CN1323950C - Pulse plasma gas-liquid discharge equipment for waste water treatment - Google Patents

Abstract

The invention relates to a pulse plasma gas-liquid discharge device for wastewater treatment, which comprises an insulating cylinder with a horizontal partition, the horizontal partition and the lower part of the cylinder form an aeration chamber, and a metal screw is screwed on the cover plate of the insulating cylinder, and the metal screw is A horizontal plate electrode is fixed at the end of the barrel, and aeration holes are evenly distributed on the horizontal partition. There are needle-shaped electrodes in the aeration holes. The needle-shaped electrodes either have axial through holes or have gaps with the aeration holes. The needle tip of the electrode is exposed above the horizontal partition and is parallel to the plate electrode, and the needle electrode and the plate electrode are connected to the output end of the pulse power supply. When treating wastewater, the aeration chamber aerates the wastewater in the insulating cylinder, and the gas-phase active particles generated by electrode discharge promote the diffusion of gas-phase active particles to the liquid phase, and cooperate with the active particles generated in the liquid phase to degrade organic pollutants. The device has the advantages of simple structure, convenient operation and low operation cost. It can be used for the treatment of refractory biodegradable and toxic and harmful industrial wastewater and the removal and purification of viruses and microorganisms.

Description

Pulse plasma gas-liquid discharge device for wastewater treatment

technical field

The invention relates to a device for discharging waste water in gas-liquid two-phase by using a pulse power supply, which belongs to the field of environmental technology and water treatment.

Background technique

In view of the large amount of industrial wastewater discharged in the current industrial production, it has various types, complex components, high concentration of chemical oxygen demand (COD), poor biodegradability, toxic and harmful characteristics, and it is difficult to effectively treat it with conventional physicochemical or biochemical treatment technologies. Control and Governance. Therefore, advanced oxidation technology has become a new technology and new method for the treatment of refractory biodegradable and toxic and harmful industrial wastewater.

Advanced oxidation technology uses various active free radicals to attack macromolecular organic matter (or microorganisms) in industrial wastewater, destroying its molecular structure (or cells), so that organic wastewater can be purified. However, due to the disadvantages of harsh reaction conditions, poor selectivity, and high cost, the advanced oxidation technology has certain limitations and scope of application in its further promotion. Recently, a new type of advanced oxidation technology, liquid-phase electric pulse technology, has attracted widespread attention due to the diversity of energy release in the electron transfer process of high-voltage pulse discharge and its application in environmental pollution control.

Hydroelectric pulse technology generally uses high-voltage pulse power to form plasma, which integrates advanced oxidation technologies such as high-energy electron radiation, wet oxidation, chemical oxidation, and photocatalytic oxidation. Adding technical means such as light source is a new concept of new wastewater treatment technology. The rising time of the high-voltage pulse discharge voltage in water is short (<100ns), and the pulse width is narrow (<200ns), so it can accelerate the electrons without accelerating the ions in the electric field, thereby forming high-energy free electrons without shielding. High-energy free electrons will promote the excited cracking or ionization of organic matter. This process has both physical and chemical effects. Physical effects can form ultraviolet light and shock waves, and their strength depends on the energy of the discharge; chemical effects mainly promote the formation of active substances, such as: OH·, O·, H ₂ O ₂ , O ₃ and other active free radicals, so the high-voltage pulse discharge treatment of wastewater can use the ultraviolet light, shock waves and active free radicals formed by the discharge to form a synergistic degradation of high-energy electrons, ultraviolet rays, ozone and other factors to enhance the treatment effect. New water treatment technology integrating light, electricity and chemical oxidation

Gas-phase high-voltage pulse discharge also generates plasma through gas-phase high-voltage discharge, thereby stimulating the generation of active particles and removing organic harmful and odorous waste gas. It has been widely used in industrial organic waste gas treatment processes. At present, the electrode structure of the commonly used high-voltage discharge plasma method water treatment reactor mainly includes point (needle)-plate, line-plate, line-cylinder structures under the liquid surface, but there are uneven mixing, dead angles, and active free radicals. The yield is not high, and the diffusion migration rate is low.

Contents of the invention

The purpose of the present invention is to provide a pulse plasma gas-liquid discharge device that uses submerged needle-point aeration to treat wastewater, using needle-point aeration to generate more active particles and enhance the activity under the condition of high-voltage pulse gas-liquid two-phase discharge Substances diffuse to the liquid phase mass transfer to achieve more efficient water sterilization and improve the removal efficiency of organic pollutants.

To achieve the above object, the present invention has the following two technical solutions.

plan 1

Pulse plasma gas-liquid discharge device for wastewater treatment, including an insulating cylinder with a horizontal partition, the horizontal partition and the lower part of the cylinder form an aeration chamber, a metal screw is screwed on the cover plate of the insulating cylinder, and one end of the metal screw Extending into the cylinder, the end is fixed with a horizontal plate electrode, and there are aeration holes evenly distributed on the horizontal partition. The needle tip of the electrode is in the same plane parallel to the horizontal plate electrode. The cylinder wall above the horizontal partition is provided with water inlet and outlet, and the cylinder wall below the horizontal partition is provided with an air inlet. The needle electrode and the plate electrode are respectively connected to the The two output terminals of the pulse power supply are connected.

Scenario 2

Pulse plasma gas-liquid discharge device for wastewater treatment, including an insulating cylinder with a horizontal partition, the horizontal partition and the lower part of the cylinder form an aeration chamber, a metal screw is screwed on the cover plate of the insulating cylinder, and one end of the metal screw Extending into the barrel, the end is fixed with a horizontal plate electrode, and evenly distributed on the horizontal separator, needle electrodes perpendicular to the separator are fixed. The needle tip of the needle electrode is in the same plane parallel to the horizontal plate electrode, and the needle electrode has Axial through holes connected to the aeration chamber, water inlet and outlet are provided on the cylinder wall above the horizontal partition, air inlet holes are provided on the cylinder wall below the horizontal partition, the needle electrode and the plate electrode are connected with the pulse power supply respectively. The two outputs are connected.

When treating wastewater, the aeration chamber exposes air to the wastewater in the insulating cylinder through the axial through hole of the needle electrode or through the gap between the needle electrode and the aeration hole. The gas-liquid mixed discharge form enables the active substances generated by gas-phase discharge to rapidly diffuse and transfer to the water body, and strongly mix with the submerged aerated water body to increase the yield of active substances and improve the treatment efficiency to a greater extent. At the same time, through The screw adjusts the distance between the plate electrode and the needle electrode, which can realize the discharge mode on the liquid surface or below the liquid surface, and there are different discharge forms, such as corona discharge, streamer discharge and spark discharge. Evenly distributed aeration is realized by uniformly distributing a considerable number of needle-shaped electrodes on the horizontal partition, which can effectively improve gas-liquid mass transfer and mixing, and improve the efficiency of wastewater treatment.

The device of the invention is simple in structure and easy to operate, can generate more active substances by utilizing useless air, and has low operating cost. The device of the invention improves the discharge intensity in a gas-liquid two-phase mixed discharge environment, thereby greatly improving the production efficiency of active substances in the water body and enhancing the water treatment effect. Enhancing the mass transfer and diffusion of gas-phase active substances to liquid phase plays a synergistic effect of gas-liquid mixed discharge. The device of the invention can be used for treating refractory biodegradable and toxic and harmful industrial waste water and removing and purifying viruses and microorganisms.

Description of drawings

Fig. 1 is the structural representation of the pulse plasma gas-liquid discharge water treatment device of scheme 1;

Fig. 2 is a schematic structural diagram of the pulse plasma gas-liquid discharge water treatment device of Scheme 2.

Detailed ways

Referring to Fig. 1, the pulse plasma gas-liquid discharge device for wastewater treatment includes an insulating cylinder 10 with a horizontal partition 14, the insulating cylinder can be an insulating plexiglass cylinder, and the horizontal partition 14 and the lower part of the cylinder form an aeration chamber 12. A metal screw 3 is screwed on the cover plate 11 of the insulating cylinder. One end of the metal screw 3 extends into the cylinder. The end is fixed with a horizontal plate electrode 4. The plate electrode can be a stainless steel circular plate, which is evenly distributed on the horizontal separator 14. There are aeration holes 13, usually the evenly distributed area corresponds to the plate electrode 4, and the solid needle electrodes 9 corresponding to the number of aeration holes pass through the aeration holes 13 and are fixed on the bottom of the insulating cylinder 10, and the needle electrodes 9 are connected to the aeration holes. There is a gap between the air holes 13, and the needle point of the needle electrode 9 is exposed above the horizontal partition 14, and is on the same plane, parallel to the horizontal plate electrode 4, and the cylinder wall above the horizontal partition 14 is provided with a water inlet 6 and The water outlet 7, the cylinder wall below the horizontal partition 14 are provided with an air inlet 8, the needle electrode 9 and the plate electrode 4 are respectively connected to the two output ends of the pulse power supply 1, 2 in the figure is the ground wire, and 5 is the connecting wire .

Referring to Fig. 2, the pulse plasma gas-liquid discharge device for wastewater treatment includes an insulating cylinder 10 with a horizontal partition 14, the horizontal partition 14 and the lower part of the cylinder form an aeration chamber 12, and on the cover plate 11 of the insulating cylinder A metal screw 3 is screwed, and one end of the metal screw 3 extends into the barrel, and the end is fixed with a horizontal plate electrode 4, and the needle-shaped electrodes 9 perpendicular to the separator 14 are evenly distributed on the horizontal separator 14, and the needle-shaped electrodes are usually 9. The evenly distributed area corresponds to the plate electrode 4. The needle tip of the needle electrode 9 is in the same plane and parallel to the horizontal plate electrode 4. The needle electrode 9 has an axial through hole 15 communicating with the aeration chamber 12. The cylinder wall above the plate 14 is provided with a water inlet 6 and a water outlet 7, and the cylinder wall below the horizontal partition 14 is provided with an air inlet 8, and the needle electrode 9 and the plate electrode 4 are respectively connected to the two output ends of the pulse power supply 1 , 2 in the figure is the ground wire, and 5 is the connecting wire.

The pulse power supply mentioned in the above two schemes is a 4-37 type high-power repetition frequency pulse power supply. The power supply parameters are: peak voltage 1-50KV, pulse rising edge 80-200ns, pulse repetition frequency 20-250Hz.

The following is the test comparison of adopting the device of the present invention to treat waste water, with p-chlorophenol, o-chlorophenol, methyl red and cationic red X-GRL as pollutants, power supply parameters: peak voltage (19.6KV), pulse front (about 100ns) , pulse frequency: (150Hz), the electrode spacing under the liquid is 2mm (needle electrodes and plate electrodes are both underwater), the electrode spacing above the liquid is 4mm (needle electrodes are under water, plate electrodes are above water), plate electrodes The distance from the liquid surface is 1mm. Under this condition, the removal efficiency can reach more than 95%, and the total energy consumption of the power supply is less than 20W, which is about 20% better than the treatment effect without aeration under the same conditions. When the same removal rate is reached, The required processing time is 10 minutes shorter, and the energy consumption is reduced by about 25%. The experimental conditions, test data and results are shown in Table 1.

Table 1 Pollutants discharge method Aeration volume (air) (L/h) Initial concentration (mg/L) time (min) Final concentration (mg/L) Removal rate (%) Power Consumption(W) p-Chlorophenol underwater 0100 100100 3030 36.12.5 63.997.58 18.512.6 liquid on 060 100100 3030 32.13.5 67.996.5 19.310.8 o-Chlorophenol underwater 0100 100100 3030 25.71.2 74.398.8 17.59.6 liquid on 0100 100100 3030 23.82.1 76.297.8 20.68.6 Methyl red underwater 060 5050 3030 12.32.3 75.495.4 16.58.7 liquid on 060 5050 3030 13.62.9 72.894.2 15.47.2 Cationic Red X-GRL underwater 015 5050 6060 12.11.3 75.897.4 17.312.1 liquid on 015 5050 6060 11.61.0 76.898.0 18.112.6

Claims (2)

1. The pulse plasma gas-liquid discharge device for wastewater treatment is characterized in that it comprises an insulating cylinder (10) with a horizontal partition (14), and the horizontal partition (14) and the lower part of the cylinder form an aeration chamber (12) , a metal screw (3) is screwed on the cover plate (11) of the insulating cylinder, and one end of the metal screw (3) extends into the cylinder, and this end is fixed with a horizontal plate electrode (4), which is evenly spaced on the horizontal separator (14). Aeration holes (13) are arranged on the cloth, and needle-shaped electrodes (9) fixed on the bottom of the insulating cylinder (10) pass through the aeration holes (13) and leave a gap with the aeration holes (13). The needle-shaped electrodes (9) ) in the same plane parallel to the horizontal plate electrode (4), the cylinder wall above the horizontal partition (14) is provided with a water inlet (6) and a water outlet (7), and the cylinder below the horizontal partition (14) The wall is provided with an air inlet (8), and the needle electrode (9) and the plate electrode (4) are respectively connected with two output terminals of the pulse power supply (1). 2. The pulse plasma gas-liquid discharge device for wastewater treatment is characterized in that it includes an insulating cylinder (10) with a horizontal partition (14), and the horizontal partition (14) and the lower part of the cylinder form an aeration chamber (12) , a metal screw (3) is screwed on the cover plate (11) of the insulating cylinder, and one end of the metal screw (3) extends into the cylinder, and this end is fixed with a horizontal plate electrode (4), which is evenly spaced on the horizontal separator (14). The needle electrode (9) perpendicular to the separator (14) is fixed on the cloth, the needle point of the needle electrode (9) is in the same plane parallel to the horizontal plate electrode (4), and the needle electrode (9) has a (12) Connected axial through holes (15), the cylinder wall above the horizontal partition (14) is provided with water inlet (6) and water outlet (7), and the cylinder wall below the horizontal partition (14) is provided with The air inlet (8), the needle electrode (9) and the plate electrode (4) are respectively connected with two output terminals of the pulse power supply (1).

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