CN111960523A - Method and device for realizing gas-water mixing and activating through secondary hydrodynamic cavitation and ultrasonic cavitation - Google Patents
Method and device for realizing gas-water mixing and activating through secondary hydrodynamic cavitation and ultrasonic cavitation Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims description 19
- 230000003213 activating effect Effects 0.000 title abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 87
- 239000002351 wastewater Substances 0.000 claims abstract description 84
- 230000003647 oxidation Effects 0.000 claims abstract description 82
- 230000003197 catalytic effect Effects 0.000 claims abstract description 76
- 239000007788 liquid Substances 0.000 claims abstract description 57
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003054 catalyst Substances 0.000 claims abstract description 22
- 230000004913 activation Effects 0.000 claims abstract description 20
- 238000012856 packing Methods 0.000 claims abstract description 19
- 230000003068 static effect Effects 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
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- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000008358 core component Substances 0.000 abstract description 2
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- 239000002101 nanobubble Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000012668 chain scission Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000006385 ozonation reaction Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
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- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to a device for realizing gas-water mixing and activating by secondary hydrodynamic cavitation and ultrasonic cavitation, which comprises: an ultrasonic, hydrodynamic cavitation and catalytic oxidation device, a hydrodynamic cavitation and catalytic oxidation device and a hydrodynamic cavitation device; the ultrasonic, hydrodynamic cavitation and catalytic oxidation type device comprises: a waste water pump, an ultrasonic cavitator, a power supply, a primary high-speed ejector, a circulating pump and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing area, and the upper part of the catalytic oxidation tower is a catalyst packing area. The invention has the beneficial effects that: the device adopted by the invention is a preposed device of the reactor for advanced oxidation treatment of wastewater, can be combined with advanced oxidation reaction main equipment into a whole as a link of the main equipment, and can also be independently used as a preposed device for preposed gas-liquid mixing, ozone dissolution, hydrodynamic cavitation (activation energy) and uniform water distribution when the wastewater is subjected to ozone catalytic oxidation, thereby being a core component for ensuring the treatment effect of the wastewater ozone catalytic oxidation reactor.
Description
Technical Field
The invention belongs to the field of environmental catalysis, and particularly relates to a method and a device for realizing gas-water mixing and activating through secondary hydrodynamic cavitation and ultrasonic cavitation.
Background
The effect of advanced oxidation, such as catalytic ozonation, of organic wastewater depends on the solubility of ozone in water and the amount of ozone decomposed into free radicals, so that the solubility of ozone in water needs to be improved and ensured, and in order to ensure the effect of catalytic ozonation of organic wastewater, the links of sufficient mixing and dissolution of gas and liquid and energy activation of ozone in inlet water are very important.
The ozone catalytic oxidation method is one of advanced oxidation, and is based on that ozone and water generate hydroxyl radicals under the action of a catalyst, and the oxidation-reduction potential of the hydroxyl radicals is very high, so that the aromatic hydrocarbon organic matters can be degraded in an open loop manner; secondly, if jet flow can be passed through in the premixing process and hydrodynamic cavitation is carried out on the wastewater, ozone and water can be further enabled to generate more superoxide radicals and hydroxyl radicals, so that the method is beneficial to carrying out chain pre-breaking and pre-oxidation treatment on the organic wastewater in the premixing section, and lays a foundation for providing favorable conditions for subsequent catalytic oxidation of the rear end of the organic wastewater until the organic wastewater is completely mineralized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method and a device for realizing gas-water mixing and activating through secondary hydrodynamic cavitation and ultrasonic cavitation.
The device for realizing gas-water mixing and activating by secondary hydrodynamic cavitation and ultrasonic cavitation comprises: ultrasonic, hydrodynamic cavitation and catalytic oxidation devices and hydrodynamic cavitation devices.
Preferably, the ultrasonic + hydrodynamic cavitation + catalytic oxidation type device comprises: a waste water pump, an ultrasonic cavitator, a power supply, a primary high-speed ejector, a circulating pump and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone, and the upper part of the catalytic oxidation tower is a catalyst packing zone; the upper part of the gas-liquid mixing zone is provided with a water inlet chamber, the wastewater pump is connected with an inlet pipeline of the ultrasonic cavitator, an outlet pipeline of the ultrasonic cavitator is connected with the gas-liquid mixing zone, a wastewater outlet of the gas-liquid mixing zone is connected with an inlet of the circulating booster pump, an outlet of the circulating booster pump is connected with an inlet of the primary high-speed ejector, and an outlet of the primary high-speed ejector is connected with the water inlet chamber of the gas-liquid mixing zone; the water inlet chamber of the gas-liquid mixing zone is cylindrical, and a plurality of groups of secondary jet nozzles are arranged in the tangential direction (clockwise or anticlockwise) of the circumference of the water inlet chamber, so that secondary jet cavitation and fluid rotational flow of fluid are realized; the secondary jet nozzle is connected to the outlet of the pipeline of the ultrasonic cavitator, and the inlet of the pipeline of the ultrasonic cavitator is connected to the waste water pump; a separation section (an ozone catalytic oxidation fixed bed) is arranged between the water inlet chamber and the catalyst packing area, and a water distributor is arranged on the separation section; the two primary high-speed ejectors are symmetrically arranged around the catalytic oxidation tower, the catalyst packing area is cylindrical, a plurality of groups of secondary jet nozzles are arranged in the tangential direction (clockwise or anticlockwise) of the circumference of the catalyst packing area, inlets of all secondary jet nozzles arranged in the tangential direction (clockwise or anticlockwise) of the circumference of the catalyst packing area are connected into outlets of the two primary high-speed ejectors, inlets of the two primary high-speed ejectors are connected into an outlet of a circulating booster pump, inlets of the circulating booster pump are connected into an outlet pipeline of an ultrasonic cavitator, and an inlet pipeline of the ultrasonic cavitator is connected into a waste water pump.
Preferably, the hydrodynamic cavitation + catalytic oxidation type device comprises: the system comprises a waste water pump, a circulating booster pump, a main ejector, a static mixer, an auxiliary ejector and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone, and the upper part of the catalytic oxidation tower is a catalyst packing zone; a separation section is arranged between the catalyst packing area and the gas-liquid mixing area, and a water distributor is arranged on the separation section; a branch is divided from a water supply pipeline at the outlet of the waste water pump, a circulating booster pump is additionally arranged on the branch, the outlet of the booster pump is connected with a main ejector, a static mixer is arranged on the main pipeline of the water supply pipeline at the outlet of the waste water pump, and an outlet pipeline of the static mixer is connected into a catalytic oxidation tower; and a wastewater outlet of the gas-liquid mixing zone is connected with an inlet of the circulating booster pump, an outlet of the circulating booster pump is connected with an inlet of the auxiliary ejector, and an outlet of the auxiliary ejector is connected with a water inlet chamber of the gas-liquid mixing zone.
Preferably, the hydrodynamic cavitation type device includes: a waste water pump, a circulating booster pump, a main ejector, a static mixer and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone, and the upper part of the catalytic oxidation tower is a catalyst packing zone; a separation section is arranged between the catalyst packing area and the gas-liquid mixing area, and a water distributor is arranged on the separation section; a branch is divided from a wastewater pump outlet water supply pipeline, a circulating booster pump is additionally arranged on the branch, the outlet of the booster pump is connected with a main ejector, a static mixer is arranged on the main pipeline of the wastewater pump outlet water supply pipeline, and the outlet pipeline of the static mixer is connected into a catalytic oxidation tower.
Preferably, the ultrasonic cavitators are connected with a power supply, the ultrasonic cavitators are a plurality of combined ultrasonic sources, the combination and the input power of the ultrasonic sources can be adjusted according to the wastewater quantity and the intake COD equivalent, and the input number and the input power of the ultrasonic sources can be adjusted according to the intake quantity and the COD so as to meet the requirements of the targets of pretreatment, oxidation chain scission and degradation.
Preferably, the separation section is in a form that a trapezoidal winding dead water cap is arranged on a porous plate, so that uniform water distribution of water discharged from the mixing chamber is ensured, bias flow of fluid is prevented, and loss of catalytic filler is avoided.
The working method of the device for realizing gas-water mixing and activating through secondary hydrodynamic cavitation and ultrasonic cavitation comprises the following steps:
step 1, when treating equipment with large flow and high required gas/liquid ratio, selecting an ultrasonic, hydrodynamic cavitation and catalytic oxidation device: the ultrasonic cavitator is arranged at the jet flow return section of the water inlet pipeline and is a plurality of combined ultrasonic sources, and the combination and input power of the ultrasonic sources can be adjusted according to the wastewater quantity and the COD equivalent of inlet water; an ultrasonic cavitator is also arranged in a water inlet chamber of the gas-liquid mixing area, and the input number and input power of an ultrasonic source can be adjusted according to water inlet amount and COD (chemical oxygen demand) so as to meet the requirements of the targets of pretreatment, oxidation, chain scission and degradation; the wastewater sequentially passes through a circulating booster pump and a primary high-speed ejector, is mixed with ozone for the first time, and forms hydrodynamic cavitation at an outlet nozzle of the primary high-speed ejector; the mixture of the wastewater and the ozone is sucked into the surrounding wastewater again and mixed after entering a secondary jet nozzle in a water inlet chamber of the gas-liquid mixing area, and secondary hydrodynamic cavitation is formed;
step 2, when equipment with medium flow, low COD concentration and small gas/liquid ratio is treated, selecting a hydrodynamic cavitation and catalytic oxidation type device: the method comprises the following steps that a bypass pipeline is arranged on a water inlet main pipeline, a circulating booster pump and a main ejector are additionally arranged, waste water of the bypass is added with jet flow through the main ejector for one time and then returns to the water inlet main pipeline in two ways, the waste water is symmetrically arranged on two sides of the water inlet main pipeline, and a stirring chain type static mixer is arranged on the water inlet main pipeline; connecting a waste water outlet of the gas-liquid mixing area to an inlet of a circulating booster pump, connecting an outlet of the circulating booster pump to an inlet of an auxiliary ejector, and connecting an outlet of the auxiliary ejector to a water inlet chamber of the gas-liquid mixing area;
and 3, when the equipment with large and medium flow, high COD and high COD removal capacity and medium gas/liquid ratio is treated, because more ozone reactions are needed, a hydrodynamic cavitation type device is selected, a bypass pipeline is arranged on the water inlet main pipeline, a circulating booster pump and a main ejector are additionally arranged on the bypass, the waste water of the bypass returns to the water inlet main pipeline in two ways after being subjected to primary jet flow increase by the main ejector, and is symmetrically arranged on two sides of the water inlet main pipeline, and a static mixer in a stirring chain type is arranged on the water inlet main pipeline, so that the equipment can adapt to the waste water treatment with higher COD, meet the requirement of higher ozone suction capacity, and meet the requirement of ozone suction capacity which can not be met by jet flow in any single form.
Preferably, the number and specification of the primary high-speed ejectors in the step 1 are determined according to the amount of treated water:
when the wastewater treatment capacity is small, the number of the primary high-speed ejectors is set to be one, the outlet nozzles of the primary high-speed ejectors are divided into two paths of water to symmetrically enter a gas-liquid mixing area, and secondary jet flow nozzles are arranged in the tangential direction of the circumference of the cylindrical water inlet chamber; the number of the secondary jet flow nozzles is designed according to the incident flow;
when the treated water amount of the wastewater is larger, the number of the primary high-speed ejectors is two, outlet nozzles of each primary high-speed ejector are symmetrically distributed into a gas-liquid mixing area by two paths of water outlet, and secondary jet nozzles are arranged in the tangential direction of the circumference at the position where the outlet nozzles enter the gas-liquid mixing area; the number of secondary jet nozzles is designed according to the incident flow.
Preferably, in the step 1, the gas-liquid mixing zone is arranged in the water inlet chamber: if the two groups of secondary jet flow nozzles are arranged in a hedging way, if the four groups of secondary jet flow nozzles are arranged in a tangential direction (clockwise or anticlockwise) along the circumference of the water inlet chamber, the jet flow fluid is ensured to form a rotational flow to drive the water inlet to be mechanically stirred, and the effect of strengthening mixed mass transfer is achieved.
The invention has the beneficial effects that:
1) the device adopted by the invention is a preposed device of the reactor for advanced oxidation treatment of wastewater, can be combined with advanced oxidation reaction main equipment into a whole as a link of the main equipment, and can also be independently used as a preposed device for preposed gas-liquid mixing, ozone dissolution, hydrodynamic cavitation (activation energy) and uniform water distribution when the wastewater is subjected to ozone catalytic oxidation, thereby being a core component for ensuring the treatment effect of the wastewater ozone catalytic oxidation reactor.
2) The invention discloses a method and a device for realizing gas-liquid premixing, dissolution and initial activation through combination or independent of hydrodynamic cavitation and ultrasonic cavitation, which lay a favorable foundation for subsequent ozone heterogeneous catalytic oxidation degradation of organic matters; the invention carries out process combination according to different ozone demands and based on the most energy-saving mode, improves the ozone utilization rate and the cavitation activation degree to the maximum extent, and creates conditions for catalytic oxidation degradation of organic matters.
Drawings
FIG. 1 is a schematic diagram of an ultrasonic + hydrodynamic cavitation + catalytic oxidation type apparatus;
FIG. 2 is a schematic diagram of a hydrodynamic cavitation + catalytic oxidation type apparatus;
FIG. 3 is a schematic diagram of a hydrodynamic cavitation type apparatus.
FIG. 4 is a flow chart of catalytic oxidation reaction of ozone.
Description of reference numerals: the device comprises a waste water pump 1, an ultrasonic cavitator 2, a power supply 3, a catalyst filler zone 4, a water distributor 5, a gas-liquid mixing zone 6, a primary high-speed ejector 7, a secondary jet nozzle 8, a circulating booster pump 9, a main jet device 10, a static mixer 11 and an auxiliary jet device 12.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
The invention relates to a device for fully mixing, dissolving and external field activation (hydrodynamic cavitation and ultrasonic cavitation) of ozone gas and wastewater, which comprises a jet device with two-phase flow (gas phase and liquid phase), a vortex intensified mixing nozzle (secondary jet nozzle), a water inlet ultrasonic transducer (ultrasonic cavitator), a circulating booster pump, a tangential arrangement of an incident nozzle and a uniform water distribution device (water distributor 5) at the bottom of an ozone catalytic oxidation fixed bed, and aims to dissolve gaseous ozone into wastewater in micro-nano bubbles through the hydrodynamic cavitation of the jet device and the intensified mixed cavitation of the secondary jet nozzle to the maximum extent, and generate ultra-oxygen free radicals and hydroxyl free radicals by accumulating and then blasting the energy of the micro-nano bubbles under the action of hydrodynamic cavitation and ultrasonic cavitation to initiate chain reaction and pre-oxidize and break chains of macromolecules of organic pollutants in the wastewater, provides conditions for further degrading organic matters and completely mineralizing by subsequent catalytic oxidation. The device can be arranged at the water inlet section of the catalytic oxidation tower, and also can be independently arranged at the front end of the catalytic oxidation tower as independent equipment. After gas and liquid are mixed, the mixture is uniformly distributed outside the catalytic oxidation tower, or a water inlet section of a re-catalytic oxidation tower, such as a mixing zone at the bottom of a reaction fixed bed, is uniformly mixed with sewage inlet water subjected to ultrasonic irradiation by a water inlet pump due to the cavitation action of a jet device, and then external field (ultrasonic) activation is carried out in the mixing zone to generate more free radicals, and a screen is arranged at the upper part of the mixing zone to uniformly distribute water so as to ensure that the gas and water inlet of the fixed bed is uniformly distributed without bias flow.
The invention comprises two methods and process combinations of gas-liquid pre-mixing and dissolving corresponding to the requirements of different treatment capacities and different water inlet organic wastewater concentrations. The COD content of the organic wastewater with different concentrations is different, when the degradation is carried out by adopting the ozone heterogeneous catalytic oxidation, the treatment amount is different, the water outlet requirement is different, the required ozone amount is different, and the oxygen amount pumped by the ejector is matched with a booster pump. The pretreatment before the catalytic oxidation treatment of the ozone can effectively improve the treatment effect of the subsequent catalytic oxidation of the ozone. The catalytic oxidation of ozone in waste water containing macromolecular aromatic hydrocarbon organic matter can break the chain into low molecular organic matter, and is mainly based on that ozone and water generate hydroxyl radical under the action of catalyst, so as to initiate a series of chain reaction.
As an example, the method of the invention adopts three different hydrodynamic cavitation modes (an ultrasonic cavitation + hydrodynamic cavitation + catalytic oxidation device in figure 1, a hydrodynamic cavitation + catalytic oxidation device in figure 2 and a hydrodynamic cavitation device in figure 3) and combines with the ultrasonic cavitation to fully mix and dissolve the ozone and activate the ozone through cavitation, so that the macromolecular chains of the organic matters in the wastewater are subjected to preliminary activation and fracture before the catalytic degradation of the ozone.
The first is to treat the large flow rate, about 80-110 m3The ozone heterogeneous catalytic oxidation tower has high COD in the inlet water to be treated (about 1000mg/L or more), and the COD in the outlet water after the treatment of the waste water is required to be at least below 500 mg/L. See figure 1 for details. The ozone and wastewater pre-mixing and pre-activating ultrasonic and hydrodynamic cavitation process combination has two types, wherein the type I is shown in figure 1(a) and figure 1(b), and the type II is shown in figure 1 (c).
FIG. 1(a) and FIG. 1(b) represent type one, the type one is that a wastewater pump pumps wastewater into a pipeline which is provided with a plurality of groups of ultrasonic transducers with the same frequency and adjustable power for ultrasonic cavitation, so that the influent water generates a certain amount of free radicals (hydroxyl free radicals) to activate macromolecular organic matters in the wastewater under the action of the ultrasonic cavitation, the wastewater then enters a mixing zone of a catalytic oxidation tower to be fully mixed with a gas-liquid mixture of ozone and wastewater sucked by hydraulic secondary cavitation of an ejector, part of the wastewater in the mixing zone is subjected to the hydraulic cavitation of a circulating booster pump and the ejector to realize primary mixing, dissolution and cavitation (activation) of the wastewater and ozone gas, and after the wastewater is sprayed into a water inlet chamber of the catalytic oxidation tower, incident nozzles are arranged along the tangential direction (clockwise or counterclockwise) on the upper circumference of a cylindrical mixing device to realize secondary cavitation and fluid swirling, ozone is fully mixed, dissolved and re-cavitated (activated) in the wastewater, during the process, energy accumulated and exploded due to hydrodynamic cavitation causes hydrogen free radicals, hydroxyl free radicals and the like generated by the breakage of water molecule bonding bonds, H2O < - >, H < + >, OH, O3 < - >, O < + > O2 carry out primary oxidative degradation on organic pollutants in water, and then fully mixed gas-liquid fluid enters a catalytic filler layer of a catalytic oxidation tower through a porous plate water cap to carry out catalytic oxidation reaction of the ozone, as shown in detail in figure 4;
the device comprises a jet device (a primary high-speed jet device) with two-phase flow (gas phase and liquid phase), a vortex intensified mixing nozzle (a secondary jet nozzle), an inflow ultrasonic transducer, a circulating booster pump and a bottom uniform water distribution device of an ozone catalytic oxidation fixed bed, and aims to dissolve gaseous ozone in waste water in the form of micro-nano bubbles through the hydrodynamic cavitation action of the jet device and the intensified mixing and secondary cavitation action of the secondary nozzle to the maximum extent, the gas-liquid mixture is uniformly outside a catalytic oxidation reaction tank, a water inlet section of a re-reaction tank (a water inlet section of the catalytic oxidation tower) can also be arranged, such as a mixing area at the bottom of the reaction fixed bed, and the gaseous ozone and the waste water subjected to ultrasonic irradiation by a water inlet pump are uniformly mixed due to the cavitation action of the jet device, and then external field (ultrasonic cavitation) activation is carried out in the mixing area to generate more free radicals, the upper part is provided with a screen (a perforated plate is provided with a water cap) for uniform water distribution, so as to ensure that the air water of the fixed bed is uniformly distributed without bias flow.
The second type is directed to the large treatment flow, about 110m3/h, see fig. 1(c), and is more suitable for the oxidation tower with larger diameter. When the diameter of the oxidation tower is large, in order to ensure that the gas-water mixture discharged from the ejector is sprayed into the oxidation tower to distribute water uniformly, a circulating booster pump is adopted for two water ejectors which are symmetrically arranged around the oxidation tower, and tangential incidence is adopted after the water ejectors enter the oxidation tower, so that the water flow in a mixing area forms a rotational flow which is in an internal rotational flow stirring state, further the uniform mixing with the inlet water is strengthened, and the hydrodynamic cavitation is used for carrying out primary activation and chain breaking on macromolecular organic matters in the wastewater.
The second is directed at the energy-saving hydrodynamic cavitation premixing, dissolving and activating device with medium treatment capacity, as shown in fig. 2 and fig. 3, the treatment flow is about 60-80 m3/h, the COD fluctuation of inlet water is large, and the COD removal also fluctuates. The ozone suction amount is adjusted according to the water inlet COD, the process shown in figure 2 is that a branch is divided from a water supply pipeline at the outlet of a wastewater inlet pump, a pipeline booster pump is additionally arranged on the branch, an ejector is connected to the outlet of the booster pump, ozone is sucked from the ejector and mixed with wastewater, then the ozone returns to a main wastewater pipeline through a pipeline static mixer arranged on the water supply main pipeline to be uniformly mixed with the main wastewater, the ozone and the wastewater can be uniformly mixed with the main pipeline wastewater with a large diameter, and then the ozone and the wastewater enter an oxidation tower together. The two ejectors can be operated simultaneously or singly, and completely depend on the inflow water quantity and the inflow COD concentration, when the two ejectors are both large, the ozone demand is large, the two ejectors are fully opened, and when the ozone demand is small, one ejector is independently operated, so that the energy-saving operation mode is realized.
Fig. 3 only cancels jet suction of the circulating pressurization part in fig. 2, is suitable for ozone suction amount with low COD and retains an ejector of a main loop bypass, and can also cancel the ejector of the main loop bypass and retain the ejector of the circulating pressurization part.
Claims (9)
1. The utility model provides a device that realizes air water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation which characterized in that includes: ultrasonic, hydrodynamic cavitation and catalytic oxidation devices and hydrodynamic cavitation devices.
2. The device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation according to claim 1, which is characterized in that: the ultrasonic, hydrodynamic cavitation and catalytic oxidation type device comprises: the device comprises a waste water pump (1), an ultrasonic cavitator (2), a power supply (3), a primary high-speed ejector (7), a circulating pump (9) and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone (6), and the upper part of the catalytic oxidation tower is a catalyst packing zone (4);
a water inlet chamber is arranged at the upper part of the gas-liquid mixing zone (6), the waste water pump (1) is connected with an inlet pipeline of the ultrasonic cavitator (2), an outlet pipeline of the ultrasonic cavitator (2) is connected with the gas-liquid mixing zone (6), a waste water outlet of the gas-liquid mixing zone (6) is connected with an inlet of a circulating booster pump (9), an outlet of the circulating booster pump (9) is connected with an inlet of a primary high-speed ejector (7), and an outlet of the primary high-speed ejector (7) is connected with the water inlet chamber of the gas-liquid mixing zone (6); a water inlet chamber of the gas-liquid mixing area (6) is cylindrical, and a plurality of groups of secondary jet nozzles (8) are arranged in the tangential direction of the circumference of the water inlet chamber; the secondary jet nozzle (8) is connected to the pipeline outlet of the ultrasonic cavitator (2), and the pipeline inlet of the ultrasonic cavitator (2) is connected to the waste water pump (1);
a separation section is arranged between the water inlet chamber and the catalyst packing area (4), and a water distributor (5) is arranged on the separation section; two primary high-speed ejectors (7) are symmetrically arranged around a catalytic oxidation tower, a catalyst packing area (4) is cylindrical, a plurality of groups of secondary jet nozzles (8) are arranged in the tangential direction of the circumference of the catalyst packing area (4), inlets of all secondary jet nozzles (8) arranged in the tangential direction of the circumference of the catalyst packing area (4) are respectively connected into outlets of the two primary high-speed ejectors (7), inlets of the two primary high-speed ejectors (7) are respectively connected into an outlet of a circulating booster pump (9), an inlet of the circulating booster pump (9) is connected into an outlet pipeline of an ultrasonic cavitator (2), and an inlet pipeline of the ultrasonic cavitator (2) is connected into a waste water pump (1).
3. The apparatus for gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1, wherein said hydrodynamic cavitation + catalytic oxidation type apparatus comprises: the system comprises a waste water pump (1), a circulating booster pump (9), a main ejector (10), a static mixer (11), an auxiliary ejector (12) and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone (6), and the upper part of the catalytic oxidation tower is a catalyst packing zone (4); a separation section is arranged between the catalyst packing area (4) and the gas-liquid mixing area (6), and a water distributor (5) is arranged on the separation section; a branch is divided from a water supply pipeline at the outlet of the wastewater pump (1), a circulating booster pump (9) is additionally arranged on the branch, the outlet of the booster pump is connected with a main ejector (10), a static mixer (11) is arranged on the main pipeline of the water supply pipeline at the outlet of the wastewater pump (1), and an outlet pipeline of the static mixer (11) is connected into a catalytic oxidation tower; a wastewater outlet of the gas-liquid mixing area (6) is connected with an inlet of a circulating booster pump (9), an outlet of the circulating booster pump (9) is connected with an inlet of an auxiliary ejector (12), and an outlet of the auxiliary ejector (12) is connected with a water inlet chamber of the gas-liquid mixing area (6).
4. The apparatus for gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1, wherein the hydrodynamic cavitation type apparatus comprises: the system comprises a waste water pump (1), a circulating booster pump (9), a main ejector (10), a static mixer (11) and a catalytic oxidation tower; the lower part of the catalytic oxidation tower is a gas-liquid mixing zone (6), and the upper part of the catalytic oxidation tower is a catalyst packing zone (4); a separation section is arranged between the catalyst packing area (4) and the gas-liquid mixing area (6), and a water distributor (5) is arranged on the separation section; a branch is divided from an outlet water supply pipeline of the waste water pump (1), a circulating booster pump (9) is additionally arranged on the branch, an outlet of the booster pump is connected with a main ejector (10), a static mixer (11) is arranged on the main pipeline of the outlet water supply pipeline of the waste water pump (1), and an outlet pipeline of the static mixer (11) is connected into the catalytic oxidation tower.
5. The device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation according to claims 2 to 4, characterized in that: the ultrasonic cavitators (2) are connected to the power supply (3), and the ultrasonic cavitators (2) are a plurality of combined ultrasonic sources.
6. The device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation according to claims 2 to 4, characterized in that: the separation section is a porous plate and is provided with a trapezoidal wound dead water cap.
7. The working method of the device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1 is characterized by comprising the following steps:
step 1, when equipment with large flow and high gas/liquid ratio is treated, selecting an ultrasonic device, a hydrodynamic cavitation device and a catalytic oxidation device: an ultrasonic cavitator (2) is arranged at a jet flow return section of the water inlet pipeline, and the ultrasonic cavitator (2) is a plurality of combined ultrasonic sources; an ultrasonic cavitator (2) is also arranged in the water inlet chamber of the gas-liquid mixing zone (6); the wastewater sequentially passes through a circulating booster pump (9) and a primary high-speed ejector (7) to be mixed with ozone for the first time, and hydrodynamic cavitation is formed at an outlet nozzle of the primary high-speed ejector (7); the mixture of the wastewater and the ozone is sucked into the secondary jet nozzle (8) in the water inlet chamber of the gas-liquid mixing zone (6) again to be mixed, and secondary hydrodynamic cavitation is formed;
step 2, when equipment with medium flow, low COD concentration and small gas/liquid ratio is treated, selecting a hydrodynamic cavitation and catalytic oxidation type device: a bypass pipeline is arranged on the water inlet main pipeline, a circulating booster pump (9) and a main ejector (10) are additionally arranged, the bypassed wastewater returns to the water inlet main pipeline in two ways after once jet flow is increased by the main ejector (10), the bypassed wastewater is symmetrically arranged on two sides of the water inlet main pipeline, and a stirring chain type static mixer (11) is arranged on the water inlet main pipeline; a wastewater outlet of the gas-liquid mixing zone (6) is connected to an inlet of a circulating booster pump (9), an outlet of the circulating booster pump (9) is connected to an inlet of an auxiliary ejector (12), and an outlet of the auxiliary ejector (12) is connected to a water inlet chamber of the gas-liquid mixing zone (6);
and 3, selecting a hydrodynamic cavitation device when treating equipment with large and medium flow, high COD removal amount and medium gas/liquid ratio, arranging a bypass pipeline on the water inlet main pipeline, externally adding a circulating booster pump (9) and a main ejector (10) on the bypass, increasing jet flow once by the bypass wastewater through the main ejector (10), returning the bypass wastewater to the water inlet main pipeline in two ways, symmetrically arranging the bypass pipeline on two sides of the water inlet main pipeline, and arranging a stirring chain type static mixer (11) on the water inlet main pipeline.
8. The working method of the device for realizing gas-water miscible activation by secondary hydrodynamic cavitation and ultrasonic cavitation according to claim 7 is characterized in that the number and specification of the primary high-speed ejectors (7) in the step 1 are determined according to the amount of treated water:
when the wastewater treatment capacity is small, the number of the primary high-speed ejectors (7) is set to be one, at the moment, outlet nozzles of the primary high-speed ejectors (7) are divided into two paths to symmetrically discharge water to enter a gas-liquid mixing area (6), and secondary jet flow nozzles (8) are arranged in the tangential direction of the circumference of the cylindrical water inlet chamber;
when the treated water volume of the waste water is large, the number of the primary high-speed jet devices (7) is two, outlet nozzles of each primary high-speed jet device (7) are symmetrically distributed into a gas-liquid mixing area (6) by two paths of water, and secondary jet nozzles (8) are arranged in the tangential direction of the circumference at the position where the outlet nozzles enter the gas-liquid mixing area (6).
9. The working method of the device for realizing gas-water mixing and activation by secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 7 is characterized in that, in the water inlet chamber of the gas-liquid mixing zone (6) in the step 1: and if the number of the secondary jet flow nozzles (8) is two, the opposite-impact arrangement is adopted, and if the number of the secondary jet flow nozzles (8) is four, the arrangement is adopted in the tangential direction along the circumference of the water inlet chamber.
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