High concentration metal wastewater treatment system

Abstract

The utility model provides a kind of high concentration metal wastewater treatment system, comprising: wastewater pool, for storing high concentration metal wastewater;Adjustment pool, water is communicated between the wastewater pool by pipeline, for the PH value adjustment of high concentration metal wastewater, forms acidic first intermediate wastewater;Micro electrolytic cell, water is communicated between the adjustment pool by pipeline, for the micro electrolysis of first intermediate wastewater, forms second intermediate wastewater;Chemical oxidation pool, water is communicated with the micro electrolytic cell by pipeline, for the oxidation decomposition of second intermediate wastewater, forms third intermediate wastewater;Sedimentation tank, water is communicated between the chemical oxidation pool by pipeline, for the sedimentation treatment of third intermediate wastewater, forms fourth intermediate wastewater;Chlorination tank, water is communicated with the sedimentation tank by pipeline, for the fold point chlorination treatment of fourth intermediate wastewater;Clean water pool, for the storage of clean water after processing is completed.The high concentration metal wastewater treatment system in the scheme can effectively treat high concentration metal wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a high-concentration metal wastewater treatment system. Background Technology

[0002] Common methods for treating high-concentration metal wastewater include chemical precipitation, electrolysis, and ion exchange. However, electrolysis consumes high amounts of electricity and metals in the electrodes when treating large volumes of wastewater, and the separated precipitates are difficult to treat and can easily generate toxic gases. Ion exchange uses organic framework ion exchange resins, which can effectively remove various harmful ions from wastewater, but it requires large amounts of resin, has difficult regeneration solution treatment, and consumes large amounts of acids and alkalis, significantly increasing treatment costs. Chemical precipitation requires the addition of large amounts of iron salts and polyaluminum chloride, increasing the salinity of the discharged water and making it difficult to meet standards for residual metal ions. To meet these standards, chemical reagents are needed, further increasing costs.

[0003] For the reasons mentioned above, the wastewater treatment process for high-concentration metal wastewater has changed, resulting in existing high-concentration metal wastewater treatment systems being unable to meet the requirements of the new wastewater treatment process. Summary of the Invention

[0004] This invention provides a high-concentration metal wastewater treatment system to solve the above-mentioned problems.

[0005] This utility model provides a high-concentration metal wastewater treatment system, the high-concentration metal wastewater treatment system comprising:

[0006] Wastewater ponds are used to store wastewater with high concentrations of metals.

[0007] The equalization tank is connected to the wastewater tank by a pipeline and is used to adjust the pH value of the high-concentration metal wastewater to form an acidic first intermediate wastewater.

[0008] A micro-electrolysis cell is connected to the equalization tank by a pipeline, which is used to perform micro-electrolysis on the first intermediate wastewater to form a second intermediate wastewater.

[0009] A chemical oxidation tank, connected to the micro-electrolysis tank via a pipeline, is used to oxidize and decompose the second intermediate wastewater to form a third intermediate wastewater;

[0010] A sedimentation tank is connected to the chemical oxidation tank by a pipeline for water flow, which is used to treat the third intermediate wastewater by sedimentation to form a fourth intermediate wastewater;

[0011] A chlorination tank, connected to the sedimentation tank via a pipeline, is used to treat the fourth intermediate wastewater by inflection point chlorination.

[0012] A clear water tank is used to store the treated clear water.

[0013] In one embodiment of this utility model, the high-concentration metal wastewater treatment system further includes:

[0014] An oxidation buffer tank, connected by a pipeline between the chemical oxidation tank and the sedimentation tank, is used to stir and mix the introduced third intermediate wastewater, and then input the stirred and mixed third intermediate wastewater into the sedimentation tank.

[0015] In one embodiment of the present invention, an aeration device is provided in the oxidation buffer tank. The aeration device is used to perform air aeration to stir and mix the introduced third intermediate wastewater.

[0016] In one embodiment of the present invention, the sedimentation tank includes:

[0017] The first sedimentation tank is connected to the chemical oxidation tank by a pipeline for water flow, which is used to treat the third intermediate wastewater by sedimentation to generate the first precipitate and the first supernatant.

[0018] The second sedimentation tank is connected to the first sedimentation tank by a pipeline and is used to precipitate the first supernatant to generate a second precipitate and a second supernatant. The second supernatant is the fourth intermediate wastewater.

[0019] In one embodiment of this utility model, a dechlorination tank is connected to the chlorination tank and the clear water tank via a pipeline. The dechlorination tank is used to reduce the chlorine in the chlorination tank that has not undergone complete reaction.

[0020] In one embodiment of the present invention, an ultrafiltration tank is further provided between the dechlorination tank and the clear water tank. The ultrafiltration tank is used to filter the water output from the dechlorination tank, and the clear water tank is used to store the clear water obtained after filtration by the ultrafiltration tank.

[0021] In one embodiment of the present invention, the high-concentration metal wastewater treatment system further includes a filter press, which is used to dewater the first precipitate, the second precipitate, and the filtration residue of the ultrafiltration tank.

[0022] In one embodiment of the present invention, the high-concentration metal wastewater treatment system further includes a detection component, which is used to detect various index parameters during the high-concentration metal wastewater treatment process.

[0023] In one embodiment of the present invention, the microelectrolysis cell includes a cell body and an anode and a cathode disposed within the cell body.

[0024] In one embodiment of the present invention, a filter element is provided in the ultrafiltration tank, and the filter element is an ultrafiltration ceramic flat sheet membrane.

[0025] This utility model also provides a high-concentration metal wastewater treatment system, the high-concentration metal wastewater treatment system comprising:

[0026] The beneficial effects of this utility model are as follows: This utility model proposes a high-concentration metal wastewater treatment system. High-concentration metal wastewater is stored in a wastewater tank, and its pH value is adjusted in an equalization tank until it reaches 2.5-3, forming a first intermediate wastewater, which then enters a micro-electrolysis tank. The micro-electrolysis tank performs micro-electrolysis on the first intermediate wastewater to form a second intermediate wastewater. During the wastewater treatment process in the micro-electrolysis tank, the structure and properties of many organic substances in the wastewater are altered, achieving the purpose of degrading organic matter. The micro-electrolyzed water contains a large amount of Fe. 2+ This process saves on the reagent cost of ferrous ions in the chemical oxidation process, while simultaneously generating Fe(OH)3 with flocculation and adsorption functions, further improving wastewater treatment efficiency. After the third intermediate wastewater enters the chemical oxidation tank, large organic molecules in the wastewater undergo advanced oxidation reactions, transforming into smaller organic molecules or being directly mineralized into inorganic substances such as carbon dioxide and water. It also removes nitrate and sulfate ions, causing nickel ions to form tiny flocs for easier subsequent treatment. The acidic wastewater after micro-electrolysis has a slightly increased pH, effectively reducing the cost of adding alkali later. The sedimentation tank is used to settle the third intermediate wastewater output from the chemical oxidation tank to obtain the supernatant (i.e., the fourth intermediate wastewater). The chlorination tank further removes pollutants such as COD and ammonia nitrogen through breakpoint chemical oxidation, ensuring the discharged water meets discharge standards. The clear water tank is used to store the clear water. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of a high-concentration metal wastewater treatment system provided in an embodiment of the present invention.

[0030] The attached figures are labeled as follows:

[0031] Wastewater tank 201, equalization tank 202, micro-electrolysis tank 203, chemical oxidation tank 204, oxidation buffer tank 205, sedimentation tank 206, chlorination tank 207, dechlorination tank 208, ultrafiltration tank 209, clear water tank 210, filter press 211. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0035] First, some of the technical names used in this application will be explained as follows:

[0036] Macromolecules typically refer to compounds with large molecular weights, generally composed of tens of thousands of atoms, and have long polymer chains and complex molecular structures.

[0037] For example, macromolecular organics refer to organic compounds with complex structures that are difficult to biodegrade or chemically oxidize, and whose molecular weight may be as high as thousands or even tens of thousands of Daltons (Da).

[0038] Secondly, small molecules refer to compounds with relatively small molecular weights, typically composed of fewer atoms and having relatively simple molecular structures. Small molecule compounds often exhibit faster reaction rates in chemical reactions. In wastewater treatment, small molecule organic matter may refer to organic matter with relatively simple structures that is easily biodegraded or chemically oxidized, with molecular weights potentially ranging from tens to hundreds of Daltons (Da).

[0039] Please see Figure 1 As shown, an embodiment of the present invention provides a high-concentration metal wastewater treatment system, comprising:

[0040] Wastewater pond 201 is used to store high-concentration metal wastewater;

[0041] The equalization tank 202 is connected to the wastewater tank 201 by a pipeline, which is used to adjust the pH value of the high-concentration metal wastewater to form acidic first intermediate wastewater;

[0042] The micro-electrolysis cell 203 is connected to the equalization tank 202 by a pipeline, which is used to perform micro-electrolysis on the first intermediate wastewater to form the second intermediate wastewater.

[0043] The chemical oxidation tank 204 and the micro-electrolysis tank 203 are connected by a pipeline to oxidize and decompose the second intermediate wastewater to form the third intermediate wastewater.

[0044] Sedimentation tank 206 is connected to chemical oxidation tank 204 by a pipeline for sedimentation treatment of the third intermediate wastewater to form the fourth intermediate wastewater;

[0045] Chlorination tank 207 is connected to sedimentation tank 206 by a pipeline for the inflection point chlorination treatment of the fourth intermediate wastewater.

[0046] Clear water tank 210 is used to store the treated clear water.

[0047] For example, high-concentration metal wastewater can be nickel-iron wastewater, chromium-containing wastewater, or copper-containing wastewater. Among them, nickel-iron wastewater can be hydrogen production wastewater, electroplating wastewater, or smelting wastewater, etc., which contain high concentrations of nickel-iron.

[0048] It is worth noting that nickel is a toxic heavy metal that poses potential hazards to human health and the ecological environment. High-concentration nickel-iron wastewater must be treated to meet standards before it can be discharged. Furthermore, nickel is chemically reactive and readily forms strong cationic nickel (Ni... 2+ The presence of nickel ions in wastewater makes wastewater treatment difficult. Furthermore, high-concentration nickel-iron wastewater contains not only nickel ions but also iron ions, other heavy metal ions, organic matter, acids, and alkalis, making its composition complex and further increasing the difficulty of wastewater treatment.

[0049] In this embodiment, taking high-concentration nickel-iron wastewater as an example, the high-concentration metal wastewater is stored in wastewater tank 201, and the pH value of the high-concentration metal wastewater is adjusted in regulating tank 202. After the pH reaches 2.5-3, the first intermediate wastewater is formed and enters micro-electrolysis tank 203. Micro-electrolysis tank 203 performs micro-electrolysis on the first intermediate wastewater to form second intermediate wastewater. During the wastewater treatment process in micro-electrolysis tank 203, the structure and properties of many organic substances in the wastewater are changed, achieving the purpose of degrading organic matter; the micro-electrolyzed water contains a large amount of Fe. 2+This process saves on the reagent cost of ferrous ions in the chemical oxidation process, while simultaneously generating Fe(OH)3 with flocculation and adsorption functions, further improving wastewater treatment efficiency. After the third intermediate wastewater enters the chemical oxidation tank 204, the large organic molecules in the wastewater undergo advanced oxidation reactions, transforming them into smaller organic molecules or directly mineralizing them into inorganic substances such as carbon dioxide and water. It also removes nitrate and sulfate ions, causing nickel ions to form tiny flocs for easier subsequent treatment. The acidic wastewater after micro-electrolysis has a slightly increased pH, effectively reducing the cost of adding alkali later. The sedimentation tank 206 is used to settle the third intermediate wastewater output from the chemical oxidation tank 204 to obtain the supernatant (i.e., the fourth intermediate wastewater). The chlorination tank 207 further removes pollutants such as COD and ammonia nitrogen through breakpoint chlorination chemical oxidation, ensuring that the discharged water meets discharge standards. The clear water tank 210 is used to store the clear water.

[0050] For example, the clear water tank 210 and the chlorination tank 207 are connected by a pipe. If the water in the clear water tank 210 still cannot meet the discharge standards, the clear water in the clear water tank 210 is introduced into the chlorination tank 207 for a second reaction.

[0051] It should also be noted that micro-electrolysis is an effective process for treating wastewater by utilizing the principle of metal corrosion to form a galvanic cell. Without applying electricity, it uses the high and low potential differences generated by the micro-electrolysis material filled in the wastewater to electrolyze the wastewater, thereby degrading organic pollutants. In slightly acidic wastewater, the nascent hydrogen produced by the electrode reaction can undergo redox reactions with the organic and inorganic components in the wastewater, destroying chromophores and even breaking down polymer chains, thus achieving decolorization. Iron is a reactive metal and can reduce certain nitro compounds to biodegradable amine compounds under acidic conditions. The ferric and ferrous ions generated by electrolysis, after hydrolysis and polymerization, form ferric hydroxide and ferrous hydroxide polymers, which exist in colloidal form and have precipitation, flocculation, and adsorption effects. They flocculate together with pollutants to form precipitates, removing organic matter from the wastewater.

[0052] It should also be noted that the breakpoint chemical oxidation method includes: controlling the amount of the second supernatant entering the chlorination tank 207 and maintaining the pH value between 7 and 8 to improve the removal rate of NH3-N (referring to the ammonia nitrogen content in water). Sodium hypochlorite and ammonia nitrogen are added, with the mass ratio of sodium hypochlorite to ammonia nitrogen controlled at 1:7. At this point, the NH3-N concentration in the water is generally below 10 mg / L. Sodium chlorate is then introduced to carry out the breakpoint chemical oxidation reaction.

[0053] In one exemplary embodiment, the high-concentration metal wastewater treatment system further includes:

[0054] The oxidation buffer tank 205 is connected to the chemical oxidation tank 204 and the sedimentation tank 206 by a pipeline. It is used to stir and mix the incoming third intermediate wastewater, and then input the stirred and mixed third intermediate wastewater into the sedimentation tank 206 to stir and mix the incoming third intermediate wastewater.

[0055] In this embodiment, by stirring and mixing the third intermediate wastewater in the oxidation buffer tank 205, the dissolved oxygen in the water is evenly distributed, the formation of dead water zones is reduced, and the oxidation reaction is promoted.

[0056] In one exemplary embodiment, an aeration device is provided in the oxidation buffer tank 205 to perform air aeration in order to stir and mix the introduced third intermediate wastewater.

[0057] For example, the aeration device includes multiple aeration pipes for air aeration to mix the introduced third intermediate wastewater.

[0058] In one exemplary embodiment, the sedimentation tank 206 includes:

[0059] The first sedimentation tank 206 is connected to the chemical oxidation tank 204 by a pipeline for water to be used to treat the third intermediate wastewater by sedimentation, generating the first precipitate and the first supernatant.

[0060] The second sedimentation tank 206 is connected to the first sedimentation tank 206 by a pipeline, and is used to treat the first supernatant by sedimentation to generate the second precipitate and the second supernatant. The second supernatant is the fourth intermediate wastewater.

[0061] It should be noted that, due to the high content of metal ions in high-concentration metal wastewater, a single sedimentation process cannot meet the requirements. Therefore, sedimentation treatment is required in the first sedimentation tank 206 and the second sedimentation tank 206 respectively.

[0062] For example, polyaluminum chloride (PAC) can be used as the chemical precipitant added during sedimentation in the first sedimentation tank 206 to improve the removal efficiency of heavy metals. In addition to sedimentation, PAC also has a certain coagulation and decolorization effect, which helps improve the visual appearance of colored wastewater and reduces the burden on subsequent treatment processes. Secondary sedimentation is carried out in the secondary sedimentation tank 206 by adding coagulants and flocculants.

[0063] In an exemplary embodiment, a dechlorination tank 208 is connected between the chlorination tank 207 and the clear water tank 210 via a pipeline. The dechlorination tank 208 is used to reduce the chlorine in the chlorination tank 207 that has not undergone complete reaction.

[0064] In this embodiment, in order to reduce secondary pollution caused by residual chlorine in the final purified water, a dechlorination tank 208 is set up to reduce the chlorine in the chlorination tank 207 that has not undergone complete reaction.

[0065] It is worth noting that when sodium hypochlorite is passed into wastewater containing ammonia nitrogen, the amount of chloride ions in the wastewater is minimal and the ammonia concentration is zero when the amount of sodium hypochlorite passed through reaches a certain value. Continuing to pass sodium hypochlorite will increase the amount of free chlorine in the solution. This point is called the inflection point, where the concentration of free chloride ions in the wastewater is also at its lowest. At this point, chlorine is reduced, and ammonia nitrogen is essentially oxidized. Further chlorination will produce residual free chlorine.

[0066] For example, the second supernatant wastewater enters the chlorination tank 207 and is further treated by breakpoint chemical oxidation to remove pollutants such as ammonia nitrogen. Then, in the dechlorination tank 208, the chlorine that has not been completely reacted is reduced to reduce secondary pollution caused by residual chlorine in the water.

[0067] For example, when reducing incompletely reacted chlorine, the reducing agent Na2S2O3 can be added to dechlorinate the chlorine, ensuring that the total residual chlorine level after dechlorination meets the emission standards.

[0068] In an exemplary embodiment, an ultrafiltration tank 209 is further provided between the dechlorination tank 208 and the clear water tank 210. The ultrafiltration tank 209 is used to filter the water output from the dechlorination tank 208, and the clear water tank 210 is used to store the clear water obtained after filtration by the ultrafiltration tank 209.

[0069] In an exemplary embodiment, the high-concentration metal wastewater treatment system further includes a filter press 211, which is used to dewater the first precipitate, the second precipitate, and the filtration residue of the ultrafiltration tank 209.

[0070] For example, the filter press 211 performs filter pressing on the sediment and sludge at the bottom of the ultrafiltration tank 209 to form a sludge cake and water removed by the filter press. The water removed by the filter press 211 is then returned to the wastewater tank 201 for further treatment.

[0071] In one exemplary embodiment, the high-concentration metal wastewater treatment system further includes a detection component for detecting various index parameters during the high-concentration metal wastewater treatment process.

[0072] For example, the detection component is used to detect indicators and parameters of wastewater treatment such as pH value and liquid level.

[0073] For example, the wastewater tank 201 is made of corrosion-resistant materials such as PP, PVC, or 316L stainless steel, and may be equipped with a liquid level sensor for controlling the inlet / outlet of water.

[0074] In one exemplary embodiment, the system further includes an automated control device (e.g., a PLC system integration), an anomaly alarm device (such as pH exceeding the standard or abnormal liquid level), and an emergency tank. The emergency tank is used to treat sudden high-concentration wastewater.

[0075] For example, the high-concentration metal wastewater treatment system also includes a pH adjustment device, which is used to add pH-adjusting agents. The pH value is detected by an online pH monitor, which is used to feed back the detected pH value to the control device. The automatic control device is used to control the dosage of the pH adjustment device based on the feedback pH value.

[0076] For example, the control device includes a controller, which can be a microcontroller, PLC, etc.

[0077] In one exemplary embodiment, the microelectrolysis cell 203 includes a cell body and an anode and a cathode disposed within the cell body.

[0078] For example, under acidic conditions, wastewater is used as the electrolyte solution, iron as the anode, and carbonaceous material as the cathode to form countless tiny galvanic cells that undergo electrochemical reactions in aqueous solution.

[0079] In one exemplary embodiment, an ultrafiltration tank 209 is provided with a filter element, which is an ultrafiltration ceramic flat sheet membrane.

[0080] In this embodiment, the wastewater is filtered through an ultrafiltration ceramic flat sheet membrane to reduce its color and suspended solids, thereby achieving discharge compliance.

[0081] For example, the wastewater tank 201, equalization tank 202, micro-electrolysis tank 203, chemical oxidation tank 204, oxidation buffer tank 205, sedimentation tank 206, chlorination tank 207, dechlorination tank 208, ultrafiltration tank 209 and clear water tank 210 are connected by pipelines, and wastewater is pumped out by installing pumps on the pipelines.

[0082] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A high-concentration metal wastewater treatment system, characterized in that, include: Wastewater ponds are used to store wastewater with high concentrations of metals. The equalization tank is connected to the wastewater tank by a pipeline and is used to adjust the pH value of the high-concentration metal wastewater to form an acidic first intermediate wastewater. A micro-electrolysis cell is connected to the equalization tank by a pipeline, which is used to perform micro-electrolysis on the first intermediate wastewater to form a second intermediate wastewater. A chemical oxidation tank, connected to the micro-electrolysis tank via a pipeline, is used to oxidize and decompose the second intermediate wastewater to form a third intermediate wastewater; A sedimentation tank is connected to the chemical oxidation tank by a pipeline for water flow, which is used to treat the third intermediate wastewater by sedimentation to form a fourth intermediate wastewater; A chlorination tank, connected to the sedimentation tank via a pipeline, is used to treat the fourth intermediate wastewater by inflection point chlorination. A clear water tank is used to store the treated clear water.

2. The high-concentration metal wastewater treatment system according to claim 1, characterized in that, The high-concentration metal wastewater treatment system also includes: An oxidation buffer tank, connected by a pipeline between the chemical oxidation tank and the sedimentation tank, is used to stir and mix the introduced third intermediate wastewater, and then input the stirred and mixed third intermediate wastewater into the sedimentation tank.

3. The high-concentration metal wastewater treatment system according to claim 2, characterized in that, The oxidation buffer tank is equipped with an aeration device for aeration to stir and mix the introduced third intermediate wastewater.

4. The high-concentration metal wastewater treatment system according to claim 1, characterized in that, The sedimentation tank includes: The first sedimentation tank is connected to the chemical oxidation tank by a pipeline for water flow, which is used to treat the third intermediate wastewater by sedimentation to generate the first precipitate and the first supernatant. The second sedimentation tank is connected to the first sedimentation tank by a pipeline and is used to precipitate the first supernatant to generate a second precipitate and a second supernatant. The second supernatant is the fourth intermediate wastewater.

5. The high-concentration metal wastewater treatment system according to claim 4, characterized in that, A dechlorination tank is connected to the chlorination tank and the clear water tank via a pipeline. The dechlorination tank is used to reduce the chlorine in the chlorination tank that has not undergone complete reaction.

6. The high-concentration metal wastewater treatment system according to claim 5, characterized in that, An ultrafiltration tank is also provided between the dechlorination tank and the clear water tank. The ultrafiltration tank is used to filter the water output from the dechlorination tank, and the clear water tank is used to store the clear water obtained after filtration by the ultrafiltration tank.

7. The high-concentration metal wastewater treatment system according to claim 6, characterized in that, The high-concentration metal wastewater treatment system also includes a filter press, which is used to dewater the first precipitate, the second precipitate, and the filtration residue from the ultrafiltration tank.

8. The high-concentration metal wastewater treatment system according to claim 1, characterized in that, The high-concentration metal wastewater treatment system also includes a detection component, which is used to detect various index parameters during the high-concentration metal wastewater treatment process.

9. The high-concentration metal wastewater treatment system according to any one of claims 1 to 8, characterized in that, The microelectrolysis cell includes a cell body and an anode and a cathode disposed within the cell body.

10. The high-concentration metal wastewater treatment system according to claim 6, characterized in that, The ultrafiltration tank is equipped with a filter element, which is an ultrafiltration ceramic flat sheet membrane.

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