A wastewater treatment system coupled with solar PV / T-driven photocatalysis and microbial degradation

Abstract

This invention discloses a wastewater treatment system coupled with a solar PV / T-driven photocatalytic and microbial degradation method. This system can degrade dibutyl phthalate (DBP), a recalcitrant substance in wastewater, while simultaneously generating electricity and heat. The system includes a solar PV / T module, a photocatalytic module, and a bioreactor module. The solar PV / T module and the photocatalytic module are integrated into one unit. The PV / T module includes a substrate, an EVA material layer, photovoltaic cells, a solar collector, water pipes, a battery, an inverter, and a hot water storage tank. The photocatalytic module includes a photocatalytic reactor and a pollutant concentration sensor. This invention couples photocatalysis with a microbial method, utilizing renewable solar energy for wastewater treatment. Simultaneously, it couples the wastewater treatment system with a wastewater treatment plant, fully utilizing the electricity and heat generated by the photovoltaic cells within the wastewater treatment plant. Furthermore, when solar irradiance is insufficient, waste heat and electricity from the wastewater treatment plant are connected to the system to ensure normal operation, creating a complementary system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of solar photovoltaic / thermal (PV / T) technology purification, and particularly relates to a solar PV / T driven photocatalytic method and microbial degradation method coupled sewage treatment system. The sewage treatment system can be used for removal of the difficult-to-degrade pollutant dibutyl phthalate in water bodies, and can simultaneously generate electric energy and heat energy for use of the system and sewage treatment plants. BACKGROUND

[0002] Dibutyl phthalate (DBP) is one of the most important plasticizers in the plastic industry, and is widely used in food packaging materials, containers, medical devices and children's toys, etc. DBP is mainly combined with polymers in plastic products through hydrogen bonds and van der Waals forces, and thus is easily released into the atmosphere, soil, water bodies and sediments during production, use and treatment, etc. Studies have shown that as an environmental endocrine disruptor, DBP can cause liver enlargement, osteoporosis, weight loss, and other chronic diseases such as skin cancer and thymic cancer that cannot be ignored.

[0003] At present, a certain content of DBP has been generally detected in many river water bodies and sediments in China, which has attracted widespread attention. Studies have shown that DBP is a difficult-to-degrade substance, and its hydrolysis and photolysis rates in the natural environment are very slow; although microbial degradation can convert DBP into harmless substances or completely mineralize, the biological degradation of DBP is not complete, and toxic intermediate metabolites can be produced, or the degradation rate cannot meet the requirements of actual pollution control. Therefore, a more efficient and perfect degradation method needs to be selected.

[0004] Titanium dioxide has great potential in photocatalytic degradation of organic pollutants. Studies have shown that under ultraviolet light irradiation, TiO2 can effectively catalyze the degradation of DBP in wastewater, because under ultraviolet light, the valence band electrons of TiO2 can be excited to form holes and electrons, and the holes and electrons can react with H2O on the surface of TiO2 and O2 in the air to generate ·OH and highly active groups, thereby oxidizing and degrading DBP. The intermediates in the degradation process are gradually degraded into benzoic acid, and benzoic acid can be removed by microbial degradation.

[0005] Solar energy is a clean, efficient and inexhaustible renewable energy, and its utilization methods are various. Solar photothermal utilization and solar photovoltaic power generation are the main development directions of current solar energy utilization. The solar PV / T system is a hybrid compact integrated system that can realize electric energy generation and heat energy recovery, and the combination of the PV / T module and the photocatalytic module can simultaneously meet the degradation and treatment of pollutants in wastewater, and the entire electric energy and heat energy demand of the sewage treatment system and the partial electric energy and heat energy demand of the sewage treatment plant.

[0006] Therefore, the present application combines a solar PV / T module, a photocatalytic module and a bioreactor to provide a PV / T driven photocatalytic method and microbial degradation method coupled sewage treatment system, which can not only efficiently degrade DBP or other pollutants in water through synergistic effect, but also generate electric energy and heat energy through PV / T technology, wherein the electric energy is used for electrical equipment such as water pump in the system, and the heat energy is used for heating water to achieve degradation temperature requirement of water, so as to realize efficient utilization of solar energy. Meanwhile, the sewage treatment system is coupled with a sewage treatment plant, and the electric energy and heat energy generated by the system and the waste heat and electricity of the sewage plant can be utilized mutually to form complementation. SUMMARY

[0007] In view of the shortcomings of the existing methods for degrading dibutyl phthalate, such as very slow hydrolysis and photolysis speed in natural environment, incomplete microbial degradation, generation of intermediate metabolites with higher toxicity, or degradation rate that cannot meet the actual pollution control requirement, the present application provides a solar PV / T driven photocatalytic method and microbial degradation method coupled sewage treatment system, which can effectively remove DBP in sewage while generating electricity and heat.

[0008] The technical scheme adopted by the present application is as follows:

[0009] A wastewater treatment system coupled with a solar PV / T-driven photocatalytic degradation method and a microbial degradation method includes a PV / T module, a planar photocatalytic module, and a bioreactor module. The PV / T module includes a substrate, an EVA material layer, photovoltaic cells, water pipes, a cold inlet, a hot outlet, a solar collector, a battery, an inverter, and a hot water storage tank. The photocatalytic module includes a photocatalytic reactor and a pollutant concentration sensor. The photovoltaic cells of the PV / T module are conventionally packaged and bonded to the upper photocatalytic reactor glass and the lower substrate using an ethylene-vinyl acetate copolymer (EVA) organic adhesive film for power generation and heat generation. The photovoltaic cells are crystalline silicon cells with a thickness of 0.4 mm to 0.9 mm and a power generation efficiency of 20% to 30%, enabling the photovoltaic module to generate electricity normally. Water pipes and solar collector pipes are located on the back of the photovoltaic cells. The water pipes are used to preheat the wastewater entering from the wastewater tank and remove some of the heat generated by the photovoltaic cells during operation. The solar collector is used to collect the thermal energy from the photovoltaic cells. The energy is transmitted to the hot water storage tank via connecting pipes; the temperature sensor is used to detect the water temperature; the battery is used to store the electrical energy generated by the photovoltaic cell; the photocatalytic reactor is made of heat-resistant ultraviolet-transmitting high-transmittance borosilicate glass, on which a TiO2 film is loaded; the TiO2 film is semi-transparent, with an ultraviolet light absorption rate of 90% to 92%, allowing visible light (VL) to pass through the TiO2 film so that the photovoltaic module can generate electricity normally, reacting rapidly to ultraviolet light (UV) in sunlight, catalytically degrading pollutants in the water, and also allowing infrared light (IR) in sunlight to be absorbed by the water.

[0010] Furthermore, the cold inlet of the PV / T module is connected to a wastewater tank, and the hot outlet is connected to a photocatalytic reactor. Wastewater containing a certain concentration of DBP enters the water pipe welded to the back of the battery through the cold inlet. After being preheated in the water pipe, it enters the photocatalytic reactor, where DBP is degraded into benzoic acid by ultraviolet light and TiO2. The solar collector is used to collect the heat energy of the photovoltaic cells and transfer it to the hot water storage tank through connecting pipes to heat the wastewater in the tank after photocatalytic degradation. When the wastewater in the hot water storage tank reaches a certain temperature, it enters the bioreactor where thermophilic bacteria carry out microbial degradation of benzoic acid.

[0011] Furthermore, the electrical energy generated by the PV / T module is connected to the battery via transmission lines to supply power to electrical equipment such as water pumps in the system. At the same time, the battery is connected to the inverter, which is connected to the power grid and connected to the sewage treatment plant section to supply power to the sewage treatment plant section. The generated heat energy is used to heat the sewage to ensure that the water temperature is high enough for the surrounding biological processes in the bioreactor. Meanwhile, the sewage treated by the system has a certain amount of heat, which is exchanged through a heat exchanger and supplied to the sewage treatment plant section.

[0012] Furthermore, when solar irradiance is sufficient, the electrical energy generated by the PV / T module supplies power to the electrical equipment in the system, and is also connected to the power grid via a battery-connected inverter to supply power to the wastewater treatment plant. The generated heat energy supplies the hot water storage tank to heat the water and is also supplied to the wastewater treatment plant via a heat exchanger. When solar irradiance is insufficient, the electrical energy generated by the PV / T module is stored in the battery, the waste heat and electricity from the wastewater treatment plant are fed into the system, sludge digestion generates electricity through methane power generation to power the system, and the heat pump system in the wastewater treatment plant can provide heat to the system, ensuring the normal operation of the system.

[0013] The beneficial technical effects of this invention are reflected in the following aspects:

[0014] 1. This system couples photocatalytic and microbial methods for the artificial degradation of DBP, combining the advantages of rapid photocatalytic degradation and low-cost, high-efficiency biodegradation, thus achieving efficient and complete degradation of the recalcitrant pollutant DBP. Besides DBP, this system can also be used to degrade other pollutants in water bodies.

[0015] 2. While utilizing renewable energy for pollutant water treatment, the system also generates electricity and heat through solar PV / T modules. The generated electricity supplies electrical equipment in the system and wastewater treatment plant, while the generated heat is used to heat the water, ensuring it reaches a certain temperature for use in the bioreactor and for the wastewater treatment plant. This improves the utilization rate of solar energy and achieves the goals of low carbon emissions and high returns.

[0016] 3. The wastewater treatment system is coupled with the wastewater treatment plant. When there is sufficient solar radiation, the PV / T module in the system generates electricity and heat to supply the wastewater treatment plant. When there is insufficient solar radiation, the waste heat and electricity from the wastewater treatment plant are connected to the system to ensure the electricity and heat required for the system to operate.

[0017] In summary, this invention applies solar PV / T technology to wastewater treatment systems, combining PV / T modules, photocatalytic modules, and bioreactors. Through the synergistic treatment of photocatalysis and microorganisms, pollutants in water are efficiently removed. Simultaneously, it achieves efficient utilization of clean energy, thus saving energy and reducing carbon emissions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure and process of a wastewater treatment system coupled with a solar PV / T-driven photocatalytic method and a microbial degradation method according to the present invention.

[0019] Figure 2 This is a layout diagram showing the combination of the photocatalytic module and the PV / T module of the present invention;

[0020] Figure 3 This is a schematic diagram of the bioreactor structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the back structure of the photovoltaic cell of the present invention.

[0022] In the diagram: 1-Sewage tank, 2-Water pump, 3-Photocatalytic reactor, 4-TiO2 photocatalytic coating, 5-Pollutant concentration sensor, 6-EVA material layer, 7-Photovoltaic cell, 8-Substrate, 9-Battery, 10-Inverter, 11-Power grid, 12-Heat meter, 13-Hot water storage tank, 14-Temperature sensor, 15-Bioreactor, 16-Effluent pump, 17-Heat exchanger, 18-Heat pump system, 19-Domestic water for sewage treatment plant, 20-Sludge digestion tank, 21-Part of sewage treatment plant, 22-Concentration meter, 23-Check valve, 24-Level controller, 25-Valve, 26-Heat collector, 27-Water pipe, 28-Cold inlet, 29-Hot outlet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] like Figures 1-4As shown, this invention discloses a wastewater treatment system coupled with a solar PV / T-driven photocatalytic degradation method and a microbial degradation method, comprising a PV / T module, a photocatalytic module, and a bioreactor module. The PV / T module includes a substrate 8, an EVA material layer 6, photovoltaic cells 7, a solar collector 26, a water pipe 27, a cold water inlet 28, a hot water outlet 29, a battery 9, an inverter 10, and a hot water storage tank 13. One end of the water pipe 27 is provided with a cold water inlet 28, and the other end is provided with a hot water outlet 29. The photocatalytic module includes a photocatalytic reactor 3 and a pollutant concentration sensor 5; the bioreactor module includes a bioreactor 15. The cold inlet of the PV / T module is connected to the sewage tank 1 via water pump 2, and the hot outlet 29 is connected to the photocatalytic reactor 3. Sewage enters the water pipe welded to the back of the photovoltaic cell 7 through the cold inlet 28, and after being preheated in the water pipe 27, it enters the photocatalytic reactor 3. Pollutants in the water are photocatalytically oxidized and degraded in the photocatalytic reactor 3. The photocatalytically oxidized and degraded sewage enters the hot water storage tank 13. The collector 26 is used to collect the heat energy of the photovoltaic cell 7. The collector 26 is equipped with a heat collection pipe and is a heat collection plate. One end of the heat collection pipe of the collector 26 is connected to the water source, and the other end is connected to a pipe that returns to the water source. The connecting pipe is set on the surface of the hot water storage tank and exchanges heat with the hot water storage tank through the connecting pipe, transferring heat to the hot water storage tank 13 to heat the photocatalytically degraded sewage in the hot water storage tank 13. When the sewage in the hot water storage tank 13 reaches the predetermined temperature, it enters the bioreactor 15 where thermophilic microorganisms completely degrade the pollutants. A heat meter 12 is installed on the connecting pipe between the solar collector 26 and the hot water storage tank 13. The photocatalytic reactor 3 is made of heat-resistant, ultraviolet-transmitting, high-transmittance borosilicate glass, with a TiO2 photocatalytic coating 4 loaded on it. The battery 9 is connected in sequence to the inverter 10 and the power grid 11. The power grid 11 is connected to the sewage treatment plant section 21.

[0025] Wastewater is pumped from the outlet on the right side of wastewater tank 1 to the PV / T module via water pump 2. The photovoltaic cells 7 in the PV / T module have water pipes 27 on their backs. Wastewater enters the water pipes 27 for preheating, and then flows through the outlet of the water pipes 27 into the photocatalytic reactor 3 for photocatalytic degradation. The photocatalytic reactor 3 is directly connected to the inlet of a hot water storage tank 13 via a pipeline, and the outlet of the hot water storage tank 13 is connected to a bioreactor 15. The solar PV / T module includes photovoltaic cells 7, a battery 9, and an inverter 10. The battery 9 stores electrical energy; the inverter 10 outputs mains power and can be connected to the grid 11, with an output voltage suitable for various conventional mains-powered devices. The photovoltaic cells 7 are connected to the battery 9; the battery 9 is connected in sequence to the inverter 10 and the grid 11. A plate-type solar collector 26 with heat collection pipes is also installed on the back of the photovoltaic cells 7, featuring a simple structure and high thermal absorption efficiency. Sunlight shines on the photocatalytic reactor 3 and, after passing through the upper glass cover, the ultraviolet light is absorbed by the TiO2 photocatalytic coating 4 to carry out a catalytic reaction. Most of the visible light triggers the photoelectric effect on the photovoltaic cells 7, converting it into electrical energy output. The remaining portion of light that cannot induce electron transitions is converted into heat on the surface of the solar panels, causing the panel temperature to rise. Infrared light is absorbed by the wastewater in the photocatalytic reactor 3, raising the wastewater temperature. The electrical energy generated by the solar PV / T module supplies some electrical equipment in the system and can also be connected to the grid 11. The heat energy generated when the solar PV / T module is working is absorbed by the collector 26 and transferred to the hot water storage tank 13.

[0026] By coupling photocatalysis with microbial methods, pollutants in water are synergistically degraded and treated; at the same time, power and heat are generated; and the system is coupled with a sewage treatment plant, so that the electrical and thermal energy generated by the system can be mutually utilized with the waste heat and electricity of part 21 of the sewage treatment plant, forming a complementary relationship.

[0027] like Figure 1The diagram shows the structure and flow chart of a wastewater treatment system coupled with a solar PV / T-driven photocatalytic degradation method according to the present invention. The cold inlet 28 of the PV / T module is directly connected to the wastewater tank 1, and the hot outlet 29 is connected to the photocatalytic reactor 3. Wastewater enters the water pipe 27 welded to the back of the photovoltaic cell 7 through the cold inlet 28, is preheated in the water pipe 27, and then enters the photocatalytic reactor 3, where pollutants are photocatalytically oxidized. The collector 26 collects the heat energy from the photovoltaic cell 7 and transfers it to the hot water storage tank 13 through a connecting pipe to heat the photocatalytically degraded wastewater in the hot water storage tank 13. The collector 26 is a plate collector, and a heat collection pipe can be installed on the back of the photovoltaic cell 7. When the wastewater in the hot water storage tank reaches 40°C, it enters the bioreactor 15 where thermophilic microorganisms completely degrade the pollutants. A heat meter 12 is installed on the connecting pipe between the collector 26 and the hot water storage tank 13. A temperature sensor 14 is installed on the hot water storage tank 13. The photocatalytic reactor 3 is equipped with a pollutant concentration sensor 5. When solar irradiance is sufficient, the electricity generated by the solar PV / T module supplies the electrical equipment in the system and the wastewater treatment plant, while the generated heat supplies the water body and areas requiring heat within the wastewater treatment plant section 21. When solar irradiance is insufficient, the electricity generated by the PV / T module is stored in the battery 9. Waste heat and electricity from the wastewater treatment plant section 21 are connected to the wastewater treatment system. The sludge digestion tank 20 supplies power to the wastewater treatment system via methane generators. The heat pump system 18 in the wastewater treatment plant section 21 heats the hot water storage tank 13, ensuring the water temperature in the tank exceeds 30°C and guaranteeing normal system operation. The wastewater treatment plant section 21 includes a heat exchanger 17, a heat pump system 18, domestic water supply 19, and a sludge digestion tank 20.

[0028] like Figure 2The diagram shows the arrangement of the photocatalytic module and the PV / T module in a wastewater treatment system that couples solar PV / T-driven photocatalysis with microbial degradation, according to the present invention. The photovoltaic cell 7 is conventionally packaged and bonded to the glass of the upper photocatalytic reactor 3 and the lower substrate 8 via an EVA material layer 6 (i.e., EVA organic film). The photovoltaic cell 7 is a crystalline silicon cell with a thickness of 0.4mm to 0.9mm and a power generation efficiency of 20% to 30%. It has a water pipe 27 and a heat collection pipe on its back. The photocatalytic reactor 3 is made of heat-resistant, ultraviolet-transmitting, high-transmittance borosilicate glass, on which a TiO2 film is loaded. The TiO2 film is a TiO2 photocatalytic coating 4. The TiO2 film is semi-transparent with an ultraviolet light absorption rate of 90% to 92%, allowing visible light (VL) to pass through and enabling the photovoltaic module to generate electricity normally. It reacts rapidly to ultraviolet (UV) light from sunlight, catalyzing the degradation of pollutants in water, while also allowing infrared (IR) light from sunlight to be absorbed by the water. The transmission line is 30-36AWG (American Wire). The wires are Gauge (American wire specification) with a rated current of 5mA to 20mA; the battery 9 is a 12V, 40Ah specification, a gel battery specifically for solar energy, which provides more stable output current and voltage.

[0029] like Figure 3 As shown, this invention relates to a bioreactor in a wastewater treatment system coupled with solar PV / T-driven photocatalysis and microbial degradation. When the pollutant concentration in the water of the photocatalytic reactor 3 and the temperature of the water in the hot water storage tank 13 reach certain requirements, the wastewater enters the bioreactor module for further microbial degradation. After degradation, the heat is transferred out through the heat exchanger 17 and supplied to the wastewater treatment plant's domestic water supply 19. An effluent pump 16 is installed on the connecting pipe between the hot water storage tank 13 and the heat exchanger 17. A concentration meter 22 is installed at the outlet of the bioreactor 15. If the water treatment is not up to standard, the water is recycled back into the bioreactor 15 for microbial degradation. The hot water storage tank 13 is connected to the bioreactor 15, and a valve 25 is installed on the connecting pipe between the hot water storage tank 13 and the bioreactor 15. The outlet of the bioreactor 15 is divided into two paths. The first path is connected to the effluent pump 16 and the heat exchanger 17 in sequence, and a concentration meter 22 is installed on the first path. The second path returns to the bioreactor 15 and a check valve 23 is installed on the second path. A level controller 24 is installed on the bioreactor 15.

[0030] Under actual operating conditions, with sufficient solar irradiance, the water temperature in the hot water storage tank reaches 40°C after UV / TiO2 photocatalytic degradation, matching the bacterial growth temperature in bioreactor 15. After 3 hours, the degradation rate of dibutyl phthalate in the wastewater can reach 90%–95%, and the water temperature in the hot water storage tank 13 can reach up to 60°C under good weather conditions. This invention's wastewater treatment system uses a photocatalytic method for artificially degrading pollutants in conjunction with a microbial method to treat wastewater, forming a photocatalytic-coupled microbial system. After photocatalysis, the pollutants can be directly degraded by microorganisms. First, photocatalytic materials are used under light conditions to convert recalcitrant pollutants in wastewater into biodegradable intermediates. Then, microorganisms completely metabolize the photocatalytic reaction intermediates into carbon dioxide and water, ultimately achieving enhanced treatment of recalcitrant wastewater. The coupled system avoids problems such as energy waste and low bioavailability of products caused by over-catalytic treatment, while also avoiding problems such as high biotoxicity of products caused by under-catalytic treatment, thus better coordinating the interaction between photocatalytic materials and microorganisms. Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A solar PV / T driven photocatalytic process coupled with microbial degradation process for wastewater treatment system characterized by: The application relates to a PV / T module, a photocatalytic module and a bioreactor module, wherein the PV / T module comprises a substrate (8), an EVA material layer (6), a photovoltaic cell (7), a heat collector (26), a water pipe (27), a cold water inlet (28), a hot water outlet (29), a storage battery (9), an inverter (10) and a heat storage water tank (13); the photocatalytic module comprises a photocatalytic reactor (3) and a pollutant concentration sensor (5); the bioreactor module comprises a bioreactor (15); the cold water inlet in the PV / T module is connected with a sewage pool (1), the hot water outlet (29) is connected with the photocatalytic reactor (3), sewage enters the water pipe (27) welded on the back of the photovoltaic cell (7) from the cold water inlet (28), is preheated in the water pipe (27) and then enters the photocatalytic reactor (3), and pollutants in the water body are photocatalytically oxidized and degraded in the photocatalytic reactor (3); the heat collector (26) is used for collecting the heat energy of the photovoltaic cell, the heat energy is transmitted to the heat storage water tank (13) through a communication pipeline, and the sewage degraded by photocatalysis in the heat storage water tank (13) is heated; when the sewage in the heat storage water tank (13) reaches a predetermined temperature, the sewage enters the bioreactor (15) and is completely degraded by thermophilic microorganisms. The PV / T module can be used for generating electricity and heat; the electric energy generated by the photovoltaic cell is connected to the storage battery (9) through a power transmission line, is used for the water pump (2) and electric appliances in the system, the storage battery (9) is connected with the inverter (10), the inverter (10) is connected with the power grid (11) and is connected to the sewage treatment plant part (21), the generated heat energy is used for heating sewage, the water body temperature can be ensured to be capable of being subjected to the action of the bioreactor (15), and the low-temperature sewage treated through the system has heat, the heat is exchanged through the heat exchanger (17) and is used for the heat pump system (18) in the sewage treatment plant part (21), sewage plant domestic water (19) and sludge digestion tank (20). The photovoltaic cell (7) of the PV / T module adopts an encapsulation method, is fixedly connected with the upper photocatalytic reactor (3) glass and the lower substrate (8) through the EVA material layer (6); the photovoltaic cell is a crystalline silicon cell with a thickness of 0.4mm-0.9mm, the power generation efficiency reaches 20%-30%, the photovoltaic module can normally generate electricity, the back of the photovoltaic cell is provided with a water pipe and a heat collection pipeline; the photocatalytic reactor is made of heat-resistant ultraviolet high-transmittance borosilicate glass, and a TiO2 film is loaded on the photocatalytic reactor; the TiO2 film is translucent, the ultraviolet light absorption rate is 90%-92%, visible light can pass through the TiO2 film, reacts with ultraviolet light in the sunlight, catalytically degrades pollutants in the water body, and infrared light can also be absorbed by the water body.

2. The system of claim 1, wherein: The sewage treatment system is coupled with the sewage treatment plant part (21), when the solar radiation is sufficient, the electric energy generated by the PV / T module is supplied to the sewage treatment plant part (21) through the battery (9) connected to the inverter (10) connected to the power grid (11), and the water treated by the sewage treatment system is used to supply heat to the sewage treatment plant part (21) through the heat exchanger (17); when the solar radiation is insufficient, the electric energy generated by the PV / T module is stored in the battery (9), the waste heat and the excess electricity of the sewage treatment plant are connected to the system, the sludge digestion tank (20) generates power through methane to supply power to the system, and the heat pump system (18) in the sewage treatment plant part (21) supplies heat to the heat storage water tank (13) to ensure the predetermined temperature of the water body and ensure the normal operation of the system.

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