Degradation device and degradation method for high-nitrogen landfill leachate

Abstract

The application relates to a high-nitrogen garbage leachate degradation device, which comprises two connected sequencing batch anaerobic reactors, and reactor water inlet pipes and reactor sludge inlet pipes are respectively connected to the lower parts of the anaerobic reactors, and belongs to the technical field of water treatment equipment. The device is characterized in that the upper end of the anaerobic sequencing batch reactor is provided with an electrodeionization device which is composed of five compartments, i.e. an anode chamber, a first concentrated water chamber, a fresh water chamber, a second concentrated water chamber and a cathode chamber. The fresh water chamber is communicated with the reactor and is filled with mixed cation and anion exchange resins in a ratio of 1:1. The garbage leachate enters the fresh water chamber from the lower end of the reactor. The device fully utilizes the anaerobic biological treatment method and the electrodeionization technology, is energy-saving and environment-friendly, can effectively remove ammonia nitrogen and COD in the high-nitrogen garbage leachate, does not need frequent shutdown and cleaning, can be operated for a long time, and meets the environmental protection requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment equipment, in particular to a degradation device and degradation method of high-nitrogen landfill leachate. BACKGROUND

[0002] More than half of the municipal solid waste in China is landfilled, and landfill process is easy to produce landfill leachate, causing secondary pollution. Landfill leachate has the characteristics of high COD and high ammonia nitrogen, especially ammonia nitrogen which is extremely easy to cause water eutrophication, and is harmful to human and natural environment. Electrodeionization technology (EDI) and anaerobic activated sludge method can effectively degrade COD and ammonia nitrogen.

[0003] The existing technology electrodeionization technology (EDI) and anaerobic biological treatment method has complex equipment and device structure, difficult maintenance, high operation cost, and needs frequent cleaning, which is not conducive to long-time treatment of landfill leachate. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a degradation device and degradation method of high-nitrogen landfill leachate, which solves the problems of complex equipment and device structure, difficult maintenance and high operation cost of the existing electrodeionization technology and traditional anaerobic activated sludge method.

[0005] To achieve the above object, the present application is realized by the following technical scheme: a degradation device of high-nitrogen landfill leachate, comprising two connected sequencing batch anaerobic reactors, a reactor water inlet pipe and a reactor sludge inlet pipe are respectively communicated below the anaerobic reactors, the top of the two anaerobic reactors is sealed by a cover plate and is air-tight, a partition plate is fixed in the middle of the two anaerobic reactors to separate the upper and lower spaces, the space above the partition plate is sequentially separated from left to right into an anode chamber, a first concentrated water chamber, a fresh water chamber, a second concentrated water chamber and a cathode chamber by alternately arranging a cation exchange membrane and an anion exchange membrane, a porous filter plate is arranged in the inner cavity of the partition plate below the fresh water chamber, so that the landfill leachate can be introduced into the fresh water chamber from below the reactor;

[0006] A titanium-ruthenium anode electrode is fixedly connected in the inner cavity of the anode chamber, a stainless steel cathode electrode is fixedly connected in the inner cavity of the cathode chamber, the titanium-ruthenium anode electrode and the stainless steel cathode electrode are respectively connected with the positive and negative poles of a power supply, the external power supply power is 20V and 0.6A, the inner cavity of the fresh water chamber is filled with mixed cation and anion exchange resin, the anode chamber and the cathode chamber are communicated with a chamber water inlet pipe, the first concentrated water chamber and the second concentrated water chamber are respectively communicated with a concentrated water chamber water inlet pipe above and a concentrated water chamber water outlet pipe below, the lower part of the porous filter plate is communicated with a leachate water inlet pipe, the concentrated water chamber water outlet pipe is communicated with a concentrated water tank, and the leachate water inlet pipe is communicated with a fresh water tank.

[0007] As a further scheme of the present application: electromagnetic stirrers are arranged in the inner cavities below the baffles.

[0008] As a further scheme of the present application: the filling ratio of the mixed cation and anion exchange resin is 1:1.

[0009] As a further scheme of the present application: the two anaerobic reactors are connected through sludge connection pipes.

[0010] As a further scheme of the present application: the water inlet pipes of the degradation devices are connected with peristaltic pumps, and electromagnetic valves are arranged in the pipes.

[0011] As a further scheme of the present application: 2% Na2SO4 solution is filled in the anode chamber and the cathode chamber.

[0012] The present application further discloses a degradation method of the degradation device of the high-nitrogen landfill leachate.

[0013] Step one, anaerobic activated sludge is introduced into the anaerobic reactor through the reactor sludge inlet pipe, and the landfill leachate is introduced into the anaerobic reactor through the water inlet of the freshwater tank, the landfill leachate and the anaerobic activated sludge are mixed together under the stirring of the electromagnetic stirrer, and the organic matter is degraded, the electromagnetic stirrer is controlled by the time control switch, the rotating speed is kept at 140 r / min, the stirring frequency is 5 min / 2 h, and then the landfill leachate is continuously input, the water surface continuously rises, the landfill leachate enters the freshwater chamber through the porous filter plate at a water inlet rate of 2 ml / min, the mixed cation and anion exchange resin in the freshwater chamber is first soaked in the landfill leachate for 15 min, and then the landfill leachate penetrates to both sides and is electrolyzed through the electrodes on both sides.

[0014] Step two, the degraded deionized water is pumped into the first concentrated water chamber and the second concentrated water chamber through the peristaltic pump, and then is input into the concentrated water tank.

[0015] As a further scheme of the present application: the ratio of the landfill leachate and the anaerobic activated sludge in step one is 1:1.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The upper end of the anaerobic sequencing batch reactor is provided with an electrodeionization device, which is composed of an anode chamber, a first concentrated water chamber, a fresh water chamber, a second concentrated water chamber and a cathode chamber, the fresh water chamber is communicated with the reactor and is filled with mixed cation and anion exchange resins in a ratio of 1:1, the landfill leachate enters the fresh water chamber from the lower end of the reactor, and is separated by electrolysis after penetrating step by step from bottom to top, the energy saving and environmental protection can be realized by fully utilizing the anaerobic biological treatment method and the electrodeionization technology, the ammonia nitrogen and COD in the high-nitrogen landfill leachate can be effectively removed, frequent shutdown and cleaning are not needed, long-term operation can be realized, and the environmental protection requirement is met. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present application.

[0019] In the figure: 1, power supply; 2, mixed cation and anion exchange resins; 3, concentrated water chamber water inlet pipe; 4, electrode chamber water inlet pipe; 5, titanium-coated ruthenium anode electrode; 6, reactor water inlet pipe; 7, reactor sludge inlet pipe; 8, electromagnetic stirrer; 9, sludge connecting pipe; 10, concentrated water tank; 11, fresh water tank; 12, leachate water inlet pipe; 13, stainless steel cathode electrode; 14, cation exchange membrane; 15, anion exchange membrane; 16, partition plate; 17, porous filter plate; 18, concentrated water chamber water outlet pipe; 20, anode chamber; 21, first concentrated water chamber; 22, fresh water chamber; 23, second concentrated water chamber; 24, cathode chamber; 25, anaerobic reactor. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0021] Please refer to Figure 1 The present application provides a technical solution: a high-nitrogen landfill leachate degradation device, which comprises two connected sequencing batch anaerobic reactors 25, the lower part of each anaerobic reactor 25 is respectively communicated with a reactor water inlet pipe 6 and a reactor sludge inlet pipe 7, the top part of each anaerobic reactor 25 is sealed by a cover plate and is air-tight, a partition plate 16 is fixed in the middle part of each anaerobic reactor 25 to separate the upper and lower spaces, the space above the partition plate 16 of each anaerobic reactor 25 is sequentially separated from left to right into an anode chamber 20, a first concentrated water chamber 21, a fresh water chamber 22, a second concentrated water chamber 23 and a cathode chamber 24 by alternately arranging a cation exchange membrane 14 and an anion exchange membrane 15, and a porous filter plate 17 is arranged in the inner cavity of the partition plate 16 below the fresh water chamber 22, so that the landfill leachate can be introduced into the fresh water chamber 22 from the lower part of the reactor;

[0022] The inner cavity of the anode chamber 20 is fixedly connected with a titanium-coated ruthenium anode 5, and the inner cavity of the cathode chamber 24 is fixedly connected with a stainless steel cathode 13; the titanium-coated ruthenium anode 5 and the stainless steel cathode 13 are connected with the positive and negative poles of a power supply 1 respectively; the power of the power supply 1 is 20V and 0.6A; the inner cavity of the fresh water chamber 22 is filled with mixed cation and anion exchange resin 2; the anode chamber 20 and the cathode chamber 24 are both communicated with anode chamber water inlet pipes 4; the first concentrated water chamber 21 and the second concentrated water chamber 23 are both communicated with a concentrated water chamber water inlet pipe 3 located at the upper side and a concentrated water chamber water outlet pipe 18 located at the lower side; the lower side of the porous filter plate 17 is communicated with a percolate water inlet pipe 12; the concentrated water chamber water outlet pipe 18 is communicated with a concentrated water tank 10; and the percolate water inlet pipe 12 is communicated with a fresh water tank 11.

[0023] The two anaerobic reactors 25 located at the inner cavity below the partition plate 16 are both provided with electromagnetic stirrers 8.

[0024] The filling ratio of the mixed cation and anion exchange resin 2 is 1:1.

[0025] The lower sides of the two anaerobic reactors 25 are communicated through sludge connection pipes 9.

[0026] The water inlet pipes of the degradation device are all connected with peristaltic pumps, and the pipes are all provided with electromagnetic valves.

[0027] The anode chamber 20 and the cathode chamber 24 are both filled with 2% Na2SO4 solution.

[0028] The application further discloses a degradation method of the degradation device of the high-nitrogen landfill leachate.

[0029] Step one: anaerobic active sludge is introduced into the anaerobic reactor 25 through the reactor sludge inlet pipe 7, and the landfill leachate is introduced into the anaerobic reactor 25 through the water inlet of the fresh water tank 11; the landfill leachate and the anaerobic active sludge are fully mixed under the stirring of the electromagnetic stirrer 8 to degrade the organic matter; the electromagnetic stirrer 8 is controlled by a time control switch, and the rotation speed is maintained at 140r / min, and the stirring frequency is 5min / 2h intermittent uniform stirring; then the landfill leachate is continuously introduced, the water surface continuously rises, and the landfill leachate enters the fresh water chamber 22 through the porous filter plate 17 at a water inlet rate of 2ml / min; the mixed cation and anion exchange resin 2 in the fresh water chamber is first soaked in the landfill leachate for 15min, and then the landfill leachate penetrates to both sides to be electrolyzed by the electrodes on both sides.

[0030] Step two: the deionized water after degradation is pumped into the first concentrated water chamber 21 and the second concentrated water chamber 23 by the peristaltic pump, and then is introduced into the concentrated water tank 10.

[0031] The ratio of the landfill leachate and the anaerobic active sludge in step one is 1:1.

[0032] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A device for degrading high-nitrogen landfill leachate, comprising two anaerobic reactors (25) connected together, a reactor water inlet pipe (6) and a reactor sludge inlet pipe (7) respectively communicating with the lower part of the anaerobic reactors (25), characterized in that: The top of each of the two anaerobic reactors (25) is sealed by a cover plate, and the middle of each of the two anaerobic reactors (25) is fixed with a partition plate (16) for separating the upper and lower spaces, and the space above the partition plate (16) is sequentially separated into an anode chamber (20), a first concentrated water chamber (21), a fresh water chamber (22), a second concentrated water chamber (23) and a cathode chamber (24) from left to right by alternately arranged cation exchange membranes (14) and anion exchange membranes (15). The inner cavity of the anode chamber (20) is fixedly connected with a titanium-coated ruthenium anode (5), and the inner cavity of the cathode chamber (24) is fixedly connected with a stainless steel cathode (13), the titanium-coated ruthenium anode (5) and the stainless steel cathode (13) are respectively connected with the positive and negative poles of a power supply (1), the inner cavity of the fresh water chamber (22) is filled with mixed cation and anion exchange resin (2), the anode chamber (20) and the cathode chamber (24) are both communicated with a chamber water inlet pipe (4), the first concentrated water chamber (21) and the second concentrated water chamber (23) are both communicated with a concentrated water chamber water inlet pipe (3) located above and a concentrated water chamber water outlet pipe (18) located below, the lower part of the porous filter plate (17) is communicated with a leachate water inlet pipe (12), the concentrated water chamber water outlet pipe (18) is communicated with a concentrated water tank (10), and the leachate water inlet pipe (12) is communicated with a fresh water tank (11).

2. The device for degrading high-nitrogen landfill leachate according to claim 1, characterized in that: The inner cavities below the partition plate (16) of the two anaerobic reactors (25) are both provided with electromagnetic stirrers (8).

3. The device for degrading high-nitrogen landfill leachate according to claim 1, characterized in that: The filling ratio of the mixed cation and anion exchange resin (2) is 1:

1.

4. The device for degrading high-nitrogen landfill leachate according to claim 1, characterized in that: The lower parts of the two anaerobic reactors (25) are communicated through a sludge connection pipe (9).

5. The device for degrading high-nitrogen landfill leachate according to claim 1, characterized in that: The water inlet pipes of the degradation device are all connected with peristaltic pumps, and the pipes are all provided with electromagnetic valves.

6. The device for degrading high-nitrogen landfill leachate according to claim 1, characterized in that: 2% Na2SO4 solution is filled in the anode chamber (20) and the cathode chamber (24).

7. The degradation method of the device for degrading high-nitrogen landfill leachate according to any one of claims 1-6, characterized in that: The method comprises the following steps: Step one: anaerobic activated sludge is introduced into the anaerobic reactor (25) through a reactor sludge inlet pipe (7), and landfill leachate is introduced into the anaerobic reactor (25) through a water inlet of a fresh water tank (11), the landfill leachate and the anaerobic activated sludge are mixed under the stirring of an electromagnetic stirrer (8) to degrade organic matter, the water surface continuously rises, the landfill leachate enters the fresh water chamber (22) through the porous filter plate (17) at a water inlet rate of 2 mL / min, the mixed cation and anion exchange resin (2) in the fresh water chamber is fully soaked with the landfill leachate for 15 minutes, and then the landfill leachate penetrates to both sides to be electrolyzed by the electrodes on both sides; Step two: deionized water after degradation is pumped into the first concentrated water chamber (21) and the second concentrated water chamber (23) through a peristaltic pump, and then is input into a concentrated water tank (10).

8. The degradation method of the high-nitrogen landfill leachate degradation device according to claim 7, characterized in that: The ratio of the landfill leachate to the anaerobic activated sludge in step one is 1:1.

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