than a certain size cannot be floated to the upper part by the stone sieve 570 It is separated so as to settle at the bottom so that only the stones can be collected and discharged, and the upper water located in the upper water separation unit 511 above the receiving unit 510 in a state in which the stones are separated is discharged through the upper water discharge unit 550 . can be ejected.

Accordingly, magnesium, ammonium, and phosphorus are calcified and separated from the sewage-treated symbol water and the desorption filtrate, and the separated and calcified magnesium, ammonium, and phosphorus can be used as fertilizers, etc.

3 is a cross-sectional perspective view illustrating a state in which a stone induction unit is further provided in the generator in a sewage treatment facility capable of separating and treating stones according to an embodiment of the present invention.

Referring to FIG. 3 , the accommodating part 510 may further include a stone inducing part 580 for inducing the discharge of stones.

The stone induction unit 580 is installed in the lower portion of the other side provided with the stone discharge tube 560 to guide the stones precipitated and separated to the stone discharge tube 560 to be discharged, and is stirred toward the stone discharge tube 560 side. A stone induction nozzle 581 for discharging the sewage and guiding the stones to the stone discharge pipe 560, and a stone induction circulation pipe for circulating the sewage inside the receiving unit so that the sewage is sprayed toward the stone discharge nozzle 581 ( 582) and a stone induction pump 583 installed in the stone induction circulation pipe 582 to introduce sewage to be sprayed toward the stone induction nozzle 581.

At this time, the stone induction circulation pipe 582 is provided with a stone inflow prevention net 582a at the location where the sewage flows, so that it is possible to prevent a failure of the stone induction pump 583 due to the inflow of stones during the circulation process.

On the other hand, the stone inflow prevention network 582a is provided with the other side of the stone discharge pipe 560 in close contact with the inner surface side of the receiving unit, and it is possible to efficiently guide the stones to be deposited toward the stone discharge pipe 560 side.

In the present invention made as described above, in the sewage treatment facility, the symbol water generated in the anaerobic tank and the desorption filtrate generated in the dehydrator are introduced into the receiving part and stirred while adjusting the pH concentration to precipitate and separate magnesium, ammonium, and phosphorus. As a result, magnesium, ammonium, and phosphorus stones can be individually discharged from the lower part of the receiver while only the upper layer water that has been precipitated is discharged and treated, and the discharged magnesium, ammonium, and phosphorus stones can be used as fertilizer.

100: treatment tank 200: settling tank
300: anaerobic tank 400: dehydrator
500: generator 510: receiver
511: upper layer water separation unit 512: stone filter member
512a: sedimentation induction part 512b: floating prevention part
513: pH control unit 513a: chemical storage tank
513b: drug inlet pipe 513c: drug inlet pump
520: symbol water inlet pipe 530: desorption filtrate inlet pipe
531: distribution inlet pipe 531a: inlet hole
532: sand inlet pipe 540: stirring unit
541: stirring induction tube 541a: stirring induction tube support plate
542: stirring screw 543: stirring motor
544: drive shaft 550: upper water outlet
551: upper water induction part 551a: guide pipe
551b: circulation pump 551c: discharge hole
552: upper water collection unit 553: upper water discharge pipe
560: stone discharge pipe 570: stone sieve
571: inlet hole 572: circulation and filter hole
580: stone induction unit 581: stone induction nozzle
582: stone induction circulation tube 582a: stone inflow prevention network
583: absent induction pump

Claims (3)

When the sewage flows in, the treatment tank 100 for treating it to be purified;
a settling tank 200 provided together with the treatment tank 100 to precipitate and separate sediment from sewage;
An anaerobic tank 300 provided at the back of the treatment tank 100 and the settling tank 200 to reduce the concentration of pollutants by contacting domestic sewage with anaerobic bacteria that decompose high-concentration organic matter under anoxic conditions;
a dehydrator 400 for separating pollutants by centrifuging the sewage with reduced pollutants in the anaerobic tank 300; and
Symbol water is introduced from the anaerobic tank 300, and the desorption filtrate is introduced from the dehydrator 400, and magnesium, ammonium, and phosphorus substances are crystallized and separated from the sewage through the reaction and pH concentration control by the contact between the symbol water and the desorption filtrate. In including; a generator 500 to
The generator 500 is connected to the receiving part 510 from the anaerobic tank 300 to the receiving part 510 and the symbol water and the desorption filtrate are introduced and accommodated, and the symbol for introducing the symbol water from the anaerobic tank 300 . The symbol introduced into the water inlet pipe 520 and the desorption filtrate inlet pipe 530 and the receiving part 510 connected to the receiving part 510 from the dehydrator 400 to introduce the desorbed filtrate in the dehydrating machine 400 . Including a stirring unit 540 for stirring the water and the desorption filtrate,
The accommodating part 510 has an upper water discharging part 550 provided at the top and discharging the upper layer water generated in the upper layer where magnesium, ammonium and phosphorus are separated and precipitated in a crystalline state, and the lower part of the accommodating part 510 . The stone discharge pipe 560 and the accommodating part 510 provided at the bottom for discharging the precipitated stones and the stones generated from the symbol water and the desorption filtrate that are stirred by the stirring part 540 are introduced when the size is large. The stones are prevented from going up again while passing through the small stones and are continuously stirred and include a stone strainer 570 that separates the stones so that they are stirred,
In the desorption filtrate inlet pipe 530, the desorption filtrate is introduced from the dehydrator 400 by the distribution inlet pipe 531 provided in a circular shape along the inner circumference of the stirring guide pipe 541 of the stirring unit 540, It can be introduced to spread evenly to the outside of the agitated flow of sewage,
A sand inlet pipe 532 capable of introducing sand serving as a crystallization nucleus together with the desorption filtrate is connected to the distribution inlet pipe 531,
The upper water discharge unit 550 includes an upper water induction unit 551 provided in the upper water separation unit 511 to guide the upper water to one side, and an upper water inducing unit 551 provided on the outside of the receiving unit 510 and discharged. In comprising an upper water collecting part 552 to collect and an upper water discharge pipe 553 provided to extend below the upper water collecting part 552 to discharge the collected upper water,
The upper water induction unit 551 is provided in the upper water separation unit 511 and introduces the upper water from the upper water separation unit 511 to a guide pipe 551a for guiding it to be discharged to the upper water collecting unit 552 side; , a circulation pump 551b installed in the induction pipe 551a to circulate the upper water in the upper part of the accommodating part 510, and the upper water collecting part 552 for circulating the upper water flowing in from the induction pipe 551a. A sewage treatment facility capable of separating and treating stones, characterized in that it includes a discharge hole (551c) for discharging and guiding the flow of upper water to the upper water collecting unit (552).
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