CN102139935A - Ultraviolet-photochemical compound water purifying process and device capable of realizing synchronous cleaning - Google Patents

Abstract

The invention relates to an ultraviolet-photochemical water purification treatment process and a reaction device which are economical, efficient and easy to operate and can be cleaned synchronously. The process includes the use of ultraviolet lamps with a main wavelength of 254nm and a secondary wavelength of 185nm (10-15%) to irradiate the air to generate ozone, form a gas-water mixture through a jet, strengthen the free radicalization of ozone through a high-intensity magnetic field, enter the reactor, and coordinate two stages A photochemical free radical chain reaction occurs at the wavelength of ultraviolet rays, and the tail ozone enters the water collection tank through the top duct using air pressure. The multi-stage treatment of ozone oxidation and ultraviolet/ozone photooxidation achieves the purpose of inactivating pathogenic bacteria and removing micro-pollutants; The water mixture enters through the tangent line at the bottom of the reactor, and the spiral rising air and water flow generated by the impact on the rotating blade cooperates with the three-dimensional cross-flow effect of the high-level perforated baffle to scour the surface of the casing, preventing biological and physical and chemical adhesion scaling. The inventive method and reaction device have good water purification and synchronous cleaning effects.

Description

A synchronous cleaning UV-photochemical composite water purification process and device

technical field

The invention relates to a process and device for highly efficient disinfection and removal of micro-pollutants. It uses single-stage multi-wavelength ultraviolet rays to irradiate air to generate ozone, and uses a magnetic field to strengthen ozone free radicalization and the multi-stage physical and chemical combination of ozone and multi-stage ultraviolet photochemistry. Photochemical action to achieve efficient disinfection and removal of micro-pollutants. Using tangential flow to drive the non-electric power rotating blades to generate spiral upward flow, and cooperate with the three-dimensional cross-flow effect of multi-layer perforated baffles to achieve the effect of mixing water and synchronously washing and cleaning the ultraviolet sleeve. The strong magnetic field magnetization treatment can also change the calcium The crystalline state of substances reduces the risk of scaling, and belongs to the technical field of drinking water treatment.

Background technique

At present, there are single-stage ultraviolet and two-stage ultraviolet-ozone joint effects in ultraviolet sterilization devices (first-stage 180-200nm ultraviolet ozone production and secondary 232-238nm ultraviolet/ozone combination), the latter has a certain degree of treatment effect compared with the former Improve the effect, but the ozone concentration may be too high to cause a strong odor in the effluent, and there is no tail gas reuse function, and the energy consumption of the secondary treatment will be too large; the existing automatic ultraviolet cleaning methods generally use mechanical cleaning, chemical cleaning and two The combined cleaning method is the main method, the structure is complicated, the manufacture and installation are inconvenient, and the energy consumption cost is high, and chemical substances will also be introduced, and the water treatment needs to be interrupted during cleaning. Therefore, there is a need for a process that can not only make full use of ultraviolet light and ozone, but also strengthen the free radicalization of ozone, and simultaneously have synchronous automatic cleaning, and a reaction device that does not require mechanical and chemical cleaning.

Contents of the invention

The invention provides an economical, efficient, and easy-to-operate drinking water synchronous cleaning and ultraviolet photochemical composite water purification process and device. The multi-stage effect of reaction and tail ozone self-circulation improves the disinfection effect, inhibits the photoreactivation of pathogenic bacteria and oxidizes and degrades micro-pollutants at the same time; integrates online cutting flow, spiral flow, three-dimensional cross-flow and magnetic field crystallization to realize synchronous cleaning and reduce the result. Integrated and enhanced treatment of scaling risks.

The structure of the reactor of the present invention is shown in Figures 1 and 2, comprising a first-stage water collecting tank ozone oxidation device (7) and a second-stage ultraviolet-ozone photochemical oxidation device (18). The first-stage reaction device is equipped with an aeration sand plate (8) and a gas-water mixture circulation conduit (19), and a flow meter (6) is connected to the front, and a lift pump (9) and a valve ( 10), jet (12), magnetization processor (13) and the lower water inlet are connected through pipelines, and valves (10) and (11) adjust and control the primary circulation and secondary treatment water volume; the secondary reaction device (18) Bottom helical blades (14), upper multiple sets of perforated baffles (15) and quartz casing (2) are housed inside, and a main wavelength 254nm, secondary wavelength 185nm low pressure ultraviolet lamp tube (3 ), air intake pipe and drier (1), main ozone air duct (4); final water outlet and water outlet regulating valve (16) are installed on the top of the second-stage reaction device, and sewage outlet and regulating valve (16) are equipped on the bottom 17).

Reactor system operating process of the present invention is as follows:

Open the valves 10, 11 and 16, turn on the power supply, and make the ultraviolet lamp 3 and the lifting pump 9 start to work. At this time, under the action of the ejector, the ozone-water mixture enters the ultraviolet reactor through the magnetic processor for disinfection and water purification treatment; the excess ozone-air mixed tail gas enters the water collection tank through the conduit 5 for diffusion and distribution. By adjusting the valves 10 and 11, the water treatment volume can be adjusted and controlled.

Technical principle of the present invention is:

The UV/ozone photochemical reaction can produce hydroxyl radicals OH and oxygen radicals O with strong oxidizing ability; the conversion of the singlet state of the free radical pair to the triplet state can prevent the recombination between the singlet states of the free radicals, plus The effect of the magnetic field can accelerate this conversion, thereby accelerating the rate of ozone itself and the reaction with UV to produce hydroxyl radicals OH, and strengthening the oxidation reaction of free radicals; the change of the helical flow state on the surface of the casing can reduce the adhesion of microorganisms and calcium and magnesium minerals and fouling risk, the gas-water mixture entering the reactor from the ejector enters along the tangent line at the bottom, and the mixture is driven to spiral upward through the tangential impact on the spiral blade. The high-level area of the reactor may become advection as the lateral kinetic energy of the flow state weakens. Staggered multi-layer perforated baffles (see accompanying drawings 1 and 2, baffles type A and type B are placed at intervals, and the holes of adjacent layers are misplaced), which can be along the direction from the surface of the casing to the surface of the reactor and perpendicular to this Combined with upward flow, the three-dimensional cross-flow generated can strengthen the scouring effect of the weakened spiral flow on the surface of the casing, and can accelerate the mixing of the inner and outer water layers, and strengthen the sterilizing effect of ultraviolet light on the unit water body.

The advantages of the present invention are as follows:

1 Adopt single-stage multi-wavelength ultraviolet light to realize ozone production and water purification at the same time; the generated ozone is mixed with the treated water into the reactor through the jet device, and the unused ozone enters the pre-water collection tank through the reactor residual pressure self-circulation, realizing single-stage The purpose of ozone production and double-stage ozonation;

2 Use high magnetic field to strengthen free radicalization in ozone water and ultraviolet/ozone free radicalization, strengthen free radical generation, multi-level free radicalization strengthen disinfection effect and oxidize and remove micro-pollutants;

3. Use the kinetic energy of the water-air-water mixture to drive the rotating blades to form a spiral water flow, and cooperate with the three-dimensional cross-flow of the multi-layer perforated baffles in the high-level area to achieve the cleaning purpose of synchronous flushing without residual chemical pollutants;

4. The magnetic field strengthens free radicalization and photocatalytic oxidation to improve the disinfection effect and effectively prevent the photoreactivation of pathogenic bacteria;

5. The system is simple in structure, small in floor area, can realize continuous and automatic operation, and is easy to operate and maintain.

Brief description of the drawings

Fig. 1 is the operation schematic diagram of technique and reaction device of the present invention

Fig. 2 is a schematic diagram of perforated baffles in the high position area of the reaction device of the present invention

(Wherein, 1 is the quartz casing wall, 2 is the stainless steel cylinder wall, and 3 is perforation)

Detailed ways

In the following processing system, the power of the ultraviolet lamp is 41W, the output power is 14W, the output wavelength is mainly 254nm, and the output rate of ultraviolet light with a wavelength of 185nm is 10-15%.

Example 1

Surface water often contains organic matter such as humus, which can absorb ultraviolet energy and reduce the effect of ultraviolet disinfection. Use tap water to prepare water to be treated containing Escherichia coli and humic acid, wherein the total number of Escherichia coli is 1.2×10 ⁶ CFU/L, and the humic acid is 2 mg/L. The air flow rate is 90L/h, the amount of ozone produced is 0.66mg/L (mixed gas), and the treatment effects on Escherichia coli and humic acid are shown in Table 1 when the treated water volume is 540L/h and 900L/min. It can be seen that the treated water volume increases by nearly doubled, the pathogenic bacteria inactivation rate and humic acid removal rate changed little.

Table 1 embodiment 1 processing effect

Example 2

The difference in the amount of air intake leads to the difference in the ozone production rate, the difference in the photooxidation efficiency leads to the difference in the sterilization efficiency, and the initial concentration of pathogenic bacteria also has a certain influence on the inactivation rate. Use tap water to prepare water to be treated containing Escherichia coli and humic acid, wherein the total number of Escherichia coli is 1.5×10 ⁶ CFU/L, and humic acid is 2 mg/L. The air flow rate is 120L/h, the ozone production is 0.82mg/L (mixed gas), and the treated water volume is 540L/h and 900L/min. The treatment effects on Escherichia coli and humic acid are shown in Table 2. The results showed that increasing the air intake increased the humic acid removal rate; the initial total number of pathogenic bacteria increased, but the inactivation rate was almost unaffected.

Table 2 embodiment 2 processing effect

Example 3

Due to the presence of particulate matter in surface water, water turbidity often affects UV penetration and disinfection effectiveness. Use tap water to prepare water to be treated containing Escherichia coli, wherein the total number of Escherichia coli is 9.3×10 ⁵ CFU/L, and use kaolin to adjust the turbidity of the water to 3NTU and 5NTU respectively. The air flow rate is 120L/h, the amount of ozone produced is 0.82mg/L (gas mixture), and the treated water volume is 540L/h. The inactivation effect on Escherichia coli is shown in Table 3. The results showed that common surface water turbidity had little influence on the bactericidal efficiency in this reaction system.

Table 3 embodiment 3 processing effect

Example 4

Due to the point source and non-point source pollution of pesticides, there are sometimes pesticide residues in surface water, which poses a threat to human health. Use tap water to prepare water for treatment containing atrazine and dimethoate. The air flow rate is 120L/h, the amount of ozone produced is 0.82mg/L (gas mixture), and the treated water volume is 300L/h. The removal effects of atrazine and dimethoate are shown in Table 4. The results show that pesticide micro-pollution can be efficiently removed in this reaction system.

Table 4 Example 4 treatment effect

Claims (7)

1. The present invention relates to a UV-photochemical water purification process and reaction device that is economical, efficient, and easy to operate and can be cleaned synchronously. The process includes the use of ultraviolet lamps with a main wavelength of 254nm and a secondary wavelength of 185nm (10-15%) to irradiate air to generate ozone, form a gas-water mixture through a jet device, and enter the reactor through a high-intensity magnetic field to strengthen ozone free radicals, and cooperate with two wavelengths The ultraviolet rays undergo a photochemical free radical chain reaction, and the tail ozone enters the water collection tank through the top conduit using air pressure, and the multi-stage treatment of ozone oxidation and ultraviolet/ozone photooxidation achieves the purpose of inactivating pathogenic bacteria and removing micro-pollutants; at the same time, the gas-water mixture Entering through the tangent line at the bottom of the reactor, the spiral rising gas-water flow generated by impacting the rotating blade cooperates with the three-dimensional cross-flow effect of the high-level perforated baffle to scour the surface of the casing, preventing biological and physical and chemical adhesion scaling. The inventive method and device have good water purification and synchronous cleaning effects. 2. according to the described method of claim 1, wherein, magnetization processor is high magnetic field processor, and its magnetic field strength is higher than 5000GS, is used for changing the crystalline structure of calcium salt and strengthening ozone free radicalization. 3. according to the described method of claim 1, wherein, ultraviolet lamp main wavelength is the high ozone low pressure ultraviolet lamp of 254nm, secondary wavelength 185nm (10-15%). 4. A UV-photochemical water purification device that can be cleaned synchronously is characterized in that it includes a first-stage water collecting tank ozone oxidation device (7) and a second-stage UV-ozone photochemical oxidation device (18), and the first-stage reaction The device is equipped with an aeration sand plate (8) and a gas-water mixture circulation conduit (19); a flow meter (6) is connected in front of the first-stage reaction device, and a lift pump (9), The valve (10), jet (12), magnetization processor (13) and the lower water inlet are connected by pipelines, and the valves (10) and (11) adjust and control the first-stage circulation and the second-stage treatment water volume; the second-stage The reaction device (18) is equipped with a bottom helical blade (14), multiple sets of perforated baffles (15) and a quartz casing (2), and a low-voltage ultraviolet lamp with a main wavelength of 254nm and a secondary wavelength of 185nm is installed in the quartz casing ( 3), air inlet pipe and dryer (1), main ozone air duct (4); the final water outlet and water outlet regulating valve (16) are installed on the upper part of the second-stage reaction device, and the sewage outlet and regulating valve are installed on the lower part (17). 5. The reactor according to claim 4, characterized in that, the bottom helical blade (14) in the second-stage reactor rotates without electric power, and utilizes the tangential impact rotation of the bottom water and airflow to stir the water flow to spiral up. 6. The reactor according to claim 4, characterized in that, the multi-layer perforated baffles (15) added on the top of the second-stage reactor are respectively perforated near the inner ring of the casing and the outer ring of the far casing, and the holes Displaced arrangement with the holes to achieve three-dimensional cross-flow, to achieve the purpose of mixing inside and outside and flushing the casing. 7. The reactor according to claim 4, characterized in that: the headspace part of the second-stage reaction device is also equipped with a tail ozone air duct (5), which is used to guide unreacted ozone into the first-stage reaction device Participate in self-circulation reactions.

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