Pesticide wastewater pretreatment device

Abstract

The utility model discloses a pesticide wastewater pretreatment device which comprises a raw water storage tank, a heat exchanger, an evaporator and an advanced oxidation reactor, raw water is stored in the raw water storage tank through an input port of the raw water storage tank, the raw water storage tank is connected with the heat exchanger and connected with the evaporator through the heat exchanger, and a steam port is formed in the upper end of the evaporator. The steam port is connected with the heat exchanger again and connected with the advanced oxidation reactor through the heat exchanger, and the heat exchanger is externally connected with cold water through a cooling water pipe. According to the device, the pesticide wastewater is pre-treated in a targeted manner, the temperature of the pesticide wastewater in the raw water storage tank is raised, and the pesticide wastewater is evaporated in the evaporator to obtain salty mud, so that salt in the wastewater is filtered, the salt content of the pesticide wastewater is reduced, the toxicity of harmful substances is reduced, and the operation stability of subsequent biological treatment is improved; finally, the pesticide wastewater treatment is promoted to reach the standard. Meanwhile, the heat exchanger is used for increasing the energy utilization efficiency and the working efficiency of the device.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a pesticide wastewater pretreatment device. Background Art

[0002] Due to limited arable land and frequent extreme climates in various places, the global food crisis has not been completely eliminated. Although my country's grain output has increased year by year, the increasing import volume of agricultural products in my country shows that my country's dependence on foreign agricultural products is getting higher and higher. Pesticides, as an important guarantee for agricultural product production, have become an important material related to the national economy and people's livelihood. However, pesticides will produce a large amount of wastewater during the production process. Its pollutants have high organic matter concentration, high ammonia nitrogen and total nitrogen concentration, high salt content, and strong biological toxicity. Single physical separation, chemical oxidation and other pretreatments cannot guarantee the stable operation of subsequent biological treatment processes, nor can they guarantee the effectiveness of wastewater treatment.

[0003] Therefore, there is an urgent need for a pesticide wastewater pretreatment device to solve the problem of poor pretreatment effect of pesticide wastewater. Utility Model Content

[0004] The utility model aims at the deficiencies in the prior art and provides a pesticide wastewater pretreatment device to solve the problem of poor pretreatment effect of pesticide wastewater.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pesticide wastewater pretreatment device, characterized in that it includes a raw water storage tank, a heat exchanger, an evaporator and an advanced oxidation reactor, the raw water storage tank is used to store raw water, the raw water storage tank is connected to the heat exchanger, and is connected to the evaporator through the heat exchanger, the evaporator is provided with a steam port, the steam port is reconnected to the heat exchanger, and is connected to the advanced oxidation reactor through the heat exchanger, the evaporator is also provided with a salt discharge port, and the heat exchanger is externally connected to cold water through a cooling water pipe.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] Furthermore, the salt discharge port of the evaporator is connected to a solid-liquid separator, which is connected to the input port of the raw water storage tank. The solid-liquid separator is used to collect the salt mud discharged from the evaporator for solid-liquid separation, and re-discharge the separated filtrate into the raw water storage tank.

[0009] Furthermore, a salt discharge valve is provided between the evaporator and the solid-liquid separator.

[0010] Furthermore, the lower end of the evaporator is configured to be a downward conical contraction, and the conical contraction is the salt discharge port, and the steam port is arranged at the upper end of the evaporator.

[0011] Furthermore, a coil heater is arranged on the side wall of the evaporator, and an agitator is arranged in the evaporator.

[0012] Furthermore, the output end of the advanced oxidation reactor is provided with a water outlet and a circulation port, and the circulation port is connected to a circulation pipeline; the evaporator is connected to the heat exchanger through the steam port, and then connected to the circulation pipeline through the heat exchanger; the circulation pipeline is then connected to the heat exchanger, and is connected to the input end of the advanced oxidation reactor through the heat exchanger.

[0013] Furthermore, the circulation pipeline is provided with a cooling circulation pump for mixing the water flowing out of the circulation port of the advanced oxidation reactor with the water condensed from the steam heat exchanger and inputting the mixture into the heat exchanger.

[0014] Furthermore, it also includes a reagent storage tank, which is connected to the pipeline connecting the heat exchanger and the input end of the advanced oxidation reactor. The reagent storage tank is provided with a reagent dosing pump for passing the reagent into the advanced oxidation reactor.

[0015] Furthermore, the advanced oxidation reactor is partitioned by a plurality of partitions into a flow channel formed by a plurality of S-shaped channels, and an ultraviolet light source is arranged between every two partitions.

[0016] Furthermore, a first thermometer is provided in the evaporator, and a second thermometer is provided in the advanced oxidation reactor.

[0017] The beneficial effects of the utility model are:

[0018] The utility model device pre-treats the pesticide wastewater in a targeted manner, by heating the pesticide wastewater in the raw water storage tank and evaporating it in the evaporator to obtain salt mud, thereby filtering the salt in the wastewater to reduce the salt content of the pesticide wastewater, reduce the toxicity of harmful substances, improve the stability of subsequent treatment operations, and ultimately promote the pesticide wastewater treatment to meet the standards. At the same time, the steam discharged from the steam port of the evaporator is used to preliminarily heat the raw water output from the raw water storage tank in the heat exchanger to increase the energy utilization efficiency and the working efficiency of the device, and cold water is provided by the cooling water pipe to further condense the steam, so that the condensate after condensation flows into the advanced oxidation reactor for further oxidation.

[0019] The device of the utility model can be set to work under normal pressure, with a fully enclosed container to reduce secondary pollution; and the device can be set in an integrated skid-mounted form, which is convenient to install and transport and can achieve fully automatic operation and simple operation; the device of the utility model fully considers the use of surplus heat of the device to save energy, and can separate and oxidize characteristic pollutants more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of the overall structure of a pesticide wastewater pretreatment device proposed by the utility model;

[0021] Figure 2 This is a schematic diagram of the installation of a first thermometer and a second thermometer of a pesticide wastewater pretreatment device proposed by the utility model.

[0022] Figure numerals: raw water storage tank 1, heat exchanger 2, evaporator 3, advanced oxidation reactor 4, reagent storage tank 5, raw water lift pump 6, agitator 7, coil heater 8, first thermometer 9, salt discharge valve 10, cooling water pipe 11, reagent dosing pump 12, second thermometer 13, ultraviolet light source 14, cooling circulation pump 15, solid-liquid separator 16. DETAILED DESCRIPTION

[0023] The utility model is described in detail below with reference to the accompanying drawings.

[0024] As attached Figure 1 As shown, a pesticide wastewater pretreatment device according to an embodiment of the utility model comprises a raw water storage tank 1, a heat exchanger 2, an evaporator 3 and an advanced oxidation reactor 4. The pesticide wastewater is stored in the raw water storage tank 1 as raw water through the input port of the raw water storage tank 1. The raw water storage tank 1 is connected to the heat exchanger 2, and is connected to the evaporator 3 through the heat exchanger 2. The heat exchanger 2 is used to heat the raw water discharged from the raw water storage tank 1; the upper end of the evaporator 3 is a steam port, which is reconnected to the heat exchanger 2 through the steam port, and is connected to the advanced oxidation reactor 4 through the heat exchanger 2. The lower end of the evaporator 3 is provided with a salt discharge port, and the heat exchanger 2 is externally connected to cold water through a cooling water pipe 11, and the cold water is discharged from the discharge port of the heat exchanger 2 after being heated by the heat exchanger 2, so as to be used for cooling the heat exchanger 2.

[0025] In this embodiment, the material of the raw water storage tank 1 can be selected as PE, a raw water lift pump 6 can be arranged between the raw water storage tank 1 and the heat exchanger 2, and the material of the flow-through part of the raw water lift pump 6 can be fluoroplastic; a valve can be arranged on the cooling water pipe 11, and the valve can be an electric ball valve; the advanced oxidation reactor 4 adopts a rectangular baffle reactor, and the material is SUS316. In this embodiment, the connection between the components can be piped.

[0026] The utility model pre-treats the pesticide wastewater in a targeted manner, heats the pesticide wastewater in the raw water storage tank 1 through the heat exchanger 2, and obtains salt mud after evaporation in the evaporator 3, and discharges the salt mud through the salt discharge port, thereby filtering the salt in the wastewater to reduce the salt content of the pesticide wastewater, reduce the toxicity of harmful substances, improve the stability of subsequent biological treatment operations, and ultimately promote the pesticide wastewater treatment to meet the standards. At the same time, the raw water output from the raw water storage tank 1 is preliminarily heated in the heat exchanger 2 using the steam discharged from the steam port of the evaporator 3 to increase the energy utilization efficiency and the working efficiency of the device, and the cooling water pipe 11 provides cold water to further condense the steam so that the condensate after condensation flows into the advanced oxidation reactor 4.

[0027] In another embodiment, the salt discharge port at the lower end of the evaporator 3 is connected to a solid-liquid separator 16, which is connected to the input port of the raw water storage tank 1. The solid-liquid separator 16 is used to collect the salt mud discharged from the evaporator 3 for solid-liquid separation, and to discharge the separated filtrate back into the raw water storage tank 1. In this way, the salt mud can be further divided into mud residue for hazardous waste disposal, and the filtrate can be returned to the raw water storage tank 1 for recycling treatment, thereby ensuring the treatment effect. In this embodiment, the solid-liquid separator 16 adopts a vertical drum centrifugal separator made of SUS316.

[0028] A salt discharge valve 10 is provided on the pipeline connecting the evaporator 3 and the solid-liquid separator 16. Thus, the salt mud in the evaporator 3 can be discharged outwardly through the salt discharge valve 10 as needed and on a regular basis.

[0029] The lower end of the evaporator 3 is connected to a solid-liquid separator 16, and the lower end of the evaporator 3 is set to a downward conical necking shape. Specifically, the upper part of the evaporator 3 is cylindrical, and the lower part is conical, and the material is titanium. In this way, the conical lower part structure is more convenient for the discharge of salt mud.

[0030] In another embodiment, a coil heater 8 is provided on the side wall of the evaporator 3 to ensure the evaporation effect of the evaporator 3. A stirrer 7 is installed on the upper end of the evaporator 3. The stirrer 7 is used to stir the waste liquid in the evaporator 3 to further increase the evaporation efficiency of the waste liquid. In this embodiment, the stirrer 7 is a vertical paddle stirrer, and the stirrer shaft and the paddle are made of titanium.

[0031] The evaporator 3 is reconnected to the heat exchanger 2 through the steam port, and is connected to the advanced oxidation reactor 4 through the heat exchanger 2. There are many implementation methods.

[0032] In a specific embodiment, the steam obtained by the evaporator 3 can be directly oxidized after condensation. That is, the steam port of the evaporator 3 is connected to the heat exchanger 2, and directly connected to the advanced oxidation reactor 4 through the heat exchanger 2. At this time, the steam is cooled down by the heat exchanger 2 to become condensed water, and the condensed water directly flows into the advanced oxidation reactor 4 for oxidation reaction.

[0033] In another specific embodiment, the steam obtained by the evaporator 3 can be mixed with part of the oxidized water after condensation before oxidation. That is, the output end of the advanced oxidation reactor 4 is provided with a water outlet and a circulation port, the water outlet is used for the normal discharge of the treated water, and the circulation port is connected to a circulation pipeline; at the same time, the evaporator 3 is connected to the heat exchanger 2 through the steam port, and then connected to the circulation pipeline through the heat exchanger 2; the circulation pipeline is then connected to the input end of the advanced oxidation reactor 4 through the heat exchanger 2. In this embodiment, the condensed water after condensation of the evaporator 3 entering the heat exchanger 2 from the steam port is pre-mixed with a part of the water with oxidant from the advanced oxidation reactor 4, and then enters the heat exchanger 2 for further cooling, and then flows into the advanced oxidation reactor 4 uniformly, so that the treatment effect of the wastewater is further guaranteed by the pre-mixing of the condensed water and the water with oxidant, and the cooling effect is improved by circulating cooling. In this embodiment, the heat exchanger 2 adopts a four-medium channel coil-type cold and heat exchanger made of titanium. The circulation pipeline is provided with a cooling circulation pump 15 for mixing the water flowing out of the circulation port of the advanced oxidation reactor 4 with the water after condensation of the steam from the heat exchanger 2 and inputting it into the heat exchanger 2. The flow-through part of the cooling circulation pump 15 is made of fluoroplastic. In this way, the mixed water of the condensed water and a part of the oxidation water can be effectively guided by the cooling circulation pump 15, thereby ensuring the working efficiency of the device.

[0034] The reagent storage tank 5 is also included. The pipeline connecting the heat exchanger 2 and the input end of the advanced oxidation reactor 4 is connected with the reagent storage tank 5. The reagent storage tank 5 is provided with a reagent dosing pump 12 for passing the reagent into the advanced oxidation reactor 4. In this way, the reagent in the reagent storage tank 5 can be added to the mixed water body through the reagent dosing pump 12 to further purify the wastewater. In this embodiment, the reagent storage tank 5 is made of PE, the reagent dosing pump 12 is a diaphragm metering pump, the material of the flow-through part is PVC, and the oxidant in the reagent storage tank 5 is hydrogen peroxide with a concentration of 30%.

[0035] In another embodiment, the advanced oxidation reactor 4 is divided into a flow channel formed by connecting a plurality of S-shaped channels by a plurality of partitions, and an ultraviolet light source 14 is arranged between every two partitions, thereby ensuring the treatment effect of the wastewater. In this embodiment, a quartz sleeve and an ultraviolet light source 14 are installed inside the advanced oxidation reactor 4, the quartz sleeve is used to be sleeved on the ultraviolet light source 14, the ultraviolet light source 14 is used to provide medium-pressure ultraviolet light, and the quartz sleeve is removable for cleaning.

[0036] When the utility model device is in use, the pesticide wastewater enters the raw water storage tank 1 for collection, is lifted into the heat exchanger 2 by the raw water lifting pump 6, and enters the evaporator 3 after preliminary heating; the evaporator 3 heats the wastewater again through the coil heater 8, and starts the stirrer 7 for stirring during the heating process, and the wastewater evaporates to generate secondary steam and enters the heat exchanger 2 for cooling; at this time, salt mud is formed in the evaporator 3 through concentration and precipitation, and the salt mud is regularly discharged into the solid-liquid separator 16 by the staff. After the solid-liquid separator 16 separates the salt mud, the separated filtrate is returned to the raw water storage tank 1 for circulation treatment, and the obtained salt residue is disposed of as hazardous waste; the secondary steam after the wastewater evaporates enters the heat exchanger 2 for cooling to form condensed water, and is mixed with a part of the water body with oxidant output from the advanced oxidation reactor 4, and is input into the heat exchanger 2 by the circulation pump 15 for further circulation and cooling, and then enters the advanced oxidation reactor 4, the wastewater undergoes a strong oxidation reaction under the catalytic action of ultraviolet light in the advanced oxidation reactor 4, and is discharged from the device after catalytic oxidation, completing the pretreatment.

[0037] As attached Figure 2 As shown, in another embodiment, a first thermometer 9 is provided in the evaporator 3, and a second thermometer 13 is provided in the advanced oxidation reactor 4. When in use, the temperature in the evaporator 3 can be controlled at 105°C by the first thermometer 9, and the reaction temperature of the advanced oxidation reactor 4 can be controlled at 45-50°C by the second thermometer 13.

[0038] When the utility model device is in use, the pesticide wastewater enters the raw water storage tank 1 for collection, is lifted by the raw water lifting pump 6 and enters the heat exchanger 2, and is preheated by using the secondary steam of the evaporator 3 and the heat of the advanced oxidation reactor 4; the raw water enters the evaporator 3 after being heated, and the raw water is heated to 105°C by the coil heater 8 in the evaporator 3, and the stirrer 7 is started for stirring, and the coil heater 8 is started and stopped according to the timely temperature and the set temperature of the first thermometer 9, and the raw water evaporates in the evaporator 3 after reaching the boiling point to form crystallized salt mud and secondary steam, and the salt mud is concentrated and discharged into the solid-liquid separation device regularly through the salt discharge valve 10. The steam is separated from the machine 16 for solid-liquid separation; the secondary steam enters the heat exchanger 2 to be cooled into condensed water, mixed with the advanced oxidation circulating water and enters the circulating pump 15, and then the mixed water enters the heat exchanger 2 for cooling, and enters the advanced oxidation reactor 4 after cooling; the oxidant in the reagent storage tank 5 is lifted by the reagent dosing pump 12 to be further mixed with the mixed water output from the heat exchanger 2, and enters the advanced oxidation reactor 4; under the catalytic action of the ultraviolet light source 14, the harmful substances in the wastewater are oxidized and decomposed; the valve of the cooling water pipe 11 is opened and closed according to the timely temperature and the set temperature of the second thermometer 13 in the advanced oxidation reactor 4.

[0039] When in use, the coil heater 8 of the evaporator 3 starts heating according to the set temperature and the timely temperature comparison of the evaporator 3; the valve of the cooling water pipe 11 starts cooling according to the set temperature of the advanced oxidation reactor 4 and the timely temperature comparison in the advanced oxidation reactor 4.

[0040] The utility model device can be set to work under normal pressure, with a fully enclosed container to reduce secondary pollution; and the device can be set in an integrated skid-mounted form, which is convenient to install and transport and can realize fully automatic operation and simple operation; the utility model device fully considers the use of surplus heat of the device, and uses raw water, secondary steam, cooling water, and advanced oxidation circulating water to exchange heat with each other, saving energy consumption, and can separate and oxidize characteristic pollutants more thoroughly, wherein the raw water temperature is initially increased, the secondary steam temperature is reduced to obtain condensed water, the circulating water temperature of the advanced oxidation reactor is reduced, and if the temperature is too high, the cooling water inlet valve is opened to cool it down.

[0041] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. used in the utility model are only for the convenience of description and are not used to limit the scope of implementation of the utility model. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the utility model without substantially changing the technical content.

[0042] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims

1. A pesticide wastewater pretreatment device, characterized in that: The invention comprises a raw water storage tank (1), a heat exchanger (2), an evaporator (3) and an advanced oxidation reactor (4). The raw water storage tank (1) is used to store raw water. The raw water storage tank (1) is connected to the heat exchanger (2) and connected to the evaporator (3) through the heat exchanger (2). The evaporator (3) is provided with a steam port, which is reconnected to the heat exchanger (2) through the steam port and connected to the advanced oxidation reactor (4) through the heat exchanger (2). The evaporator (3) is also provided with a salt discharge port. The heat exchanger (2) is externally connected to cold water through a cooling water pipe (11).

2. A pesticide wastewater pretreatment device according to claim 1, characterized in that: The salt discharge port of the evaporator (3) is connected to a solid-liquid separator (16), and the solid-liquid separator (16) is connected to the input port of the raw water storage tank (1). The solid-liquid separator (16) is used to collect the salt mud discharged from the evaporator (3) for solid-liquid separation, and to discharge the filtrate obtained by separation back into the raw water storage tank (1).

3. A pesticide wastewater pretreatment device according to claim 2, characterized in that: A salt discharge valve (10) is provided between the evaporator (3) and the solid-liquid separator (16).

4. A pesticide wastewater pretreatment device according to claim 1, characterized in that: The lower end of the evaporator (3) is configured to be in a downward conical contraction shape, and the conical contraction is the salt discharge port, and the steam port is arranged at the upper end of the evaporator (3).

5. A pesticide wastewater pretreatment device according to claim 1, characterized in that: A coil heater (8) is provided on the side wall of the evaporator (3), and a stirrer (7) is provided in the evaporator (3).

6. A pesticide wastewater pretreatment device according to claim 1, characterized in that: The output end of the advanced oxidation reactor (4) is provided with a water outlet and a circulation port, and the circulation port is connected to a circulation pipeline; the evaporator (3) is connected to the heat exchanger (2) via the steam port, and then connected to the circulation pipeline via the heat exchanger (2); the circulation pipeline is then connected to the heat exchanger (2), and the heat exchanger (2) is connected to the input end of the advanced oxidation reactor (4).

7. A pesticide wastewater pretreatment device according to claim 6, characterized in that: The circulation pipeline is provided with a cooling circulation pump (15) for mixing water flowing out of the circulation port of the advanced oxidation reactor (4) with water condensed from the steam heat exchanger (2) and inputting the mixture into the heat exchanger (2).

8. A pesticide wastewater pretreatment device according to claim 6, characterized in that: It also includes a reagent storage tank (5), which is connected to the pipeline connecting the heat exchanger (2) and the input end of the advanced oxidation reactor (4), and the reagent storage tank (5) is provided with a reagent dosing pump (12) for passing the reagent into the advanced oxidation reactor (4).

9. A pesticide wastewater pretreatment device according to claim 1, characterized in that: The advanced oxidation reactor (4) is divided into a flow channel formed by a plurality of partitions and connected by a plurality of S-shaped channels, and an ultraviolet light source (14) is arranged between every two partitions.

10. The pesticide wastewater pretreatment device according to claim 1, characterized in that: The evaporator (3) is provided with a first thermometer (9), and the advanced oxidation reactor (4) is provided with a second thermometer (13).

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