CN101781052A - Closed ultrasonic-vaporization high-voltage corona oxidation method and equipment thereof - Google Patents

Abstract

The invention relates to a wastewater oxidation method, in particular to a closed ultrasonic-vaporization high-voltage corona method, which belongs to the technical field of wastewater oxidation. According to the technical scheme of the invention, closed ultrasonic-vaporization high-voltage corona equipment comprises a liquid inlet pump and an ultrasonic vaporizer, wherein the liquid inlet pump is used for pumping wastewater samples; the liquid outlet end of the liquid inlet pump is connected with the ultrasonic vaporizer by a liquid inlet valve and a flow meter; the ultrasonic vaporizer is communicated with a high-voltage corona reaction chamber; a recycle pump is also arranged between the ultrasonic vaporizer and the high-voltage corona reaction chamber; the liquid outlet end of the recycle pump is connected with the ultrasonic vaporizer; and the ultrasonic vaporizer releases the oxidized and digested wastewater through a liquid outlet pump and a liquid outlet valve. The closed ultrasonic-vaporization high-voltage corona method has the advantages of convenient operation, simple equipment, simple technical process, low cost and high suitability.

Description

Sealed Ultrasonic Atomization High Voltage Corona Oxidation Method and Equipment

technical field

The invention relates to a wastewater oxidation method, in particular to a closed ultrasonic atomization high-voltage corona oxidation method and equipment thereof, belonging to the technical field of wastewater oxidation.

Background technique

At present, the following methods are mainly used for the detection of the content of nitrogen, phosphorus and other substances in wastewater: first, select some oxidation method to digest the organic matter, and oxidize the elements to be detected in various valence states in the wastewater into a unified highest valence form, and then For various element ions, use ultraviolet spectrophotometer or electrochemical sensor to detect the content of the substance to be tested.

Among them, the oxidation methods of the wastewater to be tested mainly include the following two methods:

1. Add oxidant method

The traditional wastewater oxidation method uses the method of adding some corresponding oxidant.

(1) Potassium persulfate method

For the determination of total nitrogen in wastewater, the national standard "Water Quality Determination of Total Nitrogen Alkaline Potassium Persulfate Digestion Ultraviolet Spectrophotometry" (GB 11894-89) stipulates that under the condition of alkaline medium at 120 ° C ~ 124 ° C, used Potassium sulfate as an oxidant can not only oxidize the ammonia nitrogen and nitrite nitrogen in the water sample to nitrate, but also oxidize most of the organic nitrogen compounds in the water sample to nitrate. This method needs to consume a large amount of potassium persulfate reagent, it is difficult to control the storage and use of the reagent, the operation is complicated, and the efficiency is low.

(2) Ozone oxidation method

Ozone is a strong oxidant with an oxidation potential of 2.07V and reacts quickly with organic matter. Ozone is mixed into water through aeration or jet flow, and can react with various forms of pollutants in water, transform complex organic matter into simple compounds, and gradually oxidize low-valence ions to high-valence forms. Usually the ozone produced by the ozone generator will be mixed with nitrogen oxides, which cannot be used for the detection of nitrogen in water quality. At the same time, the aeration and jet flow of ozone have high requirements on the pressure and flow rate of wastewater, which are difficult to apply to the on-site detection of a small amount of samples.

(3) hydrogen peroxide method

Hydrogen peroxide is a colorless viscous liquid. Its aqueous solution is commonly known as hydrogen peroxide. It is also a strong oxidizing agent commonly used in water treatment. The oxidation potential is 1.77V, which can oxidize inorganic and organic pollutants in water. The chemical properties of hydrogen peroxide are unstable, and it is generally stored in the form of 30% or 60% aqueous solution. The storage and use of hydrogen peroxide are not easy to control, and it is difficult to apply to on-site detection.

2. Electrolytic oxidation method

Wastewater electrolysis treatment is one of wastewater chemical treatment methods. The basic principle of electrolysis is applied to convert harmful substances in wastewater into harmless substances through electrolysis to achieve purification. Wastewater electrolysis treatment includes electrode surface electrochemical action, indirect oxidation and indirect reduction, and electrocoagulation processes, which remove pollutants in wastewater with different functions. The disadvantage is that the power consumption and electrode metal consumption are relatively large when treating a large amount of wastewater, and the separated sediment is not easy to process and utilize. At the same time, metal cation interference will be generated in the solution, which is not suitable for water quality detection.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a closed ultrasonic atomization high-voltage corona oxidation method and its equipment, which are easy to operate, simple in equipment, simplified in process flow, low in cost and good in applicability.

According to the technical solution provided by the present invention, the oxidation method includes the following steps: a. using a liquid inlet pump, a liquid inlet valve and a flow meter to pour 30ml to 60ml of wastewater water samples into the ultrasonic atomizer; b. turning on the ultrasonic wave Atomizer; the ultrasonic atomizer applies ultrasonic waves of 1.6MHz to 2.5MHz to the wastewater water sample, the wastewater water sample absorbs energy, the molecular kinetic energy increases, and the wastewater water sample is excited into a mist; c. Turn on the high-voltage corona reaction chamber and circulation pump; the wastewater mist in the ultrasonic atomizer enters the high-voltage corona reaction chamber under the action of the mist diffusion and circulation pump suction; the high-voltage corona reaction chamber applies 15000-30000V to the wastewater mist Under the action of voltage, the molecular chains and connecting bonds of the waste water mist are opened, and strong oxidizing free radicals are generated to oxidize and digest the waste water mist; Circulate in the corona reaction chamber for 3 to 6 minutes to fully oxidize and digest the waste water mist; e. Open the outlet pump and liquid outlet valve; through the outlet water pump and liquid outlet valve, release the wastewater in the ultrasonic atomizer and high-voltage corona reaction chamber mist to obtain the wastewater sample that has been oxidized and digested.

The airtight ultrasonic atomization high-voltage corona equipment used in the oxidation method includes a liquid inlet pump and an ultrasonic atomizer; the liquid inlet pump is used to extract waste water samples, and the liquid outlet end of the liquid inlet pump passes through the liquid inlet valve and The flow meter is connected with the ultrasonic atomizer; the ultrasonic atomizer is connected with the high-pressure corona reaction chamber, and a circulating pump is also arranged between the ultrasonic atomizer and the high-voltage corona reaction chamber, and the circulating pump The liquid outlet is connected to an ultrasonic nebulizer, and the ultrasonic nebulizer releases the oxidized and digested wastewater sample through a liquid outlet pump and a liquid outlet valve.

The ultrasonic atomizer communicates with the high-voltage corona reaction chamber through a glass tube. The ultrasonic frequency in the ultrasonic nebulizer is 1.6MHz-2.5MHz. The high-voltage corona reaction chamber includes a glass pipeline and a DC high-voltage package power supply. The end of the glass pipeline is provided with a groove, and stainless steel is placed in the groove, and the outside of the glass pipeline is wrapped with a copper wire mesh , the positive pole and the negative pole of the DC high voltage pack power supply are respectively connected with stainless steel and copper wire mesh.

The output voltage of the DC high voltage pack power supply is 15000-30000V.

The invention has the advantages of fast reaction speed and high reaction efficiency, and the atomized waste water sample can be rapidly oxidized under the action of high-voltage corona. The reaction process is carried out in a closed pipeline. There is no loss in the atomization process and the high-voltage corona process. At the same time, it will not be mixed with external impurity elements such as air, which is conducive to the accuracy of on-site water quality testing; no catalysts, oxidants and other chemicals are used. Reagents avoid the energy consumption and pollution problems in the process of using or producing these chemical reagents; the equipment using this oxidation method is small in size, easy to operate, and low in operating costs; auxiliary automatic control means can realize automatic sample injection and sample output, At the same time, there is no special requirement for the use environment, and it can be conveniently used for on-site testing of water quality.

Description of drawings

Fig. 1 is a structural block diagram of the present invention.

Fig. 2 is a schematic structural view of the high-voltage corona reaction chamber of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figure 1: the present invention includes liquid inlet pump 2, liquid inlet valve 3, flow meter 4, ultrasonic nebulizer 5, high pressure corona reaction chamber 6, circulation pump 7, liquid outlet pump 8 and liquid outlet valve 9 .

As shown in FIG. 1 , the liquid inlet pump 2 is used to extract a waste water sample 1 , and the waste water sample 1 drawn by the liquid inlet pump 2 enters the ultrasonic atomizer 5 through the liquid inlet valve 3 and the flow meter 4 . The waste water sample 1 entering the ultrasonic nebulizer 5, under the action of cavitation and excitation of 1.6MHz-2.5MHz ultrasonic waves, the molecular kinetic energy increases and becomes mist, and the waste water sample 1 absorbs the ultrasonic energy and becomes an activated excited state.

The ultrasonic atomizer 5 is connected to the high-voltage corona reaction chamber 6 through a glass pipeline, and the wastewater mist in the ultrasonic atomizer 5 enters the high-voltage corona by the diffusion of the wastewater mist and the suction of the circulation pump 7. In the reaction chamber 6 , the ultrasonic atomizer 5 and the waste water mist in the high-voltage corona reaction chamber 6 are circulated by the circulation pump 7 to ensure the full oxidation and digestion of the waste water sample 1 . After the wastewater sample 1 is fully oxidized and digested in the ultrasonic atomizer 5 and the high-voltage corona reaction chamber 6 , the oxidized wastewater sample 10 is released by the outlet pump 8 and the outlet valve 9 .

The ultrasonic nebulizer 5 is a commercially available medical ultrasonic nebulizer, and its main technical parameters are: rated voltage: 220V±10%; rated frequency: 50Hz; rated input power: <35w; ultrasonic frequency: 1.7MHZ; atomization volume: 4ml/min; mist particle diameter: 0.5-5μm. The ultrasonic atomizer 5 generates ultrasonic waves from the chip through the electronic oscillation circuit, and uses the cavitation and excitation of the ultrasonic waves to excite the wastewater water sample into a mist.

As shown in Figure 2: the high-voltage corona reaction chamber 6 includes the glass pipeline 15 and the DC high-voltage pack power supply 11; the end of the glass pipeline 15 is provided with a groove 13, and the groove 13 is placed with Stainless steel 12, the outside of the glass pipeline 15 is wrapped with a copper wire mesh 14, and the positive and negative terminals of the DC high voltage pack power supply 11 are connected to the stainless steel 12 and the copper wire mesh 14 respectively. The DC high-voltage pack power supply 11 uses stainless steel 12 as the positive pole, and copper wire mesh 14 as the negative pole of the power supply to perform high-voltage corona action on the waste water mist in the glass pipeline 15 .

The high-voltage corona reaction chamber 6 provides energy for the waste water mist, and the waste water mist absorbs the energy of the high-voltage electric field to open the molecular chains and linkages between organic matter and macromolecules, so that organic matter and macromolecules become small molecules, which is conducive to digestion and oxidation. Under the action of high-voltage corona, water molecules produce strong oxidizing hydroxyl radicals (OH). The electrochemical reaction formula of water molecules under the action of high-voltage corona is: H ₂ O*→·OH+·H; Wherein H ₂ O* is the excited state water molecule after absorbing the electric field energy.

Described oxidation method comprises the steps:

a. Using the liquid inlet pump 2, the liquid inlet valve 3 and the flow meter 4, pour 30ml to 60ml of waste water sample 1 into the ultrasonic atomizer 5;

b. Turn on the ultrasonic atomizer 5; the ultrasonic atomizer 5 applies ultrasonic waves of 1.6MHz to 2.5MHz to the wastewater sample 1, the wastewater sample 1 absorbs energy, the molecular kinetic energy increases, and the wastewater sample 1 is excited into a mist ;;

C, open high-voltage corona reaction chamber 6 and circulating pump 7; The waste water mist in the ultrasonic atomizer 5 enters in the high-voltage corona reaction chamber 6 under the effect of the diffusion of mist and the suction of circulating pump 7; The piezoelectric corona reaction chamber 6 applies a voltage of 15,000 to 30,000V to the waste water mist, opens the molecular chains and connecting bonds of the waste water mist, and generates strong oxidizing free radicals to oxidize and digest the waste water mist;

d. Using the suction effect of the circulation pump 7, the waste water mist is circulated in the ultrasonic atomizer 5 and the high-voltage corona reaction chamber 6 for 3 to 6 minutes, and the waste water mist is fully oxidized and digested;

e. Turn on the water outlet pump 8 and the liquid outlet valve 9; through the water outlet pump 8 and the liquid outlet valve 9, the waste water mist in the ultrasonic atomizer 5 and the high-pressure corona reaction chamber 6 is released to obtain the waste water 10 that has been oxidized and digested.

As shown in Figure 1 and Figure 2: after the wastewater water sample 1 enters the ultrasonic atomizer 5 and the high-voltage corona reaction chamber 6, it is oxidized and digested in a closed environment. There is no consumption during the piezoelectric corona process, and no impurity elements will be mixed in, which is conducive to the accuracy of on-site water quality testing. The whole process does not use chemical reagents such as catalysts and oxidants, which avoids consumption and pollution in the oxidation process. When the high-voltage corona action is carried out in the high-voltage corona reaction chamber 6, the positive and negative poles of the DC high-voltage pack power supply 11 are not in contact with the waste water mist, which avoids the interference of impurity elements. During the entire oxidation process, the reaction speed is fast, the reaction efficiency is high, and there is no special environmental requirement for the use of equipment, which is convenient for on-site detection of water quality.

Claims (6)

1. a closed ultrasonic-vaporization high-voltage corona oxidation method is characterized in that, described method for oxidation comprises the steps:

A, utilize liquid feeding pump (2), feed liquor valve (3) and under meter (4), in ultrasonic atomizer (5), pour into the waste water water sample (1) of 30ml～60ml;

B, unlatching ultrasonic atomizer (5); Described ultrasonic atomizer (5) applies the ultrasonic wave of 1.6MHz～2.5MHz to waste water water sample (1), and waste water water sample (1) absorbs energy, and molecular kinetic energy increases, and waste water water sample (1) is excited to vaporific;

C, unlatching high-voltage corona reaction chamber (6) and recycle pump (7); Waste water fog in the ultrasonic atomizer (5) under the effect of the diffusion of fog and recycle pump (7) suction, enters in the high-voltage corona reaction chamber (6); High-voltage corona reaction chamber (6) applies the voltage effect of 15000～30000V to waste water fog, opens the molecular chain and the connecting key of waste water fog, and produces the strong oxidizing property free radical, waste water fog is carried out oxidation clear up;

D, utilize the suction function of recycle pump (7), waste water fog was circulated 3～6 minutes in ultrasonic atomizer (5) and high-voltage corona reaction chamber (6), waste water fog is carried out abundant oxidation clear up;

E, open out water pump (8) and liquid-outlet valve (9); By going out water pump (8) and liquid-outlet valve (9), discharge ultrasonic atomizer (5) and the interior waste water fog of high-voltage corona reaction chamber (6), obtain oxidation and clear up the waste water water sample of finishing (10).

2. closed ultrasonic-vaporization high-voltage corona equipment that the described method for oxidation of claim 1 is used, comprise liquid feeding pump (2) and ultrasonic atomizer (5), it is characterized in that: described liquid feeding pump (2) is used to extract waste water water sample (1), and the outlet end of liquid feeding pump (2) links to each other with ultrasonic atomizer (5) by feed liquor valve (3) and under meter (4); Described ultrasonic atomizer (5) is connected with high-voltage corona reaction chamber (6), also be provided with recycle pump (7) between described ultrasonic atomizer (5) and high-voltage corona reaction chamber (6), the outlet end of described recycle pump (7) is connected with ultrasonic atomizer (5), the waste water water sample (10) after described ultrasonic atomizer (5) is cleared up by Pump for giving-out (8) and liquid-outlet valve (9) release oxidation.

3. closed ultrasonic-vaporization high-voltage corona equipment according to claim 2 is characterized in that: described ultrasonic atomizer (5) is connected by Glass tubing (16) with high-voltage corona reaction chamber (6).

4. closed ultrasonic-vaporization high-voltage corona equipment according to claim 2 is characterized in that: the ultrasonic frequency in the described ultrasonic atomizer is 1.6MHz～2.5MHz.

5. closed ultrasonic-vaporization high-voltage corona equipment according to claim 2, it is characterized in that: described high-voltage corona reaction chamber comprises glass piping (15) and high direct voltage bag power supply (11), the end of described glass piping (15) is provided with groove (13), be placed with stainless steel (12) in the groove (13), the external packets of described glass piping (15) is wrapped with copper wire gauze (14), and the positive pole of described high direct voltage bag power supply (11), negative pole end link to each other with stainless steel (12) and copper wire gauze (14) respectively.

6. closed ultrasonic-vaporization high-voltage corona equipment according to claim 5 is characterized in that: the output voltage of described high direct voltage bag power supply (11) is 15000～30000V.

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