CN104085951A - Device and method for effectively treating algae-containing sewage by means of dielectric barrier discharge plasma - Google Patents
Device and method for effectively treating algae-containing sewage by means of dielectric barrier discharge plasma Download PDFInfo
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Abstract
The invention discloses a device for effectively treating algae-containing sewage by means of dielectric barrier discharge plasma. The device comprises a treatment water tank, an upper electrode plate and a lower electrode plate, wherein the interior of the treatment water tank is provided with a hollow cavity; the top of the treatment water tank is provided with an air inlet and an air outlet; the upper part of one side of the treatment water tank is provided with a water inlet; the bottom part of one side of the treatment water tank is provided with a water outlet; the upper electrode plate is horizontally arranged on the upper part of the hollow cavity of the treatment water tank; the lower electrode plate is horizontally arranged under the bottom part of the treatment water tank; the upper electrode plate and the lower electrode plate are oppositely arranged in the vertical direction and are respectively connected with a power supply; an insulating stirrer which extends into the hollow cavity is also arranged on the lower part of one side of the treatment water tank. The invention also discloses a method for effectively treating algae-containing sewage by means of dielectric barrier discharge plasma. The device and method have the advantages of high sewage treatment efficiency and high treatment rate; the inactivation ratio of algae cells and the degradation rate of algal toxin are improved; the device is low in cost and easy to operate; secondary pollution is avoided.
Description
Technical field
The present invention relates to environmental wastewater processing technology field, in particular the efficient device and method of processing containing algae sewage of a kind of dielectric barrier discharge plasma.
Background technology
The water body eutrophication degree plant plankton hyper-proliferatives such as causing blue-green algae that increasingly sharpens, and discharge various algae toxin, serious harm human health and drinking water safety.At present, in removal water, the toxic substance of microorganism and microorganisms is still the difficult point of water technology, and conventional processing containing the method for micro-algae sewage is to use chemical algicide, clay, activated carbon filtration, ultraviolet light irradiation, microwave treatment etc., they often have treatment technology complexity, bring secondary pollution problems, and general treatment technology and method can not be processed algae and algae toxin simultaneously.
Plasma discharge technology is a kind of high-level oxidation technology, can be applied in sewage disposal.Plasma discharge process is very complicated, produces a large amount of charged particles and active substance in discharge process, and follows the physical factors such as light, heat, electricity, sound.The charged particle that plasma discharge produces comprises ion and electronics, and produces excited atom, molecule (O
3, H
2o
2) and a large amount of active substances (OH, H, O etc.).This technological operation is simple, processing efficiency is high, non-secondary pollution, so more and more receive domestic and international investigator's concern.We show by existing experimental study, and plasma discharge can kill Cells of Blue-green Algae and the algae toxin of degrading simultaneously, is a kind of technology that has very much application prospect.Have now multiplely about plasma discharge mode, how plasma technique is applied to efficiently, easily containing algae sewage disposal, just the object of the invention place.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of dielectric barrier discharge plasma the efficient device and method of processing containing algae sewage.
The present invention is achieved by the following technical solutions:
The efficient device of processing containing algae sewage of dielectric barrier discharge plasma, comprise the processing water tank of sealing, described processing water tank inside is provided with cavity, described processing tank top is provided with inlet mouth and air outlet, described processing water tank one upper lateral part is provided with water-in, described processing water tank one side bottom is provided with water outlet, described device also comprises electric pole plate and lower electrode plate, the top of the cavity that is arranged at described processing water tank of described electric pole plate level, under the bottom that is arranged at described processing water tank of described lower electrode plate level, described electric pole plate and lower electrode plate are oppositely arranged in vertical direction and are connected respectively on power supply, the cavity of described processing water tank is interior for accommodating pending containing algae sewage, gapped containing interval between the upper surface of algae sewage and the lower surface of described electric pole plate described in when work in cavity, described processing water tank one side lower part is also provided with the insulation agitation means stretching in described cavity.
As the efficient preferred implementation of processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma, described power supply is high-voltage ac power, and described high-voltage ac power is connected with oscilloscope.
As the efficient preferred implementation of processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma, described electric pole plate and lower electrode plate are stainless steel plate.
As the efficient preferred implementation of processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma, described processing water tank is glass water tank.
As the efficient preferred implementation of processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma, described water-in is connected respectively water inlet pipe and rising pipe outward with water outlet, on described water inlet pipe and rising pipe, is respectively arranged with valve.
The present invention also provides dielectric barrier discharge plasma the efficient method of processing containing algae sewage, and it adopts efficient the processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma to process, and comprises the steps:
(1) drop into and process in the cavity of water tank containing algae sewage pending, and add sodium-chlor pending containing in algae sewage, pending in cavity is no more than 1cm containing gap between the upper surface of algae sewage and the lower surface of electric pole plate;
(2) in from inlet mouth to cavity, pass into air, open insulation agitation means stirs containing algae sewage pending simultaneously, then start power supply, start to carry out low temperature normal atmosphere plasma electric discharge between electric pole plate and lower electrode plate, sparking voltage is more than 300V;
(3) in plasma discharge process, sample by water outlet, measure the wherein concentration of frustule and the concentration of algae toxin, thereby obtain the inactivation ratio of different time frustule and the degradation efficiency of algae toxin, meet after sewage disposal index until reach, close power supply.
As the efficient preferred implementation of processing containing the method for algae sewage of above-mentioned dielectric barrier discharge plasma, in described step (2), the gas flow that passes into air in from inlet mouth to cavity is 0.15L/min, received current is 1.55-1.85A, sparking voltage is 400V, and discharge frequency is 9.5KHz.
The present invention has the following advantages compared to existing technology:
Device of the present invention utilizes dielectric barrier discharge plasma electric discharge device, and it has gas and water two media to stop between two metal plate electrodes, is easy to produce low temperature normal atmosphere plasma; Electric discharge working gas is air, can improve plasma oxidation efficiency, and cost-saving; Working electrode is metal plate, can by increase the cross-sectional area of working electrode increase pending containing algae sewage cross-sectional area, thereby improved sewage treating efficiency; Increase insulation agitation means, in discharge process, can stir speed process rate.In addition, in method of the present invention, owing to adding suitable sodium-chlor pending containing in algae sewage, through verification experimental verification, add sodium-chlor can improve the inactivation ratio of frustule, and accelerate algae toxin and discharge in frustule, thereby improve the efficiency of plasma degradation algae toxin.Installation cost of the present invention is low, simple to operation, and processing efficiency is high, does not produce secondary pollution, is suitable for applying on a large scale.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the inactivation ratio temporal evolution schematic diagram of frustule in experiment four of the present invention.
Fig. 3 is the concentration changes with time schematic diagram of algae toxin in experiment four of the present invention.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Referring to Fig. 1, the efficient processing of dielectric barrier discharge plasma that the present embodiment provides, containing the device of algae sewage, comprises the processing water tank 1 of sealing, processes water tank 1 and is made up of insulating material, is chosen as glass water tank.Process water tank 1 inside and be provided with cavity, process water tank 1 top and be provided with inlet mouth 4 and air outlet 5, process water tank 1 one upper lateral parts and be provided with water-in, process water tank 1 one side bottoms and be provided with water outlet, water-in is connected respectively water inlet pipe 2 and rising pipe 3 outward with water outlet, on water inlet pipe 2 and rising pipe 3, is respectively arranged with valve.Device also comprises electric pole plate 6 and lower electrode plate 7, and electric pole plate 6 and lower electrode plate 7 are preferably stainless steel plate.The top that is arranged at the cavity of processing water tank 1 of electric pole plate 6 levels, being arranged under the bottom of processing water tank 1 of lower electrode plate 7 levels, electric pole plate 6 and lower electrode plate 7 are oppositely arranged in vertical direction and are connected respectively on power supply 9, power supply 9 is high-voltage ac power, high-voltage ac power is connected with oscilloscope 10, can observe the indexs such as voltage, electric current, frequency and discharge power by oscilloscope 10.Process in the cavity of water tank 1 for accommodating pending containing algae sewage 20 gapped containing interval between the upper surface of algae sewage and the lower surface of electric pole plate 6 when work in cavity.In addition,, for speed process rate, process water tank 1 one side lower parts and be also provided with the insulation agitation means 8 stretching in cavity.
This device is to utilize dielectric barrier discharge, in its discharge process, between electric pole plate 6 and lower electrode plate 7, there is gas and stop containing algae sewage two media, powered by ac high voltage source, under suitable discharging condition, the light of following in discharge process, heat, the hydroxyl radical free radical of the physical factors such as shockwave and generation, hydrogen peroxide isoreactivity oxygen species, can destroy cytolemma and the cytoplasmic structure of frustule, strong oxidizing property free radical is invaded cell interior, the synergy of multiple damage makes frustule very fast dead, kill frustule and the algae toxin of the frustule release of degrading.
The present embodiment also provides dielectric barrier discharge plasma the efficient method of processing containing algae sewage, and it adopts efficient the processing containing the device of algae sewage of above-mentioned dielectric barrier discharge plasma to process, and comprises the steps:
(1) drop into and process in the cavity of water tank 1 containing algae sewage 20 pending, and add sodium-chlor pending containing in algae sewage 20, pending in cavity is no more than 1cm containing gap between the upper surface of algae sewage 20 and the lower surface of electric pole plate 6;
(2) in from inlet mouth 4 to cavity, pass into air, open insulation agitation means 8 stirs containing algae sewage 20 pending simultaneously, then start power supply 9, between electric pole plate 6 and lower electrode plate 7, start to carry out low temperature normal atmosphere plasma electric discharge, sparking voltage is more than 300V;
(3) in plasma discharge process, sample by water outlet, measure the wherein concentration of frustule and the concentration of algae toxin, thereby obtain the inactivation ratio of different time frustule and the degradation efficiency of algae toxin, meet after sewage disposal index until reach, close power supply 9.
When processing, electric pole plate 6 lower surfaces are less from the pending upper surface distance containing algae sewage 20, and required to apply voltage just less; Electric pole plate 6 lower surfaces are generally no more than 1cm from the pending distance of the upper surface containing algae sewage 20, and voltage of alternating current is more than 300 volts; Can control and regulate discharge time according to processing the water yield and sewage disposal index, can pass through sampling and measuring at any time, judge wherein whether frustule is killed, and whether the content of algae toxin is degraded to below acceptable concentration.
In order to verify the efficient effect of processing containing the method for algae sewage of above-mentioned dielectric barrier discharge plasma, applicant has specially done following experiment.
Experiment one
This experiment is only to testing containing the inactivating efficacy of frustule in algae sewage.In its selected device, processing water tank 1 capacity is 25ml, and the discoidal stainless steel plate that electric pole plate 6 and lower electrode plate 7 are 5cm by diameter is made.In this experiment, the pending starting point concentration containing algae sewage 20 is 1.69*10
7cells/ml, electric discharge liquor capacity 3ml, sparking voltage 400V, electric discharge a-c cycle is 9.5kHZ, received current 1.58-1.80A, the gas flow that passes into air is 0.15L/min.
The experimental result of gained is: the inactivation ratio of the 30 seconds frustules that discharge under air conditions just can reach more than 90%.
Experiment two
This experiment is only tested to the degradation effect of simple algae toxin.Its selected device is with experiment one.In this experiment, choosing algae toxin starting point concentration is 2mg/L, electric discharge liquor capacity 3ml, and sparking voltage 400V, electric discharge a-c cycle is 9.5kHZ, received current 1.85A, the gas flow that passes into air is 0.15L/min.
The experimental result of gained is: under air conditions, the degradation rate of electric discharge degraded algae toxin reaches more than 90% and only needs 30 seconds.
Experiment three
This experiment simultaneously degradation effect of the fire extinguishing effect to frustule and algae toxin is tested.Its selected device is with experiment one.In this experiment, choosing frustule starting point concentration is 1.69*10
7cells/ml, electric discharge liquor capacity 3ml, sparking voltage 400V, electric discharge a-c cycle is 9.5kHZ, electric current 1.58-1.80A passes into the gas flow of air: 0.15L/min.
The experimental result of gained is: the inactivation ratio of the 30 seconds frustules that discharge under air conditions just can reach more than 90%, and the degradation rate of algae toxin degraded reaches more than 90% and takes time 180 seconds.This is because after frustule damage, algae toxin discharges also needs certain hour, along with the increase of discharge time, damaging action strengthens, cell rupture strengthens, and discharges algae toxin and accelerates, and at this moment algae toxin is degraded under the effect of the strong oxidizing condition of plasma body, therefore with respect to the degradation effect of simple inspection algae toxin in experiment two, in this experiment, the degradation rate of algae toxin will reach more than 90% can need time of more growing.
Experiment four
This experiment is to add under the condition of sodium-chlor containing in algae sewage 20 pending, and the degradation effect of the fire extinguishing effect to frustule and algae toxin is tested simultaneously.Its selected device is with experiment one.The starting point concentration of choosing frustule in this experiment is 0.94*10
7cells/ml, adds sodium-chlor pending containing in algae sewage 20, and the molarity of sodium-chlor is 0.2mol/l; Sparking voltage is 400V, electric discharge a-c cycle 9.75KHz, and electric current 1.55A, the gas flow that passes into air is 0.15L/min.
The experimental result of gained, referring to Fig. 2 and Fig. 3, as can be seen from Figures 2 and 3, adds after sodium-chlor, and the degradation rate of the inactivation ratio of frustule and algae toxin all obviously improves.In addition, we show by experiment, add after sodium-chlor the raising the efficiency and the concentration positive correlation that adds sodium-chlor of the degradation rate of the inactivation ratio of frustule and algae toxin.For example, in the time that sodium chloride concentration is 0.2mol/l, frustule inactivation ratio reaches more than 90% needs 60 seconds, and while being 0.05mol/l for sodium chloride concentration, the inactivation ratio of frustule reaches more than 90% needs 120 seconds.
Device of the present invention utilizes the electric discharge device of dielectric barrier discharge plasma, and it has gas and water two media to stop between two metal plate electrodes, is easy to produce low temperature normal atmosphere plasma; Electric discharge working gas is air, can improve plasma oxidation efficiency, and cost-saving; Working electrode is metal plate, can by increase the cross-sectional area of working electrode increase pending containing algae sewage 20 cross-sectional area, thereby improved sewage treating efficiency; Increase insulation agitation means 8, in discharge process, can stir speed process rate.In addition, in method of the present invention, owing to adding suitable sodium-chlor pending containing in algae sewage 20, through verification experimental verification, add sodium-chlor to improve the inactivation ratio of frustule, and accelerate algae toxin and discharge in frustule, thereby improve the efficiency of plasma degradation algae toxin.Installation cost of the present invention is low, simple to operation, and processing efficiency is high, does not produce secondary pollution, is suitable for applying on a large scale.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the efficient device of processing containing algae sewage of dielectric barrier discharge plasma, comprise the processing water tank of sealing, described processing water tank inside is provided with cavity, it is characterized in that: described processing tank top is provided with inlet mouth and air outlet, described processing water tank one upper lateral part is provided with water-in, described processing water tank one side bottom is provided with water outlet, described device also comprises electric pole plate and lower electrode plate, the top of the cavity that is arranged at described processing water tank of described electric pole plate level, under the bottom that is arranged at described processing water tank of described lower electrode plate level, described electric pole plate and lower electrode plate are oppositely arranged in vertical direction and are connected respectively on power supply, the cavity of described processing water tank is interior for accommodating pending containing algae sewage, gapped containing interval between the upper surface of algae sewage and the lower surface of described electric pole plate described in when work in cavity, described processing water tank one side lower part is also provided with the insulation agitation means stretching in described cavity.
2. the efficient device of processing containing algae sewage of dielectric barrier discharge plasma as claimed in claim 1, is characterized in that: described power supply is high-voltage ac power, and described high-voltage ac power is connected with oscilloscope.
3. the efficient device of processing containing algae sewage of dielectric barrier discharge plasma as claimed in claim 1, is characterized in that: described electric pole plate and lower electrode plate are stainless steel plate.
4. the efficient device of processing containing algae sewage of dielectric barrier discharge plasma as claimed in claim 1, is characterized in that: described processing water tank is glass water tank.
5. the efficient device of processing containing algae sewage of dielectric barrier discharge plasma as claimed in claim 1, is characterized in that: described water-in is connected respectively water inlet pipe and rising pipe outward with water outlet, on described water inlet pipe and rising pipe, is respectively arranged with valve.
6. the efficient method of processing containing algae sewage of dielectric barrier discharge plasma, is characterized in that: it adopts efficient the processing containing the device of algae sewage of the arbitrary described dielectric barrier discharge plasma of claim 1 to 5 to process, and comprises the steps:
(1) drop into and process in the cavity of water tank containing algae sewage pending, and add sodium-chlor pending containing in algae sewage, pending in cavity is no more than 1cm containing gap between the upper surface of algae sewage and the lower surface of electric pole plate;
(2) in from inlet mouth to cavity, pass into air, open insulation agitation means stirs containing algae sewage pending simultaneously, then start power supply, start to carry out low temperature normal atmosphere plasma electric discharge between electric pole plate and lower electrode plate, sparking voltage is more than 300V;
(3) in plasma discharge process, sample by water outlet, measure the wherein concentration of frustule and the concentration of algae toxin, thereby obtain the inactivation ratio of different time frustule and the degradation efficiency of algae toxin, meet after sewage disposal index until reach, close power supply.
7. the efficient method of processing containing algae sewage of dielectric barrier discharge plasma as claimed in claim 6, it is characterized in that: in described step (2), the gas flow that passes into air in from inlet mouth to cavity is 0.15L/min, received current is 1.55-1.85A, sparking voltage is 400V, and discharge frequency is 9.5KHz.
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| CN107381722A (en) * | 2017-08-22 | 2017-11-24 | 西安工业大学 | The method for quickly producing a large amount of oxygen activity ions |
| CN108569742A (en) * | 2018-04-29 | 2018-09-25 | 航天慧能（江苏）环境工程有限公司 | Plasma waste water treatment system based on Internet of Things |
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Cited By (10)
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| CN104761008A (en) * | 2015-03-25 | 2015-07-08 | 仲伟伦 | Device for rapidly treating high-concentration waste water and sewage |
| CN106115987A (en) * | 2016-06-30 | 2016-11-16 | 仲伟伦 | Additive-free sewage treatment process and device |
| CN106830203A (en) * | 2017-02-17 | 2017-06-13 | 西安工业大学 | A kind of standard processing method of natural eutrophication water |
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| CN108569742A (en) * | 2018-04-29 | 2018-09-25 | 航天慧能（江苏）环境工程有限公司 | Plasma waste water treatment system based on Internet of Things |
| CN109499283A (en) * | 2018-12-04 | 2019-03-22 | 重庆工商大学 | A kind of pollutant handling arrangement based on dielectric barrier discharge plasma |
| CN114849617A (en) * | 2022-06-08 | 2022-08-05 | 广州大学 | Plasma low-temperature reaction device capable of quickly replacing reaction core and use method |
| CN114849617B (en) * | 2022-06-08 | 2023-11-24 | 广州大学 | Plasma low-temperature reaction device capable of rapidly replacing reaction core and use method |
| CN115448412A (en) * | 2022-09-29 | 2022-12-09 | 中国科学院合肥物质科学研究院 | Method for treating toxic fungi and toxic fungi in water body by adopting plasma jet device |
| CN115448412B (en) * | 2022-09-29 | 2024-03-12 | 中国科学院合肥物质科学研究院 | Method for treating toxic fungi and toxins in water body by adopting plasma jet device |
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