KR20140094895A - system and method for recycling steelwastewater - Google Patents

Abstract

The present invention relates to a treatment system and a treatment method for recycling steel wastewater. More particularly, the present invention relates to a treatment method for recycling steel wastewater, comprising the steps of: lowering the pH of the steel wastewater by introducing the steel wastewater into a pH adjustment part; filtering the wastewater, which has been discharged from the pH adjustment part, by introducing the wastewater into a membrane filtration part; generating final process water by introducing the wastewater, which has been filtered by the membrane filtration part, into an RO filtration part; introducing concentrate into a concentrate treatment part via the RO filtration part, and discharging RO produced water for recycling; and evaporating the concentrate, which has been introduced into the concentrate treatment part, to combine the obtained steam with the produced water of the RO filtration part again.

Description

TECHNICAL FIELD The present invention relates to a process and a treatment system for recycling steel wastewater,

The present invention relates to a treatment method and a treatment system for reusing iron wastewater. More specifically, filtration of filtrate, pH adjustment, UF, membrane filtration through MF membranes, filtration of iron wastewater, filtration of RO filtration and re-use of 70% To an HMVR evaporator, which is a hybrid high-efficiency concentrated water recovery system capable of reducing the amount of wastewater reclaimed by a wastewater treatment plant.

The steel industry is one of the industries that use a lot of water, and many steel wastewater is generated. In order to remove impurities from steel wastewater, a coagulation sedimentation method is mainly used. Conventional coagulation sedimentation method is a very important process during water treatment process by forming coarse flocs by using chemicals such as coagulant to precipitate fine particles present in water and precipitating them by natural sedimentation method in a sedimentation tank . Conventional flocculation method is the most widely used process in water treatment process due to its stable technology and low cost of treatment. However, since the fine particles have a slow natural sedimentation velocity, a very large sedimentation tank is required because of the long hydraulic retention time (HRT) required to precipitate agglomerated flocs.

Further, since chemicals are used, there is a problem that the amount of sludge generated is large and reuse is difficult. Therefore, there is a need for a new concept of solid-liquid separation technology capable of removing suspended solids at a high speed without using chemicals such as coagulant, as a method for removing suspended solids in steel wastewater.

As such solid-liquid separation techniques, there are known techniques for treating suspended matters of wastewater using magnets, and representative examples thereof are disclosed in Korean Patent Publication Nos. 1984-2329 and 1986-1763.

Korean Patent Laid-Open Publication No. 1984-2329 relates to a method and apparatus for separating suspended solids in wastewater. This separating apparatus is composed of two inner and outer baths and a magnet is attached to the bottom of the outer bath. The mixture is introduced into the inner tank, and the potato component with the suspension is settled while being adsorbed by the magnet and the supernatant is waterproofed.

However, this apparatus uses the sedimentation tank for sedimenting the potato component body with the suspension as it is, so there is a limit in reducing the facility size and processing time. Korean Patent Laid-Open Publication No. 1986-1763 relates to a method of treating wastewater using a magnetic field. This method forms a strong magnetic field by a permanent magnet or an electromagnet in a wastewater inflow passage associated with a settling tank, passes the wastewater into a magnetic field, Processing technology. However, this wastewater treatment method has a problem that the residence time is long in order to deposit the suspended matter passing through the wastewater inflow passage in the settling tank.

Further, in the conventionally disclosed Japanese Patent Registration No. 0492934, a wastewater treatment apparatus and a treatment method thereof for removing suspended solids of steel wastewater are described. Such wastewater treatment apparatus includes a raw wastewater reservoir configured to store iron wastewater,

And at least one pillar-shaped filler is disposed inside the pillar, and at least one pillar of the steel wastewater, which is connected to the raw wastewater storage tank in a waste water communication relation, Wherein at least one of the magnetic separation tanks is provided with a cleaning nozzle at an upper portion of the pillar, a pipe connected to the upper portion of the magnetic separation tank in a process and hydraulically connected relationship, and a supply pipe for supplying cleaning water to the nozzles of the magnetic separation tank, And a washing water storage tank connected to the lower portion of the magnetic separating tank in a washing water communication relation and passing wash water sprayed from the nozzle through the filler to enter the washing water storage tank. In addition, Japanese Patent No. 0492934 describes a method for removing scum by using this apparatus.

Such a wastewater treatment apparatus can shorten the treatment time of the iron wastewater containing magnetic substance from 4 hours to 30 minutes to about 22 minutes. Since the precipitation tank is not used, the facility scale can be reduced to 1/10 or less and the coagulant- It is described that there is a useful effect of reducing the amount of sludge generated since it is not used.

In addition, a conventionally disclosed Registration Utility Model No. 0458955 relates to a scale-pit separating plant for scaling pits of a steel mill, comprising a scale pit in which waste oil and waste water are mixed and a pump for pumping waste water stored in a lower portion of the scale pit, And a wastewater separating tank for collecting the wastewater pumped from the pump and separating the wastewater from the waste oil; Wherein the intermediate wastewater separator comprises an intermediate separation wastewater portion for collecting intermediate wastewater mixed with waste oil with an intermediate wall therebetween and a net wastewater portion for collecting net wastewater by filtering intermediate wastewater of the intermediate wastewater portion, And a scale filter for collecting net wastewater in the net wastewater portion by filtering the included scale. According to such a configuration, waste water in the scale pit is separated to reduce the waste oil treatment cost of the scale pit, and the separated waste water can be effectively treated through the waste water treatment plant.

Such conventional iron wastewater treatment methods and systems focus only on efficient separation of iron wastewater, removal of scale, and reduction of sludge generation. Therefore, by reusing such steel wastewater and reducing the pH value, the scale formed on the surface of the membrane can be minimized, chemical agents for cleaning can be efficiently introduced, RO concentration can be increased, A treatment method and a treatment system for reusing iron wastewater that can increase the recovery efficiency of the whole wastewater by increasing the efficiency of the wastewater.

Korean Patent No. 0492934 Korea Registered Utility Model No. 0458955

According to an embodiment of the present invention, there is provided a membrane filtration unit including a filtration filter unit, a pH adjuster, a UF membrane or an MF membrane, an RO filtration unit, an HMVR evaporator, and the like, 70% is recycled as process water in the RO process combined with the membrane separation process of UF and MF by treating the steel wastewater and 90% or more of the remaining 30% is discharged from the river or the ocean to prevent the discharge of high concentration wastewater. The HMVR evaporator, which is a hybrid high-efficiency concentrated water treatment system capable of recovering water, is introduced and the treated water generated through the concentrated water treatment process is merged with the production water of the RO filtration unit, so that the total amount of washing water can be reused, A treatment method for reusing steel wastewater that can reduce the use of a cleaning liquid because the cleaning period based on the pH value can be lengthened, And to provide a system for that purpose.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

A first object of the present invention is to provide a treatment method for reusing iron wastewater, comprising the steps of: filtering wastewater flowing into a filtration filter portion to remove particles having a specific diameter or more from wastewater; Filtering the wastewater into the pH adjusting unit to lower the pH value of the wastewater; the wastewater discharged from the pH adjusting unit flows into the membrane filtration unit to perform membrane filtration; Filtering the wastewater through the membrane filtration unit into the RO filtration unit to produce industrial water and separate into concentrated water; The residual pressure of the RO concentrated water is transferred to the influent water through PRD (pressure transducer), and the RO filtered water is transferred to the process water for reuse; The concentrated water passing through the PRD (pressure transducer) is introduced into the evaporator of the HMVR; And the concentrated water flowing into the HMVR evaporator is evaporated, and the distilled water generated by the evaporation treatment is merged with the product water of the RO filtration unit through the MD (membrane distillation) filtration unit. As shown in FIG.

In the step of lowering the pH of the wastewater, the pH of the wastewater flowing into the pH adjusting unit is varied from 8 to 11, and the pH of the wastewater discharged from the pH adjusting unit is 5.5 to 7.5.

and the pH adjusting unit adjusts the pH value using inorganic acid.

The step of introducing into the membrane filtration section and filtering may be performed using at least one of a UF filter and an MF filter.

In the step of filtering the RO and entering the RO filtration unit and reused as industrial water, production water is discharged using an RO filter.

The step of separating into the treated water and the concentrated water through the RO filtration includes the step of injecting the chemical cleaning liquid and the anti-scale agent into the membrane filtration unit and the RO filtration unit by the introducing means every predetermined period.

In the feeding step, 60 to 80% of the filtered water to be discharged is recovered and transferred to the process water,

And the remaining 20 to 40% is introduced into the HMVR together with the residual pressure passing through the pressure transducer (PRD) as concentrated water.

The input control unit controls the input means based on the pH value of the wastewater discharged from the pH adjusting unit to adjust the cleaning liquid to be supplied to the RO filtration unit.

In the step of joining with the production water of the RO filtration part, the concentrated water treatment part is composed of the MD and the HMVR of the heat exchange evaporator.

The HMVR evaporator converts 90 to 97% of the concentrated water to distilled water, and the water produced through the MD filtration unit is merged with the water produced by the RO filtration unit.

The concentrated water being stored in an evaporation tank; The concentrated water stored in the evaporation tank is supplied with a heat source and evaporated; The evaporated water vapor is discharged through the MD filtration unit; And a step in which water vapor exceeding 100 flows through a heat exchange tube provided in the evaporation tank and is heat-exchanged, and the heat source is supplied by the steam of 100 flowing through the heat exchange tube.

A second object of the present invention is to provide a filtration filter unit for filtering wastewater into wastewater, A pH adjusting unit for lowering the pH of the wastewater into which the steel wastewater filtered by the filtration filter unit flows; a membrane filtration unit for introducing wastewater discharged from the pH adjustment unit to filter wastewater; An RO filtering unit for filtering the filtered wastewater through the membrane filtration unit to produce final process water; And a concentrated water treatment unit for introducing the concentrated water generated by the RO filtration unit and distilled water generated by the evaporation treatment by heat exchange to the produced water of the RO filtration unit through the MD membrane filtration unit. Can be achieved as a processing system for reuse.

The membrane filtration unit may include at least one of a UF filter and an MF filter.

And a cleaning liquid injecting means for injecting the anti-scale agent stored in the cleaning liquid tank into the RO filtration section.

and a control unit for controlling the flow rate of the cleaning liquid to be supplied to the RO filtration unit by controlling the cleaning liquid input means based on the pH value of the wastewater discharged from the pH adjustment unit.

And the concentrated water treatment section is composed of a heat exchange evaporator and an MD of HMVR which is a hybrid high-efficiency concentrated water treatment system.

The HMVR comprises: a evaporation tank in which concentrated water is stored; The condensed water stored in the evaporation tank is evaporated, and the formed water vapor is introduced to perform additional filtration and evaporation through the MD filtration membrane; And a heat exchanger tube for supplying the heat source to the concentrated water stored in the evaporation tank, wherein the water vapor of 100 discharged into the heat exchanger in the evaporation tank is introduced again.

A third object of the present invention can be achieved as a recording medium on which a program code for executing a processing method for reusing steel wastewater according to the above-mentioned first object which can be read by a computer is recorded.

As described above, according to the embodiment of the present invention, the steel wastewater is filtered through a filtration filter unit, a pH adjustment unit, a membrane filtration unit composed of a UF membrane and an MF membrane, an RO filtration unit and an HMVR, HMVR, a high-efficiency concentrated water treatment system capable of recovering up to 90% of the effluent, is not introduced into the river or ocean, and the distilled water produced through the concentrated water treatment process is used for MD filtration The filtrate is evaporated through the filtration, and the concentrated filtrate is filtered through the RO filtration unit. Thus, the entire amount of the steel wastewater can be reused, and the pH adjustment unit is provided. As a result, And the cleaning cycle based on the characteristics can be lengthened.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be appreciated by those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention, All fall within the scope of the appended claims.

1 is a flow chart of a treatment method for reusing iron wastewater according to an embodiment of the present invention,
2 is a block diagram showing the configuration of a treatment system for reusing iron wastewater according to an embodiment of the present invention.
3 is a block diagram of an HMVR according to an embodiment of the present invention.
FIG. 4 is a block diagram illustrating the principle of HMVR according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, a treatment system 100 for reusing iron wastewater according to an embodiment of the present invention and a treatment method using the treatment system 100 will be described. First, FIG. 1 shows a flowchart of a treatment method for reusing iron wastewater according to an embodiment of the present invention. 2 is a block diagram showing the construction of a processing system 100 for reusing iron wastewater according to an embodiment of the present invention.

As shown in FIG. 2, the treatment system 100 for recycling iron wastewater according to an embodiment of the present invention generally includes a filtration filter unit 10 that filters wastewater into wastewater, ; A pH adjusting unit 20 for introducing the filtered wastewater filtered by the filtration filter unit 10 to lower the pH of the wastewater; a membrane filtration unit 30 for introducing wastewater discharged from the pH adjustment unit 20 to filter wastewater; An RO filtration unit 40 through which filtered wastewater flows through the membrane filtration unit 30 to produce final process water; And a concentrated water treatment system in which the concentrated water generated in the RO filtration unit 40 flows into the RO filtration unit 40 and the distilled water generated by the evaporation treatment is circulated again.

First, the steel wastewater discharged from the steelmaking process flows into the filtration filter unit 10, and the filtration filter unit 10 filters the particles of the wastewater having a specific diameter or more (S1). In the specific embodiment, the particles having a particle size of 20 mu m or more are filtered by the filtration filter unit 10. [

The wastewater filtered by the filtration filter unit 10 flows into the pH adjustment unit 20. The pH adjusting unit 20 functions to lower the acidity of the introduced high pH wastewater (S2). Specifically, the pH of the wastewater flowing into the pH adjusting unit 20 is about 8 to 11, and the pH adjusting unit 20 adjusts the pH value to 5.5 to 7.5. The pH adjustment condition is adjusted so that the acidity of the wastewater is 5.5 to 7.5 pH (preferably 6.5 pH) by using an inorganic acid such as H2SO4 or HCl.

The pH adjustment unit 20 discharges the low pH wastewater, and the discharged wastewater flows into the membrane filtration unit 30 and is filtered through the membrane filtration unit 30 (S3). The membrane filtration unit 30 according to an exemplary embodiment of the present invention may include a UF filter, an MF filter, or the like.

The UF filter operating condition according to an embodiment of the present invention is one cycle of 30 minutes of operation, 60 seconds of back washing and 55 seconds of flushing, and is operated so as to minimize the step-by-step interference by setting drain and allowance time for each step. At the time of backwashing, 12.0 Nm ³ / h of air is blown to remove particulate film contaminants from the film surface, and 80 ppm of NaOCl is simultaneously injected to reduce film contamination by organic substances.

And periodically performs CEB (Chemical Enhanced Backwash). If it is not possible to recover from CEB, CIP (Chean in Place) will be performed. In case of CEB, 0.6 ~ 0.7atm is exceeded, the chemicals to be injected are carried out in T.B.W and B.B.W for 30sec each of NaOCl (750ppm), NaOH (650ppm) and HCl (400ppm). The CIP was backwashed with NaOCl (0.3%) and NaOH (1.0%) for 6 hours and then backwashed with HCl (1.0%) for 2 hours before starting normal operation.

The UF filter operating condition according to an embodiment of the present invention is one cycle of 29 minutes operation, 60 seconds of back washing and 90 seconds of flushing, and the drain and the time for each step are set to minimize the stepwise interference. At the time of backwashing, air of 12.0 Nm 3 / h is blown to remove particulate film contaminants on the surface of the film, and 80 ppm of NaOCl is simultaneously injected to reduce film contamination by organic substances.

And, periodic chemical cleaning is performed to reduce membrane fouling. The MF operation according to the embodiment of the present invention is operated so that the inter-membrane pressure difference reference does not exceed 0.2 atm, and the chemical cleaning is intensively performed once a month. Chemical washing was carried out by backwashing with NaOCl (500 ppm) for 2 hours, backwashing with NaOCl (0.3%) and NaOH (1.0%), backwashing for 6 hours and backwashing with HCl (1.0%) for 2 hours Start normal operation

The wastewater filtered through the membrane filtration unit 30 flows into the RO filtration unit 40. In the RO filtration unit 40, the filtered wastewater flows through the membrane filtration unit 30 to produce the final process acceptance production number (S4).

Specifically, a scale inhibitor, a chemical cleaning liquid, and the like are injected into the RO filtration unit 40 every predetermined period, thereby suppressing scale formation on the surface of the RO membrane, or removing the preformed scale. The RO filtration unit 40 is operated in three stages, and the cleaning cycle can be flexibly controlled. Further, in a specific embodiment, when the flow rate of the wastewater fed into the RO filtration unit 40 is 15 LMH and the operation pressure is 10 atm or less, a recovery rate of about 70% is obtained, and 30% (60, HMVR evaporator) (S5).

That is, in the specific embodiment, approximately 70% of the filtered water filtered in the RO filtration unit 40 is discharged and reused as industrial water, and about 30% of the filtered water is unfiltered residual concentrated water and flows into the HMVR evaporator 60 . The injection period of the cleaning liquid introduced into the RO filtration unit and the membrane filtration unit 40 is based on the filtration characteristic that is influenced by the pH value of the wastewater flowing into the RO filtration unit 40.

Specifically, in the treatment system 100 for reusing iron wastewater according to an embodiment of the present invention, the cleaning liquid stored in the cleaning liquid tank 50 is introduced into the cleaning liquid tank 50, in which the cleaning liquid such as an anti- To the RO filtration unit 40. Also, the injection control unit 51 controls the specific period based on the pH value of the wastewater flowing into the RO filtration unit 40. That is, depending on the pH value of the incoming wastewater, the injection period of the cleaning liquid and the input amount of the cleaning liquid are different (for example, when the pH value is relatively high, the cleaning period is shortened because the scale is formed quickly) The cleaning cycle is shortened, and when the pH value is relatively low, the cleaning cycle is relatively long.

In addition, although the cleansing water is discharged to a separate wastewater treatment plant through a separate discharge port when the scale cleaning liquid is poured and cleaned, in an embodiment of the present invention, such a cleansing water can be reused through the concentrated water treatment process do.

As described above, the concentrated water (about 30% of the influent water) generated by the RO filtration unit 40 flows into the concentrated water treatment unit and the remaining filtered water (about 70%) is discharged to be reused as industrial water or the like .

In the instant embodiment of the present invention, the concentrated water treatment section may be configured to include the HMVR (60). The concentrated water flowing into the HMVR (60) is evaporated, and the distilled water condensed by evaporation is circulated to the RO filtration unit (40) again. In one embodiment of the present invention, the HMVR 60 converts at least 90% of the concentrated water to distilled water to produce treated water by MD (membrane distillation), then distilled water is mixed with the product water of the RO filtration unit 40 . The evaporated water generated in the HMVR (60) is also discharged and processed.

FIG. 3 shows a block diagram of an HMVR 60 according to an embodiment of the present invention. FIG. 4 is a block diagram illustrating the principle of the HMVR 60 according to an embodiment of the present invention.

Specifically, as shown in FIG. 3, concentrated water discharged from the RO filtration unit 40 flows into the evaporation tank 61 and is stored (S6) in the concentrated water treatment process through the HMVR evaporator 60. Referring to FIG. The concentrated water stored in the evaporation tank 61 is supplied with a heat source and is evaporated (S7). Then, the evaporated steam passes through the MD membrane filter 62, and water vapor of 100 ° C or higher is discharged (S8). Steam of 100 ° C or more flows through the heat exchange pipe 63 provided in the evaporation tank 61 and performs heat exchange with the concentrated water stored in the evaporation tank 61 (S9). That is, the heat source for evaporation of the concentrated water in step S7 is supplied by steam exceeding 100 캜 flowing through the heat exchange pipe 63.

As shown in FIG. 3, the principle of the specific HMVR (60) is that the apparatus capable of recovering up to 95% of the concentrated SDI concentration of the RO filtration unit 40 process is capable of highly concentrated concentrated water treatment. That is, 578 kcal is added to the concentrated water introduced into the evaporation tank 61 after being discharged from the minimum RO filtration unit 40 and evaporated. Thereafter, the water vapor is returned to the inside of the evaporation tank 61 through the MD membrane filter, And flows into the pipe 63 to exchange the steam of 138 with the concentrated water stored in the evaporation tank 61 by 578 kcal to evaporate the concentrated water. Therefore, theoretically, the energy required to produce distilled water becomes 0 kcal, and the purified water becomes low-energy.

More specifically, as shown in FIG. 4, when a heat quantity of 80 kcal is applied to 1 L of raw water (filtered water injected from the RO filtration section 40) of 20, the liquid becomes 100, and when a further heat of 578 kcal is supplied, 138 < / RTI > Then, the high-pressure saturated water vapor is discharged to the high-temperature superheated water vapor at a pressure similar to the atmospheric pressure through the MD 62 without any additional energy.

The superheated steam passes through the heat exchange pipe 63 having the large latent heat and the small sensible heat exchanger and transfers heat of 578 kcal and 80 kcal to the raw water in the evaporation tank 61, It is discharged in the form of distilled water (distilled water).

The distilled water generated by the HMVR 60 is about 95% of the introduced concentrated water, and the distilled water is merged with the production water of the RO filtration unit 40 through the MD (S10). Then, the evaporated water generated in the HMVR 60 is also discharged and processed (S11).

10: Filtration filter section
20: pH adjuster
30: membrane filtration section
40: RO filtration section
50: Cleaning liquid tank
51:
60: heat exchange evaporator
61: Evaporation tank
62: MD
63: heat exchanger tube
100: Processing system for recycling steel wastewater

Claims (20)

A treatment method for reusing iron wastewater, comprising:
Lowering the pH value of the wastewater by flowing the iron wastewater into the pH adjusting unit;
The wastewater discharged from the pH adjusting unit flows into the membrane filtration unit to perform membrane filtration;
The filtered wastewater flows into the RO filtration unit through the membrane filtration unit to produce a final process water;
The concentrated water generated by the RO filtration unit flows into the concentrated water treatment unit, and the remaining filtered water is discharged for reuse; And
Wherein the concentrated water is evaporated by the concentrated water treatment unit, and the distilled water generated by the concentration treatment is circulated to the RO filtration unit again.
A treatment method for reusing iron wastewater, comprising:
The wastewater flows into the filtration filter portion to filter particles of the wastewater that have a specific diameter or more;
Filtering the wastewater into the pH adjusting unit to lower the pH value of the wastewater;
The wastewater discharged from the pH adjusting unit flows into the membrane filtration unit to perform membrane filtration;
The wastewater filtered through the membrane filtration unit flows into the RO filtration unit to produce a final process water;
The concentrated water is introduced into the HMVR by the RO filtration unit and the remaining RO filtered water is discharged for reuse; And
Wherein the RO concentrated water is evaporated by the HMVR and the distilled water produced by the evaporation treatment is subjected to MD treatment and then merged with the production water of the RO filtration unit. Way.
3. The method according to claim 1 or 2,
In lowering the pH of the wastewater,
Wherein the pH of the wastewater flowing into the pH adjusting unit is 8 to 11 and the pH of the wastewater discharged from the pH adjusting unit is 5.5 to 7.5.

The method of claim 3,
Wherein the pH adjuster adjusts the pH value using inorganic acid.

3. The method according to claim 1 or 2,
Wherein the step of introducing and filtering the membrane filtration unit comprises:
Wherein at least one of a UF filter and an MF filter is used.
3. The method according to claim 1 or 2,
Wherein said scaling step comprises:
And introducing at least one of the scaling inhibitor and the chemical cleaning liquid into the RO filtration section by the input means at every predetermined cycle.
3. The method according to claim 1 or 2,
Wherein said discharging comprises:
60 to 80% of the filtered water to be discharged is recovered and discharged,
And the remaining 20 to 40% is introduced into the HMVR as concentrated water.
The method according to claim 6,
Wherein the charging control unit controls the charging unit based on the pH value of the wastewater discharged from the pH adjusting unit to adjust the flow rate and the charging period of the cleaning liquid to be supplied to the RO filtration unit.
3. The method according to claim 1 or 2,
In the step of circulating to the RO filtration unit,
Wherein the concentrated water treatment unit comprises HMVR.
10. The method of claim 9,
Wherein the HMVR converts 90 to 97% of the concentrated water to distilled water, and after the distilled water is subjected to the MD treatment, it is merged with the water produced by the RO filtration unit.
11. The method of claim 10,
Storing the concentrated water in an evaporation tank;
The concentrated water stored in the evaporation tank is supplied with a heat source and evaporated;
The evaporated water vapor is discharged through the MD to water vapor exceeding 100; And
Wherein the water vapor exceeding 100 flows through a heat exchange tube provided in the evaporation tank and is heat-exchanged,
Wherein the heat source is supplied by the steam exceeding 100 flowing through the heat exchange pipe.
A pH adjusting unit to reduce the pH of the wastewater into which the iron wastewater flows;
A membrane filtration unit for introducing wastewater discharged from the pH adjustment unit and filtering the wastewater;
An RO filtration unit that receives filtered wastewater through the membrane filtration unit to remove contaminants from the wastewater; And
And a concentrated water treatment unit for collecting the distilled water generated by the evaporation treatment and the MD after the concentrated water untreated by the RO filtration unit is mixed with the water produced by the RO filtration unit. .
A filtration filter unit for filtering wastewater from the wastewater into particles having a diameter greater than a specific diameter;
A pH adjusting unit for reducing the pH of the wastewater into which the steel wastewater filtered by the filtration filter unit flows;
A membrane filtration unit for introducing wastewater discharged from the pH adjustment unit and filtering the wastewater;
An RO filtration unit that receives filtered wastewater through the membrane filtration unit to remove contaminants from the wastewater; And
And a concentrate water treatment unit for introducing the untreated concentrated water by the RO filtration unit and distilled water generated by the evaporation treatment through the MD and then joining with the product water of the RO filtration unit. Processing system.
The method according to claim 12 or 13,
Wherein the membrane filtration unit comprises at least one of a UF filter and an MF filter.
The method according to claim 12 or 13,
Further comprising a cleaning liquid input means for inputting the anti-scale agent stored in the cleaning liquid tank to the RO filtration section.
16. The method of claim 15,
Further comprising an input control unit for controlling the flow rate of the cleaning liquid to be supplied to the RO filtration unit and the charging period by controlling the cleaning liquid input means based on the pH value of the wastewater discharged from the pH adjusting unit Processing system.
The method according to claim 12 or 13,
Wherein the concentrated water treatment unit comprises an HMVR.
18. The method of claim 17,
In the HMVR,
A evaporation tank in which concentrated water is stored;
An MD in which condensed water stored in the evaporation tank is evaporated to generate steam to remove residual contaminants and steam is discharged in excess of 100;
And a heat exchange pipe installed in the evaporation tank to supply steam to the condensed water stored in the evaporation tank so that steam exceeding 100 discharged from the MD flows into the evaporation tank.
A recording medium on which a program code for executing a processing method for reusing iron wastewater according to claim 1 readable by a computer is recorded.
A recording medium on which a program code for executing a processing method for reusing iron wastewater according to claim 2 readable by a computer is recorded.

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