CN104150704B - A kind for the treatment of unit of waste water treating and reutilizing and treatment process - Google Patents

Abstract

A treatment device for sewage treatment and reuse, which mainly includes: a grid pool connected to a baffled composite vertical constructed wetland through a water inlet pipe; The water outlet of the turbulent filtering device is connected with the nano-aeration advanced treatment device. The invention also discloses a treatment method for sewage treatment and reuse.

Description

A treatment device and treatment method for sewage treatment and reuse

technical field

The invention relates to a treatment device for sewage treatment and reuse.

The invention also relates to a method for advanced treatment of tertiary effluent of sewage by using the above-mentioned device.

Background technique

Sewage advanced treatment refers to the further water treatment process in which urban sewage or industrial wastewater is treated in the first and second stages, in order to achieve a certain reuse water standard so that the sewage can be reused as a water resource for production or life. For the raw water quality and treated water quality requirements of sewage (wastewater), a tertiary treatment or multi-level treatment process can be further adopted. It is often used to remove trace COD and BOD organic pollutants, SS, nitrogen and phosphorus high-concentration nutrients and salts in water. Advanced treatment methods include: flocculation sedimentation method, sand filtration method, activated carbon method, ozone oxidation method, membrane separation method, ion exchange method, electrolytic treatment, wet oxidation method, catalytic oxidation method, evaporation concentration method and other physical and chemical methods and biological desorption. Nitrogen, dephosphorization, etc. The advanced treatment method is expensive and the management is more complicated, and the cost per ton of water is about 4-5 times the cost of primary treatment. However, the cost of advanced treatment is high, and it is easy to cause waste and secondary pollution. Therefore, it is necessary to find a low-cost, more practical and effective method for advanced treatment of sewage.

Contents of the invention

The object of the present invention is to provide a treatment device for sewage treatment and reuse.

Another object of the present invention is to provide a method for advanced treatment of tertiary effluent of sewage by using the above-mentioned device.

In order to achieve the above object, the treatment device for sewage treatment and reuse provided by the present invention mainly includes:

A grid pool is connected to the baffle composite vertical artificial wetland through the water inlet pipe;

The baffle composite vertical constructed wetland is connected to the surface turbulence screening device through two constricted inlet pipes;

The water outlet of the surface turbulence screening device is connected with the nano-aeration advanced treatment device;

in:

The interior of the baffled composite vertical constructed wetland is divided into three parts by two partitions. The part connecting the grid pool is composed of a composite multi-functional packing layer and a gravel layer from top to bottom. The water inlet pipe of the grid pool is buried in the gravel layer; The part of the surface turbulence screening device is the sedimentation tank; the part between the composite multifunctional packing layer and the gravel layer and the sedimentation tank is the surface sand layer from top to bottom (red mud molecular sieve and sand are mixed according to the volume ratio of 3:2) And the gravel layer, below the gravel layer is an emptying pipe; horizontally staggered folded plates are arranged in the baffled composite vertical artificial wetland to prolong the hydraulic retention time of the sewage in the wetland; the supernatant of the sedimentation tank is introduced into the surface layer through a booster pump Turbulent flow screening device; the filler filled in the composite multifunctional filler layer is used to absorb a large amount of pollution load and gradually release it slowly to reduce pollution load and toxicity. At the same time, the surface sand layer uses alkaline red mud molecular sieve as filler, quickly Adsorb and neutralize the small molecular acids produced by anaerobic partial acidification, adjust the pH of the sewage, and make the environment in the device more suitable for the survival of plants and microorganisms; at the same time, create an alkaline environment to fix heavy metals in the sewage to prevent their leaching, and use small molecular organic matter to supply plants Nutrients, adsorb and absorb heavy metals during plant growth for heavy metal biostabilization. Biofilms are formed on the surface of all mixed fillers, and aerobic, anoxic, and anaerobic states are formed from top to bottom, and pollutants in sewage are removed under the synergy of plant roots and microorganisms;

The surface turbulence screening device is divided into upper and lower parts by a porous plate; the holes of the porous plate are inclined, and the sieve packing is laid on the top of the porous plate, and the bottom of the sieve packing is equipped with a nano aeration head, and the inner surface of the sieve packing There is a constricted inlet pipe opposite to each other on both sides, and the two constricted inlet pipes are connected with the booster pump of the baffled composite vertical constructed wetland; The backwashing pipeline is connected to the booster pump; the surface turbulence screening device is located above the backwashing pipe with a backflow tank; the aeration tube is installed on the side of the backwashing tank above the filter packing, and the aeration tube is equipped with multiple fine holes The aeration hole, the fine-pore aeration hole is vertically upward; an ultrasonic generator is installed above the filter packing; the water storage tank is below the porous plate, and a layer of non-metal doped photocatalyst is evenly loaded on the inner wall of the water storage tank, and an ultraviolet light is installed at the bottom of the water storage tank. Sterilization lamp, the nano-aeration head is set in the gap of the ultraviolet sterilization lamp, and the remaining space inside the surface turbulence screening device is filled with semiconductor-loaded fillers;

The water outlet of the water storage tank of the surface turbulence screening device is connected to the nano-aeration advanced treatment device through a booster pump; the bottom of the nano-aeration advanced treatment device is provided with a mud discharge port, and an inclined pipe packing layer is arranged inside above the mud discharge port. The inclined tube packing layer is equipped with a nano-aeration disc, and the top of the nano-aeration advanced treatment device is equipped with a motor that drives the gear to run through the belt, so that the scraper on the belt scrapes off the sludge and oil residue on the surface of the sewage treated by air flotation. Discharge in the slag collection tank; the slag collection tank is connected with the outlet pool composed of two folded plates, and after the upper scum and bottom sludge are isolated, the middle clear liquid is collected and discharged from the outlet.

In the treatment device for sewage treatment and reuse, the emptying pipe is a drilled PVC pipe.

In the treatment device for sewage treatment and reuse, the composite multifunctional filler layer is composed of Floris diatomite, gravel and fly ash molecular sieve, the particle size of Floris diatomite is 0.8-1.8mm, and the gravel particles The diameter is 20-50mm, and the particle size of fly ash molecular sieve is 10-50mm.

In the treatment device for sewage treatment and reuse, the filter filler is a mixture of natural quartz sand and modified manganese sand.

In the treatment device for sewage treatment and reuse, the semiconductor loaded filler is nano TiO ₂ powder loaded on the three-dimensional network polypropylene filler.

In the treatment device for sewage treatment and reuse, the aeration discs of the surface turbulence screening device and the nano-aeration advanced treatment device are respectively connected to a nano-aerator.

In the treatment device for sewage treatment and reuse, the air intake of the surface turbulence screening device is _O2 , which is used to clean the filler; the intake air of the nano-aeration advanced treatment device is _O3 , and a large amount of hydroxyl radicals are obtained through nano-aeration, A strong oxidizing effect.

The processing method of sewage treatment reuse provided by the invention, its process is:

The filter screen of the grid pool filters impurities in the water and enters the baffled composite vertical artificial wetland. The influent water flows through the gravel layer and the multifunctional packing layer, and after overflowing through the middle baffle, the sewage passes through the surface sand layer (red mud molecular sieve and sandy soil layer). Mix according to the volume ratio of 3:2), reach the gravel layer, settle and stand in the water outlet area, and extend the hydraulic retention time of sewage in the wetland by the folding plate set in the baffled composite vertical artificial wetland, and enhance the treatment effect of the system;

The supernatant in the effluent area of the baffled composite vertical constructed wetland is introduced into the surface turbulence screening device under the action of the booster pump;

The nano-aeration in the storage tank of the surface turbulence screening device is intermittently aerated. During aeration, the air pressure in the storage tank increases. Make it float, so that the sewage can pass through the filter packing smoothly; the air bubbles in the aeration pipe push the floating pollutants to the water surface, overflow to the return tank, mix with the influent water to adjust the influent water quality, and at the same time extend the sieving device Service life and backwash cycle;

The air intake of the nano-aeration head at the bottom of the sieve packing of the surface turbulence screening device is O ₂ , which is used to clean the packing; the air intake of the nano-aeration head in the lower water storage tank is O ₃ , and a large amount of hydroxyl radicals are obtained through nano-aeration. Together with ultraviolet sterilization lamps and semiconductor-loaded fillers, the advanced oxidation effect is improved. At the same time, the effluent rich in hydroxyl radicals flushes the sieve fillers when the device is backwashed, so that the sieve fillers are cleaned and regenerated; The final effluent enters the nano-aeration advanced treatment device, and the sewage is subjected to nano-aeration treatment under the condition of high-temperature nano-aeration to decompose the residual refractory organic compounds and remaining pathogenic bacteria and microorganisms, while removing organic matter and reducing COD. Clarity and color of sewage.

The effluent from the surface turbulence screening device flows back to the baffle composite vertical constructed wetland to adjust the water quality and stimulate the secretion of secondary substances during the growth of plants.

In the treatment method for sewage treatment and reuse, the average irradiation dose of the ultraviolet sterilizing lamp is above 300J/m ² .

The present invention combines the high degree of physical, chemical and biological methods to treat sewage, adopts the most advanced sewage treatment process to carry out sewage treatment and deep purification method for reclaimed water reuse, and fundamentally improves the technical principle to completely innovate the depth of sewage Treatment technology, simple process, less land occupation, good purification effect, thorough removal of organic matter, providing a better method for water resource conservation and reuse. Among them, the nano-titanium dioxide crystals in the surface turbulent sieving device are used as photocatalysts to excite highly oxidative free negative ions under the irradiation of ultraviolet lamps. At the same time, the energy excited during the nano-aeration process and the ultrasonic generation process can also occur and strengthen the production of free negative ions. Achieve photocatalytic effect; free negative ions and their vacancies after getting rid of the bondage of covalent bonds, and the charge on the surface of nanobubbles produce micro-electrolysis effect at the same time, which can kill Escherichia coli, Staphylococcus aureus, viruses, etc., and decompose Residual refractory organic compounds and toxic substances are used to disinfect and degrade sewage in a durable and safe manner. It has great advantages in the treatment of environmental hormones (such as hormone pesticides, antibiotics, dioxins, estrogens, and artificial synthetic hormones and other trace harmful chemicals), which can completely mineralize or decompose most of the organic matter. While the sewage is screened and treated, the effluent is purified and disinfected, and the effluent better meets the national requirements.

Description of drawings

Fig. 1 is a schematic diagram of a treatment device for sewage treatment and reuse in the present invention.

Explanation of main component symbols in the attached drawings:

1. Grid pool; 2. Wall; 3. Chrysanthemum; 4. Composite multifunctional filler layer; 5. Upward pool; Red mud molecular sieve and sand are mixed according to the volume ratio of 3:2); 11 sedimentation tank; 12 booster pump; 13 first valve; Backwash pipe; 18 second valve; 19 third valve; 20 nanometer aeration advanced treatment device; 21 gear; 22 scraper; 23 belt; 24 motor; Packing layer; 29 slag collection tank; 30 mud discharge hole; 31 nanometer aeration plate; 32 mud storage chamber; 33 nanometer aerator; 34 hydraulic pump; 35 fourth valve; 36 ultraviolet sterilization lamp; 37 porous plate; 38 Nano aeration head; 39 semiconductor loaded filler; 40 water storage tank; 41 emptying pipe; 42 gravel layer; 43 water inlet pipe; 44 ultrasonic generator; 45 aeration pipe;

detailed description

The object of the present invention is to provide a treatment method for sewage treatment and reuse, which can efficiently remove pollutants (such as organic matter, microorganisms, inorganic matter and other chemical impurities) in sewage.

Describe in detail below in conjunction with accompanying drawing. It should be noted that the left, right, up, down, etc. mentioned in the following descriptions are all based on the directions shown in the drawings.

Combined device provided by the invention, its main structure comprises:

A grid pool 1 is filtered by a filter, and impurities in the water gradually accumulate on the surface of the filter, and large particles are isolated from the sewage, reducing the risk factor of clogging of the constructed wetland and improving the efficiency of the downstream process.

The baffle composite vertical constructed wetland 6 is mainly divided into three parts. The left half is respectively a composite multifunctional packing layer 4 and a gravel layer 42 from top to bottom. The part from top to bottom is the surface sand layer (red mud molecular sieve and sand are mixed according to the volume ratio of 3:2) 10 and gravel layer 42, and reeds 8 are planted on the surface sand layer 10; the right half is the sedimentation tank 11. Below the gravel layer 42 is an emptying pipe 41, which is a drilled PVC pipe. The water inlet pipe 43 is buried in the gravel layer 42 on the left for water distribution, and the inlet water flows upward under pressure, flows through the gravel layer 42 and the composite multifunctional packing layer 4, overflows through the middle baffle A, and the sewage passes through the surface sand layer 10 reaches the gravel layer 42, and settles in the settling tank 11 and stands still. A large number of folded plates 7 are arranged in the baffled composite vertical constructed wetland 6 to prolong the hydraulic retention time of sewage in the wetland and enhance the treatment effect of the system. The supernatant of the sedimentation tank 11 is introduced into the surface turbulence screening device 16 under the action of the booster pump 12 .

The surface turbulence screening device 16 is divided into upper and lower parts by a perforated plate 37 . The hole of the porous plate 37 is inclined to the right, and a layer of sieve packing 15 is laid on the top of the porous plate 37. The sieve packing 15 is a mixture of quartz sand, modified manganese sand and natural zeolite molecular sieve, with a particle size of 0.5-2.0 mm. , adsorption, ion exchange, coagulation and removal of heavy metals as one of the multi-functional mixed filler. The bottom of the sieve packing 15 is provided with a nano-aeration head 38, and the opposite sides of the inner surface of the sieve packing 15 are respectively provided with a shrinkage inlet pipe 14, and the shrinkage inlet pipe 14 is connected with the booster pump of the baffle composite vertical constructed wetland 6 12 phase connections. One side of the surface turbulence screening device 16 is provided with a shrinkage backwash pipe 17, which is connected to the booster pump 12 through the backwash pipe. The surface turbulence screening device 16 is located above the shrinkage backwash pipe 17 and is provided with a backflow tank 46 . Above the sieve packing 15, an aeration tube 45 is arranged on one side of the reflux tank 46. The aeration tube 45 is provided with a plurality of fine-pore aeration holes, and the fine-pore aeration holes are vertically upward; above the sieve packing 15, an ultrasonic generator Instrument 44. Below the porous plate 37 is a water storage tank 40, the inner wall of the water storage tank 40 is evenly loaded with a layer of non-metallic doped photocatalyst, the bottom of the water storage tank 40 is installed with an ultraviolet sterilizing lamp 36, and a nano aeration head is arranged in the gap between the ultraviolet sterilizing lamp 36 38. The remaining space inside the surface turbulence screening device 16 is filled with semiconductor-loaded fillers 39 (such as nano- _TiO2 powder loaded on three-dimensional mesh polypropylene fillers). The present invention fixes the semiconductor-loaded fillers 39 on the carrier to solve the problem of conventional light Catalysts need the disadvantages of dispersants to be used together, which reduces the loss of catalysts and avoids the separation step of catalysts after the reaction.

The water outlet of the water storage tank 40 of the surface turbulence filtering device 16 is connected with the nano aeration advanced treatment device 20 through a booster pump 34 . A mud outlet 30 is provided at the bottom of the nano-aeration advanced treatment device 20, and an inclined pipe packing layer 28 is arranged above the mud outlet 30 inside. The inclined pipe packing layer 28 is provided with a nano-aeration disc 31. Under normal circumstances, nano-aeration treatment is performed on sewage to decompose residual refractory organic compounds and remaining pathogenic bacteria and microorganisms. While removing organic matter and reducing COD, the transparency and chroma of sewage are also improved. The top of the nano-aeration advanced treatment device 20 is equipped with a motor 24 to drive the gear 21 to run through the belt 23, so that the scraper 22 continuously scrapes off the sludge and oil residue on the surface of the sewage treated by air flotation to the slag collection tank 29 for discharge The slag collecting tank 29 is connected with the outlet pool 25 composed of two folded plates 27, and after the upper part of the scum and the bottom sludge are isolated, the middle clear liquid is collected and discharged by the water outlet 26.

When the surface turbulence screening device 16 performs screening, the nanometer aerator 33 in the water storage tank 40 aerates intermittently. The sieve packing laid on the top breaks up the pollutant layer on the surface of the sieve packing and makes it float, so that the sewage can pass through the sieve packing smoothly, and the air bubbles push the floating pollutants to the water surface and overflow to the right side. The reflux tank 46 is mixed with the incoming water to adjust the incoming water quality, and at the same time prolong the service life of the screening device and the backwashing cycle. For the case of low incoming water turbidity, it can even continuously purify the sewage without backwashing.

The surface turbulence screening device 16 screens the bottom of the nano-aeration head into O ₂ for cleaning the packing; the air intake of the nano-aeration head in the lower water storage tank is O ₃ , and a large amount of hydroxyl radicals are obtained through nano-aeration. Together with the ultraviolet sterilizing lamp and the semiconductor-loaded filler, the advanced oxidation effect is improved. At the same time, the effluent rich in hydroxyl radicals flushes the sieve filler when the device is backwashed, so that the filler is cleaned and regenerated better.

Use nano-aeration to improve the -OH production rate. Due to the large number of microbubbles, specific surface area, and slow rising speed, the gas-liquid contact area and contact time are greatly increased, which is conducive to the dissolution of ozone in water and overcomes the difficulty of ozone. The disadvantage of being soluble in water. The inside of the microbubbles has a large pressure and the interface disappears when the nanobubbles are broken. The chemical energy generated by the drastic changes in the surrounding environment promotes the generation of more hydroxyl radicals, which enhances the ability of ozone to oxidize and decompose organic matter.

Ozone produces OH under the irradiation of ultraviolet light. Ozone can take away the electrons in the photoinduced electron-hole pairs of titanium dioxide, thereby generating more hydroxyl radicals and accelerating the degradation of organic matter. Through the strong oxidation of OH Treat organic pollutants.

According to an embodiment of the present invention, the benzene series compounds in the sewage treated by the present invention are reduced by more than 95%, the turbidity of the sewage is reduced by 99%, and the effluent water quality has high transparency.

The backwashing pipe is installed at the right end of the water storage tank and connected to the backwashing pump. When the device is backwashing, the nano-aeration head starts to aerate, and the sand particles are treated with nano-aeration under the condition of high-temperature nano-aeration. Under the action of the shear force and the impact force generated during the aeration process, the impurities, colloids and biofilms that are intercepted by the packing are cleaned. At the same time, the water from the secondary nano-aeration advanced oxidation device is introduced through the backwash pump for backwashing. During the water filling process of the water storage tank, the air on the liquid surface is strongly squeezed and rises to the packing layer through the porous plate, so that the packing presents a boiling flow. state, after the air in the water storage tank is emptied, the water flow continues to flow upward at a high speed through the holes of the perforated plate, and at the same time, the water flow in the shrinking backwash pipe is flushed to the left during the entire backwashing process, and the filling of the entire device forms a rapid flow under the impact of the water flow. In the turbulent flow of operation, the fillers rub against each other in the small vortex formed under the action of forces in different directions, and the attached organic pollutants are removed, which is conducive to obtaining relatively pure fillers.

The present invention successively adopts three-stage backwashing technology to carry out backwashing:

The first level of backwash is an aeration cycle backwash. Due to the accumulation of pollutants on the surface of the filler, it is difficult for the sewage to penetrate through the gaps between the fillers. Backwashing is performed during the screening process, and the aeration pipe 45 is opened and the porous is intermittently opened. The nano-aerator 33 above the plate, the nano-aerator head in the sump works discontinuously, the air bulges upward from the porous plate, divides into small bubbles, and intermittently washes away the dense dirt layer on the sieve packing, and the pollutant layer is broken into Flake floating, under the synergy of the buoyancy of the aeration tube and the rightward thrust of the constriction tube when it enters the water, a pulsator effect is produced, and the flaky and dense pollutants on the surface of the filler overflow to the return tank, so that the pollutants retained by the filler are concentrated Except for the removal device, mixed with the influent for retreatment, the sewage can continue to permeate through the gap of the fly ash molecular sieve; the first-stage backwash can prolong the service life of the sieve filter device and the backwash cycle. For the case of low influent turbidity, Even without backwashing, the device can be continuously operated to purify sewage.

The second-stage backwash is an air pulse backwash. Due to the high turbidity of the sewage, a large amount of pollutants accumulate on the surface of the filler. The effect of continuous screening cannot be achieved only by the first-stage backwash step. Now close the first valve 13, the third valve 35, open the second valve 18, start the booster pump 12, the aeration pipe 45 and two nanometer aerators 33, and the nanometer aeration advanced treatment device 20 is discharged into the water in the pool 25. The effluent is introduced into the surface turbulence screening device 16 . Under the action of the return water pressure, all the air in the surface turbulent sieving device 16 is squeezed rapidly, the pores of the porous plate 37 rise, and the entire sieve packing layer is under the rising air, the rotation disturbance of the impeller and the sieve packing. Under the action of the impact force of the nano-aeration head, it rotates and flows, and the pollutants are broken and floated. Under the synergistic effect of the buoyancy of the aeration tube and the rightward thrust of the incoming water impact baffle, it overflows to the return tank and mixes with the initial incoming water. Wait for the water level to drop rapidly. After the filtration rate is stabilized again, close the booster pump 12, the nano aerator 33 under the perforated plate, and the second valve 18, open the first valve 13, and the third valve 35, and continue the screening process.

The third-stage backwashing is aeration turbulent backwashing. At this time, the first and second-stage backwashing are not enough to solve the problem of covering and blocking the filler by pollutants, and a large amount of sewage cannot be filtered. Now close the first valve 13, open the second valve 18, the third valve 35, start the booster pump 12, the aeration pipe 45 and two nanometer aerators 33, the ultrasonic generator 44, start the hydraulic pump 34 in reverse, and The effluent is directed into the sump. ⑴The air in the sump rises and stirs along the pores of the porous plate, the nano-aeration head at the bottom of the filler starts to aerate, and the turbine above the filler keeps rotating; In the state of turbulent flow and irregular high-speed movement, the fillers rub against each other under the impact of the vortex of the water flow and the shear force of the air bubbles, and the organic pollutants attached to the fillers can be removed to obtain relatively pure fillers; Ultrasonic waves are generated in the liquid medium, and cavitation effects are generated on the surface of the sieve packing. The shock wave formed when the cavitation bubbles burst during the closing process will generate thousands of air pressure impact pressures around it, acting on the surface of the packing to destroy the dirt. The viscosity between the materials, and make them quickly dispersed in the backwash solution, so as to achieve the effect of cleaning the surface of the packing. ⑷ After the air is exhausted, the effluent from the effluent tank continues to be introduced. Nano-aeration and ultrasonic waves can promote the generation of hydroxyl radicals. The effluent rich in hydroxyl radicals washes the surface and micropores of the filler particles in the turbulent state, and strips the pollutants and fillers. get regenerated. (5) The pollutants float upwards to the water surface continuously under the impact force of the water flow and the air flotation of the right aeration tube, and flow out from the left inlet weir and the right return trough to mix with the initial inlet water. After three-stage backwashing, the internal pollutants are cleaned and emptied.

Conventional sand filtration does not disturb the sand layer during the filtration process, allowing water to flow through the small gaps in the sand. Usually, the sand filtration process is improved by means of not disturbing the sand layer, compacting the filler, increasing the water pressure, and adding grids on the sand, so that the water flows through the small gaps in the sand, while the pollutants stay on the surface of the sand layer. The present invention utilizes the high-pressure water inlet of the constricted tube to disturb the surface layer of the filler, prevents the accumulation of pollutants from forming resistance to the smooth passage of the water flow, and uses advanced oxidation, ultrasonic waves, nano-aeration, impact force and shear force of air bubbles to improve the device. , use fly ash molecular sieve, manganese sand and other fillers to optimize the design, and finally use three-stage backwashing to improve the treatment process. The device has a good interception effect on suspended solids such as colloids, fibers, algae, etc. For water with low turbidity, the treatment process can be completed even without backwashing. At the same time, it can remove odors, kill bacteria, pathogenic bacteria, etc. The efficacy of a small amount of residual surfactants, polychlorinated biphenyls and other refractory organic compounds.

Carbon-doped nano _TiO of the present invention Preparation of powder:

Carbon-doped nano-TiO ₂ was prepared by a two-step process of uniform precipitation and hydrothermal method. With titanium sulfate and urea as the precursor, glucose as the carbon source, the specific preparation process is as follows: take 6.48g27 titanium sulfate and 3.24g54 urea (the molar ratio of titanium sulfate and urea is 1:2) dissolved in deionized water, and then add an appropriate amount of Glucose 0.6 was stirred evenly, and 1:2:0.023 was reacted at 90°C for 2 hours. After the reaction is finished, the reactant is taken out and dried, repeatedly washed with water until neutral, dried again, and ground with a ball mill to obtain carbon-doped nano TiO ₂ powder.

The method of loading nano TiO ₂ powder on the filler:

The three-dimensional network structure filler made of polypropylene is used to mix nano-TiO ₂ powder with deionized water (the mass ratio of powder to water is 1:20), and the emulsion is formed by ultrasonic wave, and the clean three-dimensional network The structural filler is immersed in a titanate coupling agent mixed with ethanol at a volume ratio of 1:1, stirred slowly for a period of time, then the filler is taken out and placed in the TiO ₂ emulsion to continue stirring for a period of time, and then placed in an oven to dry (85 ℃) 2h, that is, the polypropylene suspension filler loaded with nano TiO ₂ is prepared, its appearance is light yellow, and the film layer is relatively uniform.

Claims (10)

1. A treatment device for sewage treatment and reuse, which mainly includes: A grid pool is connected to the baffle composite vertical artificial wetland through the water inlet pipe; The baffle composite vertical constructed wetland is connected to the surface turbulence screening device through two constricted inlet pipes; The water outlet of the surface turbulence screening device is connected with the nano-aeration advanced treatment device; in: The interior of the baffled composite vertical constructed wetland is divided into three parts by two partitions. The part connecting the grid pool is composed of a composite multi-functional packing layer and a gravel layer from top to bottom. The water inlet pipe of the grid pool is buried in the gravel layer; The part of the surface turbulence screening device is a sedimentation tank; the part of the sedimentation tank is a surface sand layer and a gravel layer from top to bottom. It is an emptying pipe; the baffle composite vertical artificial wetland is equipped with horizontally staggered folded plates to prolong the hydraulic retention time of sewage in the wetland; the supernatant of the sedimentation tank is introduced into the surface turbulent screening device through a booster pump; The surface turbulence screening device is divided into upper and lower parts by a porous plate; the holes of the porous plate are inclined, and the sieve packing is laid on the top of the porous plate, and the bottom of the sieve packing is equipped with a nano aeration head, and the inner surface of the sieve packing There is a constricted inlet pipe opposite to each other on both sides, and the two constricted inlet pipes are connected with the booster pump of the baffled composite vertical constructed wetland; The backwash pipeline and the booster pump are connected to the effluent tank of the nano-aeration advanced treatment device; the surface turbulence screening device is located above the shrinking backwash pipe and is provided with a return tank; the filter packing is provided with an aeration tank on the side of the return tank The aeration tube and the aeration tube are equipped with a plurality of fine-pore aeration holes, and the fine-pore aeration holes are vertically upward; an ultrasonic generator is installed above the sieve packing; the water storage tank is below the porous plate, and a layer of non-metallic material is evenly loaded on the inner wall of the water storage tank. Doped with photocatalyst, an ultraviolet sterilizing lamp is installed at the bottom of the water storage tank, a nano-aeration head is installed in the gap of the ultraviolet sterilizing lamp, and the remaining space inside the surface turbulent filtering device is filled with semiconductor-loaded fillers; The water outlet of the water storage tank of the surface turbulence screening device is connected with the nano-aeration advanced treatment device through a hydraulic pump; the bottom of the nano-aeration advanced treatment device is provided with a mud discharge port, and an inclined pipe packing layer is arranged inside above the mud discharge port. The tube packing layer is equipped with a nano-aeration disc, and the top of the nano-aeration advanced treatment device is equipped with a motor that drives the gear to run through the belt, so that the scraper on the belt scrapes off the sludge and oil residue on the surface of the sewage treated by air flotation to the collector. The slag is discharged in the slag tank; the slag collecting tank is connected with the outlet pool composed of two folded plates, and after the upper scum and bottom sludge are isolated, the middle clear liquid is collected and discharged from the water outlet. 2. The treatment device for sewage treatment and reuse according to claim 1, wherein the emptying pipe is a drilled PVC pipe. 3. according to the described treatment device of sewage treatment reuse of claim 1, wherein, composite multifunctional packing layer is made up of flori diatomite, crushed stone and fly ash molecular sieve, flori diatomite particle diameter is 0.8 -1.8mm, the particle size of gravel is 20-50mm, and the particle size of fly ash molecular sieve is 10-50mm. 4. The treatment device for sewage treatment and reuse according to claim 1, wherein the sieve filler is mixed with quartz sand, modified manganese sand and natural zeolite molecular sieve according to the ratio of 5:2:1, wherein a small amount of zero Valence Nanoiron. 5. The treatment device for sewage treatment and reuse according to claim 1, wherein the semiconductor loaded filler is nano TiO ₂ powder loaded on the three-dimensional network polypropylene filler. 6. The treatment device for sewage treatment and reuse according to claim 1, wherein the nano aeration head of the surface turbulence screening device and the aeration disc of the nano aeration advanced treatment device are respectively connected to a nano aerator. 7. According to claim 1 or 6, the treatment device for sewage treatment and reuse, wherein the nano-aeration head intake at the bottom of the sieve packing of the surface turbulence screening device is O ₂ for cleaning the packing; nano-aeration advanced treatment The intake air of the device is O ₃ , and a large amount of hydroxyl radicals are obtained through nano-aeration, which plays a strong oxidation role. 8. Utilize the processing device of claim 1 for sewage treatment and reuse to carry out the treatment method for sewage treatment and reuse, the process is: The filter screen of the grid pool filters the impurities in the water and enters the baffled composite vertical artificial wetland. The influent water flows through the gravel layer and the composite multi-functional packing layer. After overflowing through the middle baffle, the sewage passes through the surface sand layer to the gravel layer. The sedimentation area is left to stand still, and the folding plate set in the baffled composite vertical constructed wetland prolongs the hydraulic retention time of the sewage in the wetland and enhances the treatment effect of the system; The supernatant in the effluent area of the baffled composite vertical constructed wetland is introduced into the surface turbulence screening device under the action of the booster pump; The nano-aeration in the storage tank of the surface turbulence screening device is intermittently aerated. During aeration, the air pressure in the storage tank increases. Make it float, so that the sewage can pass through the filter packing smoothly; the air bubbles in the aeration pipe push the floating pollutants to the water surface, overflow to the return tank, mix with the influent water to adjust the influent water quality, and at the same time extend the sieving device Service life and backwash cycle; The air intake of the nano-aeration head at the bottom of the sieve packing of the surface turbulence screening device is O ₂ , which is used to clean the packing; the air intake of the nano-aeration head in the lower water storage tank is O ₃ , and a large amount of hydroxyl radicals are obtained through nano-aeration. Together with ultraviolet sterilization lamps and semiconductor-loaded fillers, the advanced oxidation effect is improved. At the same time, the effluent rich in hydroxyl radicals flushes the sieve fillers when the device is backwashed, so that the sieve fillers are cleaned and regenerated; The final effluent enters the nano-aeration advanced treatment device, and the sewage is subjected to nano-aeration treatment under the condition of high-temperature nano-aeration to decompose the residual refractory organic compounds and remaining pathogenic bacteria and microorganisms, while removing organic matter and reducing COD. Clarity and color of sewage. 9. The treatment method for sewage treatment and reuse according to claim 8, wherein the average irradiation dose of the ultraviolet sterilizing lamp is more than 300J/m ² . 10. The treatment method for sewage treatment and reuse according to claim 8, wherein the effluent from the surface turbulent sieving device flows back into the baffled composite vertical constructed wetland to adjust water quality and stimulate the secretion of secondary substances during plant growth.