Coagulating, precipitating and air-floating integrated equipment for landfill leachate

Abstract

The utility model discloses coagulating sedimentation and air floatation integrated equipment for landfill leachate, and belongs to the field of water treatment. The equipment comprises a coagulation part, a precipitation part, an air flotation part and a dosing part which are integrally arranged, a coagulation stirring device is arranged in the coagulation part; the sedimentation part is of a vertical flow type sedimentation tank structure; the air floatation part comprises a dosing area, a releasing area, a settling area, a deslagging area and a clear water area; an air flotation stirring device is arranged in the dosing area, a dissolved air releaser is arranged in the release area, and a slag scraping device is arranged at the top of the settling area; the slag scraping device is used for scraping a slag layer formed at the upper part of the settling zone to the slag discharging zone; a water passing pipe assembly communicated with the clear water area is arranged in the middle of the settling area; a dosing stirring device is arranged in a medicine box body of the dosing part, and is respectively communicated with the coagulation part and the dosing area through a dosing pump assembly. According to the utility model, coagulation, sedimentation, air floatation and dosing devices are highly integrated into integrated equipment, the structure is compact, the occupied area of the equipment structure is small, and the cost is low.

Description

Technical Field

[0001] The utility model belongs to the field of water treatment, and specifically relates to the early stage pretreatment of high-concentration organic wastewater such as aquaculture wastewater or garbage leachate. Background Art

[0002] As people's living standards improve, the amount of domestic waste is increasing, and the amount of perishable waste such as kitchen waste, restaurant waste, and fresh fruit and vegetable waste is also increasing. At present, domestic waste is mainly processed through three steps: front-end collection, intermediate compression and transportation, and terminal disposal. The terminal treatment methods mainly include incineration, landfill, anaerobic fermentation, and composting. Due to the complex physical composition of domestic waste in my country and the fact that perishable waste accounts for 55-65% of the total domestic waste, about 15-20% of high-concentration leachate is usually produced during the treatment process. The leachate contains heavy metals, ammonia nitrogen, phosphorus, COD and other pollutants. Therefore, it must be treated and stabilized to meet relevant standards before it can be discharged.

[0003] The leachate generated during the compression and transportation of domestic garbage and the crushing and dehydration of perishable garbage has the characteristics of high COD concentration, high ammonia nitrogen concentration, and contains a large amount of particulate matter and oil residue. If it is directly discharged into the leachate denitrification and carbon removal treatment equipment without front-end pretreatment, it will not only increase the processing load at the back end, but also easily cause pump and pipeline blockage, increase the subsequent after-sales maintenance frequency and operation and maintenance costs, so the front-end pretreatment measures of the leachate are crucial. Usually, the leachate is pretreated mainly by flotation or coagulation sedimentation, but the use of flotation or coagulation equipment alone cannot adapt to the leachate generated by the extrusion and dehydration of perishable garbage containing a large amount of oil residue, and it is difficult to remove light pollutants such as easily settled particulate matter or floating oil at the same time; and if the flotation equipment and coagulation equipment are purchased separately, there are problems such as large floor space, repeated redundancy of the control system and the dosing system.

[0004] In this regard, the utility model intends to design and develop an integrated coagulation and sedimentation flotation equipment based on the existing mature flotation machine and combined with the structural characteristics of the coagulation and sedimentation equipment, so as to solve the problems encountered in the implementation of the project, such as limited land area for the renovation of old transfer stations, poor pretreatment effect, and high cost of pretreatment equipment. Utility Model Content

[0005] The utility model aims to solve the technical problems existing in the existing equipment and processes and to provide a garbage leachate coagulation, sedimentation and flotation integrated equipment.

[0006] The specific technical solutions adopted by this utility model are as follows:

[0007] The utility model provides a garbage leachate coagulation, sedimentation and flotation integrated equipment, comprising a coagulation part, a sedimentation part, a flotation part and a dosing part which are integrated and arranged in one piece;

[0008] The coagulation part is an open box, the cross section of which in the vertical direction gradually decreases and forms a first cone; one side of the box is connected to the water inlet pipe, and a coagulation stirring device for mixing the reagent and the leachate evenly is provided inside, and the bottom is connected to the sludge tank through a pipeline;

[0009] The sedimentation part is a vertical flow sedimentation tank structure, the bottom of which is connected to the sludge tank through a pipeline; the leachate from the coagulation part enters the sedimentation part through the central guide device, and the leachate from the sedimentation part enters the flotation part through the third overflow weir;

[0010] The flotation part includes a dosing area, a release area, a sedimentation area, a slag discharge area and a clean water area which are arranged in sequence along the water flow direction; the dosing area is provided with an air flotation stirring device for evenly mixing the agent and the leachate, the release area is provided with a dissolved air releaser, and the top of the sedimentation area is provided with a slag scraping device which can move along the water flow direction; the slag scraping device is used to scrape the slag layer formed on the upper part of the sedimentation area to the slag discharge area, and the slag discharge area is provided with a slag discharge port which is connected to the sludge tank through a pipeline; the middle of the sedimentation area is provided with a water pipe assembly which is connected to the clean water area, and the bottom is connected to the sludge tank through a sludge discharge pipe;

[0011] The dosing part comprises a medicine box body; a dosing stirring device is arranged in the medicine box body and is respectively connected with the coagulation part and the dosing area through a dosing pump assembly.

[0012] Preferably, a first overflow weir and a second overflow weir are provided in the inner circumferential direction of the box body of the coagulation part; the first overflow weir is provided adjacent to a side of the water inlet pipe, and the second overflow weir is provided adjacent to a side of the water outlet of the coagulation part.

[0013] Preferably, the cross-section of the sedimentation part in the vertical direction gradually decreases and forms a second cone, and a central guide device is provided inside, which includes a vertical pipeline and a horizontal pipeline; the vertical pipeline is located in the center of the sedimentation part and is connected to the upper leachate of the coagulation part through the horizontal pipeline.

[0014] Preferably, a third overflow weir is provided in the inner circumferential direction of the box body of the sedimentation part, and the leachate of the sedimentation part enters the dosing area of ​​the flotation part through the sedimentation part.

[0015] Preferably, the dissolved air releaser is connected to a dissolved air tank located outside the air flotation part through a pipeline; the dissolved air tank contains water and is provided with a dissolved air water pump for introducing air into the water.

[0016] Preferably, the dosing part is arranged adjacent to the precipitation part and the flotation part.

[0017] Preferably, the coagulation stirring device is located at the center of the coagulation part.

[0018] Preferably, a water outlet is provided on the side wall of the clean water area.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1) The utility model utilizes a sedimentation method to separate the mud and water of the mud-water mixture after coagulation, so that the sludge with large particle size and heavy specific gravity is precipitated, and then the small particle size and light specific gravity are floated and removed by an air flotation method, thereby achieving effective treatment of the leachate.

[0021] 2) The utility model adopts an integrated structure of coagulation, sedimentation and flotation, and an external dosing device is assembled together. The inclined plate structure is used as the ultimate sedimentation, which effectively improves the mud-water separation efficiency and reduces the equipment volume and floor space.

[0022] 3) The utility model can effectively realize full utilization of medicines and reduce consumption of medicines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view of a landfill leachate coagulation, sedimentation and flotation integrated equipment;

[0024] Figure 2 It is a structural schematic diagram of a landfill leachate coagulation, sedimentation and flotation integrated equipment;

[0025] Figure 3 It is a side view of a landfill leachate coagulation, sedimentation and flotation integrated equipment;

[0026] In the figure: coagulation part 01, sedimentation part 02, flotation part 03, dosing area 04, flotation stirring device 05, release area 06, dissolved air releaser 07, sedimentation area 08, dissolved air tank 09, scraper device 10, water pipe assembly 11, dissolved air water pump 12, slag discharge area 13, clean water area 14, mud discharge pipe 15, central guide device 16, second cone 17, third overflow weir 18, second overflow weir 19, first cone 20, coagulation stirring device 21, first overflow weir 22, water inlet pipe 23, dosing part 24, medicine box 25, dosing stirring device 26, dosing pump assembly 27. DETAILED DESCRIPTION

[0027] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific implementations. The technical features of each implementation of the present invention can be combined accordingly without conflicting with each other.

[0028] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it can be directly connected to another element or indirectly connected, that is, there are intermediate elements. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0029] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0030] like Figure 1 and 2 As shown, the utility model provides a landfill leachate coagulation, sedimentation and flotation integrated equipment, which mainly includes a coagulation part 01, a sedimentation part 02, a flotation part 03 and a dosing part 24, and each part is integrated and arranged through a connecting frame. The equipment integrates coagulation, sedimentation, flotation and dosing devices into an integrated device, which is highly integrated, compact in structure, small in footprint and low in cost.

[0031] The structure and connection method of each part will be described in detail below.

[0032] In the utility model, the coagulation part 01 is an open box, the horizontal cross section in the box gradually decreases from top to bottom along the vertical direction and forms a first cone 20 structure, and the side wall of the box and the upper surface of the first cone 20 together form a reaction zone for holding leachate and reagents. A water inlet is opened on one side of the box and connected to the water inlet pipe 23. A coagulation stirring device 21 is provided inside the box, and the coagulation stirring device 21 is used to mix the reagent and leachate evenly. The bottom of the box is connected to the sludge tank through a pipeline, which is used to discharge the precipitated sludge regularly.

[0033] As a preferred embodiment of the utility model, a first overflow weir 22 and a second overflow weir 19 are provided in the circumferential direction of the box body of the coagulation part 01. The first overflow weir 22 is provided near one side of the water inlet pipe 23, and the second overflow weir 19 is provided near one side of the water outlet of the coagulation part 01.

[0034] In actual use, the leachate enters the coagulation part 01 through the water inlet pipe 23, and appropriate reagents are added to the coagulation part 01. The leachate and the reagents are fully mixed and contacted through the coagulation stirring device 21. The liquid passes through the first overflow weir 22 to the second overflow weir 19, and then enters the sedimentation part 02 through the central guide device 16. The sludge settles through the first cone 20 and is finally discharged into the sludge tank. The coagulation stirring device 21 is located at the center of the coagulation part 01.

[0035] In the present invention, the sedimentation part 02 is a vertical flow sedimentation tank structure, and the bottom is connected to the sludge tank through a pipeline. The leachate of the coagulation part 01 enters the sedimentation part 02 through the central guide device 16, and the leachate of the sedimentation part 02 enters the flotation part 03 through the third overflow weir 18.

[0036] As a preferred embodiment of the utility model, the horizontal cross section in the box of the sedimentation part 02 gradually decreases from top to bottom along the vertical direction and forms a second cone 17 structure, and the side wall of the box and the upper surface of the second cone 17 together form a reaction zone for holding the leachate. A central flow guide device 16 is provided inside the reaction zone, and the central flow guide device 16 includes a vertical pipeline and a horizontal pipeline. The vertical pipeline is located at the center of the sedimentation part 02 and is connected to the upper leachate of the coagulation part 01 through the horizontal pipeline.

[0037] As a preferred embodiment of the utility model, a third overflow weir 18 is provided in the circumferential direction of the box body of the sedimentation part 02 , and the leachate of the sedimentation part 02 enters the dosing area 04 of the flotation part 03 through the sedimentation part 02 .

[0038] In actual use, the leachate after the reaction in the coagulation part 01 enters the sedimentation part 02 through the central guide device 16, the sludge is gathered at the bottom of the box through the second cone 17, and the leachate after the treatment in the sedimentation part 02 enters the flotation part 03 through the third overflow weir 18.

[0039] In the utility model, the air flotation part 03 includes a dosing area 04, a release area 06, a sedimentation area 08, a slag discharge area 13 and a clean water area 14 which are sequentially arranged along the water flow direction. An air flotation stirring device 05 is arranged in the dosing area 04, and the air flotation stirring device 05 is used to mix the agent and the leachate evenly. A dissolved air releaser 07 is arranged in the release area 06, and the dissolved air releaser 07 is used to add the water flow after the air is dissolved into the leachate. A slag scraping device 10 which can move along the water flow direction is arranged on the top of the sedimentation area 08, and the slag scraping device 10 is used to scrape the slag layer formed on the upper part of the sedimentation area 08 to the slag discharge area 13. The slag discharge area 13 is provided with a slag discharge port, and the slag discharge port is connected to the sludge pool through a pipeline. A water pipe assembly 11 connected to the clean water area 14 is arranged in the middle of the sedimentation area 08, and the bottom is connected to the sludge pool through a mud discharge pipe 15.

[0040] As a preferred embodiment of the present invention, Figure 3 As shown, the dissolved air releaser 07 is connected to the dissolved air tank 09 located outside the air flotation part 03 through a pipeline. The dissolved air tank 09 contains water and is provided with a dissolved air water pump 12 for introducing air into the water. A water outlet is provided on the side wall of the clear water area 14.

[0041] In actual use, after the leachate enters the dosing area 04, appropriate reagents are introduced into the dosing area 04 through the dosing part 24, and the leachate is fully stirred and mixed by the air flotation stirring device 05, and then the leachate enters the release area 06. In the release area 06, the dissolved air pump 12 generates gas and enters the dissolved air tank 09 and dissolves in the water. The water dissolved with air is added to the release area 06 through the dissolved air releaser 07 and mixed with the leachate. In the sedimentation area 08, the saturated water microbubbles generated by the dissolved air adhere to the solid surface, and the light solid (lower density than water) lifts it to the water surface and distributes it throughout the width of the tank, ensuring the best solid-liquid separation effect. The slag layer that rises to the top is scraped to the slag discharge area 13 by the scraper device 10, and finally enters the sludge tank through the slag discharge port. The clean water in the sedimentation area is discharged from the middle through the water pipe assembly 11 to the clean water area 14, and the sludge is collected in the sludge tank through the mud discharge pipe 15.

[0042] In the present invention, the dosing part 24 includes a dosing box 25. A dosing stirring device 26 is arranged in the dosing box 25, and is connected to the coagulation part 01 and the dosing area 04 respectively through a dosing pump assembly 27.

[0043] As a preferred embodiment of the present invention, the dosing part 24 is disposed adjacent to the precipitation part 02 and the flotation part 03 .

[0044] In actual use, the medicines are respectively loaded into corresponding medicine boxes 25 , and different medicine boxes 25 are respectively stirred by the medicine adding stirring device 26 to make the medicines fully dissolved in water, and then added into the corresponding boxes by the medicine adding pump assembly 27 .

[0045] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A landfill leachate coagulation, sedimentation and flotation integrated equipment, characterized in that: It includes a coagulation part (01), a sedimentation part (02), a flotation part (03) and a dosing part (24) which are integrated into one body; The coagulation part (01) is an open box, the cross section of which gradually decreases in the vertical direction to form a first cone (20); one side of the box is connected to a water inlet pipe (23), a coagulation stirring device (21) for uniformly mixing the reagent and the leachate is provided inside, and the bottom is connected to the sludge tank through a pipeline; The sedimentation part (02) is a vertical flow sedimentation tank structure, and the bottom is connected to the sludge tank through a pipeline; the leachate of the coagulation part (01) enters the sedimentation part (02) through the central guide device (16), and the leachate of the sedimentation part (02) enters the flotation part (03) through the third overflow weir (18); The air flotation part (03) comprises a dosing area (04), a release area (06), a sedimentation area (08), a slag discharge area (13) and a clean water area (14) which are sequentially arranged along the water flow direction; the dosing area (04) is provided with an air flotation stirring device (05) for evenly mixing the agent and the leachate, the release area (06) is provided with a dissolved air releaser (07), and the top of the sedimentation area (08) is provided with a slag scraping device (10) which can move along the water flow direction; the slag scraping device (10) is used to scrape the slag layer formed on the upper part of the sedimentation area (08) to the slag discharge area (13), and the slag discharge area (13) is provided with a slag discharge port which is connected to the sludge pool through a pipeline; the middle part of the sedimentation area (08) is provided with a water pipe assembly (11) which is connected to the clean water area (14), and the bottom is connected to the sludge pool through a sludge discharge pipe (15); The dosing part (24) comprises a drug box (25); a dosing stirring device (26) is arranged inside the drug box (25) and is connected to the coagulation part (01) and the dosing area (04) respectively through a dosing pump assembly (27).

2. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: A first overflow weir (22) and a second overflow weir (19) are provided in the circumferential direction of the box body of the coagulation part (01); the first overflow weir (22) is provided on a side adjacent to the water inlet pipe (23), and the second overflow weir (19) is provided on a side adjacent to the water outlet of the coagulation part (01).

3. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: The cross-section of the box body of the sedimentation part (02) gradually decreases in the vertical direction to form a second cone (17), and a central flow guide device (16) is provided inside. The central flow guide device (16) includes a vertical pipeline and a horizontal pipeline; the vertical pipeline is located at the center of the sedimentation part (02) and is connected to the upper leachate of the coagulation part (01) through the horizontal pipeline.

4. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: A third overflow weir (18) is provided in the circumferential direction of the box body of the sedimentation part (02), and the percolate of the sedimentation part (02) enters the dosing area (04) of the flotation part (03) through the sedimentation part (02).

5. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: The dissolved air releaser (07) is connected to a dissolved air tank (09) located outside the air flotation part (03) through a pipeline; the dissolved air tank (09) contains water and is provided with a dissolved air water pump (12) for introducing air into the water.

6. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: The drug adding part (24) is arranged adjacent to the precipitation part (02) and the flotation part (03).

7. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: The coagulation and stirring device (21) is located at the center of the coagulation part (01).

8. The integrated equipment for coagulation, sedimentation and flotation of landfill leachate according to claim 1, characterized in that: A water outlet is provided on the side wall of the clean water area (14).

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