Leachate treatment device adopting sulfur autotrophic nitrogen removal technology

Abstract

The utility model relates to the technical field of wastewater treatment devices, and discloses a leachate treatment device adopting a sulfur autotrophic nitrogen removal technology. According to the leachate treatment device adopting the sulfur autotrophic nitrogen removal technology, an anaerobic MBR assembly, a sulfur-based autotrophic denitrification assembly, a short-cut nitrification assembly, an anaerobic ammonia nitrification assembly and a membrane filtration assembly are sequentially arranged along the advancing route of leachate; the anaerobic MBR assembly comprises an anaerobic bioreactor and an anaerobic tubular module, the top end of the anaerobic bioreactor is provided with a feed pipe and a biogas discharge pipe, and the lower part of the side wall of the anaerobic bioreactor is respectively provided with a sludge discharge pipe and a liquid discharge pipe; the liquid discharge pipe is connected with the feed end of the anaerobic tubular module, a sludge return pipe is mounted at a sludge outlet of the anaerobic tubular module, and the sludge return pipe is communicated with the anaerobic bioreactor. According to the utility model, the anaerobic MBR component and the sulfenyl autotrophic denitrification component are used for denitrification under the synergistic effect, an organic carbon source is not needed, the sludge yield is low, great aeration is not needed, and the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment device technical field especially a kind of leachate treatment device using sulfur autotrophic denitrification technology. BACKGROUND

[0002] The high nitrogen in leachate makes the nitrate concentration of surface water and groundwater exceed the standard, and in severe cases, leads to water body hypoxia, eutrophication, and even loss of ecological balance. Compared to the high operating cost, low selectivity and secondary pollution after treatment of physical and chemical methods, biological methods have the advantages of mild treatment conditions, low cost and high denitrification efficiency, and are widely used in wastewater treatment field. At present, landfill leachate treatment mostly adopts the treatment process of "anaerobic+A / O+advanced treatment", and the biochemical effluent needs to be treated by a series of membrane technology for advanced treatment to ensure the removal of hardness and salt in wastewater and ensure that the effluent quality meets the standard. In recent years, the wastewater treatment discharge standards in many places have been upgraded from level B to level A, and even higher. As one of the important indicators in wastewater discharge standards, if the total nitrogen content is to meet the high removal standard, a large amount of carbon source needs to be added during wastewater treatment. At present, most wastewater treatment plants achieve nitrogen standard through nitrification-denitrification. These wastewater treatment plants are facing the reality of having to add carbon source and high carbon source cost.

[0003] In the sulfur autotrophic denitrification process, sulfur autotrophic bacteria can use reduced sulfur such as sulfur ions, elemental sulfur or thiosulfate as electron donors to reduce nitrate to nitrogen. Compared to the traditional addition of organic carbon source, the cost of reduced sulfur is low, the sludge production is less, and the treatment cost of sludge is also reduced. Therefore, in recent years, the sulfur autotrophic denitrification process is gradually replacing the traditional denitrification process in project application. For example, Chinese patent CN115385447A discloses a method for treating landfill leachate, comprising the following steps: 1) using anaerobic methanogenic bacteria to anaerobically digest the landfill leachate to obtain methane and anaerobically digested effluent; 2) using sulfur-based autotrophic denitrifying bacteria to treat the anaerobically digested effluent to obtain nitrogen and sulfur-based autotrophic denitrification effluent; 3) using aerobic ammonia-oxidizing bacteria to treat the sulfur-based autotrophic denitrification effluent to obtain short-cut nitrification effluent; 4) using anaerobic ammonia-oxidizing bacteria to treat the short-cut nitrification effluent to generate nitrogen, elemental sulfur and anaerobic ammonia-oxidation effluent; 5) mixing part of the anaerobic ammonia-oxidation effluent with the anaerobically digested effluent and continuing to use sulfur-based autotrophic denitrifying bacteria for treatment, and filtering the remaining part of the anaerobic ammonia-oxidation effluent to remove residual organic matter and nitrogen-containing compounds, achieving denitrification and desulfurization of landfill leachate and reducing the aeration energy consumption in the short-cut nitrification stage, saving electron donors and operating costs.

[0004] However, the existing leachate treatment process using sulfur autotrophic denitrification technology still has the following problems: in the sulfur autotrophic denitrification technology, a sulfur-based composite filler needs to be added, the filler has high porosity, and in the process of the anaerobic digestion effluent entering the sulfur-based autotrophic denitrification tank, part of the anaerobic sludge is carried to be wrapped on the surface of the sulfur-based filler for nitrification, so that the sulfur autotrophic microorganisms are not easy to adhere, and the denitrification efficiency is reduced. On the other hand, the filler is usually added at one time, the amount of filler in the system is fixed, the anaerobic effluent is easy to run mud, the sludge load in the anaerobic reactor is not high enough, and the effluent quality is poor, which has an adverse effect on the sulfur autotrophic nitrification system. Practical new type content

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a leachate treatment device using sulfur autotrophic denitrification technology. In the present application, the anaerobic MBR assembly and the sulfur-based autotrophic denitrification assembly cooperate, the anaerobic MBR assembly is added to the leachate treatment system, a new process of "anaerobic MBR + sulfur autotrophic denitrification + advanced treatment" is adopted, the anaerobic MBR assembly completely traps the anaerobic sludge in the anaerobic reactor, preventing the anaerobic sludge from entering the sulfur-based autotrophic denitrification assembly and wrapping on the surface of the filler, the effluent quality and quantity of the anaerobic MBR assembly are stable, the addition amount of the filler can be flexibly adjusted according to the influent nitrate nitrogen concentration, the precise control of the sulfur autotrophic denitrification is realized, the emergency accidents are reduced, and the stability of the whole process system is ensured.

[0006] The technical solution adopted by the present application to solve the technical problem is:

[0007] A leachate treatment device using sulfur autotrophic denitrification technology, which is sequentially provided with an anaerobic MBR assembly, a sulfur-based autotrophic denitrification assembly, a short-cut nitrification assembly, an anaerobic ammonium oxidation assembly and a membrane filtration assembly along the leachate running route.

[0008] The anaerobic MBR assembly comprises an anaerobic biological reactor and an anaerobic pipe module, the top end of the anaerobic biological reactor is provided with a feed pipe and a biogas discharge pipe, the lower part of the side wall of the anaerobic biological reactor is respectively provided with a sludge discharge pipe and a liquid discharge pipe; the liquid discharge pipe is connected with the feed end of the anaerobic pipe module, a sludge return pipe is installed on the sludge outlet of the anaerobic pipe module, and the sludge return pipe is communicated with the anaerobic biological reactor; a permeate discharge pipe is installed on the liquid outlet of the anaerobic pipe module, and the permeate discharge pipe is connected to the feed end of the sulfur-based autotrophic denitrification assembly.

[0009] Further, the sulfur-based autotrophic denitrification assembly comprises a sulfur-based autotrophic denitrification tower, the inner cavity of the sulfur-based autotrophic denitrification tower is sequentially provided with a discharge cavity, a filler layer and a feed cavity from top to bottom, the permeate discharge pipe is communicated with the feed cavity, and the discharge cavity is provided with a water outlet pipe.

[0010] Further, the sludge discharge pipe and the liquid discharge pipe are respectively arranged on the two side walls of the anaerobic biological reactor.

[0011] Further, a circulating pump is arranged on the liquid discharge pipe.

[0012] Further, the anaerobic pipe module comprises a plurality of anaerobic tubular membrane reactors arranged in parallel, the feed end of each anaerobic tubular membrane reactor is connected with the liquid discharge pipe, the solid discharge end of each anaerobic tubular membrane reactor is connected with the sludge return pipe, and the liquid discharge end of each anaerobic tubular membrane reactor is connected with the permeate discharge pipe.

[0013] Further, the height of the filler layer is 1 / 3 of the height of the sulfur-based autotrophic denitrification tower.

[0014] Further, the filler layer comprises a filler layer frame, and the filler layer frame is filled with fillers.

[0015] The utility model discloses the beneficial effect is: the utility model discloses simple structure, reasonable in design has the following advantages:

[0016] (1), adopt sulfur autotrophic technology to carry out denitrification, need not organic carbon source, and sludge production is low and does not need aeration greatly, reduces operating cost;

[0017] (2), anaerobic MBR assembly can be completely retained in anaerobic biological reactor in anaerobic mud, prevent anaerobic mud from entering sulfur-based autotrophic denitrification tower and wrapping in the surface layer of filler;

[0018] (3), the stability of the water quality and quantity of anaerobic MBR assembly effluent, so that the dosage of the filler in the sulfur-based autotrophic denitrification tower can be flexibly adjusted according to the influent nitrate concentration, realizing the precise control of sulfur autotrophic denitrification, reducing emergency accidents, and ensuring the stability of the whole process system. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0020] Figure 1 It is the structure diagram of the utility model;

[0021] Figure 2 It is the structure diagram of the anaerobic MBR device and the sulfur-based autotrophic denitrification device.

[0022] In the figure: 100. anaerobic MBR assembly, 200. sulfur-based autotrophic denitrification assembly, 300. short-cut nitrification assembly, 400. anaerobic ammonium oxidation assembly, 500. membrane filtration assembly;

[0023] 1. anaerobic bioreactor, 2. feed pipe, 3. biogas discharge pipe, 4. sludge discharge pipe, 5. liquid discharge pipe, 6. circulating pump, 7. sludge backflow pipe, 8. anaerobic tubular module, 9. sulfur-based autotrophic denitrification tower, 10. effluent pipe, 11. permeate discharge pipe, 12. filler layer, 13. anaerobic tubular membrane reactor. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0025] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form also includes the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0026] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] As shown in Figure 1 and Figure 2 The leachate treatment device using sulfur autotrophic denitrification technology is provided with an anaerobic MBR assembly 100, a sulfur-based autotrophic denitrification assembly 200, a short-cut nitrification assembly 300, an anaerobic ammonium oxidation assembly 400 and a membrane filtration assembly 500 in sequence along the leachate travel route.

[0028] The anaerobic MBR assembly 100 comprises an anaerobic biological reactor 1 and an anaerobic tubular module 8, the top end of the anaerobic biological reactor 1 is provided with a feed pipe 2 and a biogas discharge pipe 3, the lower part of the side wall of the anaerobic biological reactor 1 is respectively provided with a sludge discharge pipe 4 and a liquid discharge pipe 5; the liquid discharge pipe 5 is connected with the feed end of the anaerobic tubular module 8, the sludge outlet of the anaerobic tubular module 8 is provided with a sludge backflow pipe 7, the sludge backflow pipe 7 is communicated with the anaerobic biological reactor 1; the liquid outlet of the anaerobic tubular module 8 is provided with a permeate discharge pipe 11, the permeate discharge pipe 11 is connected to the feed end of the sulfur-based autotrophic denitrification assembly 200.

[0029] The sulfur-based autotrophic denitrification assembly 200 comprises a sulfur-based autotrophic denitrification tower 9, the inner cavity of the sulfur-based autotrophic denitrification tower 9 is sequentially provided with a discharge cavity, a filler layer 12 and a feed cavity from top to bottom, the permeate discharge pipe 11 is communicated with the feed cavity, and the discharge cavity is provided with a water outlet pipe 10.

[0030] The sludge discharge pipe 4 and the liquid discharge pipe 5 are respectively located on the two side walls of the anaerobic biological reactor 1. The liquid discharge pipe 5 is provided with a circulating pump 6.

[0031] The anaerobic tubular module 8 comprises a plurality of anaerobic tubular membrane reactors 13 which are arranged in parallel, the feed end of each anaerobic tubular membrane reactor 13 is connected with the liquid discharge pipe 5, the solid discharge end of each anaerobic tubular membrane reactor 13 is connected with the sludge backflow pipe 7, and the liquid discharge end of each anaerobic tubular membrane reactor 13 is connected with the permeate discharge pipe 11.

[0032] The height of the filler layer 12 is 1 / 3 of the height of the sulfur-based autotrophic denitrification tower 9; the filler layer 12 comprises a filler layer frame, and the filler layer frame is filled with fillers.

[0033] Example 1

[0034] The organic matter concentration of the garbage leachate to be treated is 57000 mg / L, and the ammonia nitrogen concentration is 2200 mg / L. The above-mentioned leachate treatment device is used, and the treatment process is as follows:

[0035] (1) The garbage leachate enters the anaerobic biological reactor 1 through the feed pipe 2, and is subjected to anaerobic treatment by using anaerobic bacteria, to obtain methane and anaerobic effluent, the methane is discharged from the biogas discharge pipe 3, and the anaerobic effluent is discharged from the liquid discharge pipe 5, the ammonia nitrogen concentration of the anaerobic effluent is 2200 mg / L, and the organic matter concentration is 5700 mg / L;

[0036] (2), the anaerobic ammonia oxidation effluent containing about 220mg / L nitrate is backflowed to the influent pipe of the sulfur-based autotrophic denitrification tower 9, deep denitrification is carried out by using in-situ sulfur ions as electron donors, when the N / S molar ratio is 1.68, sulfur-based autotrophic denitrification occurs, the product is sulfate and nitrogen, and 95% of nitrate nitrogen can be removed by using sulfur ions as electron donors; the effluent enters the short-cut nitrification assembly 300 through the effluent pipe 10;

[0037] (3), in the short-cut nitrification assembly 300, the sulfur-based autotrophic denitrification effluent is converted into short-cut nitrification effluent containing nitrite by aerobic ammonia oxidation bacteria under the action of oxygen, and the effluent enters the anaerobic ammonium oxidation assembly 400;

[0038] (4), in the anaerobic ammonium oxidation assembly 400, anaerobic ammonia oxidation is carried out by using nitrite and ammonia nitrogen in the short-cut nitrification effluent by nitrite anaerobic ammonia oxidation bacteria, wherein nitrite is used as the electron acceptor of anaerobic ammonia oxidation, and nitrogen and anaerobic ammonia oxidation effluent are generated; anaerobic ammonia oxidation is carried out by using sulfate and ammonia nitrogen in the sulfur-based autotrophic denitrification effluent by sulfate anaerobic ammonia oxidation bacteria, wherein sulfate is used as the electron acceptor of anaerobic ammonia oxidation, and sulfur, nitrogen and anaerobic ammonia oxidation effluent are generated; the ammonia nitrogen concentration in the anaerobic ammonia oxidation effluent is 22mg / L, and the organic matter concentration is 600mg / L;

[0039] (5), the anaerobic ammonia oxidation effluent enters the membrane filtration assembly 500, and after deep treatment, finally reaches the discharge standard, the ammonia nitrogen concentration is 10mg / L, and the organic matter concentration is 60mg / L.

[0040] In summary, the utility model has the advantages of simple structure, reasonable design and the following advantages:

[0041] (1), the sulfur autotrophic technology is used for denitrification, no organic carbon source is needed, sludge production is low, and aeration is not needed, so that the operation cost is reduced;

[0042] (2), the anaerobic MBR assembly 100 can completely retain anaerobic sludge in the anaerobic biological reactor 1, so that the anaerobic sludge is prevented from entering the sulfur-based autotrophic denitrification tower 9 and being wrapped on the surface of the filler;

[0043] (3), since the sulfur-based filler in the sulfur-based autotrophic denitrification tower 9 is usually added at one time, the stability of the effluent quality and quantity of the anaerobic MBR assembly 100 enables the addition amount of the filler in the sulfur-based autotrophic denitrification tower 9 to be flexibly adjusted according to the influent nitrate nitrogen concentration, so that precise control of sulfur autotrophic denitrification is realized, emergency accidents are reduced, and the stability of the whole process system is ensured.

[0044] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A leachate treatment apparatus employing a sulfur autotrophic denitrification technique, characterized by: An anaerobic MBR assembly (100), a sulfur-based autotrophic denitrification assembly (200), a short-cut nitrification assembly (300), an anaerobic ammonium oxidation assembly (400) and a membrane filtration assembly (500) are sequentially arranged along a leachate travel route; The anaerobic MBR assembly (100) comprises an anaerobic bioreactor (1) and an anaerobic tubular module (8), the top end of the anaerobic bioreactor (1) is provided with a feed pipe (2) and a biogas discharge pipe (3), the lower part of the side wall of the anaerobic bioreactor (1) is respectively provided with a sludge discharge pipe (4) and a liquid discharge pipe (5); the liquid discharge pipe (5) is connected with the feed end of the anaerobic tubular module (8), the sludge outlet of the anaerobic tubular module (8) is provided with a sludge backflow pipe (7), the sludge backflow pipe (7) is communicated with the anaerobic bioreactor (1); the liquid outlet of the anaerobic tubular module (8) is provided with a permeate discharge pipe (11), the permeate discharge pipe (11) is connected to the feed end of the sulfur-based autotrophic denitrification assembly (200).

2. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 1, characterized by: The sulfur-based autotrophic denitrification assembly (200) comprises a sulfur-based autotrophic denitrification tower (9), the inner cavity of the sulfur-based autotrophic denitrification tower (9) is sequentially provided with a discharge cavity, a filler layer (12) and a feed cavity from top to bottom, the permeate discharge pipe (11) is communicated with the feed cavity, and the discharge cavity is provided with a water outlet pipe (10).

3. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 1, characterized by: The sludge discharge pipe (4) and the liquid discharge pipe (5) are respectively located on the two side walls of the anaerobic bioreactor (1).

4. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 1, characterized by: A circulating pump (6) is arranged on the liquid discharge pipe (5).

5. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 1, characterized by: The anaerobic tubular module (8) comprises a plurality of anaerobic tubular membrane reactors (13) arranged in parallel, the feed end of each anaerobic tubular membrane reactor (13) is connected with the liquid discharge pipe (5), the solid discharge end of each anaerobic tubular membrane reactor (13) is connected with the sludge backflow pipe (7), and the liquid discharge end of each anaerobic tubular membrane reactor (13) is connected with the permeate discharge pipe (11).

6. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 2, characterized by: The height of the filler layer (12) is 1 / 3 of the height of the sulfur-based autotrophic denitrification tower (9).

7. The leachate treatment apparatus employing sulfur autotrophic denitrification technology according to claim 2, characterized by: The filler layer (12) comprises a filler layer frame, and the filler layer frame is filled with fillers.

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