Sewage treatment system and method for recycling waste heat

Abstract

The invention relates to a waste heat recycling sewage treatment system which comprises an upstream treatment tank, a biochemical treatment tank and electromechanical equipment and further comprises a lifting pump, a heat conduction box, an electromagnetic valve, a first temperature sensor, a second temperature sensor and an intelligent control device. A water inlet of the heat conduction box is connected with the lifting pump through a pipeline, and a water outlet of the heat conduction box is connected with the biochemical treatment pond through a pipeline; the lifting pump is arranged in the upstream treatment tank; the electromagnetic valve is arranged on a pipeline between the lifting pump and the heat conduction box; the intelligent control device is connected with the first temperature sensor, the second temperature sensor and the electromagnetic valve. According to the sewage treatment system, sewage exchanges heat with the heat conduction box and then is conveyed to the biochemical treatment pond, waste heat generated by the electromechanical equipment can be converted into water environment temperature required by microorganisms, the heat dissipation problem of the electromechanical equipment is effectively solved, the microorganisms in the biochemical treatment pond are at proper growth temperature, and the water purification efficiency of the microorganisms is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment systems, and in particular relates to a sewage treatment system and method for recycling waste heat. Background Art

[0002] Different types of microorganisms adapt to different environmental temperatures, which are about 5 to 80 degrees. When the temperature exceeds the maximum growth temperature, the protein of the microorganism will denature rapidly and the enzyme system will be destroyed and lose its activity. In severe cases, the microorganism may die. Low temperatures will reduce the metabolic activity of the microorganism, and then the growth and reproduction will stop, but life can be maintained. Conventional sewage treatment plants mainly use the activated sludge method to treat sewage. Generally, most of the microorganisms in the activated sludge method are mesophilic microorganisms. The optimal growth environment temperature for anaerobic mesophilic microorganisms is 25 to 40 degrees (usually controlled at 33 to 38 degrees), and the optimal growth temperature for aerobic mesophilic microorganisms is 20 to 37 degrees.

[0003] In the sewage treatment system, water temperature heating is an important link, especially in cold areas or in winter, by heating the water temperature can ensure the efficiency of microbial water purification. At present, the common heating method is mainly to add heating pipes or use solar energy facilities, and use external heat value to heat the water environment of the sewage treatment system, so as to solve the problem of reduced microbial activity caused by the low temperature environment, such as "Low Temperature Environment Solar Automatic Reflux Heating Sedimentation Filtration Integrated Pool and Control Method" (Application / Patent No.: CN202310597763.8) and "A Device for Strengthening Soil Microbial Remediation Using Solar Circulating Hot Water" (Application / Patent No.: CN201910231747.0), both of which are to add heating pipes or solar energy facilities to increase heat energy for the sewage treatment system or soil remediation system. At present, this method of adding heating pipes or solar energy facilities and using external heat value to heat the water environment of the sewage treatment system requires additional energy input, increases operating costs, and is not energy-saving and environmentally friendly.

[0004] On the other hand, electromechanical equipment such as fans, pump groups, and electronic control units in the sewage treatment system will generate waste heat, and additional cooling fans or air conditioners are needed to dissipate the heat, resulting in energy waste. If this waste heat can be recovered and directly used to heat the water environment of the sewage treatment system, it will greatly reduce energy consumption and save operating costs. Summary of the invention

[0005] The main purpose of the present invention is to propose a sewage treatment system and method for waste heat recovery and utilization, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A waste heat recovery sewage treatment system comprises an upstream treatment tank, a biochemical treatment tank and electromechanical equipment. The sewage is treated in the upstream treatment tank and then transported to the biochemical treatment tank for biochemical treatment. The electromechanical equipment is used to provide the power required for the operation of the sewage treatment system.

[0008] It also includes a lift pump, a heat conduction box, a solenoid valve, a first temperature sensor, a second temperature sensor and an intelligent control device;

[0009] The heat conduction box is used to absorb the heat of the electromechanical equipment, and its water inlet is connected to the lifting pump through a pipeline, and its water outlet is connected to the biochemical treatment pool through a pipeline;

[0010] The lifting pump is arranged in the upstream treatment tank, and is used to transport the sewage treated in the upstream treatment tank to the heat transfer box, and the sewage is then transported to the biochemical treatment tank after heat exchange in the heat transfer box;

[0011] The solenoid valve is arranged on the pipeline between the lift pump and the heat conduction box, and is used to control the circulation of sewage;

[0012] The first temperature sensor is used to monitor the temperature of the electromechanical equipment in real time;

[0013] The second temperature sensor is used to monitor the temperature of the sewage in the biochemical treatment pool in real time;

[0014] The intelligent control device is connected to the first temperature sensor, the second temperature sensor and the solenoid valve respectively, and is used to control the opening and closing of the solenoid valve according to the temperature monitored by the first temperature sensor and the second temperature sensor.

[0015] Preferably, the heat conduction box is composed of heat conduction plates, the water inlet and outlet of the heat conduction box are both provided with guide pipes, the guide pipes are provided with flexible joints, and a plurality of guide plates are alternately arranged in the cavity of the heat conduction box to form an internal flow channel through the plurality of guide plates.

[0016] Preferably, the guide plate has a slope.

[0017] Preferably, the bottom of the heat conduction box is provided with rollers, and the side of the heat conduction box is provided with handles.

[0018] Preferably, a check valve is also provided on the pipeline between the lift pump and the heat conduction box.

[0019] Preferably, a gate valve is also provided on the pipeline between the lift pump and the heat conduction box.

[0020] A method for treating wastewater by recycling waste heat, using any of the wastewater treatment systems described above, further comprising the following steps:

[0021] S1: The heat transfer box absorbs the waste heat generated by the electromechanical equipment;

[0022] S2: The lifting pump transports the sewage treated in the upstream treatment tank to the heat transfer box. When the sewage flows through the heat transfer box, it exchanges heat with the heat transfer box.

[0023] S3: After heat exchange, the sewage temperature increases and is finally transported to the biochemical treatment pool for biochemical treatment;

[0024] S4: The first temperature sensor monitors the temperature of the electromechanical equipment in real time and transmits the temperature signal to the intelligent control device. The second temperature sensor monitors the temperature of the sewage in the biochemical treatment pool in real time and transmits the temperature signal to the intelligent control device. The intelligent control device controls the opening and closing of the solenoid valve according to the temperatures monitored by the first temperature sensor and the second temperature sensor.

[0025] The present invention provides a waste heat recovery sewage treatment system and method, which has the following beneficial effects:

[0026] 1. This sewage treatment system exchanges heat between sewage and the heat transfer box and then transports it to the biochemical treatment pool. It can convert the waste heat generated by electromechanical equipment into the water environment temperature required by microorganisms, which not only effectively solves the heat dissipation problem of electromechanical equipment, but also keeps the microorganisms in the biochemical treatment pool at a suitable growth temperature, ensuring the water purification efficiency of microorganisms. Through this sewage treatment system, the heat inside the system can be fully utilized without the need to add additional heating and cooling systems, thereby reducing energy consumption and saving operating costs.

[0027] 2. The sewage treatment system is also provided with a solenoid valve, a first temperature sensor, a second temperature sensor and an intelligent control device. The first temperature sensor monitors the temperature of the electromechanical equipment in real time and transmits the temperature signal to the intelligent control device. The second temperature sensor monitors the temperature of the sewage in the biochemical treatment pool in real time and transmits the temperature signal to the intelligent control device. The intelligent control device controls the opening and closing of the solenoid valve according to the temperature monitored by the first temperature sensor and the second temperature sensor, thereby controlling the circulation of sewage and realizing automatic management and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the sewage treatment system of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the heat conduction box of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of Example 1 of the present invention.

[0031] In the figure: 1. Upstream treatment tank; 2. Biochemical treatment tank; 3. Electromechanical equipment; 4. Lifting pump; 5. Heat transfer box; 51. Heat transfer plate; 52. Cavity; 53. Guide pipe; 54. Union joint; 55. Guide plate; 56. Handle; 57. Roller; 6. Solenoid valve; 7. First temperature sensor; 8. Second temperature sensor; 9. Intelligent control device; 10. Check valve; 11. Gate valve; 100. Water inlet regulating tank; 200. Sewage treatment equipment; 300. Fan; 400. Valve well; 500. Fan cover. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Reference Figure 1-2A waste heat recovery sewage treatment system includes an upstream treatment pool 1, a biochemical treatment pool 2 and an electromechanical device 3. After being treated in the upstream treatment pool 1, the sewage is transported to the biochemical treatment pool 2 for biochemical treatment. The electromechanical device 3 is used to provide the power required for the operation of the sewage treatment system.

[0037] Among them, the upstream treatment tank 1 is a sewage treatment tank in the front process of the biochemical treatment tank 2, including an inlet regulating tank, a sedimentation tank, a flotation tank, etc., and the upstream treatment tank 1 can be one or more of them. The biochemical treatment tank 2 is a sewage treatment tank that uses the metabolic activities of microorganisms to remove organic matter and nutrients in sewage, including an anaerobic tank, an anoxic tank, an aerobic tank, etc., and the biochemical treatment tank 2 can be one or more of them. The electromechanical equipment 3 includes fans, pump groups, electronic control units and other equipment, which provide power for the operation of the sewage treatment system and generate waste heat.

[0038] The sewage treatment system of the present invention further includes a lift pump 4 , a heat conduction box 5 , a solenoid valve 6 , a first temperature sensor 7 , a second temperature sensor 8 and an intelligent control device 9 .

[0039] The heat transfer box 5 is used to absorb the heat of the electromechanical equipment 3, and its water inlet is connected to the lifting pump 4 through a pipeline, and its water outlet is connected to the biochemical treatment tank 2 through a pipeline; wherein, the heat transfer box 5 can select different heat collection methods according to the structural form of the electromechanical equipment 3. For the case where the electromechanical equipment 3 itself has a high degree of integration and mainly dissipates heat on one side, a group of heat transfer boxes 5 can be installed close to its heat dissipation surface. For the case where the electromechanical equipment 3 dissipates heat evenly, multiple groups of heat transfer boxes 5 can be installed close to each other or a hood-type structure can be selected to collect the entire heat source and then transfer it to the heat transfer box 5.

[0040] The lifting pump 4 is arranged in the upstream treatment tank 1 , and is used to transport the sewage treated in the upstream treatment tank 1 to the heat transfer box 5 . The sewage is then transported to the biochemical treatment tank 2 after heat exchange in the heat transfer box 5 .

[0041] The solenoid valve 6 is arranged on the pipeline between the lift pump 4 and the heat transfer box 5 to control the circulation of sewage.

[0042] The first temperature sensor 7 is used to monitor the temperature of the electromechanical device 3 in real time. The first temperature sensor 7 can be directly connected to the electromechanical device 3 or be arranged in the environment where the electromechanical device 3 is located, depending on the heat collection method.

[0043] The second temperature sensor 8 is used to monitor the temperature of sewage in the biochemical treatment tank 2 in real time, and is located in the biochemical treatment tank 2 .

[0044] The intelligent control device 9 is connected to the first temperature sensor 7 , the second temperature sensor 8 and the solenoid valve 6 respectively, and is used to control the opening and closing of the solenoid valve 6 according to the temperatures monitored by the first temperature sensor 7 and the second temperature sensor 8 .

[0045] When the sewage treatment system is in operation, the heat transfer box 5 absorbs the waste heat generated by the electromechanical equipment 3, and the lifting pump 4 transports the sewage treated in the upstream treatment tank 1 to the heat transfer box 5. When the sewage flows through the heat transfer box 5, it exchanges heat with the heat transfer box 5. After the heat exchange, the sewage temperature increases and is finally transported to the biochemical treatment tank 2 for biochemical treatment.

[0046] The sewage treatment system exchanges heat between the sewage and the heat transfer box 5 and then transports it to the biochemical treatment pool 2. It can convert the waste heat generated by the electromechanical equipment 3 into the water environment temperature required by the microorganisms, which not only effectively solves the heat dissipation problem of the electromechanical equipment 3, but also makes the microorganisms in the biochemical treatment pool 2 at a suitable growth temperature, ensuring the water purification efficiency of the microorganisms. Through the sewage treatment system, the heat inside the system can be fully utilized without the need to add additional heating systems and heat dissipation systems, thereby reducing energy consumption and saving operating costs.

[0047] In addition, the sewage treatment system is also provided with a solenoid valve 6, a first temperature sensor 7, a second temperature sensor 8 and an intelligent control device 9. The first temperature sensor 7 monitors the temperature of the electromechanical equipment 3 in real time and transmits the temperature signal to the intelligent control device 9. The second temperature sensor 8 monitors the temperature of the sewage in the biochemical treatment tank 2 in real time and transmits the temperature signal to the intelligent control device 9. The intelligent control device 9 controls the opening and closing of the solenoid valve 6 according to the temperature monitored by the first temperature sensor 7 and the second temperature sensor 8, thereby controlling the circulation of sewage and realizing automatic management and control.

[0048] In a specific embodiment, the heat conduction box 5 is composed of a heat conduction plate 51, and the water inlet and outlet of the heat conduction box 5 are both provided with a guide pipe 53, and the guide pipe 53 is provided with a flexible joint 54 to facilitate pipeline connection. A plurality of guide plates 55 are arranged alternately in the cavity 52 of the heat conduction box 5, and an internal flow channel is formed by the plurality of guide plates 55, which increases the time for sewage to flow through the heat conduction box 5 and fully performs heat exchange.

[0049] In a specific embodiment, the guide plate 55 has a slope, and the slope of the plate surface is 1% to avoid sludge accumulation and blockage of the flow channel.

[0050] In a specific embodiment, a roller 57 is provided at the bottom of the heat conducting box 5 , and a handle 56 is provided on the side of the heat conducting box 5 to facilitate installation and removal of the heat conducting box 5 .

[0051] In a specific implementation scheme, a check valve 10 is also provided on the pipeline between the lifting pump 4 and the heat transfer box 5 to prevent sewage from flowing back.

[0052] In a specific implementation manner, a gate valve 11 is further provided on the pipeline between the lift pump 4 and the heat transfer box 5 to further control the circulation of sewage.

[0053] The sewage treatment system is not limited by the construction form or the main process, and can be widely used in above-ground, semi-underground and above-ground structures, existing mature, emerging or improved processes, as well as new construction and renovation projects. It does not require large-scale demolition and reconstruction, and is further explained with specific embodiments below.

[0054] Example 1

[0055] Reference Figure 3 , with a processing scale of ≤500m 3 / d's decentralized small-scale underground sewage treatment equipment is taken as an example and modified. The decentralized small-scale underground sewage treatment equipment itself includes an inlet regulating tank 100 (i.e., an upstream treatment tank 1), a sewage treatment equipment 200 (i.e., a biochemical treatment tank 2), a fan 300 (i.e., an electromechanical equipment 3) and a valve well 400. The sewage treatment equipment 200 is an integrated device of an anaerobic tank, an anoxic tank and an aerobic tank. The outdoor temperature in winter is -5 to 10, and the microbial water environment temperature is 4 to 10; the outdoor temperature in summer is 30 to 40, and the microbial water environment temperature is 17 to 23; the normal working temperature range of the fan 300 is 30 to 90.

[0056] On the basis of the above structure, a lifting pump 4 is added to the water inlet regulating tank 100, and a fan cover 500 is used to cover the fan 300. A heat conduction box 5 is arranged in the fan cover 500. The water inlet of the heat conduction box 5 is connected to the lifting pump 4 through a pipeline, and the water outlet is connected to the sewage treatment equipment 200 through a pipeline. A solenoid valve 6, a gate valve 11 and a check valve 10 are arranged on the pipeline between the lifting pump 4 and the heat conduction box 5. The solenoid valve 6, the gate valve 11 and the check valve 10 are all arranged in the valve well 400. A first temperature sensor 7, a second temperature sensor 8 and an intelligent control device 9 are further arranged. The intelligent control device 9 is respectively connected to the first temperature sensor 7, the second temperature sensor 8 and the solenoid valve 6. It is worth mentioning that the transformation can retain the original sewage transportation path from the water inlet regulating tank 100 to the sewage treatment equipment 200.

[0057] When the decentralized small-scale underground sewage treatment equipment is in operation, the heat transfer box 5 absorbs the waste heat generated by the fan 300, and the lifting pump 4 transports the sewage treated by the water inlet regulating tank 100 to the heat transfer box 5. When the sewage flows through the heat transfer box 5, it exchanges heat with the heat transfer box 5, and the sewage temperature is increased. Finally, it is transported to the sewage treatment equipment 200 for biochemical treatment. The decentralized small-scale underground sewage treatment equipment can convert the waste heat generated by the fan 300 into the water environment temperature required by microorganisms, which not only effectively solves the problem of heat dissipation of the fan 300, but also makes the microorganisms in the sewage treatment equipment 200 at a suitable growth temperature, thereby ensuring the water purification efficiency of the microorganisms.

[0058] The first temperature sensor 7 monitors the temperature of the fan 300 in real time and transmits the temperature signal to the intelligent control device 9. The second temperature sensor 8 monitors the temperature of the sewage in the sewage treatment equipment 200 in real time and transmits the temperature signal to the intelligent control device 9. The intelligent control device 9 controls the opening and closing of the solenoid valve 6 according to the temperatures monitored by the first temperature sensor 7 and the second temperature sensor 8, thereby controlling the circulation of the sewage and realizing automatic management and control.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 invention.

Claims

1. A waste heat recovery sewage treatment system, comprising an upstream treatment tank, a biochemical treatment tank and electromechanical equipment. The sewage is treated in the upstream treatment tank and then transported to the biochemical treatment tank for biochemical treatment. The electromechanical equipment is used to provide the power required for the operation of the sewage treatment system, characterized in that: It also includes a lift pump, a heat conduction box, a solenoid valve, a first temperature sensor, a second temperature sensor and an intelligent control device; The heat conduction box is used to absorb the heat of the electromechanical equipment, and its water inlet is connected to the lifting pump through a pipeline, and its water outlet is connected to the biochemical treatment pool through a pipeline; The lifting pump is arranged in the upstream treatment tank, and is used to transport the sewage treated in the upstream treatment tank to the heat transfer box, and the sewage is then transported to the biochemical treatment tank after heat exchange in the heat transfer box; The solenoid valve is arranged on the pipeline between the lift pump and the heat conduction box, and is used to control the circulation of sewage; The first temperature sensor is used to monitor the temperature of the electromechanical equipment in real time; The second temperature sensor is used to monitor the temperature of the sewage in the biochemical treatment pool in real time; The intelligent control device is connected to the first temperature sensor, the second temperature sensor and the solenoid valve respectively, and is used to control the opening and closing of the solenoid valve according to the temperature monitored by the first temperature sensor and the second temperature sensor.

2. A wastewater treatment system for waste heat recovery and utilization according to claim 1, characterized in that: The heat conduction box is composed of heat conduction plates. The water inlet and outlet of the heat conduction box are both provided with guide pipes. The guide pipes are provided with flexible joints. Several guide plates are staggeredly arranged in the cavity of the heat conduction box to form an internal flow channel through the guide plates.

3. A wastewater treatment system for waste heat recovery and utilization according to claim 2, characterized in that: The guide plate has a slope.

4. A wastewater treatment system for waste heat recovery and utilization according to claim 1, characterized in that: The bottom of the heat conduction box is provided with rollers, and the side of the heat conduction box is provided with handles.

5. The wastewater treatment system for waste heat recovery and utilization according to claim 1, characterized in that: A check valve is also provided on the pipeline between the lift pump and the heat conduction box.

6. The wastewater treatment system for waste heat recovery and utilization according to claim 1, characterized in that: A gate valve is also provided on the pipeline between the lift pump and the heat conduction box.

7. A wastewater treatment method for waste heat recovery, using the wastewater treatment system according to any one of claims 1 to 6, characterized in that: The following steps are also included: S1: The heat transfer box absorbs the waste heat generated by the electromechanical equipment; S2: The lifting pump transports the sewage treated in the upstream treatment tank to the heat transfer box. When the sewage flows through the heat transfer box, it exchanges heat with the heat transfer box. S3: After heat exchange, the sewage temperature increases and is finally transported to the biochemical treatment pool for biochemical treatment; S4: The first temperature sensor monitors the temperature of the electromechanical equipment in real time and transmits the temperature signal to the intelligent control device. The second temperature sensor monitors the temperature of the sewage in the biochemical treatment pool in real time and transmits the temperature signal to the intelligent control device. The intelligent control device controls the opening and closing of the solenoid valve according to the temperatures monitored by the first temperature sensor and the second temperature sensor.

Images