Pretreatment device for wet landfill leachate

Abstract

The utility model belongs to the technical field of high-concentration organic wastewater treatment, and particularly relates to a wet garbage leachate pretreatment device which comprises an oil separation regulating tank, an oil scraper, an air stirring system and a heating system are arranged in the oil separation regulating tank, the oil scraper is used for scraping oil slick in the oil separation regulating tank, and the air stirring system is used for stirring the oil slick in the oil separation regulating tank. The heating system is used for adjusting the temperature in the oil separation adjusting tank, the oil separation adjusting tank is communicated with a reaction tank, the reaction tank is used for treating leachate by adding chemical agents, a first stirrer and a dosing system are arranged in the reaction tank, the reaction tank is communicated with a centrifugal dehydrator, and the centrifugal dehydrator is connected with a collecting part; the collecting part is used for respectively treating objects produced by the centrifugal dehydrator; according to the utility model, grease, nitrogen and phosphorus in the leachate can be recovered, and resource utilization is realized.

Description

Technical Field

[0001] This utility model belongs to the field of high-concentration organic wastewater treatment technology, specifically relating to a device for pretreatment of wet waste leachate. Background Technology

[0002] Leachate from wet waste refers to a high-concentration wastewater with high levels of organic matter and ammonia nitrogen generated during the landfilling and disposal of waste. This liquid contains a variety of pollutants, and if discharged directly or in a substandard manner, it will cause serious pollution to water resources and soil, thereby affecting the entire ecological environment. The leachate has a complex water quality, containing aerobic organic pollutants, various metals and plant nutrients, and may also contain toxic and harmful organic pollutants. With the improvement of people's living standards, the amount of wet waste generated is increasing day by day. High-concentration leachate is generated during the pressing process at waste transfer stations. It is discharged intermittently, with a small water volume, high concentrations of oil and nitrogen and phosphorus, and is difficult to treat.

[0003] Current research and applications in landfill leachate treatment mainly focus on chemical coagulation, coagulation flotation, and biochemical treatment. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a device for pretreatment of wet landfill leachate, so as to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A pretreatment device for leachate from wet waste includes an oil-water separation and conditioning tank. The oil-water separation and conditioning tank is equipped with an oil skimmer, an air mixing system, and a heating system. The oil skimmer is used to skim off floating oil in the oil-water separation and conditioning tank. The heating system is used to regulate the temperature in the oil-water separation and conditioning tank. The oil-water separation and conditioning tank is connected to a reaction tank, which is used to treat the leachate by adding chemical agents. The reaction tank is equipped with a first mixer and a chemical dosing system. The reaction tank is connected to a centrifugal dewatering machine, which is connected to a collection unit for separately processing the products produced by the centrifugal dewatering machine.

[0007] Furthermore, the centrifugal dewatering machine is a three-phase centrifugal dewatering machine used to simultaneously separate oil, water, and sludge.

[0008] Further specifying, the collection section includes a waste oil collection tank and a nitrogen and phosphorus collection tank. The oil separated by the centrifugal dewatering machine enters the waste oil collection tank, and the sludge separated by the centrifugal dewatering machine enters the nitrogen and phosphorus collection tank.

[0009] Further specifying, the wastewater separated from the centrifugal dewatering machine enters a sedimentation tank, which is equipped with a second agitator, a second pH meter, and a second dosing system.

[0010] Furthermore, the oil skimmer operates automatically, starting at regular intervals, and the intervals and running times can be adjusted independently.

[0011] Further specifying, the heating system uses steam heating and includes a steam switch valve connected to a temperature sensor, which is used to control the temperature between 55 and 60°C.

[0012] Furthermore, the air stirring system is in a normally open state and is used for stirring wastewater.

[0013] Further specifying, the oil-water separating regulating tank and the reaction tank are respectively equipped with a first level gauge and a second level gauge.

[0014] Further specifying, a booster pump is connected between the oil-water separation and regulating tank and the reaction tank, and a screw pump and a flow meter are sequentially connected between the reaction tank and the centrifugal dewatering machine.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This invention recovers oils, nitrogen, and phosphorus from leachate, achieving resource utilization, turning waste into treasure, and effectively saving energy.

[0017] The technology is practical, advanced, stable and reliable, and the treated water is conducive to further wastewater treatment.

[0018] This invention features low operating costs, impact resistance, convenient management, simple operation and maintenance, and continuous operation of all components without frequent replacement, effectively reducing operating costs. Attached Figure Description

[0019] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0020] Figure 1 This is a schematic diagram of the structure of the oil-water separating and regulating tank of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the reaction tank of this utility model;

[0022] Figure 3 This is a schematic diagram of the centrifugal dehydrator of this utility model;

[0023] Figure 4 This is a schematic diagram of the sedimentation tank assembly of this utility model;

[0024] The symbols for the main components are explained below:

[0025] Oil separator 1, oil skimmer 11, heating system 12, air mixing system 13, first level gauge 14, lift pump 15;

[0026] 2. Reaction tank; 21. Second level gauge; 22. First agitator; 23. First pH meter; 24. Dosing system; 25. Screw pump; 26. Flow meter;

[0027] Centrifugal dehydrator 3, waste oil collection tank 31, nitrogen and phosphorus collection tank 32;

[0028] Sedimentation tank 4, second mixer 41, second dosing system 42, second pH meter 43. Detailed Implementation

[0029] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains; the terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0031] like Figure 1-4 As shown, a pretreatment device for leachate from wet waste includes an oil-water separation and conditioning tank 1. The oil-water separation and conditioning tank 1 is equipped with an oil skimmer 11, an air stirring system 13, and a heating system 12. The oil skimmer 1 is used to skim off floating oil in the oil-water separation and conditioning tank 1, and the heating system 12 is used to regulate the temperature in the oil-water separation and conditioning tank 1. The oil-water separation and conditioning tank 1 is connected to a reaction tank 2, which is used to treat the leachate by adding chemical agents. The reaction tank 2 is equipped with a first stirrer 22 and a chemical dosing system 24. The reaction tank 2 is connected to a centrifugal dewatering machine 3, which is connected to a collection unit for separately processing the substances produced by the centrifugal dewatering machine 3.

[0032] In this embodiment, the leachate from wet waste is transported via pipeline to the oil-water separation tank 1. Inside the tank, the wet waste undergoes oil-water separation. Because oil has a lower density than water, it floats on top. An oil skimmer 11 is used to skim off the floating oil. An air mixing system 13 is used to mix the wet waste. This system, also known as a pneumatic mixer, uses high-pressure gas to drive the mixing blades to rotate, thus achieving uniform mixing of the materials. For example, a handheld pneumatic mixer uses pneumatic power to drive the mixing head to rotate. The heating system uses steam heating. The oil skimmer 11 operates automatically. The wastewater, after being separated and heated, is pumped into… Once the wastewater in reaction tank 2 reaches the target level, the first mixer 22 is started, and chemicals are added simultaneously to react and generate a slow-release fertilizer rich in nitrogen and phosphorus. The reaction time is 1 hour. The pH of the liquid in reaction tank 2 is monitored by the first pH meter 23 to ensure that the pH is controlled between 9 and 9.5. It should be noted that the slow-release fertilizer rich in nitrogen and phosphorus is magnesium ammonium phosphate struvite (NH4MgPO4·6H2O). The resulting mud-water mixture is pumped into centrifugal dewatering machine 3 to separate water, oil, and sludge. The mixture then reaches the collection section for separate treatment. The chemical dosing system 24 operates automatically, adding chemicals including magnesium chloride, NaOH, PAC, and PAM.

[0033] Centrifugal dewatering machine 3 is a three-phase centrifugal dewatering machine used to simultaneously separate oil, water, and sludge. In this embodiment, centrifugal dewatering machine 18 is further defined.

[0034] Reference Figure 3 The collection section includes a waste oil collection tank 31 and a nitrogen and phosphorus collection tank 32. The oil separated by the centrifugal dewatering machine 3 enters the waste oil collection tank 31, and the sludge separated by the centrifugal dewatering machine 3 enters the nitrogen and phosphorus collection tank 32.

[0035] Reference Figure 3-4 The wastewater separated from the centrifugal dewatering machine 3 enters the sedimentation tank 4, which is equipped with a second mixer 41, a second pH meter 43, and a second dosing system 42. In this embodiment, the second mixer 41 is used to stir the wastewater in the sedimentation tank 4, so that the reagents and wastewater are mixed. The second dosing system 42 adds chemicals to the wastewater in the sedimentation tank 4, namely NaOH, PAC, PAM, and CaCl2. The second pH meter 43 is used to sense the pH of the wastewater, thereby controlling the pH at neutral through the pH sensing, removing excess pollutants in the wastewater, and creating conditions for subsequent processes. The generated sludge is returned to the oil-water separation and equalization tank 1 for secondary treatment.

[0036] The oil scraper 11 operates automatically, starting at regular intervals. These intervals and operating times can be adjusted independently. Preferably, the oil scraper 11 operates for 1 hour every 12 hours. In this embodiment, the operating time of the oil scraper 11 is further limited. During operation, the operating time and the interval between two runs can be adjusted according to the characteristics of the wet waste.

[0037] The heating system 12 uses steam heating and includes a steam switch valve connected to a temperature sensor. The temperature sensor controls the temperature between 55 and 60°C. In this embodiment, when the temperature sensor detects that the temperature inside the oil-water separator 1 reaches 60°C, it controls the steam switch valve to stop heating the oil-water separator 1. When the temperature sensor detects that the temperature inside the oil-water separator 1 drops to 55°C, it controls the steam switch valve to start heating the oil-water separator 1.

[0038] Reference Figure 1 The air mixing system 13 is in the normally open state and is used for mixing wastewater.

[0039] Reference Figure 1 and Figure 2 A first level gauge 14 and a second level gauge 21 are respectively installed and connected in the oil-water separation regulating tank 1 and the reaction tank 2. In this embodiment, the first level gauge 14 in the oil-water separation regulating tank 1 is used to monitor the liquid level in the oil-water separation regulating tank 1, and the second level gauge 21 is used to monitor the liquid level in the reaction tank 2.

[0040] Reference Figure 1 A booster pump 15 connects the oil-water separating tank 1 and the reaction tank 2. A screw pump 25 and a flow meter 26 are connected sequentially between the reaction tank 2 and the centrifugal dewatering machine 3. In this embodiment, the booster pump 15 transports the leachate in the oil-water separating tank 1 to the reaction tank 2. Then, the leachate that has been reacted in the reaction tank 2 is transported to the centrifugal dewatering machine 3 by the screw pump 25. The flow meter 26 is used to monitor the flow rate of the transported leachate.

[0041] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0042] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A device for pretreatment of leachate from wet waste, comprising an oil-water separation and equalization tank (1), characterized in that: The oil-water separation and conditioning tank (1) is equipped with an oil scraper (11), an air stirring system (13), and a heating system (12). The oil scraper (11) is used to scrape off the floating oil in the oil-water separation and conditioning tank (1). The heating system (12) is used to regulate the temperature in the oil-water separation and conditioning tank (1). The oil-water separation and conditioning tank (1) is connected to a reaction tank (2). The reaction tank (2) is used to treat the leachate by adding chemical agents. The reaction tank (2) is equipped with a first stirrer (22) and a dosing system (24). The reaction tank (2) is connected to a centrifugal dehydrator (3). The centrifugal dehydrator (3) is connected to a collection section. The collection section is used to process the substances produced by the centrifugal dehydrator (3) separately.

2. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: The centrifugal dewatering machine (3) is a three-phase centrifugal dewatering machine used to simultaneously separate oil, water and sludge.

3. The device for pretreatment of leachate from wet waste according to claim 2, characterized in that: The collection section includes a waste oil collection tank (31) and a nitrogen and phosphorus collection tank (32). The oil separated by the centrifugal dewatering machine (3) enters the waste oil collection tank (31), and the sludge separated by the centrifugal dewatering machine (3) enters the nitrogen and phosphorus collection tank (32).

4. The device for pretreatment of leachate from wet waste according to claim 3, characterized in that: The wastewater separated from the centrifugal dewatering machine (3) enters the sedimentation tank (4), which is equipped with a second agitator (41), a second pH meter (43) and a second dosing system (42).

5. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: The oil scraper (11) operates automatically, starting after a certain interval, and the interval and running time can be adjusted separately.

6. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: The heating system (12) uses steam heating and includes a steam switch valve. The steam switch valve is connected to a temperature sensor, which is used to control the temperature between 55 and 60°C.

7. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: The air mixing system (13) is normally open and is used for mixing wastewater.

8. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: The oil-water separating tank (1) and the reaction tank (2) are respectively equipped with a first level gauge (14) and a second level gauge (21).

9. The device for pretreatment of leachate from wet waste according to claim 1, characterized in that: A booster pump (15) is connected between the oil-water separation tank (1) and the reaction tank (2), and a screw pump (25) and a flow meter (26) are connected in sequence between the reaction tank (2) and the centrifugal dehydrator (3).

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