Sewage treatment equipment and sewage treatment method

Abstract

The present invention discloses a sewage treatment device and a sewage treatment method, the device comprises a box, a positive electrode insulating plate is arranged at the opening of the box, the positive electrode insulating plate is covered on the box to form a reaction chamber, a discharge device is arranged in the reaction chamber, the discharge device comprises a positive electrode sheet, a plurality of positive electrode posts, a steel wire mesh, and a negative electrode sheet from top to bottom, and a negative electrode insulating plate is arranged at the bottom of the discharge device. The sewage treatment method of the present invention adopts the above-mentioned sewage treatment equipment to treat sewage. The present invention is simple and efficient, has stronger oxidation capacity, and has a wider range of applications.

Description

[Technical field]

[0001] The present invention relates to the technical field of sewage treatment, and in particular to sewage treatment equipment and a sewage treatment method. [Background technology]

[0002] As the scale of sewage treatment in my country continues to expand, the demand for sewage treatment related equipment will also increase, and sewage treatment will be an indispensable part of future development. Therefore, the demand for sewage treatment equipment in my country will continue to increase and be long-lasting. Sewage treatment equipment has a broad space for development, and the localization of sewage treatment equipment has huge economic value and social significance.

[0003] In recent years, organic wastewater with high concentration of pollutants and stable structure has continued to appear. How to effectively remove these difficult-to-degrade organic wastewater has become a hot issue in sewage treatment. Hydroxyl free radicals have extremely high standard redox potentials and strong oxidizing ability. In theory, they can undergo rapid chain reactions with most organic pollutants.

[0004] There are many ways to treat sewage, which can generally be summarized as physical, chemical and biological methods. Among them, strong oxidation technology in chemical methods is increasingly used in the treatment of various sewage. However, due to the limitation of the oxidation capacity of strong oxidants, strong oxidation technology can only selectively degrade one or several types of pollutants in sewage.

[0005] Therefore, there is an urgent need to develop a sewage treatment technology that is simple, efficient, has stronger oxidation capacity and a wider range of applications. [Summary of the invention]

[0006] The main purpose of the present invention is to provide a sewage treatment device which is simple, efficient, has stronger oxidation capacity and a wider range of applications.

[0007] Another object of the present invention is to provide a sewage treatment method using a sewage treatment device which is simple, efficient, has stronger oxidation capacity and a wider range of applications.

[0008] In order to achieve the above-mentioned main purpose, a sewage treatment equipment provided by the present invention includes a box body, a positive electrode insulating plate is arranged at the opening of the box body, the positive electrode insulating plate covers the box body to form a reaction chamber, a discharge device is arranged in the reaction chamber, the discharge device includes a positive electrode sheet, a plurality of positive electrode posts, a steel wire mesh, and a negative electrode sheet from top to bottom, and a negative electrode insulating plate is arranged at the bottom of the discharge device.

[0009] A further solution is that a first bolt hole is opened in the non-peripheral area of ​​the positive insulating plate, and a second bolt hole is opened in the non-peripheral area of ​​the positive electrode sheet. A plurality of fastening screws are provided between the positive insulating plate and the positive electrode column, and the fastening screws pass through the first bolt hole and the second bolt hole in sequence to be fixedly connected to the positive electrode column.

[0010] A further solution is that a through hole is correspondingly opened in the non-peripheral area of ​​the negative electrode sheet, and the inner wall contour of the through hole is matched with the outer contour of the positive electrode column.

[0011] A further solution is that the box body and the positive electrode insulating plate are fixedly connected via guide pillars.

[0012] A further solution is that a water inlet pipe is provided on one side of the outer surface of the box body, and a drainage pipe is provided on the other side of the outer surface of the box body.

[0013] A further solution is that a water level control valve is provided on the water inlet pipe, and the water level control valve controls the opening / closing of the water inlet pipe, and a solenoid valve switch is provided on the drainage pipe, and the solenoid valve switch controls the opening / closing of the drainage pipe.

[0014] A further solution is that the positive electrode sheet is a positive conductive copper sheet, and the negative electrode sheet is a negative conductive copper sheet.

[0015] It can be seen that the sewage treatment equipment provided by the present invention is mainly composed of a positive insulating plate, a positive conductive copper sheet, a plurality of positive electric columns, a steel wire mesh, a negative conductive copper sheet, a negative insulating plate, etc. The discharge device undergoes an electrochemical reaction in the reaction chamber to decompose the pollutants in the sewage into carbon dioxide, water and water-insoluble intermediate products, which are then discharged through a drainage pipe and the sewage treatment process is completed after sedimentation and filtration.

[0016] Therefore, the present invention has the following characteristics: the conductive electrode is detachable, which is convenient for installation, maintenance and cleaning; the conductive copper sheet has a mesh structure, which increases the surface area of ​​the electrode, improves the mass migration coefficient of the liquid entering the device, stirs the sewage, and prevents the formation of deposited substances on the electrode; an insulating plate is provided, which has excellent insulation performance, good arc resistance and resistance to leakage traces, and good safety performance.

[0017] In addition, the plasma generated in the reaction chamber carries a large number of hydroxyl radicals and oxygen atoms. Due to the super strong oxidizing ability of hydroxyl radicals and the extremely strong oxidizing ability of oxygen atoms, its oxidizing ability is far stronger than the existing strong oxidation technology, and it can indiscriminately degrade various pollutants in sewage.

[0018] In order to achieve the above-mentioned other purpose, a sewage treatment method provided by the present invention comprises the following steps: the sewage in the sewage pool is controlled by a water level control valve of the sewage treatment equipment to be sent into the reaction chamber through a water inlet pipe, air and sewage are used as a gas-liquid mixture, and the gas of the gas-liquid mixture is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, and the plasma is fully in contact with the sewage to remove organic pollutants in the sewage, wherein the plasma carries a large number of hydroxyl free radicals and oxygen atoms with oxidation ability; the solenoid valve switch on the drainage pipe is started to discharge the purified water through the drainage pipe.

[0019] A further solution is that when the gas-liquid mixed liquid is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, the plasma also fully contacts with the organic pollutants in the sewage through the oxidizing nitrogen oxide free radicals and nitrite ions it carries to remove the organic pollutants in the sewage.

[0020] A further solution is that when the gas-liquid mixed liquid is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, during the plasma discharge process, the synergistic effect of ultraviolet light and hydrogen peroxide, the synergistic effect of ultraviolet light and ozone, and the combination of ferrous ions to generate ferric ions produce a Fenton reaction to remove difficult-to-degrade organic pollutants in sewage.

[0021] It can be seen that the plasma generated in the method of the present invention carries a large number of hydroxyl radicals and oxygen atoms. Due to the super strong oxidizing ability of hydroxyl radicals, oxygen atoms with extremely strong oxidizing ability, oxidizing nitrogen oxide radicals and nitrite ions, and Fenton reagent with strong oxidizing ability, its oxidizing ability is much stronger than the existing strong oxidation technology, and it can indiscriminately degrade various pollutants in sewage.

Brief Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a sewage treatment equipment of the present invention.

[0023] Figure 2 It is a three-dimensional exploded view of an embodiment of a sewage treatment equipment of the present invention. [Specific implementation method]

[0024] In order to make the purpose, technical solution and advantages of the invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention.

[0025] A sewage treatment equipment embodiment:

[0026] See also Figure 1 to Figure 2A sewage treatment device of the present invention includes a box body 100, a positive electrode insulating plate 1 is arranged at the opening of the box body 100, and the positive electrode insulating plate 1 is covered on the box body 100 to form a reaction chamber. A discharge device is arranged in the reaction chamber, and the discharge device includes a positive electrode sheet 2, a plurality of positive electrode posts 3, a steel wire mesh 4, and a negative electrode sheet 5 from top to bottom. A negative electrode insulating plate 6 is arranged at the bottom of the discharge device. Among them, the positive electrode sheet 2 is a positive electrode conductive copper sheet, and the negative electrode sheet 5 is a negative electrode conductive copper sheet; a plurality of positive electrode posts are more conducive to uniform discharge, and the steel wire mesh serves to prevent water surface splashing during discharge.

[0027] In this embodiment, a first bolt hole is correspondingly opened in the non-peripheral area of ​​the positive insulating plate 1, a second bolt hole is correspondingly opened in the non-peripheral area of ​​the positive plate 2, and a plurality of fastening screws 7 are arranged between the positive insulating plate 1 and the positive electrode column 3, and the fastening screws 7 pass through the first bolt hole and the second bolt hole in sequence and are fixedly connected to the positive electrode column 3. Among them, the sewage treatment equipment of this embodiment is a non-sealed design and can be in direct contact with the air.

[0028] In this embodiment, a through hole is correspondingly opened in the non-peripheral area of ​​the negative electrode sheet 5 , and the inner wall contour of the through hole is matched with the outer contour of the positive electrode column 3 .

[0029] The box body 100 and the positive electrode insulating plate 1 are fixedly connected via the guide pillar 8 .

[0030] In this embodiment, a water inlet pipe 9 is provided on one side of the outer surface of the box body 100 , and a drainage pipe 10 is provided on the other side of the outer surface of the box body 100 .

[0031] Among them, a water level control valve 11 is provided on the water inlet pipe 9, and the water level control valve 11 controls the opening / closing of the water inlet pipe 9. A solenoid valve switch 12 is provided on the drainage pipe 10, and the solenoid valve switch 12 controls the opening / closing of the drainage pipe 10.

[0032] It can be seen that the sewage treatment equipment provided by the present invention is mainly composed of a positive insulating plate 1, a positive conductive copper sheet, a plurality of positive electric columns 3, a steel wire mesh 4, a negative conductive copper sheet, a negative insulating plate 6, etc. The discharge device generates an electrochemical reaction in the reaction chamber to decompose the pollutants in the sewage into carbon dioxide, water and water-insoluble intermediate products, which are then discharged through a drainage pipe 10, and the sewage treatment process is completed after sedimentation and filtration.

[0033] Therefore, the present invention has the following characteristics: the conductive electrode is detachable, which is convenient for installation, maintenance and cleaning; the conductive copper sheet has a mesh structure, which increases the surface area of ​​the electrode, improves the mass migration coefficient of the liquid entering the device, stirs the sewage, and prevents the formation of deposited substances on the electrode; an insulating plate is provided, which has excellent insulation performance, good arc resistance and resistance to leakage traces, and good safety performance.

[0034] In addition, the plasma generated in the reaction chamber carries a large number of hydroxyl radicals and oxygen atoms. Due to the super strong oxidizing ability of hydroxyl radicals, the extremely strong oxidizing ability of oxygen atoms, the oxidizing nitrogen oxides and nitrite ions, and the Fenton reagent with strong oxidizing ability, its oxidizing ability is far stronger than the existing strong oxidation technology, and it can indiscriminately degrade various pollutants in sewage.

[0035] A sewage treatment method embodiment:

[0036] The sewage treatment method of this embodiment includes: the water level control valve 11 of the sewage treatment equipment controls the sewage in the sewage pool to be sent into the reaction chamber through the water inlet pipe 9, air and sewage are used as a gas-liquid mixture, and a high-frequency and high-voltage electric field is used by a discharge device to excite the gas of the gas-liquid mixture to generate plasma, and the plasma is fully in contact with the sewage to remove organic pollutants in the sewage, wherein the plasma carries a large number of hydroxyl free radicals and oxygen atoms with oxidation ability; the solenoid valve switch 12 on the drainage pipe 10 is started to discharge the purified water through the drainage pipe 10.

[0037] Furthermore, when the gas-liquid mixture is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, the plasma also fully contacts with the organic pollutants in the sewage through the oxidizing nitrogen oxide free radicals and nitrite ions it carries to remove the organic pollutants in the sewage.

[0038] Furthermore, when the gas-liquid mixture is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, during the plasma discharge process, the synergistic effect of ultraviolet light and hydrogen peroxide, the synergistic effect of ultraviolet light and ozone, and the combination of ferrous ions to generate ferric ions produce a Fenton reaction to remove difficult-to-degrade organic pollutants in sewage.

[0039] In practical applications, hydroxyl radicals in the process of plasma treatment of water: destroy CC bonds, form C-OH bonds, and destroy the structure of organic matter, so that the pollutant molecules are oxidized and degraded. The chemical reaction is:

[0040] H2O+e→·OH+·H+e (1)

[0041] H2O+e→2e+H2O + (2)

[0042] H2O + +H2O→·OH+H3O (3)

[0043] When oxygen is involved in plasma discharge, the dissociation of oxygen can form oxygen atoms, which can directly react with pollutant molecules for oxidation and promote the generation of hydroxyl radicals. The chemical reaction formula is:

[0044] ·O+H2O→2·OH (4)

[0045] Because hydroxyl radicals have a short life span, they will eventually generate hydrogen peroxide in water. The presence of hydrogen peroxide can generate more hydroxyl radicals in different ways or by reacting with other chemicals. For example, when plasma discharges in oxygen, ozone and hydrogen peroxide are produced. The chemical reaction formula is:

[0046] H2O2→H + +HO2 - (5)

[0047] O3+HO2 - → O2 - +·OH+O2 (6)

[0048] The plasma discharge is closely related to the gas composition. Different types of free radicals will be generated due to the different elements involved. The main elements in the air are N2 and O2. When the mixture of N2 and O2 is discharged to treat the aqueous solution, additional oxidizing nitrogen oxide free radicals and nitrite ions will be generated.

[0049] In addition, plasma discharge itself combines photocatalyst and electrochemical technology. During the discharge process, there will be a synergistic effect of ultraviolet light and hydrogen peroxide, and the synergistic effect of ultraviolet light and ozone will combine with a small amount of ferrous ions to generate ferric ions, resulting in a Fenton reaction.

[0050] Among them, the Fenton reaction is an inorganic chemical reaction, and its process is: a mixed solution of hydrogen peroxide (H2O2) and divalent iron ions Fe oxidizes many known organic compounds such as carboxylic acids, alcohols, and esters into inorganic states. The reaction has a high ability to remove difficult-to-degrade organic pollutants and is widely used in the treatment of wastewater such as printing and dyeing wastewater, oily wastewater, phenol-containing wastewater, coking wastewater, nitrobenzene-containing wastewater, and diphenylamine wastewater. Its chemical reaction formula is:

[0051] Fe 2+ +H2O2→Fe 3+ +(OH) - +OH· (7)

[0052] H2O2+Fe 3+ →Fe 2+ +O2+2H + (8)

[0053] O2+Fe 2+ →Fe 3+ +O2· (9)

[0054] From formula (7), we can see that 1 mol of H2O2 and 1 mol of Fe 2+ After the reaction, 1 mol of Fe is generated. 3+ , and 1 mol of OH is generated - Add 1 mol of hydroxyl radicals. It is the presence of hydroxyl radicals that makes Fenton's reagent have strong oxidizing ability. It is calculated that in a solution with pH = 4, the oxidation potential of OH radicals is as high as 2.73V. In nature, its oxidizing ability in solution is second only to fluorine gas.

[0055] It can be seen from equations (8) and (9) that in addition to producing 1 mole of OH· free radicals in the Fenton reagent, 1 mole of peroxyl free radicals O2· is also generated. However, the oxidation potential of peroxyl free radicals is only about 1.3 V. Therefore, the main oxidizing agent in the Fenton reagent is the OH· free radical (the potential of the OH· free radical reaches 2.73 V when pH = 4).

[0056] It can be seen that the plasma generated in the method of the present invention carries a large number of hydroxyl radicals and oxygen atoms. Due to the super strong oxidizing ability of hydroxyl radicals, oxygen atoms with extremely strong oxidizing ability, oxidizing nitrogen oxide radicals and nitrite ions, and Fenton reagent with strong oxidizing ability, its oxidizing ability is much stronger than the existing strong oxidation technology, and it can indiscriminately degrade various pollutants in sewage.

[0057] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto, and any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A sewage treatment device, comprising a housing, characterized in that: A positive electrode insulating plate is arranged at the opening of the box body, and the positive electrode insulating plate covers the box body to form a reaction chamber. A discharge device is arranged in the reaction chamber, and the discharge device includes a positive electrode sheet, a plurality of positive electrode posts, a steel wire mesh, and a negative electrode sheet in order from top to bottom. A negative electrode insulating plate is arranged at the bottom of the discharge device; A water inlet pipe is provided on one side of the outer surface of the box body, and a drainage pipe is provided on the other side of the outer surface of the box body; The water inlet pipe is provided with a water level control valve, and the water level control valve controls the opening / closing of the water inlet pipe. The drainage pipe is provided with a solenoid valve switch, and the solenoid valve switch controls the opening / closing of the drainage pipe. A first bolt hole is correspondingly opened in the non-peripheral area of ​​the positive electrode insulating plate, and a second bolt hole is correspondingly opened in the non-peripheral area of ​​the positive electrode sheet. A plurality of fastening screws are arranged between the positive electrode insulating plate and the positive electrode column, and the fastening screws pass through the first bolt hole and the second bolt hole in sequence to be fixedly connected to the positive electrode column; The positive electrode sheet is a positive electrode conductive copper sheet, and the negative electrode sheet is a negative electrode conductive copper sheet; The sewage treatment equipment is used for sewage treatment, including the following steps: The sewage in the sewage pool is controlled by the water level control valve of the sewage treatment equipment to be sent into the reaction chamber through the water inlet pipe. Air and sewage are used as gas-liquid mixed liquid. The gas of the gas-liquid mixed liquid is excited by the discharge device with a high-frequency and high-voltage electric field to generate plasma. The plasma is fully in contact with the sewage to remove organic pollutants in the sewage. The plasma carries a large number of hydroxyl free radicals and oxygen atoms with oxidation ability. The solenoid valve switch on the drainage pipe is started to discharge the purified water through the drainage pipe. When the gas-liquid mixed liquid is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, the plasma also fully contacts with organic pollutants in the sewage through the oxidizing nitrogen oxide free radicals and nitrite ions carried by the plasma to remove the organic pollutants in the sewage; When the gas-liquid mixed liquid is excited by a high-frequency and high-voltage electric field through a discharge device to generate plasma, during the plasma discharge process, the synergistic effect of ultraviolet light and hydrogen peroxide, the synergistic effect of ultraviolet light and ozone, and the combination of ferrous ions to generate ferric ions produce a Fenton reaction to remove difficult-to-degrade organic pollutants in sewage.

2. The sewage treatment equipment according to claim 1, characterized in that: A through hole is correspondingly opened in the non-peripheral area of ​​the negative electrode sheet, and the inner wall contour of the through hole is matched with the outer contour of the positive electrode column.

3. The sewage treatment equipment according to claim 1, characterized in that: The box body and the positive electrode insulating plate are fixedly connected via guide pillars.

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