KR102175647B1 - Water treatment system and method for reuse of waste water and seawater desalination - Google Patents

Abstract

By concentrating raw water to produce methane gas, and diluting the purified raw water in seawater and using it for desalination, the invention of a water treatment process system and method for the reuse of sewage and seawater desalination improves the reuse rate of sewage. Is initiated.
The disclosed water treatment process system for wastewater reuse and seawater desalination includes a first forward osmosis treatment unit receiving raw water and seawater, a second forward osmosis treatment unit receiving raw water and seawater from the first forward osmosis treatment unit, and the second forward osmosis treatment unit. An anaerobic treatment unit that receives concentrated raw water from the treatment unit and produces methane gas from the concentrated raw water, and a reverse osmosis treatment unit that receives the diluted seawater from the second forward osmosis treatment unit and separates and discharges the seawater into treated water and concentrated water. It characterized in that it includes.

Description

Water treatment system and method for reuse of sewage and seawater desalination {WATER TREATMENT SYSTEM AND METHOD FOR REUSE OF WASTE WATER AND SEAWATER DESALINATION}

The present invention relates to a water treatment system and method for sewage reuse and seawater desalination, and more particularly, by concentrating raw water to produce methane gas, and diluting the purified raw water in seawater and using it for desalination. It relates to a water treatment process system and method for sewage reuse and seawater desalination to improve the reuse rate of water.

In general, water is one of the essential factors for human survival and living. However, there is a current situation in which water is scarce not only in Korea but also in the world, and various water reuse measures have been proposed in various ways to solve the water shortage problem.

In particular, the reuse of excellence has been practiced by mankind for a very long time, and even now, it can be confirmed that some countries re-use excellence in daily life. If the collected rainwater is properly treated, it can be reused as water. However, Korea has difficulty in collecting rainwater due to the large difference in rainfall by season, so there is a lack of effective measures for rainwater.

On the other hand, in the case of islands, water shortages are remarkable and measures for smooth water supply are needed. For example, seawater desalination facilities installed in islands are small-scale facilities with a daily output of 1,000 tons or less, and most of them have a small market size.

In addition, existing desalination facilities have a negative impact on the marine environment due to water pollution and water temperature rise due to the discharge of high concentrations of concentrated water, and energy efficiency as well as simple water treatment (desalination) in areas with limited energy and water resources such as islands. There is a lack of complex treatment systems considering also.

In island regions where water resources are scarce as described above, measures for the smooth supply and operation of water are required due to its geographic characteristics. In particular, the demand for a desalination operation system that is considered complex in terms of energy and water treatment efficiency and operation in connection with other water resources is required. Alternatives are urgent.

Therefore, there is a need to improve this.

As a related background technology, there is Korean Patent Publication No. 10-1394237 (registered on May 7, 2014, name: osmotic membrane process control system and method for seawater desalination using multiple water source influent and seawater induction solution).

The present invention was created by the above necessity, and by concentrating raw water to produce methane gas, and diluting purified raw water in seawater and using it for desalination, sewage reuse and seawater to improve the reuse rate of sewage An object thereof is to provide a water treatment process system and a method for desalination.

In order to achieve the above object, the water treatment system for sewage reuse and seawater desalination according to an embodiment of the present invention provides a first forward osmosis treatment unit receiving raw water and seawater, and a first forward osmosis treatment unit supplying raw water and seawater from the first forward osmosis treatment unit. The receiving second forward osmosis treatment unit and the second forward osmosis treatment unit supplied with concentrated raw water, an anaerobic treatment unit that produces methane gas from the concentrated raw water, and the second forward osmosis treatment unit supplied with diluted seawater, and It characterized in that it comprises a reverse osmosis treatment unit that separates and discharges the treated water and concentrated water.

The second forward osmosis treatment unit receives seawater in a state immersed in the raw water, guides the purified raw water to flow into the supplied seawater, thereby concentrating the raw water, and the hollow fiber separation membrane member when the raw water is concentrated. It may be provided with a contamination cleaning and concentrating unit for concentrating the raw water so that the surface contamination layer of the separation membrane member can be washed.

The contamination washing and concentrating unit removes contaminants when contacting the surface of the hollow fiber separation membrane member, and allows the beads floating in the raw water to be condensed and decomposed so that the beads are circulated in contact with the surface of the hollow fiber separation membrane member. It includes an air injection unit for injecting air into raw water.

The beads may be prepared by mixing sodium alginate and aerobic microorganisms.

In order to achieve the above object, the water treatment method for sewage reuse and seawater desalination according to an embodiment of the present invention includes a supply step of supplying raw water and seawater, and a forward osmosis treatment by receiving raw water and seawater in the supply step. In the first forward osmosis treatment step, the second forward osmosis treatment step of receiving raw water and seawater in the first forward osmosis treatment step and the second forward osmosis treatment step, and the concentrated raw water and diluted sea water in the second forward osmosis treatment step It characterized in that it comprises a production step of producing methane gas from raw water and producing treated water from diluted seawater.

The second forward osmosis treatment step is an osmosis step in which purified raw water is introduced into seawater in a state where seawater and raw water are partitioned through a hollow fiber separation membrane member, and aerobic decomposition that aerobicly decomposes the raw water by aerobic decomposition of the raw water using beads. Includes steps.

The second forward osmosis treatment step further includes a pollutant collection step of collecting pollutants floating on the raw water supplied in the first forward osmosis treatment step.

In the production step, the raw water concentrated in the second forward osmosis treatment step is supplied, an anaerobic decomposition step of anaerobicly decomposing organic matter of the raw water to produce methane gas, and the seawater diluted in the second forward osmosis treatment step, It includes a reverse osmosis treatment step of producing treated water by reverse osmosis treatment of seawater.

The water treatment system and method for sewage reuse and seawater desalination according to the present invention have a structure in which raw water is concentrated and purified raw water is diluted in seawater to be used for desalination, thereby regenerating organic matter present in raw water. Not only can it be utilized as energy and treated water can be produced from seawater, but it also has the effect of reducing installation costs, operating costs, and land use by simplifying the pretreatment process.

In addition, the present invention is that the seawater flowing into the reverse osmosis process is diluted through two forward osmosis processes, thereby reducing energy compared to the existing reverse osmosis process, and at the same time reducing the concentration of the final outflow concentrated water to the level of seawater. As it can be maintained, the environmental load caused by the discharged concentrated water can be reduced.

1 is a process diagram showing a water treatment system for sewage reuse and seawater desalination according to an embodiment of the present invention.
2 is a flowchart of a water treatment method for reusing sewage and desalination of seawater according to an embodiment of the present invention.

Hereinafter, an embodiment of a water treatment system and method for reusing sewage and desalination of seawater according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is a process chart showing a water treatment system for sewage reuse and seawater desalination according to an embodiment of the present invention, and FIG. 2 is a flow chart of a water treatment method for sewage reuse and seawater desalination according to an embodiment of the present invention.

The water treatment system for sewage reuse and seawater desalination according to an embodiment of the present invention includes a first forward osmosis treatment unit 10, a second forward osmosis treatment unit 20, an anaerobic treatment unit 30, and It includes a reverse osmosis treatment unit 40.

The first forward osmosis treatment unit 10 receives raw water and seawater. The first forward osmosis treatment unit 10 serves to dilute the seawater by receiving raw water and seawater, respectively, to first concentrate the raw water and introduce the purified raw water into the seawater. At this time, the first forward osmosis treatment unit 10 is provided with a forward osmosis filter material 11 that receives raw water and seawater in a partitionable manner, and guides the raw water to be purified and introduced into the seawater.

The second forward osmosis treatment unit 20 receives raw water and seawater from the first forward osmosis treatment unit 10. The second forward osmosis treatment unit 20 receives raw water and seawater from the first forward osmosis treatment unit 10, and secondarily concentrates the raw water, and dilutes the seawater by introducing the purified raw water into the seawater. , A hollow fiber separation membrane member 21 and a contamination washing and concentrating unit 22.

Specifically, the hollow fiber separation membrane member 21 receives the diluted seawater from the first forward osmosis treatment unit 10 and concentrates the raw water so that the supplied seawater is diluted through an osmosis phenomenon. That is, the hollow fiber separation membrane member 21 receives seawater from the outside while submerged in the raw water, divides the raw water from the seawater, and guides the purified raw water so that it can pass through.

In addition, when the hollow fiber separation membrane member 21 concentrates the raw water, the contamination washing and concentrating unit 22 condenses the raw water so that the surface contamination layer of the hollow fiber separation membrane member 21 can be cleaned.

To this end, the contamination cleaning and concentrating unit 22 includes beads 22a and an air injection unit 22b. Here, the beads 22a are floated in the raw water so as to remove contaminants when contacting the surface of the hollow fiber separation membrane member 21 and decompose the raw water in a concentrated manner.

At this time, the beads 22a may be prepared by mixing sodium alginate and aerobic microorganisms. Accordingly, when the beads 22a are suspended in the raw water, the raw water can be concentrated by decomposing organic substances in the raw water through aerobic microorganisms.

In addition, the air injection unit 22b injects air into the raw water so that the beads 22a are circulated in contact with the surface of the hollow fiber separation membrane member 21. That is, the air injection unit 22b is installed under the second forward osmosis treatment unit 20 to inject air into the raw water to circulate the beads 22a floating in the raw water, and when the beads 22a move, the beads It serves to help (22a) to contact the outer surface of the hollow fiber separation membrane member (21).

Accordingly, when the beads 22a come into contact with the hollow fiber separation membrane member 21 in the process of being circulated in raw water through the air injection unit 22b, the contamination generated on the outer surface of the hollow fiber separation membrane member 21 by scratching Not only can the layer be removed, but also the phenomenon of sinking to the bottom of the raw water by its own weight can be prevented.

In addition, the second forward osmosis treatment unit 20 may include a skimmer 23 to remove contaminants floating from the raw water supplied from the first forward osmosis treatment unit 10. That is, the skimmer 23 is located above the second forward osmosis treatment unit 20 and serves to collect contaminants floating in the raw water by the air injection unit 22b.

On the other hand, the anaerobic treatment unit 30 receives concentrated raw water from the second forward osmosis treatment unit 20 and produces methane gas from the concentrated raw water. That is, the anaerobic treatment unit 30 decomposes the organic matter of the concentrated raw water using anaerobic microorganisms to produce methane gas, which is renewable energy, and then discharges the concentrated sludge.

Accordingly, the anaerobic treatment unit 30 can use the produced methane gas as an energy source of the water treatment system for sewage reuse and seawater desalination according to the present invention, as well as greatly reduce the discharge of concentrated sludge.

In addition, the reverse osmosis treatment unit 40 receives the diluted seawater from the second forward osmosis treatment unit 20 and separates and discharges the seawater into treated water and concentrated water. The reverse osmosis treatment unit 40 applies pressure to the seawater diluted in the second forward osmosis treatment unit 20 to separate and produce pure treated water and salty concentrated water. To this end, the reverse osmosis treatment unit 40 may be provided with a reverse osmosis filter material 41 that guides the purified concentrated water to flow into the treated water while the treated water and the concentrated water are separated so as to be separated.

The water treatment method for sewage reuse and seawater desalination according to an embodiment of the present invention is a supply step (S100), a first forward osmosis treatment step (S200), a second forward osmosis treatment step (S300) as shown in FIG. And a production step (S400).

The supply step (S100) is a process of supplying raw water and seawater to the first forward osmosis treatment step (S200).

The first forward osmosis treatment step (S200) is a process of forward osmosis treatment of the raw water and seawater supplied in the supply step (S100). The first forward osmosis treatment step (S200) serves to dilute the seawater by introducing purified raw water into the seawater and to concentrate the raw water after receiving raw water and seawater in a partitionable manner through a filter medium.

In addition, the second forward osmosis treatment step (S300) is a process of forward osmosis treatment of the raw water and seawater supplied in the first forward osmosis treatment step (S200). In this second forward osmosis treatment step (S300), raw water and seawater are supplied in the first forward osmosis treatment step (S200), and the raw water is secondarily concentrated, and the purified raw water is introduced into the seawater to dilute the seawater. do. At this time, the second forward osmosis treatment step (S300) includes an osmosis step (S310) and an aerobic decomposition step (S320).

Specifically, the osmosis step (S310) is a process of introducing purified raw water into seawater in a state where seawater and raw water are partitioned through the hollow fiber separation membrane member 21. At this time, the hollow fiber separation membrane member 21 receives seawater to the inside while the outside is submerged in the raw water, divides the raw water from the seawater, and allows the purified raw water to pass through the seawater.

In addition, the aerobic decomposition step (S320) is a process of concentrating the raw water by aerobic decomposition of organic substances in the raw water using beads 22b.

Here, the beads 22b may be prepared by mixing sodium alginate and aerobic microorganisms. Accordingly, when the beads 22a are suspended in the raw water, the raw water can be concentrated by decomposing organic substances in the raw water through aerobic microorganisms.

In addition, the beads 22b may be circulated so as to contact the surface of the hollow fiber separation membrane member 21 when air is injected into the raw water through the air injection unit 22b. Accordingly, when the beads 22a come into contact with the hollow fiber separation membrane member 21 in the process of being circulated in raw water through the air injection unit 22b, the contamination generated on the outer surface of the hollow fiber separation membrane member 21 by scratching Not only can the layer be removed, but also the phenomenon of sinking to the bottom of the raw water by its own weight can be prevented.

In addition, the second forward osmosis treatment step (S300) may further include a pollutant collection step (S330) for collecting the pollutants floating in the raw water supplied in the first forward osmosis treatment step (S200).

On the other hand, in the production step (S400), the raw water concentrated in the second forward osmosis treatment step (S300) and the diluted seawater are supplied to produce methane gas from the raw water, and the treated water is produced from the diluted seawater. To this end, in the production step (S400), the raw water concentrated in the second forward osmosis treatment step (S300) is supplied, and the anaerobic decomposition step (S410) of producing methane gas by anaerobic decomposition of the organic matter of the raw water and the second forward osmosis treatment It includes a reverse osmosis treatment step (S420) of receiving the diluted seawater in step (S300) and producing treated water by reverse osmosis treatment of the seawater.

At this time, in the anaerobic decomposition step (S410), the organic matter of the concentrated raw water is decomposed into anaerobic microorganisms to produce methane gas, which is renewable energy, and the concentrated sludge is discharged. In the reverse osmosis treatment step (S420), pressure is applied to the diluted seawater to produce pure treated water, and the concentrated water is separated and discharged at a concentration of seawater.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

10: first forward osmosis treatment unit 11: forward osmosis filter material
20: second forward osmosis treatment unit 21: hollow fiber separation membrane member
22: contamination washing and enrichment part 22a: beads
22b: air injection part 23: skimmer
30: anaerobic treatment unit 40: reverse osmosis treatment unit
41: reverse osmosis filter material

Claims (8)

A first forward osmosis treatment unit receiving raw water and seawater;
A second forward osmosis treatment unit receiving raw water and seawater from the first forward osmosis treatment unit;
An anaerobic treatment unit receiving concentrated raw water from the second forward osmosis treatment unit and producing methane gas from the concentrated raw water; And
Including; a reverse osmosis treatment unit that receives the diluted seawater from the second forward osmosis treatment unit, and separates and discharges the seawater into treated water and concentrated water,
The second forward osmosis treatment unit receives seawater in a state immersed in the raw water, guides the purified raw water to flow into the supplied seawater to concentrate the raw water, and the hollow fiber separation membrane member when the raw water is concentrated. A pollution cleaning and concentrating unit for concentrating raw water to wash the surface contaminated layer of the hollow fiber separation membrane member and a skimmer for removing contaminants floating from the raw water supplied from the first forward osmosis treatment unit,
The contamination washing and concentrating unit injects air into the raw water so that the beads floating in raw water to remove pollutants when contacting the surface of the hollow fiber separation membrane member and the beads circulate in contact with the surface of the hollow fiber separation membrane member Includes wealth,
The beads are prepared to mix sodium alginate and aerobic microorganisms to decompose organic matter when suspended in raw water to concentrate raw water,
The hollow fiber separation membrane member is a water treatment system for sewage reuse and seawater desalination, characterized in that it receives seawater from the inside in a state immersed in the raw water, divides the raw water from the seawater, and guides the purified raw water to flow into the inside.
delete delete delete A supply step of supplying raw water and seawater;
A first forward osmosis treatment step of receiving raw water and sea water in the supply step and performing forward osmosis treatment;
A second forward osmosis treatment step of receiving raw water and seawater in the first forward osmosis treatment step and performing forward osmosis treatment; And
Including; a production step of receiving the raw water concentrated in the second forward osmosis treatment step and the diluted seawater to produce methane gas from the raw water, and to produce the treated water from the diluted seawater; and
In the production step, the raw water concentrated in the second forward osmosis treatment step is supplied, an anaerobic decomposition step of anaerobicly decomposing organic matter of the raw water to produce methane gas, and the seawater diluted in the second forward osmosis treatment step, It includes a reverse osmosis treatment step of producing treated water by reverse osmosis treatment of seawater,
The second forward osmosis treatment step includes an osmosis step of introducing purified raw water into the sea water in a state where seawater and raw water are partitioned through a hollow fiber separation membrane member, an aerobic decomposition step of concentrating the raw water using beads, and the first tablet. Including a pollutant collection step of collecting pollutants floating on the raw water supplied from the osmosis treatment step,
The beads are prepared to mix sodium alginate and aerobic microorganisms to decompose organic matter when suspended in raw water to concentrate raw water,
The hollow fiber separation membrane member is a water treatment method for reuse and seawater desalination, characterized in that it receives seawater from the inside while immersed in the raw water, divides the raw water from the seawater, and guides the purified raw water to flow into the inside.
delete delete delete

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