Pesticide industry phosphorus-containing wastewater treatment device

Abstract

The utility model discloses a kind of phosphorus-containing wastewater treatment devices in pesticide industry, comprising: low-concentration wastewater pretreatment device, high-concentration wastewater pretreatment device, distribution pool, A² / O biochemical pool, MBR membrane pool, chemical phosphorus removal device and secondary sedimentation tank, the low-concentration wastewater pretreatment device is suitable for the pretreatment of low-concentration phosphorus-containing wastewater;The high-concentration wastewater pretreatment device is suitable for the pretreatment of high-concentration phosphorus-containing wastewater;The distribution pool is respectively communicated with the low-concentration wastewater pretreatment device and high-concentration wastewater pretreatment device, and the distribution pool is suitable for mixing high-concentration wastewater and low-concentration wastewater after pretreatment;The A² / O biochemical pool is communicated with the distribution pool, and the A² / O biochemical pool is suitable for removing COD, BOD and denitrification phosphorus removal;The MBR membrane pool is communicated with the A² / O biochemical pool.The utility model can pretreat high and low concentration wastewater respectively and realize stable phosphorus removal, ensure that effluent reaches discharge standard.

Description

Technical Field

[0001] This utility model relates to a device for treating phosphorus-containing wastewater in the pesticide industry. Background Technology

[0002] Currently, wastewater generated by the pesticide production industry typically contains high concentrations of organophosphorus compounds and inorganic phosphates. This type of wastewater is characterized by its complex composition, poor biodegradability, high toxicity, and difficulty in treatment. Traditional single wastewater treatment processes are often insufficient to effectively remove phosphorus from this type of wastewater, especially to achieve stable discharge compliance.

[0003] A search of existing technologies revealed a Chinese patent (CN108821517A) disclosing a wastewater treatment device and method. This device includes a pretreatment unit, a nitrogen and phosphorus removal unit, and a sludge-water separation unit. It achieves biological nitrogen and phosphorus removal through a combination of anaerobic, anoxic, and aerobic tanks, and employs MBR membrane technology for sludge-water separation. However, the existing technology does not perform separate pretreatment for wastewater of different concentrations. Directly introducing high-concentration wastewater into the anaerobic, anoxic, and aerobic tanks can easily affect microorganisms, making it difficult to ensure that the phosphorus content in the effluent consistently meets standards. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a phosphorus-containing wastewater treatment device for the pesticide industry. It can pre-treat high and low concentration wastewater separately and achieve stable phosphorus removal to ensure that the effluent meets the discharge standards.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a phosphorus-containing wastewater treatment device for the pesticide industry, comprising:

[0006] A low-concentration wastewater pretreatment device, which is suitable for pretreating low-concentration phosphorus-containing wastewater;

[0007] A high-concentration wastewater pretreatment device, which is suitable for pretreating high-concentration phosphorus-containing wastewater;

[0008] A water distribution tank is connected to both the low-concentration wastewater pretreatment device and the high-concentration wastewater pretreatment device. The water distribution tank is suitable for mixing the pretreated high-concentration wastewater and low-concentration wastewater.

[0009] The A² / O biological treatment tank is connected to the water distribution tank and is suitable for removing COD, BOD and denitrifying and removing phosphorus.

[0010] The MBR membrane tank is connected to the A² / O biochemical tank and is suitable for solid-liquid separation and retention of suspended solids and particulate phosphorus.

[0011] A chemical phosphorus removal device is connected to the MBR membrane tank and is adapted to add chemical agents to remove dissolved phosphates.

[0012] The secondary sedimentation tank is connected to the chemical phosphorus removal device and is suitable for mud-water separation.

[0013] Furthermore, the low-concentration wastewater pretreatment device includes:

[0014] A primary sedimentation tank, which is suitable for removing floating matter from low-concentration wastewater;

[0015] A low-concentration equalization tank, which is connected to the primary sedimentation tank.

[0016] Furthermore, the high-concentration wastewater pretreatment device includes:

[0017] A neutralization tank, wherein the neutralization tank is adapted to adjust the pH value of high-concentration wastewater;

[0018] A sedimentation tank, which is connected to the neutralization tank, is adapted to remove sediment;

[0019] A high-concentration equalization tank, which is connected to the sedimentation tank;

[0020] The UASB tank is connected to the high-concentration conditioning tank. The UASB tank has an inlet at the bottom and an outlet at the top.

[0021] Furthermore, pesticide industry phosphorus-containing wastewater treatment devices also include centrifugal blowers;

[0022] The low-concentration regulating tank is equipped with a first aeration device, which is connected to the centrifugal blower.

[0023] Furthermore, pesticide industry phosphorus-containing wastewater treatment devices also include centrifugal blowers;

[0024] The neutralization tank is equipped with a second aeration device, which is connected to the centrifugal blower.

[0025] Furthermore, pesticide industry phosphorus-containing wastewater treatment devices also include centrifugal blowers;

[0026] The A² / O biochemical tank includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence. The bottom of the aerobic tank is equipped with a third aeration device, which is connected to the centrifugal blower.

[0027] Furthermore, the pesticide industry phosphorus-containing wastewater treatment device also includes a membrane aeration blower; the MBR membrane tank is equipped with a membrane aeration device, which is connected to the membrane aeration blower.

[0028] Furthermore, the pesticide industry phosphorus-containing wastewater treatment device also includes a sludge treatment device, which comprises:

[0029] The sludge thickening tank is connected to the sludge discharge ports of the low-concentration wastewater pretreatment device, the high-concentration wastewater pretreatment device, the secondary sedimentation tank, the MBR membrane tank, and the chemical phosphorus removal device.

[0030] A sludge dewatering machine, wherein the sludge dewatering machine is connected to the sludge thickening tank;

[0031] A sludge drying device, which is connected to the sludge dewatering machine.

[0032] Furthermore, the pesticide industry phosphorus-containing wastewater treatment device also includes a sludge return device, which includes a first return pump and a second return pump. The first return pump returns a portion of the sludge from the secondary sedimentation tank to the A² / O biological treatment tank, and the second return pump returns a portion of the sludge from the MBR membrane tank to the A² / O biological treatment tank.

[0033] Furthermore, the pesticide industry phosphorus-containing wastewater treatment device also includes an effluent pool, which is connected to the secondary sedimentation tank.

[0034] By adopting the above technical solution, this utility model has the following beneficial effects:

[0035] In this invention, during operation, a low-concentration wastewater pretreatment device pretreats low-concentration phosphorus-containing wastewater, and a high-concentration wastewater pretreatment device pretreats high-concentration phosphorus-containing wastewater. The pretreated high-concentration wastewater and low-concentration wastewater are mixed in a distribution tank and then enter an A² / O biochemical tank for denitrification and phosphorus removal. The treated wastewater enters an MBR membrane tank for solid-liquid separation and to remove suspended solids and particulate phosphorus. The effluent enters a chemical phosphorus removal device where chemical agents are added to remove dissolved phosphates. After passing through a secondary sedimentation tank for sludge-water separation, the effluent meets discharge standards, ensuring that the total phosphorus concentration in the effluent meets the discharge standards.

[0036] In addition, the primary sedimentation tank of the low-concentration wastewater pretreatment device removes floating matter from the low-concentration wastewater; the neutralization tank of the high-concentration wastewater pretreatment device adjusts the pH value of the high-concentration wastewater to ensure that the wastewater is within a suitable pH range for subsequent treatment; the UASB tank has an inlet at the bottom and an outlet at the top, and through anaerobic treatment, it hydrolyzes and acidifies complex organic phosphorus compounds into small molecule organic matter; centrifugal blowers provide aeration for the aerobic tanks in the low-concentration equalization tank, neutralization tank, and A² / O biological treatment tank to ensure the dissolved oxygen requirements in the biological treatment process; membrane aeration blowers provide membrane aeration for the MBR membrane tank; the sludge treatment device, consisting of a sludge thickening tank, sludge dewatering machine, and sludge drying device, realizes the thickening, dewatering, and drying of sludge to reduce sludge volume; the sludge return device returns part of the sludge from the secondary sedimentation tank and MBR membrane tank to the A² / O biological treatment tank to maintain an appropriate sludge concentration in the biological treatment tank.

[0037] In summary, this invention achieves the removal of phosphorus-containing wastewater from the pesticide industry, and the effluent quality meets the discharge standards. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the principle of the pesticide industry phosphorus-containing wastewater treatment device of this utility model. Detailed Implementation

[0039] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0040] like Figure 1 As shown, a device for treating phosphorus-containing wastewater from the pesticide industry includes:

[0041] Low-concentration wastewater pretreatment device, suitable for pretreatment of low-concentration phosphorus-containing wastewater;

[0042] High-concentration wastewater pretreatment device, suitable for pretreatment of high-concentration phosphorus-containing wastewater;

[0043] Water distribution tank 1 is connected to a low-concentration wastewater pretreatment device and a high-concentration wastewater pretreatment device respectively. Water distribution tank 1 is suitable for mixing the pretreated high-concentration wastewater and low-concentration wastewater.

[0044] A² / O biological treatment tank 2 is connected to water distribution tank 1. A² / O biological treatment tank 2 is suitable for removing COD and BOD and removing nitrogen and phosphorus.

[0045] MBR membrane tank 3 is connected to A² / O biochemical tank 2. MBR membrane tank 3 is suitable for solid-liquid separation and retention of suspended solids and particulate phosphorus.

[0046] Chemical phosphorus removal device 4 is connected to MBR membrane tank 3 and is suitable for adding chemical agents to remove dissolved phosphates.

[0047] Secondary sedimentation tank 5 is connected to chemical phosphorus removal device 4 and is suitable for mud-water separation.

[0048] In this embodiment, as Figure 1 As shown, the low-concentration wastewater pretreatment device pretreats low-concentration phosphorus-containing wastewater, and the high-concentration wastewater pretreatment device pretreats high-concentration phosphorus-containing wastewater. The pretreated high-concentration wastewater and low-concentration wastewater are mixed in the distribution tank 1 and then enter the A² / O biological treatment tank 2 for denitrification and phosphorus removal. The treated wastewater enters the MBR membrane tank 3 for solid-liquid separation and interception of suspended solids and particulate phosphorus. The effluent enters the chemical phosphorus removal device 4 to add chemical agents to remove dissolved phosphates. After passing through the secondary sedimentation tank 5 for sludge-water separation, it meets the discharge standards, so that the total phosphorus concentration of the effluent meets the discharge standards.

[0049] In this embodiment, after the wastewater flows out of the MBR membrane tank 3, it enters the chemical phosphorus removal device 4. This device is used to remove soluble phosphates from the wastewater. The chemical phosphorus removal device 4 is existing technology and consists of a reagent storage tank, a metering pump, and a mixing reaction tank. During operation, the chemical reagent is added to the wastewater flowing out of the MBR membrane tank 3 through the metering pump. The reagent reacts rapidly with the residual soluble phosphates in the wastewater through chemical precipitation or coagulation, generating water-insoluble solid particles.

[0050] After the water has fully reacted in the chemical phosphorus removal device 4, the resulting precipitate flows into the subsequent secondary sedimentation tank 5 for sludge-water separation. Since chemical phosphorus removal is a conventional technique in water treatment, its specific equipment structure and operation control are well known to those skilled in the art, and therefore will not be described in detail here.

[0051] Specifically, such as Figure 1 As shown, the low-concentration wastewater pretreatment device includes:

[0052] Primary sedimentation tank 7 is suitable for removing floating matter from low-concentration wastewater;

[0053] Low-concentration equalization tank 8 is connected to primary sedimentation tank 7.

[0054] In this embodiment, as Figure 1As shown, the low-concentration wastewater pretreatment device achieves the pretreatment of low-concentration phosphorus-containing wastewater through the series configuration of primary sedimentation tank 7 and low-concentration equalization tank 8. The primary sedimentation tank 7 is located upstream of the low-concentration equalization tank 8. The low-concentration wastewater first enters the primary sedimentation tank 7 to remove floating matter in the wastewater. The wastewater treated by the primary sedimentation tank 7 flows into the low-concentration equalization tank 8. The low-concentration equalization tank 8 equalizes and regulates the water quality and quantity of the wastewater, mitigating the impact of water quality fluctuations on the subsequent A² / O biological treatment tank 2 process.

[0055] In some embodiments, the number of primary sedimentation tanks 7 is not limited to one; multiple primary sedimentation tanks 7 can be set up and operated in parallel according to the treatment water volume requirements. The volume of the low-concentration equalization tank 8 can be adjusted according to the variation of wastewater volume and the influent requirements of subsequent treatment processes.

[0056] Specifically, such as Figure 1 As shown, the high-concentration wastewater pretreatment device includes:

[0057] Neutralization tank 9 is suitable for adjusting the pH value of high-concentration wastewater;

[0058] Sedimentation tank 10 is connected to neutralization tank 9, and sedimentation tank 10 is suitable for removing sediment;

[0059] High-concentration equalization tank 11 is connected to sedimentation tank 10;

[0060] UASB tank 12 is connected to high concentration equalization tank 11. UASB tank 12 has an inlet at the bottom and an outlet at the top.

[0061] In this embodiment, as Figure 1 As shown, the high-concentration wastewater pretreatment device achieves pretreatment of high-concentration phosphorus-containing wastewater through a series configuration of neutralization tank 9, sedimentation tank 10, high-concentration equalization tank 11, and UASB tank 12. The high-concentration wastewater first enters neutralization tank 9, where acidic or alkaline chemical agents are added to adjust the pH value of the wastewater to a suitable range. The treated wastewater then enters sedimentation tank 10, where sediment is removed. The wastewater treated by sedimentation tank 10 flows into high-concentration equalization tank 11 for equalization and equalization of water quality and quantity.

[0062] Wastewater enters UASB tank 12 from high-concentration equalization tank 11. UASB tank 12 has an inlet at the bottom and an outlet at the top. After entering from the bottom inlet, the wastewater flows from bottom to top and undergoes anaerobic biological treatment in UASB tank 12, which decomposes the complex organic phosphorus compounds in the wastewater into small molecule organic matter. The treated wastewater flows out from the top outlet and enters water distribution tank 1.

[0063] Specifically, such as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a centrifugal blower 13;

[0064] The low-concentration equalization tank 8 is equipped with a first aeration device, which is connected to the centrifugal blower 13.

[0065] Specifically, such as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a centrifugal blower 13;

[0066] The neutralization tank 9 is equipped with a second aeration device, which is connected to the centrifugal blower 13.

[0067] Specifically, such as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a centrifugal blower 13;

[0068] The A² / O biochemical tank 2 includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence. A third aeration device is provided at the bottom of the aerobic tank, and the third aeration device is connected to a centrifugal blower 13.

[0069] In this embodiment, as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a centrifugal blower 13, which provides air for aeration in multiple tanks. A first aeration device is installed in the low-concentration equalization tank 8, which is connected to the centrifugal blower 13 through a pipeline. The compressed air generated by the centrifugal blower 13 is transported to the first aeration device through a pipeline, and the first aeration device disperses and releases the compressed air into the wastewater in the low-concentration equalization tank 8. A second aeration device is installed in the neutralization tank 9, which is connected to the centrifugal blower 13 through a pipeline. The second aeration device receives the compressed air provided by the centrifugal blower 13 and releases it into the neutralization tank 9. The A² / O biological treatment tank 2 includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence. A third aeration device is installed at the bottom of the aerobic tank, which is connected to the centrifugal blower 13 through a pipeline to provide dissolved oxygen for the aerobic microorganisms in the aerobic tank.

[0070] The first aeration device, the second aeration device, the third aeration device, and the membrane aeration device mentioned later can all adopt mature aeration components in the prior art, such as microporous aeration discs, perforated aeration pipes, or other forms of aerators. The function of these components is to disperse and release the compressed air provided by the centrifugal blower 13 or the membrane aeration blower 14 into the wastewater. Their specific structures are well known to those skilled in the art, and therefore will not be described in detail here.

[0071] In addition, MBBR packing material can be added to the anoxic and aerobic tanks. This serves as an attachment carrier for microorganisms, increasing biomass within the tanks, improving COD and BOD removal efficiency, and enhancing denitrification efficiency.

[0072] Specifically, such as Figure 1As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a membrane aeration blower 14;

[0073] The MBR membrane tank 3 is equipped with a membrane aeration device, which is connected to the membrane aeration blower 14.

[0074] Specifically, such as Figure 1 As shown, the pesticide industry's phosphorus-containing wastewater treatment equipment also includes a sludge treatment device, which comprises:

[0075] The sludge thickening tank (not shown in the figure) is connected to the sludge discharge ports of the low-concentration wastewater pretreatment device, the high-concentration wastewater pretreatment device, the secondary sedimentation tank 5, the MBR membrane tank 3, and the chemical phosphorus removal device 4.

[0076] Sludge dewatering machine 16 is connected to sludge thickening tank;

[0077] The sludge drying device 17 is connected to the sludge dewatering machine 16.

[0078] Specifically, such as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes a sludge return device, which includes a first return pump and a second return pump. The first return pump returns part of the sludge from the secondary sedimentation tank 5 to the A² / O biological treatment tank 2, and the second return pump returns part of the sludge from the MBR membrane tank 3 to the A² / O biological treatment tank 2.

[0079] Specifically, such as Figure 1 As shown, the pesticide industry phosphorus-containing wastewater treatment device also includes an effluent tank 6, which is connected to the secondary sedimentation tank 5.

[0080] In this embodiment, as Figure 1 As shown, the sludge treatment device achieves centralized sludge treatment through a series configuration of a sludge thickening tank, a sludge dewatering machine 16, and a sludge drying device 17. The sludge generated by each treatment device is transported to the sludge thickening tank through pipelines for gravity thickening to reduce the sludge moisture content. The thickened sludge enters the sludge dewatering machine 16 for mechanical dewatering to further remove free water from the sludge. The dewatered sludge enters the sludge drying device 17 for drying treatment, finally forming dry sludge. The dry sludge will be temporarily stored in the hazardous waste storage room and handed over to a qualified unit for disposal.

[0081] The sludge return device realizes the recycling of sludge through a first return pump and a second return pump. The first return pump extracts part of the settled sludge from the bottom of the secondary sedimentation tank 5 and pumps it back to the A² / O biological treatment tank 2. The second return pump extracts part of the activated sludge from the MBR membrane tank 3 and pumps it back to the A² / O biological treatment tank 2 to maintain an appropriate sludge concentration in the A² / O biological treatment tank 2. The effluent tank 6 receives the supernatant from the secondary sedimentation tank 5 and stores it temporarily. Part of it is discharged to the outside as compliant water, and part of it is reused as greywater.

[0082] The above specific embodiments further illustrate the technical problems solved by this utility model, the technical solutions, and the beneficial effects. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for treating phosphorus-containing wastewater from the pesticide industry, characterized in that, include: A low-concentration wastewater pretreatment device, which is suitable for pretreating low-concentration phosphorus-containing wastewater; A high-concentration wastewater pretreatment device, which is suitable for pretreating high-concentration phosphorus-containing wastewater; Water distribution tank (1), which is connected to the low-concentration wastewater pretreatment device and the high-concentration wastewater pretreatment device respectively, and the water distribution tank (1) is suitable for mixing the pretreated high-concentration wastewater and low-concentration wastewater; A² / O biological treatment tank (2), which is connected to the water distribution tank (1), is suitable for removing COD, BOD and removing nitrogen and phosphorus; MBR membrane tank (3), which is connected to the A² / O biochemical tank (2), is suitable for solid-liquid separation and retention of suspended solids and particulate phosphorus; A chemical phosphorus removal device (4) is connected to the MBR membrane tank (3), and the chemical phosphorus removal device (4) is suitable for adding chemical agents to remove soluble phosphates; Secondary sedimentation tank (5), which is connected to the chemical phosphorus removal device (4), is suitable for mud-water separation.

2. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, The low-concentration wastewater pretreatment device includes: Primary sedimentation tank (7), which is suitable for removing floating matter from low-concentration wastewater; The low-concentration equalization tank (8) is connected to the primary sedimentation tank (7).

3. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, The high-concentration wastewater pretreatment device includes: Neutralization tank (9), said neutralization tank (9) is adapted to adjust the pH value of high-concentration wastewater; A sedimentation tank (10) is connected to the neutralization tank (9), and the sedimentation tank (10) is adapted to remove sediment; A high-concentration equalization tank (11) is connected to the sedimentation tank (10); The UASB tank (12) is connected to the high concentration conditioning tank (11). The UASB tank (12) has an inlet at the bottom and an outlet at the top.

4. The pesticide industry phosphorus-containing wastewater treatment device according to claim 2, characterized in that, It also includes centrifugal blowers (13); The low-concentration regulating tank (8) is equipped with a first aeration device, which is connected to the centrifugal blower (13).

5. The pesticide industry phosphorus-containing wastewater treatment device according to claim 3, characterized in that, It also includes centrifugal blowers (13); The neutralization tank (9) is equipped with a second aeration device, which is connected to the centrifugal blower (13).

6. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, It also includes centrifugal blowers (13); The A² / O biochemical tank (2) includes an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence. The bottom of the aerobic tank is provided with a third aeration device, which is connected to the centrifugal blower (13).

7. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, It also includes membrane aeration blowers (14); The MBR membrane tank (3) is equipped with a membrane aeration device, which is connected to the membrane aeration blower (14).

8. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, It also includes a sludge treatment device, which comprises: The sludge thickening tank is connected to the sludge discharge ports of the low-concentration wastewater pretreatment device, the high-concentration wastewater pretreatment device, the secondary sedimentation tank (5), the MBR membrane tank (3), and the chemical phosphorus removal device (4). Sludge dewatering machine (16), the sludge dewatering machine (16) is connected to the sludge thickening tank; The sludge drying device (17) is connected to the sludge dewatering machine (16).

9. The pesticide industry phosphorus-containing wastewater treatment device according to claim 8, characterized in that, It also includes a sludge return device, which includes a first return pump and a second return pump. The first return pump returns part of the sludge from the secondary sedimentation tank (5) to the A² / O biological treatment tank (2), and the second return pump returns part of the sludge from the MBR membrane tank (3) to the A² / O biological treatment tank (2).

10. The pesticide industry phosphorus-containing wastewater treatment device according to claim 1, characterized in that, It also includes an outlet pool (6), which is connected to the secondary sedimentation tank (5).

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