Integrated perchlorate wastewater treatment device

Abstract

The utility model discloses an integrated treatment device for perchlorate wastewater. The integrated treatment device comprises a box body, a pretreatment unit, an advanced treatment unit, a matched medicament adding unit and a control unit, the pretreatment unit comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a fourth-stage reaction tank and a sedimentation tank, the pretreatment unit is provided with a water inlet, the deep treatment unit comprises a multi-medium filter, a carbon filter tank and a resin tank, and the medicament adding unit comprises a medicament dissolving and storing device and medicament adding equipment. According to the utility model, a proper amount of chemicals can be added into the pretreatment unit according to the content of perchlorate, so that the chemicals are prevented from being wasted, the perchlorate in the wastewater is effectively removed (the one-step removal rate is up to more than 95%), the impact load resistance is strong, the purification is efficient, the operation is stable, and no secondary pollution exists. Meanwhile, whether water passes through the deep treatment unit or not can be selected according to actual water outlet requirements, so that the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an integrated perchlorate wastewater treatment device. Background Art

[0002] Perchlorate, a pollutant newly included in the "National Drinking Water Quality Standard" (GB 5749-2022), is widely used and in high demand. It is highly soluble and difficult to decompose. It can damage the human thyroid function and affect growth and development. Its treatment can ensure the drinking water safety and health of residents.

[0003] Existing perchlorate wastewater treatment systems primarily utilize chemical, adsorption, and membrane methods. Chemical methods are difficult to scale due to their high treatment costs, while adsorption and membrane treatment systems carry the risk of secondary contamination. Furthermore, most existing perchlorate treatment systems fail to consider actual wastewater effluent requirements, resulting in high operating costs and poor load-shock resistance.

[0004] For example, patent number "CN202321532598.X" discloses a "Perchlorate Wastewater Treatment Device," which includes a sedimentation tank, a first adsorption column, a second adsorption column, and an adjustment pipe. The inlet of the sedimentation tank is connected to a water inlet pipe, and the outlet is connected to a water supply pipe. The inlets of the first and second adsorption columns are both connected to the water supply pipe, and the outlets are both connected to a water outlet pipe. One end of the adjustment pipe is connected to the water supply pipe between the first and second adsorption columns, and the other end is connected to the water outlet pipe between the first and second adsorption columns. The adjustment pipe is provided with a first on-off valve, a second on-off valve is provided on the water supply pipe between the inlet of the first adsorption column and one end of the adjustment pipe, and a third on-off valve is provided on the water outlet pipe between the other end of the adjustment pipe and the outlet of the second adsorption column. While perchlorate can be removed to a certain extent, its overall effect is average, the wastewater treatment efficiency is low, and the treatment scheme cannot be adjusted according to actual water discharge requirements, resulting in poor adaptability.

[0005] Therefore, a wastewater treatment device is proposed to solve the above problems. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an integrated perchlorate wastewater treatment transposition device with simple equipment, good perchlorate treatment effect and cost savings.

[0007] The technical solution of the utility model is:

[0008] A perchlorate wastewater integrated treatment device includes a pretreatment unit, a chemical dosing unit, a deep treatment unit, and a control unit. The pretreatment unit has a water inlet at one end and is connected to the deep treatment unit at the other end. The deep treatment unit has a water outlet. A transfer tank, a transfer pump, and a transfer switching valve are located between the pretreatment unit and the deep treatment unit. The liquid outlet of the transfer tank is connected to the deep treatment unit and the reuse port via the transfer pump and the transfer switching valve, respectively. The chemical dosing unit is connected to the pretreatment unit, and the control unit is electrically connected to the pretreatment unit, the chemical dosing unit, the deep treatment unit, the transfer pump, and the transfer switching valve. The treatment process can be flexibly adjusted according to the required effluent concentration, with strong adaptability and effective reduction in operating costs.

[0009] Preferably, the pretreatment unit (1) comprises at least one reaction tank and at least one sedimentation tank (15) connected to each other, each of the reaction tanks being provided with an agitator (16), a sludge pump (151) and a sludge outlet (154) being connected to the bottom of the sedimentation tank (15), and a liquid outlet of the sedimentation tank (15) being connected to the transfer tank (3).

[0010] Preferably, a baffle is provided at the liquid outlet of the sedimentation tank, and a first monitor is provided on the baffle, wherein the baffle is used to prevent floating mud on the surface of the clear liquid in the sedimentation tank from being discharged into the transfer tank.

[0011] Preferably, the drug dosing unit (2) comprises a first drug storage tank (21), a second drug storage tank (22), an alkali-soluble drug storage tank (23), a flocculant storage tank (24) and a dosing pump (25); the reaction tank comprises a primary reaction tank (11), a secondary reaction tank (12), a tertiary reaction tank (13) and a quaternary reaction tank (14) which are connected in sequence; the dosing pump (25) is connected to the first drug storage tank (21) and the primary reaction tank (11), the second drug storage tank (22) and the secondary reaction tank (12), the alkali-soluble drug storage tank (23) and the tertiary reaction tank (13), the flocculant storage tank (24) and the quaternary reaction tank (14), respectively; the control unit (5) is electrically connected to the dosing pump (25). A user can adjust the dosage of the drug dosing unit through the control unit.

[0012] Preferably, a pH detector and a second monitor are provided in the reaction tank, and the pH detector and the second monitor are electrically connected to the control unit. The pH detector and the second monitor are used to automatically adjust the flow rates of the dosing pumps of the alkali-soluble drug storage tank and the flocculant storage tank to maintain a good reaction environment in the tertiary reaction tank and the quaternary reaction tank.

[0013] Preferably, the deep processing unit includes a multi-media filter, a carbon filter tank and a resin tank connected in sequence, the water outlet end of the resin tank is connected to a clean water tank and a regeneration liquid tank, the clean water tank is provided with a water outlet, and the multi-media filter, the carbon filter tank and the resin tank are provided with an automatic control valve, so that the content of perchlorate in the waste liquid is further reduced after multi-stage filtration of the deep processing unit.

[0014] Preferably, it also includes a box body, and the pretreatment unit, chemical dosing unit, deep treatment unit and control unit are all located inside the box body to form an integrated structure. The box body is provided with through holes corresponding to the water inlet, sludge outlet, reuse outlet and water outlet to form a closed working environment.

[0015] Preferably, the box body is composed of a plurality of mutually interlocking partitions, and the box body is provided with movable doors corresponding to the drug dosing unit and the deep processing unit to facilitate daily inspection, maintenance and addition of drugs.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] 1. The integrated perchlorate wastewater treatment device of the present invention can add an appropriate amount of reagent to the pretreatment unit according to the perchlorate content, thereby avoiding waste of reagents and ensuring the effective removal of perchlorate in the wastewater.

[0018] 2. The integrated perchlorate wastewater treatment device of the present invention can choose whether to pass through the deep treatment unit according to the actual water outlet demand. The ion exchange resin of the subsequent deep treatment module can be used continuously for a long time and does not need to be regenerated for several months, which greatly reduces the operating cost.

[0019] 3. The integrated perchlorate wastewater treatment device of the present invention has strong resistance to shock loads, high purification efficiency, stable operation, and no secondary pollution.

[0020] 4. The integrated perchlorate wastewater treatment device of the present invention has an integrated closed box structure, which can effectively prevent irrelevant personnel from interfering with the operation of the equipment and avoid safety problems. At the same time, the box is composed of movable partitions, which is convenient for large-scale maintenance. At the same time, movable doors are provided on the sides of the chemical dosing unit and the deep treatment unit, which can be used for daily inspections and chemical addition.

[0021] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0023] Figure 2 This is the second schematic diagram of the internal structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall appearance of the utility model.

[0025] Component names and corresponding serial numbers: 1. Pretreatment unit; 11. Primary reaction tank; 111. Water inlet; 12. Secondary reaction tank; 13. Tertiary reaction tank; 131. pH detector; 14. Quaternary reaction tank; 141. Second monitor; 15. Sedimentation tank; 151. Sludge pump; 152. Baffle; 153. First monitor; 154. Sludge outlet; 16. Agitator; 2. Chemical dosing unit; 21. First chemical 1. Chemical storage tank; 22. Second chemical storage tank; 23. Alkali-soluble chemical storage tank; 24. Flocculant storage tank; 25. Dosing pump; 3. Transfer tank; 31. Transfer pump; 32. Transfer switching valve; 33. Reuse port; 4. Deep treatment unit; 41. Multi-media filter; 42. Carbon filter tank; 43. Resin tank; 44. Regeneration liquid tank; 45. Clear water tank; 46. Water outlet; 5. Control unit; 6. Box; 61. Movable door. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention, of which this embodiment is only a preferred embodiment.

[0027] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the usual meanings understood by persons having ordinary skills in the field to which this disclosure belongs. The words “include” or “comprise” and the like used in this disclosure mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words “connect” or “connected” and the like are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect.

[0028] like Figure 1-3As shown, a perchlorate wastewater integrated treatment device includes a pretreatment unit 1, a chemical dosing unit 2, a deep treatment unit 4 and a control unit 5. The pretreatment unit 1 is provided with a water inlet 111 at one end and connected to the deep treatment unit 4 at the other end. The deep treatment unit 4 is provided with a water outlet 46. A transfer tank 3, a transfer pump 31 and a transfer switching valve 32 are provided between the pretreatment unit 1 and the deep treatment unit 4. The liquid outlet end of the transfer tank 3 is connected to the deep treatment unit 4 and the reuse port 33 respectively through the transfer pump 31 and the transfer switching valve 32. The chemical dosing unit 2 is connected to the pretreatment unit 1. The control unit 5 is electrically connected to the pretreatment unit 1, the chemical dosing unit 2, the deep treatment unit 4, the transfer pump 31 and the transfer switching valve 32.

[0029] Specifically, the pretreatment unit 1 includes a primary reaction tank 11, a secondary reaction tank 12, a tertiary reaction tank 13, a quaternary reaction tank 14 and a sedimentation tank 15 connected in sequence. The primary reaction tank 11, the secondary reaction tank 12, the tertiary reaction tank 13 and the quaternary reaction tank 14 are all provided with an agitator 16. The bottom of the sedimentation tank 15 is connected to a sludge pump 151 and a sludge outlet 154. The liquid outlet of the sedimentation tank 15 is connected to the transfer tank 3.

[0030] Specifically, a baffle 152 is provided at the liquid outlet of the sedimentation tank 15, and a first monitor 153 is provided on the baffle 152; the baffle 152 is used to prevent part of the floating mud from being discharged into the transfer tank 3, affecting the water quality of the effluent; a monitoring device is provided on the baffle, and the operation status of the sedimentation tank 15 can be observed in real time on the control unit 5, which is easy to operate.

[0031] Specifically, the reagent dosing unit 2 includes a first reagent storage tank 21, a second reagent storage tank 22, an alkali-soluble drug storage tank 23, a flocculant storage tank 24 and a dosing pump 25. The dosing pump 25 is respectively connected to the first reagent storage tank 21 and the primary reaction tank 11, the second reagent storage tank 22 and the secondary reaction tank 12, the alkali-soluble drug storage tank 23 and the tertiary reaction tank 13, and the flocculant storage tank 24 and the quaternary reaction tank 14. The control unit 5 is electrically connected to the dosing pump 25.

[0032] The first agent can be any agent in the prior art that can remove perchlorate. This embodiment uses the perchlorate targeted remover produced by Hunan Aisenic Environmental Protection Technology Co., Ltd., which is available on the market.

[0033] The second agent can be any agent in the prior art that can remove perchlorate. In this embodiment, the guiding activator produced by Hunan Aisenic Environmental Protection Technology Co., Ltd. is selected, which can be purchased on the market.

[0034] The flocculant can be any flocculant with a flocculation effect in the prior art, such as polyacrylamide (PAM).

[0035] The addition of the reagent is achieved by adjusting the flow rate of the dosing pump 25 according to the influent water quality. The alkali dosage is controlled by a pH meter. The flocculant dosage is adjusted based on the precipitation effect according to the real-time monitoring equipment. Both the alkali and PAM are existing products. The alkali can be one or a combination of sodium hydroxide, sodium carbonate, calcium oxide, or calcium hydroxide. The PAM is a cationic or non-ionic type with a molecular weight greater than 15 million.

[0036] The amount of reagent added can be adjusted to adapt to wastewater with different inlet conditions, which not only ensures that the effluent water quality meets the standards, but also reduces the operating burden of the device. For example, when the effluent water quality requirements are low, the amount of reagent added can be reduced so that there is no excess reagent in the pretreatment unit 1, and no excess load is added to the agitator 16, thereby improving the overall load impact resistance of the device.

[0037] Specifically, a pH detector 131 is provided in the tertiary reaction tank 13 , and a second monitor 141 is provided in the quaternary reaction tank 14 . The pH detector 131 and the second monitor 141 are electrically connected to the control unit 5 .

[0038] Specifically, the deep treatment unit 4 includes a multi-media filter 41, a carbon filter canister 42, and a resin tank 43, which are connected in sequence. The water outlet of the resin tank 43 is connected to a clear water tank 45 and a regeneration liquid tank 44. The clear water tank 45 is provided with a water outlet 46. The multi-media filter 41, the carbon filter canister 42, and the resin tank 43 are provided with automatic control valves. The automatic control valves can be commercially available fully automatic hydraulic control valves, which are mature and well-known in the art and are therefore not repeated in this specification.

[0039] The multi-media filter 41 is filled with gravel, quartz sand, magnetite, etc. of different specific gravities or particle sizes. When the raw water passes through the filter material, the suspended matter in the water is intercepted by the filter layer surface due to adsorption and mechanical resistance.

[0040] The carbon filter tank 42 is filled with activated carbon, which has a significant adsorption and removal effect on odor, colloids, pigments and heavy metal ions in the water, thereby improving water quality and effectively ensuring the service life of the subsequent equipment;

[0041] The resin tank 43 is filled with perchlorate adsorption resin (a product currently available on the market) to adsorb and remove residual perchlorate in the wastewater;

[0042] Since the resin may become contaminated after long-term use, which may lead to a decrease in adsorption capacity, a regeneration liquid tank 44 is provided. The regeneration liquid tank 44 is equipped with a regeneration liquid formed by a combination of one or more of acid, alkali and saturated sodium chloride. When the adsorption capacity of the resin in the resin tank 43 decreases, the regeneration liquid can be sucked into the resin tank 43 through the automatic control valve. The automatic control valve itself has a regeneration function. When regeneration is required, it will automatically absorb the regeneration liquid to restore the adsorption capacity of the resin.

[0043] The clean water tank 45, as the terminal equipment for wastewater treatment, can not only stabilize the water quality and water pressure of the effluent, but also store clean water, balance the water volume, and ensure the normal operation of the next link.

[0044] By setting the parameters of the automatic control valve, it is possible to control the operating time or water volume of the equipment, and also realize the automatic backwash function: in normal use, the transfer pump 31 transports the pretreated wastewater to the deep treatment unit 4, and the water flows through the filter materials in the multi-media filter 41, the carbon filter tank 42 and the resin tank 43, entering from the top and exiting from the bottom. When backwashing is required, the flow channel of the automatic control valve will be switched, and the water pumped by the transfer pump 31 will enter from the bottom and exit from the top to flush the filter materials in the deep treatment unit 4.

[0045] Specifically, the apparatus further includes a housing 6, wherein the pretreatment unit 1, the reagent dosing unit 2, the deep treatment unit 4, and the control unit 5 are all located within the housing 6 to form an integrated structure. The housing 6 is provided with through holes corresponding to the water inlet 111, the sludge outlet 154, the recycling outlet 33, and the water outlet 46. The housing 6 forms an integrated, enclosed device, which effectively prevents unauthorized personnel from interfering with the operation of the device and avoiding safety issues.

[0046] Specifically, the box body 6 is composed of a plurality of mutually interlocking partitions, which is convenient for large-scale maintenance of the device; the box body 6 is provided with movable doors 61 corresponding to the reagent dosing unit 2 and the deep processing unit 4, which can be used for daily inspections and reagent addition.

[0047] The working process and principle of the integrated perchlorate wastewater treatment device in this embodiment are as follows: wastewater enters the pretreatment unit 1 from the water inlet 111; in the primary reaction tank 11 of the pretreatment unit 1, a first agent is added to remove most of the perchlorate; in the secondary reaction tank 12, a second agent is added to further remove the perchlorate and at the same time has a certain adsorption effect on pollutants in the wastewater; in the tertiary reaction tank 13, an alkaline agent is added to adjust the pH value of the wastewater to the optimal use condition; in the quaternary reaction tank 14, a flocculant such as PAM is added to neutralize the precipitate formed in the wastewater through electrical bridging adsorption. The fine flocs quickly condense into large particles; the wastewater after the reaction enters the sedimentation tank 15 for solid-liquid separation, and the clear liquid enters the transfer tank 3. During actual operation, it is selected to enter the reuse port 33 or continue to enter the deep treatment unit according to the actual requirements of the effluent. If the effluent water quality requirement is low, the transfer tank 3 directly transports the clear liquid to the reuse port 33; if the effluent water quality requirement is high and deep treatment is required, the transfer pump 31 pumps the clear liquid from the sedimentation tank 15 into the deep treatment unit 4, and after deep treatment of the pollutants through the multi-media filter 41, carbon filter tank 42, and resin tank 43, a low-concentration perchlorate effluent is obtained.

[0048] The above is a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent substitutions or changes based on the technical solution and concept of the present invention, should be covered by the protection scope of the claims of the present invention.

Claims

1. An integrated perchlorate wastewater treatment device, characterized by: The invention comprises a pretreatment unit (1), a reagent dosing unit (2), a deep treatment unit (4) and a control unit (5); one end of the pretreatment unit (1) is provided with a water inlet (111), and the other end is connected to the deep treatment unit (4); the deep treatment unit (4) is provided with a water outlet (46); a transfer tank (3), a transfer pump (31) and a transfer switching valve (32) are provided between the pretreatment unit (1) and the deep treatment unit (4); the liquid outlet end of the transfer tank (3) is connected to the deep treatment unit (4) and the reuse port (33) through the transfer pump (31) and the transfer switching valve (32); the reagent dosing unit (2) is connected to the pretreatment unit (1); and the control unit (5) is electrically connected to the pretreatment unit (1), the reagent dosing unit (2), the deep treatment unit (4), the transfer pump (31) and the transfer switching valve (32).

2. The integrated perchlorate wastewater treatment device according to claim 1, characterized in that: The pretreatment unit (1) comprises at least one reaction tank and at least one sedimentation tank (15) which are connected to each other. A stirrer (16) is provided in each reaction tank. The bottom of the sedimentation tank (15) is connected to a sludge pump (151) and a sludge outlet (154). The liquid outlet of the sedimentation tank (15) is connected to the transfer tank (3).

3. The integrated perchlorate wastewater treatment device according to claim 2, characterized in that: A baffle (152) is provided at the liquid outlet of the sedimentation tank (15), and a first monitor (153) is provided on the baffle (152).

4. The integrated perchlorate wastewater treatment device according to claim 2, characterized in that: The drug dosing unit (2) includes a first drug storage tank (21), a second drug storage tank (22), an alkali-soluble drug storage tank (23), a flocculant storage tank (24) and a dosing pump (25); the reaction tank includes a primary reaction tank (11), a secondary reaction tank (12), a tertiary reaction tank (13) and a quaternary reaction tank (14) which are connected in sequence; the dosing pump (25) is connected to the first drug storage tank (21) and the primary reaction tank (11), the second drug storage tank (22) and the secondary reaction tank (12), the alkali-soluble drug storage tank (23) and the tertiary reaction tank (13), the flocculant storage tank (24) and the quaternary reaction tank (14), respectively; the control unit (5) is electrically connected to the dosing pump (25).

5. The integrated perchlorate wastewater treatment device according to claim 3, characterized in that: A pH detector (131) and a second monitor (141) are provided in the reaction tank, and the pH detector (131) and the second monitor (141) are electrically connected to the control unit (5).

6. The integrated perchlorate wastewater treatment device according to claim 1, characterized in that: The deep treatment unit (4) comprises a multi-media filter (41), a carbon filter tank (42) and a resin tank (43) which are connected in sequence. The water outlet of the resin tank (43) is connected to a clean water tank (45) and a regeneration liquid tank (44). The clean water tank (45) is provided with a water outlet (46). The multi-media filter (41), the carbon filter tank (42) and the resin tank (43) are provided with automatic control valves.

7. The integrated perchlorate wastewater treatment device according to any one of claims 1 to 6, characterized in that: The system further comprises a box (6), wherein the pretreatment unit (1), the reagent dosing unit (2), the deep treatment unit (4) and the control unit (5) are all located inside the box (6) to form an integrated structure, and the box (6) is provided with through holes corresponding to the water inlet (111), the sludge outlet (154), the reuse outlet (33) and the water outlet (46).

8. The integrated perchlorate wastewater treatment device according to claim 7, characterized in that: The box body (6) is composed of a plurality of mutually interlocking partitions, and the box body (6) is provided with movable doors (61) at locations corresponding to the drug dosing unit (2) and the deep processing unit (4).

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