KR100691962B1 - Treatment Facilities and Method of Organic Carbon and Nitrogen in CPP Regeneration Wastewater - Google Patents

Abstract

The present invention discloses a regeneration wastewater treatment apparatus and treatment method for regeneration wastewater of a multi-desalting plant that can effectively treat organic carbon and nitrogen from regeneration wastewater generated in a desalination plant using a hardly decomposable organic substance ethanolamine as a pH adjusting agent of the cooling water . do. Regeneration wastewater treatment apparatus of a multiple desalination plant according to the present invention is a flocculation settling tank to remove the flocculated suspended solids in the settling tank after the flocculating agent is added to flocculate to remove the suspended solids in the waste water, and the remaining suspended substances not removed in the settling tank Sand filtration to remove, ozone treatment equipment to convert hardly decomposable substances such as ethanolamine from electrolyzed wastewater from suspended solids, and electrolyzed ozone treated wastewater. In order to make it possible, the regeneration wastewater is mixed with seawater, which is an electrolysis catalyst, to form a catalyst mixture, and the regeneration wastewater catalyst mixture flowing from the catalyst mixing tank is electrolyzed by using an electrode plate module equipped with an anode and a cathode. Electrolysis treatment apparatus for treating catalyst mixture water to be directly and indirectly oxidized, and It includes an activated carbon filtration tank that removes chlorine oxidant and oxidative by-products from activated catalyst mixture using activated carbon, and an electrode plate cleaning tank for efficient and economical cleaning of contaminated electrode plates through long time electrolysis. There is a characteristic. In particular, the use of seawater containing a large amount of chlorine ions as a catalyst for electrolytic treatment of regenerated wastewater in multiple desalination facilities has the advantage of making the most of the direct and indirect oxidation effects of electrolysis treatment. The treatment effect on nitrogen can also be improved.

Multiple desalination plant, recycled wastewater, ethanolamine, flocculation settling tank, ozone treatment tank, electrolysis treatment tank, electrode plate cleaning tank, seawater

Description

Treatment Facilities and Methods of Organic Carbon and Nitrogen Treatment for Regeneration Wastewater in Multiple Desalination Plants {Treatment Facilities and Method of Organic Carbon and Nitrogen in CPP Regeneration Wastewater}

1 is a schematic view showing a regeneration wastewater treatment apparatus of a plurality of desalination plant according to the present invention, Figure 2 is a perspective view of the electrode plate module according to the present invention, Figure 3 is a flow chart of the regeneration wastewater treatment method according to the present invention.

♠ Explanation of symbols for the main parts of the drawing ♠

1: flow rate adjusting tank 3: flocculation settling tank

5: sand filtration tank 7: ozone treatment tank

9: catalyst mixing tank 11: electrolysis treatment tank

13: activated carbon filtration tank 15: electrode plate cleaning tank

17 discharge tank 20 electrode plate module

The present invention relates to a regeneration wastewater treatment apparatus and a treatment method of a plurality of desalination facilities, and more particularly, to the regeneration wastewater generated from a plurality of desalination facilities, after adding seawater as a catalyst, the regeneration wastewater mixed with seawater is treated with ozone and electrolysis. It relates to a regeneration wastewater treatment apparatus and treatment method of a plurality of desalination plant. High-temperature, high-pressure boilers used in nuclear power plants are supplied with high-purity cooling water from which impurities contained in plural water are removed. Impurities contained in the plurality are adsorbed on the ion exchange resin of the multiple desalination plant, and regeneration waste water is generated during the regeneration of the saturated ion exchange resin. Wastewater is generated. Ethanolamine is also released during the regeneration of the ion exchange resin in the multiple desalination plant, increasing the concentration of organic substances and nitrogen in the regeneration wastewater. Ethanolamine contained in the regenerated wastewater can be treated by flocculation sedimentation process, which is a general physicochemical treatment, or biologically hardly decomposable wastewater by treatment. However, when ethanolamine is removed by the coagulation precipitation process, the removal efficiency of ethanolamine is very low, and biological treatment for ethanolamine is not yet developed. In order to improve this problem, an electrolytic flotation method of electrolytically treating regenerated wastewater using an electrode plate module made of iron or aluminum has been widely used. The electrolytic flotation method is to treat regenerated waste water by electrocoagulation of electrode plate. When electroaggregation, a large amount of sludge is generated and the sludge is adsorbed on the electrode plate and the electrode plate is corroded. The problem is occurring. In order to improve such a problem, the research which replaces the electrode plate used at the time of an electrolysis process with an insoluble electrode plate is actively performed recently. However, the electrolysis treatment using insoluble electrode plate also has a problem that if the electrolyte such as chlorine ions contained in the recycled wastewater is insufficient, the electrical conductivity is lowered and the efficiency is lowered. This is causing. In addition, since the insoluble electrode plate is manufactured in the form of a plate, in order to increase the current density of the electrode plate, a large current must be applied to the electrode plate, which causes a problem in that the power ratio increases.

The present invention was developed to secure various problems of the prior art as described above, and an object of the present invention is to change the non-degradable organic material in the regeneration wastewater into an electrolytic material through ozone treatment, and thus regenerate the ozone treatment. By treating the wastewater with seawater containing chlorine ions as a catalyst, not only can the treatment effect be improved, but the organic matter and nitrogen contained in the regenerated wastewater can be directly and indirectly oxidized to remove it. The present invention provides a regeneration wastewater treatment apparatus and treatment method for a multiple desalination plant. Another object of the present invention is to periodically clean the contaminated electrode plate by electrolytic treatment for a long time to remove the contaminants remaining on the electrode plate, thereby improving the electrolytic treatment efficiency and at the same time improve the durability due to corrosion of the electrode plate. The present invention provides a regeneration wastewater treatment apparatus and treatment method for a multiple desalination plant. Still another object of the present invention is to provide a regeneration wastewater treatment apparatus and treatment method of a plurality of desalination facilities that can reduce the power used during electrolysis by increasing the current density of the electrode plate by making the anode of the electrode plate in a net form. There is.

Regeneration wastewater treatment apparatus of a plurality of desalination plant according to the present invention for achieving the above object is introduced into the regeneration wastewater generated in the plurality of desalination facilities and by adding a flocculant to the regeneration wastewater to agglomerate suspended solids contained in the regeneration wastewater Coagulation sedimentation tank for sedimentation, sand filtration device for removing flocculated suspended solids, ozone treatment apparatus for converting non-degradable organic substances in regenerated wastewater from which suspended solids are removed to electrolytic organic substances, and ozonated recycled wastewater A catalyst mixing tank that mixes with seawater, which is a catalyst, to be mixed and introduced into the electrolysis process, and the mixed water introduced from the catalyst mixing tank using an electrode plate module equipped with a positive electrode plate and a negative electrode plate is directly and indirectly oxidized by electrolysis. Electrolysis treatment apparatus to treat as possible, and chlorine oxidant and oxidation part remaining in the electrolyzed mixed water And characterized in that configured to include with the activated carbon to remove the water using activated carbon filtering device, three electrode plates for cleaning a contaminated tub electrode plate. In addition, the method for treating regenerated wastewater in a plurality of desalination facilities according to the present invention includes a precipitation step of precipitating suspended solids contained in the regenerated wastewater by adding a flocculant to the regenerated wastewater generated in the plurality of desalination facilities, and the suspended solids precipitated. A sand filtration step for filtering the fine aggregates remaining in the regeneration wastewater, an ozone treatment step for ozone treatment of the regeneration wastewater filtered in the filtration step, and a floating material and a marine organism to electrolyze the regeneration wastewater treated by the ozone treatment. A catalyst mixing step of mixing the removed seawater to form mixed water, an electrolysis step of electrolyzing the mixed water so that the contaminants contained in the mixed water are directly and indirectly oxidized, and the electrolyzed mixing Activated carbon filtration step for removing chlorine oxidant and oxidative by-products remaining in water using activated carbon, and for a long time The electrode plate comprising a cleaning step of cleaning a contaminated electrode plate as characterized. Hereinafter, with reference to the accompanying drawings, an apparatus and a treatment method for regeneration wastewater treatment of a plurality of desalination facilities according to the present invention will be described in detail. Referring to FIG. 1, a regeneration wastewater treatment apparatus of a plurality of desalination facilities includes a flow rate adjustment tank 1 for maintaining a constant flow rate and water quality of the regeneration wastewater, a settling tank 3 for precipitating suspended solids of the regeneration wastewater, and flocculation flotation. A sand filtration apparatus for filtering the substance (5), an ozone treatment apparatus (7) for converting the hardly decomposable organic substance into an electrolysable organic substance, and a catalyst mixing tank (9) for mixing the regeneration wastewater with seawater to form mixed water And an electrolytic treatment device 11 for electrolyzing the mixed water, an activated carbon filter device 13 for removing chlorine oxidizer and oxidative by-product of the electrolyzed treated water, and an electrode plate cleaning device for cleaning the contaminated electrode plate. It consists of 15). The flow regulating tank 1 is accommodated in the flow regulating tank 1 through the inflow pipe of the regeneration waste water generated from the multiple desalination plant, and the regeneration waste water contained in the flow regulating tank 1 is agitated in the flow regulating tank 1 by agitation. It is discharged to the coagulation sedimentation tank 3 while being kept constant. The bottom surface of the flocculation sedimentation tank 3 is inclined downward to the center, and the sludge discharge part 3a which collect | aggregates aggregates, ie, sludge, is provided in the center part. Various aggregates precipitated on the bottom surface of the settling tank 3 are collected in the sludge discharge portion 3a by the inclined surface and then discharged through the discharge pipe 3b. The sand 5a is stacked in the sand filtration tank 5 so as to filter suspended matter and fine aggregates of the regenerated waste water which have not been removed from the settling tank 3. The regenerated wastewater passes through the sand layer 5a to remove residual suspended matter and fine aggregates which are not precipitated in the settling tank. The ozone treatment tank 7 is composed of an ozone generator 7a, a gas supply device 7b, and an ozone contact nozzle 7c. The regeneration wastewater that has passed through the filtration tank 5 is ozonated, and the hardly decomposable organic substances are electrolyzed. It is transformed into organic material as much as possible The ozonated recycle wastewater is discharged to the catalyst mixing tank 9. In the catalyst mixing tank 9, mixed water is made by mixing ozone-treated regenerated wastewater and seawater, which is a catalyst. One side of the catalyst mixing tank 9 is provided with a seawater pump 9a so as to mix regeneration wastewater and seawater at a predetermined ratio, and an aeration device 9b is installed therein. The aeration device 9b agitates the regeneration wastewater and the seawater flowing into the mixing tank 9. On the other hand, the seawater is introduced into the mixing tank (9) after the suspended matter and marine life is removed from the seawater filtration device (10). In the electrolysis treatment tank 11, an electrode plate module 20 receiving current from the power supply unit 11a is installed to electrolyze the mixed water flowing from the catalyst mixing tank 9. The power supply 11a applies electric power to the electrode plate module by adjusting a current to the electrode plate module 20. The electrolytic treatment tank 11 according to the present invention is preferably provided with a plurality of electrode plate modules so that the mixed water can be electrolytically contacted with the electrode plate. The activated carbon filtration tank 13 removes residual oxidant and oxidative by-products from the oxidant generated during the electrolysis process and passes through the activated carbon filtration tank 13 filled with granular activated carbon. 2, the electrode plate 21 of the electrode plate module 20 according to the present invention is composed of a positive electrode 22 and a negative electrode 23 for directly and indirectly oxidizing the recycle wastewater mixed water, the positive electrode 22 Iridium dioxide (IrO ₂ ) is electrodeposited on silver titanium (Ti), and the cathode 23 is made of stainless steel. The anode 22 of the electrode plate module 20 is manufactured in a net form in order to have a high current density at a low current. On the other hand, in the process of electrolyzing the catalyst mixture water, a lot of contaminants, that is, scale, sludge, etc. are attached to the electrode plate surface of the electrode plate module 20, in order to remove the electrode plate module 20 can be cleaned The electrode plate cleaning tank 15 is provided. The electrode plate module 20 is transferred to the electrode plate cleaning tank 13 by the electrode plate module transfer device 12 installed in the electrolysis treatment tank 11. The inside of the electrode plate cleaning tank 15 is provided with a stirring nozzle 15a so that the electrode plate module 20 can be efficiently cleaned by the cleaning liquid. It is preferable that the washing | cleaning liquid used for the cleaning of the electrode plate module 20 maintains pH below 2 using hydrochloric acid. The washing waste liquid generated after washing the electrode plate module 20 is returned to the flow rate adjusting tank 1 and mixed with the regeneration waste water for treatment. The treated water electrolyzed in the electrolysis treatment tank 11 is discharged to the activated carbon filtration tank 13. Activated carbon filtration tank 13 is provided with activated carbon to remove chlorine oxidant and oxidative by-products remaining in the treated water, and the final treated water finally treated in the activated carbon filtration tank 13 flows into the discharge tank 17 to the ocean. Discharged. The regeneration wastewater treatment method according to the regeneration wastewater treatment apparatus of the multiple desalination plant having the above configuration will now be described. 1 and 3, in the flocculation sedimentation tank 3, a flocculation sedimentation step (S50) of adding a flocculant to the regeneration wastewater in order to precipitate the suspended matter remaining in the regeneration wastewater introduced therein is performed. In the coagulation sedimentation step (S50), aluminum sulfate and a coagulant aid are added to the regeneration wastewater to coagulate the suspended solids remaining in the regeneration wastewater, thereby increasing the settling property to precipitate. Fine aggregates not precipitated in the flocculation sedimentation step (S50) are filtered by the sand layer (5a) while the regeneration waste water passes through the sand filtration tank (5) (S52). In the ozone treatment step (S54), the regenerated wastewater passed through the sand filtration step (S110) is subjected to a process of changing the hardly decomposable organic material into an electrolytically degradable organic material in the ozone treatment tank (7) and the seawater in the catalyst mixing tank (9). The mixing step S56 is performed. In the catalyst mixing step (S56), mixed water is made by mixing seawater containing a large amount of chlorine ions in the regenerated wastewater so as to easily electrolyze the regenerated wastewater. Chlorine ions in seawater are used as catalysts in the electrolysis of recycled wastewater. In the catalyst mixing step S56, the regeneration wastewater and the seawater are completely stirred by the aeration device 9b. The mixing ratio of the recycled wastewater and the seawater according to the present invention is preferably mixed with the recycled wastewater 70 to 80% by weight: seawater 20 to 30% by weight based on the total mixed water. In the electrolysis treatment tank 11, an electrolysis treatment step (S58) of electrolyzing the mixed water introduced using the electrode plate module 20 equipped with the positive electrode plate and the negative electrode plate is performed. In the electrolytic treatment step (S58) is directly and indirectly oxidized by the contaminant electrode plate module 20 contained in the mixed water. Since the electrolysis step (S58) is made in a plurality of electrolysis treatment tanks 11 are installed, it is possible to reduce the electrical resistance by the mixed water and to fully use the electrolyte, thereby increasing the treatment efficiency of the contaminants and increasing the current density. Since it can lower the power ratio. In the electrolytic treatment step S58 according to the present invention, it is preferable to electrolyze the mixed water for about 1 to 2 hours while maintaining the current density of the electrode plate module 20 at 2 to 5 A / dm. In the activated carbon filtration tank 13, the activated carbon filtration step S60 is performed in which the treated water treated in the electrolytic treatment step S58 is introduced and filtered. Activated carbon filtration step (S60) is used to remove chlorine oxidant and oxidative by-products remaining in the electrolyzed treated water using granular activated carbon. And the final treated water after the activated carbon filtration step (S60) is received in the discharge tank 17 is discharged to the ocean. In the electrode plate cleaning tank 15, as the electrolysis is performed for a long time, the electrode plate cleaning step of cleaning using the contaminated electrode plate acid is increased. Hereinafter, the principle of electrolytic oxidation in the ozone treatment step (S54) and the electrolysis treatment step (S58) according to the present invention will be described in detail. First, the hardly degradable organic substances contained in the regenerated wastewater are transformed into degradable organic substances by attacking the double bonds in the molecules of the organic substance by the strong oxidizing ozone to break the connection.

The decomposition process by ozone treatment is as follows.

O ₂ + high voltage-> O ₃

O ₃ + Organics-> Oxidation Byproducts + H ₂ O + CO ₂

Decomposable contaminants contained in the mixed water mixed with ozonated wastewater and seawater in the catalytic mixing tank are removed by direct anodization or indirect oxidation. In direct anodization, contaminants are removed by positive electron exchange by contacting the positive plate. Indirect oxidation oxidizes contaminants in mixed water by powerful oxidants, such as hypochlorous acid, produced electrochemically in electrolysis. Therefore, since seawater is rich in electrolytes, direct oxidation and indirect oxidation by chlorine proceed rapidly, so that an oxidizing effect can be obtained in a short time. The electrolytic treatment not only oxidizes organic substances present in the mixed water, but also completely oxidizes and removes contaminants such as nitrogen into stable substances, and can destroy E. coli and pathogenic bacteria through direct or indirect oxidation. . For the above reason, in the present invention, seawater containing a large amount of chlorine ions is used as a catalyst, and the electrolysis process of chlorine is as follows.

_{^{Anode: 2Cl - -> Cl 2 (}} dissolved) + 2e -

^{_{Cathode: 2H 2 O + 2e - -}} > 2OH - + H 2

Inter-electrode _{reaction: Cl 2 + H 2 O -} > HOCl + Cl - + H +

HOCl ^-> OCl - ⁺ H +

That is, hypochlorous acid (HOCl) at the anode and hypochlorite ions (OCl ⁻ ) are generated at the cathode, and the intermediate product indirectly oxidizes organic substances in water. Next, looking at the removal of organic matter by electrolysis, the metal ions of the solution in which the electrolyte is acidic is oxidized from the stable state to the excited state during the electrolysis process to produce a reactant as an intermediate product. A large amount of organic material is oxidized at the anode and diffused into the solution with carbon dioxide.

^{xM n + -> xM (n} + 1) + + xe -

xM ^{(n + 1) +} + + xe reacting agent ^- -> xM ^{+ n} + yCO ₂

In other words, the electrolysis of organic materials is oxidized at the anode, but the direct oxidation of hydroxide ions due to the electrolysis of water on the electrode surface to oxidize the organic matter and the indirect oxidation by intermediate products such as hypochlorous acid produced by the electrolysis of chlorine. Can be divided into Direct oxidation and indirect oxidation will be described in detail with reference to FIGS. 4A and 4B.

Direct Oxidation

In the organic material removal by direct oxidation, hydroxide ions generated by electrolysis of water are adsorbed on the anode, as shown in the following equation.

_{H 2 O + M [] -} > M [OH] + H + + e -

The organic material is oxidized by the hydroxide ions absorbed and merged on the surface of the electrode. The reaction formula is as follows and proceeds well in the acid solution of high current density.

R + M [OH] -> M [] + RO + H + + e -

Here, RO is an organic material oxidized by hydroxide ions which are continuously formed, and continues the anode discharge in water. And the hydroxide ion produced by the electrolysis of water in the oxidized anode (MO _x) is adsorbed and reacts with the already generated oxygen to form more oxidized anode (MO _{x + 1).} In addition, the organic substance (R) is decomposed into carbon dioxide, water or hydrogen ions by reacting with hydroxide ions adsorbed on the oxidizing anode, and the equation is as follows.

_{MO x + H 2 O ->} MO x [OH] + H + + e -

_{R + MO x [OH] z} -> CO 2 + zH + + ze - + MO x

Indirect Oxidation

In the electrochemical reaction of organic substances removed by indirect oxidation, anodization of chlorine occurs simultaneously during electrolysis, hypochlorous acid is formed on the electrode surface. The reaction in which the organic material is oxidized by the hypochlorous acid generated at the anode is as follows.

_{H 2 O + M [] +} Cl - -> M [HOCl] + H + + 2e -

R + M [HOCl] -> M [] + RO + H + + Cl -

An example of the electrolysis process is shown below. It is oxidized to benzoquinone and then oxidized to maleic and carbon dioxide, competing with the oxygen evolution reaction and preferentially reacting with oxygen generation at high oxygen overvoltages.

_{C 6 H 7 N + 2H 2} O -> C 6 H 4 O 2 + 3H + + NH 4 + + 4e -

_{C 6 H 4 O 2 + 6H} 2 O -> C 4 H 4 O 4 + 2CO 2 + 12H + + 12e -

_{C 4 H 4 O 4 + 5H} 2 O -> H 2 O + 4CO 2 + 12H + + 12e -

On the other hand, the removal mechanism of nitrogen contaminants in the regeneration wastewater is as follows.

_{Cl 2 + H 2 O ->} HOCl + Cl - + H +

2NH ₃ + 3HOCl-> N ₂ (gas) + 3H ₂ O + HCl

The produced chlorine gas first combines with the highly reactive ammonia nitrogen to produce combined residual chlorine, which is then decomposed in water to form free residual chlorine. Therefore, the combined residual chlorine is oxidized once more by chlorine gas / free residual chlorine and consumed as nitrogen gas. The recycled wastewater treated by the electrolysis reaction as described above changes the water quality of the treated water according to the time of electrolysis in the electrolysis treatment tank 11, that is, the mixing time of the mixed water staying in the electrolysis treatment tank 11. <Table 1> Changes in COD Concentrations in Treated Waters Associated with Ozone Treatment and Electrolysis Treatment.

Treatment method and processing time (minutes) COD concentration (mg / L) Ozone treatment (concentration 190 g / ㎥) 0 min 68.0 30 minutes 65.2 60 minutes 62.4 Electrolysis Treatment (Current 50A) 0 min 62.4 30 minutes 21.5 60 minutes  5.8

In addition, looking at the degree of removal of BOD and T-N (total nitrogen) at the optimum conditions of the electrolytic treatment tank 11, as shown in Table 2.

TABLE 2 BOD and T-N removal characteristics by electrolysis.

Sampling point Concentration (mg / L) BOD inflow 57 outflow  8 T-N inflow 40 outflow 10

As shown in Table 2, the BOD concentration of the electrolyzed water was 8 mg / L at a BOD concentration of 57 mg / L before inflow into the electrolytic treatment tank, thereby obtaining a removal rate of about 86%. In the case of T-N, 10 mg / L after electrolysis at 40 mg / L before the inflow shows a removal rate of about 75%. Therefore, BOD and T-N as well as COD could be effectively removed at the optimum condition of the electrolytic treatment device.

As described above, according to the regeneration wastewater treatment apparatus and treatment method of the multiple desalination plant according to the present invention, the regeneration wastewater is treated by ozone treatment and electrolysis treatment using seawater containing a large amount of chlorine ions as a catalyst. As well as the treatment effect is improved, there is an advantage that the organic substances and nitrogen contained in the regeneration wastewater is effectively treated by direct and indirect oxidation. In addition, since the anode of the electrode plate module is manufactured in the form of a net, the current density of the electrode plate module increases, so that the power used for electrolysis will be reduced, and the use of seawater as a catalyst has the effect of reducing the maintenance cost. In addition, there is no need for an accessory treatment facility for disinfection due to additional effects such as sterilization during the electrolysis process. In addition, by periodically cleaning the electrode plate module to remove the sludge remaining in the electrode plate module, not only improves the electrolysis efficiency of the electrode plate module, but also prevents corrosion of the electrode plate module, and also cleans used in the electrode plate module. The waste liquid can be used as a catalyst of the regeneration wastewater, thereby improving the treatment effect of the regeneration wastewater.

Claims (5)

       A coagulation sedimentation tank in which regeneration wastewater generated in a plurality of desalination facilities is introduced and coagulates and precipitates suspended solids contained in the regeneration wastewater by adding a coagulant to the regeneration wastewater; A sand filtration tank for filtering and removing the residual suspended solids; An ozone treatment tank for oxidatively treating the regenerated wastewater introduced from the sand filtration tank by using an ozone generator and an ozone contact tank; A catalyst mixing tank for mixing the regenerated wastewater introduced from the ozone treatment tank with seawater to make mixed water; An electrolysis tank that electrolyzes the mixed water to directly and indirectly oxidize the catalyst mixed water flowing from the catalyst mixing tank using an electrode plate module equipped with an electrode plate; An activated carbon filtration tank for removing chlorine oxidant and oxidative by-products remaining in the electrolyzed mixed water using activated carbon; Regeneration wastewater treatment apparatus for a plurality of desalination plant comprising an electrode plate cleaning tank for cleaning the electrode plate contaminated with long term operation. The regeneration wastewater of the multiple desalination plant according to claim 1, further comprising an electrode plate cleaning tank for removing contaminants adhering to the surface of the electrode plate module using a movable electrode plate module transfer device and a cleaning liquid. Processing unit. The regeneration wastewater treatment apparatus according to any one of claims 1 to 2, wherein a plurality of electrolysis treatment tanks are provided. The electrode of the electrode plate module according to any one of claims 1 to 2, wherein iridium dioxide (IrO) is electrodeposited on titanium (Ti) in a net form, and the cathode is made of stainless steel in a plate form. Regeneration wastewater treatment apparatus for a plurality of desalination plant, characterized in that. A flocculation sedimentation step of precipitating suspended solids contained in the regeneration wastewater by adding a flocculant to the regeneration wastewater generated in a plurality of desalination facilities; A sand filtration step of filtering the fine aggregated substances remaining in the regenerated wastewater in which suspended solids are precipitated; An ozone treatment step of allowing ozone treatment of the regenerated wastewater filtered in the filtration step; A mixing step of removing the suspended substances and marine organisms by electrolysis treatment catalyst to remove the regenerated waste water which has been ozone treated in the ozone treatment step and mixing them with sea water to make mixed water; An electrolysis step of electrolyzing the mixed water using an electrode plate module so that the contaminants included in the mixed water are directly and indirectly oxidized; Activated carbon filtration step of removing chlorine oxidant and oxidative by-products remaining in the electrolyzed mixed water using activated carbon; Regeneration wastewater treatment method of a plurality of desalination plant consisting of an electrode plate cleaning step of cleaning the contaminated electrode plate through the electrolytic treatment step.

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