Humic acid extraction equipment

Abstract

The utility model relates to humic acid extraction equipment which comprises a raw water tank, a first homogeneous reaction tank, a first solid-liquid separator, a second homogeneous reaction tank and a second solid-liquid separator, an organic nanofiltration membrane is arranged in the raw water tank, and the second solid-liquid separator is provided with a return pump. And the return pump is used for conveying the leachate obtained after the refractory substances are separated to the front end again for biochemical treatment. The method comprises the following steps: pumping leachate concentrated water into a raw water tank, pressing water molecules and monovalent ions in the leachate concentrated water through an organic nanofiltration membrane to enter a water production side of the raw water tank by virtue of selective permeability of the organic nanofiltration membrane, then precipitating a concentrated solution in a first homogeneous reaction tank, separating humic acid in a first solid-liquid separator, and separating humic acid in a second solid-liquid separator; and after residual refractory organic matters are precipitated and separated in the second homogeneous reaction tank and the second solid-liquid separator, the solution separated for the second time is conveyed to the front-end biochemical treatment again, so that the treatment difficulty during the front-end biochemical treatment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of waste treatment equipment, in particular to a humic acid extraction equipment. BACKGROUND

[0002] In the domestic waste landfill site, the organic matter content in the leachate concentrated water is too high, using the membrane system to process in the way of high pressure reverse osmosis will cause the membrane system to be easily blocked, and the organic matter content in the treated filtrate is too high, which will affect the evaporator during subsequent treatment, and the organic matter will affect the boiling point when the filtrate is evaporated, which will reduce the processing efficiency of the evaporator.

[0003] After research, it is found that the leachate concentrated water generated by the biochemical process at the front end of the domestic waste landfill site is a high-concentration organic wastewater with high COD and high salt content, and the remaining organic matter in the water is usually difficult to degrade humic acid. Extracting or separating this part of the material can greatly reduce the treatment difficulty of the wastewater. In view of this situation, the present application designs a device for extracting humic acid from leachate concentrated water to reduce the treatment difficulty of the leachate concentrated water generated by the domestic waste landfill site. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem that the leachate concentrated water generated by the biochemical process at the front end of the domestic waste landfill site is difficult to treat directly, the present application provides a humic acid extraction equipment.

[0005] The humic acid extraction equipment provided by the present application adopts the following technical scheme:

[0006] A humic acid extraction equipment, comprising a raw water tank, a first homogenization reaction tank, a first solid-liquid separator, a second homogenization reaction tank and a second solid-liquid separator, the raw water tank is provided with an organic nanofiltration membrane for preliminary filtration of leachate concentrated water, the first homogenization reaction tank is used for precipitating humic acid in the leachate concentrated water, the first solid-liquid separator is used for separating humic acid precipitate, the second homogenization reactor and the second solid-liquid separator are used for precipitating and separating the remaining refractory substances in the filtrate, and the second solid-liquid separator is provided with a return pump, the return pump is used for retransporting the leachate after the refractory substances are separated to the front end for biochemical treatment.

[0007] Through the technical scheme, the leachate concentrated water is first pumped into the raw water tank, water molecules and monovalent ions in the leachate concentrated water are pressed through the selective permeability of the organic nanofiltration membrane into the water production side of the raw water tank, then the concentrated solution is precipitated in the first homogeneous reaction tank, humic acid is separated in the first solid-liquid separator, then the remaining refractory organic matter is precipitated and separated in the second homogeneous reaction tank and the second solid-liquid separator, and the second separated solution is re-delivered to the front end biochemical treatment, thereby reducing the treatment difficulty of the front end biochemical treatment.

[0008] Optionally, the first homogeneous reaction tank comprises a tank body, a first feeding device for adding a PH regulator arranged on the tank body, and a second feeding device for adding a coagulant arranged on the tank body, the first feeding device comprises a first metering pump and a pH detector arranged on the tank body, the metering pump is used for supplying the PH regulator according to the detection value of the pH detector, and the second feeding device comprises a second metering pump and a turbidity detector arranged on the tank body, the second metering pump is used for adding the coagulant in the tank body according to the detection signal of the turbidity detector.

[0009] Optionally, the tank body is provided with a temporary storage barrel connected with the second metering pump and an adding mechanism for adding the coagulant in the tank body, the adding mechanism comprises a plurality of spray pipes uniformly arranged above the tank body, a plurality of spray holes are uniformly arranged below the spray pipes, a control valve is arranged on the bottom wall of the temporary storage barrel, and the spray pipes are connected with the control valve.

[0010] Optionally, a pressing plate is slidably arranged in the temporary storage barrel, the pressing plate is in sealing sliding fit with the inner wall of the temporary storage barrel, an elastic water bag is arranged on the top wall of the pressing plate, a water tank is arranged on the side wall of the top of the temporary storage barrel, a baffle is arranged on the top wall of the temporary storage barrel, the baffle is used for blocking the rising of the elastic water bag, and the water tank supplies water to the elastic water bag through a transmission member.

[0011] Optionally, the transmission member comprises a hose, and the two ends of the hose are respectively immersed in water in the elastic water bag and the water tank.

[0012] Optionally, a stirring pump is arranged in the tank body, the feeding end of the stirring pump is connected with the bottom of the tank body through a pipeline, and the discharging end of the stirring pump is higher than the liquid level of the tank body.

[0013] Optionally, a plurality of feeding pipes are uniformly arranged on the bottom of the tank body, a plurality of feeding holes are arranged on the feeding pipes, and the feeding pipes are connected with the feeding end of the stirring pump.

[0014] Optionally, the feeding pipe is provided with a plurality of suction pipes corresponding to the feeding holes and communicating with the feeding holes, the suction pipes are located on both sides of the feeding pipe, the lower end of the suction pipe is in an open shape, and a suction hole is formed through the side wall of the lower end of the suction pipe and communicates with the opening of the suction pipe.

[0015] Optionally, the first homogenization reaction tank and the first solid-liquid separator are connected through a conveying pipeline, and a pH regulator is added in the conveying pipeline to adjust the pH value of the sludge-water mixture.

[0016] Optionally, a plurality of feeding pipes are arranged on the conveying pipeline at intervals along the length direction of the conveying pipeline, the feeding pipes are used for conveying the pH regulator into the conveying pipeline, and a one-way valve is arranged at the connection between the feeding pipe and the conveying pipeline.

[0017] In summary, the concentrated leachate is filtered by the organic nanofiltration membrane, then the concentrated leachate is adjusted to be acidic by adding a pH regulator, and then the sludge-water mixture is coagulated and precipitated, the pH value of the sludge-water mixture is adjusted to be weakly acidic, and then the humic acid is separated from the sludge-water mixture in the first solid-liquid separator, so that the difficulty of recycling the remaining solution to the front end of the biochemical treatment is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the connection of parts of the present application.

[0019] Figure 2 is a schematic diagram of the three-dimensional structure of the first homogenization reaction tank of the present application.

[0020] Figure 3 is a sectional view of the feeding pipe of the present application.

[0021] Figure 4 is a sectional view of the temporary storage box of the present application.

[0022] Those skilled in the art will understand that the elements in the drawings are shown for simplicity and clarity, and are not necessarily drawn to scale. For example, the dimensions and positions of some of the elements in the drawings can be exaggerated relative to other elements to help improve understanding of the present embodiments.

[0023] Reference signs: 1, raw water tank; 2, first homogenization reaction tank; 21, tank body; 4, second homogenization reaction tank; 6, first feeding device; 61, pH detector; 62, first metering pump; 7, second feeding device; 71, second metering pump; 72, turbidity detector; 8, temporary storage barrel; 81, control valve; 82, pressing plate; 83, telescopic water bag; 84, water tank; 85, hose; 86, baffle; 9, adding mechanism; 91, spraying pipe; 92, support; 93, spraying hole; 10, stirring pump; 101, feeding pipe; 1011, feeding hole; 102, discharging pipe; 103, suction pipe; 1031, suction hole. Embodiments

[0024] The following will be described in detail with reference to the accompanying drawings. Figure 1 Figure 4 The present application will be further described in detail.

[0025] The present application discloses a humic acid extraction device, referring to Figure 1 , including a raw water tank 1 for receiving the concentrated leachate from the biochemical output of the domestic waste landfill site, a first homogenization reaction tank 2 located on one side of the raw water tank 1, a first solid-liquid separator located on one side of the first homogenization reaction tank 2, a second homogenization reaction tank 4 located on one side of the first solid-liquid separator, and a second solid-liquid separator located on one side of the second homogenization reaction tank 4.

[0026] Referring to Figure 1 , the organic nanofiltration membrane is fixedly installed in the raw water tank 1, the concentrated leachate entering the raw water tank 1 passes through the organic nanofiltration membrane by selective permeability, the water molecules and monovalent ions in the concentrated leachate pass through the organic nanofiltration membrane under high pressure to the water production side of the raw water tank 1, and the water quality of the water production side meets the standard and is directly discharged, if the water quality is detected to be unqualified, the concentrated leachate is continuously conveyed to the front end for biochemical treatment of the easily degradable organic matter in the water.

[0027] Referring to Figure 1 , the remaining organic matter and divalent ions in the concentrated leachate are intercepted by the organic nanofiltration membrane and are concentrated to the concentrated water side of the raw water tank 1, at this time, the concentrated leachate has been reduced by one time, and the amount of the concentrated leachate to be treated is reduced to 20% to 25% of the original total amount.

[0028] Referring to Figure 2 , the concentrated concentrated leachate is extracted and sent into the first homogenization reaction tank 2, the first homogenization reaction tank 2 includes a tank body 21 for receiving wastewater, a first feeding device 6 and a second feeding device 7 arranged on the tank body 21. The first feeding device 6 is used to adjust the pH value in the tank body 21, and the second feeding device 7 is used to add a coagulant special for humic acid into the tank body 21.

[0029] Referring to Figure 2 ​The first feeding device 6 comprises a first metering pump 62 fixedly installed on the pool body 21 and a pH detector 61 fixedly installed on the pool body 21, the first metering pump 62 is controlled through the pH detector 61, the first metering pump 62 is used for adding a PH regulator in the pool body 21, according to the detection of the pH detector 61, the first metering pump 62 transports the PH regulator in the pool body 21 until the pH value of the solution in the pool body 21 reaches between 1.5-2.0.

[0030] Referring to Figure 2 and Figure 4 The stirring pump 10 is fixedly installed in the pool body 21, a plurality of feeding pipes 101 are fixedly installed on the lower side of the pool body 21, the feeding pipes 101 are uniformly distributed on the bottom of the pool body 21, and the feeding pipes 101 are fixedly connected with the feeding end of the stirring pump 10. A plurality of feeding holes 1011 are formed on the two sides of the feeding pipe 101, the feeding holes 1011 are spaced apart along the length direction of the feeding pipe 101, a plurality of suction pipes 103 are fixedly installed on the two sides of the feeding pipe 101, the suction pipes 103 correspond to the feeding holes 1011 one by one, the lower end of the suction pipe 103 abuts against the bottom wall of the pool body 21 to support the feeding pipe 101, and meanwhile, a suction hole 1031 is formed through the lower end side wall of the suction pipe 103, the suction hole 1031 is in communication with the port of the lower end of the suction pipe 103, and the stirring pump 10 sucks the solution at the bottom of the pool body 21 through the suction hole 1031 of the suction pipe 103 and the port of the lower end of the suction pipe 103. The discharging end of the stirring pump 10 re-transport the mixed solution to the pool body 21 through the discharging pipe 102, and the discharging end of the discharging pipe 102 is higher than the liquid level in the pool body 21.

[0031] Referring to Figure 2 The detection end of the pH detector 61 is located at the discharging end of the discharging pipe 102, so that the pH value of the mixed solution in the pool body 21 can be more accurately detected.

[0032] Referring to Figure 2 and Figure 3 The second feeding device 7 comprises a temporary storage barrel 8 fixedly installed on the pool body 21, a second metering pump 71 fixedly installed on the temporary storage barrel 8 and connected with the temporary storage barrel 8, an adding mechanism 9 arranged on the pool body 21, and a turbidity detector 72 fixedly installed on the pool body 21 and used for detecting the turbidity of the solution in the pool body 21, the second metering pump 71 is controlled through the turbidity detector 72, and according to the detection result of the turbidity detector 72, a corresponding amount of coagulant is input into the temporary storage barrel 8 and then closed.

[0033] Referring to Figure 2 and Figure 3The adding mechanism 9 comprises a plurality of spraying pipes 91 fixedly installed above the pool body 21 through the support 92, a plurality of spraying holes 93 evenly arranged on the lower side wall of the spraying pipe 91, a control valve 81 fixedly installed at the bottom of the temporary storage barrel 8, and the spraying pipe 91 is fixedly connected to the control valve 81.

[0034] Referring to Figure 2 and Figure 3 A pressing plate 82 is slidably installed in the temporary storage box, and the pressing plate 82 is used to provide flow pressure to the coagulant in the temporary storage box. A telescopic water bag 83 is fixedly installed on the top wall of the pressing plate 82. A water tank 84 is fixedly installed on the side wall of the temporary storage box. The water tank 84 and the telescopic water bag 83 are connected through a hose 85. One end of the hose 85 is inserted into the bottom of the water tank 84, and the other end of the hose 85 is inserted into the telescopic water bag 83 and fixedly connected to the telescopic water bag 83.

[0035] Referring to Figure 2 and Figure 3 The two ends of the hose 85 are respectively immersed in the water in the telescopic water bag 83 and the water tank 84. The baffle 86 is sealingly and slidably connected between the baffle 86 and the temporary storage box. The baffle 86 is fixedly installed at the upper opening of the temporary storage box. The hose 85 slides through the baffle 86.

[0036] Since the coagulant needs to be continuously and uniformly added to the pool body 21, and needs to be uniformly added to the entire pool body 21, a sufficient amount of coagulant is first injected into the temporary storage box, and then the coagulant is uniformly dripped into the pool body 21 through the cooperation between the temporary storage box and the spraying pipe 91.

[0037] Since the output water pressure of the coagulant decreases as the liquid level in the temporary storage box decreases, and the water tank 84 delivers water to the telescopic water tank 84 through the hose 85 through the siphon effect as the baffle 86 descends, the gravity of the pressing plate 82 and the telescopic water tank 84 is increased, and the lost water pressure is provided through the baffle 86 and the telescopic water bag 83, so that the coagulant maintains a relatively uniform dripping speed from the beginning of dripping to the end of dripping.

[0038] When the temporary storage box is filled with coagulant, the pressing plate 82 rises, and the telescopic water bag 83 re-presses the water into the water tank 84 through the extrusion of the baffle 86.

[0039] After 2-3 hours of precipitation in the first homogeneous reaction pool 2, the mud-water mixture at the bottom of the pool is transported to the first solid-liquid separator through the conveying pipeline.

[0040] The conveying pipeline is provided with a plurality of feeding pipes 101 at intervals along the length direction of the conveying pipeline, the feeding pipes 101 are used for conveying the pH value adjusting agent into the conveying pipeline, and the connection between the feeding pipes 101 and the conveying pipeline is provided with a one-way valve. The pH value of the sludge-water mixture deposited at the bottom of the first homogenizing reaction tank 2 is adjusted to 4-5 by the pH value adjusting agent, the extraction of humic acid by the first solid-liquid separator is promoted, and the corrosion of the equipment and pipeline by the sludge-water mixture is reduced.

[0041] After the solid-liquid separation in the first solid-liquid separator, the separated humic acid is collected, and the separated solution is extracted into the second homogenizing reaction tank 4, the pH value adjusting agent and the coagulant are added into the second homogenizing reaction tank 4 by the metering pump, the remaining refractory organic matter in the solution is neutralized and then precipitated, the sludge-water mixture at the bottom is pumped to the second solid-liquid separator for solid-liquid separation, the separated sludge is collected, and the separated solution is conveyed to the front-end biochemical treatment.

[0042] The above are the preferred embodiments of the present application, and are not used to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A humic acid extraction apparatus, characterized by: The device comprises a raw water tank (1), a first homogenizing reaction tank (2), a first solid-liquid separator, a second homogenizing reaction tank (4) and a second solid-liquid separator, the raw water tank (1) is provided with an organic nanofiltration membrane for preliminary filtration of leachate concentrated water, the first homogenizing reaction tank (2) is used for precipitating humic acid in the leachate concentrated water, the first solid-liquid separator is used for separating humic acid precipitate, the second homogenizing reaction tank (4) and the second solid-liquid separator are used for precipitating and separating remaining refractory substances in the filtrate, and the second solid-liquid separator is provided with a return pump for re-transporting the leachate after the refractory substances are separated to the front end for biochemical treatment.

2. A humic acid extraction apparatus according to claim 1, characterized in that: The first homogenizing reaction tank (2) comprises a tank body (21), a first feeding device (6) provided on the tank body (21) for adding a PH regulator and a second feeding device (7) provided on the tank body (21) for adding a coagulant, the first feeding device (6) comprises a first metering pump (62) and a pH detector (61) provided on the tank body (21), the metering pump is used for supplying the PH regulator according to the detection value of the pH detector (61), and the second feeding device (7) comprises a second metering pump (71) and a turbidity detector (72) provided on the tank body (21), the second metering pump (71) is used for adding the coagulant in the tank body (21) according to the detection signal of the turbidity detector (72).

3. A humic acid extraction apparatus according to claim 2, characterised in that: The tank body (21) is provided with a temporary storage barrel (8) connected with the second metering pump (71) and an adding mechanism (9) for adding the coagulant to the tank body (21), the adding mechanism (9) comprises a plurality of spray pipes (91) uniformly distributed above the tank body (21), a plurality of spray holes (93) are uniformly distributed below the spray pipes (91), a control valve (81) is arranged on the bottom wall of the temporary storage barrel (8), and the spray pipes (91) are connected with the control valve (81).

4. A humic acid extraction apparatus according to claim 3, characterised in that: A pressing plate (82) is slidably arranged in the temporary storage barrel (8), the pressing plate (82) is in sealing sliding fit with the inner wall of the temporary storage barrel (8), an extendable water bag (83) is arranged on the top wall of the pressing plate (82), a water tank (84) is arranged on the side wall of the top of the temporary storage barrel (8), a baffle (86) is arranged on the top wall of the temporary storage barrel (8), the baffle (86) is used for blocking the rising of the extendable water bag (83), and the water tank (84) is used for supplying water to the extendable water bag (83).

5. A humic acid extraction apparatus according to claim 4, characterised in that: The water tank (84) and the extendable water bag (83) are connected through a hose (85), and the two ends of the hose (85) are respectively immersed in water in the extendable water bag (83) and the water tank (84).

6. A humic acid extraction apparatus according to claim 2, characterized in that: A stirring pump (10) is arranged in the tank body (21), the feeding end of the stirring pump (10) is connected with the bottom of the tank body (21) through a pipeline, and the discharging end of the stirring pump (10) is higher than the liquid level of the tank body (21).

7. A humic acid extraction apparatus according to claim 6, characterised in that: The bottom of the pool body (21) is uniformly provided with a plurality of feeding pipes (101), a plurality of feeding holes (1011) are formed in the feeding pipes (101), and the feeding pipes (101) are connected with the feeding end of the stirring pump (10).

8. A humic acid extraction apparatus according to claim 7, characterised in that: A plurality of suction pipes (103) corresponding to the feeding holes (1011) are arranged on the feeding pipes (101), the suction pipes (103) are arranged on both sides of the feeding pipes (101), the lower end of the suction pipe (103) is in an open shape, a suction hole (1031) is formed in the lower end side wall of the suction pipe (103) and communicates with the opening of the suction pipe (103).

9. The humic acid extraction apparatus according to claim 1, characterized by: The first homogenization reaction pool (2) and the first solid-liquid separator are connected through a conveying pipeline, and a pH value regulator is added in the conveying pipeline to adjust the pH value of the sludge-water mixture.

10. A humic acid extraction apparatus according to claim 9, characterised in that: A plurality of product feeding pipes (101) are arranged on the conveying pipeline along the length direction of the conveying pipeline, the feeding pipes (101) are used for conveying the pH value regulator in the conveying pipeline, and a one-way valve is arranged at the connection position of the feeding pipe (101) and the conveying pipeline.

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