A system for treating pesticide wastewater with high salt and high organic content

Abstract

The utility model relates to a system for treating pesticide wastewater with high salt and high organic content, comprising a raw water tank, a sedimentation tank, a rectification device, an evaporation device, an A 2 O biochemical system, secondary sedimentation tank and discharge pool, distillation device is used to remove organic waste liquid from wastewater, evaporation device is used to remove salt from wastewater, A 2 The biochemical system is used to remove organic matter, total nitrogen pollutants, COD, and ammonia nitrogen pollutants from wastewater. This utility can greatly reduce the pollutant content of wastewater by extracting organic components from wastewater through a distillation device, and then remove salt from wastewater through an evaporation device. While recovering crystallized salt, the condensed wastewater can also directly enter the biochemical system for treatment. After being treated by the entire system, the system effluent meets the discharge standards and has a high application and promotion value.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a system for treating pesticide wastewater with high salt and high organic content. Background Art

[0002] The characteristics of pesticide wastewater are: complex water quality, high concentration of pollutants, high biological toxicity, and difficult to treat and degrade wastewater. The pesticide industry is one of the important chemical industries in my country and plays an important role in the national economy. However, the pesticide industry is also a major polluter. Every ton of pesticide products produced will discharge several tons or even more than ten tons of wastewater. The pesticide wastewater generated cannot be ignored. According to incomplete statistics, the total amount of pesticide wastewater discharged in my country each year is about 300 million m 3 . These pesticide wastewaters bring serious environmental pollution to the areas around the enterprises, especially along the river basins. Therefore, it is particularly necessary to treat the wastewater of the pesticide manufacturing industry economically and effectively. At the same time, due to the continuous updating of pesticide varieties in recent years, the chemical raw materials used in the pesticide production process are also constantly changing, which has also led to the emergence of more salt-containing and organic-containing pesticide wastewaters, making the treatment of pesticide wastewater increasingly difficult. Therefore, economical and efficient pesticide wastewater treatment technology is of great significance to ensure the sustainable development of my country's water resources. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a system for treating pesticide wastewater with high salt and high organic content.

[0004] The utility model is realized through the following technical solutions:

[0005] A system for treating pesticide wastewater with high salt and high organic content, comprising a raw water tank, a sedimentation tank, a rectification device, an evaporation device, an A 2 O biochemical system, secondary sedimentation tank and discharge pool, the distillation device is used to remove organic waste liquid in the wastewater, the evaporation device is used to remove salt in the wastewater, the A 2 O Biochemical system is used to remove organic matter, total nitrogen pollutants, COD, and ammonia nitrogen pollutants from wastewater.

[0006] According to the above technical solution, preferably, a coagulation and neutralization tank is connected between the raw water tank and the sedimentation tank, which is used to receive the wastewater in the raw water tank, add coagulants and coagulant aids, and discharge the wastewater into the sedimentation tank for mud and water separation.

[0007] According to the above technical solution, preferably, an intermediate water tank is connected between the precipitation tank and the distillation device.

[0008] According to the above technical solution, preferably, the evaporation device and A 2 OThere is a regulating water tank connected between the biochemical systems.

[0009] According to the above technical solution, preferably, the sedimentation tank and the secondary sedimentation tank are connected to a sludge storage tank, and the sludge storage tank is externally connected to a sludge dewatering machine.

[0010] According to the above technical solution, preferably, the water outlet of the raw water tank is connected to the water inlet of the coagulation and neutralization tank, the water outlet of the coagulation and neutralization tank is connected to the water inlet of the sedimentation tank, the water outlet of the sedimentation tank is connected to the water inlet of the intermediate water tank, the water outlet of the intermediate water tank is connected to the water inlet of the rectification device, the water outlet of the evaporation device is connected to the water inlet of the regulating water tank, and the water outlet of the regulating water tank is connected to the A 2 O biochemical system water inlet is connected, the A 2 The outlet of the O biochemical system is connected to the inlet of the secondary sedimentation tank.

[0011] The beneficial effects of the utility model are:

[0012] The utility model aims to solve the problems in the prior art that the conventional Fenton oxidation method + chemical precipitation method has incomplete treatment effect and the biochemical system cannot treat high-salt wastewater. The organic components in the wastewater are extracted by a distillation device, which can greatly reduce the pollutant content of the wastewater. The salt in the wastewater is then removed by an evaporation device. While the crystallized salt is recovered, the condensed wastewater can also directly enter the biochemical system for treatment. After being treated by the whole system, the system effluent meets the discharge standard and has a high application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a system connection schematic diagram of the utility model.

[0014] In the figure: 1. Raw water tank; 2. Coagulation and neutralization tank; 3. Sedimentation tank; 4. Intermediate water tank; 5. Distillation device; 6. Evaporation device; 7. Adjustment pool; 8. A 2 O biochemical system; 9. Secondary sedimentation tank; 10. Discharge pool; 11. Sludge storage tank; 12. Sludge dewatering machine. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model.

[0016] In the description of the utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the utility model.

[0017] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Embodiment 1: As shown in the figure, the utility model comprises a raw water tank 1, a sedimentation tank 3, a rectification device 5, an evaporation device 6, and an A 2 O biochemical system 8, secondary sedimentation tank 9 and discharge water tank 10, the raw water tank 1 and the sedimentation tank 3 are connected with a coagulation and neutralization tank 2, which is used to receive the wastewater in the raw water tank 1, add coagulants and coagulants, and discharge it to the sedimentation tank 3 for mud and water separation. The distillation device 5 is used to remove organic waste liquid from the wastewater, the evaporation device 6 is used to remove salt from the wastewater, and the A 2 O biochemical system 8 is used to remove organic matter, total nitrogen pollutants, COD, and ammonia nitrogen pollutants in wastewater. Among them, the distillation device 5, the evaporation device 6, A 2 O biochemical system 8 is all existing technology, and its specific device structure is not repeated in the embodiments of this application.

[0019] Among them, the wastewater first enters the raw water tank 1, and the wastewater in the raw water tank 1 is discharged into the coagulation neutralization tank 2 by the lifting water pump. PAC, sodium hydroxide, and PAM reagents are added to the coagulation neutralization tank 2 to complete the coagulation effect and adjust the pH to weak alkalinity. Then the wastewater enters the sedimentation tank 3 for mud and water separation, and the sedimentation supernatant flows to the distillation device 5.

[0020] The distillation device 5 is used to extract organic components, wherein the distillate is an organic waste liquid with an organic content of about 30%. The waste water after distillation contains only a small amount of organic matter but the salt content remains unchanged, and then enters the evaporation device 6 for desalination treatment.

[0021] Wastewater enters A 2 O biochemical system 8 for biochemical treatment, A 2O Biochemical system 8 is a biochemical combination process of "hydrolysis--anoxic--aerobic", in which the main function of hydrolysis is to use anaerobic bacteria to hydrolyze organic matter in wastewater to improve the biodegradability of wastewater, the main function of anoxic bacteria is to use facultative anaerobic bacteria to carry out denitrification to remove total nitrogen pollutants in wastewater, and the main function of aerobic is to use aerobic bacteria to remove COD and ammonia nitrogen pollutants in wastewater. The wastewater after biochemical treatment enters the secondary sedimentation tank 9 for mud and water separation, and the supernatant enters the discharge pool 10 and meets the discharge standards.

[0022] Embodiment 2: As shown in the figure, the utility model comprises a raw water tank 1, a coagulation and neutralization tank 2, a sedimentation tank 3, an intermediate water tank 4, a rectification device 5, an evaporation device 6, a regulating water tank 7, and an A 2 O biochemical system 8, secondary sedimentation tank 9 and discharge pool 10, the distillation device 5 is used to remove organic waste liquid in the wastewater, the evaporation device 6 is used to remove salt in the wastewater, the A 2 The O biochemical system 8 is used to remove organic matter, total nitrogen pollutants, COD, and ammonia nitrogen pollutants in the wastewater. The sedimentation tank 3 and the secondary sedimentation tank 9 are connected to a sludge storage tank 11, and the sludge storage tank 11 is externally connected to a sludge dewatering machine 12. Specifically, the water outlet of the raw water tank 1 is connected to the water inlet of the coagulation and neutralization tank 2, the water outlet of the coagulation and neutralization tank 2 is connected to the water inlet of the sedimentation tank 3, the water outlet of the sedimentation tank 3 is connected to the water inlet of the intermediate water tank 4, the water outlet of the intermediate water tank 4 is connected to the water inlet of the rectification device 5, the water outlet of the evaporation device 6 is connected to the water inlet of the regulating water tank 7, and the water outlet of the regulating water tank 7 is connected to the A 2 O is connected to the water inlet of the biochemical system 8, and the A 2 The water outlet of the O biochemical system 8 is connected to the water inlet of the secondary sedimentation tank 9.

[0023] The wastewater in the raw water tank 1 is discharged into the coagulation and neutralization tank 2 by the lifting water pump. The outlet of the coagulation and neutralization tank 2 is connected with the sedimentation tank 3. PAC, sodium hydroxide and PAM reagents are added to the coagulation and neutralization tank 2 to make the wastewater complete the coagulation effect in the coagulation and neutralization tank 2 and adjust the pH to weak alkalinity. The wastewater in the intermediate water tank 4 is discharged into the distillation device 5 by the lifting water pump to extract the organic components in the wastewater. The outlet of the distillation device 5 is connected with the evaporation device 6. The wastewater is discharged into the evaporation device 6 by the lifting water pump to extract the salt in the wastewater. The outlet of the evaporation device 6 is connected with the regulating water tank 7. In this example, the regulating water tank 7 is a water storage tank, which plays a storage role and can stir the wastewater evenly to make the water quality uniform. The organic components extracted by the distillation device 5 are incinerated, the solid crystal salt extracted by the evaporation device 6 is recycled, and the mother liquor regularly discharged by the evaporation device 6 is incinerated.

[0024] The wastewater in the regulating pool 7 is discharged into A by the lifting pump 2O biochemical system 8, so that the wastewater can be further treated in the biochemical system, A 2 The outlet of the biochemical system 8 is connected with the secondary sedimentation tank 9, and the wastewater flows into the secondary sedimentation tank 9 by gravity for mud-water separation. The outlet of the secondary sedimentation tank 9 is connected with the discharge pool 10, and the wastewater flows into the discharge pool 10 by gravity, and then is discharged in compliance with the standards.

[0025] In addition, the sludge storage tank 11 is connected to the sedimentation tank 3 and the secondary sedimentation tank 9, wherein the sedimentation tank 3 and the secondary sedimentation tank 9 need to regularly discharge sludge into the sludge storage tank 11. The sludge storage tank 11 is connected to the sludge dewatering machine 12, and the sludge in the sludge storage tank 11 is discharged into the sludge dewatering machine 12 for sludge dewatering. The generated mud cake is outsourced for treatment, and the sludge filtrate is returned to the raw water tank 1.

[0026] In this embodiment, the wastewater first enters the raw water tank 1, and then is pumped into the coagulation and neutralization tank 2. The wastewater after the reaction enters the sedimentation tank 3, the wastewater flows into the intermediate water tank 4 by gravity, and then is pumped into the distillation device 5 for organic component extraction. After the wastewater is distilled, it enters the evaporation device 6 for salt extraction. After the wastewater evaporates, it enters the regulating water tank 7 and is then pumped into the A 2 The biochemical system 8 performs biochemical treatment, then flows by gravity into the secondary sedimentation tank 9 for mud and water separation, and finally the wastewater flows by gravity into the discharge pool 10, and then is discharged in compliance with the standards. The sludge generated by the system is discharged into the sludge storage tank 11 by a water pump, and then enters the sludge dewatering machine 12 for sludge dewatering, and the resulting mud cake is outsourced for treatment.

[0027] The utility model aims to solve the problems in the prior art that the conventional Fenton oxidation method + chemical precipitation method has incomplete treatment effect and the biochemical system cannot treat high-salt wastewater. The organic components in the wastewater are extracted by a distillation device, which can greatly reduce the pollutant content of the wastewater. The salt in the wastewater is then removed by an evaporation device. While the crystallized salt is recovered, the condensed wastewater can also directly enter the biochemical system for treatment. After being treated by the whole system, the system effluent meets the discharge standard and has a high application and promotion value.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A system for treating pesticide wastewater with high salt and high organic content, characterized in that: It comprises a raw water tank (1), a sedimentation tank (3), a distillation device (5), an evaporation device (6), and an A 2 O biochemical system (8), secondary sedimentation tank (9) and discharge pool (10), The distillation device (5) is used to remove organic waste liquid from the waste water, the evaporation device (6) is used to remove salt from the waste water, and the A 2 The O biochemical system (8) is used to remove organic matter, total nitrogen pollutants, COD, and ammonia nitrogen pollutants from wastewater.

2. A high-salt and high-organic content pesticide wastewater treatment system according to claim 1, characterized in that: A coagulation and neutralization tank (2) is connected between the raw water tank (1) and the sedimentation tank (3) and is used to receive wastewater in the raw water tank (1), add coagulants and coagulant aids, and discharge the wastewater into the sedimentation tank (3) for mud and water separation.

3. A high-salt and high-organic content pesticide wastewater treatment system according to claim 2, characterized in that: An intermediate water tank (4) is connected between the precipitation tank (3) and the distillation device (5).

4. A high-salt and high-organic content pesticide wastewater treatment system according to claim 3, characterized in that: The evaporation device (6) and A 2 The O biochemical system (8) is connected to a regulating water tank (7).

5. A high-salt and high-organic content pesticide wastewater treatment system according to claim 2, characterized in that: The sedimentation tank (3) and the secondary sedimentation tank (9) are connected to a sludge storage tank (11), and the sludge storage tank (11) is externally connected to a sludge dewatering machine (12).

6. A high-salt and high-organic content pesticide wastewater treatment system according to claim 4, characterized in that: The water outlet of the raw water tank (1) is connected to the water inlet of the coagulation and neutralization tank (2), the water outlet of the coagulation and neutralization tank (2) is connected to the water inlet of the sedimentation tank (3), the water outlet of the sedimentation tank (3) is connected to the water inlet of the intermediate water tank (4), the water outlet of the intermediate water tank (4) is connected to the water inlet of the rectification device (5), the water outlet of the evaporation device (6) is connected to the water inlet of the regulating water tank (7), and the water outlet of the regulating water tank (7) is connected to the A 2 O is connected to the water inlet of the biochemical system (8), and the A 2 The water outlet of the O biochemical system (8) is connected to the water inlet of the secondary sedimentation tank (9).

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