Device for extracting humic acid in landfill leachate

Abstract

The device comprises a nitrification box body, a mud-water separation element and an extraction element, a plurality of groups of purification assemblies are arranged in the nitrification box body, and the output end of the nitrification box body is connected with the input end of the mud-water separation element; the output end of the mud-water separation element is respectively connected with the input end of the nitrification box body and the extraction element; the nitrification box body is used for carrying out purification treatment on the input percolate by adopting a plurality of groups of purification assemblies to obtain wastewater; the mud-water separation element is used for carrying out mud-water separation on the wastewater to obtain activated sludge and separated water; the extraction element is used for extracting humic acid in separated water to obtain humic acid and purified water, and the humic acid is stored in the humic acid storage tank element. According to the device, humic acid is extracted from leachate through mutual cooperation of multiple groups of purification assemblies, mud-water separation elements and extraction elements which are connected in a penetrating manner, the efficiency is high, the cost is low, resources can be recycled, and the resource utilization rate is increased.

Description

Technical Field

[0001] The present application relates to the technical field of humic acid extraction, and in particular to a device for extracting humic acid from landfill leachate. Background Art

[0002] Humic acid (HA) is derived from humus substances that are difficult to decompose after the decomposition of auto and plant residues. It is a very complex class of macromolecular organic matter, which is widely present in various natural environments such as water bodies and soil. Humic acid HA has the functions of passivating heavy metals, improving soil, activating insoluble elements, promoting plant absorption of trace elements, improving the slow release of nutrients, stimulating plant development and enhancing plant resistance. It has high value in agriculture, gardening, environmental protection, and medical treatment. The existing HA extraction methods mainly include alkali dissolution and acid precipitation, solvent extraction, pyrolysis extraction, etc. With the development of society and the increase of urban population, the amount of leachate produced from urban domestic garbage is large, the concentration of pollutants is high, and the water quality composition is complex. However, the existing single humic acid extraction method is inefficient and costly, which cannot keep up with the development of society. Utility Model Content

[0003] The embodiment of the present application provides a device for extracting humic acid from landfill leachate, which is used to solve the technical problems of low efficiency and high extraction cost of existing methods for extracting humic acid from landfill leachate.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0005] On the one hand, a device for extracting humic acid from landfill leachate is provided, comprising a nitrification box, a mud-water separation element and an extraction element, wherein a plurality of groups of purification components connected through each other are arranged in the nitrification box, the output end of the nitrification box is connected to the input end of the mud-water separation element, and the output end of the mud-water separation element is respectively connected to the input end of the nitrification box and the extraction element;

[0006] The nitrification box is used to purify the input leachate using multiple groups of the purification components to obtain wastewater;

[0007] The mud-water separation element is used to separate the wastewater into mud and water to obtain activated sludge and separation water, and return the activated sludge to the nitrification tank and / or transport it to the sludge collection tank and transport the separation water to the extraction element;

[0008] The extraction element is used to extract the humic acid in the separated water to obtain humic acid and purified water. The humic acid is stored in a humic acid storage tank element.

[0009] Preferably, a conveying drive element for conveying the wastewater to the mud-water separation element is provided between the output end of the nitrification box and the input end of the mud-water separation element.

[0010] Preferably, a circulation pump is provided between the output end of the nitrification box and the input end of the nitrification box.

[0011] Preferably, the reflux ratio of the circulation pump is 10:1.

[0012] Preferably, each group of the purification components comprises a denitrification tank and a nitrification tank connected to the denitrification tank;

[0013] The denitrification tank is used to perform reduction purification treatment on the leachate by using nitrate or nitrite to obtain primary wastewater;

[0014] The nitrification tank is used to sequentially denitrify the primary wastewater using nitrite bacteria and nitrifying bacteria to obtain treated wastewater.

[0015] Preferably, the denitrification pool is provided with a first detection element for detecting the pH value in the denitrification pool.

[0016] Preferably, the nitrification tank is provided with a second detection element for detecting the temperature and dissolved oxygen content in the nitrification tank.

[0017] Preferably, the device for extracting humic acid from landfill leachate comprises a control platform, and the control platform is connected to the mobile terminal.

[0018] Preferably, in the process of purifying the input leachate using multiple groups of purification components, the method for extracting humic acid from the landfill leachate includes: controlling the pH value in the denitrification tank to be: 7.0-7.2, controlling the temperature of the nitrification tank to be 30°C-33°C and the dissolved oxygen content to be 1.0ppm-1.5ppm.

[0019] Preferably, the extraction element is a separation membrane or a material membrane.

[0020] Preferably, the mud-water separation element is an ultrafiltration membrane.

[0021] The device for extracting humic acid from landfill leachate comprises a nitrification box, a mud-water separation element and an extraction element. The nitrification box is provided with a plurality of groups of purification components which are connected through each other. The output end of the nitrification box is connected with the input end of the mud-water separation element, and the output end of the mud-water separation element is respectively connected with the input end of the nitrification box and the extraction element. The nitrification box is used for purifying the input leachate with the plurality of purification components to obtain wastewater. The mud-water separation element is used for performing mud-water separation on the wastewater to obtain activated sludge and separated water, and the activated sludge is refluxed to the nitrification box and / or transported to a sludge collection pool, and the separated water is transported to the extraction element. The extraction element is used for extracting humic acid from the separated water to obtain humic acid and purified water, and the humic acid is stored in a humic acid storage tank element. It can be seen from the above technical scheme that the embodiments of the present application have the following advantages: the humic acid extraction device in the landfill leachate extracts humic acid from the leachate through a plurality of sets of through-connected purification components, mud-water separation elements and extraction elements, which cooperate with each other, have high efficiency and low cost, can also reuse resources, and improve resource utilization, thus solving the technical problems of low efficiency and high extraction cost of the existing humic acid extraction method in landfill leachate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of the structure of the device for extracting humic acid from landfill leachate described in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] The embodiment of the present application provides a device for extracting humic acid from landfill leachate, which solves the technical problems of low efficiency and high extraction cost of existing methods for extracting humic acid from landfill leachate.

[0028] like Figure 1 As shown, an embodiment of the present application provides a humic acid extraction device in landfill leachate, including a nitrification box, a mud-water separation element 5 and an extraction element 6. A multi-stage through-connected purification component is arranged in the nitrification box, the output end of the nitrification box is connected to the input end of the mud-water separation element 5, and the output end of the mud-water separation element 5 is respectively connected to the input end of the nitrification box 10 and the extraction element 6.

[0029] In the embodiment of the present application, the nitrification box is used to purify the input leachate using a multi-stage purification component to obtain wastewater.

[0030] It should be noted that a multi-stage purification component is provided in the nitrification box, and the landfill leachate is processed in sequence by the multi-stage purification component to obtain purified wastewater, which is convenient for subsequent mud-water separation and improves the purification capacity of the leachate. In this embodiment, two sets of purification components connected through are provided in the nitrification box of the humic acid extraction device in the landfill leachate. Among them, the wastewater obtained after the leachate is purified by nitrification and denitrification of the multiple purification components of the nitrification box, most of the organic matter in the wastewater is basically consumed, and most of the remaining organic matter is large molecular humic acid (HA) that is difficult to degrade.

[0031] In the embodiment of the present application, the mud-water separation element 5 is used to separate mud and water from wastewater to obtain activated sludge and separation water, and return the activated sludge to the nitrification tank and / or transport it to the sludge collection tank 16 and transport the separation water to the extraction element 6.

[0032] It should be noted that the mud-water separation element 5 can be selected as an ultrafiltration membrane. Among them, the ultrafiltration membrane is an artificial permeable membrane used in the ultrafiltration process. The ultrafiltration membrane is generally made of polymer materials (such as: cellulose acetate, cellulose acetate esters, polyethylene, polysulfones and polyamides, etc.). In this embodiment, the humic acid extraction device in the landfill leachate uses the mud-water separation function of the mud-water separation element 5, and the separated active sludge part is returned to the first denitrification tank in the nitrification box for continued use, and the other active sludge is sent to the sludge collection tank 16 for separate treatment. The separated separation water enters the extraction element 6.

[0033] In the embodiment of the present application, the extraction element 6 is used to extract humic acid from the separated water to obtain humic acid and purified water, and the humic acid is stored in the humic acid storage tank element 0.

[0034] It should be noted that the extraction element 6 can be selected as a material membrane or a separation membrane. The humic acid extraction device in the landfill leachate uses the selective interception principle of the extraction element 6, and the macromolecular humic acid is intercepted, concentrated and discharged to the humic acid storage tank element 0 for preparing humic acid water-soluble fertilizer. The purified water 7 can be reused industrially or used for greening. In this embodiment, the extraction element 6 uses the material separation principle of the material membrane to separate the macromolecular humic acid from the water.

[0035] The present application provides a device for extracting humic acid from landfill leachate, comprising a nitrification box, a mud-water separation element and an extraction element. A plurality of groups of purification components are arranged in the nitrification box, the output end of the nitrification box is connected to the input end of the mud-water separation element, and the output end of the mud-water separation element is respectively connected to the input end of the nitrification box and the extraction element; the nitrification box is used to purify the input leachate using the plurality of purification components to obtain wastewater; the mud-water separation element is used to separate mud and water from the wastewater to obtain activated sludge and separated water, and to return the activated sludge to the nitrification box and / or to transport it to a sludge collection tank and to transport the separated water to the extraction element; the extraction element is used to extract humic acid from the separated water to obtain humic acid and purified water, and the humic acid is stored in a humic acid storage tank element. The humic acid extraction device in landfill leachate extracts humic acid from the leachate by means of multiple sets of purification components, mud-water separation elements and extraction elements connected in a through manner, which cooperate with each other and have high efficiency and low cost, and can also reuse resources to improve resource utilization, thus solving the technical problems of low efficiency and high extraction cost of the existing humic acid extraction methods in landfill leachate.

[0036] It should be noted that the device for extracting humic acid from landfill leachate only needs a small amount of electricity to separate humic acid from leachate and purify pollutants in water. Compared with the existing chemical method for extracting humic acid, the device for extracting humic acid from landfill leachate does not need to consume a large amount of chemical agents, which can be both economical and environmentally friendly.

[0037] like Figure 1 As shown, in one embodiment of the present application, a conveying drive element 9 for conveying wastewater to the mud-water separation element 5 is provided between the output end of the nitrification box and the input end of the mud-water separation element 5 .

[0038] It should be noted that the delivery drive element 9 can be selected as a delivery pump. In this embodiment, the delivery drive element 9 can deliver wastewater to the mud-water separation element 5 or deliver the separated water separated by the mud-water separation element 5 to the extraction element 6.

[0039] like Figure 1 As shown, in one embodiment of the present application, a circulation pump 8 is provided between the output end of the nitrification box and the input end of the nitrification box. The reflux ratio of the circulation pump 8 is 10:1.

[0040] It should be noted that, in order to prevent the precipitation of activated sludge (bacteria) in the pool inside the nitrification box and to improve the efficiency of pollutant removal, the humic acid extraction device in the landfill leachate is provided with a circulation pump 8 with a reflux ratio of 10:1, so that the sludge at the bottom of the nitrification box will not be deposited and the contact probability between the bacterial community and the pollutants will not be increased, while at the same time the bacterial community will not be broken up, so as to achieve the effect of cultivating dominant bacterial communities and efficiently removing pollutants; dominant bacterial communities (Pseudomonas, Bacillus and Flavobacterium, etc.) with strong organic matter degradation ability can also be cultivated, so that most of the remaining organic matter in the leachate inside the nitrification box is humic acid that is difficult to be degraded by microorganisms.

[0041] like Figure 1 As shown, in one embodiment of the present application, each group of purification components includes a denitrification tank and a nitrification tank connected to the denitrification tank;

[0042] Denitrification tank, used to reduce and purify the leachate by nitrate or nitrite to obtain primary wastewater;

[0043] The nitrification tank is used to denitrify the primary wastewater by nitrite bacteria and nitrifying bacteria in sequence to obtain treated wastewater.

[0044] like Figure 1As shown, in an embodiment of the present application, the humic acid extraction device in the landfill leachate is provided with two groups of purification components, the two groups of purification components are respectively a first purification component and a second purification component, the first purification component includes a primary denitrification tank 1 and a primary nitrification tank 2 which is connected to the primary denitrification tank 1, the second purification component includes a secondary denitrification tank 3 and a secondary nitrification tank 4 which is connected to the secondary denitrification tank 3.

[0045] It should be noted that the leachate of domestic waste enters the primary denitrification tank 1 by gravity or pumping. In the primary denitrification tank 1, nitrate or nitrite is used as an electron acceptor by denitrifying bacteria under anaerobic or anoxic conditions. These denitrifying bacteria can use the organic carbon source in the sewage as an electron donor, and through a series of biochemical reactions, the nitrate is reduced to nitrogen (N2) and escapes from the water surface, thereby completing the removal of nitrogen and organic matter to obtain primary wastewater. Afterwards, under the force of gravity, the leachate is transported from the primary denitrification tank 1 to the primary nitrification tank 2. The nitrification tank plays a core role in biological denitrification in the sewage treatment process. The nitrification tank is mainly used for the conversion of ammonia nitrogen (NH3-N) to nitrite nitrogen (NO2--N) and nitrate nitrogen (NO3--N). Nitrification is an aerobic process, and two different types of autotrophic aerobic bacteria (nitrite bacteria and nitrifying bacteria) jointly complete the two-step nitrification reaction: the first step is the nitrification reaction: ammonia nitrogen is converted into nitrite nitrogen (NH3→NO2-) by ammonia oxidizing bacteria (AOB); the second step is the nitrification reaction: nitrite nitrogen is further converted into nitrate nitrogen (NO2-→NO3-) by nitrite oxidizing bacteria (NOB). Under the action of gravity, it is transported from the primary nitrification tank 2 to the secondary denitrification tank 3 and the secondary nitrification tank 4 in turn, further removing nitrates and organic matter in the water body, thereby achieving the purpose of leachate purification and obtaining wastewater treated by multiple groups of purification components.

[0046] Under aerobic conditions, microorganisms consume oxygen and decompose organic matter in sewage, ultimately generating carbon dioxide, water, and microbial cell biomass. The survival of different microorganisms (bacterial communities) in water mainly depends on factors such as dissolved oxygen, temperature, organic load, and pH value. Dissolved oxygen refers to molecular oxygen dissolved in water, and organic load refers to the amount of organic pollutants accepted by a unit volume of sewage treatment reactor per unit time. Therefore, the humic acid extraction device in the landfill leachate needs to detect the pH value of the denitrification tank in the purification component and the temperature and dissolved oxygen content of the nitrification tank.

[0047] Therefore, in one embodiment of the present application, a first detection element for detecting the pH value in the denitrification tank is provided in the denitrification tank, and a second detection element for detecting the temperature and dissolved oxygen content in the nitrification tank is provided in the nitrification tank.

[0048] It should be noted that the first detection element can be selected as a pH detector. The second detection element can be selected as an online temperature and dissolved oxygen meter. Figure 1 As shown, in this embodiment, the first detection element set on the primary denitrification tank 1 is marked as 10, the first detection element set on the secondary denitrification tank 3 is marked as 12, the second detection element set on the primary nitrification tank 2 is marked as 11, and the second detection element set on the secondary nitrification tank 4 is marked as 13.

[0049] like Figure 1 As shown, in one embodiment of the present application, the device for extracting humic acid from landfill leachate includes a control platform 14 , and the control platform 14 is connected to a mobile terminal 15 .

[0050] It should be noted that the control platform 14 can be a PLC controller, and the control platform 14 is respectively connected to the first detection element and the second detection element. The control platform 14 also controls the circulation pump 8 and the conveying drive element 9 to work. The mobile terminal 15 can be an industrial computer, or a computer, etc. In the present embodiment, the humic acid extraction device in the landfill leachate is automatically operated to extract humic acid through the control platform 14 and the mobile terminal 15. Among them, the operating parameters of the nitrification box, the mud-water separation element and the circulation pump are controlled by the control platform 14 to cultivate a dominant bacterial community (Pseudomonas, Bacillus and Flavobacterium, etc.) with strong organic matter degradation ability, so that the remaining organic matter in the sewage in the nitrification box is mostly humic acid that is difficult to be degraded by microorganisms, and other organic matter in the humic acid is removed by the bacterial community, which is convenient for the extraction of humic acid. The operating parameters include the pH value, temperature, dissolved oxygen content, reflux ratio of the circulation pump in the nitrification box, and the organic load of the sludge reflux through the mud-water separation element. The organic load is preferably selected as 0.2-0.4 kgBOD5 / (kgMLVSS·d), the pH value in the denitrification tank is: 7.0-7.2, the temperature of the nitrification tank is 30°C-33°C and the dissolved oxygen content is 1.0ppm-1.5ppm. The humic acid extraction device in the landfill leachate controls the operating parameters through the control platform to achieve the extraction of high value-added humic acid from the landfill leachate while treating the landfill leachate. Among them, BOD5 / (kgMLVSS·d) refers to the sludge concentration of the mixed liquor.

[0051] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0052] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0053] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0055] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for extracting humic acid from landfill leachate, characterized in that: It comprises a nitrification box, a mud-water separation element and an extraction element, wherein the nitrification box is provided with a plurality of groups of purification components connected through each other, the output end of the nitrification box is connected to the input end of the mud-water separation element, and the output end of the mud-water separation element is respectively connected to the input end of the nitrification box and the extraction element; The nitrification box is used to purify the input leachate using multiple groups of the purification components to obtain wastewater; The mud-water separation element is used to separate the wastewater into mud and water to obtain activated sludge and separation water, and return the activated sludge to the nitrification tank and / or transport it to the sludge collection tank and transport the separation water to the extraction element; The extraction element is used to extract the humic acid in the separated water to obtain humic acid and purified water. The humic acid is stored in a humic acid storage tank element.

2. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: A conveying drive element for conveying the wastewater to the mud-water separation element is arranged between the output end of the nitrification box and the input end of the mud-water separation element.

3. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: A circulation pump is arranged between the output end of the nitrification box and the input end of the nitrification box.

4. The device for extracting humic acid from landfill leachate according to claim 3, characterized in that: The reflux ratio of the circulating pump is 10:

1.

5. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: Each group of purification components includes a denitrification tank and a nitrification tank connected to the denitrification tank; The denitrification tank is used to perform reduction purification treatment on the leachate by using nitrate or nitrite to obtain primary wastewater; The nitrification tank is used to sequentially denitrify the primary wastewater using nitrite bacteria and nitrifying bacteria to obtain treated wastewater.

6. The device for extracting humic acid from landfill leachate according to claim 5, characterized in that: The denitrification pool is provided with a first detection element for detecting the pH value in the denitrification pool.

7. The device for extracting humic acid from landfill leachate according to claim 5, characterized in that: The nitrification tank is provided with a second detection element for detecting the temperature and dissolved oxygen content in the nitrification tank.

8. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: It includes a control platform, which is connected to the mobile terminal.

9. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: The extraction element is a separation membrane or a material membrane.

10. The device for extracting humic acid from landfill leachate according to claim 1, characterized in that: The mud-water separation element is an ultrafiltration membrane.

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