CN111960523B - Method and device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation - Google Patents
Method and device for realizing gas-water miscible activation 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 133
- 230000004913 activation Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 19
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 92
- 239000002351 wastewater Substances 0.000 claims abstract description 89
- 230000003647 oxidation Effects 0.000 claims abstract description 86
- 230000003197 catalytic effect Effects 0.000 claims abstract description 79
- 238000002156 mixing Methods 0.000 claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 58
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000003054 catalyst Substances 0.000 claims abstract description 22
- 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 8
- 238000003756 stirring Methods 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 2
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- 230000000694 effects Effects 0.000 abstract description 7
- 238000004090 dissolution Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000008358 core component Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- 230000015556 catabolic process Effects 0.000 description 8
- 238000006731 degradation reaction Methods 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
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- 230000005514 two-phase flow Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002101 nanobubble Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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Classifications
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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
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- 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
-
- 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
-
- 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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- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Water Supply & Treatment (AREA)
- 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 miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation, which comprises: ultrasonic + hydrodynamic cavitation + catalytic oxidation type device, hydrodynamic cavitation + catalytic oxidation type device and hydrodynamic cavitation type device; the ultrasonic + hydrodynamic cavitation + catalytic oxidation device comprises: the device comprises a wastewater pump, an ultrasonic cavitation device, 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 filling area. The beneficial effects of the invention are as follows: the device adopted by the invention is a front-end device of the reactor for advanced oxidation treatment of wastewater, can be combined with advanced oxidation reaction main equipment into a whole, can be used as a link of the main equipment, can also be independently used as a front-end equipment for front-end gas-liquid mixing, ozone dissolution, hydrodynamic cavitation (activation energy) and uniform water distribution when the wastewater is subjected to ozone catalytic oxidation, and is 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 miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation.
Background
The effect of advanced oxidation of organic wastewater, such as ozone catalytic oxidation, 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 first, and in order to ensure the effect of ozone catalytic oxidation of organic wastewater, the links of thorough mixing and dissolution of gas and liquid and energy activation of ozone in water are important.
The high-efficiency degradation treatment difficulty of various organic wastewater is great, particularly coal chemical wastewater, aromatic hydrocarbon organic matters containing macromolecules are more difficult to degrade, the ozone catalytic oxidation method is one of advanced oxidation, hydroxyl free radicals are generated based on the action of ozone and water under the action of a catalyst, the aromatic hydrocarbon organic matters can be subjected to ring-opening degradation due to the high oxidation-reduction potential of the hydroxyl free radicals, in the treatment process, ozone is required to be dissolved in the wastewater, the higher the solubility of the ozone in the water is, the more the hydroxyl free radicals are generated after catalysis is, the solubility of the ozone in the water is limited at normal temperature and normal pressure, and a special front mixing and dissolving device is required to be designed to promote the high-efficiency ozone catalytic oxidation degradation of the organic wastewater if the dissolution and the mixing of gas-liquid two phases are to be achieved; secondly, if jet flow can be used in the premixing process and hydrodynamic cavitation is carried out on the wastewater, more superoxide radicals and hydroxyl radicals can be further generated by ozone and water, the pre-broken chain pre-oxidation treatment of the organic wastewater in the premixing section is facilitated, and a foundation is laid for the subsequent catalytic oxidation of the rear end of the organic wastewater until the 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 miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation.
The device for realizing gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation comprises: ultrasonic + hydrodynamic cavitation + catalytic oxidation type device, hydrodynamic cavitation + catalytic oxidation type device and hydrodynamic cavitation type device.
Preferably, the ultrasonic+hydrodynamic cavitation+catalytic oxidation apparatus includes: the device comprises a wastewater pump, an ultrasonic cavitation device, 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 filling area; 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 cavitation device, an outlet pipeline of the ultrasonic cavitation device 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 jet device, and an outlet of the primary high-speed jet device 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 pipeline outlet of the ultrasonic cavitation device, and the pipeline inlet of the ultrasonic cavitation device is connected to the wastewater pump; a separation section (ozone catalytic oxidation fixed bed) is arranged between the water inlet chamber and the catalyst filling area, and a water distributor is arranged on the separation section; the two primary high-speed jet devices are symmetrically arranged around the catalytic oxidation tower, the catalyst filling 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 filling area, all secondary jet nozzle inlets arranged in the tangential direction (clockwise or anticlockwise) of the circumference of the catalyst filling area are connected with the two primary high-speed jet devices, the two primary high-speed jet devices are connected with the circulating booster pump outlets, the circulating booster pump inlets are connected with the outlet pipeline of the ultrasonic cavitation device, and the inlet pipeline of the ultrasonic cavitation device is connected with the wastewater pump.
Preferably, the hydrodynamic cavitation+catalytic oxidation type apparatus includes: the device comprises a wastewater 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 area, and the upper part of the catalytic oxidation tower is a catalyst filling area; a separation section is arranged between the catalyst filling 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 wastewater pump, a circulating booster pump is additionally arranged on the branch, the outlet of the booster pump is connected with a main jet device, a static mixer is arranged on the main pipeline of the water supply pipeline at the outlet of the wastewater pump, and an outlet pipeline of the static mixer is connected with a catalytic oxidation tower; the waste water outlet of the gas-liquid mixing area is connected with the inlet of the circulating booster pump, the outlet of the circulating booster pump is connected with the inlet of the auxiliary jet device, and the outlet of the auxiliary jet device is connected with the water inlet chamber of the gas-liquid mixing area.
Preferably, the hydrodynamic cavitation device includes: the device comprises a wastewater 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 area, and the upper part of the catalytic oxidation tower is a catalyst filling area; a separation section is arranged between the catalyst filling 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 wastewater pump, a circulating booster pump is additionally arranged on the branch, the outlet of the booster pump is connected with a main jet device, a static mixer is arranged on the main pipeline of the water supply pipeline at the outlet of the wastewater pump, and an outlet pipeline of the static mixer is connected into a catalytic oxidation tower.
Preferably, the ultrasonic cavitators are connected to a power supply, the ultrasonic cavitators are a plurality of combined ultrasonic sources, the combination and input power of the ultrasonic sources can be regulated according to the waste water amount and the COD equivalent of the inflow water, and the input number and input power of the ultrasonic sources can be regulated according to the inflow water amount and the COD so as to meet the requirements of pretreatment, oxidation chain breakage and degradation targets.
Preferably, the separation section is in a form of a trapezoid winding dead water cap arranged on the porous plate, so that uniform water distribution of effluent of the mixing chamber is ensured, drift of fluid is prevented, and loss of catalytic filler is avoided.
The working method of the device for realizing the gas-water miscible activation through the secondary hydrodynamic cavitation and the ultrasonic cavitation comprises the following steps:
step 1, when equipment with larger flow and high required gas/liquid ratio is treated, selecting an ultrasonic + hydrodynamic cavitation + catalytic oxidation type device: an ultrasonic cavitation device is arranged at the jet flow return section of the water inlet pipeline, the ultrasonic cavitation device is a plurality of combined ultrasonic sources, and the combination and input power of the ultrasonic sources can be adjusted according to the waste water amount and the COD equivalent of the inlet water; an ultrasonic cavitation device is also arranged in the water inlet chamber of the gas-liquid mixing zone, and the input number and input power of ultrasonic sources can be regulated according to the water inflow and COD so as to meet the requirements of pretreatment, oxidation chain breakage and degradation targets; the wastewater sequentially passes through a circulating booster pump and a primary high-speed jet device, is mixed with ozone for the first time, and forms hydrodynamic cavitation at an outlet nozzle of the primary high-speed jet device; after the mixture of the wastewater and the ozone enters a secondary jet nozzle in a water inlet chamber of the gas-liquid mixing zone, the mixture is sucked into the surrounding wastewater again to be mixed, and secondary hydrodynamic cavitation is formed;
step 2, when equipment with medium flow, lower 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 and a main jet device are additionally arranged, the bypass waste water is added with jet flow once through the main jet device, then the waste water returns to the water inlet main pipeline in two paths, 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; the waste water outlet of the gas-liquid mixing zone is connected with the inlet of the circulating booster pump, the outlet of the circulating booster pump is connected with the inlet of the auxiliary jet device, and the outlet of the auxiliary jet device is connected with the water inlet chamber of the gas-liquid mixing zone;
step 3, when the equipment with large and medium flow, high COD removal amount and medium gas/liquid ratio is treated, a hydrodynamic cavitation type device is selected because more ozone is needed, a bypass pipeline is arranged on a water inlet main pipeline, a circulating booster pump and a main jet device are additionally arranged on the bypass, the bypass waste water is added with jet flow once through the main jet device, the bypass waste water returns to the water inlet main pipeline in two ways, the bypass waste water is symmetrically arranged on two sides of the water inlet main pipeline, and stirring type static mixers are arranged on the water inlet main pipeline, so that the equipment can adapt to the wastewater treatment with higher COD, meet the requirement of higher ozone inhalation amount, and meet the requirement of ozone inhalation amount which cannot be met by jet flow in any single form.
Preferably, the number and the specification of the primary high-speed ejectors in the step 1 are determined according to the treated water amount:
when the wastewater treatment capacity is smaller, the number of the primary high-speed jet devices is set to be one, at the moment, outlet nozzles of the primary high-speed jet devices symmetrically enter a gas-liquid mixing area in two paths of water, and secondary jet nozzles are arranged in the tangential direction of the circumference of the position entering the cylindrical water inlet chamber; the number of the secondary jet nozzles is designed according to the incident flow;
when the water treatment amount of the wastewater is large, the number of the primary high-speed jet devices is two, the outlet nozzles of each primary high-speed jet device are symmetrically arranged in two paths of water to enter the gas-liquid mixing area, and the tangential direction of the circumference of the gas-liquid mixing area is provided with the secondary jet nozzles; the number of secondary jet nozzles is designed according to the incident flow.
Preferably, in the step 1, the gas-liquid mixing area is arranged in a water inlet chamber: if two groups of secondary jet nozzles are adopted, opposite flushing arrangement is adopted, and if four groups of secondary jet nozzles are adopted, tangential direction (clockwise or anticlockwise) along the circumference of the water inlet chamber is adopted, so that jet fluid is ensured to form rotational flow to drive water inlet to carry out mechanical stirring, and the effect of strengthening mixing mass transfer is achieved.
The beneficial effects of the invention are as follows:
1) The device adopted by the invention is a front-end device of the reactor for advanced oxidation treatment of wastewater, can be combined with advanced oxidation reaction main equipment into a whole, can be used as a link of the main equipment, can also be independently used as a front-end equipment for front-end gas-liquid mixing, ozone dissolution, hydrodynamic cavitation (activation energy) and uniform water distribution when the wastewater is subjected to ozone catalytic oxidation, and is 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 hydrodynamic cavitation and ultrasonic cavitation combination or independently, which lay a favorable foundation for the subsequent heterogeneous catalytic oxidation and degradation of organic matters by ozone; according to different ozone demands, the invention combines the processes in the most energy-saving mode, improves the ozone utilization rate and the cavitation activation degree to the maximum extent, and creates conditions for degrading organic matters by catalytic oxidation.
Drawings
FIG. 1 is a schematic diagram of an ultrasonic + hydrodynamic cavitation + catalytic oxidation apparatus;
FIG. 2 is a schematic diagram of a hydrodynamic cavitation + catalytic oxidation apparatus;
fig. 3 is a schematic diagram of a hydrodynamic cavitation device.
FIG. 4 is a flow chart of catalytic oxidation reaction of ozone.
Reference numerals illustrate: the device comprises a wastewater pump 1, an ultrasonic cavitation device 2, a power supply 3, a catalyst filling area 4, a water distributor 5, a gas-liquid mixing area 6, a primary high-speed jet device 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 invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
The invention relates to a device for fully mixing, dissolving and external field activating (hydrodynamic cavitation and ultrasonic cavitation) ozone gas and wastewater, which comprises a two-phase flow (gas phase and liquid phase) ejector, a vortex reinforced mixing nozzle (secondary jet nozzle), a water inlet ultrasonic transducer (ultrasonic cavitation device), a circulating booster pump, and a tangential arrangement of an incident nozzle, and a bottom uniform water distribution device (water distributor 5) of an ozone catalytic oxidation fixed bed. The device can be arranged at the water inlet section of the catalytic oxidation tower, and can also be independently arranged at the front end of the catalytic oxidation tower as independent equipment. The gas-liquid mixture is uniformly outside the catalytic oxidation tower, a water inlet section of the re-catalytic oxidation tower, such as a mixing zone at the bottom of a reaction fixed bed, can be arranged, and is uniformly mixed with sewage water inlet after ultrasonic irradiation by a water inlet pump due to cavitation of an ejector, then the mixed zone is subjected to external field (ultrasonic) activation to generate more free radicals, a screen is arranged at the upper part to uniformly distribute water so as to ensure that the gas water inlet of the fixed bed is uniformly distributed and does not deviate.
The invention comprises two methods and process combinations for pre-mixing and dissolving gas and liquid corresponding to the requirements of different treatment capacity and different concentration of the influent organic wastewater. When the organic wastewater with different concentrations is degraded by adopting ozone heterogeneous catalytic oxidation, the treatment capacity is different, the required ozone amount is different when the water outlet requirements are different, and the oxygen amount pumped by the ejector needs to be matched with the booster pump. Pretreatment before ozone catalytic oxidation treatment can effectively improve the treatment effect of subsequent ozone catalytic oxidation. The waste water containing macromolecular aromatic hydrocarbon organic matters can be broken into low molecular organic matters through ozone catalytic oxidation, and is mainly based on that ozone and water generate hydroxyl radicals under the action of a catalyst, so that a series of chain reactions are initiated, and the aromatic hydrocarbon organic matters can be subjected to ring opening degradation due to the high oxidation-reduction potential of the hydroxyl radicals, so that whether ozone gas and the waste water can be fully mixed, dissolved and activated is important.
As an example, the method of the invention adopts three different hydrodynamic cavitation modes (the ultrasonic + hydrodynamic cavitation + catalytic oxidation device of fig. 1, the hydrodynamic cavitation + catalytic oxidation device of fig. 2 and the hydrodynamic cavitation type device of fig. 3) and combines the ultrasonic cavitation to fully mix and dissolve ozone with wastewater, and activates the wastewater through cavitation to realize preliminary activation fracture of macromolecular chains of organic matters in the wastewater before ozone catalytic degradation.
The first is aimed at a large process flow rate of about 80-110 m 3 The ozone heterogeneous catalytic oxidation tower/h has high COD (about 1000 mg/L) of organic wastewater to be treated and requires that the COD of effluent after wastewater treatment is at least below 500 mg/L. See figure 1 for details. The combination of this ozone and wastewater premixed preactivated ultrasonic and hydrodynamic cavitation process is of two types, fig. 1 (a) and 1 (b) being of type one and fig. 1 (c) being of type two.
FIG. 1 (a) and FIG. 1 (b) represent type one, wastewater pump enters the wastewater into a pipeline provided with a plurality of groups of ultrasonic transducers with the same frequency and adjustable power for ultrasonic cavitation, so that a certain amount of free radicals (hydroxyl free radicals) are generated by the inlet water under the action of ultrasonic cavitation to activate macromolecular organic matters in the wastewater, the wastewater then enters a mixing area of a catalytic oxidation tower and is fully mixed with a gas-liquid mixture of ozone and wastewater inhaled by a ejector hydraulic secondary cavitation, part of the wastewater in the mixing area is enabled to be mixed, dissolved and cavitated (activated) with ozone gas for the first time by the hydraulic cavitation of a circulating booster pump and the ejector, after being sprayed into an inlet water chamber of a catalytic oxidation tower, through an incident nozzle arranged along the tangential direction of the upper circumference (clockwise or anticlockwise) of a cylindrical mixing device, the ozone is fully mixed, dissolved and re-cavitation (activated), hydrogen free radicals, hydroxyl free radicals and the like generated by the rupture of water molecule bonding bonds are caused by the energy of hydraulic cavitation and explosion during the period, H2O < + > H3 < + > is fully mixed with ozone gas, and then enters a catalytic oxidation tower < + > 4 < + > to perform catalytic oxidation reaction, and a porous membrane is fully degraded by a porous plate < + > of the catalytic oxidation tower < + >, and a filler < > is fully used for carrying out catalytic oxidation reaction;
the device comprises a two-phase flow (gas phase and liquid phase) ejector (primary high-speed ejector), a vortex reinforced mixing nozzle (secondary jet nozzle), a water inlet 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 into waste water in micro-nano bubbles through the hydrodynamic cavitation of the water ejector and the reinforced mixing and secondary cavitation of the secondary nozzle to the maximum extent, the gas-liquid is uniformly mixed outside a catalytic oxidation reaction tank, a water inlet section (water inlet section of the catalytic oxidation tower) of the re-reaction tank can also be arranged, such as a mixing area at the bottom of the reaction fixed bed, the mixed water is uniformly mixed with the sewage water after ultrasonic irradiation by a water inlet pump due to cavitation of the ejector, then external field (ultrasonic cavitation) activation is performed in the mixing area, more free radicals are generated, and a screen (a porous plate is arranged on the upper part to uniformly distribute water to ensure uniform water inlet distribution of the fixed bed, and no drift.
Type two is directed to a larger process flow, about 110m3/h, see FIG. 1 (c), which is more suitable for larger diameter oxidation columns. The COD of the influent water to be treated is higher (about 1000mg/L and above), especially the COD which is required to be removed is larger, the required gas/liquid is larger, when the diameter of the oxidation tower is larger, in order to ensure that the gas-water mixture of the effluent water of the jet device is sprayed into the water distribution of the oxidation tower uniformly, a circulating booster pump is adopted for supplying two water jets and symmetrically arranged around the oxidation tower, tangential incidence is adopted after entering the tower, so that the water flow in the mixing area forms a rotational flow and is in an internal rotational flow stirring state, the uniform mixing with the influent water is further enhanced, and the hydrodynamic cavitation effect is carried out to perform primary activation and chain breakage on macromolecular organic matters in the wastewater.
The second is the energy-saving hydrodynamic cavitation premixing, dissolving and activating device with medium treatment capacity, which is shown in fig. 2 and 3, the treatment flow is about 60-80 m3/h, the COD fluctuation of the inflow water is large, and the COD removal also has fluctuation. The process of fig. 2 adopts a branch line which is separated from a water supply pipeline of a wastewater inlet pump outlet according to the COD of the inflow water, a pipeline booster pump is additionally arranged on the branch line, the outlet of the booster pump is connected with a jet device, ozone is sucked from the jet device and mixed with the wastewater, then returns to a main wastewater pipeline through a pipeline static mixer arranged on a water supply main pipeline to be uniformly mixed with the main wastewater, and then enters an oxidation tower together with the main pipeline wastewater to ensure uniform mixing of the main wastewater with a large diameter, and a circulating pipeline is additionally connected in a mixing zone to meet the ozone demand, and the circulating booster pump and the water jet device are arranged for supplementing the defect of bypass ozone suction quantity of the main wastewater. The two jet devices can operate simultaneously or singly, completely depend on the water inflow amount and the COD concentration of the water inflow, have large ozone demand when the two jet devices are large, are fully opened, and independently operate one jet device when the ozone demand is small, so that the jet device is an energy-saving operation mode.
Fig. 3 only omits jet suction of the circulating booster part in fig. 2, is suitable for ozone suction of low COD, retains the jet device of the bypass of the main loop, and also can cancel the jet device of the bypass of the main loop, and retains the jet device of the circulating booster part.
Claims (6)
1. A device for achieving gas-water miscible activation through secondary hydrodynamic cavitation and ultrasonic cavitation, comprising: ultrasonic + hydrodynamic cavitation + catalytic oxidation type device, hydrodynamic cavitation + catalytic oxidation type device and hydrodynamic cavitation type device;
the ultrasonic + hydrodynamic cavitation + catalytic oxidation device comprises: the device comprises a wastewater pump (1), an ultrasonic cavitation device (2), a power supply (3), a primary high-speed jet device (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 filling zone (4);
the upper part of the gas-liquid mixing area (6) is provided with a water inlet chamber, the wastewater pump (1) is connected with an inlet pipeline of the ultrasonic cavitation device (2), an outlet pipeline of the ultrasonic cavitation device (2) is connected with the gas-liquid mixing area (6), a wastewater outlet of the gas-liquid mixing area (6) is connected with an inlet of the circulating booster pump (9), an outlet of the circulating booster pump (9) is connected with an inlet of the primary high-speed jet device (7), and an outlet of the primary high-speed jet device (7) is connected with the water inlet chamber of the gas-liquid mixing area (6); the water inlet chamber of the gas-liquid mixing zone (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 cavitation device (2), and the pipeline inlet of the ultrasonic cavitation device (2) is connected to the wastewater pump (1);
a separation section is arranged between the water inlet chamber and the catalyst filling area (4), and a water distributor (5) is arranged on the separation section; the two primary high-speed jet devices (7) are symmetrically arranged around the catalytic oxidation tower, the catalyst filling 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 filling area (4), all inlets of the secondary jet nozzles (8) arranged in the tangential direction of the circumference of the catalyst filling area (4) are connected with outlets of the two primary high-speed jet devices (7), inlets of the two primary high-speed jet devices (7) are connected with outlets of the circulating booster pump (9), an inlet of the circulating booster pump (9) is connected with an outlet pipeline of the ultrasonic cavitation device (2), and an inlet pipeline of the ultrasonic cavitation device (2) is connected with the wastewater pump (1);
the hydrodynamic cavitation + catalytic oxidation device comprises: the device comprises a wastewater 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 filling zone (4); a separation section is arranged between the catalyst filling section (4) and the gas-liquid mixing section (6), and a water distributor (5) is arranged on the separation section; a branch is divided from an outlet water supply pipeline of the wastewater pump (1), a circulating booster pump (9) is additionally arranged on the branch, an outlet of the booster pump is connected with a main jet device (10), a static mixer (11) is arranged on the main pipeline of the outlet water supply pipeline of the wastewater pump (1), and an outlet pipeline of the static mixer (11) is connected into a catalytic oxidation tower; the waste water outlet of the gas-liquid mixing zone (6) is connected with the inlet of the circulating booster pump (9), the outlet of the circulating booster pump (9) is connected with the inlet of the auxiliary jet device (12), and the outlet of the auxiliary jet device (12) is connected with the water inlet chamber of the gas-liquid mixing zone (6);
the hydrodynamic cavitation type device comprises: the device comprises a wastewater 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 filling zone (4); a separation section is arranged between the catalyst filling section (4) and the gas-liquid mixing section (6), and a water distributor (5) is arranged on the separation section; a branch is separated from an outlet water supply pipeline of the wastewater pump (1), a circulating booster pump (9) is additionally arranged on the branch, an outlet of the booster pump is connected with a main jet device (10), a static mixer (11) is arranged on the main pipeline of the outlet water supply pipeline of the wastewater pump (1), and an outlet pipeline of the static mixer (11) is connected into a catalytic oxidation tower.
2. The apparatus for achieving gas-water miscible activation by secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1, wherein: the ultrasonic cavitators (2) are connected to the power supply (3), and the ultrasonic cavitators (2) are a plurality of combined ultrasonic sources.
3. The apparatus for achieving gas-water miscible activation by secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1, wherein: the separation section is a trapezoid winding dead water cap arranged on the porous plate.
4. A method of operating a device for effecting gas-water miscible activation by secondary hydrodynamic cavitation and ultrasonic cavitation as claimed in claim 1, comprising the steps of:
step 1, when equipment with larger flow and high gas/liquid ratio is treated, selecting an ultrasonic, hydrodynamic cavitation and catalytic oxidation type device: an ultrasonic cavitation device (2) is arranged at the jet flow return section of the water inlet pipeline, and the ultrasonic cavitation device (2) is a plurality of combined ultrasonic sources; an ultrasonic cavitation device (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 jet device (7), is mixed with ozone for the first time, and forms hydrodynamic cavitation at an outlet nozzle of the primary high-speed jet device (7); after the mixture of the wastewater and the ozone enters a secondary jet nozzle (8) in a water inlet chamber of a gas-liquid mixing zone (6), the mixture is sucked into the surrounding wastewater again to be mixed, and secondary hydrodynamic cavitation is formed;
step 2, when equipment with medium flow, lower 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 jet device (10) are additionally arranged, the bypass waste water is added with jet flow once through the main jet device (10), then the waste water returns to the water inlet main pipeline in two paths, the waste water is symmetrically arranged on two sides of the water inlet main pipeline, and a stirring type static mixer (11) is arranged on the water inlet main pipeline; the waste water outlet of the gas-liquid mixing zone (6) is connected with the inlet of the circulating booster pump (9), the outlet of the circulating booster pump (9) is connected with the inlet of the auxiliary jet device (12), and the outlet of the auxiliary jet device (12) is connected with the water inlet chamber of the gas-liquid mixing zone (6);
and 3, selecting a hydrodynamic cavitation type device when treating equipment with large and medium flow, high COD removal amount and medium gas/liquid ratio, arranging a bypass pipeline on a water inlet main pipeline, adding a circulating booster pump (9) and a main jet device (10) on the bypass pipeline, adding jet flow once by the bypass pipeline through the main jet device (10), returning the bypass wastewater to the water inlet main pipeline in two ways, symmetrically arranging two sides of the water inlet main pipeline, and arranging stirring-type static mixers (11) on the water inlet main pipeline.
5. The working method of the device for realizing gas-water miscible activation by secondary hydrodynamic cavitation and ultrasonic cavitation according to claim 4, wherein the number and specification of the primary high-speed jet devices (7) in the step 1 are determined according to the treated water amount:
when the wastewater treatment capacity is smaller, the number of the primary high-speed jet devices (7) is set to be one, at the moment, outlet nozzles of the primary high-speed jet devices (7) symmetrically enter a gas-liquid mixing area (6) in two paths of water outlet, and secondary jet nozzles (8) are arranged in the tangential direction of the circumference of the position entering the cylindrical water inlet chamber;
when the water treatment amount of wastewater 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 arranged in two paths of water to enter the gas-liquid mixing area (6), and secondary jet nozzles (8) are arranged in the tangential direction of the circumference of the position entering the gas-liquid mixing area (6).
6. The working method of the device for realizing gas-water miscible activation by the secondary hydrodynamic cavitation and ultrasonic cavitation according to claim 4, wherein in the step 1, the gas-liquid mixing zone (6) is arranged in a water inlet chamber: if the two groups of the secondary jet nozzles (8) are arranged in opposite flushing mode, if the four groups of the secondary jet nozzles (8) are arranged in tangential direction along the circumference of the water inlet chamber.
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