Anaerobic heating system for leachate treatment

Abstract

The utility model provides an anaerobic heating system for leachate treatment, which comprises an adjusting tank, an anaerobic reactor, an aerobic biological tank, an aerobic heat exchange system and an air source heat pump system, the adjusting tank, the anaerobic reactor and the aerobic biological tank are sequentially communicated, the aerobic heat exchange system is circularly communicated with the aerobic biological tank, and the air source heat pump system is communicated with the aerobic biological tank. And the air source heat pump system is partially arranged in the fan room and / or the aerobic biological tank so as to recover heat in the fan room and / or the aerobic biological tank and heat the inlet water of the anaerobic reactor. With the adoption of the scheme, the water inlet temperature of the anaerobic reactor is increased while the environment temperature in the aerobic biological tank is reduced through the aerobic heat exchange system, and the water inlet temperature of the anaerobic reactor is increased while the temperature in the fan room and / or the aerobic biological tank is reduced through the air source heat pump system; and the cooling cost and the heating cost can be saved, and waste heat can be effectively recycled and utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of leachate treatment, in particular to an anaerobic heating system for leachate treatment. Background Art

[0002] Currently, incineration plant leachate is mostly treated using a combination of pretreatment + regulating tank + biological treatment + advanced treatment. Biological treatment often uses anaerobic and aerobic processes.

[0003] Anaerobic processes typically use medium-temperature anaerobic processes, requiring the temperature inside the anaerobic reactor to be maintained at 30-35°C. Therefore, the wastewater inside the anaerobic reactor must be heated to maintain the optimal temperature for the anaerobic reaction. Currently, anaerobic systems are typically heated using secondary steam extracted from incineration plants.

[0004] Since the concentrations of pollutants such as COD and ammonia nitrogen in the anaerobic effluent are still high, aerobic treatment is required. The biochemical reaction process releases heat, and aeration in the biochemical pool also causes the water temperature in the aerobic biochemical pool to be high. The biochemical reaction in the aerobic treatment process usually needs to be maintained at 20-35°C. Therefore, cooling towers, clean water pumps, heat exchangers and other cooling systems are usually required to cool the mixed liquid in the biochemical pool.

[0005] Since aeration is required during aerobic treatment, a fan room is set up when necessary, and electrical equipment such as aeration fans are installed in the room. During operation, some of the electrical energy generated by electrical equipment is converted into heat energy and dissipated into the fan room. The generated heat is usually discharged into the environment through natural exhaust or mechanical ventilation.

[0006] In summary, existing anaerobic reactors often use steam for direct heating, which mixes with wastewater, increasing the wastewater treatment load and the need for increased demineralized water production. This leads to high steam consumption and heating costs. Heat from the aerobic bio-tanks is cooled using a circulating cooling water system, resulting in significant but inefficient heat dissipation within the blower room and high operating costs. Utility Model Content

[0007] The utility model provides an anaerobic heating system for leachate treatment, which solves the problems of high heating cost, high cooling cost and ineffective use of waste heat in the anaerobic heating system for leachate treatment in the prior art.

[0008] In order to solve the above problems, the utility model provides an anaerobic heating system for leachate treatment. The anaerobic heating system for leachate treatment includes a regulating tank, an anaerobic reactor, an aerobic biological tank, an aerobic heat exchange system and an air source heat pump system. The regulating tank, the anaerobic reactor and the aerobic biological tank are connected in sequence. The aerobic heat exchange system is circulated with the aerobic biological tank to extract the mixed liquid in the aerobic biological tank and exchange heat with the inlet water of the anaerobic reactor. The air source heat pump system is partially arranged in the fan room and / or the aerobic biological tank to recover heat in the fan room and / or the aerobic biological tank and heat the inlet water of the anaerobic reactor.

[0009] Furthermore, the aerobic heat exchange system includes a heat exchanger and a heat exchange pipeline. The heat exchanger is arranged on the connecting pipeline between the regulating tank and the anaerobic reactor. The heat exchange pipeline includes a liquid delivery pipe section and a return pipe section. The two ends of the liquid delivery pipe section are respectively connected to the heat exchange outlet of the aerobic biological tank and the heat exchange inlet of the heat exchanger. The two ends of the return pipe section are respectively connected to the heat exchange inlet of the aerobic biological tank and the heat exchange outlet of the heat exchanger.

[0010] Furthermore, the aerobic heat exchange system also includes a cooling circulation pump arranged on the liquid delivery pipe section to extract the mixed liquid in the aerobic biological pool for heat exchange circulation.

[0011] Furthermore, the air source heat pump system includes an evaporator, a compressor, a condenser, an expansion valve and a circulation pipeline, and the evaporator, the compressor, the condenser and the expansion valve are connected end to end in sequence through the circulation pipeline.

[0012] Furthermore, the condenser is arranged on the connecting pipeline between the regulating tank and the anaerobic reactor, the evaporator is arranged in the fan room, the circulation pipeline is filled with refrigerant, the refrigerant circulates in the circulation pipeline and exchanges heat in the evaporator and condenser.

[0013] Furthermore, the anaerobic heating system for leachate treatment further includes an aeration component, which is used to aerate the aerobic biological pond.

[0014] Furthermore, the aeration assembly includes an aeration fan and a plurality of aerators. The aeration fan is arranged in a fan room and is drivingly connected to the plurality of aerators. The plurality of aerators are arranged at intervals in the aerobic biological pool.

[0015] Furthermore, the anaerobic heating system for leachate treatment further comprises an anaerobic water inlet pump, which is arranged on the connecting pipeline between the regulating tank and the anaerobic reactor.

[0016] Furthermore, the anaerobic heating system for leachate treatment further includes a steam component, which is communicated with the anaerobic reactor to heat the inside of the anaerobic reactor.

[0017] Furthermore, the anaerobic heating system for leachate treatment further includes a circulating water cooling component, which is connected to the aerobic biological pool to cool the aerobic biological pool.

[0018] By applying the technical solution of the present invention, an anaerobic heating system for leachate treatment is provided. The anaerobic heating system for leachate treatment includes a regulating tank, an anaerobic reactor, an aerobic biological tank, an aerobic heat exchange system and an air source heat pump system. The regulating tank, the anaerobic reactor and the aerobic biological tank are connected in sequence. The aerobic heat exchange system is cyclically connected to the aerobic biological tank to extract the mixed liquid in the aerobic biological tank and exchange heat with the inlet water of the anaerobic reactor. The air source heat pump system is partially arranged in the fan room and / or the aerobic biological tank to recover heat in the fan room and / or the aerobic biological tank and heat the inlet water of the anaerobic reactor.

[0019] With this solution, leachate first enters a regulating tank for homogenization and equalization, then passes through an anaerobic reactor and an aerobic biotank for anaerobic and aerobic biochemical reactions, respectively. An aerobic heat exchange system is provided to utilize the mixed liquid in the aerobic biotank for heat exchange with the anaerobic reactor inlet water, lowering the ambient temperature within the aerobic biotank while simultaneously raising the inlet temperature. An air-source heat pump system is provided to recover heat from the gas in the fan room and / or aerobic biotank and use it to heat the anaerobic reactor inlet water, lowering the temperature within the fan room and / or aerobic biotank while simultaneously raising the inlet temperature. This arrangement helps save investment and operating costs associated with prior art systems that use circulating water cooling towers and fresh water pumps to cool the aerobic biotank. It also helps reduce steam consumption and heating costs for the anaerobic reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 The figure shows a structural diagram of an anaerobic heating system for leachate treatment provided by an embodiment of the present utility model.

[0022] The above drawings include the following reference numerals:

[0023] 10. Regulating tank;

[0024] 20. Anaerobic reactor;

[0025] 30. Aerobic biological pool;

[0026] 41. Heat exchanger; 42. Heat exchange pipeline; 43. Cooling circulation pump;

[0027] 51. Evaporator; 52. Compressor; 53. Condenser; 54. Expansion valve; 55. Circulation line;

[0028] 60. Fan room;

[0029] 71. Aeration fan; 72. Aerator;

[0030] 80. Anaerobic water inlet pump. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, an embodiment of the present invention provides an anaerobic heating system for leachate treatment, which includes a regulating tank 10, an anaerobic reactor 20, an aerobic biological tank 30, an aerobic heat exchange system, and an air source heat pump system. The regulating tank 10, the anaerobic reactor 20, and the aerobic biological tank 30 are connected in sequence. The aerobic heat exchange system is circulated with the aerobic biological tank 30 to extract the mixed liquid in the aerobic biological tank 30 and exchange heat with the inlet water of the anaerobic reactor 20. The air source heat pump system is partially arranged in the fan room 60 and / or the aerobic biological tank 30 to recover the heat in the fan room 60 and / or the aerobic biological tank 30 and heat the inlet water of the anaerobic reactor 20.

[0033] In this embodiment, leachate first enters the regulating tank 10 for homogenization and equalization, and then sequentially passes through the anaerobic reactor 20 and the aerobic biotank 30 for anaerobic and aerobic biochemical reactions, respectively. An aerobic heat exchange system is provided to utilize the mixed liquid within the aerobic biotank 30 for heat exchange with the inlet water of the anaerobic reactor 20, thereby lowering the ambient temperature within the aerobic biotank 30 while simultaneously raising the inlet water temperature of the anaerobic reactor 20. An air-source heat pump system is provided to recover heat from the gas within the fan room 60 and / or the aerobic biotank 30 and use it to heat the inlet water of the anaerobic reactor 20, thereby lowering the temperature within the fan room 60 and / or the aerobic biotank 30 while simultaneously raising the inlet water temperature of the anaerobic reactor 20. This arrangement helps to reduce the investment and operating costs associated with conventional equipment such as circulating water cooling towers and fresh water pumps for cooling the aerobic biotank. It also helps to reduce the consumption of steam input into the anaerobic reactor 20 and lower heating costs.

[0034] Preferably, the aerobic heat exchange system is first turned on during daily operation to heat the inlet water of the anaerobic reactor 20 using the mixed liquid in the aerobic biological pool 30. If the temperature of the anaerobic reactor 20 still does not meet the requirements on this basis, the air source heat pump system is turned on to recover the waste heat of the air in the fan room 60 and / or the aerobic biological pool 30 to heat the inlet water temperature of the anaerobic reactor 20.

[0035] like Figure 1 As shown, the aerobic heat exchange system includes a heat exchanger 41 and a heat exchange pipeline 42. The heat exchanger 41 is arranged on the connecting pipeline between the regulating tank 10 and the anaerobic reactor 20. The heat exchange pipeline 42 includes a liquid feeding pipe section and a return pipe section. The two ends of the liquid feeding pipe section are respectively connected to the heat exchange outlet of the aerobic biological tank 30 and the heat exchange inlet of the heat exchanger 41. The two ends of the return pipe section are respectively connected to the heat exchange inlet of the aerobic biological tank 30 and the heat exchange outlet of the heat exchanger 41.

[0036] In this embodiment, an aerobic heat exchange system is provided. Since aerobic biochemical reactions release heat, and aerobic biochemical reactions generally need to be maintained at 20-35°C, to prevent the ambient temperature within the aerobic biological pool 30 from being too high, this embodiment uses a heat exchange pipe 42 to extract the mixed liquid within the aerobic biological pool 30, thereby lowering the ambient temperature within the aerobic biological pool 30 and facilitating the aerobic biochemical reaction. Specifically, the extracted mixed liquid with a certain temperature flows through the heat exchanger 41, and the inlet water from the regulating tank 10 to the anaerobic reactor 20 also flows through the heat exchanger 41. The two fluids exchange heat within the heat exchanger 41 to heat the inlet water of the anaerobic reactor 20, thereby reducing the steam consumption required to heat the anaerobic reactor 20. The mixed liquid after heat exchange is then returned to the aerobic biological pool 30 through the heat exchange pipe 42.

[0037] It is understandable that the arrangement of the heat exchange pipeline 42, the heat exchanger 41, and the connecting pipelines between the regulating tank 10 and the anaerobic reactor 20 in this embodiment is not limited to the above embodiment. It is only necessary to ensure that the fluid flowing from the regulating tank 10 to the anaerobic reactor 20 can exchange heat with the mixed liquid extracted from the aerobic biological tank 30, and that the mixed liquid after heat exchange can be returned to the aerobic biological tank 30.

[0038] Specifically, the aerobic heat exchange system also includes a cooling circulation pump 43, located on the liquid delivery pipe section, to extract the mixed liquid from the aerobic biological pool 30 for heat exchange circulation. This arrangement facilitates the extraction of the mixed liquid from the aerobic biological pool 30 and ensures the circulation of the mixed liquid within the heat exchange pipe 42, thereby ensuring the reliability of the aerobic heat exchange system.

[0039] like Figure 1As shown, the air source heat pump system includes an evaporator 51, a compressor 52, a condenser 53, an expansion valve 54, and a circulation pipeline 55. The evaporator 51, the compressor 52, the condenser 53, and the expansion valve 54 are connected end to end via the circulation pipeline 55. The condenser 53 is arranged in the connecting pipeline between the regulating tank 10 and the anaerobic reactor 20. The evaporator 51 is arranged in the fan room 60. The circulation pipeline 55 is filled with a refrigerant, which circulates in the circulation pipeline 55 and exchanges heat with the evaporator 51 and the condenser 53.

[0040] The air-source heat pump system in this embodiment is used to recover the temperature within the fan room 60. Its circulation principle is based on the reverse Carnot cycle. By absorbing heat through evaporation and releasing heat through condensation, the refrigerant can reduce the temperature within the fan room 60 and simultaneously increase the inlet water temperature of the anaerobic reactor 20. It will be appreciated that in other embodiments not shown, the air-source heat pump system can be used to recover waste heat within the aerobic biological pool 30.

[0041] like Figure 1 As shown, the anaerobic heating system for leachate treatment also includes an aeration assembly for aerating the aerobic biological pool 30. This arrangement, through the aeration assembly, helps improve the effectiveness and efficiency of the biochemical reactions within the aerobic biological pool 30. It is understood that aeration also causes the ambient temperature within the aerobic biological pool 30 to rise, and both the aerobic heat exchange system and the air-source heat pump system can recycle this heat.

[0042] Specifically, the aeration assembly includes an aeration fan 71 and a plurality of aerators 72 . The aeration fan 71 is disposed in the fan room 60 and is drivingly connected to the plurality of aerators 72 . The plurality of aerators 72 are spaced apart and disposed in the aerobic biological pool 30 .

[0043] In this embodiment, the aeration fan 71 is arranged in the fan room 60. When it drives multiple aerators 72, it generates heat. The air source heat pump system can recover the heat in the fan room 60 to reduce the ambient temperature of the fan room 60, which is beneficial to the operation of the aeration fan 71.

[0044] like Figure 1 As shown, the anaerobic heating system for leachate treatment further includes an anaerobic water inlet pump 80, which is disposed on the connecting pipe between the regulating tank 10 and the anaerobic reactor 20. This arrangement is conducive to ensuring the efficiency and reliability of leachate delivery from the regulating tank 10 to the anaerobic reactor 20.

[0045] Specifically, the anaerobic heating system for leachate treatment also includes a steam component and a circulating water cooling component. The steam component is connected to the anaerobic reactor 20 to heat the inside of the anaerobic reactor 20; the circulating water cooling component is connected to the aerobic biological pool 30 to cool the aerobic biological pool 30. This arrangement ensures the reliability and stability of the operation of the anaerobic heating system for leachate treatment. Among them, the air source heat pump system and the aerobic heat exchange system are both conducive to reducing the amount of steam required by the steam component to heat the anaerobic reactor 20 and saving the amount of fluid required by the circulating water cooling component to cool the aerobic biological pool 30, reducing steam consumption and reducing heating costs, saving investment or operating costs when using equipment such as circulating water cooling towers and clean water pumps to cool the aerobic biological pool in the prior art.

[0046] It is understandable that when the air source heat pump system and the aerobic heat exchange system can meet the water heating demand for the anaerobic reactor 20, the steam component can be turned off or not set. Similarly, when the air source heat pump system and the aerobic heat exchange system can meet the cooling effect of the aerobic biological pool 30, the circulating water cooling component can be turned off or not set, which is beneficial to reducing investment and operating costs.

[0047] Optionally, the anaerobic reactor 20 also has a circulation pump and a circulation flow path. The condenser 53 of the air source heat pump system and the heat exchanger 41 of the aerobic heat exchange system can also be arranged on the circulation flow path on the inlet side or outlet side of the circulation pump of the anaerobic reactor 20 to facilitate the circulation heating of the fluid in the anaerobic reactor 20.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0050] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anaerobic heating system for leachate treatment, characterized in that: The anaerobic heating system for treating leachate comprises a regulating tank (10), an anaerobic reactor (20), an aerobic biological tank (30), an aerobic heat exchange system and an air source heat pump system. The regulating tank (10), the anaerobic reactor (20) and the aerobic biological tank (30) are connected in sequence. The aerobic heat exchange system is cyclically connected to the aerobic biological tank (30) to extract the mixed liquid in the aerobic biological tank (30) and exchange heat with the influent water of the anaerobic reactor (20). The air source heat pump system is partially arranged in a fan room (60) and / or the aerobic biological tank (30) to recover the heat in the fan room (60) and / or the aerobic biological tank (30) and heat the influent water of the anaerobic reactor (20).

2. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The aerobic heat exchange system comprises a heat exchanger (41) and a heat exchange pipeline (42); the heat exchanger (41) is arranged on the connecting pipeline between the regulating tank (10) and the anaerobic reactor (20); the heat exchange pipeline (42) comprises a liquid delivery pipe section and a return pipe section; two ends of the liquid delivery pipe section are respectively connected to the heat exchange outlet of the aerobic biological tank (30) and the heat exchange inlet of the heat exchanger (41); two ends of the return pipe section are respectively connected to the heat exchange inlet of the aerobic biological tank (30) and the heat exchange outlet of the heat exchanger (41).

3. The anaerobic heating system for leachate treatment according to claim 2, characterized in that: The aerobic heat exchange system further comprises a cooling circulation pump (43) arranged on the liquid delivery pipe section, so as to extract the mixed liquid in the aerobic biological pool (30) for heat exchange circulation.

4. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The air source heat pump system comprises an evaporator (51), a compressor (52), a condenser (53), an expansion valve (54) and a circulation pipeline (55); the evaporator (51), the compressor (52), the condenser (53) and the expansion valve (54) are connected end to end in sequence through the circulation pipeline (55).

5. The anaerobic heating system for leachate treatment according to claim 4, characterized in that: The condenser (53) is arranged on the connecting pipeline between the regulating tank (10) and the anaerobic reactor (20), the evaporator (51) is arranged in the fan room (60), and the circulation pipeline (55) is filled with a refrigerant. The refrigerant circulates in the circulation pipeline (55) and exchanges heat in the evaporator (51) and the condenser (53).

6. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The anaerobic heating system for leachate treatment further comprises an aeration component, wherein the aeration component is used to aerate the aerobic biological pond (30).

7. The anaerobic heating system for leachate treatment according to claim 6, characterized in that: The aeration assembly comprises an aeration fan (71) and a plurality of aerators (72); the aeration fan (71) is arranged in the fan room (60) and is drivingly connected to the plurality of aerators (72); and the plurality of aerators (72) are arranged at intervals in the aerobic biological pool (30).

8. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The anaerobic heating system for leachate treatment further comprises an anaerobic water inlet pump (80), wherein the anaerobic water inlet pump (80) is arranged on a connecting pipeline between the regulating tank (10) and the anaerobic reactor (20).

9. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The anaerobic heating system for leachate treatment further comprises a steam component, wherein the steam component is in communication with the anaerobic reactor (20) so as to heat the interior of the anaerobic reactor (20).

10. The anaerobic heating system for leachate treatment according to claim 1, characterized in that: The anaerobic heating system for leachate treatment further comprises a circulating water cooling component, wherein the circulating water cooling component is in communication with the aerobic biological pool (30) so as to cool the aerobic biological pool (30).

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