Treatment system for dinaphthol-containing wastewater

Abstract

The embodiment of the invention provides a treatment system for dinaphthol-containing wastewater. The treatment system for the dinaphthol-containing wastewater comprises a wastewater collection system, a pretreatment system, an oxidation precipitation system and a sludge treatment system. The wastewater collection system is used for collecting dinaphthol wastewater generated in chemical engineering; the pretreatment system comprises a communicated double-alkali hardness removal pool, the pretreatment system comprises a double-alkali hardness removal pool, and the double-alkali hardness removal pool is connected with a liquid outlet of the wastewater collection system; the oxidation precipitation system comprises an ozone air flotation system, an electric flocculation tank, a Fenton tank and a coagulative precipitation tank which are communicated in sequence; a liquid outlet of the double-alkali hardness removal tank is communicated with a liquid inlet of the ozone air flotation system; the electric flocculation tank, the coagulative precipitation tank and the Fenton tank are all communicated with the sludge treatment system so as to collect precipitates. Therefore, the treatment system for the dinaphthol-containing wastewater according to the embodiment of the invention has the advantages of improving the treatment efficiency of the wastewater and improving the treatment quality of the wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a treatment system for wastewater containing dinaphthol. Background Art

[0002] Dinaphthol, i.e. biphenyl diphenol, is an industrial product mainly 2,2-bis(4-hydroxyphenyl)propane.Dinaphthol is an important chemical raw material and chemical intermediate, and it has the characteristics of high temperature, high concentration, high acidity, high toxicity and difficult degradation.Due to the high boiling point, insoluble and unsaturated bond structure of dinaphthol, its waste water and waste residue belong to high concentration, difficult degradation, difficult to handle industrial three-dimensional organic pollutants.And after dinaphthol enters the environment, through the enrichment of the food chain, it is greatly harmful to the human body.

[0003] In the related art, biochemical method and physical and chemical treatment method are used to treat dinaphthol. The biochemical method is currently the most important and mature one, and can rely on microorganisms to achieve substance removal. However, due to the difficulty in degradation and unsaturated chemical structure of dinaphthol, the effect is not ideal through traditional biochemistry. The physical and chemical method mainly uses adsorption technology, using solid materials or surfactants to adsorb pollutants, mainly removing physical impurities and some polyaromatic organic matter, which is costly and cannot effectively degrade dinaphthol. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention proposes a treatment system for wastewater containing dinaphthol. The treatment system for wastewater containing dinaphthol treats the wastewater containing dinaphthol, and a multi-level treatment method improves the treatment quality of the wastewater, saves resources, reduces the amount of chemical reagents used, and reduces the amount of wastewater generated.

[0005] The treatment system for wastewater containing dinaphthol according to the embodiment of the present invention comprises a wastewater collection system, a pretreatment system, an oxidation precipitation system and a sludge treatment system.

[0006] The wastewater collection system is used to collect dinaphthol wastewater generated by the chemical industry; the pretreatment system includes a double alkali de-hardness removal tank, and the double alkali de-hardness removal tank is connected to the discharge port of the wastewater collection system; the oxidation precipitation system includes an ozone flotation system, an electric flocculation tank, a Fenton tank and a coagulation sedimentation tank connected in sequence, and the discharge port of the double alkali de-hardness removal tank is connected to the liquid inlet of the ozone flotation system.

[0007] The treatment system of the wastewater containing dinaphthol in the embodiment of the present invention is provided with a pretreatment system upstream of the oxidation precipitation system, and the pretreatment system is divided into a double alkali method hardness removal tank, and the heavy metal ions and phosphorus in the dinaphthol wastewater are removed by using the property of metal ions and phosphate radicals to form precipitation with alkali; the electrocoagulation tank and the Fenton tank can produce sodium hypochlorite by electrolysis of chloride ions in the sewage, and COD, benzene and grease are removed by strong oxidation, and the wastewater that is not completely oxidized under the action of the partial ozone system is purified, and the organic matter that is difficult to dissolve in water in the water can be oxidized at the same time, so that the organic matter in the water can be degraded, and the hardness components and some organic matter in the wastewater are effectively removed. When the oxidation precipitation treatment is carried out, the pretreated wastewater helps to reduce the amount of chemical reagents used and improves the wastewater treatment efficiency.

[0008] At the same time, dividing the oxidation sedimentation system into ozone flotation system, electrocoagulation tank, Fenton tank and coagulation sedimentation tank and other equipment is helpful to achieve deep treatment of wastewater. It has been proven that the content of dinaphthol can be reduced from 35000 mg / l to below 350 mg / L, which greatly reduces the content of dinaphthol in the wastewater and meets the reuse standards, which is conducive to the recycling of water resources.

[0009] Therefore, the treatment system for wastewater containing dinaphthol according to the embodiment of the present invention has the advantages of reducing the amount of reagents used, improving the treatment efficiency of wastewater and improving the treatment quality of wastewater.

[0010] In some embodiments, the ozone flotation system includes an ozone tank and an ozone generator. The bottom of the ozone tank is connected to the ozone generator, and the ozone generator can strongly oxidize dinaphthol to form a primary oxidation tank; the electric flocculation tank is provided with an aeration device, and the aeration device is used to generate iron flocs to form secondary strong oxidation of dinaphthol; the Fenton tank is provided with a H2O2 dosing device to strongly oxidize dinaphthol tertiarily.

[0011] In some embodiments, the electric flocculation tank, the Fenton tank and the coagulation sedimentation tank are all provided with acid dosing devices and alkali dosing devices for adjusting the pH value of the wastewater. The pH of the wastewater in the Fenton tank is adjusted to 3-5, and the pH of the wastewater in the electric flocculation tank and the coagulation sedimentation tank is neutral.

[0012] In some embodiments, the dual alkali dehardness pool has a lime adding device and a soda adding device.

[0013] In some embodiments, the electrocoagulation cell includes a cathode region and an anode region, a titanium substrate electrode is provided in the cathode cell, a titanium-nickel-based titanium plate electrode is provided in the anode region, and a cationic membrane is provided between the anode region and the titanium substrate electrode.

[0014] In some embodiments, the titanium nickel-based titanium plate electrode is a sheet-shaped electrode plate, and the thickness of the sheet-shaped electrode plate is 150 μm.

[0015] In some embodiments, the ozone tank includes a top baffle layer and a drain port, the top baffle layer is in the shape of a cone, the drain port is disposed on a side of the ozone tank, and the bottom of the cone is connected to the drain port.

[0016] In some embodiments, an electric heater and an ultraviolet lamp are provided in the Fenton cell.

[0017] In some embodiments, the ozone flotation system further includes a cooling device, an ozone bubbling tube and a microporous distributor, the ozone generator is connected to the microporous distributor through the ozone bubbling tube, and the microporous distributor is arranged in multiple rows and columns in an area near the bottom of the ozone tank.

[0018] In some embodiments, the coagulation sedimentation tank also includes a reagent dosing device and a stirring device. The coagulation sedimentation tank is connected to the discharge port of the Fenton tank. The reagent is arranged in the reagent dosing device. The coagulation sedimentation tank is connected to the reagent dosing device. The stirring device is used to fully mix the reagent with the wastewater.

[0019] In some embodiments, the wastewater in the wastewater collection system contains more than 30,000 mg / L of dinaphthol, 16,000-25,000 mg / L of sodium naphthalenesulfonate, 34-38 g / L of sodium sulfite, and 55-60 g / L of sodium sulfate.

[0020] In some embodiments, the agent includes a coagulant and a coagulant aid, the coagulant is one of polyiron and polyaluminum, and the coagulant aid is polyacrylamide.

[0021] In some embodiments, the wastewater collection system includes a collection pipe, a grid, a regulating tank and a lift pump, the grid is arranged at the front end of the inlet of the regulating tank, and the outlet end of the collection pipe is located on the side of the grid away from the regulating tank; the lift pumps are all arranged in the regulating tank, and the output end of the lift pump is connected to the pretreatment system.

[0022] In some embodiments, the pretreatment system further includes a grid and a grease trap, wherein the grid is disposed on the grease trap, and the grease trap is disposed upstream of the dual-alkali dehardness removal tank.

[0023] In some embodiments, the sludge treatment system includes a sludge tank, a sludge thickening tank and a sludge dewatering device which are connected in sequence, and the bottoms of the electric flocculation tank, the Fenton tank and the coagulation sedimentation tank are all connected to the sludge tank through a sludge discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flowchart of a system for treating wastewater containing dinaphthol according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Collection pipe 11; grid (not shown); regulating tank 12; lifting pump 13;

[0027] Double alkali de-hardness pool 21; lime adding device 22; soda adding device 23;

[0028] Ozone flotation system 31; electrocoagulation tank 32; Fenton tank 33; coagulation sedimentation tank 34; reagent dosing device 341; stirring device 342;

[0029] Sludge treatment system4. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] Reference below Figure 1 The treatment system of the wastewater containing dinaphthol according to the embodiment of the present invention is described. Further, the wastewater containing dinaphthol can be industrial wastewater used in coal chemical industry.

[0032] The treatment system for wastewater containing dinaphthol according to the embodiment of the present invention comprises a wastewater collection system, a pretreatment system, an oxidation precipitation system and a sludge treatment system 4 .

[0033] The wastewater collection system is used to collect dinaphthol wastewater generated by the chemical industry; the pretreatment system includes a connected double alkali de-hardening tank 21, and the discharge port of the wastewater collection system is connected to the double alkali de-hardening tank 21; the oxidation precipitation system includes an ozone flotation system 31, an electric flocculation tank 32, a Fenton tank 33 and a coagulation sedimentation tank 34 connected in sequence, the discharge port of the double alkali de-hardening tank 21 is connected to the liquid inlet of the ozone flotation system 31, and the electric flocculation tank 32, the coagulation sedimentation tank 34 and the Fenton tank 33 are all connected to the sludge treatment system 4 to collect the precipitate.

[0034] The treatment system of the wastewater containing dinaphthol in the embodiment of the present invention is provided with a pretreatment system upstream of the oxidation precipitation system, and the pretreatment system is divided into a double alkali method hardness removal tank, and the heavy metal ions and phosphorus in the dinaphthol wastewater are removed by utilizing the property of metal ions and phosphate radicals to form precipitation with alkali; at the same time, the organic matter insoluble in water in the water is oxidized to degrade the organic matter in the water, and the hardness components and part of the organic matter in the wastewater are effectively removed. When the oxidation precipitation treatment is carried out, the pretreated wastewater helps to reduce the amount of chemical reagents used and improves the wastewater treatment efficiency.

[0035] At the same time, the oxidation precipitation system is divided into ozone flotation system 31, electric flocculation tank 32, Fenton tank 33 and coagulation sedimentation tank 34, which is helpful to achieve deep treatment of wastewater. It has been verified that the content of dinaphthol in wastewater is reduced from 35000mg / l to below 350mg / L, which greatly reduces the content of dinaphthol in wastewater, meets the wastewater reuse standard, and is conducive to the recycling of water resources. After the wastewater is treated, it meets the requirements of the MVR evaporation system, and the replacement cycle of the wastewater is extended from the original 3 days to 13 days.

[0036] Therefore, the treatment system for wastewater containing dinaphthol according to the embodiment of the present invention has the advantages of reducing the amount of reagents used, improving the treatment efficiency of wastewater and improving the treatment quality of wastewater.

[0037] Specifically, the present invention adopts a double alkali method hardness removal pool treatment unit to pre-treat the phenolic organic matter in the dinaphthol wastewater, remove most of the chemical oxygen demand (COD), phenols and other pollutants in the wastewater, and then adopts ozone flotation, Fenton tank 33, electric flocculation tank 32 and other treatment units to deeply treat the dinaphthol wastewater, greatly reducing the subsequent treatment efficiency.

[0038] The bottom of the ozone flotation system 31 is connected to an ozone generator, which can strongly oxidize dinaphthol to form a primary oxidation pool; the electric flocculation tank 32 is provided with an aeration device, which is used to generate iron flocs to form secondary strong oxidation of dinaphthol; the Fenton tank 33 is provided with a H2O2 dosing device to strongly oxidize dinaphthol for the third time.

[0039] The treatment system of the wastewater containing dinaphthol in the embodiment of the present invention treats high dinaphthol by ozone oxidation-electroflocculation-Fenton-coagulation precipitation. The ozone flotation strongly oxidizes dinaphthol, which is the primary oxidation of benzene rings. The iron flocs generated in the secondary strong oxidation process of electroflocculation can strongly oxidize dinaphthol again, which is the secondary oxidation of benzene rings. At the same time, the electroflocculation further removes pollutants such as suspended matter and oils. The generated Fe 2+ +Fe 3+ Enter the Fenton tank 33. The oxidized wastewater can reduce the input of iron salts, and because of the first two strong oxidations, the amount of H2O2 added in the Fenton tank 33 can be reduced.

[0040] Moreover, ozone is a strong oxidant, its redox potential in water is 2.07V, second only to fluorine (2.5V), and its oxidizing ability is higher than chlorine (1.36V) and chlorine dioxide (1.5V), which can destroy the cell wall of bacteria, diffuse into the cells quickly, and oxidize and decompose glucose oxidase, which is necessary for the oxidation of glucose in bacteria. It can also directly react with bacteria and viruses, destroy cells, ribonucleic acid (RNA), decompose macromolecular polymers such as deoxyribonucleic acid (DNA), RNA, proteins, lipids and polysaccharides, and destroy the metabolism and reproduction process of bacteria.

[0041] Specifically, in the Fenton tank 33, after the third strong oxidation of dinaphthol by Fenton, a coagulant is added for coagulation and precipitation. This is the third oxidation of benzene rings, and the iron mud / iron flocs produced by Fenton also serve as a flocculant, thereby reducing the amount of coagulant added.

[0042] Moreover, the dinaphthol in the wastewater of the present invention undergoes three strong oxidations, wherein ozone strong oxidation dephosphorization, electrocoagulation dephosphorization, Fenton strong oxidation dephosphorization and chemical dephosphorization ensure that phosphorus meets the standard, thereby reducing investment, which is only one-third of conventional treatment processes and equipment. Therefore, the treatment system for wastewater containing dinaphthol in the embodiment of the present invention has the advantages of good treatment effect, strong applicability and good economic feasibility.

[0043] Optionally, the ozone flotation system 31 includes a cooling device, an ozone bubbling tube and a microporous distributor, and the ozone generator is connected to the microporous distributor through the ozone bubbling tube, and the microporous distributor is arranged in multiple rows and columns in the area near the bottom of the ozone pool. Thus, the bubbles can be made more uniform, which helps to increase the contact area between the gas and the liquid, thereby increasing the mass transfer rate. The treatment system of the wastewater containing dinaphthol further improves the efficiency of particle coagulation. In addition, heat is released during the conversion of oxygen into ozone, and the heat must be taken away by cooling water of the cooling device (the generator water chamber of the grounding electrode) to promote the conversion efficiency of ozone.

[0044] The electrocoagulation tank 32, Fenton tank 33 and coagulation sedimentation tank 34 are all provided with acid and alkali dosing devices for adjusting the pH value of the wastewater. The pH of the wastewater in the Fenton tank 33 is adjusted to 3-5, and the pH of the wastewater in the electrocoagulation tank 32 and coagulation sedimentation tank 34 is neutral.

[0045] The treatment system of the wastewater containing dinaphthol in the embodiment of the present invention can make the flocculant play the best flocculation effect by adjusting the pH of the wastewater in the electrocoagulation tank 32 and the coagulation sedimentation tank 34 to neutral, avoiding the problem that the over-acidic or over-alkaline environment may not be able to effectively adsorb and aggregate fine particles and may have a poor flocculation effect. Therefore, the treatment system of the wastewater containing dinaphthol is used to increase the reaction rate and enhance the treatment effect.

[0046] In addition, the pH of the wastewater in the Fenton pool 33 was adjusted to the range of 3 to 5. The hydroxyl radicals (·OH) generated in the Fenton reaction had higher activity and stability, which could avoid the excessively high pH value leading to Fe 3+ With OH - The combination forms an insoluble iron hydroxide precipitate, thereby reducing the effective concentration of ferrous ions and inhibiting the Fenton reaction. Therefore, the treatment system for wastewater containing dinaphthol can significantly improve the removal efficiency of organic pollutants by the Fenton reaction, while also helping to reduce the consumption of chemical agents and optimize the overall treatment cost.

[0047] The double alkali dehardening pool 21 has a lime adding device 22 and a soda adding device 23 .

[0048] When the system is running, lime emulsion is first added to the wastewater. The lime reacts with calcium bicarbonate (Ca(HCO3)2) and magnesium bicarbonate (Mg(HCO3)2) in the water to produce water-insoluble calcium carbonate (CaCO3) and magnesium hydroxide. After the lime treatment is completed, in order to further reduce the residual hardness in the water (mainly calcium ions that have not been completely removed), an appropriate amount of baking soda (soda ash) will be added. Soda reacts with the remaining calcium ions to produce a more insoluble calcium carbonate precipitate. After these two steps, most of the hardness ions will be converted into insoluble precipitates, which are then separated from the water by physical methods such as precipitation and filtration, thereby achieving the purpose of softening the water quality. In addition, the pH value of the wastewater can also be adjusted to make it more suitable for subsequent treatment or discharge requirements.

[0049] The wastewater in the wastewater collection system contains dinaphthol greater than 30000mg / L, sodium naphthalenesulfonate 16000-25000 mg / L, sodium sulfite 34-38 g / L, and sodium sulfate 55-60 g / L. Because the dinaphthol of relatively high concentration is difficult to handle, the process is also complicated. Conventional biochemical method and physical and chemical treatment are difficult to achieve the effect. The method of combining various methods adopted by the present invention can handle high-concentration dinaphthol. The present invention can simultaneously remove harmful substances therein.

[0050] The electrocoagulation cell 32 comprises a cathode region and an anode region. A titanium substrate electrode is arranged in the cathode cell, a titanium-nickel-based titanium plate electrode is arranged in the anode region, and a cationic membrane is arranged between the anode region and the titanium substrate electrode.

[0051] The treatment system for wastewater containing dinaphthol in the embodiment of the present invention comprises an electro-flocculation tank 32 including a cathode region and an anode region, and the electro-flocculation combines the four functions of electro-oxidation, electro-reduction, electro-flotation and electro-flocculation into one, which can not only remove grease, suspended matter, etc. in the wastewater, but also remove organic matter, heavy metals and phosphorus in the wastewater. At the same time, the high salinity in the wastewater is conducive to the electro-flocculation, thereby reducing the energy consumption used for the electro-flocculation.

[0052] In addition, both the titanium substrate and the titanium-nickel-based titanium plate as electrode materials have good conductivity, which can promote the electron transfer process in the electrochemical reaction, thereby improving the reaction efficiency of the entire system.

[0053] The titanium-nickel-based titanium plate electrode is a sheet-shaped electrode plate, and the thickness of the sheet-shaped electrode plate is 150 μm.

[0054] The treatment system for wastewater containing dinaphthol in the embodiment of the present invention increases the electrode surface area per unit volume by setting the titanium nickel-based titanium plate as a sheet structure, thereby improving the efficiency of the electrochemical reaction. The larger surface area of ​​the electrode plate means more active sites available for the reaction to occur, which is particularly important in wastewater treatment (such as electrocoagulation), electrolysis processes and battery technology.

[0055] Sheet-shaped electrode plates usually have good planarity and flatness, which ensures that the current is evenly distributed across the entire electrode surface. This uniformity helps avoid problems such as local overheating or incomplete reaction, and improves overall performance and safety.

[0056] An electric heater and an ultraviolet lamp are provided in the Fenton pool 33. Since the Fenton reaction rate is sensitive to temperature, increasing the temperature within a suitable temperature range (usually 20-40° C.) can accelerate the reaction rate and improve the efficiency of organic matter degradation. The electric heater can accurately control the water temperature to ensure that the reaction is carried out under optimal conditions.

[0057] Moreover, ultraviolet irradiation and the effect of Fenton's reagent use ultraviolet light to activate hydrogen peroxide (H2O2) to produce more hydroxyl radicals (·OH), thereby enhancing the oxidation capacity and improving the removal rate of pollutants. And due to the presence of ultraviolet light, the same treatment effect can be achieved at a lower H2O2 concentration, thereby reducing the use of chemical agents, reducing costs and reducing the risk of secondary pollution.

[0058] The coagulation sedimentation tank 34 further includes a reagent dosing device 341 and a stirring device 342. The coagulation sedimentation tank 34 is connected to the discharge port of the Fenton tank 33. The reagent dosing device 341 is provided with reagents. The coagulation sedimentation tank 34 is connected to the reagent dosing device 341. The stirring device 342 is used to fully mix the reagents with the wastewater. Furthermore, the treatment system for wastewater containing dinaphthol in the embodiment of the present invention improves the efficiency of flocculation reaction.

[0059] Optionally, a stirrer is provided in the coagulation and sedimentation tank, a pressure sensor is installed above the stirrer, the stirrer is retractable, four stirrer arms are evenly arranged on the telescopic rod of the stirrer, and stirring blades are installed on the stirrer arms. Therefore, the treatment system for wastewater containing dinaphthol in the embodiment of the present invention has the advantage of simple structure.

[0060] Optionally, the reagent includes a coagulant and a coagulant aid, the coagulant is one of polyiron and polyaluminum, and the coagulant aid is polyacrylamide.

[0061] The wastewater collection system includes a collection pipe 11, a grid, a regulating tank 12 and a lifting pump 13. The grid is arranged at the front end of the entrance of the regulating tank 12, and the outlet end of the collection pipe 11 is located on the side of the grid away from the regulating tank 12; the lifting pump 13 is arranged in the regulating tank 12, and the output end of the lifting pump 13 is connected to the pretreatment system. Then, impurities in the wastewater can be pre-filtered. Therefore, the treatment system of the wastewater containing dinaphthol in the embodiment of the present invention has the advantages of simple structure and good treatment effect.

[0062] The pretreatment system further includes a grid and a grease trap. The grid is arranged on the grease trap, and the grease trap is arranged upstream of the double alkali de-hardness tank 21 .

[0063] The treatment system for wastewater containing dinaphthol in the embodiment of the present invention is mainly used to remove floating oil and part of suspended solids contained in the wastewater through the grease trap, thereby reducing the burden of subsequent treatment units and improving the overall treatment efficiency. After grease enters the biological treatment system, it may form a film covering the surface of microorganisms, hindering the transfer of oxygen, affecting the activity of microorganisms, and causing a decrease in the treatment effect. The grease trap can effectively remove most of the grease and ensure the efficient operation of the subsequent treatment units.

[0064] The sludge treatment system 4 includes a sludge tank, a sludge thickening tank and a sludge dewatering device which are connected in sequence. The bottoms of the electric flocculation tank 32, the Fenton tank 33 and the coagulation sedimentation tank 34 are all connected to the sludge tank through a sludge discharge pipe.

[0065] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A treatment system for wastewater containing dinaphthol, characterized in that: include: A wastewater collection system, wherein the wastewater collection system is used to collect dinaphthol wastewater; A pretreatment system, the pretreatment system comprising a double alkali de-hardening tank, and the double alkali de-hardening tank is connected to the drain outlet of the wastewater collection system; An oxidation precipitation system, wherein the oxidation precipitation system comprises an ozone flotation system, an electric flocculation tank, a Fenton tank and a coagulation sedimentation tank which are connected in sequence, and the discharge port of the double alkali de-hardness tank is connected to the liquid inlet of the ozone flotation system; The sludge treatment system, the electric flocculation tank, the coagulation sedimentation tank and the Fenton tank are all connected to the sludge treatment system to collect the sediment.

2. The treatment system for wastewater containing dinaphthol according to claim 1, characterized in that: The ozone flotation system comprises an ozone tank and an ozone generator. The bottom of the ozone tank is connected to the ozone generator, and the ozone generator can strongly oxidize dinaphthol to form a primary oxidation tank; the electric flocculation tank is provided with an aeration device, and the aeration device is used to generate iron flocs to form secondary strong oxidation of dinaphthol; the Fenton tank is provided with a H2O2 dosing device to strongly oxidize dinaphthol for a third time.

3. The treatment system for wastewater containing dinaphthol according to claim 2, characterized in that: The electric flocculation tank, the Fenton tank and the coagulation sedimentation tank are all provided with an acid dosing device and an alkali dosing device for adjusting the pH value of the wastewater. The pH value of the wastewater in the Fenton tank is adjusted to 3-5, and the pH value of the wastewater in the electric flocculation tank and the coagulation sedimentation tank is neutral. And / or, the ozone tank comprises a top baffle layer and a sewage outlet, the top baffle layer is in the shape of a cone, the sewage outlet is arranged on the side of the ozone tank, and the bottom of the cone is connected to the sewage outlet.

4. The treatment system for wastewater containing dinaphthol according to claim 3, characterized in that: The double alkali de-hardness pool is provided with a lime adding device and a soda adding device; The electric flocculation cell comprises a cathode region and an anode region. A titanium substrate electrode is arranged in the cathode cell, a titanium-nickel-based titanium plate electrode is arranged in the anode region, and a cationic membrane is arranged between the anode region and the titanium substrate electrode.

5. The treatment system for wastewater containing dinaphthol according to claim 4, characterized in that: The titanium-nickel-based titanium plate electrode is a sheet-shaped electrode plate, and the thickness of the sheet-shaped electrode plate is 150 μm; And / or, an electric heater and an ultraviolet lamp are provided in the Fenton pool; And / or, the ozone flotation system further comprises a cooling device, an ozone bubbling tube and a microporous distributor, the ozone generator is connected to the microporous distributor via the ozone bubbling tube, and the microporous distributor is arranged in multiple rows and columns in an area near the bottom of the ozone tank.

6. The treatment system for wastewater containing dinaphthol according to claim 1, characterized in that: The coagulation sedimentation tank further comprises a reagent dosing device and a stirring device. The coagulation sedimentation tank is connected to the discharge port of the Fenton tank. The reagent dosing device is provided with reagents. The coagulation sedimentation tank is connected to the reagent dosing device. The stirring device is used to fully mix the reagents with the wastewater. And / or, the wastewater in the wastewater collection system contains more than 30,000 mg / L of dinaphthol, 16,000-25,000 mg / L of sodium naphthalenesulfonate, 34-38 g / L of sodium sulfite and 55-60 g / L of sodium sulfate.

7. The treatment system for wastewater containing dinaphthol according to claim 6, characterized in that: The agent comprises a coagulant and a coagulant aid, wherein the coagulant is one of polyferric and polyaluminum, and the coagulant aid is polyacrylamide.

8. The treatment system for wastewater containing dinaphthol according to claim 1, characterized in that: The wastewater collection system includes a collection pipe, a grid, a regulating tank and a lifting pump. The grid is arranged at the front end of the inlet of the regulating tank, and the outlet end of the collection pipe is located on the side of the grid away from the regulating tank; the lifting pumps are all arranged in the regulating tank, and the output end of the lifting pump is connected to the pretreatment system.

9. The treatment system for wastewater containing dinaphthol according to claim 1, characterized in that: The pretreatment system further comprises a grid and a grease trap, wherein the grid is arranged on the grease trap, and the grease trap is arranged upstream of the double alkali de-hardness removal tank.

10. The treatment system for wastewater containing dinaphthol according to claim 1, characterized in that: The sludge treatment system comprises a sludge pool, a sludge concentration pool and a sludge dewatering device which are connected in sequence. The bottoms of the electric flocculation pool, the Fenton pool and the coagulation sedimentation pool are all connected to the sludge pool through a sludge discharge pipe.

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