KR102565078B1 - Water Treatment System with Thermal Energy Utilization Method of Purified Water Purified by Reverse Osmosis - Google Patents

Abstract

A water treatment system having a thermal energy utilization method of purified water purified by a reverse osmosis membrane according to the present invention is a raw water storage tank in which raw water to be treated is introduced and stored, and raw water flowing from the raw water storage tank along a predetermined flow path is first filtered to form an electrolyte. A first reverse osmosis membrane for generating the separated purified water, a second reverse osmosis membrane for generating purified water from which electrolyte is separated by secondary filtration of concentrated water remaining after purified water is separated through the first reverse osmosis membrane, and the first reverse osmosis membrane and the first reverse osmosis membrane. 2A purified water storage tank for storing purified water generated by the reverse osmosis membrane, a heat exchanger for heat-exchanging the purified water flowing from the purified water storage tank to a supply object with raw water flowing from the raw water storage tank to the first reverse osmosis membrane to increase the temperature of the raw water, and the heat exchanger The thermal energy of the purified water is transferred to the source water through a predetermined working fluid circulating through the flow path of the purified water flowing to the supply target through the heat exchanger and the flow path of the raw water flowing to the first reverse osmosis membrane through the heat exchanger to increase the temperature of the raw water It includes a heat pump that additionally raises it.

Description

Water Treatment System with Thermal Energy Utilization Method of Purified Water Purified by Reverse Osmosis}

The present invention relates to a water treatment system, and more particularly, to a water treatment system capable of improving energy efficiency by raising the temperature of raw water by utilizing thermal energy of purified water purified through a reverse osmosis membrane.

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 reverse osmosis membrane (RO) is widely used.

Such a reverse osmosis membrane has small pores capable of removing ultra-fine particles of 1 mm or less, and purifies water by passing water molecules through the semi-permeable membrane as a pressure higher than the osmotic pressure is applied.

The water treatment method using such a reverse osmosis membrane has the advantage of excellent ion removal rate and permeation flow rate, low production cost, and high-quality purified water.

However, the water treatment method using the reverse osmosis membrane has a problem in that the pressure value for water purification of the reverse osmosis membrane increases when the water temperature drops during a low temperature period, such as in winter, and the power consumption of the pressure pump increases. And this causes the overall system operation cost to increase.

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 purified water treated by the reverse osmosis membrane can be utilized to reduce the overall system operating cost and to provide a water treatment system capable of eco-friendly operation have a purpose to

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.

In order to achieve the above object, a water treatment system having a thermal energy utilization method of purified water purified by a reverse osmosis membrane of the present invention includes a raw water storage tank in which raw water to be treated is introduced and stored, and raw water flowing from the raw water storage tank along a predetermined flow path. A first reverse osmosis membrane for generating purified water from which electrolyte is separated by primary filtration, a second reverse osmosis membrane for generating purified water from which electrolyte is separated by secondary filtration of concentrated water remaining after purified water is separated through the first reverse osmosis membrane, A purified water storage tank for storing the purified water generated by the first reverse osmosis membrane and the second reverse osmosis membrane, and the purified water flowing from the purified water storage tank to the supply target is heat-exchanged with the raw water flowing from the raw water storage tank to the first reverse osmosis membrane to increase the temperature of the raw water. Thermal energy of purified water is transferred to raw water through a predetermined working fluid circulating through a heat exchanger that circulates through a flow path of purified water flowing to the supply target through the heat exchanger and a flow path of raw water flowing into the first reverse osmosis membrane through the heat exchanger and a heat pump that additionally increases the temperature of the raw water by transferring the water.

And the present invention further comprises a first flow pipe connecting the purified water storage tank from the raw water storage tank via the first reverse osmosis membrane and a second flow pipe connecting the purified water storage tank from the first reverse osmosis membrane to the purified water storage tank via the second reverse osmosis membrane. can include

In addition, the present invention may further include a microfiltration membrane provided upstream of the first reverse osmosis membrane in the first flow pipe to filter suspended substances.

In addition, the present invention may further include a purified water supply pipe for flowing purified water from the purified water storage tank to a supply target via the heat exchanger and the heat pump.

In this case, the purified water supply pipe may be formed to pass through the heat exchanger before the heat pump.

Meanwhile, the present invention may further include a concentrated water discharge pipe for flowing the concentrated water secondaryly filtered through the second reverse osmosis membrane to a water treatment system using a continuous batch reactor.

A water treatment system having a method of utilizing thermal energy of purified water purified by a reverse osmosis membrane of the present invention to solve the above problems is to utilize the thermal energy of purified water purified through a first reverse osmosis membrane and a second reverse osmosis membrane to raise the temperature of raw water Accordingly, it has the advantage of improving energy efficiency by reducing the power consumption of the supply pump for supplying raw water.

In particular, the present invention can more effectively increase the temperature of raw water through a multi-stage heat exchange process through a heat exchanger and a heat pump.

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 is a view showing the flow of fluid passing through a heat exchanger in the water treatment system according to the first embodiment of the present invention;
3 is a diagram showing the flow of fluid passing through a heat pump in the water treatment system according to the first embodiment of the present invention;
4 is a diagram schematically showing a water treatment system according to a second embodiment of the present invention; and
5 is a diagram schematically showing a water treatment system according to a third 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 raw water storage tank 10, a first reverse osmosis membrane 20, a second reverse osmosis membrane 30, a purified water storage tank 40, and a heat exchanger 50. ) and a heat pump 60.

In the raw water storage tank 10, raw water, which is a treatment target for filtering and purifying pollutants, is introduced and stored.

And, the first reverse osmosis membrane 20 performs a role of generating purified water from which electrolyte is separated by first filtering the raw water flowing from the raw water storage tank 10 along a predetermined flow path.

In addition, the second reverse osmosis membrane 30 secondarily filters concentrated water remaining after purified water is separated through the first reverse osmosis membrane 20 to generate purified water from which electrolytes are separated.

The first reverse osmosis membrane 20 and the second reverse osmosis membrane 30 purify water in such a way that water molecules pass through the semi-permeable membrane as a pressure higher than the osmotic pressure is applied.

The purified water storage tank 40 is provided to store the purified water generated by the first reverse osmosis membrane 20 and the second reverse osmosis membrane 30 . That is, purified water purified through a single filtration process by the first reverse osmosis membrane 20 and purified water purified through a multi-stage filtration process through both the first reverse osmosis membrane 20 and the second reverse osmosis membrane 30 are included in the purified water storage tank 40. It can enter through different routes.

At this time, in this embodiment, the first flow pipe 100 connecting the purified water storage tank 40 from the raw water storage tank 10 via the first reverse osmosis membrane 20, and the second reverse osmosis membrane 30 from the first reverse osmosis membrane 20 ) and a second flow pipe 200 connecting the purified water storage tank 40 via.

In this embodiment, the flow rate of the purified water flowing into the purified water storage tank 40 through the first reverse osmosis membrane 20 through the first flow pipe 100 may be about 83% of the total flow rate, and the remaining flow rate is about 17%. flows toward the second flow pipe 200.

In addition, about 17% of the flow rate flowing through the second flow pipe 200 is purified by about 12.4% of the initial total flow rate by the second reverse osmosis membrane 30, and the remaining about 4.6% of the flow rate is a continuous batch type reactor ( It can flow to the water treatment system using Sequencing Batch Reactor (SBR).

In addition, in the case of this embodiment, a microfiltration membrane 15 (Micro Filtration, MF) provided upstream of the first reverse osmosis membrane 20 in the first flow pipe 100 may further include filtering the suspended matter. As such a microfiltration membrane 15, various forms such as an organic membrane, an inorganic membrane, and a metal membrane may be applied without limitation.

In addition, the present embodiment may further include a purified water supply pipe 300 for flowing purified water from the purified water storage tank 40 to a supply target via a heat exchanger 50 and a heat pump 60 to be described later.

In addition, the present embodiment may further include a concentrated water discharge pipe 210 for flowing the concentrated water secondaryly filtered through the second reverse osmosis membrane 30 to a water treatment system using a sequencing batch reactor (SBR). there is.

The heat exchanger 50 serves to increase the temperature of the raw water by exchanging heat with raw water flowing from the purified water storage tank 40 to a predetermined supply target and raw water flowing from the raw water storage tank 10 to the first reverse osmosis membrane 20. .

2 is a diagram showing the flow of fluid passing through a heat exchanger in the water treatment system according to the first embodiment of the present invention.

As shown in FIG. 2, the heat exchanger 50 has a low temperature raw water flowing through the first flow pipe 100, the first reverse osmosis membrane 20 and the second reverse osmosis membrane 30, and in the process of being purified, the temperature increases. As the high-temperature purified water that rises and flows into the purified water supply pipe 300 exchanges heat with each other, the temperature of the raw water flowing into the first flow pipe 100 is increased.

The reason for doing this is that when the water temperature drops, the pressure value for water purification of the reverse osmosis membranes 20 and 30 increases and the power consumption of the pressure pump increases. To prevent this, the supply of raw water by raising the temperature of the raw water This is to improve energy efficiency by reducing the power consumption of the pump.

The heat pump 60 circulates through a flow path of purified water flowing to the supply target via the heat exchanger 50 and a flow path of raw water flowing to the first reverse osmosis membrane 20 via the heat exchanger 50. Through the working fluid of the, it transfers the thermal energy of the purified water to the raw water to further increase the temperature of the raw water.

Since the structure and operating mechanism of the heat pump 60 are obvious to those skilled in the art, a detailed description of the heat pump 60 will be omitted.

3 is a diagram showing the flow of fluid passing through the heat pump 60 in the water treatment system according to the first embodiment of the present invention.

As shown in FIG. 3, the heat pump 60 increases the temperature in the course of purification through low-temperature raw water flowing through the first flow pipe 100 and the first reverse osmosis membrane 20 and the second reverse osmosis membrane 30. The temperature of the raw water flowing through the first flow pipe 100 is further increased, including the high-temperature purified water that rises and flows into the purified water supply pipe 300 and the working fluid that performs heat exchange.

That is, the present embodiment can increase the temperature of the raw water more effectively through a multi-stage heat exchange process through the heat exchanger 50 and the heat pump 60.

In particular, in this embodiment, the purified water supply pipe 300 is formed to pass through the heat exchanger 50 before the heat pump 60.

As described above, the present invention utilizes the thermal energy of the purified water purified through the first reverse osmosis membrane 20 and the second reverse osmosis membrane 30 to increase the temperature of the raw water, thereby reducing the power consumption of the supply pump supplying the raw water. Energy efficiency can be improved.

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.

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

The second embodiment of the present invention shown in FIG. 4, like the first embodiment described above, has a raw water storage tank 10, a first reverse osmosis membrane 20, a second reverse osmosis membrane 30, a purified water storage tank 40, and a heat exchanger. (50) and a heat pump (60).

In addition, the point that the first flow pipe 100, the second flow pipe 200, and the purified water supply pipe 300 are provided together is the same.

However, in the case of the present embodiment, the purified water storage tank 40 has a feature in that two spaces including the first purified water inlet space 41 and the second purified water inlet space 42 are formed in a partitioned form.

In particular, in this embodiment, the purified water filtered in a single process by the first reverse osmosis membrane 20 flows into the first purified water inlet space 41, and the first reverse osmosis membrane 20 and Purified water filtered through a multi-stage process by the second reverse osmosis membrane 30 is introduced.

Accordingly, within the purified water storage tank 40, purified water filtered through a single process and purified water filtered through a multi-stage process are not mixed with each other.

In the present embodiment, the first sensor unit 41a is provided in the first purified water inlet space 41 and the second sensor unit 42a is provided in the second purified water inlet space 42 . The first sensor unit 41a and the second sensor unit 42a respectively sense the temperature and storage flow rate of the purified water accommodated in the corresponding space.

In addition, although not shown, the present embodiment may further include a control unit, and such a control unit controls the temperature and storage flow rate of the purified water stored in the first purified water inlet space 41 and the purified water stored in the second purified water inlet space 42. In consideration of this, the supply flow rate of purified water discharged from each of the first purified water inlet space 41 and the second purified water inlet space 42 to the purified water supply pipe 300 is individually controlled.

That is, by doing this, the present embodiment can precisely set the temperature of the purified water flowing to the heat exchanger 50 through the purified water supply pipe 300, and accordingly, by the heat exchanger 50 and the heat pump 60 It is possible to precisely control the temperature of the heat-exchanged raw water to the target temperature.

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

The third embodiment of the present invention shown in FIG. 5 has all the same components as the above-described second embodiment.

That is, the present embodiment, like the first embodiment, includes the raw water storage tank 10, the first reverse osmosis membrane 20, the second reverse osmosis membrane 30, the purified water storage tank 40, the heat exchanger 50 and the heat pump 60. It includes a first flow pipe 100, a second flow pipe 200, and a purified water supply pipe 300, and the purified water storage tank 40 includes a first purified water inlet space 41 and a second purified water inlet space 42 It is also the same that the two spaces, including , are formed in a form partitioned from each other.

However, the present embodiment is characterized by further including a first auxiliary bypass pipe 41b and a second auxiliary bypass pipe 42b.

Specifically, the first auxiliary bypass pipe 41b is formed to communicate the first purified water inlet space 41 of the purified water storage tank 40 and the downstream of the purified water supply pipe 300 to each other, and the second auxiliary bypass pipe ( 42b) is formed so that the second purified water inlet space 42 of the purified water storage tank 40 and the downstream of the purified water supply pipe 300 communicate with each other.

And, in the present embodiment, the control unit considers the temperature and storage flow rate of the purified water stored in the first purified water inlet space 41 and the purified water stored in the second purified water inlet space 42 as in the above-described second embodiment, The supply flow rate of purified water discharged from each of the purified water inlet space 41 and the second purified water inlet space 42 to the purified water supply pipe 300 is individually controlled.

In addition, in the present embodiment, the control unit causes at least one of the purified water accommodated in the first purified water inlet space 41 and the second purified water inlet space 42 to be left in a continuously stored state without being used smoothly, resulting in insufficient storage capacity. In this case, the purified water in the space with insufficient storage capacity flows directly to the downstream side of the purified water supply pipe 300 through the first auxiliary bypass pipe 41b or the second auxiliary bypass pipe 42b so that the heat exchanger 50 and As it is controlled so that it is directly supplied to the supply target without passing through the heat pump 60, the continuous operation of the system is possible.

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: raw water reservoir
15: microfiltration membrane
20: first reverse osmosis membrane
30: second reverse osmosis membrane
40: purified water storage tank
41: first purified water inlet space
41a: first sensor unit
41b: first auxiliary bypass pipe
42: second purified water inlet space
42a: second sensor unit
42b: second auxiliary bypass pipe
50: heat exchanger
60: heat pump
100: first flow pipe
200: second flow pipe
300: purified water supply pipe

Claims (6)

A raw water storage tank in which raw water to be treated is introduced and stored;
A first reverse osmosis membrane for generating purified water from which electrolyte is separated by first filtering raw water flowing along a predetermined flow path from the raw water storage tank;
a second reverse osmosis membrane for generating purified water from which electrolyte is separated by secondary filtration of the concentrated water remaining after the purified water is separated through the first reverse osmosis membrane;
a purified water storage tank for storing purified water generated by the first reverse osmosis membrane and the second reverse osmosis membrane;
a heat exchanger that heats the purified water flowing from the purified water storage tank to the supply target with the raw water flowing from the raw water storage tank to the first reverse osmosis membrane to increase the temperature of the raw water; and
The thermal energy of the purified water is transferred to the raw water through a predetermined working fluid circulating through the flow path of the purified water flowing to the supply target through the heat exchanger and the flow path of the raw water flowing into the first reverse osmosis membrane through the heat exchanger. a heat pump that additionally increases the temperature;
Including,
The purified water storage tank,
a first purified water inlet space into which purified water filtered through a single process by the first reverse osmosis membrane flows;
Purified water filtered in the multi-stage process by the first reverse osmosis membrane and the second reverse osmosis membrane is introduced, and the second purified water inflow separated from the first purified water inlet space so that the introduced purified water is not mixed with the purified water in the first purified water inlet space. space;
a first sensor unit for sensing the temperature and storage flow rate of the purified water accommodated in the first purified water inlet space; and
a second sensor unit for sensing the temperature and storage flow rate of the purified water accommodated in the second purified water inlet space;
including,
The supply flow rate of purified water discharged from the first purified water inlet space and the second purified water inlet space, respectively, in consideration of the temperature and storage flow rate of the purified water stored in the first purified water inlet space and the purified water stored in the second purified water inlet space Further comprising a control unit for individual control,
A water treatment system that utilizes the thermal energy of purified water purified by a reverse osmosis membrane. According to claim 1,
a first flow pipe connecting the raw water storage tank to the purified water storage tank via the first reverse osmosis membrane; and
a second flow pipe connecting the purified water storage tank from the first reverse osmosis membrane via the second reverse osmosis membrane;
Including more,
A water treatment system that utilizes the heat energy of purified water purified by a reverse osmosis membrane. According to claim 2,
Further comprising a microfiltration membrane provided upstream of the first reverse osmosis membrane in the first flow pipe to filter suspended matter,
A water treatment system that utilizes the heat energy of purified water purified by a reverse osmosis membrane. According to claim 1,
Further comprising a purified water supply pipe for flowing purified water from the purified water storage tank to a supply target via the heat exchanger and the heat pump,
A water treatment system that utilizes the heat energy of purified water purified by a reverse osmosis membrane. According to claim 4,
The purified water supply pipe is formed to pass through the heat exchanger first before the heat pump.
A water treatment system that utilizes the heat energy of purified water purified by a reverse osmosis membrane. According to claim 1,
Further comprising a concentrated water discharge pipe for flowing the concentrated water filtered through the second reverse osmosis membrane to a water treatment system using a continuous batch reactor.
A water treatment system that utilizes the heat energy of purified water purified by a reverse osmosis membrane.