CN1597542A - Method of blow out volatile pollutant in sewage using bifrequency ultra sonic wave - Google Patents
Method of blow out volatile pollutant in sewage using bifrequency ultra sonic wave Download PDFInfo
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- CN1597542A CN1597542A CN 200410024548 CN200410024548A CN1597542A CN 1597542 A CN1597542 A CN 1597542A CN 200410024548 CN200410024548 CN 200410024548 CN 200410024548 A CN200410024548 A CN 200410024548A CN 1597542 A CN1597542 A CN 1597542A
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Abstract
A process for scavenging the volatile pollutants from sewage by dual-frequency ultrasonic waves nicludes such steps as installing ultrasonic transducer to the bottom of a container with open top, emitting two groups of ultrasonic waves at 20-40 Khz and 1.0-3.0m MHz, and flowing the sewage to be treated through said container with the stay time not less than 15 S while scavenging its volatile pollutants by ultrasonic waves.
Description
Technical field:
The present invention relates to a kind of method of purifying liquid waste, particularly a kind of method that adopts ultrasonic wave to remove volatile contaminant in the waste water.
Background technology:
Volatile contaminant is a big class material that extensively is present in chemical industry and the relevant industries waste water, for example, and benzene, chlorobenzene, hydrocarbon, small molecules acid, ammonia etc.This class material enters water body and can pollute, they are the dissolved oxygen in the mass consumption water in biodegradation process, wherein inorganic ammonia and the organic pollutant that contains the ammonia element also can cause the eutrophication of water body, these factors make water hypoxia, can make a large amount of hydrobiont death when serious, and the water quality blackout is smelly, influences water landscape.Volatile contaminant often has necessarily even very strong toxicity, some also has biological accumulation, can not discharge organism through Metabolic activity, and further transmit in biologic chain, the hydrobiont that the mankind drink in this source water or edible this water source also can be caused indirect poisoning.
Have multiple advanced treatment technology to remove these volatile contaminants to purify liquid waste at present, representative technology has charcoal absorption, macroporous resin adsorption, various membrane bioreactor, photochemical catalytic oxidation, air stripping etc.Wherein, gac and macroporous resin adsorption are to rely on physics and the isolating method of chemisorption to remove pollutent, and membrane bioreactor and photochemical catalytic oxidation are to rely on the method for chemistry and bio-oxidation to remove reductive pollutants.But their treatment effect is all undesirable, because operational characteristic separately, the specific aim of removing volatile contaminant is relatively poor.
Air stripping is to rely on the volatilization character of pollutent to make pollutent transfer to gas phase to reach the method for purifying liquid waste from liquid phase.Generally be to be placed with aerating apparatus in the water treating device bottom, the air that blower fan is sent here is dispersed into micro-bubble by aeration head, forms gas-liquid two-phase in the waste water main body, and the volatile contaminant in the waste water is transferred to the gas phase from liquid phase, leaves liquid with bubble and removes.On gas stripping mechanism, the micro-bubble internal pressure is approaching and be a bit larger tham a normal atmosphere, and mass transfer power is less; The aeration less turbulence is little simultaneously, and resistance to mass transfer is bigger, therefore, is unfavorable from this technology of mass transfer dynamics angle.According to the vapor liquid equilibrium theory, the equilibrium concentration that pollutent is transferred to bubble is lower in addition, so stripping speed and efficient are not high.
Also having a kind of treatment process in addition is to utilize the hyperacoustic cavitation effect of single-frequency.In being 02148455.4 patent of invention " method of volatile contaminant in the ultrasonic wave stripping waste water ", application number related to this method.When ultrasonic wave during at water transmission, because the ultrasonic cavitation effect produces many cavitation bubbles, cavitation bubble has generation, expansion, compression and a process of collapse.The cavitation bubble collapse time has the above high temperature of 5000K and 400 high pressure that normal atmosphere is above, and is accompanied by the microjet that intensive shockwave and speed are higher than 100km/h.The formation of cavitation bubble makes the aqueous solution become gas one liquid two-phase system by single liquid phase transition.Cavitation bubble produces the initial stage, and the bubble internal pressure is near vacuum, and water becomes water vapor and enters cavitation bubble, meanwhile, is dissolved in volatile contaminant in the water and also passes the gas-liquid two-phase interface rapidly and enter cavitation bubble and become gas.On aqueous solution surface, the volatile contaminant of cavitation bubble inside is along with the collapse of cavitation bubble and the shockwave disengaging aqueous solution main body of generation thereof enter air.Under the ultrasonic wave effect, cavitation bubble is constantly collapse and generation on aqueous solution surface, and like this, the volatile contaminant that is dissolved in the water constantly breaks away from the air that the aqueous solution enters the liquid level top, and strength of solution constantly reduces.Because pressure in bubbles is much lower in the pressure ratio air stripping technology in the cavitation bubble, volatile matter is transferred to the equilibrium concentration and the speed of bubble and is wanted high, so stripping speed and efficient are also high.
Ultrasonic stripping efficient is based on the power of ultrasonic cavitation effect, but the cavitation effect of single ultrasonic frequency a little less than, thereby it is comparatively limited that stripping efficient is improved, energy consumption is relatively large, especially cost costliness when handling low concentration wastewater.
Summary of the invention:
The present invention is exactly on the basis that utilizes the ultrasonic cavitation effect, provides a kind of efficient, practical, economic dual-frequency ultrasonic wave to strengthen the method for volatile contaminant in the stripping waste water.
Technical scheme of the present invention is as follows:
A., the processing vessel of top opening is set, and at this container inner bottom part ultrasonic transducer is set, send the ultrasonic wave of two groups of different frequencies, formation has synergistic dual-frequency ultrasonic wave.Two groups of frequency of ultrasonic are controlled at 20-40KHz and two height sections of 1.0-3.0MHz respectively, and the sound intensity is controlled at 0.1-2.0W/cm respectively
2And 0.1-1.0W/cm
2
B. the waste water with required processing passes through from said vesse, and its hydraulic detention time is no less than 15 seconds, makes volatile contaminant in the waste water by the ultrasonic wave stripping, finishes the purifying treatment of waste water.
The ultrasonic transducer of processing vessel inner bottom part setting is divided into two groups of low-and high-frequency, according to the size of processing vessel, and every group of quantity or be one, or be a plurality of.Every group when a plurality of ultrasonic transducer is arranged, the cross arrangement of low-and high-frequency transverter.
Innovation part of the present invention has been to use the two kinds of cavitation effect that ultrasonic wave caused synergies that frequency is different, therefore can strengthen the ultrasonic stripping effect.Under the double-frequency ultrasound effect, produce cavitation processes separately, when cavitation bubble implosion separately, can produce many new cavitation nucleus.Because the frequency of two kinds of sound waves is different with phase place, self cavitation again that these cavitation nucleus have not only been kept this frequency also can provide more cavitation nucleus for the cavitation of another frequency simultaneously, thereby produce more cavitation bubble separately, has strengthened cavitation effect mutually.It is also much bigger that cavitation effect under the double-frequency ultrasound condition in the water is generally the ultrasonic sum of single-frequency, thereby make dual-frequency ultrasonic wave have the obvious synergistic effect.Ultrasonic stripping efficient is based on the power of cavitation effect, so the dual-frequency ultrasonic wave stripping process that obviously volatility is polluted in the fortified water.Utilizing this method can obtain higher stripping efficient, reduce energy consumption, is the method for volatile contaminant in a kind of efficient, practical, economic stripping waste water, has great promotional value.
Embodiment:
Among the present invention, to the reinforcement stripping effect of volatile contaminant mainly based on the collaborative cavitation effect of dual-frequency ultrasonic wave.Stripping device of the present invention can adopt the cuboid container, no loam cake, and waste water enters from container one end by pipeline, flows out from the other end, and the volume of stripping container is changeable according to handling the water yield.The concentration and the physico-chemical property of the solvability organic pollutant in the residence time of waste water in container and the waste water are relevant, and volatile performance is big more, and the stripping effect is good more.Concentration is low more, and the residence time is few more.
Example 1:
For the trade effluent that mainly contains the chlorobenzene class, be that 20KHz, the sound intensity are 2.0W/cm a frequency
2Ultrasonic wave and a frequency be that 3.0MHz, the sound intensity are 1.0W/cm
2Hyperacoustic synergy under, the surface-area of processing vessel opening is 2: 1 with the ratio of the sectional area of the vertical current of processing vessel, during hydraulic detention time 30s, chlorobenzene stripping rate reaches more than 50%; During hydraulic detention time 3min, chlorobenzene stripping rate reaches more than 90%; During hydraulic detention time 8min, chlorobenzene is basically fully by stripping.
Example 2:
For the tap water that mainly contains disinfection byproduct (DBP) such as hydrochloric ether etc., be that 30KHz, the sound intensity are 1.0W/cm a frequency
2Ultrasonic wave and a frequency be that 1.5MHz, the sound intensity are 1.0W/cm
2Hyperacoustic synergy under, the surface-area of processing vessel opening is 3: 1 with the ratio of the sectional area of the vertical current of processing vessel, during hydraulic detention time 2min, hydrochloric ether stripping rate reaches more than 95%; During hydraulic detention time 5min, chlorobenzene is basically fully by stripping.
Example 3:
For the sanitary sewage tail water that mainly contains ammonia-state nitrogen, be that 40KHz, the sound intensity are 0.5W/cm a frequency
2Ultrasonic wave and a frequency be that 1.0MHz, the sound intensity are 0.2W/cm
2Hyperacoustic synergy under, the surface-area of processing vessel opening is 1: 1 with the ratio of the sectional area of the vertical current of processing vessel, during hydraulic detention time 4min, ammonia-state nitrogen stripping rate reaches more than 95%; During hydraulic detention time 10min, ammonia-state nitrogen is basically fully by stripping.
Example 4:
For the food wastewater that mainly contains small molecular alcohol such as ethanol etc., be that 20KHz, the sound intensity are 0.1W/cm a frequency
2Ultrasonic wave and a frequency be that 1.0MHz, the sound intensity are 0.3W/cm
2Hyperacoustic synergy under, the surface-area of processing vessel opening is 3: 1 with the ratio of the sectional area of the vertical current of processing vessel, during hydraulic detention time 4min, ethanol stripping rate reaches more than 95%; During hydraulic detention time 10min, ethanol is basically fully by stripping.
Example 5:
For the trade effluent that mainly contains arene such as toluene etc., be that 40KHz, the sound intensity are 1.5W/cm a frequency
2Ultrasonic wave and a frequency be that 3.0MHz, the sound intensity are 0.1W/cm
2Hyperacoustic synergy under, the surface-area of processing vessel opening is 1: 1 with the ratio of the sectional area of the vertical current of processing vessel, during hydraulic detention time 2min, toluene stripping rate reaches more than 95%; During hydraulic detention time 5min, toluene is basically fully by stripping.
Claims (3)
1, the method for volatile contaminant in a kind of dual-frequency ultrasonic wave stripping waste water is characterized in that its employing following steps:
A., the processing vessel of top opening is set, and ultrasonic transducer is set at this container inner bottom part, send the ultrasonic wave of two groups of different frequencies, two groups of frequency of ultrasonic are controlled at 20-40KHz and two height sections of 1.0-3.0MHz respectively, and the sound intensity is controlled at 0.1-2.0W/cm respectively
2And 0.1-1.0W/cm
2
B. the waste water with required processing passes through from said vesse, and its hydraulic detention time is no less than 15 seconds, makes volatile contaminant in the waste water by the ultrasonic wave stripping, finishes the purifying treatment of waste water.
2, the method for volatile contaminant in the dual-frequency ultrasonic wave stripping waste water according to claim 1, it is characterized in that: the ultrasonic transducer in the setting of described processing vessel inner bottom part is divided into two groups of low-and high-frequency, every group of quantity or be one, or be a plurality of.
3, the method for volatile contaminant in the dual-frequency ultrasonic wave stripping waste water according to claim 2 is characterized in that: a plurality of ultrasonic transducer cross arrangements of every group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410024548 CN1597542A (en) | 2004-08-12 | 2004-08-12 | Method of blow out volatile pollutant in sewage using bifrequency ultra sonic wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410024548 CN1597542A (en) | 2004-08-12 | 2004-08-12 | Method of blow out volatile pollutant in sewage using bifrequency ultra sonic wave |
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| CN1597542A true CN1597542A (en) | 2005-03-23 |
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| CN 200410024548 Pending CN1597542A (en) | 2004-08-12 | 2004-08-12 | Method of blow out volatile pollutant in sewage using bifrequency ultra sonic wave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935087A (en) * | 2010-08-16 | 2011-01-05 | 合肥工业大学 | Double-frequency ultrasonic chemical reactor |
| CN103238765A (en) * | 2013-05-13 | 2013-08-14 | 朱蕾 | Food purifying system with dual-frequency ultrasonic system and hydroxyl radical generator |
| CN106477667A (en) * | 2016-12-07 | 2017-03-08 | 南京航空航天大学 | A kind of method and device for going chlorine residue in eliminating water based on ultrasound |
-
2004
- 2004-08-12 CN CN 200410024548 patent/CN1597542A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935087A (en) * | 2010-08-16 | 2011-01-05 | 合肥工业大学 | Double-frequency ultrasonic chemical reactor |
| CN103238765A (en) * | 2013-05-13 | 2013-08-14 | 朱蕾 | Food purifying system with dual-frequency ultrasonic system and hydroxyl radical generator |
| CN106477667A (en) * | 2016-12-07 | 2017-03-08 | 南京航空航天大学 | A kind of method and device for going chlorine residue in eliminating water based on ultrasound |
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