KR101815298B1 - Reusing system of power plant wastewater using ultrasonic edr - Google Patents

Abstract

The present invention relates to a reusing system of power plant wastewater using ultrasonic EDR. According to the present invention, the reusing system of power plant wastewater using ultrasonic EDR divides concentrated water generated from a ultrafiltration (UF) device, a reverse osmosis (RO) device, and an electrodeionization (EDI) device and highly concentrated ionic wastewater generated during a recycling process of the ion exchange equipment in a manufacturing and treating process of the ultrapure water for a boiler and the cooling water for a cooling tower used for the LNG combined cycle power generation into the recycling water and wastewater by using the ultrasonic EDR, reuses the recycling water, treats and discharges the wastewater to meet the environment regulation criteria in the existing wastewater treatment device, and reuses the water in the desalination, concentration, and refinement processes, thereby minimizing the usage of water for power generation and reducing the generation amount of the wastewater. According to the present invention, the reusing system of the power plant wastewater using the ultrasonic EDR increases the return rate to 99 wt% with respect to the total weight of the used raw water by using the ultrasonic EDR in the treatment process of the water for thermal power generation (pure water and cooling water). Accordingly, the reusing system of the power plant wastewater using the ultrasonic EDR of the present invention can resolve the shortage of water for power plants, extend the life of the membrane by preventing membrane fouling due to blockage of the air holes, prevent environmental contamination by reducing the amount of wastewater generated, and improve the economic efficiency of the process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for recovering waste water using ultrasound EDR,

The present invention relates to a system for recycling power generation wastewater using ultrasonic EDR (Electrodialysis Reversal, polarity reversal electrodialysis), and more particularly, to a system for recovering UF Concentrated water generated from ultrafiltration, ultrafiltration (RO), reverse osmosis (O), and EDI (ionization) devices and high concentration ionic wastewater generated during ion exchange facility regeneration by ultrasonic EDR Water and wastewater are separated and recycled water is reused. Wastewater is discharged from the existing wastewater treatment system to the environment below the regulation value, so that water is reused in desalting, concentration and refining processes to minimize the amount of water used and to reduce the amount of wastewater And more particularly, to a power generation waste water reuse system using ultrasonic EDR.

In general, energy is indispensable for industrialization. In Korea, too, thermal power generation, hydropower generation, nuclear power generation, and wind power generation and solar power generation have been achieved in accordance with industrialization.

Korea is an export-led country, and it depends on importing most of the energy sources. The current status of power generation facilities in Korea is as shown in Table 1 below. In relation to the recent deceleration policy and fine dust generation, LNG generation, which accounts for 32.67% of the current power plant capacity as a percentage of coal power generation, It is attracting attention as a power generation facility.

division Algebra Facility Capacity (MW) Share(%)


By source



nuclear power 24 21,715.7 22.216 Coal 66 26,213.5 26.697 Domestic coal 6 1,125 1.146 Oil 236 4,255 4.333 LNG 215 32,082 32.673 Positive number 16 4,700 4.787 Renewal (including hydropower) 19,707 8,098.6 8.248 system 20,270 98,189.8 100

As can be seen from the above Table 1, it is necessary to operate the generator turbine for the thermal power generation using nuclear power, hydroelectric power, coal, oil and LNG as raw materials except for the hydroelectric power. In order to operate the generator turbine, In order to manufacture, pure water is required to be supplied to the boiler, and cooling water for cooling the equipment and lowering the water temperature is required, and the cooling water must be supplied in an amount equal to the quantity to be evaporated in the cooling tower.

Ultrapure water purified by using ion exchange facility, UF facility, RO facility, EDI facility, etc. is necessary for using tap water and ground water as raw water for manufacturing ultrapure water for supplying thermal power generation boiler and cooling water for cooling tower. For example, ultra-pure water of 10 MΩ or more is required as the supply water for the boiler. In the process of using the ultrapure water, 12 wt% of recycled water, concentrated water, etc. are generated as wastewater to the total amount of raw water consumption. In the UF and RO processes for reusing cooling water for cooling tower, 28% by weight of wastewater is generated with respect to the total weight of raw water consumption, and it was required to develop a technology capable of reducing the amount of raw water such as tap water and reducing the amount of wastewater generated by reusing wastewater generated in a power plant.

Recently, a separation membrane water treatment process capable of surely separating a target substance contained in raw water and easily performing automation and being implemented with a simple facility has been attracting attention and various applications have been applied to the entire industry as the installation or operation cost is reduced . However, in the membrane water treatment process, the concentrated water is generated at a high concentration, the treatment efficiency is lowered due to film contamination, and the cost is raised, so that the actual supply is slow.

On the other hand, the electrodialysis process is a membrane separation process for separating an ionic material by using an ion exchange membrane and an electric field formed by a DC power supplied from both ends of the electrodialysis tank as a driving force. Desalting Flectrodialysis is a desalting electrodialysis method in which, when a salt (MX) is introduced into a dilution tank, a cation (M ⁺ ) passes through a cation exchange membrane to a reducing electrode under a potential gradient and an anion (X ^- ) passes through an anion exchange membrane And the desalting process is performed by moving to the concentration tank of the dilution tank.

In such an electrodialysis process, as in the case of a conventional membrane separation process, concentration polarization and membrane contamination are caused by inorganic ions causing organic substances and sediment, and as a result, the flux is reduced, thereby obstructing establishment of efficient operation conditions have.

1. Korean Patent No. 10-1046776 "Wastewater Treatment Method Using Electrodialysis Apparatus" (Registration Date: June 29, 2011) 2. Korean Patent No. 10-1235887 entitled "Electrodialysis Apparatus and Waste Water Treatment Apparatus Using the Same" (Registered on Feb. 23, 2013).

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to solve the above problems, and it is an object of the present invention to provide a method for producing purified water and cooling water, To thereby provide a system for recycling power generation wastewater using ultrasonic EDR capable of recovering 99 wt% of wastewater to the total weight of raw water consumption and reusing it as pure water and cooling water supply water.

According to the present invention, there is provided a system for reusing power generation wastewater using ultrasonic EDR, comprising: an ultrafilter for removing fine material from tap water or ground water used as raw water; An ultrafiltration reservoir connected to the ultrafiltration unit and storing filtered water filtered by the ultrafiltration unit; A microfiltration unit connected to the ultrafiltration storage tank for secondarily removing microfilms generated or contaminated in the filtration water stored in the ultrafiltration storage tank; A reverse osmosis filter connected to the microfilter to remove ionic material of the secondarily removed microfine material from the microfilter; A reverse osmosis treatment reservoir connected to the reverse osmosis filter and storing filtered water filtered by the reverse osmosis filter; An EDI (Electrodeionization) device connected to the reverse osmosis treatment reservoir to remove ultrapure water from the treated water stored in the reverse osmosis treatment reservoir and treated with water to produce ultrapure water; An ultrapure water storage tank connected to the EDI apparatus and stored in the EDI apparatus to store ultrapure water from which trace ionic substances have been removed; A reverse osmosis filter connected to the reverse osmosis filter and the EDI device, the reverse osmosis treatment being performed in the reverse osmosis filter and storing concentrated water containing trace ionic substances processed in the EDI device; A fine concentration filter connected to the reverse osmosis treatment and the concentration tank to remove fine particles and contaminants remaining in the reverse osmosis treated water stored in the reverse osmosis treatment and concentration tank; A reverse osmosis filter connected to the fine condensation filter for removing the trace ionic substance present in the filtered water filtered through the fine condensation filter; And a reverse osmosis filter connected to the reverse osmosis filter for concentrated water treatment and the ultrafilter so as to remove contaminants used for removing contaminants adhered to the ultrafilter and reverse osmosis water used to remove contaminants adhered to the reverse osmosis filter for concentrated water treatment, An ultrapure water production processing system for supplying an LNG combined cycle power generation boiler including a wastewater treatment tank for treating wastewater with concentrated phosphorus water; And an ultrafiltration unit for removing fine contaminants in the raw water, an ultrafiltration storage unit connected to the ultrafiltration unit and storing the filtered water filtered by the ultrafiltration unit, and an ultrafiltration unit connected to the ultrafiltration storage unit, A reverse osmosis filter connected to the microfilter to remove ionic substances from the water in which the microfilm is secondarily removed from the microfilter, and a reverse osmosis filter connected to the reverse osmosis filter A reverse osmosis treatment storage tank for storing filtered water filtered by the reverse osmosis filter and a reverse osmosis filter used for removing pollutants attached to the ultrafilter and the reverse osmosis filter, NG Combined Cycle Power Plant Cooling Including Wastewater Treatment Tank Covered with Concentrated Water Including cooling water for re-processing system and; The ultrafiltration and concentrated water treatment osmosis filters of the ultrapure water production processing system for supplying the LNG combined cycle power generation boiler and the wastewater generated in the ultrafiltration and reverse osmosis filters of the cooling water reuse processing system for the LNG combined cycle power generation cooling tower are stored A wastewater mixing reservoir; A fine filter connected to the wastewater mixing tank to filter wastewater stored in the wastewater mixing tank; An ultrasonic EDR connected to the microfilter to separate the wastewater filtered by the microfilter into recycled water and concentrated water; An ultrasonic EDR processing recovery tank for recovering the recycled water separated from the ultrasonic EDR; And an ultrasonic EDR processing concentrated water storage tank for storing the concentrated water separated from the ultrasonic EDR; The wastewater generated in the ultrapure water production processing system for supplying the LNG combined cycle power generation boiler and the wastewater generated in the cooling water reuse processing system for the NG combined cycle power generation cooling tower are recycled.

In the system for recovering wastewater using ultrasonic EDR according to the present invention, the recovery rate is improved by 99% by weight with respect to the total amount of raw water consumption in the thermal power generation water (pure water, cooling water) treatment process by using the ultrasonic EDR, There is an advantage to be able to.

In addition, there is an advantage that the occurrence of membrane contamination due to clogging of membrane pores is reduced and the life of the membrane can be improved.

In addition, there is an advantage that environmental pollution can be prevented by reducing the generation amount of electric power generating wastewater, and the economical efficiency of the process can be improved.

1 is a systematic view of a process for producing ultrapure water for supplying boilers of the LNG combined cycle power plant according to the present invention.
2 is a systematic view of a process for reusing cooling water for a cooling tower of an LNG combined cycle power generation plant according to the present invention.
FIG. 3 is a flow chart of a process for recycling wastewater generated by ultrasonic EDR in the process of ultrapure water producing process for supplying LNG combined cycle power generation boiler and cooling water recycling process for cooling tower of LNG combined cycle power generation power plant.
Fig. 4 is a block diagram of the configuration of the ultrasonic EDR of Fig. 3; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system for recovering wastewater using ultrasonic EDR according to the present invention will be described in detail with reference to the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and they may vary depending on the intentions or customs of the client, the operator, the user, and the like. Therefore, the definition should be based on the contents throughout this specification.

Like numbers refer to like elements throughout the drawings.

2 is a schematic diagram of a process for reusing cooling water for a cooling tower of an LNG combined cycle power plant according to the present invention, and Fig. 3 is a flow chart of a process of producing ultra pure water for supplying LNG combined cycle power plant FIG. 4 is a block diagram of the ultrasonic EDR of FIG. 3; FIG. 4 is a block diagram of a process of recycling wastewater generated in the ultra pure water production process for supplying boiler and the cooling water recycling process for cooling tower for cooling tower of LNG combined cycle power generation by using ultrasonic EDR.

Now, referring to FIGS. 1 to 4, a system for recycling power generation wastewater using ultrasonic EDR (polarity reversing electrodialysis) according to the present invention will be described.

1, the ultrapure water production system 100 for supplying LNG combined cycle power generation boiler includes an ultrafilter 110 for removing fine material from tap water or ground water used as raw water, and an ultrafilter 110 connected to the ultrafilter 110 An ultrafiltration storage tank 120 for storing filtered water filtered by the ultrafiltration filter 110 and an ultrafiltration storage tank 120 connected to the ultrafiltration storage tank 120 to store fine materials generated or contaminated in the filtered water stored in the ultrafiltration storage tank 120, A reverse osmosis filter (140) connected to the precision filter (130) for removing ionic substances of the water from which the fine material is secondarily removed by the fine filter (130), and a reverse osmosis filter A reverse osmosis treatment storage tank 150 connected to the reverse osmosis treatment storage tank 150 for storing the filtered water filtered by the reverse osmosis filter 140 and connected to the reverse osmosis treatment storage tank 150, Ezer (EDI) device 160 for removing ultrapure water from the treated water by treatment with reverse osmosis and treated water, and an EDI device 160 connected to the EDI device 160 and treated in the EDI device 160, And an ultrapure water storage tank 170 for storing ultrapure water from which the material has been removed.

The reverse osmosis filtration unit 140 and the EDI unit 160 are connected to the reverse osmosis filter 140 and the concentrated water containing the trace ionic substance processed in the EDI unit 160 is treated with reverse osmosis 180 and connected to the reverse osmosis treatment and concentration tank 180 to remove the fine substances and contaminants remaining in the reverse osmosis treated water stored in the reverse osmosis and concentration tank 180 through the fine concentration filter 190 And filtered through a reverse osmosis filter 195 for concentrated water treatment to remove the trace ionic substances present in the concentrated water.

Here, the concentrated water, which is filtered through the reverse osmosis filter 195 for concentrated water treatment to remove the trace ionic material, is recovered to 75% by weight of the total weight of the concentrated water and sent to the ultrafiltration storage tank 120 for recycling.

The reverse osmosis filter 195 and the ultrafilter 110 are connected to the ultrafilter 110 to remove pollutants adhered to the ultrafilter 110 and to the reverse osmosis filter for concentrated water treatment 195) is sent to the wastewater treatment tank (196) for wastewater treatment in an amount of 25% by weight based on the total weight of the concentrated water.

In addition, the reverse osmosis treated water stored in the reverse osmosis treatment reservoir 150 has an electrical conductivity of about 10 to 20 μs / cm. The electrical conductivity of the water is about 10 MΩ / cm through the EDI device 160, Or more.

2, the cooling water recycling system 200 for lowering the temperature of the water used as the cooling water for the cooling tower of the LNG combined cycle power generation cooling plant and for removing contaminant contaminants during the cooling process is used as the cooling water for the cooling tower of the LNG combined- An ultrafiltration unit 210 for removing fine contaminants in the raw water and an ultrafiltration storage unit 220 connected to the ultrafiltration unit 210 to store filtered water filtered by the ultrafiltration unit 210, A microfilter 230 connected to the storage tank 220 to remove microfilms generated or contaminated in the filtered water stored in the ultrafiltration storage tank 220 and a microfilter 230 connected to the microfilter 230, The reverse osmosis filter 240 is connected to the reverse osmosis filter 240 so as to remove the filtered water from the reverse osmosis filter 240, A cooling water reverse osmosis treatment reservoir 250 for storing the ozone water for use as an ozone generator and a reverse osmosis filter 240 connected to the ultrafilter 210 and the reverse osmosis filter 240 to remove contaminants adhered to the ultrafilter 210 And a wastewater treatment tank 196 for wastewater treatment of the concentrated water generated during the treatment in the reverse osmosis filter 240.

Water having passed through the reverse osmosis filter 240 and having an electric conductivity of 20 to 30 μs / cm 2 is sent to the ultrafilter 210 to be recycled as cooling water.

3 and 4, there is shown an ultrasonic EDR generation wastewater reuse system 300 according to the present invention and an ultrasonic EDR 330 used in the ultrasonic EDR generation wastewater reuse system 300. In the present invention, The ultrasound EDR generation wastewater reuse system 300 according to the present invention includes the ultrafilter 110 and the concentrated water treatment reverse osmosis filter 195 of the ultrapure water production system 100 for supplying the LNG combined cycle power generation boiler of FIG. A waste water mixing and storing tank 301 for storing wastewater generated in the ultrafilter 210 and the reverse osmosis filter 240 of the cooling water reuse processing system 200 for the LNG combined cycle power generation cooling tower, A fine filter 320 connected to the waste water mixed storage tank 301 for filtering wastewater stored in the waste water mixed storage tank 301 and connected to the fine filter 320 so as to circulate the wastewater filtered by the fine filter 320 to the recycled water and the concentrated water Ultrasonic EDR for separation ( And an ultrasonic EDR processing recovery tank 340 for recovering the recycled water separated from the ultrasonic EDR 330 and an ultrasonic EDR processing concentrated water storage tank 340 for storing the concentrated water separated from the ultrasonic EDR 330. [ (350).

A first pipe 302 is connected between the wastewater mixing reservoir 301 and the microfilter 320 and a second pipe 325 is connected between the microfilter 320 and the EDR 330 A third pipe 337 is connected between the ultrasonic EDR 330 and the ultrasonic EDR processing reservoir 340 and between the ultrasonic EDR processing reservoir 350 and the ultrasonic EDR 330, And a fourth pipe 338 is connected.

In addition, the wastewater stored in the wastewater mixing reservoir 301 is stirred and homogenized by an agitator (not shown).

The first pipe 302 is provided with a wastewater control valve 303 for controlling the discharge of the wastewater homogenized in the wastewater mixing storage tank 301 and a wastewater control valve 303 for controlling the discharge by the wastewater control valve 303, A waste water supply pump 310 for supplying the wastewater discharged through the first pipe 302 to the waste water supply pump 310 for discharging the wastewater discharged through the first pipe 302, And a pressure gauge 312 for measuring the pressure of the wastewater whose discharge is controlled by the wastewater control valve 303 and discharged through the first pipe 302 is mounted.

The second pipe 325 is provided with a pressure gage 321 for measuring the pressure of the filtered water filtered by the microfilter 320 and discharged through the second pipe 320, A filtration water control valve 323 for controlling the discharge of the filtrate water through the second pipe 320 and a filtration water control valve 323 for controlling the filtration water control valve 323, And an electric conductivity meter 324 for measuring the electric conductivity of the filtered water whose discharge is controlled through the electrolytic water meter 324.

The third pipe 337 is provided with a discharge control valve 331 for performing ultrasonic EDR processing in the ultrasonic EDR 330 and regulating the discharge of the recycled water through the third pipe 337, A flow meter 332 for measuring the flow rate of the recycled water discharged through the third pipe 337 by regulating the discharge through the discharge control valve 331 and the discharge control valve 331, An electric conductivity meter 333 for measuring the electric conductivity of the recycled water discharged through the pipe 337 is mounted.

The fourth pipe 338 is connected to an ultrasonic EDR process concentration water control valve (not shown) for controlling the discharge of the ultrasonic EDR process concentrated water through the fourth pipe 338, A flow meter 335 for measuring the flow rate of the ultrasonic EDR treatment concentrated water discharged through the fourth piping 338 by controlling the discharge through the ultrasonic EDR treatment concentrated water control valve 334, An electric conductivity meter 336 for measuring the electric conductivity of the ultrasonic EDR-treated concentrated water discharged through the fourth piping 338 and controlled to be discharged through the ultrasonic EDR treatment concentrated water control valve 334 is mounted.

Also, the recycled water recovered in the ultrasonic EDR processing recovery tank 340 through the ultrasonic EDR 330 is 95% by weight or more based on the total weight of the raw water.

Now, an ultrasonic EDR 330 according to the present invention will be described with reference to FIG.

The ultrasonic EDR 330 includes an ultrasonic generator 330-11 for generating ultrasonic waves, and a cathode exchange membrane (not shown) using ions injected into the filtered water filtered by the microfilter 320, And an anion exchange membrane (not shown), and a water quality sensor (not shown) for measuring the quality of the filtered water passed through the electrodialyser 330-3 And a control unit 330-7 for controlling the ultrasonic generator 330-1, the electrodialyser 330-3 and the water quality sensor 330-5.

Here, shock waves generated by the ultrasonic wave generated by the ultrasonic wave generator 330-1 and transmitted to the filtered water and generated by the explosion of the air bubbles are transmitted to the cation exchange membrane and the anion exchange membrane of the electrodialyser 330-3, And separating and removing the contaminants or ionic substances from the anion exchange membrane by inhibiting the phenomenon that the pores of the cation exchange membrane and the anion exchange membrane are clogged by organic matter or inorganic precipitation.

Tap water or ground water is supplied to the ultrafilter 110 as raw water used for the boiler feed ultrapure water production process according to the present invention. The ultrafilter 110 has pores of 0.02 to 0.05 탆 and the ultrafilter 110 The passed water can minimize the membrane contamination of the reverse osmosis filter 140 at the rear end of the ultrafilter 110 because the SDI (Silt Density Index) is 3 or less. If the pores of the ultrafilter 110 are less than 0.02 m, the pores are too small to be easily clogged. If the pores of the ultrafilter 110 exceed 0.05 m, contaminants may pass through the water temperature and metal ions . If the SDI of the water passing through the ultrafilter 110 exceeds 3, the contamination of the reverse osmosis filter 140 at the rear end of the ultrafilter 110 is not minimized.

Since the ultrafilter 110 is operated as a hollow fiber pre-filtration system and the backwash water is generated during the backwashing process, the efficiency of the recycled water treatment is 95% by weight or less based on the total weight of the raw water in the example of 500 MW LNG combined- Respectively.

division A B C D E F G H flux M3 / d 549 549 624 624 528 528 480 48 TDS mg / L 121 121 108 108 1,670 1,670 0.1 17,370 division I J K L M N O flux M3 / d 27 27 96 144 144 108 36 TDS mg / L 121 121 775 523 523 11,200 2,065

 Standard: 500MW LNG combined cycle power plant

In addition, the raw water used in the cooling water recycling process according to the present invention passes through the ultrafilter 210 in order to remove pollutants such as water temperature and metal ions contained in the power generation cooling water, 210) is 0.01 to 0.05 mu m. If the pores of the ultrafilter 210 are less than 0.01 μm, the pores are too small to be easily clogged. If the pores of the ultrafilter 210 exceed 0.05 μm, the contaminants may pass through the water temperature and metal ions .

The ultrafilter 210 is operated as a hollow fiber pre-filtration system. In the backwash process, about 5% by weight of backwash is generated with respect to the total weight of the raw water. Thus, as shown in Table 3, 95% by weight. The filtered water passed through the ultrafilter 210 can minimize the film contamination of the reverse osmosis filter 240 at the rear end of the ultrafilter 210 with an SDI of 3 or less. If the SDI of the water passing through the ultrafilter 210 exceeds 3, the contamination of the reverse osmosis filter 240 at the rear end of the ultrafilter 210 is not minimized.

division a b c d e f g h i j flux M3 / d 1,440 1,440 1,368 1,368 1,026 1,026 342 72 72 414 TDS mg / L 657 657 657 657 21 2,610 657 657 657 2,270

Standard: 500MW LNG combined cycle power plant

As shown in the above Tables 2 and 3, the recovery rate of the LNG combined-cycle power plant was 88.5% in the process of producing ultrapure water for boiler feed, 63 tons / day of water was discharged to the wastewater treatment plant, In the cooling water production process, the recovery rate is 71% and the amount of water discharged to the wastewater treatment plant is 414 tons / day.

In the present invention, water is not sent to a wastewater treatment plant in the process of producing cooling water for ultrapure water and cooling tower, and the recovery rate is maximized as seen from one place to minimize the amount of water to be disposed of in the wastewater treatment plant. It is possible to predict the quality of water as shown in Table 4 and to use it for recovery.

division J O i g j ① ② ③ ④ ⑤ ⑥ flux M3 / d 27 36 72 342 414 477 477 454 24 454 24 TDS mg / L 121 3,065 657 21 227 2,205 2,205 13 45,540 13 45,540

Standard: 500MW LNG combined cycle power plant

As shown in Table 4 and FIG. 3, when the waste water is mixed with the waste water in the ultrapure water production process and the cooling water recycling process, the TDS is about 2,200 ppm and the salinity is somewhat higher than the sea water (TDS 40,000 ppm) Can be used.

The ultrasonic EDR 330 according to the present invention is configured such that the anode (+) and cathode (-) plates are exchanged from time to time and the ultrasonic generator 330-1 is installed, By suppressing the occurrence of membrane fouling, it is possible to operate without membrane fouling for a long period of time, as well as to remove high concentration of ionic components contained in the raw water and recover it as water quality that can be reused as power plant water.

The treated water having passed through the ultrasonic EDR 330 has a recovery rate of 95% by weight or more based on the total weight of the raw water and a total dissolved solids (TDS) of 13 ppm or less even in the quality of water.

Meanwhile, the TDS component of the concentrated water that has passed through the ultrasonic EDR 330 is about 45,000 ppm, and the amount of the generated TDS is 5% by weight or less with respect to the total weight of the raw water, and only the concentrated water is treated in the wastewater treatment plant. If the ultrasonic EDR 330 is used for treatment of water for generating electric water, the total recovery rate can be increased from 76% by weight to 99% by weight with respect to the total weight of the raw water.

As described above, the system for recovering wastewater using ultrasonic EDR according to the present invention improves the recovery rate to 99% by weight with respect to the total amount of raw water consumption in the thermal power generation water (pure water, cooling water) treatment process by using the ultrasonic EDR, It is possible to solve the problem of lack of water, to reduce the occurrence of membrane contamination due to clogging of membrane pores, to improve the lifetime of the membrane, to reduce the generation amount of power generation wastewater, to prevent environmental pollution, Can be improved.

Although the present embodiment of the present invention is applied to a LNG combined cycle power generation system using a power generation wastewater recycling system using ultrasonic EDR, it is not limited thereto and can be applied throughout the entire thermal power generation

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various changes, modifications or adjustments to the example will be possible. Therefore, the scope of protection of the present invention should be construed as including all changes, modifications, and adjustments that fall within the spirit of the technical idea of the present invention.

100: ultrapure water production processing system 110, 210: ultrafiltration
120, 220: ultrafiltration storage tank 130, 230: precision filter
140, 240: reverse osmosis filter 150: reverse osmosis treatment storage tank
160: EDI device 170: ultrapure water storage tank
180: reverse osmosis and concentration tank 190: precision concentration filter
195: Reverse Osmosis Filter for Concentrated Water Treatment
196: wastewater treatment tank 200: cooling water reuse treatment system
250: Cooling water reverse osmosis treatment storage tank 300: Ultrasonic EDR generation wastewater reuse system
301: waste water mixing tank 302: first piping
310: waste water supply pump 311, 332, 335: flow meter
312, 321: pressure gauge 320: ultrasonic EDR precision filter
322: Thermometer 323: Filtration water control valve
324, 333, 336: electric conductivity meter 330: ultrasonic EDR
330-1: Ultrasonic generator 330-3: Electrodialysis unit
330-5: Water quality measuring sensor 330-7:
331: Discharge control valve 334: Ultrasonic EDR treatment concentrated water control valve
340: Ultrasonic EDR treatment collection tank 350: Ultrasonic EDR treatment concentrated water storage tank

Claims (5)

An ultrafilter 110 for removing fine material from tap water or ground water used as raw water; An ultrafiltration storage unit 120 connected to the ultrafiltration unit 110 to store filtered water filtered by the ultrafiltration unit 110; A microfilter (130) connected to the ultrafiltration storage tank (120) and secondarily removing microfilm generated or contaminated in the filtration water stored in the ultrafiltration storage tank (120); A reverse osmosis filter (140) connected to the microfilter (130) and removing ionic substances of water that is secondarily removed from the microfilm in the microfilter (130); A reverse osmosis treatment reservoir 150 connected to the reverse osmosis filter 140 to store filtered water filtered by the reverse osmosis filter 140; An EDI (Electrodeionization) unit 160 connected to the reverse osmosis treatment reservoir 150 for removing the trace ionic substances from the reverse osmosis treated water stored in the reverse osmosis treatment reservoir 150 to produce ultrapure water; An ultrapure water storage tank 170 connected to the EDI apparatus 160 and storing ultrapure water processed by the EDI apparatus 160 to remove trace ionic substances; The reverse osmosis filter 140 is connected to the EDI device 160 and is filtered by the reverse osmosis filter 140 and the concentrated water containing the trace ionic substance processed by the EDI device 160 is stored. 180); A fine concentration filter 190 connected to the reverse osmosis and concentration tank 180 for removing the fine particles and contaminants remaining in the reverse osmosis treated water stored in the reverse osmosis and concentration tank 180; A reverse osmosis filter 195 connected to the fine condensation filter 190 for removing the trace ionic substances present in the filtered water filtered through the fine condensation filter 190; And a reverse osmosis membrane 195 connected to the concentrated water treatment reverse osmosis filter 195 and the ultrafilter 110 to remove contaminants adhered to the ultrafilter 110 and the concentrated water treatment reverse osmosis filter 195, And a wastewater treatment tank (196) for wastewater treatment of the concentrated water used to remove contaminants adhered to the LNG combined cycle power generation boiler (100); And
An ultrafilter 210 for removing fine contaminants in the raw water and an ultrafiltration storage 220 connected to the ultrafiltration 210 for storing filtered water filtered by the ultrafiltration 210, The microfilter 230 is connected to the ultrafilter 220 and removes microfilms generated or contaminated in the filtration water. The microfilter 230 is connected to the microfilter 230, A reverse osmosis filter 240 for removing ionic substances from the water in which the fine material is secondarily removed in the reverse osmosis filter 240 and a reverse osmosis treatment cooling water for storing filtered water filtered in the reverse osmosis filter 240, And a reverse osmosis filter 240 connected to the ultrafilter 210 and the reverse osmosis filter 240 to remove contaminants adhered to the ultrafilter 210 and the reverse osmosis filter 240, Nitrogen generated during processing A cooling water reuse processing system (200) for an LNG combined-cycle thermal power generation cooling tower including a wastewater treatment tank (196) for treating wastewater;
The ultrafilter 110 and the concentrated water treatment reverse osmosis filter 195 of the ultrapure water producing and processing system 100 for supplying the LNG combined cycle power generation boiler and the ultrafilter 200 of the cooling water reuse processing system 200 for the LNG combined- A waste water mixing tank 301 for storing wastewater generated in the reverse osmosis filter 210 and the reverse osmosis filter 240;
A fine filter (320) connected to the wastewater mixing reservoir (301) to filter wastewater stored in the wastewater mixing reservoir (301);
An ultrasonic EDR 330 connected to the microfilter 320 for separating the wastewater filtered by the microfilter 320 into recycled water and concentrated water;
An ultrasonic EDR processing recovery tank 340 for recovering recycled water separated from the ultrasonic EDR 330; And
And an ultrasonic EDR processing concentrated water storage tank (350) for storing the concentrated water separated from the ultrasonic EDR (330);
The wastewater generated in the ultrapure water production processing system 100 for supplying the LNG combined cycle power generation boiler and the wastewater generated in the cooling water reuse processing system 200 for the LNG combined power generation power generation cooling tower are recycled. Power generation wastewater reuse system.
The method according to claim 1,
The ultrasonic EDR (330)
An ultrasonic generator 330-1 for generating ultrasonic waves;
An electrodialyzer 330-3 equipped with a membrane for separating and concentrating ionized ions filtered by the microfilter 320 using a DC current as a driving force,
A water quality sensor 330-5 for measuring the water quality of the filtered water passed through the electrodialyser 330-3; And
A controller 330-7 for controlling the ultrasonic generator 330-1, the electrodialyzer 330-3, and the water quality sensor 330-5;
And the pores of the membrane attached to the electrodialyser 330-3 are prevented from being clogged by the ultrasonic waves generated by the ultrasonic generator 330-1 so that the membrane contamination is suppressed. Reuse system.
The method according to claim 1,
The concentrated water that has been filtered through the reverse osmosis filtration water treatment 195 to remove the trace ionic material is recovered and sent to the ultrafiltration storage tank 120 to be recycled.
The filtered water passed through the reverse osmosis filter (240) is sent to the ultrafilter (210) and recycled as cooling water.
The method according to claim 1,
Wherein the pore of the ultrafilter (110) is 0.02 to 0.05 탆, and the ultrafiltration water (110) has a SDI (Silt Density Index) of 3 or less.
The method according to claim 1,
Wherein the pore of the ultrafilter 210 is 0.01 to 0.05 mu m and the water having passed through the ultrafilter 210 has an SDI of 3 or less.

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