Novel separation pretreatment device and method for landfill leachate

Abstract

The invention discloses a novel separation pretreatment device for landfill leachate, which comprises a first sedimentation tank (1), a second sedimentation tank (2), a butterfly pipe type nanofiltration system (3), a third sedimentation tank (4), a water recovery system (5), a liquid treatment device (6) and a solid treatment device (7), and the novel separation pretreatment method for the landfill leachate comprises the following steps: S1, first sedimentation treatment; s2, carrying out first pH regulation; s3, carrying out butterfly pipe type nanofiltration; s4, adjusting the pH value for the second time; and S5, classified recovery. According to the novel separation pretreatment device and method for the landfill leachate, the landfill leachate can be effectively pretreated and classified, and convenience is provided for subsequent treatment of waste liquid and solid waste.

Description

Technical Field

[0001] The invention relates to the technical field of garbage treatment, and in particular to a novel separation pretreatment device and method for garbage leachate. Background Art

[0002] Leachate refers to high-concentration, high-salt organic wastewater formed by the moisture contained in the garbage in the landfill, rainwater, snow and other moisture entering the landfill after a long period of fermentation, corrosion, dissolution and other processes. Due to continuous fermentation and mineralization, the nitrogen-containing components will continue to accumulate and increase, the organic components will continue to decompose and the biodegradability will decrease, the salt will continue to dissolve and precipitate, and the sulfate will continue to be reduced to sulfide. In order to improve the treatment efficiency during its treatment process, pretreatment is often required.

[0003] Application number CN201911128944.6 discloses a method for treating landfill leachate, which includes bacterial culture and landfill leachate treatment. The landfill leachate treatment method uses a bacterial culture machine to culture landfill leachate treatment bacteria in leachate with biological enzymes, and adds the cultured landfill leachate treatment bacteria to the landfill leachate to be treated, so as to degrade high-concentration organic matter, high ammonia nitrogen, COD, BOD, and SS in the landfill leachate to be treated. The treated landfill leachate can meet the national standard for Class III sewage discharged into the urban pipe network; during the entire treatment process, no chemical agents and chemical materials are added, and no secondary pollution is caused to the environment. It is environmentally friendly, energy-saving, and deodorizing, and can greatly reduce mosquitoes and flies, and improve the urban ecological and sanitary environment. Summary of the invention

[0004] The present invention aims to overcome the technical problem of poor pretreatment effect of landfill leachate in the prior art, and provides a new separation pretreatment device and method for landfill leachate, which can effectively pretreat and classify the landfill leachate, thereby facilitating the subsequent treatment of waste liquid and solid waste.

[0005] The present invention provides a novel separation and pretreatment device for landfill leachate, comprising:

[0006] The first sedimentation tank is used for sedimentation treatment of the landfill leachate to generate a first sedimentation liquid A and a first sedimentation solid B, and is used for transferring the first sedimentation liquid A to the second sedimentation tank, and is used for transferring the first sedimentation solid B to the solid treatment device;

[0007] The second sedimentation tank is connected to the first sedimentation tank, and is used to receive the first sedimentation liquid A transmitted by the first sedimentation tank, and is used to adjust the pH of the first sedimentation liquid A to 5-7 and perform sedimentation treatment to generate a second sedimentation liquid C and a second sedimentation solid D, and is used to transmit the second sedimentation liquid C to the butterfly tube nanofiltration system, and is used to transmit the second sedimentation solid D to the solid treatment device; the second sedimentation tank can precipitate heavy metal ions in the landfill leachate;

[0008] Butterfly tube nanofiltration system: connected to the second sedimentation tank, used to receive the second sedimentation liquid C transmitted by the second sedimentation tank, used to concentrate the second sedimentation liquid C through butterfly tube nanofiltration to generate a third sedimentation liquid F, used to transmit the third sedimentation liquid F to the third sedimentation tank, and used to transmit the formed recycled water to the water recovery system;

[0009] The third sedimentation tank is connected to the butterfly tube nanofiltration system, and is used to receive the third sedimentation liquid F transmitted by the butterfly tube nanofiltration system, and is used to adjust the pH of the third sedimentation liquid F to 8-10 and perform sedimentation treatment to generate the fourth sedimentation liquid F and the third sedimentation solid G, and is used to transmit the fourth sedimentation liquid F to the liquid treatment device, and is used to transmit the third sedimentation solid G to the solid treatment device; the third sedimentation tank can precipitate sulfide, sulfate ions and the like in the landfill leachate;

[0010] Water recovery system: connected to the butterfly tube nanofiltration system, used to receive the recovered water transmitted by the butterfly tube nanofiltration system;

[0011] Liquid processing device: connected to the third sedimentation tank, used to receive the third sedimentation liquid F transmitted by the third sedimentation tank;

[0012] Solid processing device: connected to the first sedimentation tank, the second sedimentation tank, and the third sedimentation tank, used to receive the first sedimentation solid B transmitted from the first sedimentation tank, used to receive the second sedimentation solid D transmitted from the second sedimentation tank, and used to receive the third sedimentation solid G transmitted from the third sedimentation tank.

[0013] In the novel separation and pretreatment device for landfill leachate described in the present invention, as a preferred embodiment, the first precipitated solid B includes sand and dust.

[0014] In the novel separation and pretreatment device for landfill leachate described in the present invention, as a preferred embodiment, the second precipitated solid includes a heavy metal salt.

[0015] In the novel separation and pretreatment device for landfill leachate described in the present invention, as a preferred embodiment, the third precipitated solid G includes calcium carbonate and calcium sulfate.

[0016] The novel separation pretreatment method of landfill leachate of the present invention comprises the following steps:

[0017] S1. First sedimentation treatment: the landfill leachate is placed in a first sedimentation tank for 1 to 2 hours to form a first sedimentation liquid A on the upper layer and a first sedimentation solid B on the lower layer;

[0018] S2, first pH adjustment: the first precipitation liquid A is transferred to the second precipitation tank, the first pH adjuster is added to adjust the pH to 5-7, and the mixture is allowed to stand for 2-3 hours to form a second precipitation liquid C on the upper layer and a second precipitation solid D on the lower layer;

[0019] S3, butterfly tube nanofiltration: the second precipitation liquid C is transmitted to the butterfly tube nanofiltration system, and the third precipitation liquid E is generated after being processed by the butterfly tube nanofiltration system;

[0020] S4, second pH adjustment: the third precipitation liquid E is transferred to the third precipitation tank, the second pH adjuster is added to adjust the pH to 8-10, and the mixture is allowed to stand for 1-2 hours to form a fourth precipitation liquid F on the upper layer and a third precipitation solid G on the lower layer;

[0021] S5. Recover the first precipitated solid B, the second precipitated solid D, the third precipitated solid G and the fourth precipitated liquid F to be further processed, completing the separation pretreatment.

[0022] In the novel separation pretreatment method for landfill leachate described in the present invention, as a preferred embodiment, the first pH regulator in step S2 is sulfuric acid.

[0023] In the novel separation pretreatment method for landfill leachate described in the present invention, as a preferred embodiment, the first pH regulator in step S4 is calcium hydroxide.

[0024] The present invention has the following advantages:

[0025] (1) First, solid-liquid separation is performed on the landfill leachate to reduce the damage of solids such as sand, dust, etc. to the pretreatment device;

[0026] (2) Reduce the concentration of heavy metal ions, sulfides, phosphates, etc. in landfill leachate by pH adjustment;

[0027] (3) Classify and separate the products to be treated after the pretreatment of the leachate, so as to facilitate the next step of treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a composition diagram of a new type of separation and pretreatment device for landfill leachate;

[0029] Figure 2 The present invention is a flow chart of a new separation and pretreatment method for landfill leachate.

[0030] Reference numerals:

[0031] 1. The first sedimentation tank; 2. The second sedimentation tank; 3. The butterfly tube nanofiltration system; 4. The third sedimentation tank; 5. The water recovery system; 6. The liquid treatment device; 7. The solid treatment device. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figure 1 As shown, a new type of separation and pretreatment device for landfill leachate comprises:

[0034] The first sedimentation tank 1 is used for sedimentation treatment of landfill leachate to generate a first sedimentation liquid A and a first sedimentation solid B, and is used for transferring the first sedimentation liquid A to the second sedimentation tank 2, and is used for transferring the first sedimentation solid B to the solid treatment device 7; the first sedimentation solid B includes sand and dust;

[0035] The second sedimentation tank 2 is connected to the first sedimentation tank 1, and is used to receive the first sedimentation liquid A transmitted by the first sedimentation tank 1, and is used to adjust the pH of the first sedimentation liquid A to 5-7 and perform sedimentation treatment to generate a second sedimentation liquid C and a second sedimentation solid D, and is used to transmit the second sedimentation liquid C to the butterfly tube nanofiltration system 3, and is used to transmit the second sedimentation solid D to the solid processing device 7; the second sedimentation solid includes heavy metal salts;

[0036] Butterfly tube nanofiltration system 3: connected to the second sedimentation tank 2, used to receive the second sedimentation liquid C transmitted by the second sedimentation tank 2, used to concentrate the second sedimentation liquid C through butterfly tube nanofiltration to generate a third sedimentation liquid F, used to transmit the third sedimentation liquid F to the third sedimentation tank 4, and used to transmit the formed recycled water to the water recovery system 5;

[0037] The third sedimentation tank 4 is connected to the butterfly tube nanofiltration system 3, and is used to receive the third sedimentation liquid F transmitted by the butterfly tube nanofiltration system 3, and is used to adjust the pH of the third sedimentation liquid F to 8-10 and perform sedimentation treatment to generate a fourth sedimentation liquid F and a third sedimentation solid G, and is used to transmit the fourth sedimentation liquid F to the liquid treatment device 6, and is used to transmit the third sedimentation solid G to the solid treatment device 7; the third sedimentation solid G includes calcium carbonate and calcium sulfate;

[0038] Water recovery system 5: connected to the butterfly tube nanofiltration system 3, used to receive the recovered water transmitted by the butterfly tube nanofiltration system 3;

[0039] Liquid treatment device 6: connected to the third sedimentation tank, used to receive the third sedimentation liquid F transmitted by the third sedimentation tank 4;

[0040] Solid processing device 7: connected to the first sedimentation tank 1, the second sedimentation tank 2, and the third sedimentation tank 3, used for receiving the first sedimentation solid B transmitted from the first sedimentation tank 1, used for receiving the second sedimentation solid D transmitted from the second sedimentation tank 2, and used for receiving the third sedimentation solid G transmitted from the third sedimentation tank 3.

[0041] like Figure 2 As shown, during use, this embodiment includes the following steps:

[0042] S1, first sedimentation treatment: the landfill leachate is placed in the first sedimentation tank 1 for 1 to 2 hours to form a first sedimentation liquid A on the upper layer and a first sedimentation solid B on the lower layer;

[0043] S2, first pH adjustment: the first precipitation liquid A is transferred to the second precipitation tank 2, sulfuric acid is added to adjust the pH to 5-7, and the mixture is allowed to stand for 2-3 hours to form a second precipitation liquid C on the upper layer and a second precipitation solid D on the lower layer;

[0044] S3, butterfly tube nanofiltration: the second precipitation liquid C is transmitted to the butterfly tube nanofiltration system 3, and the third precipitation liquid E is generated after being processed by the butterfly tube nanofiltration system 3;

[0045] S4, second pH adjustment: the third precipitation liquid E is transferred to the third precipitation tank 4, calcium hydroxide is added to adjust the pH to 8-10, and the mixture is allowed to stand for 1-2 hours to form a fourth precipitation liquid F on the upper layer and a third precipitation solid G on the lower layer;

[0046] S5. Recover the first precipitated solid B, the second precipitated solid D, the third precipitated solid G and the fourth precipitated liquid F to be further processed, completing the separation pretreatment.

[0047] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that any modification, change or equivalent that can be made without departing from the spirit and scope defined by the claims will fall within the protection scope of the present invention.

Claims

1. A new type of separation and pretreatment device for landfill leachate, characterized by: include: A first sedimentation tank (1): used for sedimentation treatment of landfill leachate to generate a first sedimentation liquid A and a first sedimentation solid B, used for transferring the first sedimentation liquid A to a second sedimentation tank (2), and used for transferring the first sedimentation solid B to a solid treatment device (7); A second sedimentation tank (2) is connected to the first sedimentation tank (1), and is used to receive the first sedimentation liquid A transmitted by the first sedimentation tank (1), and is used to adjust the pH value of the first sedimentation liquid A to 5-7 and perform sedimentation treatment to generate a second sedimentation liquid C and a second sedimentation solid D, and is used to transmit the second sedimentation liquid C to the butterfly tube nanofiltration system (3), and is used to transmit the second sedimentation solid D to the solid treatment device (7); a butterfly tube nanofiltration system (3) connected to the second sedimentation tank (2), used for receiving the second sedimentation liquid C transmitted by the second sedimentation tank (2), used for concentrating the second sedimentation liquid C through the butterfly tube nanofiltration to generate a third sedimentation liquid F, used for transmitting the third sedimentation liquid F to the third sedimentation tank (4), and used for transmitting the generated recycled water to the water recycling system (5); A third sedimentation tank (4) is connected to the butterfly tube nanofiltration system (3), and is used to receive the third sedimentation liquid F transmitted by the butterfly tube nanofiltration system (3), to adjust the pH of the third sedimentation liquid F to 8-10 and to perform sedimentation treatment to generate a fourth sedimentation liquid F and a third sedimentation solid G, to transmit the fourth sedimentation liquid F to the liquid treatment device (6), and to transmit the third sedimentation solid G to the solid treatment device (7); A water recovery system (5) connected to the butterfly tube nanofiltration system (3) and used to receive the recovered water transmitted by the butterfly tube nanofiltration system (3); A liquid treatment device (6) connected to the third sedimentation tank (4) and used to receive the third sedimentation liquid F transmitted by the third sedimentation tank (4); Solid processing device (7): connected to the first sedimentation tank (1), the second sedimentation tank (2), and the third sedimentation tank (4), used for receiving the first sedimentation solid B transmitted by the first sedimentation tank (1), used for receiving the second sedimentation solid D transmitted by the second sedimentation tank (2), and used for receiving the third sedimentation solid G transmitted by the third sedimentation tank (4).

2. A new type of garbage infiltration separation pretreatment device according to claim 1, characterized in that: The first precipitated solids B include sand and dust.

3. A new type of garbage infiltration separation pretreatment device according to claim 1, characterized in that: The second precipitated solid comprises a heavy metal salt.

4. A new type of garbage infiltration separation pretreatment device according to claim 1, characterized in that: The third precipitated solid G includes calcium carbonate and calcium sulfate.

5. A novel separation pretreatment method for landfill leachate, characterized in that: The following steps are involved: S1, first sedimentation treatment: the landfill leachate is placed in a first sedimentation tank (1) for 1 to 2 hours to form a first sedimentation liquid A on the upper layer and a first sedimentation solid B on the lower layer; S2, first pH adjustment: the first precipitation liquid A is transferred to the second precipitation tank (2), the first pH adjuster is added to adjust the pH to 5-7, and the mixture is allowed to stand for 2-3 hours to form a second precipitation liquid C on the upper layer and a second precipitation solid D on the lower layer; S3, butterfly tube nanofiltration: the second precipitation liquid C is transmitted to the butterfly tube nanofiltration system (3), and is processed by the butterfly tube nanofiltration system (3) to generate a third precipitation liquid E; S4, second pH adjustment: the third precipitation liquid E is transferred to the third precipitation tank (4), a second pH adjuster is added to adjust the pH to 8-10, and the mixture is allowed to stand for 1-2 hours to form a fourth precipitation liquid F on the upper layer and a third precipitation solid G on the lower layer; S5. Recover the first precipitated solid B, the second precipitated solid D, the third precipitated solid G and the fourth precipitated liquid F to be further processed, completing the separation pretreatment.

6. A novel separation and pretreatment method for landfill leachate according to claim 5, characterized in that: In step S2, the first pH adjuster is sulfuric acid.

7. A novel separation and pretreatment method for landfill leachate according to claim 5, characterized in that: In step S4, the first pH adjusting agent is calcium hydroxide.

8. A novel separation and pretreatment method for landfill leachate according to claim 5, characterized in that: The first precipitated solid B includes sand and dust; the second precipitated solid includes heavy metal salts; and the third precipitated solid G includes calcium carbonate and calcium sulfate.

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