CN110482645B - Sewage treatment method - Google Patents

Abstract

The invention discloses a sewage treatment method. A plasma power supply supplies power to a high-voltage electrode with a certain voltage, and an electric field is formed in the space between the high-voltage electrode and the ground electrode; the high-pressure gas in the high-pressure gas cylinder enters the electric field space through a gas flow control valve, The plasma jet is formed and sprayed; the liquid to be treated in the liquid reservoir is sprayed in the form of spray under the action of the liquid atomizer after passing through the liquid flow control valve, filter and flow meter; Detecting the target pollutant content: if the target pollutant content reaches the standard, keep the power supply voltage of the gas flow control valve and the high-voltage electrode unchanged; if the target pollutant content does not meet the standard, increase the opening of the gas flow control valve and the high-voltage electrode. Power supply voltage; under the action of the non-equilibrium plasma jet, the target purification substances such as viruses, bacteria and microorganisms contained in the droplet particles in the atomization field are killed to complete the purification process.

Description

A kind of sewage treatment method

technical field

The invention relates to a sewage treatment method, in particular to a sewage treatment method using non-equilibrium plasma technology.

Background technique

Compared with other existing water purification technologies, non-equilibrium plasma technology has the characteristics of high killing efficiency, low pathogen regeneration rate and low cost of use. It is a new high-efficiency and clean water purification technology. It involves many disciplines such as chemistry, physics, electricity, environmental protection, biology, etc. It can keep the reaction system at a low temperature, while saving energy and equipment investment, it also enables electrons to have high enough energy to excite, ionize, and dissociate reactant molecules. Thus, bacteria, pollutants, algae, etc. are degraded. It has great application potential in different wastewater purification fields such as domestic sewage, medical wastewater, industrial wastewater, and ship ballast water.

However, parameters such as the ionization space and the properties of the ionization medium have a great influence on the ionization effect of the non-equilibrium plasma discharge. Factors such as too large ionization space and too large medium density will cause the ionization effect to deteriorate sharply. When using non-equilibrium plasma technology to treat wastewater such as domestic sewage, medical wastewater, industrial wastewater, and ship ballast water, the liquid flow rate is too small due to the small size of the ionization space (that is, the pore size of the liquid flow channel), which may easily lead to excessive purification rate. Moreover, since the objects to be treated are all in liquid phase, it is easy to cause the failure of the non-equilibrium plasma discharge, resulting in the failure of purification; moreover, in the existing plasma water purification technology, the sewage flows through the plasma electrode space and is bound to come into contact with the electrode. This will cause corrosion and failure of the electrodes.

SUMMARY OF THE INVENTION

Aiming at the problems in the prior art that the purification rate is too slow, and the non-equilibrium plasma discharge failure and electrode corrosion are easily caused, the present application proposes a sewage treatment method.

In order to achieve the above purpose, the technical scheme of the present application is: a sewage treatment method, comprising the following steps:

S1: The plasma power supply supplies power to the high-voltage electrode with a certain voltage, and an electric field is formed in the space between the high-voltage electrode and the ground electrode;

S2: the valve opening electronic controller controls the gas flow control valve to open, and the high-pressure gas in the high-pressure gas cylinder enters the electric field space through the gas flow control valve, forming a plasma jet and ejecting;

S3: The valve opening electronic controller controls the opening of the liquid flow control valve, and the liquid to be treated in the liquid reservoir is sprayed in the form of a spray under the action of the liquid atomizer after passing through the liquid flow control valve, filter and flowmeter. And all the spray fields pass through the non-equilibrium plasma jet area;

S4: Detect the target purifier content in the purified liquid: if the target purifier content reaches the standard, keep the power supply voltage of the gas flow control valve and the high-voltage electrode unchanged; if the target purifier content does not meet the standard, increase the gas flow The opening of the control valve and the power supply voltage of the high voltage electrode;

S5: Then, the content of the target purified substance in the purified liquid is detected; if the content of the target purified substance has not yet reached the standard, repeat step S4; if it has reached the standard, then complete the entire working process;

S6: Under the action of the non-equilibrium plasma jet, the target purification substances such as viruses, bacteria, and microorganisms contained in the droplet particles in the atomization field are killed, and the purification process is completed.

The above method is implemented in a sewage treatment device, and the device includes: a liquid atomizer, an unbalanced plasma jet exciter, a flow meter, a filter, a liquid flow control valve, a gas flow control valve, a liquid reservoir, a high pressure Gas cylinder, valve opening electronic controller, plasma power supply; the liquid atomizer is connected to the liquid reservoir through a flow meter, a filter and a liquid flow control valve in turn, and the liquid flow control valve is also connected to the valve opening One end of the electronic controller, the other end of the valve opening electronic controller is connected with a gas flow control valve, the gas flow control valve is located on the pipeline between the high-pressure gas cylinder and the unbalanced plasma jet exciter, the The unbalanced plasma jet exciter is connected to the plasma power source, and the spray area at the bottom of the liquid atomizer overlaps with the jet area on one side of the unbalanced plasma jet exciter.

Further, there are multiple unbalanced plasma jet exciters, all of which are connected to the plasma power source.

Further, the liquid atomizer includes an atomizer body, the atomizer body is a hollow cylindrical structure, and an atomizing nozzle hole is arranged at the bottom of the hollow cylindrical structure.

Further, the atomizing nozzles are of a round and straight hole structure or a crossed round and straight hole structure or a crossed slot structure.

Further, the unbalanced plasma jet exciter includes a high voltage electrode, a ground electrode and an exciter body, the high voltage electrode is located in the exciter body, and a ground electrode is connected to the outer wall of the exciter.

Further, the high-voltage electrode is cylindrical or bar-shaped, and its material is tungsten, copper or stainless steel.

Further, the exciter body is made of polytetrafluoroethylene, glass, and ceramic insulating materials.

Further, the liquid storage tank is a water tank structure for storing the liquid to be purified.

Due to the adoption of the above technical solutions, the present invention can achieve the following technical effects: using the non-equilibrium plasma jet technology, the non-equilibrium plasma can be injected into the droplet particle atomization field. In this way, each droplet particle is surrounded by the non-equilibrium plasma jet, which greatly improves the purification efficiency. Since the length of the non-equilibrium plasma jet can be up to the order of 10 cm, a large-sized atomization space can be used, which greatly increases the liquid flow rate. The technical scheme using liquid atomization technology and non-equilibrium plasma jet technology can not only greatly improve the purification efficiency, but also greatly improve the purification flow.

Description of drawings

Figure 1 is a schematic structural diagram of a sewage treatment device;

Fig. 2 is the structural representation of liquid atomizer;

3 is a schematic diagram of a working state of a sewage treatment device;

Fig. 4 is the structural representation of embodiment 1;

Description of the serial numbers in the figure: 1 liquid atomizer, 2 unbalanced plasma jet exciter, 3 flowmeter, 4 filter, 5 liquid flow control valve, 6 gas flow control valve, 7 liquid reservoir, 8 high pressure gas cylinder, 9 valve opening electronic controller, 10 plasma power supply, 11 atomizer body, 12 atomization nozzle, 21 high voltage electrode, 22 ground electrode, 23 exciter body.

Detailed ways

The technical solutions in the implementation of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It can be understood that the described examples are only some examples of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

Example 1

This embodiment provides a sewage treatment device, including: a liquid atomizer, an unbalanced plasma jet exciter, a flow meter, a filter, a liquid flow control valve, a gas flow control valve, a liquid reservoir, a high-pressure gas cylinder, and a valve Opening electronic controller, plasma power supply; the liquid atomizer is connected to the liquid storage tank through a flow meter, a filter and a liquid flow control valve in turn, and the liquid flow control valve is also connected to the valve opening electronic controller. One end, the other end of the valve opening electronic controller is connected with the gas flow control valve, the gas flow control valve is located on the pipeline between the high-pressure gas cylinder and the unbalanced plasma jet exciter, the unbalanced plasma The jet exciter is connected to the plasma power source, and the jet region at the bottom of the liquid atomizer overlaps the jet region on one side of the unbalanced plasma jet exciter.

Preferably, as shown in FIG. 4 , the number of unbalanced plasma jet exciters in this embodiment is three.

The liquid atomizer 1 includes an atomizer body 11 and an atomizing nozzle hole 12 , the atomizer body 11 is a hollow cylinder structure, and the atomizing nozzle hole 12 can be a round straight hole structure, a cross round and straight hole Different structures such as hole structure, cross seam structure, etc. Liquid atomizers include atomizers, collision sleeves.

The unbalanced plasma jet exciter 2 includes a high-voltage electrode 21, a ground electrode 22, and an exciter body 23. The high-voltage electrode 21 can be of different structures such as cylindrical and bar-shaped, and its material can be tungsten, copper, stainless steel, etc. Different materials, the exciter body 23 is made of insulating materials such as polytetrafluoroethylene, glass, and ceramics.

The flow meter 3 is used to control the flow of the liquid to be purified. The filter 4 is used to filter impurities in the liquid 4 to be purified. The liquid flow control valve 5 and the gas flow control valve 6 are respectively used to control the liquid to be purified and the high-pressure gas. The liquid storage tank 7 is a water tank structure for storing the liquid to be purified. The high-pressure gas cylinder 8 is used to store high-pressure gas. The valve opening degree electronic controller 9 is used to control the opening degrees of the liquid flow control valve 5 and the gas flow control valve 6 . The plasma power supply 10 is used to supply power to the unbalanced plasma jet exciter 2, and can be a power supply structure such as a DC power supply, an AC power supply, and a radio frequency power supply.

Preferably, the positions of the high voltage electrode 21 and the ground electrode 22 are interchangeable.

Liquid atomization technology can convert a continuous liquid phase into a mixture of discrete droplet particles and air; moreover, the use of cross-hole and cross-slit spray hole structure can further reduce droplet particle size and increase droplet particle distribution scope.

Example 2

The present embodiment provides a sewage treatment method, comprising the following steps:

S1: The plasma power supply supplies power to the high-voltage electrode or the ground electrode with a certain voltage, and an electric field is formed in the space between the high-voltage electrode and the ground electrode;

S2: the valve opening electronic controller controls the gas flow control valve to open, and the high-pressure gas in the high-pressure gas cylinder enters the electric field space through the gas flow control valve, forming a plasma jet and ejecting;

S3: The valve opening electronic controller controls the opening of the liquid flow control valve, and the liquid to be treated in the liquid reservoir is sprayed in the form of a spray under the action of the liquid atomizer after passing through the liquid flow control valve, filter and flowmeter. And all the spray fields pass through the non-equilibrium plasma jet area;

S4: Detect the target purifier content in the purified liquid: if the target purifier content reaches the standard, keep the power supply voltage of the gas flow control valve and the high-voltage electrode unchanged; if the target purifier content does not meet the standard, increase the gas flow The opening of the control valve and the power supply voltage of the high voltage electrode;

S5: Then, the content of the target purified substance in the purified liquid is detected; if the content of the target purified substance has not yet reached the standard, repeat step S4; if it has reached the standard, then complete the entire working process;

S6: Under the action of the non-equilibrium plasma jet, the target purification substances such as viruses, bacteria, and microorganisms contained in the droplet particles in the atomization field are killed, and the purification process is completed.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. , these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (1)

1. a sewage treatment method, is characterized in that, comprises the steps: S1: The plasma power supply supplies power to the high-voltage electrode with a certain voltage, and an electric field is formed in the space between the high-voltage electrode and the ground electrode; S2: the valve opening electronic controller controls the gas flow control valve to open, and the high-pressure gas in the high-pressure gas cylinder enters the electric field space through the gas flow control valve, forming a plasma jet and ejecting; S3: The valve opening electronic controller controls the opening of the liquid flow control valve, and the liquid to be treated in the liquid reservoir is sprayed in the form of a spray under the action of the liquid atomizer after passing through the liquid flow control valve, filter and flowmeter. And all the spray fields pass through the non-equilibrium plasma jet area; S4: Detect the target purifier content in the purified liquid: if the target purifier content reaches the standard, keep the power supply voltage of the gas flow control valve and the high-voltage electrode unchanged; if the target purifier content does not meet the standard, increase the gas flow The opening of the control valve and the power supply voltage of the high voltage electrode; S5: Then, the content of the target purified substance in the purified liquid is detected; if the content of the target purified substance has not yet reached the standard, repeat step S4; if it has reached the standard, then complete the entire working process; S6: under the action of the non-equilibrium plasma jet, one or several target purification substances contained in the droplet particles in the atomization field are killed, and the purification process is completed; The above method is implemented in a sewage treatment device, and the device includes: a liquid atomizer, an unbalanced plasma jet exciter, a flow meter, a filter, a liquid flow control valve, a gas flow control valve, a liquid reservoir, a high pressure Gas cylinder, valve opening electronic controller, plasma power supply; the liquid atomizer is connected to the liquid reservoir through a flow meter, a filter and a liquid flow control valve in turn, and the liquid flow control valve is also connected to the valve opening One end of the electronic controller, the other end of the valve opening electronic controller is connected to a gas flow control valve, the gas flow control valve is located on the pipeline between the high-pressure gas cylinder and the unbalanced plasma jet exciter, the The unbalanced plasma jet exciter is connected to the plasma power source, and the spray area at the bottom of the liquid atomizer overlaps with the jet area on one side of the unbalanced plasma jet exciter; The liquid atomizer includes an atomizer body, the atomizer body is a hollow cylindrical structure, and an atomizing spray hole is arranged at the bottom of the hollow cylindrical structure; the atomizing spray hole is a round straight hole structure or a cross Round straight hole structure or cross seam structure; The unbalanced plasma jet exciter includes a high voltage electrode, a ground electrode and an exciter body, the high voltage electrode is located in the exciter body, and a ground electrode is connected to the outer wall of the exciter.

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