Sulfate wastewater treatment device

Abstract

The utility model discloses a sulfate wastewater treatment device which comprises a high-concentration sulfate wastewater treatment device and a low-concentration sulfate wastewater treatment device, the high-concentration sulfate wastewater treatment device is sequentially provided with a high-concentration tank, a PH adjusting tank, an MVR, a clean water tank and a sludge treatment device; the low-concentration sulfate wastewater treatment device is sequentially provided with a low-concentration tank, a coagulation tank, a flocculation tank and a sedimentation tank, the upper part of the sedimentation tank is connected with a clean water tank, and the lower part of the sedimentation tank is connected with the sludge treatment device. And large type selection of single equipment and high investment and treatment cost during mixed treatment are avoided.

Description

Technical Field

[0001] This utility model relates to the field of mine wastewater treatment technology, specifically a sulfate wastewater treatment device. Background Technology

[0002] During the mining of coal, pyrite, and polymetallic sulfide ores, sulfur and sulfides in the ore are oxidized to form sulfates. SO4 in mine wastewater... 2- The concentration is generally greater than 1000 mg / L, but due to the low organic matter content in the wastewater, it is not suitable for biological treatment. Another type of industrial wastewater containing sulfate includes: monosodium glutamate (MSG) wastewater, petroleum refining acidic wastewater, edible oil production wastewater, pharmaceutical wastewater, printing and dyeing wastewater, sugar refining wastewater, molasses wastewater, and paper and pulping wastewater. Its SO4 content... 2- The main source is the auxiliary raw materials such as sulfuric acid, sulfurous acid, and their salts added during the production process. This type of wastewater contains a high concentration of SO4. 2- In addition, it generally contains a high amount of organic matter. It usually needs to be treated by biochemical methods, and anaerobic biochemical treatment processes are often used.

[0003] There are several treatment technologies for sulfate wastewater, including chemical precipitation and lime softening, which involve adding lime (Ca(OH)2) to react with SO42- in the wastewater. 2- The reaction produces a sparingly soluble CaSO4 precipitate, thus achieving the purpose of removing sulfate. Barium salt precipitation method: utilizing Ba... 2+ With SO4 2- The formation of water-insoluble BaSO4 precipitate is a method suitable for treating wastewater with high sulfate content. Electrodialysis: This method utilizes an electric field to drive charged particles through a semi-permeable membrane, achieving selective separation of sulfates. This method is suitable for situations with low sulfate concentrations. Ion exchange: This method uses ion exchange resins to adsorb SO4 from wastewater. 2- The sulfate is then washed off with a regenerated solution, achieving water purification. This method is suitable for wastewater treatment with moderate sulfate concentrations. Biological treatment: Sulfur-reducing bacteria treatment, under anaerobic conditions, utilizes specific microorganisms to remove SO42-. 2- Reduced to sulfides (S 2- Sulfides are then removed through precipitation or other methods. Wetland treatment systems: These systems construct artificial wetlands to simulate the purification process of natural wetlands, utilizing plant roots and the microbial communities that grow on them to degrade sulfates in the wastewater. Membrane separation technologies: Nanofiltration / reverse osmosis: These systems selectively remove SO4 using nanofiltration or reverse osmosis membranes. 2- This effectively reduces the sulfate concentration in wastewater. Advanced oxidation technology: Under specific conditions, it generates highly oxidizing free radicals to oxidize and decompose organic matter and sulfates in wastewater.

[0004] Currently, glass new material enterprises are generating increasing amounts of sulfate wastewater during production, leading to rising demands for treatment facilities and processes. Furthermore, increasingly stringent environmental protection requirements necessitate stricter discharge standards for certain salts, such as sulfate and chloride ions. Based on the production process, three main types of wastewater are generated, with relatively similar total amounts. First, the raw material waste liquid has a sulfate content as high as 80-100 g / L. Second, the primary filtrate has a sulfate content of approximately 20-30 g / L. Finally, the secondary filtrate has a sulfate content of approximately 1-3 g / L, and also contains small amounts of calcium, magnesium, and aluminum ions, carbonate, etc. The above-mentioned processes for treating this type of wastewater have the following characteristics: Chemical precipitation produces a large amount of sludge with high water content, requiring outsourcing for treatment. The sulfate content in the treated clear liquid still does not meet the discharge standards. If barium chloride precipitation is used, a large amount of chloride ions will be introduced, which will corrode the equipment and also fail to meet the discharge standards. Membrane separation is complex and costly for treating high-concentration sulfate wastewater (sulfate content higher than 10 g / L). The concentrated wastewater after treatment has a high water content, and further freezing and evaporation crystallization are required to reduce the volume. Freezing is only suitable for high-concentration sulfate wastewater (sulfate content higher than 40 g / L), and the concentration of the treated clear liquid is still above 1 g / L, requiring further treatment to meet the standards. Utility Model Content

[0005] The purpose of this invention is to provide a sulfate wastewater treatment device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sulfate wastewater treatment device includes a high-concentration sulfate wastewater treatment device and a low-concentration sulfate wastewater treatment device.

[0008] The high-concentration sulfate wastewater treatment device is sequentially equipped with a high-concentration tank, a pH adjustment tank, an MVR (Medium-Volume Resiner), a clear water tank, and a sludge treatment device.

[0009] The low-concentration sulfate wastewater treatment device is provided with a low-concentration tank, a coagulation tank, a flocculation tank, and a sedimentation tank in sequence. The upper part of the sedimentation tank is connected to the clear water tank, and the lower part is connected to the sludge treatment device.

[0010] As a further embodiment of this utility model: a sludge treatment device is connected to the rear end of the sedimentation tank, and the sludge treatment device is connected to the solid waste storage device.

[0011] As a further embodiment of this utility model: the pH adjustment tank is equipped with an acid-base dosing device.

[0012] As a further embodiment of this utility model, a barium chloride dosing device is provided in the coagulation tank.

[0013] As a further embodiment of this utility model, a PAM flocculant dosing device is provided in the flocculation tank.

[0014] As a further embodiment of this utility model: a condensation pipe is provided between the MVR and the clear water tank, and a condenser is provided on the condensation pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This application classifies and treats wastewater: the sulfate wastewater is divided into high-concentration and low-concentration wastewater for separate treatment, which avoids the large selection of single equipment and high investment and treatment costs when mixed treatment.

[0017] 2. This application directly uses an MVR (Mechanical Vapor Reduction) system for evaporation and salt separation of high-concentration water: MVR has lower investment and operating costs than low-temperature evaporation and multi-effect evaporation, for example, a 1.5m³ system can be designed... 3 When the processing capacity is / h, MVR costs nearly half that of the other two processes, and MVR can also be made into skid-mounted units, which occupy relatively little space. MVR is more suitable for treating high-concentration sulfate wastewater than low-temperature evaporation: when using low-temperature evaporation for this type of high-concentration sulfate wastewater, true salt separation cannot be achieved. Due to the inherent limitations of the low-temperature evaporation process, it can only concentrate the original wastewater to a concentrated waste liquid with a salt content of about 80%. MVR, on the other hand, can directly separate the original waste liquid into solid and liquid components, and the resulting waste salt has a water content of less than 5%, which greatly reduces the volume.

[0018] 3. The low-concentration treatment device designed in this application can directly treat sulfate wastewater with a concentration of less than 3 g / L. The low-concentration treatment device utilizes the reaction of barium ions and sulfate ions to generate barium sulfate precipitate, which can remove a portion of the sulfate ions.

[0019] 4. This application employs a method of mixing the condensate from the high-concentration treatment device with the supernatant from the low-concentration treatment device for discharge. On one hand, mixing the condensate, which contains virtually no sulfate or other pollutants, with the low-concentration supernatant lowers the overall sulfate concentration discharge standard, ensuring that the wastewater meets discharge standards. On the other hand, it reduces the dosage of chemicals such as barium ions used in the low-concentration treatment, as the sulfate in the low-concentration wastewater only needs to be treated to ensure that the concentration does not exceed the standard after mixing with the condensate, thereby reducing the cost of chemical usage. Attached Figure Description

[0020] Figure 1 This is a process flow diagram for this embodiment;

[0021] In the diagram: 1-High concentration tank, 2-pH adjustment tank, 3-MVR, 4-Clear water tank, 5-Solid waste storage device, 6-Sludge treatment device, 7-Low concentration tank, 8-Coagulation tank, 9-Flocculation tank, 10-Sedimentation tank. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 In this embodiment of the utility model, a high-concentration sulfate wastewater treatment device includes a high-concentration sulfate wastewater treatment device and a low-concentration sulfate wastewater treatment device.

[0024] The high-concentration sulfate wastewater treatment device is sequentially equipped with a high-concentration tank 1, a pH adjustment tank 2, an MVR 3, a clear water tank 4, and a solid waste storage device 5. The pH adjustment tank 2 is equipped with an acid and alkali dosing device to adjust the pH of the wastewater to meet the requirements for entering the MVR equipment. The MVR 3 is a mechanical vapor recompression device. A condensing pipe is installed between the MVR 3 and the clear water tank 4. A condenser is installed on the condensing pipe to condense the steam discharged from the MVR 3 and discharge it into the clear water tank 4.

[0025] The low-concentration sulfate wastewater treatment device is sequentially equipped with a low-concentration tank 7, a coagulation tank 8, a flocculation tank 9, and a sedimentation tank 10. The coagulation tank 8 is equipped with a barium chloride dosing device, where industrial barium chloride undergoes a chemical precipitation reaction to generate barium sulfate precipitate. The flocculation tank 9 is equipped with a flocculant PAM dosing device, which performs a flocculation reaction to form larger precipitate particles. The sedimentation tank 10 is connected to the clear water tank 4 and the sludge treatment device 6. The supernatant from the sedimentation tank 10 enters the clear water tank 4, and the settled sludge enters the sludge treatment device 6 for treatment.

[0026] In use, the wastewater from the high-concentration tank 1 is pumped into the pH adjustment tank 2, and the pH is adjusted by adding chemicals through the acid-base dosing device in the pH adjustment tank 2 to meet the requirements for entering the MVR 3. After the pH is adjusted, the wastewater is pumped into the MVR evaporator for evaporation, separating the water from the wastewater in the form of steam. The steam is then condensed by the condenser and discharged into the clear water tank. Sulfates and other substances in the wastewater are separated from the wastewater in solid form and enter the solid waste storage device.

[0027] Wastewater from the low-concentration tank 7 is pumped into the coagulation tank 8, where industrial barium chloride is added to produce barium sulfate precipitate through a chemical precipitation reaction. The water from the coagulation tank 8 then enters the flocculation tank 9, where flocculant PAM is added to produce larger precipitate particles through a flocculation reaction. The mud-water mixture in the flocculation tank 9 enters the sedimentation tank 10 for mud-water separation. The supernatant enters the clear water tank 4, and the settled sludge enters the sludge treatment device 6 for dewatering. The dewatered sludge then enters the solid waste storage device 5.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sulfate wastewater treatment device, characterized in that, This includes high-concentration sulfate wastewater treatment devices and low-concentration sulfate wastewater treatment devices; The high-concentration sulfate wastewater treatment device is sequentially equipped with a high-concentration tank (1), a pH adjustment tank (2), an MVR (3), a clear water tank (4), and a solid waste storage device (5); The low-concentration sulfate wastewater treatment device is provided with a low-concentration tank (7), a coagulation tank (8), a flocculation tank (9), and a sedimentation tank (10) in sequence. The upper part of the sedimentation tank (10) is connected to the clear water tank (4), and the lower part is connected to the solid waste storage device (5).

2. The sulfate wastewater treatment device according to claim 1, characterized in that, The sedimentation tank (10) is connected to a sludge treatment device (6) at its rear end, and the sludge treatment device (6) is connected to the solid waste storage device (5).

3. The sulfate wastewater treatment device according to claim 1, characterized in that, The pH adjustment tank (2) is equipped with an acid and alkali dosing device.

4. The sulfate wastewater treatment device according to claim 1, characterized in that, The coagulation tank (8) is equipped with a barium chloride dosing device.

5. The sulfate wastewater treatment device according to claim 1, characterized in that, The flocculation tank (9) is equipped with a flocculant PAM dosing device.

6. The sulfate wastewater treatment device according to claim 1, characterized in that, A condensing pipe is provided between the MVR (3) and the clear water tank (4), and a condenser is provided on the condensing pipe.

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