Landfill leachate treatment device

Abstract

The utility model discloses a landfill leachate treatment device, and relates to the technical field of sewage treatment devices. The sedimentation tank is divided into a buffer zone, a stirring zone, a sedimentation zone and a clear water zone through partition plates, and through holes are formed in the bottoms of the partition plates. And the stirring device is arranged in the stirring area. The first overflow pipe is arranged between the stirring area and the settling area, and the second overflow pipe is arranged between the settling area and the clear water area. And an inclined tube precipitation assembly is arranged in the precipitation area. The flushing device is installed on the inclined pipe and used for flushing the precipitation wall of the inclined pipe, and the sludge accumulation problem is solved. The sedimentation tanks can be arranged in parallel, so that the treatment efficiency is improved, and one-standby and one-use functions are realized. The submersible pump is matched with the three-way valve, so that water can be pumped for flushing and sludge cleaning during flushing. The bottom of the settling zone is of a conical structure and is provided with a spiral feeder. According to the utility model, efficient precipitation operation can be realized, the treatment efficiency of the landfill leachate is improved, and the continuity of the treatment process is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment devices, and in particular to a landfill leachate treatment device. Background Technology

[0002] Landfill leachate is a high-concentration organic wastewater produced during the storage and landfilling process of landfill waste due to the combined effects of the waste's moisture content, leaching from precipitation, and microbial metabolism. Its composition is complex, containing various organic compounds, heavy metal ions, ammonia nitrogen, pathogens, and other harmful substances. If discharged directly without effective treatment, it will cause serious pollution to surrounding water bodies, soil, and the ecological environment, threatening ecological balance and human health.

[0003] Traditional methods for treating landfill leachate mainly include biological treatment, physicochemical treatment, and membrane treatment. Biological treatment utilizes the metabolic activity of microorganisms to decompose organic matter in the leachate; however, this method is sensitive to changes in leachate quality and quantity, and is ineffective for treating high concentrations of ammonia nitrogen and some recalcitrant organic matter. Physicochemical treatment methods, such as coagulation sedimentation and activated carbon adsorption, can effectively remove some pollutants from the leachate, but often suffer from high treatment costs, secondary pollution, and unstable treatment results.

[0004] In practical landfill leachate treatment projects, a combination of multiple methods is typically employed to overcome the limitations of a single treatment approach. However, even so, existing treatment technologies still face challenges, such as the need to improve treatment efficiency, high operating costs, and complex equipment maintenance. Particularly in the sedimentation stage, traditional sedimentation tank structures and methods often fail to achieve efficient separation of sludge and clarified water, increasing the burden on subsequent treatment processes and affecting the stable operation and overall treatment effectiveness of the entire system.

[0005] Therefore, developing a device that can treat landfill leachate more efficiently and stably, optimizing the sedimentation process, and improving the separation efficiency of sludge and clarified water are of great practical significance for improving the overall treatment level of landfill leachate. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model discloses a landfill leachate treatment device.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A landfill leachate treatment device, comprising:

[0009] The sedimentation tank is divided into a buffer zone, a stirring zone, a sedimentation zone, and a clear water zone by partitions; and the bottom of the partition between the buffer zone and the stirring zone is provided with through holes.

[0010] A mixing device is installed within the mixing zone;

[0011] The first overflow pipe is installed between the mixing zone and the sedimentation zone. The inlet of the first overflow pipe is located at the top of the mixing zone, and the outlet is located at the bottom of the sedimentation zone.

[0012] An inclined tube sedimentation assembly, located within a sedimentation zone, comprises multiple inclined tubes arranged in an array.

[0013] A rinsing device, comprising multiple rinsing devices, is installed on multiple inclined tubes respectively, for rinsing the sedimentation walls of the inclined tubes;

[0014] The second overflow pipe is installed between the sedimentation zone and the clear water zone, with its inlet located at the top of the sedimentation zone.

[0015] Preferably, there are two sedimentation tanks, which are connected in parallel.

[0016] Preferably, a submersible pump is installed in the clear water zone of the sedimentation tank, and the outlet of the submersible pump in one sedimentation tank is connected to the flushing device of the sedimentation tank and the buffer zone of the other sedimentation tank respectively through a first three-way valve; the inlet of the submersible pump is connected to the clear water zone and the sedimentation zone of the sedimentation tank respectively through a second three-way valve.

[0017] Preferably, the rinsing device includes a rinsing pipe installed inside the inclined tube, and the rinsing pipe body is provided with a plurality of rinsing nozzles facing the sedimentation wall of the inclined tube at intervals.

[0018] Preferably, the bottom of the sedimentation zone has a conical structure, and a screw feeder is installed at the bottom of the zone.

[0019] Preferably, the stirring device includes a drive motor installed at the top of the stirring zone of the sedimentation tank, and a stirring shaft extending into the stirring zone is installed at the output end of the drive motor. The stirring shaft is provided with multiple stirring blades at intervals, and the inclination directions of two adjacent stirring blades are opposite.

[0020] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0021] (1) The sedimentation tank of this utility model is divided into a buffer zone, a stirring zone, a sedimentation zone, and a clear water zone by a partition, and is equipped with through holes and an overflow pipe, so that the leachate with added flocculant can flow stably in sequence, achieving efficient sedimentation and effectively improving the treatment efficiency of leachate. The stirring device in the stirring zone can fully stir the liquid, avoid sludge sedimentation, and its effect can extend to the buffer zone, further ensuring the treatment effect. The inclined tube sedimentation component equipped in the sedimentation zone, through the special design of the inclined tube, allows the sludge to sink along the inclined tube sedimentation wall and the clarified water to flow upward, improving the sedimentation accuracy and efficiency. At the same time, the setting of the flushing device solves the problem of sludge accumulation on the inclined tube sedimentation wall causing a decrease in sedimentation performance. Water is supplied by a water pump and sprayed through the flushing nozzle, which can powerfully flush the inclined tube sedimentation wall. The flushing pipes are connected in parallel in groups and independently controlled by valves, making the flushing operation more flexible and efficient. The flushing pipes can be fully or partially opened according to the flushing pressure conditions to ensure the flushing quality.

[0022] (2) The two sedimentation tanks in parallel in this utility model can not only operate simultaneously to improve the treatment efficiency, but also have a backup function to prevent the treatment work from being interrupted due to the failure of a single sedimentation tank. The cooperation of the submersible pump and the three-way valve can pump the clear water of the sedimentation area of ​​the sedimentation tank to be rinsed into the buffer area of ​​another sedimentation tank during rinsing. Subsequently, the clear water of the clear water area is used to rinse the inclined tube sedimentation component through the reversing operation, and the sludge in the sedimentation area can be cleaned at the same time. Furthermore, the combination of the conical structure at the bottom of the sedimentation area and the screw feeder further enhances the sedimentation effect and facilitates the discharge of sludge, ensuring the continuity of landfill leachate treatment.

[0023] (3) The drive motor of the stirring device of this utility model drives the stirring shaft and the stirring blades with opposite tilting directions to rotate, causing the leachate to form an up-and-down flowing state, which fully ensures the stirring effect, strongly supports the subsequent sedimentation treatment process, and thus improves the overall performance and efficiency of the device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a top view of the sedimentation tank;

[0026] Figure 3 This is a schematic diagram of the rinsing device;

[0027] Figure 4 This is a schematic diagram of the stirring device.

[0028] In the diagram: 1. Sedimentation tank; 1-1. Buffer zone; 1-2. Stirring zone; 1-3. Sedimentation zone; 1-4. Clear water zone; 2. Stirring device; 2-1. Drive motor; 2-2. Stirring shaft; 2-3. Stirring blades; 3. First overflow pipe; 4. Inclined tube sedimentation assembly; 5. Flushing device; 5-1. Flushing pipe; 5-2. Flushing nozzle; 6. Second overflow pipe; 7. Screw feeder. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] Example 1:

[0033] Combined with appendix Figures 1-3 A landfill leachate treatment device includes a sedimentation tank 1, a stirring device 2, an inclined tube sedimentation assembly 4, and a flushing device 5. The sedimentation tank 1 is internally divided into a buffer zone 1-1, a stirring zone 1-2, a sedimentation zone 1-3, and a clear water zone 1-4 by a partition. A through-hole is intentionally provided at the bottom of the partition between the buffer zone 1-1 and the stirring zone 1-2 to allow liquid flow. A first overflow pipe 3 is installed between the stirring zone 1-2 and the sedimentation zone 1-3. The inlet of the first overflow pipe 3 is located at the top of the stirring zone 1-2, while the outlet is located at the bottom of the sedimentation zone 1-3. Similarly, a second overflow pipe 6 is installed between the sedimentation zone 1-3 and the clear water zone 1-4, with its inlet located at the top of the sedimentation zone 1-3.

[0034] During operation, landfill leachate with added flocculant is injected from the top of buffer zone 1-1 through a pipe. Due to gravity and the perforated design, it flows sequentially from buffer zone 1-1 into mixing zone 1-2, and then from the top of mixing zone 1-2 into sedimentation zone 1-3 via the first overflow pipe 3. In sedimentation zone 1-3, sludge settles naturally due to gravity, while clarified water flows from the top of sedimentation zone 1-3 into clear water zone 1-4 via the second overflow pipe 6, thus efficiently completing the sedimentation process. This significantly improves the overall treatment efficiency of landfill leachate.

[0035] To further optimize the treatment effect, a stirring device 2 is installed inside the stirring zone 1-2. This stirring device 2 can continuously and thoroughly stir the leachate within the stirring zone 1-2, effectively preventing sludge sedimentation. It is worth mentioning that, due to the large size of the through-hole between the buffer zone 1-1 and the stirring zone 1-2, when the stirring device 2 is activated, its stirring action can also affect the buffer zone 1-1, thus providing a certain stirring effect on the liquid within the buffer zone 1-1.

[0036] The sedimentation zone 1-3 is equipped with an inclined tube sedimentation assembly 4, which contains multiple inclined tubes arranged in an array. The landfill leachate mixed with flocculant flows upward from the bottom of the sedimentation zone 1-3. As it flows through the inclined tubes, the sludge gradually sinks along the sedimentation wall of the inclined tubes and eventually settles at the bottom of the sedimentation zone 1-3, while the clarified water continues to flow upward and flows smoothly into the clear water zone 1-4 through the second overflow pipe 6.

[0037] However, during long-term operation, sludge will gradually accumulate on the inclined tube sedimentation wall of the inclined tube sedimentation assembly 4, which will directly lead to a reduction in sedimentation performance and efficiency. To solve this problem, a flushing device 5 is installed inside each inclined tube of the inclined tube sedimentation assembly 4.

[0038] Specifically, the rinsing device 5 consists of a rinsing pipe 5-1 installed inside the inclined tube. Multiple rinsing nozzles 5-2 are spaced apart along the pipe body of the rinsing pipe 5-1, and these nozzles 5-2 are oriented towards the sedimentation wall of the inclined tube, as shown in the attached diagram. Figure 3 As shown.

[0039] When rinsing is required, water is supplied to the rinsing pipe 5-1 via a water pump, and the water flow is sprayed from the rinsing nozzle 5-2, powerfully rinsing the sedimentation wall of the inclined tube. Furthermore, multiple rinsing pipes 5-1 can be connected in parallel in groups, with each group independently controlled by valves. Under sufficient rinsing pressure, all rinsing pipes 5-1 can be opened simultaneously to significantly improve rinsing efficiency. Conversely, if the rinsing pressure is insufficient to support simultaneous operation of all rinsing pipes 5-1, only some rinsing pipes 5-1 can be opened by controlling the valves, thus ensuring that the rinsing effect is not affected.

[0040] Example 2:

[0041] This is an extension based on Example 1, combined with Appendix Figure 1 and attached Figure 2 As shown, the landfill leachate treatment device uses two sedimentation tanks 1, which are connected in parallel. This design has obvious advantages. On the one hand, both sedimentation tanks 1 can be put into use simultaneously, thereby significantly improving the treatment efficiency of landfill leachate. On the other hand, it also provides a backup function, effectively preventing the interruption of landfill leachate treatment due to an unexpected failure of one of the sedimentation tanks 1.

[0042] A further optimized structure involves installing submersible pumps inside the clear water zones 1-4 of both sedimentation tanks 1. The outlet of the submersible pump in one sedimentation tank 1 is connected to the flushing device 5 of that sedimentation tank 1 and the buffer zone 1-1 of the other sedimentation tank 1 via a first three-way valve. Simultaneously, the inlet of the submersible pump is connected to the clear water zone 1-4 and the sedimentation zone 1-3 of that sedimentation tank 1 via a second three-way valve.

[0043] When flushing the inclined tube sedimentation assembly 4 in one of the sedimentation tanks 1 is required, the operation procedure is as follows: First, turn on the submersible pump in sedimentation tank 1, connecting its inlet to sedimentation zone 1-3 of sedimentation tank 1 through the second three-way valve, and its outlet to buffer zone 1-1 of the other sedimentation tank 1 through the first three-way valve. This allows the clean water stored in sedimentation zone 1-3 of the inclined tube sedimentation assembly 4 to be flushed to be pumped into buffer zone 1-1 of the other sedimentation tank 1. After the clean water has been pumped out, reverse the first and second three-way valves, connecting the outlet of the submersible pump to the flushing device 5 installed on the inclined tube sedimentation assembly 4 through the first three-way valve, and simultaneously connecting the inlet of the submersible pump to the clean water zone 1-4 through the second three-way valve. At this point, flushing of the corresponding inclined tube sedimentation assembly 4 can be carried out. Furthermore, during this process, the sludge deposited in sedimentation zone 1-3 of the inclined tube sedimentation assembly 4 can also be cleaned simultaneously.

[0044] Furthermore, the bottom of sedimentation zones 1-3 is designed with a conical structure, and a screw feeder 7 is installed at its bottom, as shown in the attached diagram. Figure 1 As shown. While rinsing the inclined tube sedimentation assembly 4, the screw feeder 7 is started, which can smoothly discharge the sludge deposited in the sedimentation zones 1-3, thereby greatly enhancing the sedimentation effect.

[0045] It is important to note that while one sedimentation tank 1 is being flushed and cleaned, the other sedimentation tank 1 can continue to operate normally. This ensures the continuity of the landfill leachate treatment process and prevents any interruption.

[0046] Example 3:

[0047] Based on Embodiment 1 or 2, a more detailed structural description of the stirring device 2 is provided. (See attached...) Figure 4 As shown, the stirring device 2 specifically includes a drive motor 2-1 installed at the top of the stirring zone 1-2 of the sedimentation tank 1. The output end of the drive motor 2-1 is connected to a stirring shaft 2-2 extending into the stirring zone 1-2. Multiple stirring blades 2-3 are spaced apart on the shaft of the stirring shaft 2-2, with adjacent stirring blades 2-3 tilting in opposite directions. During operation, the drive motor 2-1 drives the stirring shaft 2-2 to rotate, which in turn drives the stirring blades 2-3 to rotate synchronously, thereby stirring the leachate in the stirring zone 1-2. Because adjacent stirring blades 2-3 tilt in opposite directions, the leachate is turbulent during the stirring process, ensuring effective stirring. This provides crucial support for the subsequent sedimentation treatment stage and helps to further improve the performance and efficiency of the entire leachate treatment device.

[0048] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A landfill leachate treatment device, characterized in that, include: The sedimentation tank (1) is divided into a buffer zone (1-1), a stirring zone (1-2), a sedimentation zone (1-3) and a clear water zone (1-4) by a partition; and the bottom of the partition between the buffer zone (1-1) and the stirring zone (1-2) is provided with a through hole; A stirring device (2) is installed in the stirring zone (1-2); The first overflow pipe (3) is installed between the stirring zone (1-2) and the sedimentation zone (1-3). The inlet of the first overflow pipe (3) is located at the top of the stirring zone (1-2), and the outlet is located at the bottom of the sedimentation zone (1-3). Inclined tube sedimentation assembly (4) is located in sedimentation zone (1-3) and includes multiple inclined tubes arranged in an array; A rinsing device (5) is provided, wherein there are multiple rinsing devices (5), which are respectively installed on multiple inclined tubes for rinsing the sedimentation walls of the inclined tubes. The second overflow pipe (6) is installed between the sedimentation zone (1-3) and the clear water zone (1-4), with the inlet of the second overflow pipe (6) located at the top of the sedimentation zone (1-3).

2. The landfill leachate treatment device as described in claim 1, characterized in that: There are two sedimentation tanks (1), which are connected in parallel.

3. The landfill leachate treatment device as described in claim 2, characterized in that: Submersible pumps are installed in the clear water zone (1-4) of the sedimentation tank (1). The outlet of the submersible pump in one sedimentation tank (1) is connected to the flushing device (5) of the sedimentation tank (1) and the buffer zone (1-1) of the other sedimentation tank (1) through a first three-way valve. The inlet of the submersible pump is connected to the clear water zone (1-4) and the sedimentation zone (1-3) of the sedimentation tank (1) through a second three-way valve.

4. The landfill leachate treatment device as described in claim 1, characterized in that: The flushing device (5) includes a flushing pipe (5-1) installed inside the inclined tube, and the flushing pipe (5-1) is provided with a plurality of flushing nozzles (5-2) spaced apart toward the sedimentation wall of the inclined tube.

5. The landfill leachate treatment device as described in claim 1, characterized in that: The bottom of the sedimentation zone (1-3) has a conical structure, and a screw feeder (7) is installed at the bottom.

6. The landfill leachate treatment device as described in claim 1, characterized in that: The stirring device (2) includes a drive motor (2-1) installed on the top of the stirring zone (1-2) of the sedimentation tank (1). The output end of the drive motor (2-1) is equipped with a stirring shaft (2-2) that extends into the stirring zone (1-2). The stirring shaft (2-2) is provided with multiple stirring blades (2-3) spaced apart, and the inclination directions of two adjacent stirring blades (2-3) are opposite.

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