Leachate treatment system

Abstract

The utility model relates to a leachate treatment system, which relates to the technical field of leachate treatment, and adopts the technical scheme that the leachate treatment system comprises an accommodating device, a pretreatment device, a sludge dewatering device and an ozone treatment device, and can reduce the contents of heavy metals and organic matters in leachate. Meanwhile, sludge, sewage, waste gas and other impurities generated in the treatment process can be treated. In addition, the solid waste to be treated can be incinerated through the incineration device. Sludge, sewage and waste gas generated in the whole treatment process can be effectively treated and utilized, diversity and repeated utilization of resources are achieved, environmental pollution can be reduced, and the resource utilization efficiency and the environmental protection level of cement production are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of leachate treatment, in particular to a leachate treatment system. Background Art

[0002] The coordinated waste treatment of domestic waste through cement kilns has been widely used at home and abroad for many years and is also a common waste treatment method in countries around the world. Common cement kiln waste treatment systems include rotary kilns, decomposition furnaces, waste pretreatment systems and waste heat power generation systems.

[0003] Due to the high moisture content of garbage, directly feeding it into a decomposition furnace can affect the temperature and flow fields of the decomposition furnace, increase the heat consumption of the cement line, affect cement quality, and increase investment costs. Typically, garbage is pre-treated before being fed into a decomposition furnace for incineration and disposal. The heat generated is fed into a steam boiler, which then feeds the cement kiln's waste heat power generation system, allowing it to operate at full capacity. Utility Model Content

[0004] Based on this, a leachate treatment system is provided, which can treat the leachate produced by garbage fermentation, improve garbage treatment efficiency and reduce treatment costs.

[0005] The utility model proposes a leachate treatment system, which includes a containing device, a pretreatment device, a sludge dewatering device and an odor treatment device, wherein the containing device is used to contain waste to be treated, and the waste to be treated can be fermented to produce leachate; the pretreatment device is connected to the containing device, and is used to collect leachate and can remove heavy metal ions and organic matter in the leachate to generate a supplementary water source; the sludge dewatering device is connected to the pretreatment device, and is used to collect sludge generated by the pretreatment device and dewater the sludge, and the dehydrated sludge can enter the containing device; the odor treatment device is connected to the containing device, the pretreatment device and the sludge dewatering device, and is used to remove waste gas generated by the containing device, the pretreatment device and the sludge dewatering device as cooling air for the grate cooler.

[0006] In one embodiment, the leachate treatment system also includes an incineration device, which includes a garbage storage pit, an incinerator, a decomposition furnace and a slag recovery unit. The gas outlet end of the incinerator is connected to the decomposition furnace, and the material outlet end of the incinerator is connected to the slag recovery unit. The waste to be treated is transported from the garbage storage pit to the incinerator with the help of the conveying unit. The incinerator is used to incinerate the waste to be treated, causing the waste to be treated to produce flue gas and slag. The decomposition furnace is used to dispose of harmful substances in the flue gas, and the slag recovery unit is used to recover slag.

[0007] In one embodiment, the pretreatment device includes a collection tank connected to the outlet of the containing device, a primary sedimentation tank connected to the collection tank, and an oxidation tank connected to the primary sedimentation tank. The collection tank is used to collect leachate, and the leachate in the collection tank is transported to the primary sedimentation tank by a water pump. Raw material powder is added to the primary sedimentation tank to remove metal ions in the leachate. The oxidation tank is used to collect leachate output from the primary sedimentation tank. Ozone is added to the oxidation tank to remove organic matter in the leachate. The leachate flowing out of the oxidation tank is transported to the slag recovery unit by a second water pump as a supplementary water source.

[0008] In one embodiment, the sludge dewatering device includes a sludge tank connected to the outlet of the primary sedimentation tank and a dewatering machine connected to the outlet of the sludge tank. The sludge sediment in the primary sedimentation tank is transported to the sludge tank for flocculation by means of a sludge discharge pump, and the sludge sediment in the sludge tank is transported to the dewatering machine for dewatering by means of a feed pump. The dewatered sludge sediment enters a garbage storage pit by means of a dry sludge pump, and the sewage discharged from the dewatering machine is transported to an oxidation tank for oxidation by means of a third water pump.

[0009] In one embodiment, the odor treatment device includes an odor treatment device and a grate cooler. The garbage storage pit, primary sedimentation tank, oxidation tank, sludge tank and dehydrator are all connected to the odor treatment device through an odor pipe. With the help of a first fan, the waste gas generated by the garbage storage pit, primary sedimentation tank, oxidation tank, sludge tank and dehydrator can be transported to the odor treatment device. With the help of a second fan, the gas in the odor treatment device is transported to the grate cooler as cooling air for the grate cooler.

[0010] In one embodiment, the slag recovery unit includes a slag well, a slag discharger, a vibrating conveyor, a belt conveyor and an iron remover connected in sequence, and the waste to be processed can fall into the slag well, the slag discharger, the vibrating conveyor, the belt conveyor and the iron remover in sequence from the outlet of the incinerator.

[0011] In one embodiment, the conveying unit includes a crane and a grab bucket, both of which are arranged above the garbage storage pit, and the grab bucket is used to grab the waste to be processed in the garbage storage pit and bring it to the incinerator.

[0012] In one embodiment, agitators are provided in the oxidation tank, the primary sedimentation tank and the sludge tank.

[0013] The technical effects achieved by the utility model are:

[0014] It can reduce the content of heavy metals and organic matter in the leachate, and at the same time, it can treat impurities such as sludge, sewage, and exhaust gas generated during the treatment process. In addition, the solid waste to be treated can be incinerated by an incineration device. At the same time, the incineration device can treat the flue gas and slag generated by the incineration, so that the harmful gases in the flue gas after incineration are reduced. The treated flue gas can be used as energy for the waste heat boiler, and the slag can be recycled and reused. The treated slag can be used as raw material in the cement raw material mill. The sludge, sewage, and exhaust gas generated during the entire treatment process can be effectively treated and utilized, realizing the diversity and reusability of resources, reducing environmental pollution, and further improving the resource utilization efficiency and environmental protection level of cement production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of a leachate treatment system in one embodiment.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the incineration device.

[0017] In the figure: 100, leachate treatment system; 10, receiving device; 11, waste to be treated; 20, incineration device; 21, incinerator; 22, decomposition furnace; 23, slag recovery unit; 231, slag pit; 232, slag discharger; 233, vibrating conveyor; 234, belt conveyor; 235, iron remover; 24, conveying unit; 241, crane; 242, grab bucket; 30, pretreatment device; 31, collection tank; 311, first water pump; 3 2. Primary sedimentation tank; 321. Agitator; 33. Oxidation tank; 331. Second water pump; 34. Raw material silo; 40. Sludge dewatering device; 41. Sludge tank; 411. Sludge pump; 42. Dewatering machine; 421. Feed pump; 422. Dry sludge pump; 423. Third water pump; 50. Odor treatment device; 51. Odor treatment device; 511. First fan; 512. Second fan; 52. Grate cooler; 60. Waste heat boiler; 70. Cement raw material mill. DETAILED DESCRIPTION

[0018] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0024] See Figure 1 , Figure 1 A schematic diagram of the structure of an embodiment of the present invention is shown. An embodiment of the present invention provides a leachate treatment system. The leachate treatment system 100 includes a storage device 10, an incineration device 20, a pretreatment device 30, a sludge dewatering device 40, and an odor treatment device 50. The storage device 10 is used to store waste material 11 to be treated. The waste material 11 to be treated can ferment and produce leachate. The leachate is sequentially treated by the pretreatment device 30, the sludge dewatering device 40, and the odor treatment device 50. This can reduce the heavy metal and organic content of the leachate and treat impurities such as sludge, sewage, and exhaust gas generated during the treatment process. In addition, the solid waste material 11 to be treated can be incinerated by the incineration device 20. The incineration device 20 can also treat the flue gas and slag generated by the incineration, thereby reducing harmful gases in the flue gas after incineration. The treated flue gas can be used as energy for the waste heat boiler 60, and the slag can be recycled and reused. The treated slag can be used as raw material in the cement raw material mill 70. The sludge, sewage and waste gas generated during the entire treatment process can be effectively treated and utilized, realizing the diversity and repeatability of resources, reducing environmental pollution, and further improving the resource utilization efficiency and environmental protection level of cement production.

[0025] The above-mentioned waste material 11 to be treated can be domestic waste, industrial waste, or a mixture of industrial waste, agricultural residues, and industrial and agricultural waste such as domestic waste. The specific form is a solid-liquid mixture. The above-mentioned waste material 11 to be treated can be fermented in the containing device 10. The containing device 10 includes a garbage incinerator. The upper end of the garbage incinerator is closed. The waste material 11 to be treated can ferment in the garbage incinerator and produce leachate.

[0026] Specifically, the incineration device 20 includes an incinerator 21, a decomposition furnace 22 and a slag recovery unit 23. The gas outlet end of the incinerator 21 is connected to the decomposition furnace 22, and the material outlet end of the incinerator 21 is connected to the slag recovery unit 23. The waste to be treated 11 is transported from the garbage storage pit to the incinerator 21 by means of the conveying unit 24. The incinerator 21 is used to incinerate the waste to be treated 11. After incineration, the waste to be treated 11 produces flue gas and slag. At this time, the temperature of the flue gas reaches 850℃~950℃. The flue gas enters the decomposition furnace 22 from the top of the incinerator 21 through the flue gas pipe to provide heat for the decomposition of cement raw materials, and uses the high temperature and alkaline environment in the decomposition furnace to treat harmful substances in the flue gas. The harmful substances mainly refer to organic matter such as dioxins and acidic gases such as SO2. At the same time, the slag enters the slag recovery unit 23 through the slag pipe from the discharge outlet of the incinerator 21. The slag recovery unit 23 includes a slag well 231, a slag discharger 232, a vibrating conveyor 233, a belt conveyor 234 and an iron remover 235 connected in sequence. The slag well 231 is set at the discharge outlet of the incinerator 21. The slag well 231 ensures that the slag is discharged smoothly from the discharge outlet of the incinerator 21. The slag discharger 232 is used to cool the high-temperature slag discharged from the incinerator. The vibrating conveyor 233 includes a screen and a vibration motor for driving the screen to move. The slag falls onto the screen, and the vibration motor causes the screen to vibrate, which can remove impurity particles in the slag. The slag is then transported to the iron remover 235 via the belt conveyor 234. The iron remover 235 can absorb iron filings in the slag. The final slag can be transported to the cement raw material mill 70 and used as a raw material for producing cement, realizing the diversity and repeatability of resources and reducing environmental pollution.

[0027] In this embodiment, the conveying unit 24 includes a crane 241 and a grab bucket 242. Both the crane 241 and the grab bucket 242 are arranged above the garbage storage pit. The grab bucket 242 is used to grab the waste material 11 to be processed from the garbage storage pit and transport it to the incinerator 21. Specifically, the crane 241 may include a crane frame arranged along a first direction and a second direction perpendicular to the first direction. A moving block is slidably provided on the crane frame. The moving block can slide in the first direction or the second direction. The grab bucket 242 is connected to the moving block. The grab bucket 242 can be a retractable robotic arm that can move forward, backward, left, and right to grab the waste material 11 to be processed to meet working requirements.

[0028] The pretreatment device 30 includes a collection tank 31, a primary sedimentation tank 32 connected to the collection tank 31, and an oxidation tank 33 connected to the primary sedimentation tank 32. The collection tank 31 is arranged below the garbage incineration pit and connected to the drainage port of the garbage incineration pit. The leachate flowing out of the garbage incineration pit can flow into the collection tank 31. A first water pump 311 is arranged in the collection tank 31. The leachate in the collection tank 31 is transported to the primary sedimentation tank 32 by means of the first water pump 311. The primary sedimentation tank 32 is connected to the raw material silo 34. A certain amount of raw material powder is stored in the raw material silo 34. The raw material powder is the raw material for cement production and is a mixture of limestone and clay. Adding raw material powder to the primary sedimentation tank 32 can remove metal ions in the leachate. At this time, there is cement precipitate in the primary sedimentation tank 32, and the leachate after precipitation in the primary sedimentation tank 32 can flow into the oxidation tank 33. Ozone is added to the oxidation tank 33 to remove organic matter in the leachate. The oxidation tank 33 and the slag discharger 232 are connected by a water pipeline. A second water pump 331 is provided on the water pipeline. With the help of the second water pump 331, the leachate flowing out of the oxidation tank 33 is transported to the slag discharger 232 as a supplementary water source. Through the joint action of the primary sedimentation tank 32 and the oxidation tank 33, the harmful substances in the leachate are effectively reduced.

[0029] The sludge dewatering device 40 includes a sludge tank 41 and a dewatering machine 42. The sludge tank 41 is connected to the primary sedimentation tank 32 through a sludge discharge pipe, and a sludge pump 411 is provided on the sludge discharge pipe. The dewatering machine 42 is connected to the sludge tank 41 through a dewatering pipe, and a feed pump 421 is provided on the dewatering pipe. The sludge sediment in the primary sedimentation tank 32 is transported to the sludge tank 41 through the sludge discharge pump 411, and flocculation treatment is carried out in the sludge tank 41. Subsequently, the feed pump 421 transports the sludge sediment to the dewatering machine 42 for dewatering treatment. The treated sludge sediment is transported to the garbage storage pit through the dry sludge pump 422. The dewatered sludge sediment can be transported to the incineration device 20 for treatment. The dewatering machine 42 and the oxidation tank 33 are connected through a sewage pipe, and a third water pump 423 is provided in the sewage pipe. The sewage discharged from the dewatering machine 42 is transported to the oxidation tank 33 for oxidation through the third water pump 423. No pollutants are discharged into the environment during the entire process. The sewage and sludge generated by the treated leachate can be returned to the leachate treatment system 100 for further treatment, thereby improving the leachate treatment effect and resource utilization efficiency, reducing emission pollution, and improving resource utilization.

[0030] In this embodiment, the oxidation tank 33, the primary sedimentation tank 32 and the sludge tank 41 are all provided with a stirrer 321. The stirrer 321 can evenly distribute the leachate, sludge and other substances, promote the chemical reaction, and thus achieve a highly efficient leachate treatment effect.

[0031] The odor treatment device 50 includes an odor treatment unit 51 and a grate cooler 52. The garbage storage pit, primary sedimentation tank 32, oxidation tank 33, sludge tank 41, and dehydrator 42 are all connected to the odor treatment unit 51 via an odor pipe. A first fan 511 is installed on the odor pipe. This fan 511 transports odor generated by the garbage storage pit, primary sedimentation tank 32, oxidation tank 33, sludge tank 41, and dehydrator 42 to the odor treatment unit 51. In the odor treatment unit 51, harmful components in the waste gas generated by the garbage storage pit, primary sedimentation tank 32, oxidation tank 33, sludge tank 41, and dehydrator 42 are oxidized and decomposed. Harmful components such as sulfur compounds, nitrogen compounds, chlorine compounds, halogens and their derivatives, and hydrocarbons are oxidized and decomposed. The gas treated by the odor treatment unit 51 is then transported to the grate cooler 52 via a second fan 512 for cooling.

[0032] It should be noted that the order of the above steps only represents one implementation method of this embodiment. In some other embodiments, in order to adapt to differences in systems or structures, it is also conceivable to adjust some implementation orders of the above methods.

[0033] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the utility model patent shall be determined by the appended claims.

Claims

1. A leachate treatment system, characterized in that: The leachate treatment system comprises: A receiving device for receiving waste to be treated, wherein the waste to be treated can be fermented and produce leachate; a pretreatment device, connected to the containing device, for collecting the leachate and capable of removing heavy metal ions and organic matter in the leachate to generate a supplementary water source; a sludge dewatering device, connected to the pretreatment device, for collecting the sludge generated by the pretreatment device and dewatering the sludge, so that the dewatered sludge can enter the containing device; and The odor treatment device is connected to the accommodating device, the pretreatment device and the sludge dewatering device, and is used to remove harmful components in the waste gas generated by the accommodating device, the pretreatment device and the sludge dewatering device, and serve as cooling air for the grate cooler.

2. The leachate treatment system according to claim 1, characterized in that: The leachate treatment system also includes an incineration device, which includes a garbage storage pit, an incinerator, a decomposition furnace and a slag recovery unit. The gas outlet end of the incinerator is connected to the decomposition furnace, and the material discharge end of the incinerator is connected to the slag recovery unit. The waste to be treated is transported from the garbage storage pit to the incinerator with the help of a conveying unit. The incinerator is used to incinerate the waste to be treated, causing the waste to be treated to produce flue gas and slag. The decomposition furnace is used to dispose of harmful components in the flue gas, and the slag recovery unit is used to recover the slag.

3. The leachate treatment system according to claim 2, characterized in that: The pretreatment device includes a collection tank connected to the outlet of the containing device, a primary sedimentation tank connected to the collection tank, and an oxidation tank connected to the primary sedimentation tank. The collection tank is used to collect the leachate, and the leachate in the collection tank is transported to the primary sedimentation tank by a first water pump. Raw material powder is added to the primary sedimentation tank to remove metal ions in the leachate. The oxidation tank is used to collect the leachate output from the primary sedimentation tank. Ozone is added to the oxidation tank to remove organic matter in the leachate. The leachate flowing out of the oxidation tank is transported to the slag recovery unit by a second water pump as a supplementary water source.

4. The leachate treatment system according to claim 3, characterized in that: The sludge dewatering device includes a sludge tank connected to the outlet of the primary sedimentation tank and a dewatering machine connected to the outlet of the sludge tank. The sludge sediment in the primary sedimentation tank is transported to the sludge tank for flocculation with the help of a sludge discharge pump, and the sludge sediment in the sludge tank is transported to the dewatering machine for dewatering with the help of a feed pump. The dewatered sludge sediment enters the garbage storage pit with the help of a dry sludge pump, and the sewage discharged from the dewatering machine is transported to the oxidation tank for oxidation with the help of a third water pump.

5. The leachate treatment system according to claim 4, characterized in that: The odor treatment device includes an odor treatment device and a grate cooler. The garbage storage pit, the primary sedimentation tank, the oxidation tank, the sludge tank and the dehydrator are all connected to the odor treatment device through an odor pipe. With the help of a first fan, the waste gas generated by the garbage storage pit, the primary sedimentation tank, the oxidation tank, the sludge tank and the dehydrator can be transported to the odor treatment device. With the help of a second fan, the gas in the odor treatment device is transported to the grate cooler as cooling air for the grate cooler.

6. The leachate treatment system according to claim 2, characterized in that: The slag recovery unit includes a slag pit, a slag discharger, a vibrating conveyor, a belt conveyor and an iron remover connected in sequence. The waste to be processed can fall into the slag pit, the slag discharger, the vibrating conveyor, the belt conveyor and the iron remover in sequence from the outlet of the incinerator.

7. The leachate treatment system according to claim 2, characterized in that: The conveying unit includes a crane and a grab bucket, both of which are arranged above the garbage storage pit. The grab bucket is used to grab the waste to be processed in the garbage storage pit and bring it to the incinerator.

8. The leachate treatment system according to claim 5, characterized in that: Agitators are provided in the oxidation tank, the primary sedimentation tank and the sludge tank.

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