WO2010060233A1

WO2010060233A1 - Sewage processing apparatus by means of microwave energy

Info

Publication number: WO2010060233A1
Application number: PCT/CN2008/001935
Authority: WO
Inventors: 祝光富; 杨刚毅
Original assignee: 广东上九生物降解塑料有限公司
Priority date: 2008-11-27
Filing date: 2008-11-27
Publication date: 2010-06-03

Abstract

A sewage processing apparatus by means of microwave energy, comprises a microwave resonant cavity (2). A processing core (1) is arranged in the cavity (2). A waveguide (3) connecting to a microwave source is set on one side of the cavity (2). Sewage enters into the processing core (1) through the inlet (6) of the cavity (2) and flows out from the outlet (5). The processing core (1) which the sewage running through is of a multilayer structure and each layer has at least one coaxial annular pipe. The pipes are connected in series to form a one-way passage.

Description

Device for treating sewage by using microwave energy

The invention relates to the technical field of sewage treatment equipment, in particular to an apparatus for treating sewage by using microwave energy. Background technique

With the strengthening of human social production and economic activities, the irrational development and utilization of human beings has led to the deterioration of environmental quality. Water pollution and deterioration of water quality have increased the global water shortage. In order to alleviate the deterioration of environmental quality and water stress, people have been working on the development of sewage treatment technology for a long time. Up to now, sewage treatment technology can be broadly divided into physical, chemical, physicochemical and biochemical methods. However, these treatment methods have certain limitations, and there are great defects in application conditions and treatment effects, such as the current market-dominant, technically mature sewage biochemical treatment methods (such as activated sludge method, oxidation ditch, etc.) It has the disadvantages of large land area, large investment, long construction period, poor adaptability of water quality and water fluctuation, high operation and management costs, and limited weather conditions. Seriously limit the development of sewage treatment. In response to this, a new type of sewage treatment technology, microwave wastewater treatment technology, has been proposed.

Microwave wastewater treatment technology has changed the traditional sewage treatment method, making the sewage treatment method simpler and more effective. The principle is briefly described as follows: The polar molecules in the sewage (including the majority of the water molecules in the sewage) produce intense orientation motion in the microwave electromagnetic field with alternating idling (such as the use of microwaves with a frequency of 2450 MHz, the orientation motion is 24 500 million times / sec. at high speed), each polar pollutant molecule, non-polar pollutant molecules in this violent large motion system are active or passive high-speed motion, more or less microwave It can be converted into the internal energy of the pollutant molecule, so that its activation energy is reduced and it actively participates in various physical and chemical reactions, so that the reaction which could not be carried out can be made, and the reaction which is slow in the original reaction becomes fast, and even the original Substances that do not have catalytic function become catalytic functions for certain reactions, etc., and can also change or destroy the spatial structure of bacteria and pathogens in sewage, denature proteins, thereby losing biological activity, and also changing their biological properties. Arrange the polymerization state and its motion law, and the ion current induced by the microwave field will affect the charge distribution near the cell membrane, resulting in the screen of the membrane. Damage to the function, affecting the function of the Na-K pump, causing membrane dysfunction, thereby interfering with or disrupting the normal metabolic function of the cell, resulting in inhibition, cessation or death of bacterial growth, and then ribonucleic acid (RNA) and deoxyribonucleic acid in the cell (DNA) can cause relaxation, fragmentation or recombination of bonds under the action of microwave field forces. Inducing gene mutations or chromosomal aberrations affects changes in their biological activity, delaying or disrupting the stable inheritance and proliferation of cells. Thereby the sewage is purified.

The solution, such as CN1231213A, CN101143737A, CN201033739Y, CN201024097Y, etc., published in Chinese patents has certain representativeness, but all have one thing in common, that is, "microwave sewage processor" is micro The indispensable equipment with common technical features of the wave sewage treatment system is the key to the microwave wastewater treatment system. The microwave sewage processor is composed of three parts: wave source (control system with adjustable output power), microwave resonator chamber and chopper sewage processor core.

Most of the patent documents are used to describe the microwave wave source (the control part with adjustable microwave power) and the standardized microwave short-distance transmission element (waveguide and flange), which are already very mature. In fact, this is mature. , the common technical characteristics, people just need to use it.

The CN1231213A document, which is representative in many patent documents, designs a cooling jacket outside the cavity of the sewage treatment professional industrial microwave oven, and cools the cavity by cooling water. This design may be suitable for fluid treatment other than sewage, but it is not necessary in microwave wastewater treatment because the purification of sewage in the microwave field is a microwave electromagnetic field in which high-frequency alternating polar molecules in the sewage are exchanged at high speed. In the intense orientation movement, the microwave energy is converted into the internal energy of the pollutant molecules in the sewage, so that its energy level is increased, and it is in an extremely unstable state and actively participates in various physical and chemical reactions to purify the sewage, instead of relying on Obtained by heating the sewage, the actual situation confirmed that a large amount of sewage (such as - when the treatment volume of 10 (k ³ ) through the 20kw microwave field, its temperature rise is minimal, there is no problem that the cavity needs to be cooled.

For example, in the CN1231213A document, a single spiral microwave sewage treatment processor core is wound by a flexible bellows, and the fixing problem is solved by means of plywood bundling and rope hanging. In the sewage treatment project, the large-flow, high-load sewage will surely destabilize and fall off when the treatment core of the structure flows, and the corrugated pipe itself has a thin wall and a rough inner wall, which seriously affects the safety of the sewage treatment process. .

Another example is CN101143737A, which discloses a vertically placed multi-layer spiral core whose sewage inlet and outlet are located at the lower part of the multi-layer spiral core. See Figure 2 of the document, when the sewage passes through the microwave field. Since various chemical reactions will occur in this process, gas will be generated. If the microwave sewage treatment processor core is the above-mentioned vertically placed multi-layer spiral core, the gas is lighter than the liquid, and the gas will definitely be in the multi-layer spiral core tube. The highest point, and will not flow freely with the sewage flow, will only form a gas block in the pipe and block the flow of the flow of the flow. When the gas in the gas block is continuously compressed, the pipe is also in danger of bursting.

Further, as stated in the invention of CN101143737A, "the technical problem to be solved by the present invention is to propose a microwave cavity capable of improving microwave penetration in sewage treatment". Actually, no matter what kind of microwave cavity is designed, it cannot be Improve the microwave penetration ability, because for a fixed medium (such as a kind of sewage), the penetration ability of the microwave is a certain value, it will not change, so the design of a better microwave resonant cavity guiding ideology It should be done in the direction of increasing the intensity of the microwave field in the unit volume and increasing the utilization of microwaves.

As described in CN201033739Y, many low-power magnetrons are used to achieve adjustable input power. As a sewage treatment, in general, its processing capacity is as small as several hundred tons per day and one million tons per day. If you pick The use of low-power magnetrons to regulate their output power is possible in the laboratory and is not desirable for larger wastewater treatment projects. According to market research, China's magnetron production status is: The frequency of 915MHz magnetron is only 20kw, the high-power tube is still in the development stage, the small power tube has not formed a series, the foreign has a large To lOOkw, but the price is very expensive, according to the consultation, the price of lOOkw magnetron made in Germany is 100,000 euros, which is very difficult to accept. The maximum power of the magnetron with a frequency of 2450MHz is 10kw, and the small power tube down has become a series of products, such as the lww of the household microwave oven. The magnetrons used in the wave source of the sewage treatment field generally use 915ffilz, 20kw and 2450MHz, 10kw, and the control system with continuously adjustable power has also been realized. Therefore, using a microwave wave source of lkw or several kw is too small for sewage treatment and is not applicable. Therefore, a microwave sewage treatment device of the present invention is designed based on two wave sources of 915 MHz - 20 kw and 2450 MHz - 10 kw.

It can be seen from the above background art literature that although there are many processors present, the theoretical basis of the design or the specific design schemes introduced are not satisfactory.

Summary of the invention:

The technical problem to be solved by the present invention is to overcome the shortcomings of some current design theories and the defects of specific products, and propose a microwave processing energy for treating wastewater by simply processing, low cost, increasing microwave field strength per unit volume and preventing microwave leakage. device.

In order to solve the above technical problem, the present invention adopts the following technical solution: The device includes a microwave resonant cavity, a processing core is disposed in the cavity, and a waveguide connected to the microwave source is disposed on one side of the cavity, and the sewage is The water inlet of the cavity enters the treatment core and flows out from the water outlet, wherein the treatment core through which the sewage flows is a unidirectional passage formed by connecting at least one coaxial toroidal pipe in the layer.

The cavity is a rectangular parallelepiped having a horizontal cross section, so that the incident and reflected paths of the microwave can pass mostly through the processing core located at the center of the cavity.

The inner wall of the cavity is made of stainless steel; the processing core is injection molded from polypropylene plastic.

A metal elbow is arranged at the water outlet and the water inlet of the cavity to form a metal water load at the water outlet and the water inlet, and a very small amount of microwaves carried by the sewage from the treatment core is completely consumed.

The upper and lower ends of the processing core are respectively provided with an outlet pipe and a water inlet pipe corresponding to the cavity water outlet and the water inlet.

The outlet pipe and the inlet pipe at the upper and lower ends of the processing core respectively have a sealing and shielding device, and the sealing and shielding device comprises: an internal thread gland with a flange and a mesh, a sealing ring and welding into and out of the cavity The externally threaded pipe at the nozzle, wherein the gland is screwed to the externally threaded pipe, the sealing ring is located at the end face of the inlet and outlet pipes, and is pressed under the screw connection of the gland and the externally threaded pipe. The processing core comprises: a circular multi-layer distributed circular-stage single-stage pipeline and a longitudinal connecting pipe connecting the single-stage pipelines layer by layer; each of the single-stage pipelines is provided with a partition.

Alternatively, the processing core comprises: a longitudinally multi-layered toroidal multi-stage pipe body and a longitudinal connecting pipe connecting the pipe body layer by layer; wherein each layer of the torus multi-stage pipe body comprises a multi-stage coaxial ring The body pipe is provided with a partition in each of the toroidal pipes, and the two adjacent toroidal pipes are connected by a transverse connecting pipe.

A support column is disposed between the single-stage pipes of the torus having a longitudinally multi-layer distributed in the treatment core.

A support column is disposed between the multi-stage pipe bodies of the torus having a longitudinally multi-layer distributed in the treatment core.

The invention adopts the above technical solution, and has the advantages of strong microwave field per unit volume, simple processing, firm and firm fixation, smooth gas discharge, low cost and the like compared with the current similar equipment. The sewage treatment system with the core composition of the invention has the advantages of high speed, high efficiency, small project area, small construction amount and low engineering cost.

DRAWINGS

Figure 1 is a perspective view of the present invention;

2 is a perspective view of a microwave sewage treatment core having a frequency of 2450 MHz and a power of 10 kw; FIG. 3 is an internal structural view of one of the annular unidirectional pipeline bodies in the processing core of FIG. 2;

4 is a perspective view of a second embodiment of the present invention: a microwave sewage treatment core having a frequency of 915 MHz and a power of 20 kw; and FIG. 5 is a structural view of the sealing and shielding assembly of the present invention.

detailed description

Referring to Figures 1, 2, and 3, the present invention comprises: a microwave resonant cavity 2 in which a processing core 1 is disposed in the cavity 2, and a cavity 3 connected to the microwave source is disposed on the side of the cavity. One side of the microwave cavity 2 is opened with a rectangular port corresponding to the standard waveguide, and the waveguide 3 is butt welded to the rectangular port, and the waveguide 3 and the cavity 2 are at an angle of 90 degrees with each other.

A circular hole is formed in the upper and lower sides of the cavity 2 as the water outlet 5 and the water inlet 6, and the position thereof is corresponding to the outlet pipe 15 and the inlet pipe 11 of the processing core 2, and the size is larger than the outlet pipe 15 of the processing core 2. The inlet pipe 11 has an outer diameter of 5 to 10 mm. The sewage enters the treatment core 1 from the water inlet 6 of the chamber 2 and flows out of the water outlet 5.

The cavity 2 is a rectangular parallelepiped having a square cross section and is welded by a SU304 stainless steel 2B plate having a thickness of 4 mm. The cavity 2 is designed as a rectangular parallelepiped in a horizontal section because: the metal reflects the microwave, and the waveguide 3 disposed perpendicularly to the cavity 2 vertically introduces the microwave into the rectangular cavity 2, so that the cavity can be disposed in the center of the cavity. The core is in an optimal microwave exposure state, and the horizontal cross section is square for the treatment of the cavity 2 and the cavity 2 The core 1 is optimally matched in space to avoid a reduction in the microwave volume per unit volume due to space waste of the cavity 2. The inner wall of the cavity 2 is made of stainless steel with high cost performance. There is not much requirement for the outer casing of the cavity 2 and the material of the main body bracket, and generally, a material having a certain strength, imperviousness, and easy processing can be used, for example, a common steel which is relatively inexpensive.

The internal dimensions of the microwave cavity 2 are related to the wavelength of the microwave used and the geometry of the processing core 1. In the case of avoiding the generation of standing waves, the present invention sets the internal geometry of the cavity 2 for microwaves of different frequencies as follows:

The internal geometry of the resonator using a 915MHz source is 1603 X 1603 X 1093mm.

The internal cavity of the resonator using a 2450MHz source is 1300 X 1300 X 928mm.

As shown in Fig. 2 and 4, the processing core 2 is formed by connecting a plurality of coaxial coaxial ring pipes in a plurality of layers in series. The processing core 2 of the present invention adopts different designs according to wave sources of different frequencies:

When using a 2450MHz wave source, the processing core is 5 layers, and each layer has 4 coaxial torus pipes, as shown in the first embodiment. When using a 915MHz wave source, the processing core is 2 layers, and each layer has a torus tube, see Example 2. The processing core 1 is formed by welding a thick 8 mm polypropylene sheet and a pipe, and the processing core 2 is formed by connecting a plurality of layers and a plurality of coaxial toroidal pipes in a layer in series. The inner dimension of the torus section is related to the penetration depth D _{E of the} used microwave to the sewage. The penetration depth D _E can be obtained by the following formula:

2n^s _r - tgS

Where λ. For the microwave wavelength of free space, ^ is the dielectric constant, and tg S is the dielectric loss.

The inner diameter of the torus of the treatment core 2 using the 2450 MHz wave source is 80 X 80 mm.

The inner diameter of the torus of the treatment core 2 using the 915 MHz wave source is 300 X 300 mm.

Referring to Figures 2 and 3, this is the first embodiment of the present invention. This embodiment is applicable to a microwave wave source having a frequency of 2450 MHz. In the present embodiment, the processing core 1 is formed by connecting five layers in a layer and four coaxial toroidal tubes in series. Specifically, the utility model comprises: a longitudinally distributed five-layer annular body multi-stage pipe body 12 and a longitudinal connecting pipe 14 connecting the multi-stage pipe body 12 layer by layer; wherein each pipe body 12 comprises four coaxial toroidal pipes 131, 132 , 133, 134. A partition plate 17 is disposed in each of the toroidal tubes 131, 132, 133, and 134, and two adjacent toroidal tubes are communicated through the transverse connecting tubes 16.

The working principle of this embodiment is as follows: The sewage is swirled inside the processing core 1 pipe, and the steam and liquid flow in the same direction. The height and width of each layer and each toroidal pipe cavity, the spacing between layers is 2450MHz. Two times the degree, about 2 X 40mm, so that the microwave in the reaction chamber 2 can be most effectively utilized regardless of the direction in which the microwave acts on the sewage. The sewage swirls in the toroidal pipe, which increases the residence time of the sewage, so that it can absorb microwave energy evenly and fully.

Referring to Fig. 3, the treated sewage enters the outermost toroidal tube 131 in the first layer of the toroidal multi-stage pipe body 12 of the treatment core 1 from the water tube 11 of the treatment core 1, and is partitioned by the partition 17 A circular circulation in the clockwise direction on the left side. On the right side of the intracavity partition 2, the sewage enters the second-stage annular body pipe 123 in the first layer from the transverse connecting pipe 16 between the ring and the ring, and a circular circulation in the counterclockwise direction is performed in the cavity; On the left side of the inner partition 2, the sewage enters the third-stage annular duct 133 from the transverse connecting pipe 16 between the ring and the ring, and makes a circular circulation in the clockwise direction in the cavity of the third-stage annular body pipe 133. . On the right side of the inner partition 2 of the chamber, the sewage enters the fourth-stage toroidal pipe 134 from the transverse connecting pipe 16 between the ring and the ring, and a circular circulation in the counterclockwise direction is made in the pipe cavity; On the left side of the inner partition 2, the sewage is plunged from the longitudinal connecting pipe 14 between the layers into the second layer of the toroidal multi-stage pipe body 12, with respect to the flow direction of the first layer, and the sewage is treated at the first of the processing core 1. The second layer will move in the opposite direction until it enters the third layer of the torus multi-stage pipe body, so that it flows until the sewage is discharged from the treatment core 1.

In order to ensure the stability between the torus multi-stage pipe body 12 between the layers, a support column is disposed between the torus multi-stage pipe bodies 12. The support column is also made of polypropylene. In addition, in order to facilitate positioning of the entire processing core 1 and the cavity 2, a polypropylene support column for fixing and positioning with the resonant cavity is disposed on the upper and lower end faces of the processing core 1.

Referring to Figure 4, this is a second embodiment of the present invention. This embodiment is matched with a microwave wave source image having a frequency of 915 MHz. The processing core 1 has 2 layers, and each layer has a toroidal tube. Specifically, the utility model comprises: a longitudinally two-layer distributed circular body single-stage pipe 18 and a longitudinal connecting pipe 14 which connects the single-stage pipe 18 layer by layer; a partition 17 is arranged inside each single-stage pipe 18, and the sewage is single in the single-stage pipe 18 To the swirl, the gas and liquid flow in the same direction. The height and width of each layer of toroidal pipe, the spacing between the layers is twice the penetration depth of the 915MHz microwave to the sewage, about 2 x 150mm, so that no matter which direction the microwave acts on the sewage, The microwave in the reaction chamber is most effectively utilized. The specific flow direction of the sewage can be referred to the above-mentioned first embodiment, and will not be described herein.

In order to ensure a firm connection between the pipes 18 and to ensure the structural stability of the entire process core 1, a support column is provided between the upper and lower end faces of the process core 1 and the pipe 18. The support column is made of polypropylene. As in the first embodiment, in order to facilitate positioning of the entire processing core 1 and the cavity 2, a polypropylene support column for positioning with the cavity is attached to the upper surface of the processing core 1.

In combination with the above two embodiments, the upper and lower ends of the processing core 1 are respectively provided with an outlet pipe 15 and an inlet pipe 11 corresponding to the water outlet 5 and the water inlet 6 of the cavity 2. The adoption of this structure takes into consideration that a certain amount of gas may be generated during the sewage treatment process, and the structure of the lower end water inlet and the upper end water outlet allows the gas and liquid to flow in the same direction, which is favorable for gas discharge. The sealing body and the shielding device 4 are arranged at the upper and lower outlets of the cavity and the water inlets 5 and 6. The sealing and shielding device 4 not only ensure the mutual communication between the sewage in the processing core 1 and the cavity 2, but also ensure the cavity. The regularity of the microwave field in the body 2 shields the leakage of the microwave well, and it is extremely easy to process and replace.

Further, in order to completely consume the extremely small amount of microwaves carried by the sewage from the treatment core 1, a metal water load is placed at the water outlet 5 and the water inlet 6. The above-mentioned water load for preventing microwave leakage is an elbow made of steel material outside the inlet and outlet of the sewage and having a length exceeding 2 to 3 times the depth of the microwave penetration.

The length of the water load to prevent microwave leakage when using a 915 MHz wave source is 450 mm.

The length of the water load to prevent microwave leakage when using a 2450 MHz wave source is 120 mm.

Specifically, the water load is a metal elbow 51 provided at the water outlet 5 of the cavity 2 and a metal elbow 61 provided at the water inlet 6.

As shown in FIG. 5, the outlet pipe 15 and the inlet pipe 11 of the upper and lower ends of the processing core 1 respectively have a sealing and shielding device 4, and the sealing and shielding device 4 comprises: an internal thread gland 41 with a flange and a mesh hole, a sealing ring 42 and an externally threaded pipe 43 welded to the inlet and outlet of the cavity 2, wherein the flanged gland 41 is screwed to the externally threaded pipe 43, and the sealing ring 42 is located at the end faces of the inlet and outlet pipes 11, 15. Moreover, the gland 41 is pressed against the externally threaded tube 43 by screwing, thereby ensuring that the sewage does not flow into the resonant cavity 2. The flanged gland 41 has a mesh 411 for discharging (or flowing in) the sewage, which can effectively reduce the leakage of the microwave and ensure the regularity of the microwave field in the cavity 2. Even with a small amount of microwave leakage, a small amount of microwaves discharged from the sewage are completely absorbed by the water through the water load placed on the inlet and outlet water pipes 11, 15.

In the case of the present invention, the sewage enters the pipe of the treatment core 1 through the water inlet 6 located below the cavity 2, and is continuously unidirectionally swirled upward. During the flow of sewage, under the action of the microwave magnetic field vertically introduced by the waveguide, various physical and chemical reactions occur actively, and various gaseous, solid and liquid substances generated flow out along with the sewage through the water outlet 5 and enter the subsequent processing equipment.

The invention has the advantages of: strong microwave field per unit volume, simple processing, firm and firm, smooth gas discharge and low cost. Can be widely used in the processing of various production and domestic sewage.

Claims

Rights request

1. A device for treating sewage by using microwave energy, the device comprising a microwave resonant cavity (2), and a processing core (1) disposed in the cavity (2), characterized in that: the cavity (2) - The side is provided with a waveguide (3) connected to the microwave source, and the sewage enters the treatment core (1) from the water inlet (6) of the cavity (2), and flows out from the water outlet (5), wherein the sewage flows through the treatment The core (1) is a unidirectional channel in which a plurality of layers and at least one coaxial ring body are connected in series.

2. Apparatus for treating sewage using microwave energy according to claim 1, wherein: said cavity (2) is a rectangular parallelepiped having a horizontal cross section.

3. The apparatus for treating sewage by using microwave energy according to claim 2, wherein: the inner wall of the cavity (2) is made of stainless steel; and the processing core (1) is injection molded of polypropylene plastic. Made.

4. The apparatus for treating sewage by using microwave energy according to claim 2, characterized in that - the chamber (2) at the water outlet (5) is provided with a metal elbow (51), a cavity (2) A metal elbow (61) is provided at the water inlet (6).

The apparatus for treating sewage by using microwave energy according to claim 1, wherein: the upper and lower ends of the processing core (1) are respectively provided with a water outlet (5) of the cavity (2) and The water outlet (15) and the inlet pipe (11) corresponding to the water inlet (6).

6. The apparatus for treating sewage by using microwave energy according to claim 5, wherein: the outlet pipe (15) and the inlet pipe (11) of the upper and lower ends of the treatment core (1) are respectively sealed, The shielding device (4), the sealing and shielding device (4) comprises: an internal thread gland (41) with a flange and a mesh, a sealing ring (42) and a welding at the inlet and outlet of the cavity (2) An externally threaded tube (43), wherein the gland (41) is threadedly connected to the externally threaded tube (43), the sealing ring (42) is located at the end faces of the inlet and outlet pipes (11, 15), and is located outside the gland (41) The threaded tube (43) is crimped under compression.

The apparatus for treating sewage by using microwave energy according to any one of claims 1 to 6, characterized in that: the processing core (1) comprises: a single-stage pipe of a circular body distributed in a longitudinal direction ( 18) and a longitudinal connecting pipe (14) which connects the single-stage pipes (18) layer by layer; a partition (17) is arranged in each single-stage pipe (18).

The apparatus for treating sewage by using microwave energy according to any one of claims 1 to 6, characterized in that: the processing core (1) comprises: a circular multi-layered pipe body with a longitudinally multi-layer distributed (12) and a longitudinal connecting pipe (14) connecting the pipe body (12) layer by layer; wherein each layer of the torus multi-stage pipe body (12) comprises The multi-stage coaxial toroidal pipe is provided with a partition (17) in each of the toroidal pipes, and the two adjacent toroidal pipes are connected by a transverse connecting pipe (16).

9. The apparatus for treating sewage by using microwave energy according to claim 7, characterized in that: the processing core (1) is provided with a longitudinally multi-layered circular body single-stage pipe (18) Support column.

10. The apparatus for treating sewage by using microwave energy according to claim 8, characterized in that - the processing core (1) is disposed between the longitudinally multi-layered toroidal multi-stage pipe body (12) There are support columns.