CN114890501A - Hydrodynamic cavitation device based on parallel orifice plates and application of hydrodynamic cavitation device in degradation of dye-containing wastewater - Google Patents
Hydrodynamic cavitation device based on parallel orifice plates and application of hydrodynamic cavitation device in degradation of dye-containing wastewater Download PDFInfo
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- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
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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
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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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a hydrodynamic cavitation device based on parallel orifice plates and application thereof in degrading wastewater containing dye. Based on a parallel orifice plate hydrodynamic cavitation device, a self-priming pump is connected with a mixed reaction tank (10) through a water inlet pipeline, the other end of the self-priming pump is connected with a flowmeter I and a pressure gauge I through a main pipeline and then is divided into a first branch and a second branch, and the first branch is sequentially connected with a flowmeter II, a pressure gauge II, a temperature gauge I, a porous orifice plate I, a temperature gauge II and a water return pipeline; the second branch is sequentially connected with a flowmeter III, a pressure gauge III, a thermometer III, a porous orifice plate II, a thermometer IV and a water return pipeline; the water return pipeline is connected with the mixed reaction tank.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a hydrodynamic cavitation device based on parallel orifice plates and application thereof in degrading wastewater containing dye.
Background
Methyl violet is an organic dye that is cationic when dissolved in water and gives other materials a bright and strong color. The dye used as an industrial synthetic organic compound has the characteristic of a complex structure, is difficult to degrade and has strong durability. After entering the natural environment without effective treatment, the dyes in the wastewater pose serious environmental hazards and then further threaten human health. Therefore, treatment of dyeing wastewater is not only environmentally friendly, but also has the resource reusable, which has become the focus of current social attention. Common methods for treating dyeing wastewater include coagulation sedimentation, adsorption, biodegradation, and chemical oxidation. Generally, these methods are not ideal for the treatment of dyed wastewater due to small throughput, low cycle time, low COD and TOC removal rates. In addition, they are also prone to secondary contamination.
In recent years, due to a plurality of organic pollutants which are difficult to treat, the organic pollutants have wide development potential and good application prospect. Generally, advanced oxidation techniques (AOPs) include fenton oxidation, photocatalytic oxidation, electrochemical oxidation, ultrasonic cavitation, and the like. The highly efficient hydroxyl radical (. OH) is the core of AOPs. Hydroxyl radicals (. OH) are strong oxidizers with high redox potentials (2.80eV), but without any selectivity for organic contaminants. It can rapidly react with organic pollutants and harmful substances and then efficiently convert them into CO 2 ，H 2 O or an inorganic salt. In particular, Hydrodynamic Cavitation (HC), a new AOPs for organic pollutant degradation, brings large-scale remediation and low-cost investment possibilities, which is considered to be a very promising approach for wastewater treatment.
The main feature of HC technology is the use of fluid constriction of orifices or rotating parts to stimulate a series of physicochemical reactions, mainly including aqueous phase combustion, radical reactions and mechanical action. Generally, an increase in the flow rate of fluid through the cavitation device results in a sharp drop in pressure. When the hydrostatic pressure of the fluid is reduced below the partial saturation vapor pressure, some of the fluid molecules will vaporize. These vaporized fluid molecules will become cavities and then grow gradually into cavitation bubbles over time. Cavitation bubble collapse occurs in a very short time with further increase in pressure (10) -3 ms)，Simultaneously releases a large amount of energy, and is accompanied with the formation of strong-cracking shock wave, high-speed jet flow (100m/s), high temperature (5000-. Under these extreme conditions, a portion of the water molecules can split into strongly oxidizing hydroxyl radicals (. OH) and hydrogen radicals (. H). Then, dissolved oxygen (O) in water 2 ) Can react with H to generate superoxide radical (. O) 2 - ). In one aspect, a portion of the organic contaminants is in contact with O dissolved in the liquid 2 Reacting, performing similar water phase combustion process to generate carbon dioxide (CO) 2 ) Water (H) 2 O) and inorganic ions. On the other hand, the radicals (. OH and. O) generated 2 - ) It is also possible to oxidize organic pollutants and then finally mineralize them to CO 2 ，H 2 O and inorganic ions.
The large amount of internal energy excited by the small amount of electrical energy during cavitation must also be effectively utilized. The internal energy is embodied in the form of heat, and in order to maximally utilize the heat energy generated by hydrodynamic cavitation, necessary heat preservation methods and reasonable utilization modes need to be continuously explored.
The parallel orifice plate hydrodynamic cavitation technology is used as an improved advanced oxidation technology, has the advantages of low equipment cost, simple process, high efficiency, thoroughness and no byproduct generation, brings a high-temperature heat source which can meet certain social requirements, and is suitable for being applied to the fields of wastewater treatment and heat supply on a large scale.
Compared with the traditional hydrodynamic cavitation technology, the single-hole plate is used as a cavitation device for decoloring and mineralizing organic pollutants. However, these conventional treatment methods have disadvantages and limitations of high cost, low efficiency, insufficient strength, and incomplete decomposition, so that none of these methods can efficiently treat the dye wastewater.
Disclosure of Invention
In order to more efficiently carry out decoloration and mineralization treatment on organic dye wastewater, the invention provides a novel method for effectively degrading dye and efficiently generating heat by using hydrodynamic cavitation of parallel pore plates.
In order to achieve the purpose, the invention adopts the technical scheme that: a hydraulic cavitation device based on a parallel orifice plate is characterized in that a self-priming pump is connected with a mixed reaction tank through a water inlet pipeline, the other end of the self-priming pump is connected with a flowmeter I and a pressure gauge I through a main pipeline and then is divided into a first branch and a second branch, and the first branch is sequentially connected with a flowmeter II, a pressure gauge II, a temperature gauge I, a porous orifice plate I, a temperature gauge II and a water return pipeline; the second branch is sequentially connected with a flowmeter III, a pressure gauge III, a thermometer III, a porous orifice plate II, a thermometer IV and a water return pipeline; the water return pipeline is connected with the mixed reaction tank.
Preferably, in the hydrodynamic cavitation device based on the parallel orifice plate, a third branch is arranged in front of the flowmeter I on the main pipeline, and the third branch is sequentially connected with the thermometer V, the pressure gauge IV, the butterfly valve I and the water return pipeline.
Preferably, in the hydrodynamic cavitation device based on the parallel orifice plates, the orifices of the first and second orifice plates are circular, the orifice angle is a flat angle, the number of the orifices is 1-10, the thickness of the orifice plate is 2.0-6.0mm, the radius of each orifice is 1.0-2.0mm, and the area of the orifice distribution area is 3.0-14mm 2 The orifices are arranged radially on the orifice plate.
Preferably, the above-mentioned one kind is based on parallelly connected orifice plate hydrodynamic cavitation device, and the mixed reaction tank passes through the pipeline and links to each other with hot water storage jar, be equipped with butterfly valve II on the pipeline, hot water storage jar lower extreme is equipped with the drain pipe, is equipped with regulating switch on the drain pipe.
Preferably, in the above hydrodynamic cavitation device based on the parallel orifice plate, the mixing reaction tank is connected with a water source through a pipeline, and a water replenishing switch is arranged on the pipeline.
Any one of the above-mentioned application based on parallel orifice plate hydrodynamic cavitation device in degrading the waste water containing dyestuff, the method is as follows: during mixed reaction pond is arranged in to the waste water that contains the dyestuff, opens the self priming pump, and the waste water that contains the dyestuff gets back to mixed reaction pond through flowmeter I, manometer I, first branch road, second branch road, return water pipeline, and the waste water that contains the dyestuff carries out water conservancy cavitation when porous orifice plate I, the porous orifice plate II in first branch road, the second branch road.
Preferably, in the above application, the dye is methyl violet.
Drawings
FIG. 1 is a schematic structural diagram of a hydrodynamic cavitation system based on parallel orifice plates;
FIG. 2 is a graph showing the effect of hydrodynamic cavitation hole count of a single-hole plate on the degradation and heat generation of organic dyes;
FIG. 3 shows a constant number n of total holes 1 +n 2 ＝8(n 1 ＝1～4and n 2 7-4) when the organic dye is degraded effectively and heat is generated efficiently; (a is a graph of the degradation tendency of the organic dye (methyl violet) and b is a graph of the temperature of the organic solution at a particular time point).
FIG. 4 shows the total number of holes n 1 +n 2 ＝6～10(n 1 ＝3～5and n 2 3-5) influence diagram of hydrodynamic cavitation of the parallel orifice plate on effective degradation and efficient heat production of organic dye when the pattern changes regularly; (a is a graph of the degradation tendency of the organic dye (methyl violet), b is a graph of the temperature of the organic solution at a particular time point).
FIG. 5 is a graph showing the effect of hydrodynamic cavitation of parallel orifice plates on the effective degradation of organic dyes and the efficient heat generation at different inlet pressures; (a is a degradation trend graph of the organic dye (methyl violet), and b is a temperature graph of the organic solution under different pressure systems).
FIG. 6 is a graph showing the effect of hydrodynamic cavitation of parallel orifice plates on the effective degradation of organic dyes under different temperature control conditions;
FIG. 7 is a graph showing the effect of hydrodynamic cavitation of parallel orifice plates on the effective degradation of organic dyes and the efficient heat generation under different concentrations; wherein a is a degradation trend graph of the organic dye (methyl violet) under different concentrations, b is a temperature change trend graph of the organic solution along with time, and c is a temperature graph of the solution at a specific time point.
FIG. 8 is a graph showing the effect of hydrodynamic cavitation of parallel orifice plates on the effective degradation of organic dyes and the efficient heat generation under different conditions of a radical scavenger; wherein a is a degradation trend graph of an organic dye (methyl violet) of a hydrodynamic cavitation system in the presence of different capture agents, b is a change trend graph of the temperature of an organic solution along with time, and c is a graph of the temperature of the solution at a specific time point.
FIG. 9 is a schematic view of a multi-well plate.
Wherein, 1-water inlet pipeline; 2-a main pipeline; 3-a flow meter; 4-a shock-proof pressure gauge; 5-precision thermometer; 6-porous orifice plate; 7-a butterfly switch, 8-a water outlet pipeline, 9-an adjusting switch and 10-a mixed reaction tank; 11-a hot water storage tank and 12-a cold and hot water self-priming pump;
Detailed Description
A system for effectively degrading dyes and efficiently generating heat by hydrodynamic cavitation of a parallel orifice plate comprises a mixed reaction tank which is used for wrapping a layer of polyester heat-insulating cotton outside and is used for bearing organic dye wastewater, a water source of the mixed reaction tank comes from a water replenishing switch, a water inlet pipeline feeds the dye wastewater in the mixed reaction tank into a main pipeline by suction force generated when a cold-hot water self-priming pump works, a main reaction zone communicated with the main pipeline is sequentially connected with a flow meter, a shock-proof pressure meter, a parallel flow meter and a parallel shock-proof pressure meter, the precise temperature meter, the shock-resistant pressure gauge and the butterfly switch are sequentially connected to a secondary pipeline communicated with the main pipeline, fluid on the main pipeline and the secondary pipeline is finally converged in a circulating water outlet pipeline and flows into a mixed reaction tank, and the obtained high-temperature hot water can be guided into a hot water storage tank through the regulating switch and then is guided out through the regulating switch.
In the scheme, the main reaction area on the main circulation pipeline is provided with the hydraulic cavitation generating device porous orifice plate, the measuring device shock-proof pressure gauge, the precision thermometer and the flowmeter. The porous plate has circular holes with flat angle and 1-10 holes, thickness of 2.0-6.0mm, radius of each hole of 1.0-2.0mm, and area of hole distribution region of 3.0-14mm 2 The orifices are arranged radially on the orifice plate.
In the scheme, the system for dye effective degradation and efficient heat production based on parallel orifice plate hydrodynamic cavitation is characterized in that the operation of the secondary line pipeline is mainly based on flow regulation of the main reaction zone and fluid state monitoring, so that organic dye wastewater can react and circulate fluid in the main reaction zone under the optimal cavitation condition, and meanwhile, an outlet on the pipeline is connected with an outlet of the main line reaction zone to reduce heat loss caused by unnecessary fluid volatilization. A precision thermometer, a shock-proof pressure gauge and a butterfly switch are sequentially connected on the base. After the organic dye is degraded by hydrodynamic cavitation through pipeline circulation, the regulating switch is opened to lead out high-temperature hot water to the hot water storage tank, the obtained high-temperature water source can perform profitable activities according to requirements, the supply is convenient for companies needing heat supply and production life, resources can be saved for future social life of human beings in a comprehensive view, and the economic cost is reduced.
In the above scheme, the system for dye effective degradation and efficient heat production based on parallel orifice plate hydrodynamic cavitation comprises the following steps: the method is characterized in that waste water containing organic dye is added into a mixed reaction tank, the waste water is sent into a main pipeline in a negative pressure suction mode through a cold and hot water self-sucking pump, the main pipeline is subjected to the pressure of the pump to enable the waste water to circulate in a main pipeline, the waste water is subjected to the hydrodynamic cavitation effect generated by a parallel porous orifice plate after passing through a flow meter, a shock-resistant pressure gauge and a precision thermometer of a data measuring device, high temperature, high pressure, high jet flow and strong shock wave are generated through the rupture of cavitation bubbles, and strong oxidizing free radicals such as high-temperature hot spots, hydroxyl free radicals and superoxide free radicals are formed through the generated aqueous phase combustion reaction, so that organic matter molecules in the waste water are decomposed into CO 2 、H 2 O and inorganic oxide, thereby degrading organic dye in the wastewater, obtaining high-temperature hot water, and simultaneously transferring the degraded water source to a hot water storage tank for efficient reutilization and redistribution of hot water energy.
In the scheme, the main pipeline is connected with the stainless pipe corrugated pipes of the two branch lines by the 90-degree metal tee respectively in the main reaction zone, and the stainless pipe corrugated pipes have the characteristics of free angle switching, excellent heat preservation performance, good sealing performance and simple and convenient connection so as to uniformly and stably shunt the fluid of the main pipeline; polyester heat insulation cotton with good heat insulation effect is sleeved on the main pipeline, the auxiliary pipeline and the wall of the mixing reaction tank, so that heat exchange between the pipeline and the tank and the outside in the cavitation process can be reduced to the maximum extent, and the heat efficiency in a hydrodynamic cavitation system is ensured; the precise thermometers in front of and behind the parallel pore plates can accurately record temperature changes caused by cavitation, and reflect the relation between effective degradation and efficient heat production of hydrodynamic cavitation in real time.
In the scheme, the cavitation condition of the organic dye wastewater passing through the cavitation device porous orifice plate is adjusted, the number of orifices is changed to 1-10 holes, the connection mode of a single orifice plate or a parallel orifice plate is changed, the pressure cavitation condition is 2.0-4.0bar, the temperature test condition is 20-70 degrees, the concentration test condition is 5.0-15mg/L, and the cycle time is 30-90 min.
In the above protocol, methyl violet (molecular formula: C) was used in the test 24 H 28 ClN 3 Molecular weight: 393.95) simulating organic dye waste water, has high solubility and dyeing property and certain toxicity.
The invention creatively provides a method for degrading organic dye by utilizing the hydrodynamic cavitation of the parallel orifice plates, and the hydrodynamic cavitation system not only can degrade organic pollutant molecules in the action process, but also can efficiently utilize a large amount of heat generated in the reaction. Cavitation via the orifice plate is carried out as follows: when the solution flows through the orifice plate, the smaller cross section of the orifice in the orifice plate has a large throttling effect on the water flow, so that the water flow velocity is suddenly increased and the transverse pressure is reduced. When the hydrostatic pressure of the fluid is reduced below the partial saturation vapor pressure, some of the fluid molecules will vaporize. These vaporized fluid molecules will become cavities and then grow gradually into cavitation bubbles over time. Cavitation bubble collapse occurs in a very short time with further increase in pressure (10) - 3 ms) while releasing a large amount of energy, the formation of a shock wave accompanied by strong cracks, high-speed jet flow (100m/s), high temperature (5000-. Under these extreme conditions, a portion of the water molecules can split into strongly oxidizing hydroxyl radicals (. OH) and hydrogen radicals (. H). Then, dissolved oxygen (O) in water 2 ) Can react with H to generate superoxide radical (O) 2 - ). In one aspect, a portion of the organic contaminants is in contact with O dissolved in the liquid 2 Reacting, performing similar water phase combustion process to generate carbon dioxide (CO) 2 ) Water (H) 2 O) and inorganic ions. On the other hand, the radicals (. OH and. O) generated 2 - ) It is also possible to oxidize organic pollutants and then finally mineralize them to CO 2 ，H 2 O and do notAnd (4) organic ions.
Example 1
As shown in figure 1, a hydraulic cavitation device based on a parallel pore plate is characterized in that a self-sucking pump 12 is connected with a mixed reaction tank 10 through a water inlet pipeline 1, the other end of the self-sucking pump 12 is connected with a flowmeter I3-1 and a pressure gauge I4-1 through a main pipeline 2 and then is divided into a first branch and a second branch, and the first branch is sequentially connected with a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous pore plate I6-1 (shown in figure 9), a thermometer II5-2 and a water return pipeline; the second branch is sequentially connected with a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous orifice plate II6-2, a thermometer IV 5-4 and a water return pipeline; the water return pipeline is connected with the mixing reaction tank 10.
A third branch is arranged in front of the flowmeter I3-1 on the main pipeline 2 and is sequentially connected with a thermometer V5-5, a pressure gauge IV 4-4, a butterfly valve I7-1 and a water return pipeline.
The orifices of the porous orifice plate I6-1 and the porous orifice plate II6-2 are circular, the orifice angle is a flat angle, the orifice number is 1-10, the orifice plate thickness is 2.0-6.0mm, the radius of each orifice is 1.0-2.0mm, and the area of the orifice distribution region is 3.0-14mm 2 The orifices are arranged radially on the orifice plate.
The mixing reaction tank 10 is connected with a hot water storage tank 11 through a pipeline, a butterfly valve II7-2 is arranged on the pipeline, a drain pipe is arranged at the lower end of the hot water storage tank 11, and an adjusting switch 9-2 is arranged on the drain pipe.
The mixing reaction tank 10 is connected with a water source through a pipeline, and a water replenishing switch 9-1 is arranged on the pipeline.
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
adding waste water containing organic dye into a mixed reaction tank 10, driving a main pipeline to circulate through a cold and hot water self-priming pump 12, initiating a rapid chain reaction with organic pollutants by using a porous pore plate I6-1, a porous pore plate II6-2 and active free radicals such as high temperature and high pressure, hydroxyl free radicals and the like generated by a hydrodynamic cavitation effect, and efficiently, rapidly and non-selectively oxidizing harmful substances into CO 2 、H 2 O or an inorganic salt, and a salt thereof,thereby degrading the organic dye in the wastewater, performing hydrodynamic cavitation degradation reaction, and simultaneously, rapidly increasing the overflowing water temperature by high-temperature hot spots generated by water-phase combustion reaction and cavitation bubble collapse.
Adjusting the cavitation condition of the number of holes of the dye in the wastewater containing the organic dye to be 1-10 holes, the pressure cavitation condition to be 2.0-4.0bar, the pH of the wastewater containing the dye to be alkalescent, controlling the temperature of the mixed reaction tank 10 to be 20-70 ℃, the concentration test condition to be 5.0-15mg/L, and the cycle time to be 30-90 min.
The concentration of methyl violet at 30-90min was determined using a UV-Vis spectrophotometer at a wavelength of K400-650 nm, which has a maximum absorption peak at 584nm, belonging to the pi-pi electron transition of double bonds, conjugated double bonds or benzene rings. And (3) solving the linear relation between the concentration and the absorbance by measuring a standard curve of the concentration and the absorbance.
Percent (%) degradation of ═ C 0 -C t ]/C 0 ×100％
Wherein C is 0 Is the initial concentration of the methyl violet solution, C t Is the instantaneous concentration after a certain time (T) of hydrodynamic cavitation.
The methyl violet (molecular formula: C) 24 H 28 ClN 3 Molecular weight: 393.95) has high solubility and dyeing property and certain toxicity.
Example 2
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of single-hole plate hydrodynamic cavitation hole number on degradation and heat generation of organic dye
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 10mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixed reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixed reaction tank 10 and a main pipeline 2, adjusting through a third branch to enable the inlet pressure to be 3.0bar, the thickness of a pore plate to be 4.0mm, the number of orifices to be 1-10, the angle of the orifices to be a flat angle, enabling the methyl violet solution to sequentially pass through a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous pore plate I6-1 and a thermometer II5-2 in the first branch to reach a water return pipeline, enabling a part of the methyl violet solution to sequentially pass through a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous pore plate II6-2 and a thermometer IV 5-4 in the second branch to reach the water return pipeline, enabling the methyl violet solution to flow into the mixed reaction tank 10 for circulating reaction for 90min, and guiding obtained high-temperature hot water into a butterfly-type storage tank 11 through a butterfly valve 7-2 after the reaction is finished, and then the hot water is adjusted through a butterfly valve 11 The throttle switch 9-2 is led out.
The numbers of the single plates of the porous pore plate I6-1 and the porous pore plate II6-2 of the regulating system are respectively in the ranges of 6, 8 and 10, so that the water pump can stably operate.
The thickness of the orifice plate is 4.0mm, the number of orifices is 6, 8 and 10 respectively, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effective degradation and the efficient heat production effects of the orifice plate under the hydraulic cavitation of different single orifice plates on the methyl violet are shown in figure 2.
As can be seen from figure 2, along with the extension of the cycle time, the degradation efficiency of different single-hole plates under the hole number is improved, and the efficiency of degrading the methyl violet wastewater by an 8-hole plate under the temperature of 60 ℃ is the highest and can reach 50.92%. Meanwhile, according to the temperature rising trend, the temperature rising rate of the 8-hole orifice plate is higher than that of other single-hole orifice plates, the highest thermal efficiency can reach 68.33%, and 5.0L of water can be heated to 43.8 ℃ within 30 minutes. However, the temperature of the solution can be raised to nearly 100 ℃ in 50 minutes without controlling the temperature of the entire system. This significant rise in solution temperature without the addition of an external heat source occurs because of the good degradation effect and high heat generation efficiency of the orifice plate hydrodynamic cavitation system. The hydrodynamic cavitation system can generate cavitation effect (the state of high temperature, high pressure and high jet flow brought to the solution by cavitation bubble breakage) to form local hot points, the hot points with extremely high temperature can greatly increase the temperature of the solution, certain heat and heat released by water phase combustion can be released through oxidation reaction of strong oxidizing free radicals generated by the cavitation effect and organic dyes, and the common effect of the actions brings that the temperature of the solution of different systems is greatly increased in different trends.
Example 3
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of hydrodynamic cavitation of two-orifice-plate parallel-connection orifice plate with fixed total orifice number on effective degradation of organic dye and efficient heat production
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 10mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixed reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixed reaction tank 10 and a main pipeline 2, adjusting through a secondary pipeline to enable the inlet pressure to be 3.0bar, enabling the thickness of a pore plate to be 4.0mm, enabling the total number of orifices of parallel pore plates to be 8, enabling the orifice angle to be a flat angle, enabling the methyl violet solution to sequentially pass through a water inlet 1, the cold and hot water self-priming pump 12, the main pipeline 2, a flowmeter 3-1, a shock-resistant pressure gauge 4-1, parallel flowmeters (3-2 and 3-3), parallel shock-resistant pressure gauges (4-2 and 4-3), parallel cavitation zone front-end precision thermometers (5-1 and 5-3), parallel porous pore plates (6-1 and 6-2) and parallel cavitation zone rear-end precision thermometers (5-2 and 5-2), 5-4) finally converging the fluid on the main pipeline and the auxiliary pipeline into a mixed reaction tank (10) through a circulating water outlet pipeline (8), carrying out circulating reaction for 90min, and leading the obtained high-temperature hot water into a hot water storage tank (11) through a butterfly switch (7-2) after the reaction is finished and then leading out the high-temperature hot water through an adjusting switch (9-2).
The two parallel pore plates split the total pore number of 8 pores into 1+7, 2+6, 3+5 and 4+ 4. In this case, the specific distribution of the number of pores is 6-1 for 1 pore and 6-2 for 7 pores. 6-1 is 2 wells and 6-2 is 6 wells. 6-1 is 3 wells, 6-2 is 5 wells. 6-1 is 4 wells, 6-2 is 4 wells.
The thickness of the pore plate is 4.0mm, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, the total number of the two pore plates is fixed, the pore plates are connected in parallel, the hydrodynamic cavitation of the pore plates has the effects of effectively degrading organic dye and efficiently generating heat, and the effects are shown in figure 3.
As can be seen from FIG. 3, with the extension of the cycle time, the degradation efficiency of the parallel pore plates with the total number of the pores split is improved, and the highest degradation efficiency of the parallel 4+4 pore plates for the methyl violet wastewater at 60 ℃ can reach 75.89%. Meanwhile, the temperature rise rate of the parallel 4+4 pore plates is faster than that of other parallel pore plate combinations according to the temperature rise condition of 8 pores of the single pore plate, the thermal efficiency can reach 58.34 percent at most, and 5.0L of water can be heated to 37.4 ℃ within 30 minutes.
Example 4
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of hydrodynamic cavitation of parallel pore plates on effective degradation and efficient heat production of organic dye when total pore number changes regularly
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 10mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixing reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixing reaction tank 10 and a main pipeline 2, wherein the thickness of a pore plate is 4.0mm, the total number of orifices of parallel pore plates is 6-10, the orifice angle is a flat angle, the methyl violet solution sequentially passes through a water inlet 1, the cold and hot water self-priming pump 12 on the main pipeline, the methyl violet solution sequentially passes through a flow meter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous pore plate I6-1 and a thermometer II5-2 in a first branch to reach a water return pipeline, meanwhile, a part of the methyl violet solution sequentially passes through a flow meter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous pore plate II6-2 and a thermometer IV 5-4 in a second branch to reach the water return pipeline and flows into the mixing reaction tank 10, and performing circulating reaction for 90min, and introducing the obtained high-temperature hot water into a hot water storage tank 11 through a butterfly valve 7-2 after the reaction is finished and then discharging the high-temperature hot water through an adjusting switch 9-2.
The two parallel orifice plates arrange the total orifice numbers 6, 7, 8, 9, 10 to 3+3, 3+4, 4+4, 4+5, 5+ 5. The specific distribution of the number of pores is 3 pores for 6-1 and 3 pores for 6-2. 6-1 is 3 wells, 6-2 is 4 wells. 6-1 is 4 wells, 6-2 is 4 wells. 6-1 is 4 wells and 6-2 is 5 wells. 6-1 is 5 wells, 6-2 is 5 wells.
The thickness of the pore plate is 4.0mm, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effects of the hydrodynamic cavitation of the parallel pore plates on the effective degradation of the organic dye and the efficient heat production when the total pore number is changed regularly are shown in figure 4.
As can be seen from FIG. 4, with the extension of the cycle time, the degradation efficiency of the parallel pore plates with the total number of the pores split is improved, and the highest degradation efficiency of the parallel 4+4 pore plates for the methyl violet wastewater at 60 ℃ can reach 75.89%. Meanwhile, the temperature rise of the parallel 4+5 pore plates is faster than that of other parallel pore plate combinations according to the temperature rise of 8 pores of the single pore plate, the thermal efficiency can reach 64.42% at most, and 5.0L of water can be heated to 41.3 ℃ within 30 minutes.
Example 5
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of hydrodynamic cavitation of parallel pore plates on effective degradation of organic dye and efficient heat production under different inlet pressure conditions
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 10mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixing reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixing reaction tank 10 and a main pipeline 2, adjusting through a third branch to enable the inlet pressure to be 2.0-4.0bar, enabling the thickness of a pore plate to be 4.0mm, enabling the number of the orifices of two parallel pore plates to be 4+4 respectively, enabling the orifice angle to be a flat angle, enabling the methyl violet solution to sequentially pass through a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous pore plate I6-1 and a thermometer II5-2 in the first branch to reach a water return pipeline, enabling a part of the methyl violet solution to sequentially pass through a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous pore plate II6-2 and a thermometer IV 5-4 in the second branch to reach the water return pipeline, enabling the methyl violet solution to flow into the mixing reaction tank 10 to perform a circulation reaction for 90min, after the reaction is finished, the obtained high-temperature hot water can be led into a hot water storage tank 11 through a butterfly valve 7-2 and then led out through an adjusting switch 9-2.
The inlet pressure of the parallel 4+4 orifice plates is 2.0bar, 3.0bar and 4.0bar respectively, and the secondary line pressure is within 2.0-3.5 bar.
The thickness of the pore plate is 4.0mm, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effects of the hydrodynamic cavitation of the parallel pore plate under different inlet pressures on the effective degradation of organic dye and the high-efficiency heat production are shown in figure 5.
As can be seen from FIG. 5, with the extension of the cycle time, the degradation efficiency of the parallel 4+4 pore plates with the total number of the pores split is improved under different inlet pressures, and the efficiency of the parallel 4+4 pore plates for degrading the methyl violet wastewater is highest under the inlet pressure of 3.0bar at 60 ℃, and can reach 75.89%. Meanwhile, the temperature rise of the parallel 4+4 pore plates is fast under the condition that the inlet pressure is 4.0bar according to the comparison with the temperature rise of a cold-hot water self-priming pump, the thermal efficiency can reach 62.01% at most, and 5.0L of water can be heated to 39.8 ℃ within 30 minutes.
Example 6
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of hydrodynamic cavitation of parallel pore plates on effective degradation and efficient heat production of organic dye under different temperature control conditions
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 10mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixed reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixed reaction tank 10 and a main pipeline 2, adjusting through a sub-pipeline to enable the inlet pressure to be 3.0bar, enabling the thickness of an orifice plate to be 4.0mm, enabling the number of orifices of two parallel orifice plates to be 4+4 respectively, enabling the orifice angles to be flat angles, enabling the methyl violet solution to sequentially pass through a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous orifice plate I6-1 and a thermometer II5-2 in a first branch to reach a water return pipeline, enabling a part of the methyl violet solution to sequentially pass through a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous orifice plate II6-2 and a thermometer IV 5-4 in a second branch to reach the water return pipeline, enabling the methyl violet solution to flow into the mixed reaction tank 10 to perform a circulation reaction for 90min, after the reaction is finished, the obtained high-temperature hot water can be led into a hot water storage tank 11 through a butterfly valve 7-2 and then led out through an adjusting switch 9-2.
The parallel 4+4 pore plates are controlled to operate under the condition of constant temperature, wherein the temperature is respectively 30 ℃, 45 ℃ and 60 ℃.
The thickness of the pore plate is 4.0mm, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effects of the hydrodynamic cavitation of the parallel pore plate under different temperature control conditions on the effective degradation of organic dye and the high-efficiency heat production are shown in figure 6.
As can be seen from FIG. 6, with the extension of the cycle time, the degradation efficiency of the parallel 4+4 pore plates with the total number of the pores split is improved under different temperature control conditions, and the efficiency of the parallel 4+4 pore plates for degrading the methyl violet wastewater is highest under the inlet pressure of 3.0bar at 60 ℃, and can reach 76.14%.
Example 7
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
research on influence of hydrodynamic cavitation of parallel pore plates on effective degradation and efficient heat production of organic dye under different concentration conditions
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 5.0-15mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixed reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixed reaction tank 10 and a main pipeline 2, adjusting through a sub-pipeline to enable the inlet pressure to be 3.0bar, enabling the thickness of an orifice plate to be 4.0mm, enabling the number of orifices of two parallel orifice plates to be 4+4 respectively, enabling the orifice angles to be flat angles, enabling the methyl violet solution to sequentially pass through a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous orifice plate I6-1 and a thermometer II5-2 in a first branch to reach a water return pipeline, enabling a part of the methyl violet solution to sequentially pass through a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous orifice plate II6-2 and a thermometer IV 5-4 in a second branch to reach the water return pipeline, enabling the methyl violet solution to flow into the mixed reaction tank 10 to perform a circulation reaction for 90min, after the reaction is finished, the obtained high-temperature hot water can be led into a hot water storage tank 11 through a butterfly valve 7-2 and then led out through an adjusting switch 9-2.
The initial concentrations of the solutions of the parallel 4+4 pore plates were changed to 5.0mg/L, 10mg/L and 15mg/L, respectively.
The thickness of the pore plate is 4.0mm, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effects of the hydrodynamic cavitation of the parallel pore plate on the effective degradation of the organic dye and the high-efficiency heat production under the conditions of different initial concentrations of the solution are shown in figure 7.
As can be seen from FIG. 7, with the extension of the cycle time, the degradation efficiency of the parallel 4+4 pore plates after the total pore number is split under the condition of different initial solution concentrations is improved, and the efficiency of the parallel 4+4 pore plates for degrading the methyl violet wastewater is highest at 60 ℃ under the initial concentration of 10mg/L, and can reach 75.98%. Meanwhile, according to comparison of temperature rise conditions under various concentrations, the parallel 4+4 pore plates are fast in temperature rise under the condition that the initial concentration is 15mg/L, the maximum thermal efficiency can reach 61.20%, and 5.0L of water can be heated to 39.2 ℃ within 30 minutes.
Example 8
The method for degrading organic dye in wastewater by using the system for effectively degrading dye and efficiently generating heat by using the hydrodynamic cavitation of the parallel orifice plates as shown in figure 1 comprises the following steps:
influence of hydrodynamic cavitation of parallel pore plates on effective degradation of organic dye and efficient heat production under different free radical trapping agent conditions
The method comprises the following steps: weighing 0.05g of methyl violet (analytically pure) to dissolve in water, adding 5.0L of water into a degradation tank, and uniformly stirring and mixing to obtain a methyl violet solution with the initial concentration of 5.0-15mg/L and the pH value of 7.0; slowly pouring the methyl violet solution into a mixed reaction tank 10, starting a cold and hot water self-priming pump 12 to enable the methyl violet solution to circulate in the mixed reaction tank 10 and a main pipeline 2, adjusting through a sub-pipeline to enable the inlet pressure to be 3.0bar, enabling the thickness of an orifice plate to be 4.0mm, enabling the number of orifices of two parallel orifice plates to be 4+4 respectively, enabling the orifice angles to be flat angles, enabling the methyl violet solution to sequentially pass through a flowmeter II3-2, a pressure gauge II4-2, a thermometer I5-1, a porous orifice plate I6-1 and a thermometer II5-2 in a first branch to reach a water return pipeline, enabling a part of the methyl violet solution to sequentially pass through a flowmeter III 3-3, a pressure gauge III 4-3, a thermometer III 5-3, a porous orifice plate II6-2 and a thermometer IV 5-4 in a second branch to reach the water return pipeline, enabling the methyl violet solution to flow into the mixed reaction tank 10 to perform a circulation reaction for 90min, after the reaction is finished, the obtained high-temperature hot water can be led into a hot water storage tank 11 through a butterfly valve 7-2 and then led out through an adjusting switch 9-2.
Adding tert-butanol (TBA) and p-Benzoquinone (BQ) as. OH and. O, respectively 2 - The degradation rate of the methyl violet is respectively measured under the conditions that no trapping agent is added and no trapping agent is added, and the addition ratio is that the molar ratio of the pollutants to the trapping agent is 1: 20.
the thickness of the pore plate is 4.0mm, the concentration of the methyl violet is 10mg/L, the treatment volume is 5.0L, the reaction time is 90min, the pH value is 7.0, and the effects of the hydrodynamic cavitation of the parallel pore plate on the effective degradation of the organic dye and the high-efficiency heat production under the conditions of different initial concentrations of the solution are shown in figure 8.
As can be seen from FIG. 8, the addition of TBA and BQ both reduced the heat generation efficiency, and it was found that the degradation efficiency of methyl violet dye was 54.54% and 50.58%, indicating that. OH and. O 2 - All participate in the hydrodynamic cavitation process, and 2 - the effect on the degradation reaction is greater than. OH.
Claims (7)
1. A hydrodynamic cavitation device based on a parallel pore plate is characterized in that a self-priming pump (12) is connected with a mixed reaction tank (10) through a water inlet pipeline (1), the other end of the self-priming pump (12) is connected with a flow meter I (3-1) and a pressure gauge I (4-1) through a main pipeline (2) and then is divided into a first branch and a second branch, and the first branch is sequentially connected with the flow meter II (3-2), the pressure gauge II (4-2), a temperature gauge I (5-1), the porous pore plate I (6-1), the temperature gauge II (5-2) and a water return pipeline; the second branch is sequentially connected with a flowmeter III (3-3), a pressure gauge III (4-3), a thermometer III (5-3), a porous orifice plate II (6-2), a thermometer IV (5-4) and a water return pipeline; the water return pipeline is connected with the mixed reaction tank (10).
2. The hydrodynamic cavitation device based on the parallel orifice plates as claimed in claim 1, wherein a third branch is arranged in front of the flowmeter I (3-1) on the main pipeline (2), and the third branch is sequentially connected with a thermometer V (5-5), a pressure gauge IV (4-4), a butterfly valve I (7-1) and a water return pipeline.
3. The hydrodynamic cavitation device of claim 2, wherein the orifices of the first (6-1) and the second (6-2) porous plates are circular, the angle of the orifices is flat, the number of the orifices is 1-10, the thickness of the porous plate is 2.0-6.0mm, the radius of each orifice is 1.0-2.0mm, and the area of the distribution area of the orifices is 3.0-14mm 2 The orifices are arranged radially on the orifice plate.
4. The hydrodynamic cavitation device based on the parallel orifice plate of claim 3 is characterized in that the mixing reaction tank (10) is connected with the hot water storage tank (11) through a pipeline, a butterfly valve II (7-2) is arranged on the pipeline, a drain pipe is arranged at the lower end of the hot water storage tank (11), and an adjusting switch (9-2) is arranged on the drain pipe.
5. The hydrodynamic cavitation device based on the parallel orifice plate of claim 4 is characterized in that the mixing reaction tank (10) is connected with a water source through a pipeline, and a water replenishing switch (9-1) is arranged on the pipeline.
6. The application of the parallel orifice plate-based hydrodynamic cavitation device in degrading dye-containing wastewater as set forth in any one of claims 1 to 5, characterized in that the method is as follows: the method comprises the steps of placing waste water containing dye into a mixed reaction tank (10), starting a self-priming pump (12), enabling the waste water containing the dye to return to the mixed reaction tank (10) through a flow meter I (3-1), a pressure gauge I (4-1), a first branch, a second branch and a water return pipeline, and performing water conservancy cavitation on the waste water containing the dye when the waste water passes through a porous orifice plate I (6-1) and a porous orifice plate II (6-2) in the first branch and the second branch.
7. Use according to claim 6, wherein the dye is methyl violet.
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| CN103864161A (en) * | 2014-04-04 | 2014-06-18 | 上海海事大学 | Device for producing hydrodynamic cavitation by using tapered pore plate to inactivate microorganisms in water |
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| CN103864161A (en) * | 2014-04-04 | 2014-06-18 | 上海海事大学 | Device for producing hydrodynamic cavitation by using tapered pore plate to inactivate microorganisms in water |
| US20190127671A1 (en) * | 2017-10-27 | 2019-05-02 | Cavitation Technologies, Inc. | Method and device for producing of high quality alcoholic beverages |
| CN213475471U (en) * | 2020-08-03 | 2021-06-18 | 辽宁大学 | Parallel porous venturi tube hydrodynamic cavitation wastewater treatment system |
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