A secondary coagulation and sedimentation system for municipal solid waste leachate

Abstract

This utility model discloses a secondary coagulation and sedimentation system for municipal solid waste leachate, comprising: a first reaction tank with a built-in first stirring device; a second reaction tank with its inlet connected to the outlet of the first reaction tank and a built-in second stirring device, the second stirring device having the same or different stirring speed as the first stirring device; a sedimentation tank with its inlet connected to the outlet of the second reaction tank and its outlet connected to a subsequent treatment device; a dosing assembly with its outlet connected to both the first and second reaction tanks to allow the addition of different reagents; and a detection assembly including a first detection element and a second detection element, both electrically connected to the dosing assembly. The first detection element is located in the first reaction tank and is used to detect the water quality in the first reaction tank, and the second detection element is located in the second reaction tank and is used to detect the water quality in the second reaction tank. This utility model can improve the pretreatment effect of municipal solid waste leachate.

Description

Technical Field

[0001] This utility model relates to the field of waste treatment technology, and in particular to a secondary coagulation and sedimentation system for leachate from municipal solid waste. Background Technology

[0002] Municipal solid waste leachate refers to a dark brown, foul-smelling liquid containing high concentrations of organic pollutants, heavy metals, pathogens, and toxic substances, produced during the dumping or landfilling of waste due to compaction, fermentation, and rainwater leaching. Its composition is complex, including ammonia nitrogen, COD (chemical oxygen demand), BOD (biochemical oxygen demand), salts, and various carcinogens (such as polycyclic aromatic hydrocarbons).

[0003] If leachate is released directly into the environment without treatment, it will severely pollute soil and groundwater, leading to eutrophication and damaging ecosystems. Heavy metals accumulate through the food chain, threatening human health and causing diseases such as cancer and liver and kidney damage. Pathogenic microorganisms in leachate may also spread diseases. Therefore, leachate is classified as a high-risk pollutant and must be strictly collected and treated using physical, chemical, and biological processes to meet standards before being discharged.

[0004] Traditional methods for pretreating municipal solid waste leachate often employ a single reaction tank structure with aeration and mixing. This approach suffers from drawbacks such as the inability to add different chemicals based on varying wastewater qualities and the inability to adjust the stirring speed, leading to incomplete mixing. Therefore, there is an urgent need to research and develop a secondary coagulation and sedimentation system for municipal solid waste leachate to address these technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a secondary coagulation and sedimentation system for municipal solid waste leachate, which can improve the pretreatment effect of municipal solid waste leachate.

[0006] To achieve the above objectives, this utility model provides a secondary coagulation and sedimentation system for municipal solid waste leachate, the specific implementation of which is as follows:

[0007] A secondary coagulation and sedimentation system for municipal solid waste leachate includes:

[0008] The first reaction tank has a built-in first stirring device;

[0009] The second reaction tank has an inlet that is connected to the outlet of the first reaction tank and has a built-in second stirring device. The stirring speed of the second stirring device may be the same as or different from that of the first stirring device.

[0010] The sedimentation tank has its inlet connected to the outlet of the second reaction tank, and its outlet is connected to the subsequent treatment device.

[0011] The dosing assembly has a dosing outlet that is connected to the first reaction tank and the second reaction tank respectively, so as to add different agents into the first reaction tank and the second reaction tank;

[0012] The detection assembly includes a first detection element and a second detection element, both of which are electrically connected to the dosing assembly. The first detection element is disposed in the first reaction tank to detect the water quality in the first reaction tank, and the second detection element is disposed in the second reaction tank to detect the water quality in the second reaction tank.

[0013] In some embodiments, the dosing assembly includes an alkali agent reservoir, a flocculant reservoir, and a coagulant aid reservoir. The outlet of the alkali agent reservoir is connected to the first reaction tank via a first administration pipe. The outlet of the flocculant reservoir is connected to the first reaction tank via a second administration pipe. The outlet of the coagulant aid reservoir is connected to the second reaction tank via a third administration pipe.

[0014] In some embodiments, the alkaline agent solution storage section, the flocculant solution storage section, and the coagulant aid solution storage section are all equipped with stirring rods, and each stirring rod is drivenly connected to an external stirring motor.

[0015] In some embodiments, the first, second, and third drug delivery lines are each equipped with a drug delivery pump, a drug delivery valve, and a metering valve, wherein the metering valve is electrically connected to the first or second detection element.

[0016] In some embodiments, the alkaline agent reservoir, the flocculant reservoir, and the coagulant aid reservoir are all connected to the water supply network.

[0017] In some embodiments, both the first and second detection elements are water quality sensors.

[0018] In some embodiments, a sludge discharge pipe is provided at the bottom of the sedimentation tank, and a sludge discharge pump and a sludge discharge valve are provided on the sludge discharge pipe. The outlet of the sludge discharge pipe is used to discharge sludge or discharge it into sludge treatment equipment.

[0019] In some embodiments, a water distributor is provided in the sedimentation tank, the sludge outlet of the sedimentation tank is located below the water distributor, and a biological packing layer is provided between the water distributor and the sludge outlet.

[0020] In some embodiments, a first return pipe is provided on the sewage pipe, the outlet of the first return pipe extending into the first reaction tank and / or the second reaction tank, for returning sludge to the first reaction tank and / or the second reaction tank.

[0021] Based on the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0022] 1. By setting up a first reaction tank and a second reaction tank to treat wastewater in sequence, the dosing component can add different types of agents to the first and second reaction tanks according to the water quality detected by the first and second detectors of the detection component. The first and second stirring devices are each set with independent stirring rates according to the water quality of the wastewater and the type of agent added, so as to improve the coagulation reaction effect, improve the pretreatment effect of domestic waste leachate, and achieve the effect of efficient and stable removal of pollutants.

[0023] 2. By configuring the dosing assembly into an alkaline agent reservoir, a flocculant reservoir, and a coagulant aid reservoir, with the outlet of the alkaline agent reservoir connected to the first reaction tank via a first dosing pipe, the outlet of the flocculant reservoir connected to the first reaction tank via a second dosing pipe, and the outlet of the coagulant aid reservoir connected to the second reaction tank via a third dosing pipe, the technical effect of the dosing assembly dispensing different types of agents into the first and second reaction tanks can be achieved.

[0024] 3. By installing stirring rods in the alkali agent solution reservoir, flocculant solution reservoir, and coagulant aid solution reservoir, the uniformity of the agents is improved, ensuring the effectiveness of the agents.

[0025] 4. By installing a drug delivery pump, a drug delivery valve, and a metering valve on the first, second, and third drug delivery pipelines, and electrically connecting the metering valve to the first or second detection element, the quantitative control and drug delivery control of the drug delivery can be achieved, thereby improving the controllability and intelligence of the drug delivery components.

[0026] 5. By connecting the alkali reagent solution storage section, flocculant solution storage section, and coagulant aid solution storage section to the water supply network, the water supply for the reagent mixture in the alkali reagent solution storage section, flocculant solution storage section, and coagulant aid solution storage section is ensured.

[0027] 6. By setting both the first and second detection elements as water quality sensors, it is ensured that the water quality of the wastewater can be detected and fed back.

[0028] 7. By installing a drain pipe at the bottom of the sedimentation tank, and installing a drain pump and drain valve on the drain pipe, the discharge of sludge in the sedimentation tank can be controlled.

[0029] 8. By installing a water distributor in the sedimentation tank, the sewage in the sedimentation tank is evenly distributed into the biological packing layer between the water distributor and the sludge outlet of the sedimentation tank, which promotes the degradation of sewage by microorganisms and improves the pretreatment effect of sewage.

[0030] 9. By installing a first return pipe on the sewage pipe, with the outlet of the first return pipe extending into the first reaction tank and / or the second reaction tank, the sludge in the sedimentation tank is returned to the first reaction tank and / or the second reaction tank, thereby reducing the reagent consumption of the first reaction tank and / or the second reaction tank and reducing operating costs. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the dosing assembly of this utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the chemical dosing component of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. First reaction tank; 101. First stirring device;

[0036] 20. Second reaction tank; 201. Second stirring device;

[0037] 30. Sedimentation tank; 301. Water distributor; 302. Sludge outlet; 303. Sewage pipe; 304. Sewage valve; 305. Sewage pump; 306. Return pipe; 307. Return valve; 308. Return pump;

[0038] 40. Dosing assembly; 401. Alkali agent reservoir; 402. Flocculant reservoir; 403. Coagulant aid reservoir; 404. First drug delivery pipeline; 405. Second drug delivery pipeline; 406. Third drug delivery pipeline; 407. Drug delivery pump; 408. Stirring rod; 409. Stirring motor; 410. Drug delivery valve; 411. Metering valve;

[0039] 50. Water supply network; 60. First sedimentation well; 70. Second sedimentation well;

[0040] 80. Regulating tank; 801. Booster pump; 802. Booster pipeline. Detailed Implementation

[0041] To facilitate understanding of this utility model, the specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.

[0042] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0043] Unless otherwise specified or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0044] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0045] like Figure 1-3 As shown in the figure, the secondary coagulation and sedimentation system for municipal solid waste leachate provided in this embodiment includes:

[0046] The first reaction tank 10 is equipped with a first stirring device 101.

[0047] The second reaction tank 20 has an inlet that is connected to the outlet of the first reaction tank 10, and has a built-in second stirring device 201. The stirring speed of the second stirring device 201 may be the same as or different from that of the first stirring device 101.

[0048] The sedimentation tank 30 has its inlet connected to the outlet of the second reaction tank 20, and its outlet is connected to the subsequent treatment device.

[0049] The dosing assembly 40 has a dosing outlet that is connected to the first reaction tank 10 and the second reaction tank 20 respectively, so as to add different agents into the first reaction tank 10 and the second reaction tank 20;

[0050] The detection component includes a first detection element and a second detection element. Both the first and second detection elements are electrically connected to the dosing component 40. The first detection element is located in the first reaction tank 10 and is used to detect the water quality in the first reaction tank 10. The second detection element is located in the second reaction tank 20 and is used to detect the water quality in the second reaction tank 20.

[0051] The first reaction tank 10 and the second reaction tank 20 are connected by a pipe with valves and pumps to transfer the sewage in the first reaction tank 10 to the second reaction tank 20. Similarly, the second reaction tank 20 and the sedimentation tank 30 are also connected by a pipe with valves and pumps to transfer the sewage in the second reaction tank 20 to the sedimentation tank 30.

[0052] The first stirring device 101 and the second stirring device 201 described in this embodiment are stirring devices in the prior art. Any device that can stir the first reaction tank 10 and the second reaction tank 20 is acceptable, and it can be set to a continuous stirring mode. Compared with the traditional intermittent blower aeration, it effectively avoids the local anaerobic conditions that occur during intermittent periods, thereby minimizing the generation of odor.

[0053] It also includes a first sedimentation well 60, a second sedimentation well 70, and a regulating tank 80. The leachate from domestic waste enters the first sedimentation well 60 through a pipe. The bottom outlet of the first sedimentation well 60 is connected to the bottom inlet of the second sedimentation well 70, and the top outlet of the second sedimentation well 70 is connected to the top inlet of the regulating tank 80.

[0054] Furthermore, a lift pump 801 is provided in the regulating tank 80, and a lift pipe 802 is provided on the lift pump 801. The lift pipe 802 extends into the first reaction tank 10 or is connected to the inlet of the first reaction tank 10.

[0055] Furthermore, the first pipeline can be equipped with a sensor for detecting whether the pH value meets the standard, as well as a second return pipe 306. A control valve controlled by the sensor is installed on the second return pipe 306. If the pH value in the first pipeline is detected to be substandard, the control valve will open and return the pH value to the equalization tank 80 through the second return pipe 306 for readjustment.

[0056] In this embodiment, the first sedimentation well 60 and the second sedimentation well 70 are used to allow the received leachate from domestic waste to settle and settle. The equalization tank 80 is used to add a pH adjuster to the supernatant transported from the second sedimentation well 70 for adjustment.

[0057] The dosing assembly 40 includes an alkali agent storage section 401, a flocculant storage section 402, and a coagulant aid storage section 403. Each of the alkali agent storage section 401, flocculant storage section 402, and coagulant aid storage section 403 is equipped with a stirring rod 408, and each stirring rod 408 is connected to an external stirring motor 409. The alkali agent storage section 401, flocculant storage section 402, and coagulant aid storage section 403 are all connected to a water supply network 50. The outlet of the alkali agent storage section 401 is connected to the first reaction tank 10 through a first drug delivery pipe 404. The outlet of the flocculant storage section 402 is connected to the first reaction tank 10 through a second drug delivery pipe 405. The outlet of the coagulant aid storage section 403 is connected to the second reaction tank 20 through a third drug delivery pipe 406.

[0058] Furthermore, the first drug delivery pipeline 404, the second drug delivery pipeline 405, and the third and fourth drug delivery pipelines are each equipped with a drug delivery pump 407, a drug delivery valve 410, and a metering valve 411, wherein the metering valve 411 is electrically connected to the first or second detection element.

[0059] The dosing component 40 used in this embodiment, compared with traditional membrane processes (RO or DTRO), only requires the addition of a small amount of reagent to efficiently treat landfill leachate. This process does not produce concentrate or secondary pollution, which not only greatly reduces operating costs, but also enables the leachate to achieve full-scale compliant treatment.

[0060] Both the first and second detection components are water quality sensors. It is sufficient to use existing water quality sensors capable of detecting the water quality in the first reaction tank 10 and the second reaction tank 20; there are no restrictions on how they are configured or how they are used.

[0061] In this embodiment, the first and second detection elements can be automated and adjusted in real time using existing PLC-linked sensor technology. This supports remote monitoring and unattended operation. The system can automatically adjust the dosage of the reagent according to water quality fluctuations, achieving precise dosing, reducing reagent waste, and saving reagent costs.

[0062] The sedimentation tank 30 has a drain outlet at the bottom, which is connected to a drain pipe 303. The drain pipe 303 is equipped with a drain pump 305 and a drain valve 304 to discharge the sludge in the sedimentation tank 30 to a specific treatment device or transportation device for further processing.

[0063] Furthermore, a first return pipe 306 is provided on the sewage pipe 303, and the outlet of the first return pipe 306 extends into the first reaction tank 10 and / or the second reaction tank 20 to return sludge to the first reaction tank 10 and / or the second reaction tank 20, thereby reducing the reagent consumption of the first reaction tank 10 and / or the second reaction tank 20 and reducing operating costs.

[0064] Understandably, a return valve 307 and a return pump 308 need to be installed on the first return pipe 306 to control the opening and closing of the first return pipe 306 and the return power supply.

[0065] The sedimentation tank 30 is equipped with a water distributor 301, the sludge outlet 302 of the sedimentation tank 30 is located below the water distributor 301, and a biological packing layer is provided between the water distributor 301 and the sludge outlet 302.

[0066] In this embodiment, all electrical components can be equipped with the fault self-diagnosis function of the prior art, which reduces the difficulty of operation and maintenance, makes maintenance convenient, and reduces after-sales maintenance costs. As long as fault self-diagnosis can be achieved, there is no restriction on the technical means used.

[0067] The secondary coagulation and sedimentation system for municipal solid waste leachate provided in this embodiment, compared with the prior art, involves sequentially treating wastewater by setting up a first reaction tank 10 and a second reaction tank 20. The dosing component 40 can add different types of agents to the first reaction tank 10 and the second reaction tank 20 according to the water quality detected by the first and second detectors of the detection component. The first stirring device 101 and the second stirring device 201 are each set with independent stirring rates according to the water quality of the wastewater and the type of agent added, thereby improving the coagulation reaction effect, improving the pretreatment effect of municipal solid waste leachate, and achieving the effect of efficient and stable removal of pollutants.

[0068] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A secondary coagulation and sedimentation system for municipal solid waste leachate, characterized in that, include: The first reaction tank (10) is equipped with a first stirring device (101); The second reaction tank (20) has an inlet that is connected to the outlet of the first reaction tank (10) and has a built-in second stirring device (201). The stirring speed of the second stirring device (201) is the same as or different from that of the first stirring device (101). The sedimentation tank (30) has its inlet connected to the outlet of the second reaction tank (20), and its outlet connected to the subsequent treatment device. The dosing assembly (40) has a dosing outlet that is connected to the first reaction tank (10) and the second reaction tank (20) respectively, so as to add different agents into the first reaction tank (10) and the second reaction tank (20); The detection component includes a first detection element and a second detection element. Both the first detection element and the second detection element are electrically connected to the dosing component (40). The first detection element is located in the first reaction tank (10) and is used to detect the water quality in the first reaction tank (10). The second detection element is located in the second reaction tank (20) and is used to detect the water quality in the second reaction tank (20).

2. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 1, characterized in that, The dosing assembly (40) includes an alkaline agent reservoir (401), a flocculant reservoir (402), and a coagulant aid reservoir (403). The outlet of the alkaline agent reservoir (401) is connected to the first reaction tank (10) through a first drug delivery pipe (404). The outlet of the flocculant reservoir (402) is connected to the first reaction tank (10) through a second drug delivery pipe (405). The outlet of the coagulant aid reservoir (403) is connected to the second reaction tank (20) through a third drug delivery pipe (406).

3. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 2, characterized in that, Each of the alkaline agent storage section (401), flocculant storage section (402), and coagulant aid storage section (403) is equipped with a stirring rod (408), and each stirring rod (408) is connected to an external stirring motor (409).

4. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 3, characterized in that, The first drug delivery pipeline (404), the second drug delivery pipeline (405), and the third drug delivery pipeline (406) are each equipped with a drug delivery pump (407), a drug delivery valve (410), and a metering valve (411), wherein the metering valve (411) is electrically connected to the first detection element or the second detection element.

5. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 4, characterized in that, The alkaline agent solution and storage section (401), the flocculant solution and storage section (402), and the coagulant aid solution and storage section (403) are all connected to the water supply network (50).

6. The secondary coagulation and sedimentation system for municipal solid waste leachate according to any one of claims 1-5, characterized in that, Both the first and second detection components are water quality sensors.

7. The secondary coagulation and sedimentation system for municipal solid waste leachate according to any one of claims 1-5, characterized in that, A sewage pipe (303) is provided at the bottom of the sedimentation tank (30). A sewage pump (305) and a sewage valve (304) are provided on the sewage pipe (303). The outlet of the sewage pipe (303) is used to discharge sludge or discharge it into the sludge treatment equipment.

8. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 7, characterized in that, A water distributor (301) is provided in the sedimentation tank (30), the sludge outlet (302) of the sedimentation tank (30) is located below the water distributor (301), and a biological packing layer is provided between the water distributor (301) and the sludge outlet (302).

9. The secondary coagulation and sedimentation system for municipal solid waste leachate according to claim 8, characterized in that, A first return pipe (306) is provided on the sewage pipe (303), and the outlet of the first return pipe (306) extends into the first reaction tank (10) and / or the second reaction tank (20) to return sludge to the first reaction tank (10) and / or the second reaction tank (20).

Images