Micro-processing resource sewage treatment method and device

Abstract

This invention relates to the field of wastewater treatment technology and discloses a micro-processing resource-based wastewater treatment method and apparatus. The method includes the following steps: (1) after removing oil from domestic wastewater, it is subjected to microbial anaerobic fermentation to obtain pre-treated water; (2) the pre-treated water is sterilized and disinfected using a visible light catalytic bactericide to obtain purified water; the visible light catalytic bactericide is a porous phenolic resin with interconnected channels and visible light catalytic activity, wherein the interconnected channels are formed by melting fibers with a melting point below 150°C; (3) the purified water is used as fertilizer for irrigation. Using the method of this invention, while effectively reducing the COD and N and P content of wastewater, a portion of organic matter and N and P nutrients can be retained. Furthermore, it can effectively kill pathogens in wastewater, and the resulting purified water can be used as fertilizer for irrigation, providing water and nutrients for plants.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a micro-processing resource-based wastewater treatment method and apparatus. Background Technology

[0002] Domestic sewage refers to wastewater discharged by residents in their daily lives, including kitchen wastewater, toilet wastewater, and washing wastewater. It has a high chemical oxygen demand (COD) and nitrogen and phosphorus content. Direct discharge can cause eutrophication and black and smelly water bodies. Therefore, domestic sewage treatment is an important aspect of improving the water environment.

[0003] Traditional domestic sewage treatment systems use septic tanks, where sewage is naturally treated before being discharged or used for irrigation. This method of sewage treatment is decentralized, occurring on a residential basis, making effective sewage collection and treatment monitoring impossible and increasing the risk of unauthorized discharge. Furthermore, when used for fertilization, it is often done manually, resulting in low automation and low recycling rates. Additionally, it does not treat microorganisms and bacteria, posing a risk of spreading infectious diseases.

[0004] Centralized wastewater treatment systems typically employ anaerobic-aerobic (AO) or anaerobic-anoxic-aerobic (AAO) processes to thoroughly decompose organic matter and reduce nitrogen and phosphorus content in the wastewater to meet discharge standards before direct discharge into rivers, lakes, and other natural bodies of water. This method involves deep treatment of wastewater before discharge, resulting in high operating costs, complex equipment, and the inability to fully utilize nutrients (such as nitrogen and phosphorus) in the wastewater. Summary of the Invention

[0005] To address the aforementioned technical problem—that existing biological wastewater treatment devices struggle to fully utilize the nutrients in wastewater—this invention provides a micro-processing resource-based wastewater treatment method and apparatus. Using this method, while effectively reducing the COD and N / P content of wastewater, some organic matter and N / P nutrients are retained. Furthermore, it effectively kills pathogens in the wastewater, and the resulting purified water can be used as fertilizer for irrigation, providing water and nutrients to plants.

[0006] The specific technical solution of this invention is as follows:

[0007] In a first aspect, the present invention provides a microprocessor-based wastewater treatment method, comprising the following steps:

[0008] (1) After removing oil from domestic sewage, microbial anaerobic fermentation is carried out to obtain pre-treated water;

[0009] (2) A visible light catalytic bactericide is used to sterilize and disinfect the pre-treated water to obtain purified water; the visible light catalytic bactericide is a porous phenolic resin with interconnected channels and visible light catalytic activity, and the interconnected channels are formed by melting out of fibers with a melting point of less than 150°C.

[0010] (3) Use purified water as fertilizer for irrigation.

[0011] This invention employs a micro-treatment process for domestic sewage, specifically anaerobic fermentation by microorganisms. This effectively reduces the COD and N / P content of the sewage without completely decomposing organic matter, while retaining a certain amount of N and P nutrients. When used for irrigation, fertilization can be carried out simultaneously, achieving resource utilization of domestic sewage. Furthermore, domestic sewage contains some pathogens and viruses. Direct irrigation after anaerobic fermentation poses a risk of infectious disease transmission. This invention eliminates this risk by sterilizing and disinfecting the pre-treated water.

[0012] In addition, some phenolic resins with visible light photocatalytic activity have been reported (e.g., Song Xiao. Preparation and photocatalytic sterilization performance of phenolic resin photocatalysts [D]. Harbin Institute of Technology, 2019. DOI:10.27061 / d.cnki.ghgdu.2019.006148.). These resins can generate free radicals under visible light, thereby exerting a sterilization and disinfection effect. Compared with chlorination and ozone sterilization methods, they have the advantage of not producing secondary pollution, and compared with ultraviolet sterilization, they can reduce energy consumption. However, existing phenolic resin visible light photocatalysts have the following problems: when the particle size is small, they have a better sterilization and disinfection effect, but when used in wastewater treatment, they are easily lost with the water flow; when the particle size is large, they are easily intercepted, preventing them from being lost with the water flow, but the specific surface area is small, resulting in poor sterilization and disinfection effect.

[0013] This invention utilizes fiber melting to form interconnected channels within phenolic resin. These interconnected channels facilitate the adsorption of pathogens from wastewater into the phenolic resin, allowing free radicals generated by the resin under visible light to easily contact the pathogens. Simultaneously, these interconnected channels allow visible light to penetrate, increasing the contact area between the phenolic resin and visible light. Through this method, the bactericidal and disinfecting effect of phenolic resin under sunlight can be improved, enabling it to maintain its effectiveness even at larger sizes.

[0014] Preferably, in step (2), the preparation step of the visible light catalytic bactericide includes: adding fibers with a melting point below 150°C during the preparation of phenolic resin visible light catalyst (i.e., phenolic resin with photocatalytic activity) through polymerization reaction to obtain fiber-phenolic resin composite; and melting the fibers by heating and vacuuming to obtain the visible light catalytic bactericide.

[0015] Phenolic resin visible light catalysts can be prepared using existing methods. This invention, however, involves adding fibers with a low melting point during the preparation of the phenolic resin visible light catalyst. After forming the fiber-phenolic resin composite, heating and vacuuming cause the fibers to melt out of the phenolic resin, thus creating interconnected channels within the phenolic resin.

[0016] Preferably, in step (2), TiO2 is attached to the pore walls of the porous phenolic resin.

[0017] After a period of use, visible light photocatalytic bactericides accumulate a large number of pathogens within their pores, affecting their adsorption of pathogens in wastewater and the contact between phenolic resin and visible light, thus weakening their bactericidal and disinfection effects. To ensure the visible light photocatalytic bactericide maintains good efficacy even after long-term use, this invention attaches TiO2 to its pore walls. Under ultraviolet light irradiation, TiO2 exhibits excellent photocatalytic activity, accelerating the decomposition and shedding of pathogens attached to the pores. Therefore, the visible light photocatalytic bactericide can be periodically irradiated with ultraviolet light, or when the bactericidal and disinfection effects decline, to restore its effectiveness. Furthermore, while restoring the effectiveness of the visible light photocatalytic bactericide through ultraviolet light irradiation, the wastewater can also be disinfected using ultraviolet light, allowing the wastewater treatment system to operate continuously without the need to remove the visible light photocatalytic bactericide from the device.

[0018] Preferably, in step (2), the preparation step of the visible light catalytic bactericide includes:

[0019] (A) A layer of TiO2 is deposited on the surface of a fiber with a melting point below 150°C to obtain fiber@TiO2;

[0020] (B) Graft an aminosilane coupling agent onto the surface of fiber @TiO2 to obtain fiber @TiO2-NH2;

[0021] (C) In the process of preparing phenolic resin visible light catalyst (i.e. phenolic resin with photocatalytic activity) by polymerization reaction, fiber@TiO2-NH2 is added to obtain fiber-phenolic resin composite; the fiber is melted out by heating and vacuuming to obtain the visible light catalytic bactericide.

[0022] In the above preparation process, "fiber@TiO2" refers to the fiber surface with TiO2 particles attached; "fiber@TiO2-NH2" refers to the fiber surface with TiO2 particles attached, and the TiO2 particles are grafted with amino groups; "fiber-phenolic resin complex" refers to the complex of fiber and phenolic resin.

[0023] In step (B), an aminosilane coupling agent is used to covalently graft amino groups onto the TiO2 surface. In step (C), fibers @TiO2-NH2 are added during the preparation of the phenolic resin visible light catalyst. The polymerized phenolic resin partially encapsulates the TiO2 surface, with TiO2 embedded within the phenolic resin. Simultaneously, the aldehyde-amine condensation reaction between the amino and aldehyde groups enables TiO2 to be covalently linked to the phenolic resin, reducing the amount of TiO2 carried out during subsequent fiber melting. After the fiber-phenolic resin composite is formed, melting the fibers creates interconnected channels within the phenolic resin, with TiO2 embedded in the pore walls.

[0024] Preferably, the fiber has a diameter of 200–500 μm and a length of 3–10 cm.

[0025] Preferably, the visible light catalytic bactericide has a size of 1-5cm × 1-5cm × 1-5cm.

[0026] Preferably, the mass ratio of the phenolic resin visible light catalyst to the fiber is 1:0.1 to 0.2.

[0027] In the above mass ratio, the mass of the phenolic resin visible light catalyst is calculated based on the complete reaction of the phenolic monomer and the aldehyde monomer.

[0028] Preferably, the mass ratio of the fiber in step (A) to the aminosilane coupling agent in step (B) is 1:0.05 to 0.10.

[0029] Preferably, in step (A), TiO2 is deposited by atomic layer deposition, the chamber temperature is set to 145-150℃, and a total of 30-50 cycles are performed. The process of each cycle is as follows: using an inert gas as a carrier gas, tetraisopropyl titanate is introduced for 0.1-0.3s, and then the inert gas is purged after 5-8s; using an inert gas as a carrier gas, deionized water is introduced for 0.1-0.2s, and then the inert gas is purged after 5-8s.

[0030] Preferably, in step (C), the specific process of melting the fiber by heating and vacuuming includes: heating at 120-130°C for 10-20 minutes, then vacuuming to a pressure of 1-10 kPa and maintaining it for 3-5 hours.

[0031] Preferably, in step (1), during the anaerobic fermentation of the microorganisms, the dissolved oxygen content in the wastewater is controlled to be no higher than 0.2 mg / L.

[0032] Preferably, in step (2), during the sterilization and disinfection of the pre-treated water, the pre-treated water is aerated at a rate of 5-10 L / min.

[0033] Secondly, the present invention provides a micro-processing resource-based wastewater treatment device using the method described above, comprising a sedimentation and oil separation tank, a micro-processing tank, a water and fertilizer storage tank containing anaerobic activated sludge, and a sterilization and disinfection device containing an ultraviolet light source and the visible light catalytic bactericide, connected in sequence; the outer wall of the sterilization and disinfection device is transparent; the sterilization and disinfection device is connected to a water and fertilizer irrigation pipe.

[0034] The operation process of the above-mentioned device is as follows: domestic sewage is first fed into the sedimentation and grease trap to remove sediment and grease, and then enters the micro-treatment tank. Under the action of anaerobic activated sludge, microorganisms carry out anaerobic fermentation, which can remove some organic matter and nitrogen and phosphorus elements from the sewage. Then it is stored in the water and fertilizer storage tank. When irrigation is needed, it enters the sterilization and disinfection equipment from the water and fertilizer storage tank to kill pathogens before being used for irrigation.

[0035] In sterilization and disinfection equipment, visible light-emitting bactericides can be used for sterilization and disinfection when there is sufficient sunlight; when sunlight is insufficient, ultraviolet (UV) light sources can be turned on to use UV light for sterilization and disinfection. Furthermore, when the visible light-emitting bactericide uses the previously mentioned scheme where TiO2 is attached to the pore walls, the UV light source can be turned on periodically, or when a large number of pathogens adhere to the pores causing a decrease in sterilization effect, to enhance the photocatalytic activity of TiO2, accelerate the decomposition and shedding of pathogens attached to the pore walls, thereby restoring the sterilization effect of the visible light-emitting bactericide. Simultaneously, UV light can be used to sterilize and disinfect wastewater. Through these methods, the sterilization and disinfection equipment does not need to be shut down when sunlight is insufficient, or during the process of restoring the sterilization effect of the visible light-emitting bactericide, allowing for continuous wastewater treatment.

[0036] Preferably, the sedimentation and oil separation tank includes a sedimentation zone and an oil separation zone separated by a first partition; the oil separation zone is separated from the microtreatment tank by a second partition with an opening; the sedimentation zone and the oil separation zone are connected by a guide pipe, and the outlet of the guide pipe is located at the upper part of the oil separation zone; an oil separation plate is provided in the oil separation zone, the lower end of the oil separation plate is lower than the outlet of the guide pipe and the opening on the second partition, and the upper end is higher than the outlet of the guide pipe and the opening on the second partition.

[0037] In the above structural design, after the sediment in the sedimentation zone is removed, the wastewater flows into the oil separator through the guide pipe. When the wastewater flows from the oil separator into the micro-treatment tank through the opening on the second baffle, the oil layer on the surface of the wastewater can be removed by the oil separator.

[0038] Preferably, the sterilization and disinfection equipment is provided with an overflow discharge port.

[0039] Preferably, the microprocessor-based wastewater treatment device further includes a waste gas treatment device connected to the sedimentation and oil separation tank, the microprocessor tank, and the water and fertilizer storage tank.

[0040] Preferably, the water-fertilizer tank is equipped with a reuse pump connected to the sterilization and disinfection equipment.

[0041] Water and fertilizer irrigation can be controlled using a reuse pump. With this design, an automatic control system can be used to determine whether irrigation is needed based on soil moisture, thereby controlling the operation of the reuse pump to achieve automatic irrigation.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] (1) The present invention adopts a wastewater micro-treatment process, which effectively reduces the COD and N and P content of domestic sewage through microbial anaerobic fermentation, while retaining some organic matter and N and P nutrients. The treated water can be used as fertilizer for irrigation and provides nutrients for plant growth.

[0044] (2) By melting fibers, the present invention can form interconnected channels in phenolic resin, which is conducive to the contact between free radicals generated by phenolic resin and pathogens, and increases the contact area between phenolic resin and visible light, thereby improving the bactericidal and disinfection effect of phenolic resin under sunlight.

[0045] (3) In this invention, TiO2 is attached to the pore walls of porous phenolic resin, which can remove pathogens attached to the pore walls by ultraviolet light irradiation, restore the sterilization and disinfection effect of visible light catalytic bactericide, and can continuously sterilize and disinfect sewage with ultraviolet light during the process without shutting down the sewage treatment system. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a microprocessor-based wastewater treatment device according to the present invention.

[0047] The attached diagram is labeled as follows: Sedimentation and oil separation tank 1, sedimentation zone 11, oil separation zone 12, first baffle 13, guide pipe 14, oil separator 15, sewage inlet 16, micro-treatment tank 2, water and fertilizer storage tank 3, reuse pump 31, sterilization and disinfection equipment 4, overflow discharge outlet 41, water and fertilizer irrigation outlet 42, second baffle 5, third baffle 6, waste gas treatment equipment 7, cleaning outlet 8. Detailed Implementation

[0048] The present invention will be further described below with reference to embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in the present invention, and the scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

[0049] General Implementation Examples

[0050] A micro-processor-based wastewater treatment method includes the following steps:

[0051] (1) After removing oil from domestic sewage, microbial anaerobic fermentation is carried out to obtain pre-treated water;

[0052] (2) A visible light catalytic bactericide is used to sterilize and disinfect the pre-treated water to obtain purified water; the visible light catalytic bactericide is a porous phenolic resin with interconnected channels and visible light catalytic activity, and the interconnected channels are formed by melting out of fibers with a melting point of less than 150°C.

[0053] (3) Use purified water as fertilizer for irrigation.

[0054] In one specific implementation, during step (1), the dissolved oxygen content in the wastewater is controlled to be no higher than 0.2 mg / L during the anaerobic fermentation process of the microorganisms.

[0055] As a specific implementation, in step (2), the preparation step of the visible light catalytic bactericide includes: adding fibers with a melting point below 150°C during the preparation of a phenolic resin visible light catalyst by polymerization reaction to obtain a fiber-phenolic resin composite; and melting the fibers by heating and vacuuming to obtain the visible light catalytic bactericide.

[0056] In the above specific embodiments, optionally:

[0057] The fiber has a diameter of 200–500 μm and a length of 3–10 cm;

[0058] The visible light catalytic bactericide has a size of 1-5cm × 1-5cm × 1-5cm;

[0059] The mass ratio of the phenolic resin visible light catalyst to the fiber is 1:0.1 to 0.2.

[0060] In one specific embodiment, in step (2), TiO2 is attached to the pore walls of the porous phenolic resin, and the preparation steps of the visible light catalytic bactericide include:

[0061] (A) A layer of TiO2 is deposited on the surface of a fiber with a melting point below 150°C to obtain fiber@TiO2;

[0062] (B) Graft an aminosilane coupling agent onto the surface of fiber @TiO2 to obtain fiber @TiO2-NH2;

[0063] (C) In the process of preparing a visible light catalyst from a phenolic resin by polymerization reaction, fiber@TiO2-NH2 is added to obtain a fiber-phenolic resin composite; the fiber is melted out by heating and vacuuming to obtain the visible light catalytic bactericide.

[0064] In the above specific embodiments, optionally:

[0065] The fiber has a diameter of 200–500 μm and a length of 3–10 cm;

[0066] The visible light catalytic bactericide has a size of 1-5cm × 1-5cm × 1-5cm;

[0067] The mass ratio of the phenolic resin visible light catalyst to the fiber is 1:0.1 to 0.2;

[0068] In one specific embodiment, the mass ratio of the fiber in step (A) to the aminosilane coupling agent in step (B) is 1:0.05 to 0.10;

[0069] In step (A), TiO2 is deposited using atomic layer deposition. The chamber temperature is set to 145–150 °C, and the process is repeated 30–50 times. The process of each cycle is as follows: using an inert gas as the carrier gas, tetraisopropyl titanate is introduced for 0.1–0.3 s, and then the inert gas is purged after 5–8 s; using an inert gas as the carrier gas, deionized water is introduced for 0.1–0.2 s, and then the inert gas is purged after 5–8 s.

[0070] The specific process of step (B) includes: mixing the aminosilane coupling agent with reaction solvent A, stirring for 20-40 min to prepare a mixture; dispersing the fiber @TiO2 into reaction solvent B, adding the mixture, reacting at 70-80℃ for 3-5 h, separating the product, and obtaining the fiber @TiO2-NH2;

[0071] The specific process of step (C) includes: dissolving phenolic monomers and catalysts in water, adding fiber@TiO2-NH2, mixing well, then adding aldehyde monomers to carry out polymerization reaction to form a gel, heating the gel at 120-130℃ for 10-20 min, then evacuating to a pressure of 1-10 kPa and maintaining it for 3-5 h, and then continuing to vacuum dry at 90-100℃ for 5-8 h to obtain a visible light catalytic bactericide.

[0072] In one specific implementation, in step (2), during the sterilization and disinfection of the pre-treated water, the pre-treated water is aerated at a rate of 5-10 L / min.

[0073] A micro-processing resource-based wastewater treatment device employing the aforementioned method includes a sedimentation and oil separation tank 1, a micro-processing tank 2, a water and fertilizer storage tank 3 containing anaerobic activated sludge, and a sterilization and disinfection device 4 containing an ultraviolet light source and the aforementioned visible light catalytic bactericide, connected in sequence; the outer wall of the sterilization and disinfection device 4 is transparent; the sterilization and disinfection device 4 is connected to a water and fertilizer irrigation pipe.

[0074] In one specific embodiment, the sedimentation and oil separation tank 1 includes a sedimentation zone 11 and an oil separation zone 12 separated by a first partition 13; the oil separation zone 12 is separated from the microtreatment tank 2 by a second partition 5 with an opening; the sedimentation zone 11 and the oil separation zone 12 are connected by a guide pipe 14, and the outlet of the guide pipe 14 is located at the upper part of the oil separation zone 12; an oil separation plate 15 is provided in the oil separation zone 12, the lower end of the oil separation plate 15 is lower than the outlet of the guide pipe 14 and the opening on the second partition 5, and the upper end is higher than the outlet of the guide pipe 14 and the opening on the second partition 5.

[0075] In one specific implementation, the water-fertilizer tank 3 is equipped with a reuse pump 31 that is connected to the sterilization and disinfection equipment 4.

[0076] In one specific embodiment, the sterilization and disinfection equipment 4 is provided with an overflow discharge port 41.

[0077] As one specific implementation, the microprocessor-based wastewater treatment device also includes a waste gas treatment device 7 connected to the sedimentation and oil separation tank 1, the microprocessor tank 2, and the water and fertilizer storage tank 3. Specific Implementation

[0079] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless otherwise specified, the raw materials and equipment used in this invention are conventional in the art and can be obtained through conventional commercial means; unless otherwise specified, the methods used in this invention are conventional methods in the art.

[0080] The abbreviations used in the following embodiments have the following meanings:

[0081] PE: Polyethylene;

[0082] KH550: γ-aminopropyltriethoxysilane;

[0083] PE@TiO2 fiber: TiO2 particles are attached to the surface of PE fiber;

[0084] PE@TiO2-NH2 fiber: TiO2 particles are attached to the surface of PE fiber, and amino groups are grafted onto the surface of the TiO2 particles.

[0085] Example 1

[0086] The microprocessor-based wastewater treatment device structure used in this embodiment is as follows: Figure 1As shown, the specific configuration is as follows: It consists of a sedimentation and oil-water separation tank 1, a micro-treatment tank 2, a water and fertilizer storage tank 3, and a sterilization and disinfection device 4 connected in sequence. The sedimentation and oil-water separation tank 1 comprises a sedimentation zone 11 and an oil-water separation zone 12. A wastewater inlet 16 is located at the top of the sedimentation zone 11. The sedimentation zone 11 and the oil-water separation zone 12 are separated by a first partition 13 and connected by a guide pipe 14 passing through the first partition 13. The inlet and outlet of the guide pipe 14 are located at the bottom of the sedimentation zone 11 and the top of the oil-water separation zone 12, respectively. An oil-water separating plate 15 is located at the top of the oil-water separation zone 12. The oil-water separation zone 12 is separated from the micro-treatment tank 2 by a second partition 5 with an opening at the top. The oil-water separating plate 15 is located between the outlet of the guide pipe 14 and the opening of the second partition 5, with the lower end of the oil-water separating plate 15 lower than the outlet of the guide pipe 14 and the opening on the second partition 5, and the upper end higher than the outlet of the guide pipe 14 and the opening on the second partition 5. Anaerobic activated sludge is contained in the sludge storage tank 3. The sludge storage tank 3 is separated from the sterilization and disinfection equipment 4 by a third partition 6 with an opening at the top. The sludge storage tank 3 has an overflow port 32 at the top connected to the sterilization and disinfection equipment 4, and a reuse pump 31 at the bottom connected to the sterilization and disinfection equipment 4. The sterilization and disinfection equipment 4 contains an ultraviolet light source (ultraviolet lamp), a visible light catalytic bactericide, and an aeration device. The volume of the visible light catalytic bactericide is 1 / 3 of the effective volume of the sterilization and disinfection equipment 4. The outer wall of the sterilization and disinfection equipment 4 is made of transparent glass and has an overflow discharge port 41 and a sludge irrigation port 42, which is connected to a sludge irrigation pipe. The sedimentation zone 11, the oil-water separator 12, the microtreatment tank 2, and the sludge storage tank 3 are all connected to the waste gas treatment equipment 7. The tops of the sedimentation and oil-water separator 1, the microtreatment tank 2, and the sludge storage tank 3 are all equipped with cleaning ports 8.

[0087] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0088] (A) PE fibers (200 μm in diameter and 3 cm in length) were placed in an atomic layer deposition (ALD) apparatus. The chamber temperature was set to 150 °C, and 30 cycles were performed. The process for each cycle was as follows: nitrogen was used as the carrier gas, and tetraisopropyl titanate was introduced for 0.3 s, followed by purging with an inert gas for 20 s after 8 s; nitrogen was used as the carrier gas, and deionized water was introduced for 0.2 s, followed by purging with an inert gas for 20 s after 8 s. After ALD, PE@TiO2 fibers were obtained.

[0089] (B) KH550, ethanol, and water were mixed at a mass ratio of 1:3.6:0.4, with the amount of KH550 being 8% of the mass of the PE fibers in step (A). The mixture was stirred for 30 min to obtain a solution. The PE@TiO2 fibers obtained in step (A) were dispersed in ethanol at a mass ratio of 1:20. The solution was then added to the ethanol, and the mixture was refluxed at 75 °C for 4 h. The mixture was then filtered, washed with water, and dried to obtain PE@TiO2-NH2 fibers.

[0090] (C) Add phloroglucinol, sodium carbonate, and water in a mass ratio of 1:0.01:10 to the mold. The amount of phloroglucinol is 5 times the mass of the PE fiber in step (A). After heating and dissolving, add the PE@TiO2-NH2 fiber obtained in step (B), stir evenly, and then add formaldehyde with a molar amount 3 times that of phloroglucinol. Stir at 55°C until polymerization begins, and then let stand at 55°C for 4 hours to obtain a gel. Heat the gel at 125°C for 15 minutes, then evacuate to a pressure of 5 kPa and maintain for 4 hours to melt out the PE fiber. Then continue to vacuum dry at 100°C for 6 hours to obtain a visible light catalytic bactericide with a size of approximately 1 cm × 1 cm × 3 cm.

[0091] The wastewater treatment device using microprocessor-based resource recovery technology in this embodiment is used for wastewater treatment. The specific steps are as follows:

[0092] (1) Domestic sewage is fed into a sedimentation and oil-water separator through a sewage inlet. Sediments and grease are removed in the sedimentation zone and the oil-water separation zone to obtain pretreated water.

[0093] (2) The pretreated water is introduced into the micro-treatment tank for anaerobic fermentation by microorganisms. During this period, the dissolved oxygen content in the water is controlled at 0.1-0.2 mg / L. The HRT in the micro-treatment tank is 3 days. The pre-treated water is then stored in the water-fertilizer storage tank.

[0094] (3) When irrigation is required, the pre-treated water in the water and fertilizer treatment tank is pumped to the sterilization and disinfection equipment via a reuse pump. Under sunlight, the water is sterilized and disinfected using a visible light catalytic sterilizer. During this process, the water is stirred by aeration. The gas introduced is air, and the aeration rate is 10L / min. The HRT in the sterilization and disinfection equipment is 5h, and purified water is obtained.

[0095] (4) Use purified water as fertilizer to irrigate farmland.

[0096] Example 2

[0097] The structure and wastewater treatment steps of the microprocessor-based wastewater treatment device in this embodiment are the same as those in Embodiment 1.

[0098] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0099] (A) PE fibers (500 μm in diameter and 10 cm in length) were placed in an atomic layer deposition (ALD) apparatus. The chamber temperature was set to 150 °C, and 50 cycles were performed. The process for each cycle was as follows: nitrogen was used as the carrier gas, and tetraisopropyl titanate was introduced for 0.2 s, followed by purging with an inert gas for 20 s after 6 s; nitrogen was used as the carrier gas, and deionized water was introduced for 0.1 s, followed by purging with an inert gas for 20 s after 6 s. After ALD, PE@TiO2 fibers were obtained.

[0100] (B) KH550, ethanol, and water were mixed at a mass ratio of 1:3.6:0.4, with the amount of KH550 being 10% of the mass of the PE fibers in step (A). The mixture was stirred for 20 minutes to obtain a solution. The PE@TiO2 fibers obtained in step (A) were dispersed in ethanol at a mass ratio of 1:20. The solution was then added to the ethanol, and the mixture was refluxed at 70°C for 5 hours. The mixture was then filtered, washed with water, and dried to obtain PE@TiO2-NH2 fibers.

[0101] (C) Add phloroglucinol, sodium carbonate, and water in a mass ratio of 1:0.01:10 to the mold. The amount of phloroglucinol is 4 times the mass of the PE fiber in step (A). After heating and dissolving, add the PE@TiO2-NH2 fiber obtained in step (B), stir evenly, and then add formaldehyde with a molar amount 3 times that of phloroglucinol. Stir at 50°C until polymerization begins, and then let stand at 50°C for 5 hours to obtain a gel. Heat the gel at 120°C for 20 minutes, then evacuate to a pressure of 1 kPa and maintain for 5 hours to melt out the PE fiber. Then continue to vacuum dry at 100°C for 5 hours to obtain a visible light catalytic bactericide with a size of approximately 2 cm × 2 cm × 4 cm.

[0102] Example 3

[0103] The structure and wastewater treatment steps of the microprocessor-based wastewater treatment device in this embodiment are the same as those in Embodiment 1.

[0104] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0105] (A) PE fibers (300 μm in diameter and 5 cm in length) were placed in an atomic layer deposition (ALD) apparatus. The chamber temperature was set to 145 °C, and 40 cycles were performed. The process for each cycle was as follows: nitrogen was used as the carrier gas, and tetraisopropyl titanate was introduced for 0.1 s, followed by purging with an inert gas for 20 s after 5 s; nitrogen was used as the carrier gas, and deionized water was introduced for 0.1 s, followed by purging with an inert gas for 20 s after 5 s. After ALD, PE@TiO2 fibers were obtained.

[0106] (B) KH550, ethanol, and water were mixed at a mass ratio of 1:3.6:0.4, with the amount of KH550 being 5% of the mass of the PE fibers in step (A). The mixture was stirred for 40 min to obtain a solution. The PE@TiO2 fibers obtained in step (A) were dispersed in ethanol at a mass ratio of 1:20. The solution was then added to the ethanol, and the mixture was refluxed at 80 °C for 3 h. The mixture was then filtered, washed with water, and dried to obtain PE@TiO2-NH2 fibers.

[0107] (C) Add phloroglucinol, sodium carbonate, and water in a mass ratio of 1:0.01:10 to the mold. The amount of phloroglucinol is 8 times the mass of the PE fiber in step (A). After heating and dissolving, add the PE@TiO2-NH2 fiber obtained in step (B), stir evenly, and then add formaldehyde with a molar amount 3 times that of phloroglucinol. Stir at 60°C until polymerization begins, and then let stand at 60°C for 3 hours to obtain a gel. Heat the gel at 130°C for 10 minutes, then evacuate to a pressure of 10 kPa and maintain for 3 hours to melt out the PE fiber. Then continue vacuum drying at 100°C for 8 hours to obtain a visible light catalytic bactericide with a size of approximately 1 cm × 1 cm × 5 cm.

[0108] Example 4

[0109] The structure and wastewater treatment steps of the microprocessor-based wastewater treatment device in this embodiment are the same as those in Embodiment 1.

[0110] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0111] In a mold, phloroglucinol, sodium carbonate, and water were added in a mass ratio of 1:0.01:10. After heating and dissolving, PE fibers (0.2 times the mass of phloroglucinol) were added and stirred until homogeneous. Then, formaldehyde (3 times the molar amount of phloroglucinol) was added and stirred at 55°C until polymerization began. The mixture was then allowed to stand at 55°C for 4 hours to obtain a gel. The gel was heated at 125°C for 15 minutes, then evacuated to a pressure of 5 kPa and maintained for 4 hours to melt the PE fibers. Finally, it was vacuum dried at 100°C for 6 hours to obtain a visible light catalytic bactericide with dimensions of approximately 1 cm × 1 cm × 3 cm.

[0112] Example 5

[0113] The structure and wastewater treatment steps of the microprocessor-based wastewater treatment device in this embodiment are the same as those in Embodiment 1.

[0114] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0115] In a mold, phloroglucinol, sodium carbonate, and water were added in a mass ratio of 1:0.01:10 and heated to dissolve. Then, PE fibers and nano-TiO2 were added in amounts equal to 0.2 and 0.02 times the mass of phloroglucinol, respectively, and stirred until homogeneous. Formaldehyde, in a molar amount equal to 3 times that of phloroglucinol, was then added and stirred at 55°C until polymerization began. The mixture was then allowed to stand at 55°C for 4 hours to obtain a gel. The gel was heated at 125°C for 15 minutes, then evacuated to a pressure of 5 kPa and maintained for 4 hours to melt the PE fibers. Finally, it was vacuum dried at 100°C for 6 hours to obtain a visible light catalytic bactericide with dimensions approximately 1 cm × 1 cm × 3 cm.

[0116] Example 6

[0117] The structure and wastewater treatment steps of the microprocessor-based wastewater treatment device in this embodiment are the same as those in Embodiment 1.

[0118] The visible light catalytic bactericide used in the sterilization and disinfection equipment 4 of this embodiment is prepared through the following steps:

[0119] (A) PE fibers (200 μm in diameter and 3 cm in length) were placed in an atomic layer deposition (ALD) apparatus. The chamber temperature was set to 150 °C, and 30 cycles were performed. The process for each cycle was as follows: nitrogen was used as the carrier gas, and tetraisopropyl titanate was introduced for 0.3 s, followed by purging with an inert gas for 20 s after 8 s; nitrogen was used as the carrier gas, and deionized water was introduced for 0.2 s, followed by purging with an inert gas for 20 s after 8 s. After ALD, PE@TiO2 fibers were obtained.

[0120] (B) Add phloroglucinol, sodium carbonate, and water in a mass ratio of 1:0.01:10 to a mold. The amount of phloroglucinol is 5 times the mass of the PE fiber in step (A). After heating and dissolving, add the PE@TiO2 fiber obtained in step (A) and stir evenly. Then add formaldehyde with a molar amount 3 times that of phloroglucinol. Stir at 55°C until polymerization begins, and then let stand at 55°C for 4 hours to obtain a gel. Heat the gel at 125°C for 15 minutes, then evacuate to a pressure of 5 kPa and maintain for 4 hours to melt out the PE fiber. Then continue to vacuum dry at 100°C for 6 hours to obtain a visible light catalytic bactericide with a size of approximately 1 cm × 1 cm × 3 cm.

[0121] Comparative Example 1

[0122] The microprocessor-based wastewater treatment device in this comparative example has the same structure and wastewater treatment steps as in Example 1.

[0123] The visible light photocatalytic bactericide used in the sterilization and disinfection equipment 4 of this comparative example was prepared through the following steps:

[0124] Phloroglucinol, sodium carbonate, and water were added to a mold in a mass ratio of 1:0.01:10 and heated to dissolve. Formaldehyde, in a molar amount three times that of phloroglucinol, was then added and stirred at 55°C until polymerization began. The mixture was then allowed to stand at 55°C for 4 hours to obtain a gel. The gel was heated at 125°C for 15 minutes, then evacuated to a pressure of 5 kPa and maintained for 4 hours to melt the PE fibers. Finally, it was vacuum dried at 100°C for 6 hours to obtain a visible-light catalytic bactericide with dimensions approximately 1 cm × 1 cm × 3 cm.

[0125] Test Example 1: Treatment Effect of Domestic Sewage

[0126] Rural domestic sewage was used as the test water. The water quality was as follows: pH 7.17, COD 307 mg / L, NH3-N 35.9 mg / L, TP 5.08 mg / L, and Escherichia coli 1.3 × 10⁻⁶. 4 CFU / mL. The test water was treated using the apparatus and methods described in Examples 1-4 and Comparative Example 1, respectively, with a solar radiation intensity of 750-900 W / m² during the sterilization process. 2 The quality of the effluent from the sterilization and disinfection equipment was tested, and the results are shown in Table 1.

[0127] Table 1. Test results of effluent water quality

[0128] COD <![CDATA[NH3-N]]> TP E. coli unit mg / L mg / L mg / L CFU / mL Example 1 22 2.1 0.85 61 Example 2 18 2.7 0.74 45 Example 3 27 2.3 0.82 58 Example 4 35 2.0 0.84 104 Comparative Example 1 52 2.6 0.80 <![CDATA[8.6×10 3 ]]>

[0129] As can be seen from Table 1:

[0130] (1) In Examples 1 to 4, the effluent contains a certain amount of organic matter and N and P elements, so it can provide nutrients for plants when used for irrigation.

[0131] (2) The content of Escherichia coli in the effluent of Examples 1 to 4 was significantly lower than that in Comparative Example 1, indicating that the present invention can effectively improve the bactericidal effect of phenolic resin by introducing interconnected channels in phenolic resin.

[0132] Test Example 2: Performance Test of Visible Light Catalytic Bactericide

[0133] After preparing the visible light catalytic bactericide according to the methods in Examples 1 and 4-6, its bactericidal performance was tested. Then, using the apparatus and methods described in each example, and the test water from Test Example 1, samples were taken after the sterilization equipment had run 15 times to test the bactericidal performance of the visible light catalytic bactericide. The sterilization equipment was then shielded from light, and the ultraviolet lamp was turned on to continue wastewater treatment. After the sterilization equipment had run 5 times, samples were taken again to test the bactericidal performance of the visible light catalytic bactericide. The method for testing the bactericidal performance is as follows: Escherichia coli bacterial solution was placed in a transparent glass container, with an E. coli content of 10... 6The concentration of CFU / mL was determined by adding a visible light-catalyzed bactericide at a rate of 20 g / L. A 100W xenon lamp was used to simulate sunlight, and the container was irradiated for 3 hours. The E. coli concentration (CFU / mL) was then measured, and the sterilization rate was calculated. The results are shown in Table 2.

[0134] Table 2. Results of bactericidal performance tests of visible light photocatalytic bactericides.

[0135]

[0136] As can be seen from Table 2:

[0137] (1) Compared with Example 4, the visible light catalytic bactericide of Example 1 has significantly better bactericidal performance after regeneration, indicating that by attaching titanium dioxide to the pore wall, the effect of the visible light catalytic bactericide can be better restored by using ultraviolet light irradiation.

[0138] (2) Compared with Example 1, the visible light catalytic bactericide of Example 5 has relatively poor bactericidal performance after regeneration. This is because: in the visible light catalytic bactericide of Example 5, titanium dioxide is dispersed in phenolic resin (rather than aggregated on the pore wall), and cannot specifically remove bacteria attached to the pore wall under ultraviolet light irradiation, thus the effect of restoring the bactericidal performance of the visible light catalytic bactericide is poor.

[0139] (3) Compared with Example 1, the visible light catalytic bactericide of Example 6 has relatively poor bactericidal performance after regeneration. This is because: in the process of preparing the visible light catalytic bactericide in Example 6, an aminosilane coupling agent was not grafted onto the surface of titanium dioxide. During the fiber melting process, titanium dioxide was easily carried out, resulting in less titanium dioxide adhering to the pore wall.

[0140] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A microprocessor-based wastewater treatment method, characterized in that, Includes the following steps: S1. After removing oil from domestic sewage, it undergoes anaerobic fermentation by microorganisms to obtain pre-treated water; S2. A visible light catalytic bactericide is used to sterilize and disinfect the pre-treated water to obtain purified water. The visible light catalytic bactericide is a porous phenolic resin with interconnected channels and visible light catalytic activity. The interconnected channels are formed by melting fibers with a melting point <150℃. TiO2 is attached to the pore walls of the porous phenolic resin. The preparation steps include: depositing a layer of TiO2 on the surface of fibers with a melting point <150℃ to obtain fiber@TiO2; grafting an aminosilane coupling agent onto the surface of fiber@TiO2 to obtain fiber@TiO2-NH2; adding fiber@TiO2-NH2 during the preparation of a visible light catalytic catalyst for phenolic resin through polymerization reaction to obtain a fiber-phenolic resin composite; melting the fibers by heating and vacuuming to obtain the visible light catalytic bactericide. S3. Use purified water as fertilizer for irrigation.

2. The method according to claim 1, characterized in that, The diameter of the fiber is 200~500μm.

3. The method according to claim 1, characterized in that, The length of the fiber is 3~10cm.

4. The method according to claim 1, characterized in that, The fiber has a diameter of 200 μm and a length of 3 cm.

5. The method according to claim 1, characterized in that, The fiber has a diameter of 500 μm and a length of 10 cm.

6. The method according to claim 1, characterized in that, The fiber has a diameter of 300 μm and a length of 5 cm.

7. The method according to claim 1, characterized in that, The mass ratio of the phenolic resin visible light catalyst to the fiber is 1:0.1~0.

2.

8. The method according to claim 1, characterized in that, In step S1, during the anaerobic fermentation process of the microorganisms, the dissolved oxygen content in the wastewater is controlled to be no higher than 0.2 mg / L.

9. The method according to claim 1, characterized in that, In step S1, during the anaerobic fermentation process of the microorganisms, the dissolved oxygen content in the wastewater is controlled to be 0.1~0.2 mg / L.

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