KR102522959B1 - Water Treatment System Using Selective Heat Storage Method and Sequencing Batch Reactor - Google Patents

Abstract

According to the present invention, a water treatment system using a selective heat storage method and a continuous batch reaction tank comprises: a concentrated water storage tank in which concentrated water generated from a reverse osmosis membrane (RO) water treatment process is introduced and stored; a continuous batch reaction tank receiving the concentrated water stored in the concentrated water storage tank and removing nitrogen and phosphorus contained in the concentrated water through microbial activity; a discharge tank receiving, storing, and discharging treated water treated in the continuous batch reaction tank; a heat storage tank provided to accumulate heat energy; a heat pump recovering the heat of the treated water stored in the discharge tank as a heat source and transferring the same to the heat storage tank; a boiler generating heat through a predetermined fuel and transferring the same to the heat storage tank; and a heat exchanger transferring the heat accumulated in the heat storage tank to the concentrated water flowing from the concentrated water storage tank to the continuous batch reaction tank to heat the concentrated water. The heat storage tank is formed to selectively convert and accumulate the heat energy generated from either the heat pump or the boiler. Accordingly, fuel costs can be minimized and energy efficiency can be greatly improved.

Description

Water Treatment System Using Selective Heat Storage Method and Sequencing Batch Reactor

The present invention relates to a water treatment system, and more particularly, by selectively replacing a heat source for accumulating heat in a heat storage tank, it is possible to improve energy efficiency by heating concentrated water flowing into a continuous batch type reactor. It is about a water treatment system.

In general, in the process of selecting a sewage treatment method, inflow sewage volume and water quality, target water quality of treated water, linkage and return water treatment plan, location conditions of treatment plant, current and future use of discharged water, construction cost and maintenance cost, etc. Factors such as economic feasibility, ease of maintenance, regulations by laws and regulations, and plans to reuse treated water are considered.

Recently, as a representative advanced treatment method among various water treatment methods, a water treatment method using a sequencing batch reactor (SBR) is widely used.

The water treatment method using a continuous batch reactor continuously performs the inflow-reaction-precipitation-discharge-stop process in a single reactor, and biologically treats the sewage by applying anoxic, anaerobic, and aerobic conditions to It is a method to remove organic matter, nitrogen and phosphorus.

Unlike other water treatment methods, the water treatment method using such a continuous batch reaction tank does not require sedimentation equipment and conveyance equipment because all processes are performed in a single reactor, and there is no leakage of MLSS (Mixed Liquor Suspended Solid) even in hydraulic overload. there is

However, the water treatment method using a continuous batch reactor requires a process of heating influent water to create a microbial environment for effluent water treatment in low temperature periods such as in winter.

Accordingly, conventionally, inflow water is heated using a heating device such as a boiler that obtains thermal energy using fossil fuels, etc., but this method increases the cost of operating the entire system due to an increase in fuel costs, and various pollutants There was a problem that it was not environmentally friendly because the material was additionally generated.

Therefore, a method for solving these problems is required.

Korean Patent Registration No. 10-0453479

The present invention is an invention made to solve the above-mentioned problems of the prior art, so that the thermal energy remaining in the treated water treated by the continuous batch reactor can be utilized, thereby reducing the overall system operating cost and enabling eco-friendly operation. Water treatment It has a purpose to provide a system.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

A water treatment system using a selective heat storage method and a continuous batch reactor of the present invention for achieving the above object is a concentrated water storage tank in which concentrated water generated in a reverse osmosis membrane (RO) water treatment process is introduced and stored, and concentrated water stored in the concentrated water storage tank. A continuous batch reactor for receiving and removing nitrogen and phosphorus contained in concentrated water through microbial activity, a discharge tank for receiving, storing and discharging the treated water treated in the continuous batch reactor, a heat storage tank provided to accumulate thermal energy, the above A heat pump that recovers heat from the treated water stored in the discharge tank as a heat source and transfers it to the heat storage tank, a boiler that generates heat through a predetermined fuel and transfers it to the heat storage tank, and transfers the heat accumulated in the heat storage tank to the concentrated water storage tank. A heat exchanger is provided to heat the concentrated water flowing toward the continuous batch reactor, and the heat storage tank is configured to selectively convert and store thermal energy generated from either the heat pump or the boiler.

And the present invention may further include a treated water circulation pipe through which the treated water stored in the discharge tank is circulated.

In addition, the present invention provides a first working fluid circulation pipe through which a predetermined working fluid is circulated via the heat storage tank, and a predetermined working fluid is circulated via the heat storage tank, forming a path different from that of the first working fluid circulation pipe. A third working fluid circulation pipe forming a path different from the first working fluid circulation pipe and the second working fluid circulation pipe, wherein a predetermined working fluid is circulated via the second working fluid circulation pipe and the heat storage tank, is further provided. can include

In this case, the heat pump may recover heat of the treated water circulating through the treated water circulation pipe as a heat source and transfer the heat to the working fluid circulating through the first working fluid circulation pipe.

The heat exchanger may transfer heat of the working fluid circulating through the second working fluid circulation pipe to the concentrated water flowing from the concentrated water storage tank toward the continuous batch reaction tank for heating.

In addition, the boiler may transfer heat generated in the process of burning fuel to the working fluid circulating through the third working fluid circulation pipe.

In addition, the heat storage tank may be formed to selectively supply accumulated thermal energy to a separate external facility.

On the other hand, the present invention circulates a predetermined working fluid via the heat storage tank, but forms a path different from the first working fluid circulation pipe, the second working fluid circulation pipe, and the third working fluid circulation pipe, thereby providing a separate external A fourth working fluid circulation pipe for supplying heat energy to the facility may be further included.

can include

In order to solve the above problems, the water treatment system using the selective heat storage method and the continuous batch reactor of the present invention selects any one of the thermal energy remaining in the treated water treated by the continuous batch reactor or the thermal energy generated by the boiler to supply the heat storage tank. Since the heat stored in the heat storage tank is stored and heated by transferring the heat accumulated in the heat storage tank through the heat exchanger to the concentrated water flowing from the concentrated water storage tank to the continuous batch reaction tank, it has the advantage of minimizing the separately used fuel cost and greatly improving energy efficiency. .

In addition, the present invention has the advantage of being eco-friendly because it can minimize the emission of pollutants by driving the heat pump during the low load period to minimize the use of fossil fuel in the water treatment process.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram schematically showing a water treatment system according to a first embodiment of the present invention;
2 schematically shows a water treatment system according to a second embodiment of the present invention;
3 schematically shows a water treatment system according to a third embodiment of the present invention;
4 is a diagram schematically showing a water treatment system according to a fourth embodiment of the present invention; and
5 is a diagram schematically showing a water treatment system according to a fifth embodiment of the present invention.

In this specification, when an element (or region, layer, section, etc.) is referred to as being “on,” “connected to,” or “coupled to” another element, it is directly placed/placed on the other element. It means that they can be connected/combined or a third component may be placed between them.

Like reference numerals designate like components. Also, in the drawings, the thickness, ratio, and dimensions of components are exaggerated for effective description of technical content.

“And/or” includes any combination of one or more that the associated elements may define.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, terms such as "below", "lower side", "above", and "upper side" are used to describe the relationship between components shown in the drawings. The above terms are relative concepts and will be described based on the directions shown in the drawings.

Unless defined otherwise, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, terms such as terms defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the related art, and are not explicitly defined herein unless interpreted in an ideal or overly formal sense. do.

Terms such as "include" or "have" are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but that one or more other features, numbers, or steps are present. However, it should be understood that it does not preclude the possibility of existence or addition of operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a diagram schematically showing a water treatment system according to a first embodiment of the present invention.

As shown in FIG. 1, the water treatment system according to the first embodiment of the present invention includes a concentrated water storage tank 10, a continuous batch storage tank 20, a discharge tank 30, a heat storage tank 50, and a heat pump 40. , a boiler 70 and a heat exchanger 60.

In the concentrated water storage tank 10, concentrated wastewater (hereinafter referred to as concentrated water) generated in the reverse osmosis (RO) water treatment process performed prior to the water treatment process using the continuous batch reactor (20, Sequencing Batch Reactor, SBR) of the present invention is imported and stored

And the continuous batch storage tank 20 is configured to receive the concentrated water stored in the concentrated water storage tank 10 through the first flow pipe 15 and remove nitrogen and phosphorus contained in the concentrated water through microbial activity. Since the water treatment process performed through the continuous batch storage tank 20 is obvious to those skilled in the art, a detailed description of the treatment process will be omitted.

The discharge tank 30 receives the treated water processed in the continuous batch type reactor 20 through the second flow pipe 25 and stores and discharges the treated water. It is exemplified that it can be stored for about 6 hours.

Further, the discharge tank 30 may be operated to complete discharge of the current treated water until the treated water subsequently treated in the immediately previous continuous batch storage tank 20 flows in.

The heat storage tank 50 is provided to accumulate thermal energy, and the thermal energy accumulated in the heat storage tank 50 can then transfer the heat accumulated in the heat storage tank to the concentrated water flowing from the concentrated water storage tank 10 to the continuous batch reaction tank 20. there is.

The heat pump 40 is configured to recover heat from the treated water stored in the discharge tank as a heat source and transfer it to the heat storage tank 50 . That is, in this embodiment, the heat pump 40 recovers the thermal energy of the treated water that is discarded as the temperature rises in the continuous batch type storage tank 20 and is discharged through the discharge tank 30 as a heat source, and accumulates it in the heat storage tank 50. Let it be.

Since the structure and operating mechanism of the heat pump 40 are also obvious to those skilled in the art, a detailed description of the heat pump 40 will be omitted.

The boiler 70 is configured to generate heat through a process of burning a predetermined fuel and transfer it to the heat storage tank 50 .

That is, the boiler 70 is provided so as to be operably complementary to the heat pump 40, and the heat storage tank 50 selectively converts and stores thermal energy generated from either the heat pump 40 or the boiler 70. is formed to

Accordingly, the heat storage tank 50 of the present embodiment uses the heat pump 40 to accumulate thermal energy of the treated water during a low load period when electricity costs are low or a period when fuel costs are high, and in other cases, the boiler 70 is used to accumulate fuel It is possible to minimize the overall operating cost by accumulating the heat energy generated in the process of burning.

Meanwhile, as the fuel used in the boiler 70, various fossil fuels or non-fossil fuels including LNG, kerosene, and the like may be applied without limitation.

The heat exchanger 60 transfers the heat accumulated in the heat storage tank 50 to the concentrated water flowing from the concentrated water storage tank 10 toward the continuous batch reaction tank 20 and serves to heat it.

And for the above water treatment process, the present embodiment includes the treated water circulation pipe 100, the first working fluid circulation pipe 210, the second working fluid circulation pipe 220 and the third working fluid circulation pipe 230 more includes

The treated water circulation pipe 100 is provided to circulate the treated water stored in the discharge tank 30 along a path passing through the heat pump 40 .

In addition, the first working fluid circulation pipe 210 forms a path through which a predetermined working fluid is circulated via the heat storage tank 50 and the heat pump 40 .

The second working fluid circulation pipe 210 forms a path different from that of the first working fluid circulation pipe 210 so that a predetermined working fluid is circulated via the heat storage tank 50 and the heat exchanger 60 .

In addition, the third working fluid circulation pipe 230 circulates a predetermined working fluid via the heat storage tank 50, but takes a path different from the first working fluid circulation pipe 210 and the second working fluid circulation pipe 220. form

Accordingly, in the present embodiment, the heat pump 40 recovers the heat of the treated water circulating through the treated water circulation pipe 100 as a heat source and transfers it to the working fluid circulating through the first working fluid circulation pipe 2100. As a result, heat is accumulated in the heat storage tank 50.

The boiler 70 transfers the heat generated in the process of burning the fuel to the working fluid circulating through the third working fluid circulation pipe, and as a result, heat is accumulated in the heat storage tank 50 .

The heat pump 40 and the boiler 70 may be operated complementary to each other, or may be operated simultaneously in some cases.

Thereafter, the heat exchanger 60 transfers the heat of the working fluid circulating through the second working fluid circulation pipe 220 to the concentrated water flowing from the concentrated water storage tank to the continuous batch reaction tank through the first flow pipe 15 for heating. will do

That is, in the case of the present embodiment, the residual heat of the treated water introduced into the discharge tank 30 is transferred to the heat storage tank 50 through the heat pump 40, or the heat generated by combustion of fuel in the boiler 70 is transferred to the heat storage tank 50. ), and then transferred to the concentrated water flowing from the concentrated water storage tank 10 to the continuous batch reaction tank 20 through the heat exchanger 60, thereby minimizing the fuel cost used separately and increasing energy efficiency. can be greatly improved.

In addition, the present invention has the advantage of being eco-friendly because it can minimize the emission of pollutants by driving the heat pump 40 during the low load period to minimize the use of fossil fuel in the water treatment process.

Hereinafter, other embodiments of the present invention will be described. At this time, in each embodiment to be described below, redundant description of components provided identically to those of the first embodiment described above will be omitted.

2 is a schematic diagram of a water treatment system according to a second embodiment of the present invention.

The second embodiment of the present invention shown in FIG. 2, like the first embodiment described above, includes a concentrated water storage tank 10, a continuous batch storage tank 20, a discharge tank 30, a heat storage tank 50, a heat pump ( 40) and a heat exchanger 60, together with the treated water circulation pipe 100, the first working fluid circulation pipe 210, the second working fluid circulation pipe 220 and the third working fluid circulation pipe 230 includes

However, in this embodiment, the heat storage tank 50 has a feature of being formed to selectively supply the accumulated thermal energy to a separate external facility 80.

That is, in the heat storage tank 50, the heat of the working fluid circulating through the second working fluid circulation pipe 220 through the heat exchanger 60 is concentrated through the first flow pipe 15 from the concentrated water storage tank to the continuous batch reaction tank. It may have a method of supplying the accumulated heat energy to a separate external facility 80 according to a predetermined algorithm while heating by transferring to water.

At this time, the external facility 80 may be a heating device applied to specific facilities provided in the system, or may be a hot water supply means for supplying hot water. Of course, the types of external facilities 80 are not limited to those presented in this embodiment.

In addition, the present embodiment can secure heating capacity by increasing the capacity of the heat storage tank 50 to accumulate thermal energy over a plurality of water treatment processes rather than a single water treatment process.

And, in this embodiment, a predetermined working fluid is circulated via the heat storage tank 50, and the first working fluid circulation pipe 210, the second working fluid circulation pipe 220 and the third working fluid circulation pipe 230 and may further include a fourth working fluid circulation pipe 240 that supplies heat energy to a separate external facility 80 by forming another path.

3 is a schematic diagram of a water treatment system according to a third embodiment of the present invention.

The third embodiment of the present invention shown in Figure 3, like the first and second embodiments described above, the concentrated water storage tank 10, the continuous batch storage tank 20, the discharge tank 30, the heat storage tank 50 ), a heat pump 40 and a heat exchanger 60, together with a first working fluid circulation pipe 210, a second working fluid circulation pipe 220 and a third working fluid circulation pipe 230 .

However, in this embodiment, the treated water circulation pipe 100 provided in the first and second embodiments is omitted, and the second flow pipe 25 directly passes through the heat pump 40. As it is formed, it has a feature of replacing the role of the treated water circulation pipe 100.

That is, unlike other embodiments in which the treated water treated in the continuous batch storage tank 20 flows into the discharge tank 30 and then circulated through the treated water circulation pipe 100 and passes through the heat pump 40, this embodiment Since the treated water treated in the continuous batch storage tank 20 passes directly through the heat pump 40 before being introduced into the discharge tank 30, thermal efficiency can be further improved.

4 is a diagram schematically showing a water treatment system according to a fourth embodiment of the present invention.

The fourth embodiment of the present invention shown in Figure 4, like the first and second embodiments described above, the concentrated water storage tank 10, the continuous batch storage tank 20, the discharge tank 30, the heat storage tank 50 ), a heat pump 40 and a heat exchanger 60, together with the treated water circulation pipe 100, the first working fluid circulation pipe 210, the second working fluid circulation pipe 220 and the third working fluid It includes a circulation pipe 230.

However, in the case of the present embodiment, the discharge tank 30 has a feature in that two spaces including the treated water inlet space 31 and the treated water discharge standby space 32 are formed in a mutually partitioned form.

In particular, in this embodiment, the treated water circulation pipe 100 circulates the treated water introduced into the treated water inlet space 31 after being treated in the continuous batch storage tank 20 to pass through the heat pump 40, and the heat pump The treated water after the heat exchange is made via the (40) is introduced into the treated water discharge waiting space (32).

That is, the present embodiment can prevent the treated water introduced into the treated water inlet space 31 after being treated in the continuous batch storage tank 20 from mixing with the treated water heat exchanged through the treated water circulation pipe 100. , Accordingly, the thermal efficiency can be further improved.

However, although not shown, the discharge tank 30 may further include an open/close door capable of being opened and closed so that the treated water inlet space 31 and the treated water discharge waiting space 32 can be selectively communicated with each other.

Accordingly, when the temperature of the treated water introduced into the treated water discharge waiting space 32 is higher than the discharge reference temperature, the treated water of the treated water discharge waiting space 32 flows into the treated water inlet space 31 by opening the door. By doing so, recirculation can be made to further improve thermal efficiency.

In addition, the discharge tank 30 may further include a backflow prevention valve to prevent the treated water in the treated water inlet space 31 from flowing back to the treated water discharge waiting space 32 in a state in which the opening and closing door is opened.

5 is a diagram schematically showing a water treatment system according to a fifth embodiment of the present invention.

The fifth embodiment of the present invention shown in FIG. 5 includes a concentrated water storage tank 10, a continuous batch storage tank 20, a discharge tank 30, a heat storage tank 50, and a heat pump as in the fourth embodiment described above. (40) and a heat exchanger (60), together with the treated water circulation pipe (100), the first working fluid circulation pipe (210), the second working fluid circulation pipe (220) and the third working fluid circulation pipe (230). ).

Also, the discharge tank 30 is formed in a form in which two spaces including a treated water inlet space 31 and a treated water discharge standby space 32 are divided from each other, the same as in the fourth embodiment.

Accordingly, in this embodiment, the treated water circulation pipe 100 also circulates the treated water introduced into the treated water inlet space 31 after being treated in the continuous batch storage tank 20 to pass through the heat pump 40, Through the pump 40, treated water after heat exchange is introduced into the treated water discharge waiting space 32.

However, in this embodiment, the treated water circulation pipe 100 has a form further including a branching path for flowing the treated water after heat exchange via the heat pump 40 toward the treated water inlet space 31.

In addition, a three-way valve 110 is provided between the branching path and the path through which the treated water flows into the treated water discharge waiting space 32, and the present embodiment can control to selectively open or close any one of the two paths. .

In addition, a temperature sensor 120 for measuring the temperature of the treated water may be further provided between the three-way valve 110 and the area through which the heat pump 40 passes through the entire route of the treated water circulation pipe 100 .

Accordingly, the present embodiment measures the temperature of the treated water circulating through the treated water circulation pipe 100 by the temperature measuring sensor 120, and controls the three-way valve 110 when the temperature is below the discharge reference temperature. Allow the water to flow into the treated water discharge waiting space 32, and when the temperature exceeds the discharge reference temperature, control the three-way valve 110 to allow the treated water to flow into the treated water inlet space 31 so that recirculation is achieved. can

As described above, the preferred embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope in addition to the above-described embodiments is a matter of ordinary knowledge in the art. It is self-evident to them. Therefore, the embodiments described above are to be regarded as illustrative rather than restrictive, and thus the present invention is not limited to the above description, but may vary within the scope of the appended claims and their equivalents.

10: concentrated water storage tank
15: first flow pipe
20: continuous batch storage tank
25: second flow pipe
30: discharge tank
31: treated water inlet space
32: Waiting space for discharge of treated water
40: heat pump
50: heat storage tank
60: heat exchanger
70: boiler
80: external facility
100: treated water circulation pipe
110: three-way valve
120: temperature measurement sensor
210: first working fluid circulation pipe
220: second working fluid circulation pipe
230: third working fluid circulation pipe
240: 4th working fluid circulation pipe

Claims (8)

A concentrated water storage tank into which concentrated water generated in a reverse osmosis membrane (RO) water treatment process is introduced and stored;
A continuous batch type reactor receiving the concentrated water stored in the concentrated water storage tank and removing nitrogen and phosphorus contained in the concentrated water through microbial activity;
A discharge tank for receiving, storing and discharging the treated water treated in the continuous batch type reactor;
a heat storage tank provided to accumulate thermal energy;
a heat pump recovering heat from the treated water stored in the discharge tank as a heat source and transferring the heat to the heat storage tank;
A boiler that generates heat through a predetermined fuel and transfers it to the heat storage tank;
a heat exchanger for transferring heat accumulated in the heat storage tank to the concentrated water flowing from the concentrated water storage tank to the continuous batch reaction tank for heating; and
Including; treated water circulation pipe through which the treated water stored in the discharge tank is circulated,
On the other hand, the discharge tank is configured to include a treated water inlet space into which the treated water flows and a discharge waiting space for maintaining a standby state before discharging the treated water,
The treated water circulation pipe is configured to circulate the treated water introduced into the treated water inlet space and introduce it into the treated water discharge waiting space after passing through the heat pump,
The treated water circulation pipe further includes a branching path for flowing the treated water via the heat pump into the treated water inlet space,
In addition, the heat storage tank is formed to selectively convert and accumulate thermal energy generated from either the heat pump or the boiler,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 1,
A three-way valve is provided between the branch path and the path through which the treated water flows into the treated water discharge waiting space,
A temperature sensor for measuring the temperature of the treated water is additionally provided between the three-way valve and the via region of the heat pump,
Is configured to control the opening and closing of the three-way valve according to the measured value of the temperature sensor,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 2,
a first working fluid circulation pipe through which a predetermined working fluid is circulated via the heat storage tank;
a second working fluid circulation pipe that circulates a predetermined working fluid via the heat storage tank and forms a path different from that of the first working fluid circulation pipe; and
a third working fluid circulation pipe that circulates a predetermined working fluid via the heat storage tank and forms a path different from the first working fluid circulation pipe and the second working fluid circulation pipe;
Including more,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 3,
The heat pump,
Recovering the heat of the treated water circulating through the treated water circulation pipe as a heat source and transferring it to the working fluid circulating through the first working fluid circulation pipe,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 3,
The heat exchanger,
Heating by transferring the heat of the working fluid circulating through the second working fluid circulation pipe to the concentrated water flowing from the concentrated water storage tank to the continuous batch reaction tank,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 3,
The boiler,
Transferring the heat generated in the process of burning fuel to the working fluid circulating through the third working fluid circulation pipe,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 3,
The heat storage tank is formed to selectively supply the accumulated thermal energy to a separate external facility,
Water treatment system using selective heat storage method and continuous batch type reactor. According to claim 7,
A predetermined working fluid is circulated via the heat storage tank, but a path different from the first working fluid circulation pipe, the second working fluid circulation pipe, and the third working fluid circulation pipe is formed to provide heat energy to a separate external facility. a fourth working fluid circulation pipe supplying;
Including more,
Water treatment system using selective heat storage method and continuous batch type reactor.

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