Carbon sink type rural domestic sewage resource utilization device and application

Abstract

This invention discloses a carbon sink-type rural domestic wastewater resource utilization device and its application. It includes hardware and software. The hardware system comprises an input module, a biological carbon sequestration module, a physical purification module, a plant cultivation module, a PLC sensor, and a photoelectric energy module. The software system includes a data information management center, an intelligent control decision-making module, and an online remote human-machine interactive monitoring interface. The input module is connected to the inlet of the biological carbon sequestration module, the biological carbon sequestration module is connected to the inlet of the physical purification module, and the physical purification module is connected to the inlet of the plant cultivation module. All four modules are fixed within a movable, light-transmitting container, with the photoelectric energy module located on the top of the container. The output data from each module of the hardware system is connected to the software system, enabling intelligent and smart operation of the entire device.

Description

Technical Field

[0001] This invention belongs to the field of rural domestic sewage resource utilization technology, specifically relating to a carbon sink-type rural domestic sewage purification and resource utilization device and its application. Background Technology

[0002] Rural domestic sewage in my country originates from greywater and blackwater, with relatively simple pollutant types but high concentrations of organic matter and nitrogen and phosphorus. Even after pretreatment and biological treatment, the effluent still contains a certain concentration of nitrogen and phosphorus. Reusing it for agricultural production is the best way to utilize rural sewage as a resource. Currently, the resource utilization of rural domestic sewage effluent mainly takes the form of traditional constructed wetlands, stabilization ponds, and biological filters as ecological treatment units. These forms are usually costly, require large areas, are easily limited by geographical location and seasons, and have certain limitations on the amount of effluent they can handle. Meanwhile, long-term urbanization has led to increasingly scarce land resources, making the development of integrated rural sewage purification technologies and devices with smaller footprints particularly important.

[0003] With the advancement of research on the synergistic effect of pollution reduction and carbon reduction, the rural sector also holds enormous potential and demand for emission reduction. This invention mainly provides a technical method for achieving synergistic pollution reduction and carbon reduction while simultaneously utilizing rural domestic sewage effluent for resource recovery. This method transforms nitrogen and phosphorus in the effluent into valuable resources, while also saving energy and electricity, and synergistically increasing carbon sequestration capacity.

[0004] Microalgae are characterized by rapid growth, high CO2 fixation efficiency, and high photosynthetic efficiency. During their growth, they can absorb and degrade pollutants such as nitrogen and phosphorus in wastewater, thus purifying the water. Turning wastewater into a nutrient solution for cultivating microalgae such as spirulina not only achieves carbon sequestration and emission reduction but also yields high-value-added microalgal biomass. Furthermore, microalgae can reoxygenate wastewater through photosynthesis. Hydroponics is a novel soilless cultivation method for plants, using wastewater as a nutrient solution. Plant roots are directly immersed in the wastewater, receiving water, nitrogen, phosphorus, and other nutrients, as well as oxygen and other growth factors, enabling normal plant growth. Summary of the Invention

[0005] The purpose of this invention is to address the problems of high cost, large footprint, and susceptibility to water quality fluctuations in traditional constructed wetland ecological treatment units by proposing a carbon sink-type rural domestic sewage resource utilization device. This device ecologically treats rural domestic sewage effluent, and through intelligent operation and resource utilization of nitrogen and phosphorus in the sewage, it can effectively reduce costs, save land, facilitate operation and maintenance, better adapt to the large fluctuations in rural sewage quality, and achieve long-term stable operation, thus achieving low-carbon water purification and carbon sequestration capacity.

[0006] To achieve the above objectives, the present invention discloses the following technical solution:

[0007] A carbon sink-type rural domestic sewage resource utilization device is characterized by comprising two systems: hardware and software. The hardware system includes an input unit, a biological carbon fixation unit, a physical purification unit, a plant cultivation unit, and a photovoltaic energy unit. The software system includes a data information management center, an intelligent control and decision-making unit, and an online remote human-machine interaction monitoring interface. The input unit is connected to the inlet of the biological carbon fixation unit, the biological carbon fixation unit is connected to the inlet of the physical purification unit, and the physical purification unit is connected to the inlet of the plant cultivation unit. All four units are fixed in a movable, light-transmitting container (1). A photovoltaic energy unit is provided on the top of the container. The output data of each unit of the hardware system is connected to the data information management center through a PLC. The data information management center is interconnected with the intelligent control and decision-making unit and the online remote human-machine interaction monitoring interface, respectively. The intelligent control and decision-making unit is connected to the online remote human-machine interaction monitoring interface to realize the overall intelligent and smart operation settings of the equipment. The hardware system includes:

[0008] (1) Input unit

[0009] It mainly includes: regulating tank 7, continuously variable speed stirrer 8, first automatic metering valve 9, online thermometer, online carbon dioxide concentration monitoring probe, online light intensity monitoring probe, N / P online monitoring probe, and pH online monitoring probe;

[0010] (2) Biological carbon fixation unit

[0011] The unit consists of two layers in space. The lower layer is a water tank, divided into three compartments in a folding plate-like shape. It mainly includes: an algae acclimatization liquid tank 10, a second automatic metering valve 11, a spray pipe 12, a conveyor shaft 13, a carbon-fixing algae biofilm 14, an automatic harvester 15, a baffle pool 16, a microalgae centrifuge 17, and a third automatic metering valve 18. The support frame 29 holds the conveyor shaft and the conveyor motor 28. The carbon-fixing algae biofilm 14 is conveyed in a serpentine manner by the conveyor shaft 13.

[0012] (3) Physical purification unit

[0013] It mainly includes a fourth automatic metering valve 19, a plant cultivation nutrient solution tank 20, a microfiltration membrane assembly 21, and an LED ultraviolet lamp assembly 22;

[0014] (4) Plant cultivation unit

[0015] It mainly includes: metering circulation pump 23, liquid delivery main pipe rack 24, hydroponic support 25, and water absorption substrate tank 26;

[0016] (5) Photovoltaic energy unit

[0017] It mainly includes: 2. Photovoltaic power generation panels, 3. Charge and discharge controller, inverter, AC distribution cabinet, 3. Energy storage device, and 4. Backup power supply; among which

[0018] Photovoltaic power generation panel 2, energy storage device 3, and backup power supply 4 are respectively placed on the top of the transparent container body 1. Intelligent self-control window 5 is placed on the side of the transparent container body. The photovoltaic power generation panel is connected to the energy storage device. The regulating box 7, the baffle pool 16, and the plant cultivation nutrient solution pool 20 are connected horizontally in sequence inside the transparent container body. The online thermometer, the online carbon dioxide concentration monitoring probe, and the online light intensity monitoring probe are placed inside the transparent container body. The N / P online monitoring probe and the pH online monitoring probe are placed inside the regulating box.

[0019] The regulating tank is equipped with a continuously variable speed stirrer 8. A first self-controlled metering valve 9 is connected between the outlet of the regulating tank and the inlet of the baffle tank 16. A fourth self-controlled metering valve is connected between the outlet of the baffle tank 16 and the inlet of the plant cultivation nutrient solution tank 20. A support frame 29 is mounted above the baffle tank. The conveyor motor 28 and the conveyor shaft 13 are both fixed on the support frame. The conveyor motor 28 drives the conveyor shaft carrying the carbon-fixing bacteria and algae biofilm 14 to rotate. The area below the conveyor shaft and the area below the carbon-fixing bacteria and algae biofilm 14 are both submerged below the liquid surface of the baffle tank. The support frame 29 is fixed on both sides. An automatic harvester 15 with a 10%-15% slope has its lower end close to the inlet of the microalgae centrifuge 17, ensuring that the harvested microalgae enter the microalgae centrifuge 17. The lower part of the microalgae centrifuge is a centrifugal liquid layer. When the liquid in the centrifugal liquid layer reaches a certain level, it is opened and closed by gravity through the third self-controlled metering valve 18 to flow to the inlet of the regulating tank 7. The algae acclimatization liquid tank 10 and the spray pipe 12 are set at the top of the light-transmitting container. The spray pipe 12 is connected to the algae acclimatization liquid tank. The second self-controlled metering valve 11 controls the opening and closing of the spray pipe to spray the algae solution onto the carbon-fixing algae biofilm.

[0020] The plant cultivation nutrient solution tank 20 is equipped with a microfiltration membrane assembly 21 at the inlet and a filter baffle 16 at the outlet. An LED ultraviolet lamp assembly 22 is placed at the bottom of the plant cultivation nutrient solution tank 20 for disinfection. A metering circulation pump 23 is installed at the outlet of the plant cultivation nutrient solution tank 20. The metering circulation pump pumps the liquid to the liquid delivery main frame 24. The liquid delivery main frame 24 includes a longitudinal pipe and a transverse pipe. The liquid delivery main frame 24 delivers the liquid in the plant cultivation nutrient solution tank 20 to each hydroponic support 25. A disc-shaped water-absorbing substrate tank 26 is connected to the hydroponic support. The water-absorbing substrate tank is used for hydroponic plant cultivation. The outlet at the lower end of the hydroponic support is connected to the plant cultivation nutrient solution tank 20. The remaining liquid in the hydroponic support after being absorbed by the water-absorbing substrate tank 26 flows back to the plant cultivation nutrient solution tank 20 by gravity, forming a repeated circulation system.

[0021] The software system includes:

[0022] The system includes an online remote human-machine interaction monitoring interface, a data information management center, and an intelligent control and decision-making unit 6; the online remote human-machine interaction monitoring interface is connected in sequence to the input unit, the biological carbon sequestration unit, the physical purification unit, and the plant cultivation unit.

[0023] The data information management center is connected to the online remote human-machine interaction monitoring interface and the intelligent control and decision-making unit, respectively, and is used for the management of the entire system database, including data information collection, classification, historical data storage, input, and output;

[0024] The photovoltaic energy unit is connected to the online remote human-machine interactive monitoring interface on one hand, and to the input unit, biological carbon fixation unit, physical purification unit, and plant cultivation unit on the other hand. The human-machine interactive interface monitors the photovoltaic power generation, stored power, and power consumption of the photovoltaic energy unit in real time. The data is analyzed and decided by the intelligent control and decision-making system in the information management center to determine the activation and deactivation of the backup power supply.

[0025] This invention further discloses a method for treating wastewater using a carbon sink-type rural domestic wastewater resource recovery device, characterized by the following steps:

[0026] I. Input Water Quality Control

[0027] After entering the equalization tank 7, the wastewater is stirred together with the internal circulating water, which includes the concentrated water from the filter membrane and the water from the microalgae centrifuge. The concentration of N / P nutrients and the pH value of the wastewater in the equalization tank are obtained in real time through an online monitoring probe and controlled at the following conditions: ammonia nitrogen 30-50 mg / L, total phosphorus 5-10 mg / L, and pH 7.6-8.2. The microalgae growth environment is controlled at an ambient temperature of 26-33℃, a carbon dioxide volume fraction of 0.03%-0.04%, and a light intensity of 3500 Lux-4000 Lux.

[0028] II. Wastewater Treatment in Biological Carbon Sequestration Unit

[0029] Wastewater in the equalization tank enters the biological carbon sequestration system at a stable flow rate, where wastewater purification and biological carbon sequestration are carried out synergistically. This process is mainly achieved through the following three steps:

[0030] (1) Preparation of carbon fixation materials

[0031] The prepared adsorbent material is mounted on a rotating reaction device. Based on the water quality data collected by the data management center, intelligent water quality simulation is performed. A certain proportion of bacterial-algae mixed preparation is cultured on a large scale and then acclimated in the simulated wastewater. The acclimated carbon-fixing bacterial agent is sprayed onto the mounted adsorbent material by the spray pipe 12 connected to the acclimation algae liquid tank 10. After the adsorbent material adsorbs the bacterial-algae symbiotic organisms and forms a bacterial-algae biofilm layer, it can be used as a carbon-fixing material suitable for the current water quality, namely, carbon-fixing bacterial-algae biofilm 14. The carbon-fixing bacterial agent is composed of: 5-15 parts of nitrifying bacteria, 4-8 parts of Bacillus, 1-2 parts of photosynthetic bacteria, 5-15 parts of Chlorella, and 2-5 parts of Scenedesmus. The weight ratio of the bacterial raw material to the microalgae raw material is 1:0.28-2.

[0032] The bacterial strains mentioned refer to nitrifying bacteria, Bacillus, and photosynthetic bacteria; the microalgae strains refer to Chlorella and Scenedesmus.

[0033] The nitrifying bacteria are one or more of the following: Nitrifying Bacillus, Nitrifying Cocci, and Nitrifying Spirochetes.

[0034] The Bacillus species mentioned is CGMCC 1.9083 Bacillus subtilis;

[0035] The photosynthetic bacteria is Rhodopseudomonas, coded as ACCC 10650;

[0036] The Chlorella mentioned is Chlorella proteoglycans, coded as FACHB-1227 or GY-D26;

[0037] The described Scenedesmus is *Scenedesmus obliquus*, coded as FACHB-416 or FACHB-417.

[0038] The method for scaling up the cultivation of the bacterial-algae mixture:

[0039] S1. Mixing: Under aseptic conditions, the bacterial raw material and the microalgae raw material are mixed and centrifuged at 12000-15000 r / min to remove the supernatant, thus obtaining the bacterial-algae mixed preparation.

[0040] S2. Large-scale culture: Under the conditions of temperature 26-33℃, pH 7.5-8.5, and light-dark ratio of 3:1, the bacterial-algae mixture was mixed with BG11 standard culture medium and cultured for 3-5 days for large-scale culture.

[0041] The method for preparing the carbon-fixing bacterial agent is as follows: the bacterial-algae mixture prepared by the scaled-up culture in steps S1 and S2 is added to unsterilized simulated wastewater at a ratio of 1:20-25 for acclimatization treatment.

[0042] The method for preparing the adsorbent material is as follows: soak the adsorbent material in simulated sewage for 15-20 hours, then rinse it with ultrapure water 3-5 times, then soak it again for 6-8 hours, rinse it with ultrapure water, and then dry it in a natural environment to obtain the prepared adsorbent material.

[0043] (2) Synergistic effect of biological carbon sequestration and wastewater purification

[0044] The adsorbent material is mounted in a serpentine configuration on the conveyor shaft 13 of the biological carbon fixation unit. The lower conveyor shaft 13 and the carbon-fixing bacteria and algae biofilm 14 are both submerged below the liquid surface of the baffle tank 16. Driven by the conveyor shaft, the lower carbon-fixing bacteria and algae biofilm rotates out of the water surface, which can retain sewage to form a nutrient layer liquid.

[0045] The wastewater in the regulating tank 7 flows into the baffle tank 16 at a flow rate of 0.5-0.6 m / s. The "water-moving membrane movement" state allows the carbon-fixing bacteria and algae biofilm 14 to absorb nitrogen and phosphorus nutrients in the wastewater multiple times, fix carbon dioxide to form bacteria and algae biomass, and achieve synergistic biological carbon fixation and wastewater purification.

[0046] When the biofilm layer on the carbon-fixing bacteria and algae biofilm 14 grows to a thickness of 0.1-0.3 mm, it is scraped off by an automatic harvester 15 with a 15% slope. The bacteria and algae biomass is collected by the harvester's collection tank into a microalgae centrifuge 17. Carbon-fixing bacteria are added to the algae acclimatization liquid tank 10. The spraying time is set to within 8 hours after harvesting. The second automatic metering valve 11 is opened and closed to automatically spray the harvested carbon-fixing bacteria and algae biofilm through the spray pipe 12, continuing the continuous carbon fixation and wastewater synergistic purification reaction.

[0047] (3) Resource utilization of by-products

[0048] The harvested bacteria and algae were centrifuged and dehydrated using a microalgae centrifuge 17. The moisture content of the harvested bacteria and algae after dehydration was 45%. The by-products were utilized as follows:

[0049] 1) Pre-conditioning: Input 15-23 parts of sludge and 8-20 parts of straw powder into the mixing system to obtain S1, with the moisture content controlled at 60%-70%; then take 6-12 parts of fungal and algal harvested material and input it into the mixing system to mix with S1 obtained in the above step again for pre-conditioning to obtain mixture S2, with the moisture content controlled at 65%-75%;

[0050] The harvested bacteria and algae are harvested and dehydrated biomass after centrifugation, with a moisture content of 45%-50%.

[0051] The straw powder is one or more of the commercially available wheat straw, rice straw, peanut vines, and bean straw, dried and with a particle size of 80-100 mesh;

[0052] The sludge is generated by the pretreatment stage connected to the device of the present invention, and the sludge has a moisture content of 75-85%.

[0053] 2) Aerobic fermentation: The pre-treated mixture S2 from step 1) is fed into the silo through the feed system. It is stirred by a propeller agitator, and air is introduced by a blower for aerobic fermentation. The blower and agitator are controlled by the fermentation system's time controller, and the stirring and aeration frequency is controlled to be 5-8 days. The moisture content of the mixture S2 in the fermentation system is controlled at 65-75%. Because the fungal and algal harvested materials are rich in nitrogen and phosphorus, the C / N ratio of the mixture S2 is suitable. No nitrogen or phosphorus elements need to be added during the fermentation process. After 20-28 days of aerobic fermentation, when the pH value is stable between 7.5 and 8.3, the fermented cooked material S3 is obtained.

[0054] 3) Extrusion Molding: The cooked material S3 obtained in step 2) is discharged from the outlet of the fermentation system and introduced into the feeding hopper of the molding system. It is then compressed in the compression chamber to obtain S4. The compressed shape includes, but is not limited to, cylinders and cuboids, with a volume of 1570-9216 cm³. 3 The moisture content is 30%-45%. The ratio of radius to thickness of the cylinder is 2:1, with a radius of 10-16cm and a thickness of 5-8cm. The length-width-height ratio of the cuboid is 6:3:1, with a length of 30-48cm, a width of 15-24cm, and a thickness of 5-8cm.

[0055] 4) Drying: The S4 blocks formed in step 3) are subjected to rapid drying for 8-20 hours. The finished product has a moisture content of 10-15%, a water absorption of 40%-50%, and a density of 0.8-1.4 g / cm³. 3 .

[0056] III. Physical Purification Unit

[0057] Wastewater enters the front end of the plant cultivation nutrient solution tank 20 through the outlet of the baffle tank 16 via the fourth self-controlled metering valve 19. It is first filtered by the microfiltration membrane module 21 to remove a small amount of naturally fallen bacteria and algae symbiotic organisms and other impurities. The bacteria and algae mud on the microfiltration membrane module is recycled by rinsing. After filtration, the wastewater is disinfected by the LED ultraviolet lamp group 22 at the bottom of the rear end of the plant cultivation nutrient solution tank, which effectively prevents the bacteria in the wastewater from affecting the growth of hydroponic plants.

[0058] IV. Cultivation Unit

[0059] The physically purified wastewater in the plant cultivation nutrient solution tank 20 is pumped into the longitudinal pipe of the liquid main frame 24 by the metering circulation pump 23. The longitudinal pipe transports the water to the transverse pipe, and then to each hydroponic support 25. Aloe vera is planted in the disc-shaped water-absorbing substrate tank 26 connected to the hydroponic support. The liquid level in the disc-shaped water-absorbing substrate tank is controlled at 3 / 2. After the plants absorb nutrients, the wastewater flows back to the plant cultivation nutrient solution tank 20 by gravity, forming a repeated circulation system to achieve zero wastewater discharge.

[0060] The wastewater treatment method disclosed in this invention can adapt to the large fluctuation range of rural wastewater quality, achieving long-term stable operation.

[0061] The advantages of the carbon sink-type rural domestic sewage resource utilization device and its application disclosed in this invention compared with existing technologies are as follows:

[0062] (1) This invention is an integrated device that can quickly replace other ecological treatment units with poor operating performance, saving land, investment and construction time.

[0063] (2) The device can be operated intelligently, is easy to maintain, and can adapt to the large fluctuation range of rural sewage water quality, and can operate stably for a long time.

[0064] (3) By utilizing nitrogen and phosphorus resources in domestic sewage, and combining sunlight and CO2 to rapidly grow algae, no organic carbon source is required. Byproducts such as algae / plants in the device can be harvested and used to make fertilizer, reducing energy consumption and saving operating costs per ton of water. Attached Figure Description

[0065] Figure 1 The overall technical solution diagram provided by the present invention;

[0066] Figure 2 A top view schematic diagram of the technical device provided by the present invention;

[0067] Figure 3 A front view schematic diagram of the technical device provided by the present invention;

[0068] Figure 4 A schematic diagram of the carbon fixation unit of the technical device provided by the present invention (left view);

[0069] Figure 5 A top view schematic diagram of the carbon fixation unit of the technical device provided by the present invention;

[0070] Figure 6 This invention provides a process flow diagram for the renovation of a rural domestic sewage treatment system.

[0071] Figure 7 This invention provides a resource-based treatment technology solution for rural domestic sewage.

[0072] Figure 8 A process flow diagram for the resource utilization of by-products provided by this invention;

[0073] Figure 9 This is a schematic diagram of the structure of the adsorption material prepared in this invention;

[0074] Figure 10 Predictive model architecture diagram;

[0075] Numbers in the attached drawings:

[0076] 1-Transparent container body, 2-Photovoltaic power generation panel, 3-Energy storage device, 4-Backup power supply, 5-Intelligent automatic control window,

[0077] 6-Intelligent control and decision-making unit, 7-Regulating box, 8-Continuously variable speed mixer, 9-First automatic metering valve,

[0078] 10-Algae acclimatization solution tank, 11-Second automatic metering valve, 12-Spray pipe, 13-Conveyor shaft,

[0079] 14-Carbon-fixing bacterial and algal biofilm; 15-Automatic harvester; 16-Baffled pool; 17-Microalgae centrifuge.

[0080] 18-Third automatic metering valve, 19-Fourth automatic metering valve, 20-Plant cultivation nutrient solution tank.

[0081] 21-Microfiltration membrane module, 22-LED UV lamp assembly, 23-Metering circulation pump, 24-Main liquid delivery pipe rack,

[0082] 25-Hydroculture rack, 26-Water absorption substrate tank, 27-Recirculation pump, 28-Transmission motor, 29-Support frame;

[0083] 2-1 Carbon fiber substrate layer; 2-2 Woven fabric substrate layer; 2-3 Absorbent nonwoven fabric layer; 2-4 Mesh glass fiber layer;

[0084] 2-5 adhesive layers. Detailed Implementation

[0085] The present invention will now be described through specific embodiments. Unless otherwise specified, all technical means used in this invention are methods well known to those skilled in the art. Furthermore, the embodiments should be understood as illustrative, not limiting, of the scope of the invention; the essence and scope of the invention are defined only by the claims. For those skilled in the art, various changes or modifications to the material composition and dosage in these embodiments without departing from the essence and scope of the invention are also within the scope of protection of this invention. All raw materials used are commercially available (unless otherwise stated).

[0086] Example 1

[0087] A carbon sink-type rural domestic sewage resource utilization device is characterized by comprising two systems: hardware and software. The hardware system includes an input unit, a biological carbon fixation unit, a physical purification unit, a plant cultivation unit, and a photovoltaic energy unit. The software system includes a data information management center, an intelligent control and decision-making unit, and an online remote human-machine interaction monitoring interface. The input unit is connected to the inlet of the biological carbon fixation unit, the biological carbon fixation unit is connected to the inlet of the physical purification unit, and the physical purification unit is connected to the inlet of the plant cultivation unit. All four units are fixed in a movable, light-transmitting container (1). A photovoltaic energy unit is provided on the top of the container. The output data of each unit of the hardware system is connected to the data information management center through a PLC. The data information management center is interconnected with the intelligent control and decision-making unit and the online remote human-machine interaction monitoring interface, respectively. The intelligent control and decision-making unit is connected to the online remote human-machine interaction monitoring interface to realize the overall intelligent and smart operation settings of the equipment. The hardware system includes:

[0088] (1) Input unit

[0089] It mainly includes: regulating tank 7, continuously variable speed stirrer 8, first automatic metering valve 9, online thermometer, online carbon dioxide concentration monitoring probe, online light intensity monitoring probe, N / P online monitoring probe, and pH online monitoring probe;

[0090] (2) Biological carbon fixation unit

[0091] The unit consists of two layers in space. The lower layer is a water tank, divided into three compartments in a folding plate-like shape. It mainly includes: an algae acclimatization liquid tank 10, a second automatic metering valve 11, a spray pipe 12, a conveyor shaft 13, a carbon-fixing algae biofilm 14, an automatic harvester 15, a baffle pool 16, a microalgae centrifuge 17, and a third automatic metering valve 18. The support frame 29 holds the conveyor shaft and the conveyor motor 28. The carbon-fixing algae biofilm 14 is conveyed in a serpentine manner by the conveyor shaft.

[0092] (3) Physical purification unit

[0093] It mainly includes a fourth automatic metering valve 19, a plant cultivation nutrient solution tank 20, a microfiltration membrane assembly 21, and an LED ultraviolet lamp assembly 22;

[0094] (4) Plant cultivation unit

[0095] It mainly includes: metering circulation pump 23, liquid delivery main pipe rack 24, hydroponic support 25, and water absorption substrate tank 26;

[0096] (5) Photovoltaic energy unit

[0097] The main components include: photovoltaic panels 2, charge and discharge controller, inverter, AC distribution cabinet, energy storage device 3, and backup power supply 4; the photovoltaic panels 2, energy storage device 3, and backup power supply 4 are respectively placed on the top of the transparent container body, the intelligent self-control window 5 is placed on the side of the transparent container body, and the photovoltaic panels are connected to the energy storage device; the regulating box 7, the baffle pool 16, and the plant cultivation nutrient solution pool 20 are connected horizontally in sequence inside the transparent container body; the online thermometer, the online carbon dioxide concentration monitoring probe, and the online light intensity monitoring probe are placed inside the transparent container body, and the N / P online monitoring probe and the pH online monitoring probe are placed inside the regulating box;

[0098] The regulating tank is equipped with a continuously variable speed stirrer 8. A first self-controlled metering valve 9 is connected between the outlet of the regulating tank and the inlet of the baffle tank 16. A fourth self-controlled metering valve is connected between the outlet of the baffle tank and the inlet of the plant cultivation nutrient solution tank 20. A support frame 29 is mounted above the baffle tank. The conveyor motor 28 and the conveyor shaft 13 are both fixed on the support frame. The conveyor motor 28 drives the conveyor shaft carrying the carbon-fixing bacteria and algae biofilm 14. The area below the conveyor shaft and the area below the carbon-fixing bacteria and algae biofilm are both submerged below the liquid surface of the baffle tank. Automatic harvesters with a 15% slope are fixed on both sides, with the lower end close to the inlet of the microalgae centrifuge 17, ensuring that the harvested microalgae enter the microalgae centrifuge. The lower part of the microalgae centrifuge is a centrifugal liquid layer. When the liquid in the centrifugal liquid layer reaches a certain level, it is opened and closed by gravity through the third self-controlled metering valve 18 to flow to the inlet of the regulating tank. The algae acclimatization liquid tank 10 and the spray pipe 12 are set at the top of the light-transmitting container. The algae acclimatization liquid tank is connected to the spray pipe, and the second self-controlled metering valve 11 controls the opening and closing of the spray pipe to spray the algae solution onto the carbon-fixing algae biofilm.

[0099] A microfiltration membrane assembly 21 is installed at the front end of the inlet of the plant cultivation nutrient solution tank 20, and a filter baffle 16 is installed at the outlet. A return pump 27 is connected to the inlet of the regulating tank 7 to pump the concentrated water filtered by the microfiltration membrane assembly 21 to the inlet at the front end of the device. An LED ultraviolet lamp assembly 22 is placed at the bottom of the plant cultivation nutrient solution tank 20 for disinfection. A metering circulation pump 23 is installed at the outlet of the plant cultivation nutrient solution tank. The metering circulation pump pumps the liquid to the main liquid delivery frame 24, which includes a longitudinal pipe and a transverse pipe. The main liquid delivery frame transports the liquid in the plant cultivation nutrient solution tank to each hydroponic support 25. A disc-shaped water-absorbing substrate tank 26 is connected to the hydroponic support. The water-absorbing substrate tank is used for hydroponic plant cultivation. The outlet at the lower end of the hydroponic support is connected to the plant cultivation nutrient solution tank. The remaining liquid in the hydroponic support after being absorbed by the water-absorbing substrate tank flows back to the plant cultivation nutrient solution tank by gravity, forming a repeated circulation system.

[0100] The software system includes:

[0101] Online remote human-machine interaction monitoring interface, data information management center, and intelligent control and decision-making unit; among which:

[0102] The online remote human-computer interaction monitoring interface is connected sequentially to the input unit, biological carbon sequestration unit, physical purification unit, and plant cultivation unit;

[0103] The data information management center is connected to the online remote human-machine interaction monitoring interface and the intelligent control and decision-making unit, respectively, and is used for the management of the entire system database, including data information collection, classification, historical data storage, input, and output;

[0104] The photovoltaic energy unit is connected to the online remote human-machine interactive monitoring interface on one hand, and to the input unit, biological carbon fixation unit, physical purification unit, and plant cultivation unit on the other hand. The human-machine interactive interface monitors the photovoltaic power generation, stored power, and power consumption of the photovoltaic energy unit in real time. The data is analyzed and decided by the intelligent control and decision-making system in the information management center to determine the activation and deactivation of the backup power supply.

[0105] Example 2

[0106] A method for treating rural domestic sewage using a carbon sink-type rural domestic sewage resource recovery device:

[0107] I. Input Water Quality Control

[0108] After entering the equalization tank 7, the wastewater is stirred together with the internal circulating water, which includes the concentrated water from the filter membrane and the water from the microalgae centrifuge. The concentration of N / P nutrients and the pH value of the wastewater in the equalization tank are obtained in real time through an online monitoring probe and controlled under the following conditions: ammonia nitrogen 30 mg / L, total phosphorus 5 mg / L, and pH 7.6-8.2; the microalgae growth environment is controlled under the following conditions: ambient temperature 26℃, carbon dioxide volume fraction 0.03%, and light intensity 3500 Lux.

[0109] II. Wastewater Treatment in Biological Carbon Sequestration Unit

[0110] Wastewater in the equalization tank enters the biological carbon sequestration system at a stable flow rate, where wastewater purification and biological carbon sequestration are carried out synergistically. This process is mainly achieved through the following three steps:

[0111] (1) Preparation of carbon fixation materials

[0112] The prepared adsorbent material is mounted on a rotating reaction device. Based on the water quality data collected by the data management center, intelligent water quality simulation is carried out. After a certain ratio of bacterial and algal mixed preparation is cultured on a large scale, it is acclimatized and cultured in the simulated wastewater. The acclimatized carbon-fixing bacteria agent is sprayed onto the mounted adsorbent material by the spray pipe 12 connected to the algal acclimatization tank 10. After the adsorbent material adsorbs the bacterial and algal symbiotic organisms to form a bacterial and algal biofilm layer, it can be used as a carbon-fixing material suitable for the current water quality, namely carbon-fixing bacterial and algal biofilm 14.

[0113] The carbon-fixing bacterial agent consists of: 5 parts of Nitrifying Bacillus, 4 parts of CGMCC 1.9083 Bacillus subtilis, 1 part of ACCC10650 Rhodopseudomonas palustris, 5 parts of FACHB-1227 Chlorella vulgaris, and 2 parts of FACHB-416 Scenedesmus obliquus, with a weight ratio of bacterial raw material to microalgae raw material of 1:0.7.

[0114] The method for scaling up the cultivation of the bacterial-algae mixture:

[0115] S1. Mixing: Under aseptic conditions, the bacterial raw material and the microalgae raw material are mixed and centrifuged at 12000 r / min to remove the supernatant, thus obtaining the bacterial-algae mixed preparation.

[0116] S2. Large-scale culture: Under the conditions of 28℃, pH 7.5, and alternating light and dark ratio of 3:1, the bacterial-algae mixture was mixed with BG11 standard culture medium and cultured for 3 days.

[0117] The method for preparing the carbon-fixing bacterial agent is as follows: the bacterial-algae mixture prepared by the scaled-up culture in steps S1 and S2 is added to unsterilized simulated wastewater at a ratio of 1:20 for acclimatization treatment.

[0118] The method for preparing the adsorbent material is as follows: the adsorbent material is soaked in simulated sewage for 15 hours, then rinsed three times with ultrapure water, then soaked again for 6 hours, rinsed with ultrapure water, and then dried in a natural environment to obtain the prepared adsorbent material (see Example 3 for the detailed preparation method of the adsorbent material).

[0119] (2) Synergistic effect of biological carbon sequestration and wastewater purification

[0120] The adsorbent material is mounted in a serpentine configuration on the conveyor shaft 13 of the biological carbon fixation unit; the lower conveyor shaft and the carbon-fixing bacteria and algae biofilm 14 are both submerged below the liquid surface of the baffle tank 16. Driven by the conveyor shaft, the lower carbon-fixing bacteria and algae biofilm rotates out of the water surface, which can retain sewage to form a nutrient layer liquid.

[0121] The sewage in the regulating tank flows into the baffle tank 16 at a flow rate of 0.5 m / s. The "water-moving membrane movement" state allows the carbon-fixing bacteria and algae biofilm 14 to absorb nitrogen and phosphorus nutrients in the sewage multiple times, fix carbon dioxide to form bacteria and algae biomass, and achieve synergistic biological carbon fixation and sewage purification.

[0122] When the biofilm layer on the carbon-fixing bacteria and algae biofilm 14 grows to a thickness of 0.1 mm, it is scraped off by an automatic harvester 15 with a 15% slope. The bacteria and algae biomass is collected by the harvester's collection tank into a microalgae centrifuge 17. Carbon-fixing bacteria are added to the algae acclimatization liquid tank 10. The spraying time is set to within 8 hours after harvesting. The second automatic metering valve 11 is opened and closed to automatically spray the harvested carbon-fixing bacteria and algae biofilm through the spray pipe 12, continuing the continuous carbon fixation and wastewater synergistic purification reaction.

[0123] (3) Resource utilization of by-products

[0124] The harvested bacteria and algae were centrifuged and dehydrated using a microalgae centrifuge 17. The moisture content of the harvested bacteria and algae after dehydration was 45%. The by-products were utilized as follows:

[0125] 1) Pre-conditioning: First, 15 parts of sludge and 8 parts of straw powder are fed into the mixing system to obtain S1 with a moisture content of 60%; then, 6 parts of fungal and algal harvested material are fed into the mixing system and mixed with S1 obtained in the above step for pre-conditioning to obtain mixture S2 with a moisture content of 65%.

[0126] The harvested bacteria and algae are harvested and dehydrated biomass after centrifugation, with a moisture content of 45%.

[0127] The straw powder is commercially available wheat straw powder, which is dry and has a particle size of 80 mesh;

[0128] The sludge is generated from the pretreatment stage and has a moisture content of 80%.

[0129] 2) Aerobic fermentation: The pre-treated mixture S2 from step 1) is fed into the silo through the feed system and introduced into the fermentation system. It is stirred by a propeller agitator and air is introduced by a blower for aerobic fermentation. The time controller of the fermentation system controls the blower and agitator, and controls the stirring and aeration frequency to 5 days. The moisture content of the mixture S2 in the fermentation system is controlled at 70%. No nitrogen or phosphorus elements need to be added during the fermentation process. After 25 days of aerobic fermentation, when the pH value is stable between 7.5 and 8.3, the fermented cooked material S3 is obtained.

[0130] 3) Extrusion Molding: The cooked material S3 obtained in step 2) is discharged from the fermentation system outlet and introduced into the feeding hopper of the molding system. It is then pressed into a cuboid in the compression chamber to obtain S4, which is 30cm long, 15cm wide, 5cm thick, and has a volume of 2250cm³. 3 The moisture content is 45%.

[0131] 4) Drying: The S4 blocks formed in step 3) are rapidly dried to obtain the finished product. The drying time is 15 hours. The finished product has a moisture content of 15%, a water absorption rate of 45%, and a density of 1.2 g / cm³. 3 ;

[0132] III. Physical Purification Unit

[0133] Wastewater enters the front end of the plant cultivation nutrient solution tank 20 through the outlet of the baffle tank 16 via the fourth self-controlled metering valve 19. It is first filtered by the microfiltration membrane module 21 to remove a small amount of naturally fallen bacteria and algae symbiotic organisms and other impurities. The bacteria and algae sludge on the microfiltration membrane module is recycled by rinsing. After filtration, the wastewater is disinfected by the LED ultraviolet lamp group 22 at the bottom of the rear end of the plant cultivation nutrient solution tank, which effectively prevents bacteria in the wastewater from affecting the growth of hydroponic plants.

[0134] IV. Cultivation Unit

[0135] The physically purified wastewater in the plant cultivation nutrient solution tank 20 is pumped into the longitudinal pipe of the liquid main frame 24 by the metering circulation pump 23. The longitudinal pipe transports the water to the transverse pipe, and then to each hydroponic support 25. Aloe vera is planted in the disc-shaped water-absorbing substrate tank 26 connected to the hydroponic support. The liquid level in the disc-shaped water-absorbing substrate tank is controlled at 3 / 2. After the plants absorb nutrients, the wastewater flows back to the plant cultivation nutrient solution tank 20 by gravity, forming a repeated circulation system to achieve zero wastewater discharge.

[0136] Example 3

[0137] Preparation method of adsorbent material:

[0138] (1) Take 3 parts of polypropylene-polyethylene composite fiber and 1 part of polyvinyl alcohol formaldehyde fiber and weave them into a woven fabric substrate layer 2-2;

[0139] (2) Take 6 parts of polyester staple fiber, 2 parts of chitosan fiber and 1 part of seaweed fiber, and form 2-3 layers of water-absorbing non-woven fabric after hydroentangling and finishing;

[0140] (3) 1.2% by weight of silica light diffusing agent is doped into alkali-free glass fiber to form a mesh glass fiber layer 2-4 with a mesh size of 100μm and a mesh depth of 15μm, wherein the average particle size of the diffusing agent particles is 5μm.

[0141] (4) Using commercially available polyacrylonitrile-based carbon fiber cloth as the carbon fiber base layer 2-1, and applying polyurethane adhesive according to... Figure 9 The structure shown consists of the woven fabric substrate layer 2-2, the absorbent nonwoven fabric layer 2-3, and the mesh glass fiber layer 2-4 prepared in steps (1)-(3) bonded together in sequence to form the adsorbent material described in this invention.

[0142] Example 4

[0143] A rural domestic sewage treatment plant in northern China uses a buried A2 / O + constructed wetland treatment process with a treatment capacity of 300m³. 3 / d. In actual operation, it was found that the effectiveness of constructed wetlands in wastewater treatment significantly decreases when the water temperature is below 10 degrees Celsius in winter. Below 4 degrees Celsius, nitrification in the constructed wetlands tends to cease, causing the effluent levels of ammonia nitrogen, total nitrogen, and total phosphorus to fail to meet relevant local standards. To reduce investment and construction difficulty, the inlet of this invention can be directly connected from the effluent of the existing sedimentation tank, quickly replacing the original constructed wetland unit. Furthermore, wastewater is recycled within the device and not discharged externally. See the detailed implementation process below. Figure 6 After upgrading and transforming the rural sewage treatment plant using this invention, all effluent is recycled and not discharged externally, achieving a better treatment effect.

[0144] Example 5

[0145] In a rural area where residents live scattered, domestic sewage is often discharged arbitrarily into surrounding water bodies without effective treatment. This results in low utilization rates and easily pollutes surrounding surface water, groundwater, and soil, leading to deterioration of environmental sanitation and threatening rural drinking water safety. This invention utilizes an integrated device combining a septic tank and the sewage from one or several nearby households. The sewage is then used as a nutrient solution for algae and plants within the device, purifying the sewage and recycling various nutrients. The resulting algae and plant byproducts can be processed into fertilizer or sold as organic vegetables. For detailed implementation details, see [link to specific implementation details]. Figure 7 The use of this invention to collect and treat domestic sewage from several neighboring households in the rural area can greatly improve the rural living environment, with low operating costs and the ability to generate certain economic benefits.

[0146] Example 6

[0147] The comparative experiment proceeded as follows:

[0148] (1) The pretreated rural domestic sewage was diverted at a flow rate of 0.5m 3 A flow rate of / h was introduced into the baffle tank, and a mixed bacterial and algal preparation after large-scale cultivation was added to carry out suspended bacterial and algal biological reaction for water purification and carbon fixation. After 7 days of reaction, the mixed liquid was taken from the baffle tank, and after centrifugation, the supernatant was taken to detect its nitrogen and phosphorus content.

[0149] (2) The pretreated rural domestic sewage was diverted at a flow rate of 0.5m 3A flow rate of / h is introduced into the baffled tank. The adsorbent material of the present invention, after being adsorbed by algae and bacteria to form a biofilm, is loaded onto the conveyor shaft. After reacting for 7 days, the mixture is taken from the tank, and after centrifugation, the supernatant is taken to detect its nitrogen and phosphorus content.

[0150] The bacterial-algae mixture and its scale-up culture are as follows: Under aseptic conditions, the bacterial strain and microalgae are mixed, and the supernatant is removed by centrifugation at 12000 r / min to obtain the bacterial-algae mixture. The bacterial-algae mixture mainly contains 5 parts of nitrifying bacteria (Nitrifying Spirulina), 4 parts of Bacillus subtilis (CGMCC 1.9083), 1 part of photosynthetic bacteria (ACCC 10650 Rhodopseudomonas palustris), 5 parts of Chlorella proteoid (GY-D26 Chlorella proteoidis), and 2 parts of Scenedesmus obliquus (FACHB-416 Scenedesmus obliquus), with a bacterial strain to microalgae weight ratio of 1:0.7. Then, using commercially available BG11 standard culture medium, the bacterial-algae mixture is mixed with the culture medium and cultured for 3 days under conditions of 26℃, pH 7.5, and alternating light and dark ratio of 3:1. The aforementioned bacterial-algal symbiotic is defined as follows: when the absorbance (OD685) of the bacterial-algal mixture suspension in a large-scale culture reaches 0.7.

[0151] The method for preparing the carbon-fixing bacterial-algae biofilm is as follows: The adsorbent material is soaked in rural domestic sewage for 15 hours, then rinsed four times with ultrapure water, followed by a second soaking for 6 hours, rinsing with ultrapure water, and then dried in a natural environment. The prepared adsorbent material is then repeatedly immersed in the bacterial-algae symbiotic organism three times. After immersion, BG11 standard culture medium is sprayed onto the surface layer of the mesh glass fiber layer 4 daily. After culturing for 6 days, the carbon-fixing bacterial-algae biofilm is obtained.

[0152] The nitrogen fixation and phosphorus removal rates of each control group are compared in the following table:

[0153]

[0154] in conclusion:

[0155] (1) The carbon fixation and phosphorus removal rate of the present invention is better than that of the control group.

[0156] (2) In addition, the adsorption material of the present invention can be easily obtained by-products and made into carbon sink products such as biomass fertilizers or soil conditioners for resource utilization, which can generate certain economic benefits.

[0157] Example 7

[0158] Practical application examples:

[0159] First, take the rectangular finished product obtained in step (3) of Example 2, soak it in 0.4-0.6L of tap water for 10-15 minutes to allow it to fully absorb water, and then use it as a culture medium for planting ornamental potted plants. The method of use is simple. The potted plants can be precious flowers. The culture medium is rich in organic matter and trace elements, and is more loose, which is conducive to the root growth of flowers and less likely to cause pests. Conclusion: The culture medium has long-lasting fertility, and a small piece of the finished product can maintain the growth needs of 3-4 pots of flowers.

[0160] Example 8

[0161] (1) Data collection

[0162] Real-time monitoring and acquisition of operational data are achieved through PLC-based sensors. The real-time data collected by the online monitoring probe, such as ambient temperature, light intensity, carbon dioxide concentration, and ammonia nitrogen, total phosphorus concentration and pH value in wastewater, are transmitted to the data information management center via network, Bluetooth and other means. The data information management center then classifies the data, stores historical data, and exports data tables and historical data trend lines.

[0163] (2) Data Predictive Analysis

[0164] The operational parameter information collected by the data information management center is input into the data prediction and analysis module. This module employs an improved principal component analysis-long short-term memory network (LSTM) prediction model for analysis. This model first uses principal component analysis to filter the collected multivariate time series data, identifying input parameters with strong correlation to the prediction parameters and reducing the dimensionality of the input data. Secondly, an LTM network is used to establish a prediction model for the reduction effects of ammonia nitrogen and total phosphorus during the water purification process. The relevant variables selected through principal component analysis are used as inputs, and the reduction amounts of ammonia nitrogen and total phosphorus are used as the outputs of the network model.

[0165] Due to such Figure 1 In the process of synergistic wastewater purification, the biological carbon sequestration unit shown has direct or indirect influences on the growth of the bacterial symbiotic organisms, including environmental parameters such as ambient temperature, light intensity, carbon dioxide concentration, influent flow rate, ammonia nitrogen, total phosphorus, dissolved oxygen concentration, and pH value. The growth of the bacterial symbiotic organisms indirectly affects the ammonia nitrogen and total phosphorus concentrations in the effluent. Therefore, the input vector X1, the input vector X selected after principal component analysis, and the output vector Y of the principal component analysis-long short-term memory network prediction model are determined as follows:

[0166] X1 = [Ambient temperature, light intensity, carbon dioxide concentration, influent flow rate, ammonia nitrogen, total phosphorus, dissolved oxygen, pH value]

[0167] X = [Carbon dioxide concentration, influent flow rate, ammonia nitrogen, total phosphorus, pH value]

[0168] Y = [Effluent ammonia nitrogen and total phosphorus]

[0169] The model is attached. Figure 2 As shown.

[0170] Using 20 days of steady-state data as training samples, a sliding window was used to divide the historical dataset, maintaining a consistent 50 training sample groups. This allowed the model to continuously update and adapt as the system changed, discarding old data and adding new data to build a new model that reflects the current situation, ensuring real-time performance. The Long Short-Term Memory (LSTM) network model was optimized using a stochastic gradient descent algorithm. The model was then saved, and predictions were analyzed using the prediction sample set to obtain the prediction results.

[0171] (3) Intelligent control and decision support

[0172] Based on the results predicted in step (2) above, the risk level is determined by comparing it with the initially set nitrogen and phosphorus content thresholds and abnormal data, as shown in Tables 1 and 2 below (taking effluent ammonia nitrogen as an example). The operation instructions corresponding to the risk level are sent to the operators for decision-making, so as to realize early warning and early prevention for the safe and stable operation of the device.

[0173] The collected abnormal data is pushed to the operators. After the operators make a decision, they use an optimized fuzzy PID controller to regulate the abnormal water quality. The operators determine the decision knowledge expert base through human-computer interaction based on the growth of the bacterial-algae symbiotic organisms. The decision knowledge base provides decision support information to the operators, and the decision results are fed back to the decision support system to continuously optimize the decision knowledge base and improve the accuracy of decision-making.

[0174] Table 1. Effluent Ammonia Nitrogen Parameter Level Table

[0175]

[0176] Table 2 Measurement Decision Table

[0177]

[0178] (4) Online remote human-machine interaction: The PLC sensor will save the collected data in the PLC register in real time. The PLC will display the data in real time through the human-machine interaction interface. The data will be displayed to the operator through the online remote human-machine interaction monitoring interface to realize the visualization of the data for on-site observation and decision control.

Claims

1. A carbon sink-type rural domestic sewage resource utilization device, characterized in that... It includes two systems: hardware and software. The hardware system includes an input unit, a biological carbon fixation unit, a physical purification unit, a plant cultivation unit, and a photoelectric energy unit. The software system includes a data information management center, an intelligent control and decision-making unit, and an online remote human-machine interaction monitoring interface. The input unit is connected to the inlet of the biological carbon fixation unit, the biological carbon fixation unit is connected to the inlet of the physical purification unit, and the physical purification unit is connected to the inlet of the plant cultivation unit. The entire hardware system is fixed in a movable, light-transmitting container (1). A photoelectric energy unit is installed on the top of the container. The output data of each unit of the hardware system is connected to the data information management center through a PLC. The data information management center is interconnected with the intelligent control and decision-making unit and the online remote human-machine interaction monitoring interface. The intelligent control and decision-making unit is connected to the online remote human-machine interaction monitoring interface to realize the overall intelligent and smart operation settings of the equipment. The hardware system includes: (1) Input unit The main components include: a regulating tank (7), a continuously variable speed stirrer (8), a first self-controlled metering valve (9), an online thermometer, an online carbon dioxide concentration monitoring probe, an online light intensity monitoring probe, an online N / P monitoring probe, and an online pH monitoring probe; (2) Biological carbon fixation unit The unit consists of two layers in space, with the lower layer being a water tank. The water tank is divided into three compartments in a folded plate form. The biological carbon fixation unit mainly includes: an algae acclimatization tank (10), a second self-controlled metering valve (11), a spray pipe (12), a conveyor shaft (13), a carbon-fixing bacteria and algae biofilm (14), an automatic harvester (15), a baffle pool (16), a microalgae centrifuge (17), and a third self-controlled metering valve (18). The support frame (29) is equipped with a conveyor shaft (13) and a conveyor motor (28). The carbon-fixing bacteria and algae biofilm (14) is conveyed in a serpentine manner by the conveyor shaft (13). (3) Physical purification unit The main components include the fourth automatic metering valve (19), the plant cultivation nutrient solution tank (20), the microfiltration membrane module (21), and the LED ultraviolet lamp group (22). (4) Plant cultivation unit The main components include: metering circulation pump (23), liquid delivery main pipe rack (24), hydroponic support (25), and water absorption substrate tank (26). (5) Photovoltaic energy unit It mainly includes: photovoltaic panels (2), charge and discharge controller, inverter, AC distribution cabinet, energy storage device (3), and backup power supply (4); among which The photovoltaic power generation panel (2), the energy storage device (3), and the backup power supply (4) are respectively placed on the top of the transparent container body (1), and the intelligent self-control window (5) is placed on the side of the transparent container body (1). The photovoltaic power generation panel (2) is connected to the energy storage device (3). The regulating box (7), the baffle pool (16), and the plant cultivation nutrient solution pool (20) are connected in the horizontal direction inside the transparent container body (1). The online thermometer, the online carbon dioxide concentration monitoring probe, and the online light intensity monitoring probe are placed inside the transparent container body (1), and the N / P online monitoring probe and the pH online monitoring probe are placed inside the regulating box (7). The regulating tank (7) is equipped with a continuously variable speed stirrer (8). A first self-controlled metering valve (9) is connected between the outlet of the regulating tank (7) and the inlet of the baffle tank (16). A fourth self-controlled metering valve (19) is connected between the outlet of the baffle tank (16) and the inlet of the plant cultivation nutrient solution tank (20). A support frame (29) is mounted above the baffle tank (16). The conveyor motor (28) and the conveyor shaft (13) are both fixed on the support frame (29). The conveyor motor (28) drives the conveyor shaft (13) loaded with carbon-fixing bacteria and algae biofilm (14) to rotate. The area below the conveyor shaft (13) and the area below the carbon-fixing bacteria and algae biofilm (14) are both submerged below the liquid surface of the baffle tank (16). Automatic harvesters (15) with a 10%-15% slope are fixed on both sides of the frame (29). The lower end of the harvester is close to the inlet of the microalgae centrifuge (17) to ensure that the harvested microalgae enter the microalgae centrifuge (17). The lower part of the microalgae centrifuge (17) is a centrifugal liquid layer. When the liquid in the centrifugal liquid layer reaches a certain level, it is opened and closed by the third self-controlled metering valve (18) to flow by gravity to the inlet of the regulating tank (7). The algae acclimatization liquid tank (10) and the spray pipe (12) are set at the top inside the light-transmitting container (1). The algae acclimatization liquid tank (10) is connected to the spray pipe (12). The second self-controlled metering valve (11) controls the spray pipe (12) to open and close to spray the algae solution onto the carbon-fixing algae biofilm (14). The plant cultivation nutrient solution tank (20) is equipped with a microfiltration membrane assembly (21) at the inlet, a filter baffle (16) at the outlet, and an LED ultraviolet lamp assembly (22) at the bottom of the plant cultivation nutrient solution tank (20) for disinfection. A metering circulation pump (23) is installed at the outlet of the plant cultivation nutrient solution tank (20). The metering circulation pump (23) pumps the liquid to the liquid delivery main frame (24). The liquid delivery main frame (24) includes a longitudinal pipe and a transverse pipe. The liquid in the plant cultivation nutrient solution tank (20) is transported to each hydroponic support (25). A disc-shaped water-absorbing substrate tank (26) is connected to the hydroponic support (25). The water-absorbing substrate tank (26) is used for hydroponic plant cultivation. The water outlet at the lower end of the hydroponic support (25) is connected to the plant cultivation nutrient solution tank (20). The remaining part of the liquid in the hydroponic support (25) after being absorbed by the water-absorbing substrate tank (26) flows to the plant cultivation nutrient solution tank (20) by gravity, forming a repeated circulation system. The software system includes: Online remote human-computer interaction monitoring interface, data information management center, intelligent control and decision-making unit (6); among which: The online remote human-computer interaction monitoring interface is connected sequentially to the input unit, biological carbon sequestration unit, physical purification unit, and plant cultivation unit; The data information management center is connected to the online remote human-machine interaction monitoring interface and the intelligent control and decision-making unit, respectively, and is used for the management of the entire system database, including data information collection, classification, historical data storage, input, and output; The photovoltaic energy unit is connected to the online remote human-machine interactive monitoring interface on one hand, and to the input unit, biological carbon fixation unit, physical purification unit, and plant cultivation unit on the other hand. The human-machine interactive interface monitors the photovoltaic power generation, stored power, and power consumption of the photovoltaic energy unit in real time. The data is analyzed and decided by the intelligent control and decision-making system in the information management center to determine the activation and deactivation of the backup power supply.

2. A method for treating wastewater using the carbon sink-type rural domestic wastewater resource recovery device as described in claim 1, characterized in that... Follow these steps: I. Input Water Quality Control After the wastewater enters the regulating tank (7), it is stirred together with the internal circulating water, including the concentrated water from the filter membrane and the water from the microalgae centrifuge. The concentration of N / P nutrients and pH value of the wastewater in the regulating tank are obtained in real time through an online monitoring probe and controlled under the following conditions: ammonia nitrogen 30-50 mg / L, total phosphorus 5-10 mg / L, and pH 7.6-8.

2. The microalgae growth environment is controlled under the following conditions: ambient temperature 26-33℃, carbon dioxide volume fraction 0.03%-0.04%, and light intensity 3500 Lux-4000 Lux. II. Wastewater Treatment in Biological Carbon Sequestration Unit Wastewater in the equalization tank enters the biological carbon sequestration system at a stable flow rate, where wastewater purification and biological carbon sequestration are carried out synergistically. This process is mainly achieved through the following three steps: (1) Preparation of carbon fixation materials The prepared adsorbent material is mounted on the rotating reaction device. Based on the water quality data collected by the data management center, intelligent water quality simulation is carried out. After a certain ratio of bacterial and algal mixed preparation is expanded and cultured, it is acclimated and cultured in the simulated water quality sewage. The acclimated carbon fixation agent is sprayed onto the mounted adsorbent material by the spray pipe (12) connected to the acclimation algae liquid tank (10). After the adsorbent material adsorbs bacterial and algal symbiotic organisms to form a bacterial and algal biofilm layer, it is used as a carbon fixation material suitable for the current water quality, namely carbon fixation bacterial and algal biofilm (14). The carbon-fixing bacterial agent consists of 5-15 parts of nitrifying bacteria, 4-8 parts of Bacillus, 1-2 parts of photosynthetic bacteria, 5-15 parts of Chlorella, and 2-5 parts of Scenedesmus, with the weight ratio of bacterial raw materials to microalgae raw materials being 1:0.28-2. The bacterial strains are nitrifying bacteria, Bacillus, and photosynthetic bacteria; the microalgae are Chlorella and Scenedesmus. The nitrifying bacteria are one or more of the following: Nitrifying Bacillus, Nitrifying Cocci, and Nitrifying Spirochetes. The Bacillus species mentioned is CGMCC 1.9083 Bacillus subtilis; The photosynthetic bacteria is Rhodopseudomonas, coded as ACCC 10650; The Chlorella mentioned is Chlorella proteoglycans, coded as FACHB-1227 or GY-D26; The described Scenedesmus is *Scenedesmus obliquus*, coded as FACHB-416 or FACHB-417; Methods for large-scale cultivation of bacterial-algal mixed preparations: S1. Mixing: Under aseptic conditions, the bacterial raw material and the microalgae raw material are mixed and centrifuged at 12000-15000 r / min to remove the supernatant, thus obtaining the bacterial-algae mixed preparation. S2. Large-scale culture: Under the conditions of temperature 26-33℃, pH 7.5-8.5, and light-dark ratio of 3:1 alternating, the bacterial-algae mixture was mixed with BG11 standard culture medium and cultured for 3-5 days for large-scale culture. The method for preparing the carbon-fixing bacterial agent is as follows: the bacterial-algae mixture prepared by scaling up the culture in steps S1 and S2 is added to unsterilized simulated wastewater at a ratio of 1:20-25 for acclimatization treatment. The method for preparing the adsorbent material is as follows: Soak the adsorbent material in simulated wastewater for 15-20 hours, then rinse it with ultrapure water 3-5 times, then soak it again for 6-8 hours, rinse it with ultrapure water, and then dry it in a natural environment to obtain the prepared adsorbent material. (2) Synergistic effect of biological carbon sequestration and wastewater purification The adsorbent material is arranged in a serpentine shape on the conveyor shaft (13) of the biological carbon fixation unit; the lower conveyor shaft (13) and the carbon-fixing bacteria and algae biofilm (14) are both submerged below the liquid surface of the baffle tank (16). Driven by the conveyor shaft, the lower carbon-fixing bacteria and algae biofilm rotates out of the water surface, and the stagnant sewage forms a nutrient layer liquid. The sewage in the regulating tank (7) flows into the baffle tank (16) at a flow rate of 0.5-0.6 m / s. The "water-moving membrane movement" state allows the carbon-fixing bacteria and algae biofilm (14) to absorb nitrogen and phosphorus nutrients in the sewage multiple times, fix carbon dioxide to form bacteria and algae biomass, and achieve synergistic biological carbon fixation sewage purification. When the biofilm layer on the carbon-fixing bacteria and algae biofilm (14) grows to a thickness of 0.1-0.3 mm, it is scraped off by an automatic harvester (15) with a 15% slope. The biomass of bacteria and algae is collected by the harvester collection tank into a microalgae centrifuge (17). Carbon-fixing bacteria are added to the algae acclimatization liquid tank (10). The spraying time is set to within 8 hours after harvesting. The second automatic metering valve (11) is opened and closed to automatically spray the harvested carbon-fixing bacteria and algae biofilm through the spray pipe (12) to continue the continuous carbon fixation and wastewater synergistic purification reaction. (3) Resource utilization of by-products The harvested bacteria and algae were centrifuged and dehydrated using a microalgae centrifuge (17). The water content of the harvested bacteria and algae after dehydration was 45%. The by-products were utilized as follows: 1) Pre-conditioning: Input 15-23 parts of sludge and 8-20 parts of straw powder into the mixing system to obtain S1, with the moisture content controlled at 60%-70%; then take 6-12 parts of fungal and algal harvested material and input it into the mixing system to mix with S1 obtained in the above step again for pre-conditioning to obtain mixture S2, with the moisture content controlled at 65%-75%; The harvested bacteria and algae are harvested and dehydrated biomass after centrifugation, with a moisture content of 45%-50%. The straw powder is one or more of the commercially available wheat straw, rice straw, peanut vines, and bean straw, dried and with a particle size of 80-100 mesh; The sludge is generated from the pretreatment stage connected to the device, and the sludge has a moisture content of 75-85%. 2) Aerobic fermentation: The pre-treated mixture S2 from step 1) is fed into the silo through the feed system. It is stirred by a propeller agitator and air is introduced by a blower for aerobic fermentation. The blower and agitator are controlled by the fermentation system's time controller, and the stirring and aeration frequency is controlled to be 5-8 days. The moisture content of the mixture S2 in the fermentation system is controlled at 65-75%. No nitrogen or phosphorus elements need to be added during the fermentation process. After 20-28 days of aerobic fermentation, when the pH value is stable between 7.5 and 8.3, the fermented cooked material S3 is obtained. 3) Extrusion Molding: The clinker S3 obtained in step 2) is discharged from the fermentation system outlet and introduced into the feeding hopper of the molding system, and then compressed in the compression chamber to obtain S4; the compressed shape includes cylinders and cuboids, with a volume of 1570-9216 cm³. 3 The moisture content is 30%-45%. The ratio of radius to thickness of the cylinder is 2:1, with a radius of 10-16cm and a thickness of 5-8cm. The length-width-height ratio of the cuboid is 6:3:1, with a length of 30-48cm, a width of 15-24cm, and a thickness of 5-8cm. 4) Drying: The S4 blocks formed in step 3) are subjected to rapid drying for 8-20 hours. The resulting product has a moisture content of 10-15%, a water absorption of 40%-50%, and a density of 0.8-1.4 g / cm³. 3 III. Physical Purification Unit Wastewater enters the front end of the plant cultivation nutrient solution tank (20) through the outlet of the baffle tank (16) via the opening and closing of the fourth self-controlled metering valve (19). It is first filtered by the microfiltration membrane module (21) to remove naturally fallen bacteria and algae symbiotic organisms and other impurities. The bacteria and algae mud on the microfiltration membrane module is recycled by rinsing. After filtration, the wastewater is disinfected by the LED ultraviolet lamp group (22) at the bottom of the rear end of the plant cultivation nutrient solution tank, which effectively prevents the bacteria in the wastewater from affecting the growth of hydroponic plants. IV. Cultivation Unit The wastewater in the plant cultivation nutrient solution tank (20) after physical purification is pumped into the longitudinal pipe of the liquid delivery main frame (24) by the metering circulation pump (23). The water is then transported from the longitudinal pipe to the transverse pipe and further to each hydroponic support (25). Aloe vera is planted in the disc-shaped water-absorbing substrate tank (26) connected to the hydroponic support. The liquid level in the disc-shaped water-absorbing substrate tank is controlled at 2 / 3. The wastewater after the plant absorbs nutrients flows to the plant cultivation nutrient solution tank (20) by gravity, forming a repeated circulation system to achieve zero wastewater discharge.

Images