A treatment system and method for the washing circulating water of the waste gas in carbon brick production

Abstract

The present invention relates to a treatment system and method for the washing circulating water of the waste gas in carbon brick production. The washing circulating water of the waste gas washing device in carbon brick production returns to the tar / skimmer integrated processor to remove tar and skimmer, then enters the primary coagulation sedimentation tank to remove a large amount of suspended solids, and then is lifted to the deep oil removal filter for deep oil removal. After that, it enters the ozone catalytic oxidation reactor to remove most of the organic pollutants, ammonia nitrogen and residual oils, and then enters the adsorption reactor to remove the remaining organic pollutants. After that, it enters the secondary coagulation sedimentation tank to remove the powdered activated carbon adsorbed with organic pollutants and the remaining suspended solids, and finally is lifted to the circulating water tank for circulating water supply to the waste gas washing device in carbon brick production. The present invention treats the washing circulating water of the waste gas in carbon brick production through a multi-stage physical and chemical combined process, greatly reducing the concentration of pollutants in the circulating water, meeting the water quality requirements for recycling, and solving the environmental protection pain points and difficulties of the wastewater in carbon brick production.

Description

Technical Field

[0001] The present invention relates to a treatment system and method for the waste gas washing circulating water in carbon brick production. Background Art

[0002] In the iron and steel industry, a blast furnace is a smelting device with a steel plate as the furnace shell and a refractory brick lining inside. The blast furnace body is divided into 5 parts from top to bottom: the throat, the shaft, the bosh, the hearth, and the hearth. Due to the good technical and economic indicators of blast furnace ironmaking, simple process, large production volume, high labor productivity, and low energy consumption, the iron produced by this method accounts for the vast majority of the world's total iron production. Among them, the refractory brick used as the lining of the blast furnace bottom and hearth is a carbon brick. The carbon brick is a refractory material product with good high-temperature resistance and wear resistance, which is mainly made of electrically calcined coal and added with an appropriate amount of binder and fired at high temperature. During the high-temperature firing process of the carbon brick, waste gas is generated, and the waste gas contains various oils and benzene ring organic compounds. After the waste gas is treated by circulating washing water and discharged, after the circulating washing water contacts the waste gas in the above link, the waste water contains a large amount of organic pollutants. To ensure the process of waste gas circulating washing, it is necessary to treat the circulating washing water.

[0003] At present, there are few reports on the treatment research of this waste water, and it is still in a technical blank. The water quality of this waste water is shown in Table 1.

[0004] Table 1 Water quality of typical waste gas washing circulating water in carbon brick production

[0005] Project Unit Index Suspended solids mg / L 340 Conductivity μS / cm <![CDATA[8.02×10 4 > Ammonia nitrogen mg / L <![CDATA[9.14×10 3 > pH Dimensionless 6.02 CODcr mg / L <![CDATA[2.16×10 5 > Sulfide mg / L ND Petroleum mg / L 488 Total cyanide mg / L 67.6 Phenol mg / L 183 Naphthalene mg / L 0.137

[0006] Since the composition of this waste water is very complex, containing a large amount of pollutants such as tar, organic matter, salts, and ammonia nitrogen, conventional water treatment processes are difficult to treat, and at the same time, it also poses a great environmental protection and safety risk. Therefore, there is an urgent need for an economically feasible treatment process to solve the problem of the technical blank in the treatment of carbon brick production waste water. Summary of the Invention

[0007] The purpose of the present invention is to provide a treatment system and method for the waste gas washing circulating water in carbon brick production. Through a multi-stage physical and chemical combined process of integrated treatment of tar / skimmer + primary coagulation sedimentation + deep oil removal filtration + ozone catalytic oxidation + adsorption + secondary coagulation sedimentation + recycling, the waste gas washing circulating water in carbon brick production is treated, the concentration of circulating water pollutants is greatly reduced, the water quality requirements for recycling are met, and the environmental protection pain points and difficulties of production waste water in the carbon brick production industry are completely solved.

[0008] To achieve the above purpose, the technical solution of the present invention is a treatment method for the waste gas washing circulating water in carbon brick production, including the following steps:

[0009] 1) Return the washing circulating water of the carbon brick production waste gas washing device to the tar / skimmings integrated processor, and remove the heavier tar and lighter skimmings simultaneously by gravity.

[0010] 2) After being treated by the tar / skimmings integrated processor, the water enters the primary coagulation sedimentation tank, and a large amount of suspended solids are removed by coagulation sedimentation.

[0011] 3) The wastewater treated by the primary coagulation sedimentation tank is lifted to the deep oil removal filter for deep oil removal.

[0012] 4) The wastewater treated by the deep oil removal filter enters the ozone catalytic oxidation reactor, and most of the organic pollutants, ammonia nitrogen and residual oil are removed by ozone catalytic oxidation.

[0013] 5) The wastewater treated by the ozone catalytic oxidation reactor enters the adsorption reactor, and powdered activated carbon is added to the adsorption reactor at the same time. The remaining organic pollutants are removed by the adsorption of powdered activated carbon.

[0014] 6) The wastewater treated by the adsorption reactor enters the secondary coagulation sedimentation tank, and the powdered activated carbon adsorbed with organic pollutants and the remaining suspended solids are removed by coagulation sedimentation.

[0015] 7) The water treated by the secondary coagulation sedimentation tank is lifted to the circulation water tank, and the water in the circulation water tank is used for circulating water supply to the carbon brick production waste gas washing device.

[0016] As one of the implementation modes, in step 1), the residence time of the wastewater in the tar / skimmings integrated processor is 20 - 30h, and then the skimmings and tar are removed respectively by the skimming device arranged at the top of the tar / skimmings integrated processor and the tar collection and discharge device arranged at the bottom.

[0017] As one of the implementation modes, in step 2), after the wastewater enters the primary coagulation sedimentation tank, a coagulant and a flocculant are added in sequence and stirred. The dosing concentration of the coagulant is 50 - 150mg / L, and the dosing concentration of the flocculant is 1 - 2mg / L. After the coagulation and flocculation reaction, a large amount of suspended solids form precipitates and are discharged; the total residence time of the wastewater in the primary coagulation sedimentation tank is 12 - 14h.

[0018] As one of the implementation modes, an oil removal filter material is arranged in the deep oil removal filter, and the wastewater is deeply deoiled by the filter adsorption of the oil removal filter material; the oil removal filter material adopts walnut shell filter material, the hydraulic load is 6 - 9m 3 / (m 2 ·h), and the filling height is 1.5 - 2.5m.

[0019] As one of the implementation manners, the ozone catalytic oxidizer adopts a three-stage series connection form, with a total residence time of 20 to 30 h, a single-stage height of 3 m, and each stage of the ozone catalytic oxidizer is provided with a catalyst and an ozone aeration device.

[0020] As one of the implementation manners, the filling rate of the catalyst is 40 to 80%, the catalyst adopts an aluminum-silicon composite loaded with metal oxides, the specific surface area is 200 to 250 m 2 / g, the particle size is 3 to 5 mm, and the ozone dosage of the ozone aeration device is 30 to 80 mg / L.

[0021] As one of the implementation manners, in step 5), the concentration of the powdered activated carbon added into the adsorption reactor is 500 to 700 mg / L, and the residence time is 1.5 to 3 h.

[0022] As one of the implementation manners, in step 6), after the wastewater enters the secondary coagulation sedimentation tank, a coagulant and a flocculant are added in sequence and stirred. The dosing concentration of the coagulant is 40 to 100 mg / L, and the dosing concentration of the flocculant is 1 mg / L. After the coagulation and flocculation reaction, the powdered activated carbon adsorbed with organic pollutants and the remaining suspended solids form a precipitate and are discharged; the total residence time of the wastewater in the secondary coagulation sedimentation tank is 12 to 14 h.

[0023] As one of the implementation manners, an overflow pipe is arranged at the water outlet of the primary coagulation sedimentation tank and is respectively connected to the ozone catalytic oxidizer, the secondary coagulation sedimentation tank and the circulation water tank.

[0024] The present invention also provides a treatment system for the washing circulating water of the waste gas in carbon brick production, including a tar / skimmer integrated processor, a primary coagulation sedimentation tank, a deep oil removal filter, an ozone catalytic oxidizer, an adsorption reactor, a secondary coagulation sedimentation tank, and a circulation water tank connected in sequence along the water flow direction; the water outlet of the waste gas washing device for carbon brick production is connected to the water inlet of the tar / skimmer integrated processor, and the water outlet of the circulation water tank is connected to the water inlet of the waste gas washing device for carbon brick production.

[0025] After the present invention adopts the above technical solutions, the following advantages are achieved:

[0026] (1) High treatment efficiency by multi-stage combination: Through a multi-stage physical and chemical combination process of tar / skimmer integrated treatment + primary coagulation sedimentation + deep oil removal filtration + ozone catalytic oxidation + powdered activated carbon adsorption + secondary coagulation sedimentation + circulation and reuse, the COD removal rate can reach 80 to 85%, the NH 4 -N removal rate can reach 60 to 70%, the SS removal rate can reach 90 to 95%, and the petroleum removal rate can reach 80 to 90%.

[0027] (2) Simple system: High processing efficiency. After treating the waste gas washing circulating water in carbon brick production, the COD, NH 4 -N, SS, petroleum substances and other pollutants in the wastewater can all meet the water quality requirements for circulating washing, and there is no need to discharge wastewater externally.

[0028] (3) Reduced floor area: Through the multi-stage combined treatment technology and the use of skid-mounted devices, it can be integrated into an integrated treatment skid-mounted equipment, reducing the floor area and the installation difficulty.

[0029] (4) Flexible treatment: Since the amount of waste gas washing circulating water in carbon brick production is small and the circulation system operates intermittently, the physical and chemical method adopted in the present invention has a rapid start and stop, and can maintain a 100% synchronization rate with the upstream circulating washing production line. At the same time, a partial bypass process is adopted. On the one hand, it can flexibly bypass when the upstream incoming water is good, saving operating costs, and on the other hand, it can ensure the treatment effect when the upstream incoming water is poor.

[0030] (5) Low investment: Adopting the multi-stage combined physical and chemical treatment method, each treatment unit is relatively independent and efficient, and complementary in treatment functions, greatly improving the treatment efficiency and saving investment.

[0031] (6) Good stability: A pre-treatment is set up to reduce the petroleum substances and suspended solids entering the ozone catalytic oxidation device. At the same time, the ozone catalytic oxidation uses a catalyst with high catalytic performance, greatly improving the removal efficiency of pollutants. A deep treatment is set up after the ozone catalytic oxidation device, and adsorption and coagulation precipitation are used to ensure that the effluent meets the standards for reuse, making the entire system have the advantages of strong anti-shock load and good stability. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a flow chart of the treatment process for the waste gas washing circulating water in carbon brick production provided by the embodiment of the present invention;

[0034] In the figure: 1. Waste gas washing device for carbon brick production; 2. Tar / oil integrated processor; 3. Primary coagulation sedimentation tank; 4. Deep oil removal filter; 5. Ozone catalytic oxidizer; 6. Adsorption reactor; 7. Secondary coagulation sedimentation tank; 8. Circulation pool. Detailed Embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0036] Embodiment 1

[0037] The carbon brick is gradually heated in the production kiln and gradually cracked into gaseous substances containing various organic matters. After being collected through the gas collection port on the sealing cover and treated by the dust removal gas, it enters the tail gas scrubbing tower. Various cracked organic matters are washed into the water, and at the same time, the tail gas is cooled and controlled. The washed water flows into the collection pool and is lifted by the self-priming pump and sprayed into the scrubbing tower again for recycling. Due to continuous recycling, various complex organic matters and suspended solids are gradually enriched in the water, resulting in exceeding the standard of benzene ring substances, poor washing effect, poor heat exchange effect, and the discharged flue gas containing excessive water vapor, generating white smoke.

[0038] The water quality of the washing circulating water of the carbon brick production waste gas washing device 1 is detected, and its COD cr ≤25×10 4 mg / L, ammonia nitrogen ≤ 1×10 4 mg / L, conductivity ≤ 10×10 4 μS / cm, SS ≤ 400mg / L, petroleum substances ≤ 500mg / L. Therefore, it is necessary to treat the washing circulating water so that the effluent meets the requirements of COD cr ≤5×10 4 mg / L, ammonia nitrogen ≤ 0.4×10 4 mg / L, SS ≤ 40mg / L, petroleum substances ≤ 100mg / L, meeting the reuse requirements.

[0039] As Figure 1 shown, this embodiment provides a method for treating the washing circulating water of carbon brick production waste gas, including the following steps:

[0040] 1) Return the washing circulating water of the carbon brick production waste gas washing device 1 to the tar / oil slick integrated processor 2, and the residence time is 24h; a floating oil scraping device is arranged at the top of the tar / oil slick integrated processor 2, and a tar collection and discharge device is arranged at the bottom. Under the action of gravity, the floating oil floats on the upper surface, and the tar deposits at the bottom. The denser tar and the lighter floating oil are removed simultaneously through the floating oil scraping device and the tar collection and discharge device;

[0041] 2) After being treated by the tar / skimmings integrated processor 2, it enters the primary coagulation sedimentation tank 3. Inside the primary coagulation sedimentation tank 3, there are successively arranged a coagulation zone, a flocculation zone, a sedimentation zone and an intermediate water tank; the wastewater first enters the coagulation zone, and a coagulant is added to the coagulation zone. The added coagulant is PAC, and the dosing concentration is 100 mg / L. At the same time, the coagulation stirring device in the coagulation zone is started to stir evenly; then the wastewater enters the flocculation zone, and a flocculant is added to the flocculation zone. The added flocculant is PAM, and the dosing concentration is 1 mg / L. At the same time, the flocculation stirring device in the flocculation zone is started to stir evenly; then the wastewater enters the sedimentation zone. After sedimentation treatment, a large amount of suspended substances and other pollutants are intercepted at the bottom of the sedimentation zone and discharged, and the clear water enters the intermediate water tank from the upper part of the sedimentation zone, and then is lifted to the next stage by a lift pump; the total residence time of the wastewater in the primary coagulation sedimentation tank 3 is 12 h;

[0042] 3) The wastewater treated by the primary coagulation sedimentation tank 3 is lifted to the deep oil removal filter 4 by a lift pump. Inside the deep oil removal filter 4, there is an oil removal filter material. The oil removal filter material uses walnut shell filter material, and the hydraulic load is 7 m 3 / (m 2 ·h), and the filling height is 2 m. The oil removal filter material deeply removes oil from the wastewater by means of filtration and adsorption, especially tar with a relatively high viscosity;

[0043] 4) The wastewater treated by the deep oil removal filter 4 enters the ozone catalytic oxidation reactor 5. Inside the ozone catalytic oxidation reactor 5, there are a catalyst layer and an ozone aeration device. The ozone aeration device is located below the catalyst layer. The catalyst of the catalyst layer uses an aluminum-silicon composite as a carrier and is loaded with metal oxides (Cu / TiO 2 ), the specific surface area is 230 m 2 / g, the particle size is 4 mm, and the ozone dosage is 60 mg / L. Most of the organic pollutants, ammonia nitrogen and residual oils are removed through ozone catalytic oxidation; optimally, the ozone catalytic oxidation reactor 5 adopts a three-stage series form, the total residence time is 24 h, and the single-stage height is 3 m;

[0044] 5) The wastewater treated by the ozone catalytic oxidation reactor 5 enters the adsorption reactor 6. At the same time, powdered activated carbon is added to the adsorption reactor 6, and the stirring device arranged in the adsorption reactor 6 is started to stir evenly. The dosing concentration of the added powdered activated carbon is 600 mg / L, and the residence time is 2 h; due to the strong adsorption capacity of the powdered activated carbon, the refractory dissolved organic matter not removed in the previous process can be removed through the adsorption of the powdered activated carbon, and the dosing amount of the powdered activated carbon can be adjusted in real time according to the influent water quality to adjust the treatment efficiency, and it has a strong ability to resist water quality fluctuations;

[0045] 6) The wastewater treated by the adsorption reactor 6 enters the secondary coagulation sedimentation tank 7. Inside the secondary coagulation sedimentation tank 7, there are successively arranged a coagulation zone, a flocculation zone, a sedimentation zone, and a discharge water tank. The wastewater first enters the coagulation zone, and a coagulant is added to the coagulation zone. The added coagulant is PAC, and the dosing concentration is 50 mg / L. At the same time, the coagulation stirring device in the coagulation zone is started to stir evenly. Then the wastewater enters the flocculation zone, and a flocculant is added to the flocculation zone. The added flocculant is PAM, and the dosing concentration is 1 mg / L. At the same time, the flocculation stirring device in the flocculation zone is started to stir evenly. Then the wastewater enters the sedimentation zone. After sedimentation treatment, the powdered activated carbon that has adsorbed organic pollutants and the remaining suspended solids in the previous adsorption reactor 6 are transformed into sludge and discharged from the bottom of the sedimentation zone, achieving the purpose of removing pollutants such as organic matter and the remaining suspended solids. The clear water enters the discharge water tank from the upper part of the sedimentation zone, and then is lifted to the circulation water tank 8 by a lift pump. The total residence time of the wastewater in the secondary coagulation sedimentation tank 7 is 12 h;

[0046] 7) The water treated by the secondary coagulation sedimentation tank 7 is lifted to the circulation water tank 8 by a wastewater lift pump. A circulating water lift pump is arranged in the circulation water tank 8, and the qualified circulating water is lifted to the carbon brick production waste gas scrubbing device 1 by the circulating water lift pump for circulating water supply.

[0047] In this embodiment, through a multi-stage physical and chemical combined process of tar / oil slick integrated treatment + primary coagulation sedimentation + deep oil removal filtration + ozone catalytic oxidation + powdered activated carbon adsorption + secondary coagulation sedimentation + recycling, the circulating water for carbon brick production waste gas scrubbing is treated, significantly reducing the concentration of pollutants in the circulating water, meeting the water quality requirements for recycling, and completely solving the environmental protection pain points and difficulties of production wastewater in the carbon brick production industry, which has great significance for protecting the ecological environment and the high-quality sustainable development of carbon brick production enterprises.

[0048] Optimizing the above embodiment, an overflow pipe is arranged at the water outlet of the primary coagulation sedimentation tank 3, which is respectively connected to the ozone catalytic oxidation reactor 5, the secondary coagulation sedimentation tank 7, and the circulation water tank 8. By detecting the water quality at the water outlet of the primary coagulation sedimentation tank 3, the water outlet of the primary coagulation sedimentation tank 3 can be directly introduced into the ozone catalytic oxidation reactor 5, the secondary coagulation sedimentation tank 7, or the circulation water tank 8, improving the treatment efficiency and saving the operating cost at the same time.

[0049] Embodiment Two

[0050] This embodiment provides a treatment system for the waste gas washing circulating water in carbon brick production, which includes a tar / skimmer integrated processor 2, a primary coagulation sedimentation tank 3, a deep oil removal filter 4, an ozone catalytic oxidizer 5, an adsorption reactor 6, a secondary coagulation sedimentation tank 7, and a circulation pool 8, which are connected in sequence along the water flow direction; the water outlet of the waste gas washing device 1 for carbon brick production is connected to the water inlet of the tar / skimmer integrated processor 2, and the water outlet of the circulation pool 8 is connected to the water inlet of the waste gas washing device 1 for carbon brick production. Optimally, a bypass pipe is also provided at the water outlet of the primary coagulation sedimentation tank 3, which is respectively connected to the ozone catalytic oxidizer 5, the secondary coagulation sedimentation tank 7, and the circulation pool 8.

[0051] The process flow of using this system to treat the waste gas washing circulating water in carbon brick production is as Figure 1 shown, and the specific process methods and parameters are detailed in Embodiment 1.

[0052] Meanwhile, the treatment system of this embodiment can be integrated into an integrated treatment skid-mounted device to reduce the floor area and installation difficulty.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A treatment method for the washing circulating water of waste gas in carbon brick production, characterized in that, it includes the following steps: 1) Return the washing circulating water of the waste gas washing device for carbon brick production to the tar / skimmer integrated processor, and remove the heavier tar and lighter skimmer by gravity at the same time; 2) The water treated by the tar / skimmer integrated processor enters the first-stage coagulation sedimentation tank, and a large amount of suspended matter is removed by coagulation sedimentation; 3) The wastewater treated by the first-stage coagulation sedimentation tank is lifted to the deep oil removal filter for deep oil removal; 4) The wastewater treated by the deep oil removal filter enters the ozone catalytic oxidation reactor, and most of the organic pollutants, ammonia nitrogen and residual oil are removed by ozone catalytic oxidation; 5) The wastewater treated by the ozone catalytic oxidation reactor enters the adsorption reactor, and powdered activated carbon is added to the adsorption reactor at the same time. The remaining organic pollutants are removed by the adsorption of powdered activated carbon; 6) The wastewater treated by the adsorption reactor enters the second-stage coagulation sedimentation tank, and the powdered activated carbon adsorbed with organic pollutants and the remaining suspended matter are removed by coagulation sedimentation; 7) The water treated by the second-stage coagulation sedimentation tank is lifted to the circulation water tank, and the water in the circulation water tank is used for circulating water supply to the waste gas washing device for carbon brick production.

2. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: In step 1), the residence time of the wastewater in the tar / skimmer integrated processor is 20 - 30h, and then the skimmer and the tar collection and discharge device are respectively used to remove the skimmer and tar through the skimmer scraping device arranged at the top of the tar / skimmer integrated processor and the tar collection device arranged at the bottom.

3. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: In step 2), after the wastewater enters the first-stage coagulation sedimentation tank, a coagulant and a flocculant are added in sequence and stirred. The dosing concentration of the coagulant is 50 - 150mg / L, and the dosing concentration of the flocculant is 1 - 2mg / L. After the coagulation and flocculation reaction, a large amount of suspended matter forms a precipitate and is discharged; the total residence time of the wastewater in the first-stage coagulation sedimentation tank is 12 - 14h.

4. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: An oil removal filter media is provided inside the deep oil removal filter, and the waste water is deeply deoiled by the oil removal filter media through filtration and adsorption; the oil removal filter media adopts walnut shell filter media, and the hydraulic load is 6-9m 3 / (m 2 ·h), and the filling height is 1.5-2.5m.

5. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: The ozone catalytic oxidation reactor adopts a three-stage series form, with a total residence time of 20 - 30h, a single-stage height of 3m, and each stage of the ozone catalytic oxidation reactor is provided with a catalyst and an ozone aeration device.

6. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 5, characterized in that: The filling rate of the catalyst is 40-80%, the catalyst uses an aluminum-silicon composite to support a metal oxide, the specific surface area is 200-250 m 2 / g, the particle size is 3-5 mm, and the ozone dosage of the ozone aeration device is 30-80 mg / L.

7. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: In step 5), the concentration of the powdered activated carbon added in the adsorption reactor is 500 - 700mg / L, and the residence time is 1.5 - 3h.

8. The treatment method for the washing circulating water of waste gas in carbon brick production according to claim 1, characterized in that: In step 6), after the wastewater enters the secondary coagulation sedimentation tank, a coagulant and a flocculant are added in sequence and stirred. The dosing concentration of the coagulant is 40-100 mg / L, and the dosing concentration of the flocculant is 1 mg / L. After the coagulation and flocculation reaction, the powdered activated carbon adsorbed with organic pollutants and the remaining suspended solids form a precipitate and are discharged; the total residence time of the wastewater in the secondary coagulation sedimentation tank is 12-14 h.

9. The treatment method of the waste gas washing circulating water for carbon brick production according to claim 1, characterized in that: An overflow pipe is arranged at the water outlet of the primary coagulation sedimentation tank and is respectively connected to the ozone catalytic oxidizer, the secondary coagulation sedimentation tank and the circulation pool.

10. A treatment system for waste gas washing circulating water for carbon brick production, characterized in that: It includes a tar / skimmer integrated processor, a primary coagulation sedimentation tank, a deep oil removal filter, an ozone catalytic oxidizer, an adsorption reactor, a secondary coagulation sedimentation tank, and a circulation pool connected in sequence along the water flow direction; the water outlet of the carbon brick production waste gas washing device is connected to the water inlet of the tar / skimmer integrated processor, and the water outlet of the circulation pool is connected to the water inlet of the carbon brick production waste gas washing device.

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