Integrated equipment and method for landfill leachate membrane separation pretreatment and concentrated liquid treatment

Abstract

The invention relates to an integrated device and method for landfill leachate membrane separation pretreatment and concentrated liquid treatment, belonging to the technical field of landfill leachate treatment. The device comprises a biochemical tank, a sedimentation tank, an evaporation tank and a condensation tank, wherein the biochemical tank, the sedimentation tank and the evaporation tank are integrated and arranged in a shell; the biochemical tank is filled with filtered landfill leachate and Rhizopus oryzae; the sedimentation tank is connected with a horizontal conveyor belt, a lifting conveyor belt, a drug feeding hole and a liquid collection pipe, and the liquid collection pipe conveys the clear liquid in the sedimentation tank to a membrane treatment process unit; the evaporation tank is connected with a second liquid inlet pipe and a dust suction pipe, the second liquid inlet pipe is connected with the membrane treatment process unit and is used to convey the concentrated liquid generated by the membrane treatment to the evaporation tank; the condensation tank collects water evaporated from the evaporation tank; the condensation tank is connected with the biochemical tank, and water is drained to the biochemical tank through the condensation tank to increase the pH value in the biochemical tank; the device can solve the technical problems of repeated operation of landfill leachate membrane separation treatment in the prior art, which leads to reagent waste and equipment redundancy.

Description

Technical Field

[0001] The present invention belongs to the technical field of landfill leachate treatment, and in particular relates to an integrated device and method for landfill leachate membrane separation pretreatment and concentrated liquid treatment. Background Art

[0002] The zero liquid discharge (ZLD) closed-loop system is of great significance in the field of landfill leachate treatment. Through the integration of the entire process of pretreatment, membrane separation, and evaporation and crystallization, it realizes the full resource utilization of leachate, producing reusable water and crystallized salt with potential utilization value.

[0003] The existing patent with announcement number CN106145532B discloses a combined biochemical and evaporation treatment system and process for landfill leachate. The system comprises a pretreatment tank, an MBR biochemical treatment system, a reverse osmosis system, a coagulation and sedimentation tank, and an evaporation system, which are connected in sequence. The MBR biochemical treatment system comprises an MBR membrane bioreactor and an ultrafiltration membrane separation device. The pretreatment tank is provided with a leachate outlet connected to the MBR membrane bioreactor, the water outlet of the MBR membrane bioreactor is connected to the ultrafiltration membrane separation device, the ultrafiltration membrane separation device is provided with an upper layer clear liquid outlet connected to the reverse osmosis system, and a lower layer sludge outlet connected to a sludge dewatering machine; the clear liquid outlet of the reverse osmosis system is connected to a reuse water tank, and the concentrated liquid outlet is connected to a coagulation and sedimentation tank; the upper layer clear liquid outlet of the coagulation and sedimentation tank is connected to the evaporation system, and the lower layer sludge outlet is connected to the sludge dewatering machine; the distilled water outlet of the evaporation system is connected to the reuse water tank, and the concentrated liquid outlet is connected to the solid-liquid separation system, and a mother liquor circulation loop is provided between the solid-liquid separation system and the evaporation system.

[0004] The existing technology has the following problems:

[0005] The pretreatment tank only performs preliminary treatment on the original leachate (pH adjustment, suspended matter / heavy metal precipitation, and carbon source addition), while the reverse osmosis concentrate needs to enter the coagulation sedimentation tank separately for secondary pH adjustment, precipitation, and flocculation. Repeated operations lead to waste of reagents and equipment redundancy. Summary of the Invention

[0006] The present invention provides an integrated device and method for landfill leachate membrane separation pretreatment and concentrated liquid treatment, which can solve the technical problems of repeated operations in landfill leachate membrane separation treatment in the prior art leading to reagent waste and equipment redundancy.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] The present application provides an integrated device for landfill leachate membrane separation pretreatment and concentrated liquid treatment, comprising a biochemical tank, a sedimentation tank, an evaporation tank, and a condensation tank, and also comprising:

[0009] A shell, wherein the biochemical pool, the sedimentation pool and the evaporation pool are integrated into the shell;

[0010] The biochemical pool is filled with filtered landfill leachate and Rhizopus oryzae, and the upper layer liquid in the biochemical pool after the biochemical reaction of the Rhizopus oryzae is sent to the sedimentation tank;

[0011] The sedimentation tank is connected to a horizontal conveyor belt, an elevating conveyor belt, a dosing hole, and a liquid collection pipe. The sediment generated after the dosing hole is moved by the horizontal conveyor belt to the elevating conveyor belt, and then lifted and sent to the evaporation tank. The liquid collection pipe transports the clear liquid in the sedimentation tank to the membrane treatment process unit.

[0012] The evaporation pool is connected to a second liquid inlet pipe and a dust suction pipe. The second liquid inlet pipe is connected to the membrane treatment process unit and is used to transport the concentrated liquid generated by the membrane treatment to the evaporation pool. The dust suction pipe is used to suck out the residual crystals in the evaporation pool for reuse.

[0013] The condensation pool collects water evaporated from the evaporation pool, and the condensation pool is connected to the biochemical pool. Water is drained to the biochemical pool through the condensation pool to increase the pH value in the biochemical pool to meet the survival of the Rhizopus oryzae.

[0014] Through the above technical solution, the pretreatment and concentrate treatment are integrated into an integrated design, which reduces the technical problems of reagent waste and equipment redundancy caused by repeated operations.

[0015] In the present invention, the above-mentioned integrated equipment also includes a fuel cell and a battery. The fuel cell is connected in the shell. The fuel cell is connected to an air intake pipe and an air intake pipe. The air intake pipe absorbs air, and the air intake pipe absorbs the gas generated by the biochemical pool; the battery is electrically connected to the fuel cell.

[0016] Through the above technical solution, fuel cells are used to fully utilize the hydrocarbon gas and air produced by the biochemical pool to generate electricity, reducing the equipment's demand for external power supply.

[0017] In the present invention, the evaporation pool includes an evaporation table and a temperature-regulating water pipe, wherein the evaporation table is connected to the bottom of the evaporation pool; the temperature-regulating water pipe is laid in the evaporation table, and the temperature-regulating water pipe is connected to a water pump;

[0018] The fuel cell is a solid oxide fuel cell. A heat dissipation water pipe is provided around the outer side of the fuel cell. The water pump is connected to the heat dissipation water pipe.

[0019] Through the above technical solution, the waste heat of the solid oxide fuel cell is used as the heat source of the evaporation table, which avoids the use of additional heating equipment and improves energy saving.

[0020] In the present invention, the evaporation pool further comprises evaporation columns and a heat-variable volume body. A plurality of evaporation columns are connected in a lifting manner in the evaporation table; the heat-variable volume body abuts against the lower ends of the evaporation columns.

[0021] Through the above technical solution, a thermally variable volume body is used to raise and lower the evaporation column according to temperature changes, so that the evaporation column can rub against the evaporation table to separate the crystals, thereby reducing the additional scraper device and further simplifying the equipment structure.

[0022] In the present invention, the above-mentioned integrated equipment also includes a negative pressure pipe, which has a three-way structure, and its three end openings are respectively arranged on the outside of the shell, the inside of the biochemical pool, and the side wall of the sedimentation tank.

[0023] Through the above technical solution, a negative pressure tube is used to absorb the liquid in the biochemical pool, thereby avoiding blockage and corrosion of the power device and improving the durability of the equipment.

[0024] In the present invention, the horizontal conveyor belt is connected to a first motor, and the lifting conveyor belt is connected to a second motor. Both the first motor and the second motor are electrically connected to the battery.

[0025] Through the above technical solution, independent motors are used to drive the two conveyor belts respectively, so that the horizontal conveyor belt can run independently to stir the liquid in the sedimentation tank to allow it to fully settle.

[0026] In the present invention, the upper end surface of the evaporation table is a ceramic layer, the evaporation column is a brass column, and the evaporation column has a structure that is thick at the bottom and narrow at the top.

[0027] Through the above technical solution, the thermal expansion and contraction of brass and the expansion of the thermally variable capacitance body are utilized, so that each part of the evaporation column can fully scrape against the ceramic layer with small thermal deformation, thereby improving the separation effect of the crystallized matter.

[0028] The present application provides a method for membrane separation pretreatment of landfill leachate and concentrated liquid treatment, using the above-mentioned integrated equipment for membrane separation pretreatment of landfill leachate and concentrated liquid treatment, and further comprising the following steps:

[0029] Step S1: culturing Rhizopus oryzae in a biochemical pool;

[0030] Step S2: injecting new landfill leachate into the biochemical pool, subjecting it to biochemical treatment with Rhizopus oryzae, monitoring the pH value change in the biochemical pool, and when the pH value drops to the minimum value and rebounds, pumping the upper layer of liquid in the biochemical pool into the sedimentation tank;

[0031] Step S3: adding sodium hydroxide into the sedimentation tank through the dosing hole, and simultaneously starting the first motor to drive the horizontal conveyor belt to rotate and stir. After monitoring the pH change to be neutral, starting the second motor to drive the lifting conveyor belt to transport the sediment to the evaporation tank;

[0032] Step S4: transporting the supernatant in the sedimentation tank to the membrane treatment process unit for treatment and transporting the concentrated liquid generated after the membrane treatment back to the evaporation tank;

[0033] Step S5: The hot water generated by the waste heat of the fuel cell is pumped into the temperature-controlled water pipe to perform water-insulated evaporation and crystallization on the liquid in the evaporation pool. The crystals after evaporation are reused, and the condensed water generated by evaporation is collected in the condensation pool.

[0034] Through the above technical solution, a coordinated treatment method of pretreatment and concentrated liquid treatment is adopted, which reduces repeated dosing and repeated pH value adjustment and reduces equipment redundancy.

[0035] In the present invention, in the above step S5: hot water causes the evaporation column to rise, and crystals are formed on the outer surface of the portion of the evaporation column that extends out of the evaporation table. After evaporation is completed, cold water in the condensation tank is pumped into the temperature-controlled water pipe to cause the evaporation column to sink, and the crystals on it are separated by scraping between the evaporation column and the evaporation table.

[0036] Through the above technical solution, the automation of crystallization separation is improved by utilizing temperature difference changes to raise and lower the evaporation column.

[0037] In the present invention, the above-mentioned landfill leachate membrane separation pretreatment and concentrated liquid treatment method further includes the following steps:

[0038] Step S6: The condensed water in the condensation pool is discharged into the biochemical pool to increase the pH value in the biochemical pool.

[0039] Through the above technical solution, the by-products of the concentrated liquid treatment are fully utilized to adjust the pH value of the biochemical pool, thereby improving the synergy between the pretreatment and the concentrated liquid treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A process flow chart of an integrated device for membrane separation pretreatment of landfill leachate and concentrated liquid treatment and a membrane treatment process unit provided in an embodiment of the present invention;

[0042] Figure 2 An axonometric diagram of an integrated device for membrane separation pretreatment of landfill leachate and concentrated liquid treatment provided by an embodiment of the present invention;

[0043] Figure 3A front view of an integrated device for membrane separation pretreatment of landfill leachate and concentrated liquid treatment provided by an embodiment of the present invention;

[0044] Figure 4 for Figure 3 The sectional view at AA in FIG;

[0045] Figure 5 for Figure 4 A local enlarged view of point B in FIG;

[0046] Figure 6 A side view of an integrated device for membrane separation pretreatment of landfill leachate and concentrated liquid treatment provided by an embodiment of the present invention;

[0047] Figure 7 for Figure 6 Cross-sectional view at CC in FIG;

[0048] Figure 8 This is an axonometric diagram of an integrated device for membrane separation pretreatment of landfill leachate and concentrated liquid treatment provided by an embodiment of the present invention, with the shell removed.

[0049] Icon: 1-shell; 2-biochemical pool; 201-first liquid inlet pipe; 202-negative pressure pipe; 3-sedimentation tank; 301-liquid extraction pipe; 302-dosing hole; 303-horizontal conveyor belt; 3031-first motor; 304-lifting conveyor belt; 3041-second motor; 4-evaporation tank; 401-second liquid inlet pipe; 402-dust suction pipe; 403-evaporation table; 4031-evaporation column; 4032-thermal variable volume body; 4033-temperature regulating water pipe; 404-water pump; 5-condensation tank; 501-condensation plate; 6-fuel cell; 601-inlet pipe; 602-intake pipe; 603-heat dissipation water pipe; 604-battery. DETAILED DESCRIPTION

[0050] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0051] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 cannot be understood as a limitation on this application.

[0052] 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 one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "connection" should be understood in a broad sense. For example, they can refer to welding, bolting, or riveting; fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0054] Example:

[0055] Please refer to Figures 1 to 8 , Figures 1 to 8 An embodiment of the present application is shown.

[0056] This embodiment provides an integrated device for landfill leachate membrane separation pretreatment and concentrated liquid treatment, such as Figures 1 to 4 As shown, it includes a biochemical pool 2, a sedimentation pool 3, an evaporation pool 4 and a condensation pool 5, and also includes a shell 1, and the biochemical pool 2, the sedimentation pool 3 and the evaporation pool 4 are integrated into the shell 1;

[0057] The biochemical pool 2 is filled with filtered landfill leachate and Rhizopus oryzae, as shown in FIG. Figure 4 As shown, the upper layer liquid after the biochemical reaction of Rhizopus oryzae in the biochemical pool 2 is sent to the sedimentation pool 3 through the negative pressure pipe 202;

[0058] The sedimentation tank 3 is connected to a horizontal conveyor belt 303, an elevating conveyor belt 304, a dosing hole 302, and a liquid collection pipe 301. The sediment generated after the dosing hole 302 is moved by the horizontal conveyor belt 303 to the elevating conveyor belt 304, and then is lifted and sent to the evaporation tank 4. The liquid collection pipe 301 transports the clear liquid in the sedimentation tank 3 to the membrane treatment process unit.

[0059] The evaporation pool 4 is connected to a second liquid inlet pipe 401 and a dust suction pipe 402. The second liquid inlet pipe 401 is connected to the membrane treatment process unit and is used to transport the concentrated liquid generated by the membrane treatment to the evaporation pool 4. The dust suction pipe 402 is used to suck out the residual crystals in the evaporation pool 4 for reuse.

[0060] The condensation pool 5 collects water evaporated from the evaporation pool 4. The condensation pool 5 is connected to the biochemical pool 2. Water is drained to the biochemical pool 2 through the condensation pool 5 to increase the pH value in the biochemical pool 2 to meet the survival of Rhizopus oryzae.

[0061] The zero liquid discharge (ZLD) closed-loop system is of great significance in the field of landfill leachate treatment. By integrating the entire process of pretreatment, membrane separation, and evaporation and crystallization, it achieves 100% resource utilization of leachate, producing reusable water and crystallized salt with potential utilization value. However, in the existing technology, the equipment investment cost is high, involving a variety of complex treatment units and specialized equipment; the operating energy consumption is high, especially in the membrane separation and evaporation and crystallization stages, resulting in high treatment costs; in particular, problems such as membrane fouling and scaling need to be dealt with regularly, otherwise they are likely to affect system performance and service life. In this embodiment, the concentrated liquid and the precipitate from the pretreatment stage are directly evaporated and crystallized together to form a solid product, avoiding classification in the landfill leachate treatment stage and achieving separation in the later process, thereby reducing a large amount of equipment and energy consumption.

[0062] At the same time, Rhizopus oryzae can secrete extracellular enzymes such as amylase, protease, and lipase, which can efficiently decompose carbohydrates, proteins, and fat-like organic matter in the leachate, reducing the COD (chemical oxygen demand) load. At the same time, the cell wall of Rhizopus oryzae contains chitin and polysaccharides, which can remove heavy metal ions such as Cu²⁺ and Pb²⁺ through electrostatic adsorption or complexation.

[0063] Rhizopus oryzae can grow in the pH range of 3.0-7.0 (the pH value of fresh leachate from landfill for 1-5 years is generally 4.5-6) and the temperature range of 25℃-40℃, and can adapt to the fluctuations in water quality of landfill leachate. The extracellular polymers (EPS) secreted by it can promote the agglomeration of suspended matter and improve the subsequent solid-liquid separation effect. The fermentation products (such as lactic acid and fumaric acid) can be recycled to reduce treatment costs.

[0064] Through the above technical solution, the pretreatment and concentrate treatment are integrated into an integrated design, which reduces the technical problems of reagent waste and equipment redundancy caused by repeated operations.

[0065] As a preferred embodiment, the above-mentioned integrated device also includes a fuel cell 6 and a battery 604. The fuel cell 6 is connected to the shell 1. The fuel cell 6 is connected to an air intake pipe 601 and an air intake pipe 602. The air intake pipe 601 absorbs air, and the air intake pipe 602 absorbs the gas generated by the biochemical pool 2; the battery 604 is electrically connected to the fuel cell 6.

[0066] The ammonia and methane gases generated in the biochemical pool 2 are sucked into the fuel cell 6 through the intake pipe 602 and react with the air sucked in by the intake pipe 601 .

[0067] It should be noted that the fuel cell 6 in this embodiment, in addition to the fuel cell stack body, also includes other components required for its operation including but not limited to an air pump, a transformer, etc.

[0068] Through the above technical solution, the fuel cell 6 is used to fully utilize the hydrocarbon gas and air generated by the biochemical pool 2 to generate electricity, thereby reducing the equipment's demand for external power supply.

[0069] As a preferred embodiment, the evaporation pool 4 includes an evaporation table 403 and a temperature-regulating water pipe 4033. The evaporation table 403 is connected to the bottom of the evaporation pool 4. The temperature-regulating water pipe 4033 is laid inside the evaporation table 403 and is connected to a water pump 404.

[0070] The fuel cell 6 is a solid oxide fuel cell. A heat dissipation water pipe 603 is provided around the outer side of the fuel cell 6 . The water pump 404 is connected to the heat dissipation water pipe 603 .

[0071] Solid oxide fuel cell (SOFC) is a power generation device that directly oxidizes methane into CO2 and water at high temperature (600-1000℃), with a power generation efficiency of 50%-60% and waste heat recovery. At the same time, ammonia will also directly decompose NH3 into N2 and H2 at the high temperature inside the solid oxide fuel cell (SOFC). H2 participates in the electrochemical reaction, with a power generation efficiency of 40%-50%.

[0072] Through the above technical solution, the waste heat of the solid oxide fuel cell 6 is used as the heat source of the evaporation table 403, avoiding the use of additional heating equipment and improving energy saving.

[0073] As a better implementation method, Figure 5 As shown, the evaporation pool 4 further includes evaporation columns 4031 and heat-variable bodies 4032 . A plurality of evaporation columns 4031 are connected to the evaporation platform 403 in a lifting manner; the heat-variable bodies 4032 abut against the lower ends of the evaporation columns 4031 .

[0074] When using, Figure 7As shown, the water pump 404 pumps hot water generated by absorbing waste heat from the fuel cell 6 in the heat dissipation water pipe 603 into the temperature-regulating water pipe 4033 for circulation, causing the heat-variable volume 4032 (preferably paraffin) to expand and lift the evaporation column 4031. The heat conduction of the evaporation column 4031 then heats the sediment and concentrated liquid above the evaporation table 403. The concentrated liquid enters the evaporation pool 4 through the second liquid inlet pipe 401. The mixture in the evaporation pool 4 can be sampled through the dust suction pipe 402 to determine the evaporation status. After evaporation is completed, cooling water from the condensation pool 5 is introduced into the temperature-regulating water pipe 4033 to cause the heat-variable volume 4032 to contract, lowering the evaporation column 4031. Simultaneously, the evaporation products are further separated by scraping between the evaporation table 403 and the evaporation column 4031. The solid waste remaining after evaporation is sucked out by negative pressure suction and used for filling building materials or further industrial separation and reuse.

[0075] Through the above technical solution, the thermally variable volume body 4032 is used to raise and lower the evaporation column 4031 according to temperature changes, so that the evaporation column 4031 can rub against the evaporation table 403 to separate the crystals, thereby reducing the need for additional scraper devices and further simplifying the equipment structure.

[0076] As a better implementation method, Figure 4 As shown, the above-mentioned integrated equipment also includes a negative pressure pipe 202, which has a three-way structure, and its three end openings are respectively arranged on the outside of the shell 1, in the biochemical pool 2, and on the side wall of the sedimentation tank 3.

[0077] When in use, an external air source is used to blow inwards, forming a negative pressure in the pipe to blow the liquid in the biochemical pool 2 into the sedimentation pool 3.

[0078] Through the above technical solution, the negative pressure pipe 202 is used to absorb the liquid in the biochemical pool 2, thereby avoiding clogging and corrosion of the power device and improving the durability of the equipment.

[0079] As a better implementation method, Figure 7 and Figure 8 As shown, the horizontal conveyor belt 303 is connected to the first motor 3031 , and the lifting conveyor belt 304 is connected to the second motor 3041 . Both the first motor 3031 and the second motor 3041 are electrically connected to the battery 604 .

[0080] Through the above technical solution, independent motors are used to drive the two conveyor belts respectively, so that the horizontal conveyor belt 303 can run independently to stir the liquid in the sedimentation tank 3 to allow it to fully settle.

[0081] As a preferred embodiment, the upper end surface of the evaporation table 403 is a ceramic layer, the evaporation column 4031 is a brass column, and the evaporation column 4031 has a structure that is thick at the bottom and narrow at the top.

[0082] Through the above technical solution, the thermal expansion and contraction of brass and the expansion of the thermally variable capacitance body 4032 are utilized, so that each part of the evaporation column 4031 can fully scrape the ceramic layer with small thermal deformation, thereby improving the separation effect of the crystallized matter.

[0083] This embodiment also provides a method for landfill leachate membrane separation pretreatment and concentrated liquid treatment, using the above-mentioned integrated landfill leachate membrane separation pretreatment and concentrated liquid treatment equipment, and further comprising the following steps:

[0084] Step S1: Cultivating Rhizopus oryzae in the biochemical pool 2;

[0085] Step S2: injecting new landfill leachate into the biochemical pool 2, performing biochemical treatment with Rhizopus oryzae, monitoring the pH value change in the biochemical pool 2, and when the pH value drops to the minimum value and rebounds, pumping the upper layer of liquid in the biochemical pool 2 into the sedimentation tank 3;

[0086] Step S3: Sodium hydroxide is added to the sedimentation tank 3 through the dosing hole 302, and the first motor 3031 is started to drive the horizontal conveyor belt 303 to rotate and stir. After the pH change is monitored to be neutral, the second motor 3041 is started to drive the lifting conveyor belt 304 to transport the sediment to the evaporation tank 4;

[0087] Step S4: transporting the supernatant in the sedimentation tank 3 to the membrane treatment process unit for treatment and transporting the concentrated liquid generated after the membrane treatment back to the evaporation tank 4;

[0088] Step S5: The hot water pump 404 generates waste heat from the fuel cell 6 and enters the temperature-controlled water pipe 4033 to perform water-insulated evaporation and crystallization on the liquid in the evaporation pool 4. The crystals after evaporation are reused, and the condensed water generated by evaporation is collected in the condensation pool 5.

[0089] Through the above technical solution, a coordinated treatment method of pretreatment and concentrated liquid treatment is adopted, which reduces repeated dosing and repeated pH value adjustment and reduces equipment redundancy.

[0090] As a preferred embodiment, in the above step S5: hot water causes the evaporation column 4031 to rise, and crystals are formed on the outer surface of the portion of the evaporation column 4031 extending out of the evaporation table 403. After evaporation is completed, the cold water pump 404 in the condensation pool 5 enters the temperature-controlled water pipe 4033 to cause the evaporation column 4031 to sink, and the crystals on it are separated by scraping between the evaporation column 4031 and the evaporation table 403.

[0091] Through the above technical solution, the automation of crystallization separation is improved by utilizing temperature difference changes to raise and lower the evaporation column 4031.

[0092] As a preferred embodiment, the above-mentioned landfill leachate membrane separation pretreatment and concentrated liquid treatment method further includes the following steps:

[0093] Step S6: the condensed water in the condensation pool 5 is discharged into the biochemical pool 2 to increase the pH value in the biochemical pool 2.

[0094] Through the above technical solution, the by-products of the concentrated liquid treatment are fully utilized to adjust the pH value of the biochemical pool 2, thereby improving the synergy between the pretreatment and the concentrated liquid treatment.

[0095] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An integrated device for landfill leachate membrane separation pretreatment and concentrated liquid treatment, comprising a biochemical tank (2), a sedimentation tank (3), an evaporation tank (4) and a condensation tank (5), characterized in that: Also includes: A shell (1), wherein the biochemical pool (2), the sedimentation pool (3) and the evaporation pool (4) are integrally arranged in the shell (1); The biochemical pool (2) is filled with filtered landfill leachate and Rhizopus oryzae, and the upper layer of liquid in the biochemical pool (2) after the biochemical reaction of the Rhizopus oryzae is sent to the sedimentation tank; The sedimentation tank (3) is connected to a horizontal conveyor belt (303), a lifting conveyor belt (304), a dosing hole (302), and a liquid collection pipe (301). The sediment generated after the dosing through the dosing hole (302) moves from the horizontal conveyor belt (303) to the lifting conveyor belt (304), and is then lifted and sent to the evaporation tank (4). The liquid collection pipe (301) transports the clear liquid in the sedimentation tank (3) to the membrane treatment process unit. The evaporation pool (4) is connected to a second liquid inlet pipe (401) and a dust suction pipe (402); the second liquid inlet pipe (401) is connected to the membrane treatment process unit and is used to transport the concentrated liquid generated by the membrane treatment to the evaporation pool (4); the dust suction pipe (402) is used to suck out the residual crystals in the evaporation pool (4) and reuse them; The condensation pool (5) collects water evaporated from the evaporation pool (4), and the condensation pool (5) is connected to the biochemical pool (2). Water is discharged to the biochemical pool (2) through the condensation pool (5) to increase the pH value in the biochemical pool (2) to meet the survival of the Rhizopus oryzae; A fuel cell (6) is connected to the housing (1), and the fuel cell (6) is connected to an air intake pipe (601) and an air intake pipe (602), wherein the air intake pipe (601) absorbs air, and the air intake pipe (602) absorbs gas generated in the biochemical pool (2); The battery (604) is electrically connected to the fuel cell (6); The evaporation pond (4) comprises: an evaporation table (403), connected to the bottom of the evaporation pool (4); A temperature-regulating water pipe (4033) is laid in the evaporation table (403), and the temperature-regulating water pipe (4033) is connected to a water pump (404); The fuel cell (6) is a solid oxide fuel cell, a heat dissipation water pipe (603) is provided on the outer ring of the fuel cell (6), and the water pump (404) is connected to the heat dissipation water pipe (603); A plurality of evaporation columns (4031) are connected in a lifting manner inside the evaporation table (403); The thermally variable capacity body (4032) abuts against the lower end of the evaporation column (4031).

2. The integrated equipment for landfill leachate membrane separation pretreatment and concentrated liquid treatment according to claim 1, characterized in that: Also includes: The negative pressure pipe (202) is a three-way structure, with its three openings respectively arranged on the outside of the shell (1), inside the biochemical pool (2), and on the side wall of the sedimentation pool (3).

3. The integrated equipment for landfill leachate membrane separation pretreatment and concentrated liquid treatment according to claim 2, characterized in that: The horizontal conveyor belt (303) is connected to a first motor (3031) in a transmission manner, and the lifting conveyor belt (304) is connected to a second motor (3041) in a transmission manner. Both the first motor (3031) and the second motor (3041) are electrically connected to the battery (604).

4. The integrated equipment for landfill leachate membrane separation pretreatment and concentrated liquid treatment according to claim 3, characterized in that: The upper end surface of the evaporation table (403) is a ceramic layer, the evaporation column (4031) is a brass column, and the evaporation column (4031) has a structure that is thick at the bottom and narrow at the top.

5. A method for membrane separation pretreatment of landfill leachate and concentrated liquid treatment, characterized in that: The integrated equipment for landfill leachate membrane separation pretreatment and concentrated liquid treatment according to claim 4 further comprises the following steps: Step S1: Cultivating Rhizopus oryzae in the biochemical pool (2); Step S2: injecting new leachate into the biochemical pool (2), performing biochemical treatment with Rhizopus oryzae, monitoring the pH value change in the biochemical pool (2), and when the pH value drops to the lowest value and rebounds, pumping the upper layer of liquid in the biochemical pool (2) into the sedimentation pool (3); Step S3: Sodium hydroxide is added into the sedimentation tank (3) through the dosing hole (302), and the first motor (3031) is started to drive the horizontal conveyor belt (303) to rotate and stir. After the pH change is monitored and it is neutral, the second motor (3041) is started to drive the lifting conveyor belt (304) to transport the precipitate to the evaporation tank (4); Step S4: transporting the supernatant in the sedimentation tank (3) to the membrane treatment process unit for treatment and transporting the concentrated liquid generated after the membrane treatment back to the evaporation tank (4); Step S5: hot water generated by waste heat from the fuel cell (6) is pumped into the temperature-controlled water pipe (4033) to perform water-insulated evaporation and crystallization on the liquid in the evaporation pool (4), the evaporated crystals are reused, and the condensed water generated by the evaporation is collected in the condensation pool (5).

6. The method for membrane separation pretreatment of landfill leachate and concentrated liquid treatment according to claim 5, characterized in that: In step S5, the hot water causes the evaporation column (4031) to rise, and crystals are formed on the outer surface of the portion of the evaporation column (4031) extending from the evaporation table (403). After evaporation is completed, cold water in the condensation pool (5) is pumped into the temperature-controlled water pipe (4033) to cause the evaporation column (4031) to sink, and the crystals on the evaporation column (4031) are separated by the scraping and separation effect between the evaporation column (4031) and the evaporation table (403).

7. The method for membrane separation pretreatment of landfill leachate and concentrated liquid treatment according to claim 6, characterized in that: The following steps are also included: Step S6: The condensed water in the condensation pool (5) is discharged into the biochemical pool (2) to increase the pH value in the biochemical pool.

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