CN102001724B - Circulating water treatment device and process using nanocrystalline titanium dioxide fiber photocatalysis reactor - Google Patents

Abstract

The invention discloses a circulating water treatment device and process for treating organic pollutant waste water, which is composed of a nanocrystalline titanium dioxide fiber photocatalytic reactor. Compared with the prior art, the present invention has innovations and obvious advantages in the structural design of the reactor: through the unique structure design of water inlet diameter expansion and deceleration, uniform flow distribution and overflow water outlet around the upper mouth of the inner cylinder, it can ensure a large While passing the water flow, it avoids the breakage and loss of fibers caused by too fast water flow rate; the ultraviolet lamp is placed at the axis of the reactor to maximize the use of ultraviolet light; fully consider the photocatalytic reaction while the waste water is treated Spray oxygenation; the invention has simple structure, convenient assembly and low cost; the formed photocatalytic circulating water treatment process has high efficiency and low energy consumption, and can carry out continuous water treatment with a relatively large flow rate, which has important practical value.

Description

Circulating water treatment device and process using nanocrystalline titanium dioxide fiber photocatalytic reactor

technical field

The invention belongs to the technical field of environmental protection, in particular to a circulating water treatment device and process using a nanocrystalline titanium dioxide fiber photocatalytic reactor. the

Background technique

Semiconductor photocatalytic oxidation technology can generate strong oxidizing free radicals under ultraviolet light irradiation, quickly and non-selectively oxidize and decompose various toxic organic pollutants in water, and can quickly kill bacteria and viruses in water without causing secondary pollution. Pollution, simple operation, low energy consumption, very broad application prospects in the field of water treatment. the

Among many semiconductor photocatalysts, titanium dioxide has attracted much attention due to its high photocatalytic activity, non-toxicity and harmlessness. However, the traditional application forms of titanium dioxide are mainly nano-powders, films and supports, all of which have insurmountable defects, such as the difficulty of separating and recycling nano-powders from water after reaction, and the low specific surface and activity of films and supports, which are easy to fall off, which greatly limits its use. practical application. The emergence of nanocrystalline titanium dioxide fibers is expected to solve the above problems. Due to the advantages of its fiber shape with a large aspect ratio, it is convenient to design a packed reactor, and water can flow directly through the fiber to undergo a photocatalytic reaction and then be separated directly; at the same time, because the fiber body is titanium dioxide nanocrystals and nanopores Coexisting polycrystalline structure, large specific surface area, high photocatalytic activity, and a three-dimensional distribution state of dispersion and interweaving in water, water and ultraviolet light pass through the gap to react, the contact area is large, and the photocatalytic efficiency is high, so it is expected to realize high-efficiency continuous The advanced water treatment process has important practical application value. Patents CN.200410024265.1 and CN.201010144227.5 have invented the preparation method of nanocrystalline titanium dioxide fiber, which solved the problem of the source of the material. the

In order to achieve efficient and continuous nanocrystalline titanium dioxide fiber photocatalytic water treatment, the main structure of the nanocrystalline titanium dioxide fiber photocatalytic reactor should be optimized first, and secondly, the reactor should be used to form a simple and effective water circulation process. the

When optimizing the main structure of the nanocrystalline titanium dioxide fiber photocatalytic reactor, the following issues need to be considered: ① How to reduce the water flow velocity in the contact range between water and fiber while ensuring a large amount of water to be treated, so as to avoid excessive water flow causing Fiber breakage and loss; ② How to maximize the use of ultraviolet light, reduce light loss, and achieve uniform irradiation of light in the reactor; ③ The reactor should be simple in structure, easy to manufacture and assemble, and low in cost. the

The prior art has not been able to completely and well solve the above problems, such as several types of titanium dioxide fiber photocatalytic reaction devices disclosed in patents CN. The problem of impacting fibers, especially at the water outlet, because the water outlet is directly set on the wall of the reactor, the cross-sectional area of the water flow is suddenly reduced, and the water flow speed is sharply accelerated at the water outlet, which is very easy to carry the fiber out of the water outlet; the ultraviolet light irradiation adopts optical fiber The transmission of ultraviolet rays from sunlight has the problems of large light transmission loss, uneven luminous points, and high cost, or the use of ultraviolet light sources to irradiate above the reactor, resulting in serious light waste; the overall structure of the reactor is complicated, fiber assembly is inconvenient, and the cost is high. advanced questions. In addition, _O2 must be involved in the photocatalytic reaction, and none of the above-mentioned patents considers this issue. In the prior art, titanium dioxide fiber photocatalytic reactors have not yet been used to form a complete water treatment process.

Contents of the invention

Aiming at the defects of the prior art, the present invention provides a nanocrystalline titanium dioxide fiber photocatalytic reactor with reasonable structure, convenient installation and low cost, and uses the reactor to form a complete set of circulating water treatment device and process, which can carry out comparative High-efficiency and continuous circulating water treatment operations with large flows. the

The technical solution to realize the object of the present invention is: a circulating water treatment device utilizing a nanocrystalline titanium dioxide fiber photocatalytic reactor consists of a nanocrystalline titanium dioxide fiber photocatalytic reactor, a water storage tank, a water pump, a first valve, a flow meter, a second The valve and the spray aerator head constitute a water circulation loop; among them, the water outlet of the storage tank is connected with the water inlet of the water pump, and the water outlet of the water pump is divided into two paths, one of which is connected with the first valve, and the other is connected with the second valve, and the first valve It is connected to the water inlet of the flowmeter, and the water outlet of the flowmeter is connected to the water inlet of the nanocrystalline titanium dioxide fiber photocatalytic reactor. The head is connected, and the spray aeration head is located above the water storage tank. Nanocrystalline titanium dioxide fiber photocatalytic reactor includes outer cylinder, inner cylinder, quartz tube, ultraviolet lamp, nanocrystalline titanium dioxide fiber, water inlet, porous distribution plate, water outlet, organic fiber cotton filter layer and quartz tube fixture; The cylinder, inner cylinder and quartz tube are arranged in concentric circles from the outside to the inside; the outer cylinder and the inner cylinder are placed vertically, and the upper openings of both are openings, and the height of the upper opening of the outer cylinder is higher than that of the inner cylinder. The height of the lower opening is also higher than that of the lower opening of the inner cylinder. The lower opening of the outer cylinder is provided with a water outlet pipe, and the bottom circumference of the annular gap between the outer cylinder and the inner cylinder is closed; The lower opening of the inner cylinder is connected, and a porous flow distribution plate is arranged at the junction, and a layer of organic fiber cotton filter layer is laid above the porous flow distribution plate; a quartz tube is arranged along the axial direction of the inner cylinder, and the lower opening of the quartz tube is closed. The bottom is in contact with the filter layer of organic fiber cotton, the upper opening of the quartz tube is a through opening, and the height of the upper opening of the quartz tube is higher than that of the upper opening of the outer cylinder; the quartz tube has a built-in ultraviolet lamp; the inner cylinder and the quartz tube are filled with nanocrystalline titanium dioxide fibers , and then lay a layer of organic fiber cotton filter layer at the water outlet position of the inner cylinder. The quartz tube is clamped and positioned by clamps, among which the first clamp - and the second clamp - at the lower and upper positions of the inner cylinder respectively clamp the quartz tube and fix it in the axial direction of the inner cylinder, and the one at the topmost position The third fixture-clamp the quartz tube and fix it with the upper circle of the outer cylinder with screws, so that the upper and lower positions of the quartz tube are fixed. the

The specific process is as follows: inject the waste water containing organic pollutants into the storage tank, turn on the water pump and the ultraviolet lamp, and the waste water will be pumped out from the left end of the storage tank through the water pump. After the flow is adjusted by a valve, it flows through the flowmeter, and flows into the inner cylinder of the nanocrystalline titanium dioxide fiber photocatalytic reactor through the conical water inlet with a diameter. As the diameter of the water inlet gradually expands, the cross-sectional area of the water flow increases accordingly, and the water flow speed is significantly increased. After being lowered, and then distributed evenly through the porous flow plate and organic fiber cotton filter layer, the water flow rises steadily and slowly, and flows through the gaps of nanocrystalline titanium dioxide fibers irradiated by ultraviolet lamps, where photocatalytic reactions occur on the surface of the fibers, reducing organic pollution in water. The substances are degraded and mineralized, the water flow rises to the top of the inner cylinder, and after being filtered by the organic fiber cotton filter layer, it overflows along the upper circle of the inner cylinder, flows to the bottom of the gap between the inner cylinder and the outer cylinder, and passes through the outlet pipe. The outlet flows out of the reactor, and finally flows back to the right end of the storage tank by itself; the right water pumped out by the pump passes through the second valve to control the flow, and then directly reaches the spray aerator head on the upper right of the water storage tank. The small hole jet is sprayed out for aeration and oxygenation, and the wastewater rich in dissolved oxygen is sprayed into the right end of the storage tank, and then flows to the left end and is pumped out by the water pump to form a cycle. the

Compared with the prior art, the present invention has significant advantages:

(1) Through the unique structural design of water inlet diameter expansion and deceleration, uniform flow distribution and overflow water outlet around the upper mouth of the inner cylinder, while ensuring a large water flow rate, it avoids fiber breakage and loss caused by too fast water flow. When the waste water enters the inner cylinder of the reactor through the conical inlet pipe with diameters, the cross-sectional area of the water flow is expanded dozens of times, which greatly slows down the flow rate of the water flow, and then the flow is evenly distributed through the porous flow distribution plate and the filter layer of organic fiber cotton to ensure the smooth rise of the water flow It is slow and will not cause scouring and damage to the titanium dioxide fibers; the outlet water of the reactor does not directly open an outlet on the wall of the reactor, but overflows along the upper circle of the inner cylinder of the reactor, which greatly increases the flow area of the outlet water and is designed There is an organic fiber cotton filter layer to filter and block to ensure that the fibers will not be lost with the water. If the outlet is directly opened on the wall of the vessel, the flow velocity at the orifice will increase sharply due to the sudden reduction of the cross-sectional area of the water flow, which will carry the fibers out of the reactor. the

(2) Maximize the use of ultraviolet light, almost no light loss. The ultraviolet lamp is placed at the axis of the reactor, and the emitted ultraviolet light is radiated out, which can be absorbed by the surrounding nanocrystalline titanium dioxide fibers layer by layer, with uniform illumination and high light utilization efficiency. the

(3) It is fully considered that the photocatalytic reaction is carried out while spraying and oxygenating the treated wastewater. When the photocatalytic oxidation reaction proceeds, the participation of O ₂ is extremely important. The oxygen adsorbed on the surface of the catalyst is the main capture agent of photogenerated electron e ^- and the effective acceptor of e ^- . The reduction reaction of oxygen and e ^- not only generates surface photocatalytic Hydroxyl radicals (·OH) required for the oxidation reaction, and provide the required OH ^- and H ₂ O for holes, and further generate ·OH, forming a benign surface photocatalytic process, reducing the surface electron-holes of semiconductor photocatalysts The right recombination rate greatly increases the reaction rate.

In the present invention, the pumped water is divided into two paths, one of which is sprayed, aerated and oxygenated, and the wastewater rich in dissolved oxygen is then subjected to photocatalytic reaction, so that the efficiency is greatly improved. the

(4) The nanocrystalline titanium dioxide fiber photocatalytic reactor of the present invention has simple structure, convenient assembly and low cost. the

(5) The nanocrystalline titanium dioxide fiber photocatalytic circulating water treatment process of the present invention has high photocatalytic efficiency and low energy consumption, and can carry out continuous water treatment with a large flow rate, and has important practical value. the

Description of drawings

Fig. 1 is a schematic flow diagram of a circulating water treatment device and process using a nanocrystalline titanium dioxide fiber photocatalytic reactor according to the present invention. the

Fig. 2 is a schematic cross-sectional view of the nanocrystalline titanium dioxide fiber photocatalytic reactor of the present invention. the

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing. the

In conjunction with Fig. 1, the present invention utilizes the circulating water treatment device of nanocrystalline titanium dioxide fiber photocatalytic reactor, consists of nanocrystalline titanium dioxide fiber photocatalytic reactor 1, water storage tank 2, water pump 3, first valve 4, flow meter 5, second The valve 6 and the spray aeration head 7 form a water circulation circuit; wherein, the water outlet of the water storage tank 2 is connected with the water inlet of the water pump 3, and the water outlet of the water pump 3 is divided into two routes, one of which is connected with the first valve 4, and the other is connected with the second valve 4. The valve 6 is connected, the first valve 4 is connected with the water inlet of the flow meter 5, the water outlet of the flow meter 5 is connected with the water inlet of the nanocrystalline titanium dioxide fiber photocatalytic reactor 1, and the water outlet of the nanocrystalline titanium dioxide fiber photocatalytic reactor 1 is connected to the Above the water storage tank 2, the second valve 6 is connected with the spray aeration head 7, and the spray aeration head 7 is located above the water storage tank 2. the

The nanocrystalline titanium dioxide fiber photocatalytic reactor 1 is composed of an outer cylinder 10, an inner cylinder 11, a quartz tube 12, an ultraviolet lamp 13, a nanocrystalline titanium dioxide fiber 14, a water inlet 15, a porous distribution plate 16, an outlet 17, organic fibers Cotton filter layer 18 and quartz tube clamp 19 constitute, and its specific structure is: outer tube 10, inner tube 11 and quartz tube 12 are arranged in concentric circles from outside to inside; Outer tube 10 and inner tube 11 are straight cylinders, Vertically placed, the upper openings of both are through openings, and the height of the upper opening of the outer cylinder 10 is higher than that of the upper opening of the inner cylinder 11, the height of the lower opening of the outer cylinder 10 is also higher than that of the lower opening of the inner cylinder 11, and the height of the lower opening of the outer cylinder 10 is higher than that of the inner cylinder 11. A water outlet pipe mouth 17 is provided, and the bottom circumference of the annular gap between the outer cylinder 10 and the inner cylinder 11 is closed; the water inlet pipe mouth 15 is in the shape of a cone whose diameter gradually expands, and is connected with the lower mouth of the inner cylinder [11]. There is a porous flow distribution plate 16, which is a circular flat plate evenly distributed with small holes of 1-3mm to achieve the effect of evenly distributing water flow, and a layer of organic fiber cotton filter layer 18-1 is laid on the top of the porous flow distribution plate 16 , play the role of filtering influent water and further evenly distributing the flow; a quartz tube 12 is arranged along the axial direction of the inner cylinder, the lower opening of the quartz tube 12 is closed, and the bottom of the quartz tube 12 is in contact with the organic fiber cotton filter layer 18-1, and the quartz tube 12 is in contact with the organic fiber cotton filter layer 18-1. The top of the tube 12 is a port, and the height of the top of the quartz tube 12 is higher than the height of the top of the outer cylinder 10; the quartz tube 12 is built with an ultraviolet lamp 13; 1 up to the area between the upper opening of the inner cylinder 11) to fill the nanocrystalline titanium dioxide fiber 14, and then lay a layer of organic fiber cotton filter layer 18-2 at the water outlet position of the upper opening of the inner cylinder 11 (i.e. the top of the nanocrystalline titanium dioxide fiber 14), Play the role of filtering out water and blocking the loss of nanocrystalline titanium dioxide fibers with water. the

The present invention utilizes the circulating water treatment process of the nanocrystalline titanium dioxide fiber photocatalytic reactor, and its specific process flow is: inject waste water containing organic pollutants (filtered in advance, without solid suspended matter) into the water storage tank 2, and turn on the water pump 3 and the ultraviolet lamp 13, the waste water is pumped out from the left end of the storage tank 2 through the water pump 3, and the pumped water is divided into left and right paths, wherein the water in the left path flows through the flow meter 5 after being adjusted by the first valve 4, and passes through the expanding cone Shaped water inlet pipe mouth 15 flows into the inner cylinder 11 of nanocrystalline titanium dioxide fiber photocatalytic reactor 1, because the diameter of water inlet pipe mouth 15 expands gradually, the water flow cross-sectional area expands correspondingly, and the water flow velocity significantly reduces, and then passes through porous flow distribution plate 16 and After the organic fiber cotton filter layer 18-1 is further evenly distributed, the water flow rises steadily and slowly, flows through the gaps of the nanocrystalline titanium dioxide fibers 14 irradiated by the ultraviolet lamp 13, and a photocatalytic reaction occurs on the surface of the fibers, and the organic pollutants in the water are degraded and eliminated. Mineralization, the water flow rises to the top of the inner cylinder 11, and after being filtered by the organic fiber cotton filter layer 18-2, it overflows along the upper circumference of the inner cylinder 11 and flows to the bottom of the gap between the inner cylinder 11 and the outer cylinder 10, It flows out of the reactor 1 through the outlet pipe 17, and finally flows back to the right end of the storage tank 2 by itself; the right-hand water pumped out by the water pump 3 is controlled by the second valve 6, and then directly reaches the spray aerator head 7 on the upper right of the storage tank 2 , sprayed from a plurality of small hole jets in the spray aerator head 7 to aerate and oxygenate, the wastewater rich in dissolved oxygen is sprayed into the right end of the storage tank 2, and then flows to the left end and is pumped out by the water pump 3 to form a cycle, which is constant After a period of time, the organic matter contained in the wastewater can be completely degraded until completely mineralized into CO ₂ and H ₂ O.

Principle of the present invention is as follows:

In the technological process of the present invention, when the waste water enters the inner cylinder of the reactor through the conical inlet pipe with diameters, the cross-sectional area of the water flow is enlarged dozens of times, so that the flow velocity of the water flow is greatly slowed down, and then the waste water passes through the porous distribution plate and the filter layer of organic fiber cotton. The flow distribution ensures that the water flow rises steadily and slowly, and will not cause scouring and damage to the titanium dioxide fibers; the water outlet of the reactor does not directly open an outlet on the wall, but overflows along the inner circle of the reactor inner cylinder, greatly increasing The water flow area is enlarged, and there is an organic fiber cotton filter layer to filter and block, so as to ensure that the fibers will not be lost with the water. If the outlet is directly opened on the wall of the vessel, the flow velocity at the orifice will increase sharply due to the sudden reduction of the cross-sectional area of the water flow, which will carry the fibers out of the reactor. the

The invention fully considers that the photocatalytic reaction is carried out, and the wastewater is sprayed and oxygenated. When the photocatalytic oxidation reaction proceeds, the participation of O ₂ is extremely important. The oxygen adsorbed on the surface of the catalyst is the main capture agent of photogenerated electron e ^- and the effective acceptor of e ^- . The reduction reaction of oxygen and e ^- not only generates surface photocatalytic Hydroxyl radicals (·OH) required for the oxidation reaction, and provide the required OH ^- and H ₂ O for holes, and further generate ·OH, forming a benign surface photocatalytic process, reducing the surface electron-holes of semiconductor photocatalysts The right recombination rate greatly increases the reaction rate. Its reaction mechanism is as follows:

O ₂ +TiO ₂ (e ^- )→TiO ₂ +·O ₂ ^-

·O ₂ ^- +2H ₂ O+TiO ₂ (e ^- )→TiO ₂ +H ₂ O ₂ +2OH ^-

H ₂ O ₂ +TiO ₂ (e ^- )→TiO ₂ +·OH+OH ^-

TiO ₂ (h ⁺ )+H ₂ O→TiO ₂ +H ⁺ + OH

TiO ₂ (h ⁺ )+OH ^- →TiO ₂ +·OH

The present invention will be further described below in conjunction with embodiment. the

The height of the outer cylinder of the reactor is 450mm, and the diameter is 150mm. The height of the inner cylinder is 400mm, and the diameter is 110mm. The water flow rate is 7L/min, and the rising speed of the water flow in the inner cylinder is about 2cm/min. It can recycle 500L of X-3B reactive brilliant red dye wastewater with a concentration of 20mg/L in one day, and the power consumption is only 1.32 kWh/day. the

Claims (5)

1. A circulating water treatment device using a nanocrystalline titanium dioxide fiber photocatalytic reactor, characterized in that: it consists of a nanocrystalline titanium dioxide fiber photocatalytic reactor [1], a water storage tank [2], a water pump [3], and a first valve [4], flow meter [5], second valve [6] and spray aerator head [7] form a water circulation circuit; wherein, the water outlet of the water storage tank [2] is connected with the water inlet of the water pump [3], and the water pump [3] ] The water outlet is divided into two routes, one of which is connected with the first valve [4], the other is connected with the second valve [6], the first valve [4] is connected with the water inlet of the flowmeter [5], and the flowmeter [5] ] The water outlet is connected to the water inlet of the nanocrystalline titanium dioxide fiber photocatalytic reactor [1]. The spray aeration head [7] is connected, and the spray aeration head [7] is located above the water storage tank [2]; the nanocrystalline titanium dioxide fiber photocatalytic reactor [1] includes an outer cylinder [10], an inner cylinder [11], Quartz tube[12], ultraviolet lamp[13], nanocrystalline titanium dioxide fiber[14], water inlet nozzle[15], porous distribution plate[16], outlet nozzle[17], organic fiber cotton filter layer[18] and quartz tube fixture [19]; outer cylinder [10], inner cylinder [11] and quartz tube [12] are arranged in concentric circles from outside to inside; outer cylinder [10] and inner cylinder [11] are placed vertically, two Both the upper openings are through openings, and the height of the upper opening of the outer cylinder [10] is higher than that of the upper opening of the inner cylinder [11], and the height of the lower opening of the outer cylinder [10] is also higher than that of the lower opening of the inner cylinder [11]. [10] The lower mouth is provided with a water outlet pipe mouth [17], and the bottom circumference of the annular gap between the outer cylinder [10] and the inner cylinder [11] is closed; the water inlet pipe mouth [15] is conical in diameter gradually expanding, and It is connected with the lower opening of the inner cylinder [11], and a porous flow distribution plate [16] is provided at the junction, and a layer of organic fiber cotton filter layer [18-1] is laid on the top of the porous flow distribution plate [16]; along the axial direction of the inner cylinder A quartz tube [12] is provided, the bottom of the quartz tube [12] is closed, the bottom of the quartz tube [12] is in contact with the organic fiber cotton filter layer [18-1], the upper port of the quartz tube [12] is a through port, and the quartz tube [12] [12] The height of the upper opening is higher than that of the outer cylinder [10]; the quartz tube [12] has a built-in ultraviolet lamp [13]; the inner cylinder [11] and the quartz tube [12] are filled with nanocrystalline titanium dioxide fibers [14] ], an organic fiber cotton filter layer [18-2] is laid on the water outlet position of the inner cylinder [11]. 2. The circulating water treatment device utilizing nanocrystalline titanium dioxide fiber photocatalytic reactor according to claim 1, characterized in that: the quartz tube [12] is clamped and positioned by a clamp [19], wherein it is located at the bottom of the inner cylinder [11] And the first clamp [19-1] and the second clamp [19-2] in the upper position respectively clamp the quartz tube [12] and fix it in the axial direction of the inner cylinder [11], and are at the topmost position The third clamp [19-3] clamps the quartz tube [12] and is fixed with the upper opening circle of the urceolus [10] with screws, so that the upper and lower positions of the quartz tube [12] are fixed. 3. The circulating water treatment device utilizing nanocrystalline titanium dioxide fiber photocatalytic reactor according to claim 1, characterized in that: the outer cylinder [10] and the inner cylinder [11] are straight cylinders. 4. the circulating water treatment device utilizing nanocrystalline titanium dioxide fiber photocatalytic reactor according to claim 1, characterized in that: the porous flow distribution plate [16] is a circular flat plate evenly distributed with 1-3mm apertures, reaching The effect of evenly distributing the water flow. 5. A circulating water treatment process using a nanocrystalline titanium dioxide fiber photocatalytic reactor, characterized in that: inject waste water containing organic pollutants into the storage tank [2], turn on the water pump [3] and the ultraviolet lamp [13] , the waste water is pumped out from the left end of the reservoir [2] through the water pump [3], and the pumped water is divided into left and right paths, in which the water in the left path flows through the flowmeter [5] after being adjusted by the first valve [4]. The diameter-expanding conical water inlet nozzle [15] flows into the inner cylinder [11] of the nanocrystalline titanium dioxide fiber photocatalytic reactor [1]. As the diameter of the water inlet nozzle gradually expands, the cross-sectional area of the water flow increases accordingly, and the water flow velocity decreases significantly. After the porous flow distribution plate [16] and the organic fiber cotton filter layer [18-1] further uniformly distribute the flow, the water flow rises steadily and slowly, and flows through the gap of the nanocrystalline titanium dioxide fiber [14] irradiated by the ultraviolet lamp [13]. , the photocatalytic reaction occurs on the surface of the fiber, the organic pollutants in the water are degraded and mineralized, the water flow rises above the inner cylinder [11], after being filtered by the organic fiber cotton filter layer [18-2], along the inner cylinder [11] The upper circle overflows down, flows to the bottom of the gap between the inner cylinder [11] and the outer cylinder [10], flows out of the reactor [1] through the outlet pipe [17], and finally flows back to the right end of the water storage tank [2] ; The right water pumped by the water pump [3] directly reaches the spray aerator head [7] on the top right of the water storage tank [2] after the flow is controlled by the second valve [6]. A plurality of small hole jets are ejected for aeration and oxygenation, and the wastewater rich in dissolved oxygen is sprayed into the right end of the storage tank [2], and then flows to the left end and is pumped out by the water pump [3] to form a cycle. the

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