CN113401993A - Device and method for inactivating pathogenic microorganisms in water body - Google Patents
Device and method for inactivating pathogenic microorganisms in water body Download PDFInfo
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- CN113401993A CN113401993A CN202110672184.6A CN202110672184A CN113401993A CN 113401993 A CN113401993 A CN 113401993A CN 202110672184 A CN202110672184 A CN 202110672184A CN 113401993 A CN113401993 A CN 113401993A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
The invention discloses a device and a method for inactivating pathogenic microorganisms in water. The corona discharge system comprises a grounding electrode plate and a high-voltage electrode plate, a corona discharge reaction tank is formed between the high-voltage electrode plate and the grounding electrode plate, and a plurality of discharge needles are arranged on the high-voltage electrode plate; the dielectric barrier discharge system comprises a coaxial inner tube electrode and a coaxial outer tube electrode, an annular columnar air gap is formed between the coaxial inner tube electrode and the coaxial outer tube electrode, a dielectric barrier discharge reaction tank is formed between the coaxial outer tube electrode and the reaction tank, the annular columnar air gap is connected with an aeration head, the aeration head is positioned in the dielectric barrier discharge reaction tank, and the dielectric barrier discharge reaction tank is communicated with the corona discharge reaction tank; the air source is connected with the annular columnar air gap and the discharge needle, the water source is connected with the corona discharge reaction tank, and the water outlet is used for discharging wastewater. The device can inactivate pathogenic microorganisms in the water body.
Description
Technical Field
The invention belongs to the field of water pollution control, relates to the control of pathogenic microorganism pollution in a water body, and particularly relates to a device and a method for inactivating pathogenic microorganisms in the water body.
Background
Water is an important substance for maintaining human life and sometimes an important vehicle for transmitting diseases. In recent decades, humans have been at risk of disease caused by water transmission of pathogenic microorganisms more than once. It is reported that 26% of all human deaths worldwide are caused directly or indirectly by pathogenic microorganisms, about 1500 over ten thousand cases per year, and more than 1000 pathogenic microorganisms may exist in the water environment polluted by feces, sewage and garbage, and are mainly classified into four types of viruses, bacteria, protozoa and parasites, which can cause diseases such as gastroenteritis, dysentery and septicemia. The urbanization of China is rapidly progressed due to the continuous development of economy, the discharge amount of domestic sewage is rapidly increased, at present, in more than 600 cities in China, a city close to 1/6 has no sewage treatment capacity, a large amount of domestic sewage is directly discharged into a water body, the domestic sewage containing human and animal excreta carries a large amount of pathogenic microorganisms into the water body, the safety and the body health of people are directly threatened, and particularly in poor and laggard areas, water-mediated infectious diseases are still important diseases which are harmful to the health of local people. Therefore, the control of pathogenic microorganism pollution in water is one of the water environment problems to be solved urgently at present.
Currently, the inactivation of pathogenic microorganisms in water in China is mainly carried out by chlorination disinfection. However, the action of chlorine in water is quite complex, and it can not only react oxidatively, but also react with naturally occurring organics in the water in substitution or addition reactions to produce by-products with deleterious effects. Currently, the byproducts that have been identified and have adverse effects on humans and animals are trihalomethanes, haloacetic acids, and high bromide ions, among which trihalomethanes and haloacetic acids have carcinogenic and carcinogenic effects on humans. Chlorine dioxide is a safe and efficient powerful bactericide determined by the world health organization, and is an ideal updated substitute product in the internationally recognized chlorine series disinfectants. The chlorine dioxide has wide inactivation range and strong inactivation capacity on microorganisms, has good killing effect on heterotrophic bacteria such as escherichia coli and the like, autotrophic bacteria such as iron bacteria and sulfate reducing bacteria and the like, poliovirus, hepatitis virus, giardia cysts and the like besides the killing effect on common bacteria, has the inactivation effect basically not influenced by pH value, does not generate drug resistance, and has 2 times of continuous sterilization capacity compared with chlorine. However, chlorine dioxide also produces by-products. Chlorine dioxide, when added to water, is reduced primarily to chlorite, which causes hemolytic anemia and increases in human methemoglobin and is identified by international cancer research as a carcinogen.
The method for inactivating pathogenic microorganisms in water by ultraviolet rays belongs to a physical inactivation method, does not need to add any medicament, does not generate byproducts, does not increase the genetic toxicity of pollutants, has high sterilization speed, high sterilization rate, easy operation, high management and automation degree, and is a green inactivation method. But the defects of incapability of solving the problem of recontamination of the pathogenic microorganisms in a pipe network after disinfection, high power consumption and the like exist in ultraviolet inactivation. The inactivation effect of ultraviolet light is related to the ability of ultraviolet light to transmit water. Suspended substances, dissolved organic matters and water molecules in the water have the absorption effect on ultraviolet rays. When the suspension concentration in water is high, the disinfection effect is not complete.
Ozone is one of the most effective of the chemical disinfectants known today. The ozone water solution formed by mixing the ozone and the water has strong bactericidal effect, and can quickly and widely kill various microorganisms and pathogenic bacteria. According to current research, ozone is more desirable than chlorine and chlorine dioxide, both in terms of the amount and toxicity of by-products produced, and in terms of mutagenicity of the effluent. Ozone oxidation is very powerful, but not perfect. When the raw water contains bromide, bromate harmful to human body is formed under the oxidation action of ozone. Bromate is classified as a potential carcinogen at class 2B (higher carcinogenic potential) by the international agency for research on cancer.
In view of the above, there is a need for a novel inactivation scheme for water-borne pathogenic microorganisms, which can overcome the above-mentioned problems of the existing inactivation schemes for pathogenic microorganisms while ensuring the inactivation effect.
Disclosure of Invention
The invention aims to provide a device and a method for inactivating pathogenic microorganisms in a water body, so as to solve the problem that the existing pathogenic microorganism inactivation technology has a defective inactivation effect.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a device for inactivating pathogenic microorganisms in a water body, which mainly comprises:
a reaction tank;
the corona discharge system is arranged in the reaction tank and comprises a grounding electrode plate and a high-voltage electrode plate, wherein the high-voltage electrode plate is positioned on one side of the grounding electrode plate, and a corona discharge reaction tank is formed between the high-voltage electrode plate and the grounding electrode plate; the high-voltage electrode plate is used for being connected with a high-voltage output end of a direct-current high-voltage power supply, the grounding electrode plate is used for being connected with the ground, and a plurality of discharge needles communicated with the corona discharge reaction tank are arranged on the high-voltage electrode plate;
the dielectric barrier discharge system is arranged in the reaction tank and is positioned on the other side of the grounding electrode plate; the dielectric barrier discharge system comprises a coaxial inner tube electrode and a coaxial outer tube electrode sleeved outside the coaxial inner tube electrode, two ends of the coaxial inner tube electrode are sealed, and an annular columnar air gap is formed between the coaxial inner tube electrode and the coaxial outer tube electrode; the coaxial inner tube electrode is used for being connected with a high-voltage output end of an alternating-current high-voltage power supply, a dielectric barrier discharge reaction tank is formed between the coaxial outer tube electrode and the reaction tank, the annular columnar air gap is connected with an aerator, the aerator is positioned in the dielectric barrier discharge reaction tank, and the dielectric barrier discharge reaction tank is communicated with the corona discharge reaction tank;
the gas source is connected with the annular cylindrical air gap and the discharge needles and used for supplying gas to the annular cylindrical air gap and the discharge needles, and corona discharge or dielectric barrier discharge occurs in the corona discharge system or the dielectric barrier discharge system, so that the gas is ionized to generate various active species accompanied with some chemical and physical processes;
the water source is connected with the corona discharge reaction tank and is used for introducing water to be inactivated into the corona discharge reaction tank;
and the water outlet is arranged in the dielectric barrier discharge reaction tank, and the water body sequentially passes through the corona discharge reaction tank and the dielectric barrier discharge reaction tank to be discharged from the water outlet.
Optionally, the gas outlet system is further included, and the gas outlet system includes:
the gas outlet is arranged at the top of the dielectric barrier discharge reaction tank and used for discharging waste gas in the dielectric barrier discharge reaction tank and the corona discharge reaction tank;
and the ozone quencher is connected with the air outlet and is used for quenching the ozone in the waste gas.
Optionally, the ground electrode plate and the high-voltage electrode plate are arranged in the reaction tank at intervals from top to bottom, and the reaction tank is sequentially divided into the dielectric barrier discharge reaction tank, the corona discharge reaction tank and the corona discharge air chamber from top to bottom;
wherein, the corona discharge air chamber is connected the air supply, and pass through the discharge needle with the corona discharge reaction tank intercommunication, so that the discharge needle introduces gas the corona discharge reaction tank.
Optionally, a plurality of through holes are formed in the grounding electrode plate to communicate the corona discharge reaction tank with the dielectric barrier discharge reaction tank.
Optionally, the coaxial inner tube electrode and the coaxial outer tube electrode are coaxially arranged, and the coaxial inner tube electrode and the coaxial outer tube electrode are fixed at intervals through fixing fittings.
Optionally, the gas source is one or more of air, oxygen and ozone.
Optionally, a gas flowmeter is connected between the gas source and the discharge needle and between the annular columnar air gap and the discharge needle.
Optionally, the water source is connected with the corona discharge reaction tank through a water pump.
Optionally, the water outlet is connected to the water source to achieve circulation of the water body.
Meanwhile, the invention provides a method for inactivating pathogenic microorganisms in water, which can be implemented by adopting the device and mainly comprises the following steps:
injecting gas into the corona discharge reaction cell and the annular cylindrical air gap;
injecting a water body to be subjected to inactivation treatment into the corona discharge reaction tank and the dielectric barrier discharge reaction tank;
at least starting the corona discharge systemAnd one of the dielectric barrier discharge systems enables the corona discharge system and the dielectric barrier discharge system to generate corona discharge or dielectric barrier discharge, so that various active species are generated and act on the water body along with some chemical and physical processes; during corona discharge or dielectric barrier discharge, gas in the corona discharge reaction tank or the annular columnar air gap is ionized to generate a large amount of electrons, the voltage applied by the direct-current high-voltage power supply or the alternating-current high-voltage power supply enables the electrons to obtain energy and then bombard other molecules or atoms to generate excited state atoms and other active groups, and the high-energy electrons, the molecules, the atoms and the active groups react with water to generate H2O2、·OH、HO2Active species such as O, H and the like which chemically react with pathogenic microorganisms in the water body to inactivate the pathogenic microorganisms in the water body; in the corona discharge or dielectric barrier discharge process, due to the ionization and transition of molecules, physical processes such as ultraviolet light, ultrasound, shock waves, local high temperature and the like can be generated, so that the inactivation of pathogenic microorganisms in the water body is further accelerated;
and finishing the inactivation treatment of pathogenic microorganisms in the water body, and discharging the treated water body from the water outlet.
Compared with the prior art, the invention has the following technical effects:
the device for inactivating pathogenic microorganisms in the water body disclosed by the invention couples the corona discharge system and the dielectric barrier discharge system, has exquisite structural arrangement and realizes the unification of corona discharge and dielectric barrier discharge. The invention simultaneously acts various active species generated by corona discharge under an uneven electric field and dielectric barrier discharge under an even electric field as well as physical and chemical effects on the water body, and the advantages of the two systems are complementary, thereby achieving the effect of efficiently inactivating pathogenic microorganisms in the water body, particularly having excellent effect of inactivating parvovirus, being 5000 times of the efficiency of the existing inactivation method, obviously improving the safety of the water body, having short treatment time, no secondary pollution, low energy consumption and simple and convenient operation, greatly reducing the operation cost, and having good industrial application prospect.
The corona discharge system and the dielectric barrier discharge system can be operated independently or simultaneously to realize coupling, and can adapt to inactivation treatment of various water bodies.
The invention also provides a method for inactivating pathogenic microorganisms in the water body, which has the advantages of simple and convenient operation, low operation cost, good inactivation effect, strong practicability and suitability for the treatment of various organic wastewater, such as printing and dyeing wastewater, tanning wastewater, kitchen wastewater, garbage leachate wastewater and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an apparatus for inactivating pathogenic microorganisms in a water body according to an embodiment of the present invention;
FIG. 2A is a graph showing the titer of spring viraemia of carp virus on Hemiculter nigricans epithelial tumor cells after treatment with the apparatus disclosed in the embodiments of the present invention for various periods of time;
FIG. 2B is a graph showing a comparison of the survival rates of zebrafish not injected with the carp spring viremia virus, zebrafish injected with the carp spring viremia virus, and zebrafish injected with the carp spring viremia virus treated for 5min by the apparatus disclosed in the embodiments of the present invention;
FIG. 3 is a diagram illustrating the inactivation effect of the device disclosed in the present invention on Microcystis aeruginosa in a water body;
FIG. 4 is a diagram illustrating the inactivation effect of the apparatus disclosed in the present invention on Escherichia coli in a water body.
Wherein the reference numerals are: 1. the device comprises a high-voltage power supply system, a reaction tank, a corona discharge system, a dielectric barrier discharge system, a gas source, a water pump, an ozone quencher, a direct-current high-voltage power supply, a 9 alternating-current high-voltage power supply, a 10 high-voltage electrode plate, a 11 grounding electrode plate, a 12 corona discharge gas chamber, a 13 corona discharge reaction tank, a 14 dielectric barrier discharge reaction tank, a 15 gas inlet, a 16 water inlet, a 17 water outlet, an 18 gas outlet, a 19 discharge needle, a 20 coaxial inner tube electrode, a 21 coaxial outer tube electrode, a 22 fixing accessory, a 23 aeration head, a 24 gas inlet, a 25 gas flowmeter and a 26 gas flowmeter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One of the purposes of the present invention is to provide a device for inactivating pathogenic microorganisms in a water body, so as to solve the problem that the inactivation effect of the existing pathogenic microorganism inactivation technology is imperfect.
The invention also aims to provide a method for inactivating pathogenic microorganisms in water body, which is implemented by adopting the device for inactivating pathogenic microorganisms in water body.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
as shown in fig. 1, the present embodiment provides a novel device for inactivating pathogenic microorganisms in a water body, which mainly includes a high-voltage power supply system 1, a reaction tank 2, a corona discharge system 3, a dielectric barrier discharge system 4, an air source 5, a water pump 6, and an ozone quencher 7. Wherein:
the high-voltage power supply system 1 is composed of a direct-current high-voltage power supply 8 and an alternating-current high-voltage power supply 9, and is used for providing high-voltage electric energy for the corona discharge system 3 and the dielectric barrier discharge system 4 respectively.
The reaction tank 2 is divided into three areas of a corona discharge air chamber 12, a corona discharge reaction tank 13 and a dielectric barrier discharge reaction tank 14 from bottom to top by a high-voltage electrode plate 10 and a grounding electrode plate 11 in the corona discharge system 3; the corona discharge air chamber 12 is provided with an air inlet 15, the corona discharge reaction tank 13 is provided with a water inlet 16, and the dielectric barrier discharge reaction tank 14 is provided with a water outlet 17 and an air outlet 18.
A high-voltage electrode plate 10 of the corona discharge system 3 is connected with a high-voltage output end of a direct-current high-voltage power supply 8 of the high-voltage power supply system 1, a plurality of discharge needles 19 which are arranged at the same height are distributed on the high-voltage electrode plate 10, and the discharge needles 19 are communicated with a corona discharge air chamber 12 and a corona discharge reaction tank 13; the grounding electrode plate 11 is connected with the ground, and a plurality of through holes are distributed on the grounding electrode plate 11 to communicate the corona discharge reaction tank 13 and the dielectric barrier discharge reaction tank 14.
The dielectric barrier discharge system 4 is arranged in the dielectric barrier discharge reaction tank 14 and mainly comprises a coaxial inner tube electrode 20, a coaxial outer tube electrode 21, a fixing fitting 22 and an aeration head 23, wherein the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 are fixed coaxially by the fixing fitting 22, an annular columnar air gap is formed between the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21, and a uniform air gap interval is kept between the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21. The coaxial inner tube electrode 20 is connected with the high-voltage output end of the alternating current high-voltage power supply 9 of the high-voltage power supply system 1, and the coaxial inner tube electrode 20 can be made of heat-resistant and oxidation-resistant conductive materials, such as stainless steel, graphite and the like, or heat-resistant and oxidation-resistant insulating materials, such as ceramics and SiO2、Al2O3If the coaxial inner tube electrode 20 is made of heat-resistant and oxidation-resistant insulating material, a conductive material can be pasted, coated or plated on the outer wall of the insulating material, and the conductive material is connected with the high-voltage end of the alternating-current high-voltage power supply 9 of the high-voltage power supply system 1; the coaxial outer tube electrode 21 is preferably made of a heat-resistant, oxidation-resistant insulating material, such as ceramic, SiO2、Al2O3And the like; the lower end of an annular columnar air gap between the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 is connected with an aeration head 23, and the upper end is provided with an air inlet 24.
The gas source 5 is connected to the gas inlet 15 of the corona discharge gas chamber 12 and the gas inlet 24 of the dielectric barrier discharge system 4, respectively, and is configured to provide gas to the corona discharge system 3 and the dielectric barrier discharge system 4, the gas injected into the corona discharge system 3 and the dielectric barrier discharge system 4 may be air, oxygen, nitrogen, ozone, argon, or a mixture of at least two of air, oxygen, nitrogen, ozone, argon, or the like, and the gas flow meter 25 and the gas flow meter 26 are configured to control the gas flow rate injected into the corona discharge system 3 and the dielectric barrier discharge system 4, respectively.
The water source is connected with the water inlet 16 of the corona discharge reaction tank 13 through the water pump 6 and is used for injecting waste water, namely water to be inactivated, into the corona discharge reaction tank 13.
The ozone quenching device 7 is connected with an air outlet 18 of the dielectric barrier discharge reaction tank 14 and is mainly used for quenching the ozone discharged from the dielectric barrier discharge reaction tank 14 and the corona discharge reaction tank 13. The ozone quencher is an existing ozone quenching device or component, and the "quenching" is an existing process, and is not described herein again.
A method for inactivating pathogenic microorganisms in water body implemented by adopting the device for inactivating pathogenic microorganisms in water body comprises the following specific implementation steps:
I. opening a gas source 5, adjusting a gas flowmeter 25, injecting gas into the corona discharge system 3, enabling the gas to enter a corona discharge gas chamber 12 through a gas inlet 15 of the corona discharge gas chamber 12, then entering a corona discharge reaction tank 13 through a high-voltage electrode plate 10 and a discharge needle 19 of the corona discharge system 3, then entering a dielectric barrier discharge reaction tank 14 through a grounding electrode plate 11 of the corona discharge system 3, finally discharging the gas from a gas outlet 18 of the dielectric barrier discharge reaction tank 14, enabling the gas to enter an ozone quencher 7, and discharging quenched tail gas into the atmosphere; and adjusting a gas flowmeter 26, injecting gas into the dielectric barrier discharge system 4, enabling the gas to enter an air gap between a coaxial inner tube electrode 20 and a coaxial outer tube electrode 21 of the dielectric barrier discharge system 4 through a gas inlet 24 of the dielectric barrier discharge system 4, then enabling the gas to enter the dielectric barrier discharge reaction tank 14 through an aerator 23, finally enabling the gas to be discharged into an ozone quencher 7 through a gas outlet 18 of the dielectric barrier discharge reaction tank 14, and discharging quenched tail gas into the atmosphere.
II. Starting a water pump 6, injecting wastewater into a corona discharge reaction tank 13, enabling the wastewater to pass through a through hole on a grounding electrode plate 11 of a corona discharge system 3, enter a dielectric barrier discharge reaction tank 14, and finally discharging the wastewater from a water outlet 17 of the dielectric barrier discharge reaction tank 14; in order to improve the treatment load and efficiency of the wastewater, the wastewater discharged from the dielectric barrier discharge reaction tank 14 is re-injected into the corona discharge reaction tank 13 through the water pump 6, so as to realize the cyclic treatment of the wastewater.
And III, starting a direct-current high-voltage power supply 8 and an alternating-current high-voltage power supply 9 of the high-voltage power supply system 1, starting an ozone quenching device 7, and treating the wastewater for 1-120 min. IV, after the treatment is finished, sequentially closing a direct-current high-voltage power supply 8 and an alternating-current high-voltage power supply 9 of the high-voltage power supply system 1, taking out the treated water, and closing the gas source 5 and the ozone quencher 7 to finish the treatment.
In actual operation, the corona discharge system 3 and the dielectric barrier discharge system 4 can be operated in a coupling mode or independently according to different pathogenic microorganisms in water bodies to be treated, namely wastewater.
In practical operation, when the wastewater is injected into the corona discharge reaction tank 13, firstly, gas is introduced into the corona discharge system 3 and the dielectric barrier discharge system 4, otherwise, the wastewater may flow into the corona discharge gas chamber 12 through the high-voltage electrode plate 10 and the discharge needle 19 of the corona discharge system 3, or enter into the annular cylindrical air gap between the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 of the dielectric barrier discharge system 4 through the aeration head 23, thereby affecting the corona discharge and the dielectric barrier discharge.
In practical operation, the distances between the tips of the discharge needles 19 on the high-voltage electrode plates 10 in the corona discharge system 3 and the ground electrode plates 11 are preferably consistent, the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 of the dielectric barrier discharge system 4 are kept coaxial, and the air gap distance is uniform, otherwise, partial discharge occurs, and the wastewater treatment effect is affected.
In practical operation, the gas flow rate and the wastewater flow rate injected into the system cannot be too large or too small, otherwise, the discharge state and the wastewater treatment effect are affected.
In actual operation, the correctness and safety of the power supply system should be checked before the start-up of the equipment, while ensuring the airtightness of the system.
In this embodiment, the dc high voltage power supply 8 in the high voltage power supply system 1 preferably adopts a negative polarity high voltage dc pulse power supply, the frequency is 75Hz, and the peak voltage is 22.4 kV; the alternating-current high-voltage power supply 9 in the high-voltage power supply system 1 preferably adopts a high-frequency alternating-current high-voltage power supply, the frequency is 6kHz, and the peak voltage is 19.6 kV.
In this embodiment, the reaction tank 2 is preferably a cylindrical tank made of organic glass, and has an inner diameter of 6cm and a height of 50 cm.
In this embodiment, the high voltage electrode plate 10 and the grounding electrode plate 11 in the corona discharge system 3 divide the reaction tank 2 into three parts, namely a corona discharge gas chamber 12 with a height of 5cm, a corona discharge reaction tank 13 with a height of 5cm and a dielectric barrier discharge reaction tank 14 with a height of 40cm, the high voltage electrode plate 10 and the grounding electrode plate 11 in the corona discharge system 3 are both preferably stainless steel round plates with a thickness of 2mm, and the peripheries of the high voltage electrode plate 10 and the grounding electrode plate 11 are both in sealed butt joint with the inner wall of the cylindrical reaction tank. Wherein, the high-voltage electrode plate 10 is connected with the high-voltage output end of the negative polarity high-voltage direct current pulse power supply, and 7 pieces of 14 electrodes are preferably and uniformly distributed on the high-voltage electrode plate 10#The injection needle head is used as a discharge needle 19, the distance between the top end of each discharge needle 19 and the grounding electrode plate 11 is 1.0cm, the grounding electrode plate 11 is connected with the ground, and 24 through holes with the diameter of 1cm are preferably formed in the grounding electrode plate 11.
In this embodiment, preferably, the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 in the dielectric barrier discharge system 4 are both quartz glass tubes, the coaxial inner tube electrode 20 has an outer diameter of 3cm, a wall thickness of 2mm, and two ends of a length of 30cm are sealed, and a layer of aluminum foil with a thickness of 0.2mm and a height of 25mm is attached to the outer wall; the coaxial outer tube electrode 21 has the inner diameter of 4cm, the wall thickness of 2mm and the length of 35 cm; two coaxial hollow rings with the outer diameter of 4cm and the inner diameter of 3.2cm are used as fixing fittings 22 to fix the coaxial inner tube electrode 20 and the coaxial outer tube electrode 21 coaxially.
In this embodiment, the aeration head 23 is preferably a microporous ceramic sheet having micropores of 50 μm, a thickness of 5mm, and a diameter of 4.5 cm.
The method and the device for inactivating pathogenic microorganisms in water according to the embodiment are specifically described below by taking the inactivation of spring viremia of carp virus in water as an example. Wherein, the gas source 5 is preferably oxygen, the water pump 6 is preferably a peristaltic pump, and the ozone quencher 7 is an existing quencher, and the specific structure and the working principle are not described herein again.
Firstly, injecting oxygen into a corona discharge system 3 and a dielectric barrier discharge system 4, respectively adjusting a gas flow meter 25 and a gas flow meter 26 to be 3L/min and 5L/min, then injecting 500mL of wastewater containing spring carp viremia virus (the spring carp viremia virus is one of infectious diseases viruses which have the greatest harm to cyprinid fishes and is specified as one of animal epidemic diseases which must be declared by the world animal health organization, and is listed as animal epidemic diseases in the famous list of newly issued animal epidemic diseases in China), circulating the wastewater by a peristaltic pump, wherein the circulating flow rate of the wastewater is 150 mL/min; starting a direct-current high-voltage power supply 8 and an alternating-current high-voltage power supply 9 of the high-voltage power supply system 1, starting the ozone quenching device 7, and treating the wastewater for 5 min. 10mL of sample is taken every 1min to analyze the activity of the spring viremia of carp virus. The activity of the spring viremia of carp virus is analyzed by adopting a half tissue infection quantity method and observing the infection condition of the spring viremia of carp virus on zebra fish. As shown in fig. 2 (fig. 2 refers to fig. 2A and/or fig. 2B), the inactivation effect of the present embodiment on the spring viremia of carp virus in the water body is shown. As can be seen from fig. 2A: the titer of the cyprinid spring viraemia virus in the water body treated by the method and the device of the embodiment on the Hemiculter nigrum epithelial tumor cells is gradually reduced along with the increase of the treatment time, and the titer of the cyprinid spring viraemia virus in the water body treated by the method and the device of the embodiment for 5min is changed from the initial titer of 1012Down to 102PFU/ml; as can be seen from fig. 2B: the zebra fish injected with the carp spring viremia virus without the treatment of the method and the device of the embodiment died from day 2, and the cumulative mortality rate reaches 100%, while the zebra fish injected with the carp spring viremia virus treated for 5min by the method and the device of the embodiment has no obvious difference from the control group (zebra fish without the injection of the virus). This result shows that: the method and the device for inactivating pathogenic microorganisms in the water body can quickly and effectively inactivate viruses in the water body.
Example 2:
according to the method and the device for inactivating pathogenic microorganisms in the water body disclosed in the embodiment 1, the microcystis aeruginosa in the water body is inactivated. The method comprises the following specific steps:
500mL of microcystis aeruginosa wastewater is treated for 60min, and 10mL of samples are taken every 5-10min to analyze the inactivation effect of the microcystis aeruginosa. The inactivation effect of microcystis aeruginosa is analyzed by the change of ultraviolet-visible absorbance of the algae cell solution at 680 nm. FIG. 3 shows the inactivation effect of this example on Microcystis aeruginosa in water, and it can be seen from FIG. 3 that: after 60min treatment, the inactivation rate of microcystis aeruginosa is close to 100%. Therefore, the method and the device for inactivating pathogenic microorganisms in water also have good inactivation effect on microcystis aeruginosa in water.
Example 3:
according to the method and the device for inactivating pathogenic microorganisms in the water body disclosed in the embodiment 1, the escherichia coli in the water body is inactivated. The method comprises the following specific steps:
500mL of escherichia coli wastewater is treated for 60min, and 10mL of samples are taken every 5-10min to analyze the inactivation effect of escherichia coli. The inactivation effect of E.coli was analyzed by measuring the amount of E.coli by multi-tube fermentation. FIG. 4 shows the inactivation effect of the present invention on Escherichia coli in a water body, as can be seen from FIG. 4: after 60min treatment, the inactivation rate of the escherichia coli reaches more than 90%. This shows that the method and the device for inactivating pathogenic microorganisms in water body of the embodiment have good inactivation effect on escherichia coli in water.
Therefore, the method and the device for inactivating pathogenic microorganisms in water body provided by the embodiment utilize high-energy electrons, ozone molecules, hydrogen peroxide molecules and free radicals (such as. OH and HO) generated by corona discharge or dielectric barrier discharge in a corona discharge system and a dielectric barrier discharge system2Chemical processes of active species such as O, H) and the like and accompanying physical processes such as ultraviolet light, ultrasound, shock waves, local high temperature and the like to inactivate pathogenic microorganisms in the water body. The present embodiment integrates various effects of light, electricity, heat, etc. and the advantages of the effects are complementary, so that the present embodiment can integrate the effectsThe method has the advantages of effectively inactivating various pathogenic microorganisms in the water body, particularly having very good effect of inactivating parvovirus, being 5000 times of the efficiency of the existing inactivation method, remarkably improving the safety of the water body, having short treatment time, no secondary pollution, low energy consumption, simple and convenient operation, greatly reducing the operation cost, having good industrial application prospect, and being also applicable to water body inactivation treatment of other organic wastewater, such as printing and dyeing wastewater, tanning wastewater, kitchen wastewater, garbage leachate wastewater and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An apparatus for inactivating pathogenic microorganisms in a body of water, comprising:
a reaction tank;
the corona discharge system is arranged in the reaction tank and comprises a grounding electrode plate and a high-voltage electrode plate, wherein the high-voltage electrode plate is positioned on one side of the grounding electrode plate, and a corona discharge reaction tank is formed between the high-voltage electrode plate and the grounding electrode plate; the high-voltage electrode plate is used for being connected with a high-voltage output end of a direct-current high-voltage power supply, the grounding electrode plate is used for being connected with the ground, and a plurality of discharge needles communicated with the corona discharge reaction tank are arranged on the high-voltage electrode plate;
the dielectric barrier discharge system is arranged in the reaction tank and is positioned on the other side of the grounding electrode plate; the dielectric barrier discharge system comprises a coaxial inner tube electrode and a coaxial outer tube electrode sleeved outside the coaxial inner tube electrode, two ends of the coaxial inner tube electrode are sealed, and an annular columnar air gap is formed between the coaxial inner tube electrode and the coaxial outer tube electrode; the coaxial inner tube electrode is used for being connected with a high-voltage output end of an alternating-current high-voltage power supply, a dielectric barrier discharge reaction tank is formed between the coaxial outer tube electrode and the reaction tank, the annular columnar air gap is connected with an aerator, the aerator is positioned in the dielectric barrier discharge reaction tank, and the dielectric barrier discharge reaction tank is communicated with the corona discharge reaction tank;
the gas source is connected with the annular cylindrical air gap and the discharge needle and used for supplying gas to the annular cylindrical air gap and the discharge needle;
the water source is connected with the corona discharge reaction tank and is used for introducing water to be inactivated into the corona discharge reaction tank;
and the water outlet is arranged in the dielectric barrier discharge reaction tank, and the water body sequentially passes through the corona discharge reaction tank and then is discharged from the water outlet after the dielectric barrier discharge reaction tank.
2. The apparatus of claim 1, further comprising an air egress system, the air egress system comprising:
the gas outlet is arranged at the top of the dielectric barrier discharge reaction tank and used for discharging waste gas in the dielectric barrier discharge reaction tank and the corona discharge reaction tank;
and the ozone quencher is connected with the air outlet and is used for quenching the ozone in the waste gas.
3. The device according to claim 1 or 2, wherein the grounding electrode plate and the high-voltage electrode plate are arranged in the reaction tank at intervals from top to bottom and divide the reaction tank into the dielectric barrier discharge reaction tank, the corona discharge reaction tank and the corona discharge air chamber from top to bottom in sequence;
wherein, the corona discharge air chamber is connected the air supply, and pass through the discharge needle with the corona discharge reaction tank intercommunication, so that the discharge needle introduces gas the corona discharge reaction tank.
4. The device according to claim 1 or 2, wherein the grounding electrode plate is provided with a plurality of through holes for communicating the corona discharge reaction tank and the dielectric barrier discharge reaction tank.
5. The device according to claim 1 or 2, wherein the coaxial inner tube electrode and the coaxial outer tube electrode are coaxially arranged, and the coaxial inner tube electrode and the coaxial outer tube electrode are fixed at intervals by a fixing fitting.
6. The apparatus of claim 1 or 2, wherein the gas source is one or more of air, oxygen, and ozone.
7. The device of claim 1 or 2, wherein a gas flow meter is connected between the gas source and the annular cylindrical air gap and the discharge needle.
8. The apparatus of claim 1 or 2, wherein the water source is connected to the corona discharge reaction tank by a water pump.
9. The apparatus of claim 1 or 2, wherein the water outlet is connected to the water source to effect circulation of the body of water.
10. A method for inactivating pathogenic microorganisms in a water body, which is implemented by using the apparatus of any one of claims 1 to 9, and comprises the following steps:
injecting gas into the corona discharge reaction cell and the annular cylindrical air gap;
injecting a water body to be subjected to inactivation treatment into the corona discharge reaction tank and the dielectric barrier discharge reaction tank;
at least starting one of the corona discharge system and the dielectric barrier discharge system to enable corona discharge or dielectric barrier discharge to occur in the corona discharge system and/or the dielectric barrier discharge system and act on the water body;
and discharging the treated water body from the water outlet.
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| CN202110672184.6A CN113401993A (en) | 2021-06-17 | 2021-06-17 | Device and method for inactivating pathogenic microorganisms in water body |
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| CN202110672184.6A CN113401993A (en) | 2021-06-17 | 2021-06-17 | Device and method for inactivating pathogenic microorganisms in water body |
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