CN114247436B - High-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration method and device - Google Patents
High-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration method and device Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 326
- 238000011069 regeneration method Methods 0.000 title claims abstract description 126
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 63
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 48
- 230000003647 oxidation Effects 0.000 title claims abstract description 42
- 238000005554 pickling Methods 0.000 title claims abstract description 41
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 21
- 238000001179 sorption measurement Methods 0.000 description 16
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- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
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- HEFNNWSXXWATRW-UHFFFAOYSA-N Ibuprofen Chemical compound CC(C)CC1=CC=C(C(C)C(O)=O)C=C1 HEFNNWSXXWATRW-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3441—Regeneration or reactivation by electric current, ultrasound or irradiation, e.g. electromagnetic radiation such as X-rays, UV, light, microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
- B01J20/3466—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase with steam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
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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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- 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
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Abstract
The invention belongs to the technical field of environmental protection equipment, and particularly relates to a high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration method and device. The device comprises a pretreatment tank, a high-pressure steam generator, an ultrasonic regeneration device and a wastewater advanced oxidation treatment tank. Compared with the prior art, the invention has the beneficial effects that: (1) According to the invention, the high-efficiency regeneration of the activated carbon can be realized by sequentially carrying out pretreatment, acid washing and high-temperature high-pressure treatment under ultrasonic conditions, and the regeneration rate of the activated carbon can reach more than 90%; (2) The waste liquid treated by the method and the organic pollutants removed from the activated carbon are removed through advanced oxidation reaction, so that the activated carbon cleaning and regenerating process is realized, and the waste water after the pollutants are degraded finally reaches the standard to be discharged, thereby being environment-friendly.
Description
Technical Field
The invention relates to an active carbon regeneration device, in particular to a high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration method and device.
Background
The active carbon is an amorphous carbonaceous material with stable chemical property, developed pore structure and huge specific surface area. Because of its strong adsorption performance, activated carbon is widely used in the fields of chemical industry, environmental protection, food and pharmacy, hydrometallurgy, catalyst carrier, motor material, military chemistry protection, etc. In recent years, the use amount of the active carbon in China is greatly increased, and the waste active carbon cannot be scientifically and effectively recycled, so that the waste active carbon is treated and disposed of as dangerous waste for a long time, and the waste of carbon resources and the pollution to the environment are caused. Therefore, the recycling of the waste activated carbon is beneficial to saving resources and protecting the environment, and has practical significance and research value. The regeneration is to regenerate the inactive active carbon by physical or chemical method, remove the adsorbate, release the adsorption site and recover the adsorption property to recycle.
There are many methods for regenerating activated carbon at present, and the regeneration methods are classified into 3 major categories according to main regeneration means: physical regeneration, chemical regeneration, biological regeneration. The physical regeneration method is to break the level between the adsorbents by means of temperature change, pressure change or solvent extraction or the like or decompose macromolecular organic matters into micromolecular organic matters and then separate the micromolecular organic matters so as to realize the regeneration of the activated carbon. The chemical regeneration method is a method for regenerating by means of chemical reaction, chemical degradation and the like of a regeneration medium and adsorbed organic matters, and comprises acid-base regeneration, electrochemistry, oxidation regeneration and the like. The biological regeneration method is to inoculate a microorganism onto a SAC and regenerate the SAC by degradation of the microorganism. The invention selects a high-pressure steam ultrasonic regeneration method to regenerate the active carbon from the analysis of regeneration time, efficiency and efficiency after regeneration and universality.
Chinese patent CN102989435A discloses a method for regenerating activated carbon, which is characterized in that the method mainly comprises adding acid into deactivated activated carbon, mixing uniformly, and heating and regenerating the activated carbon in a vacuum heating device. The method can generate a large amount of energy consumption under the vacuum condition, and has low economic benefit.
The ultrasonic active carbon regenerating method and device disclosed in Chinese patent CN101590398B adopts physical regenerating method, and describes that the active carbon after water washing is treated by ultrasonic in water for continuous regenerating process. An ultrasonic on-line regeneration active carbon filter and an active carbon regeneration method thereof disclosed in Chinese patent CN102974138B adopt a physical regeneration method, and describe that active carbon is firstly subjected to forward washing and back washing, then steam is introduced to heat water in the filter, and then ultrasonic regeneration treatment is carried out. The methods not only can not thoroughly clean the activated carbon, but also can produce a large amount of wastewater containing pollutants.
The Chinese patent publication No. CN103846080A discloses an active carbon regeneration method, which adopts a method of combining chemical solution regeneration and ultrasonic regeneration, and avoids the defect of incomplete chemical solution regeneration. The method mainly comprises the following steps: mixing the waste active carbon to be regenerated with a specific regeneration solvent; performing ultrasonic treatment; performing solid-liquid separation after ultrasonic treatment, and recycling the regenerated solvent; washing and suction filtering the separated active carbon; naturally airing the obtained active carbon to finish the regeneration process. However, this method only transfers the contaminants from the activated carbon into the solvent, and does not achieve the purpose of completely removing the contaminants; and the regenerated solvent contains a large amount of pollutants, which is easy to cause secondary pollution.
Disclosure of Invention
The invention aims to solve the problem of providing the high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration method and device which are efficient, small in carbon loss, simple and convenient to operate and wide in application prospect.
The technical scheme provided by the invention is as follows.
The invention provides a high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration device, which comprises a pretreatment tank, an active carbon regeneration tank, a high-pressure steam generator, an ultrasonic generator and a waste liquid advanced oxidation processor, wherein the pretreatment tank is connected with the high-pressure steam generator; the pretreatment tank is connected with the activated carbon regeneration tank through an activated carbon inlet valve, the upper part of the activated carbon regeneration tank is provided with a pickling solution inlet valve, the pickling solution inlet valve is connected with a pickling solution storage tank, the acidic cleaning solution enters the tank body of the activated carbon regeneration tank through the pickling solution inlet valve, the middle part of the activated carbon regeneration tank is horizontally provided with two fixed filter plates, the ultrasonic generator is arranged between the two fixed filter plates, activated carbon particles which are pretreated by the pretreatment tank and need to be regenerated enter the tank body between the two fixed filter plates, the activated carbon regeneration tank is provided with a pressure gauge for detecting the pressure in the tank body and a thermometer for detecting the temperature in the tank body, and the lower part of the activated carbon regeneration tank is provided with an activated carbon discharge valve for discharging regenerated activated carbon; the high-pressure steam generator is used for continuously generating high-temperature high-pressure steam, the high-pressure steam generator is connected with the active carbon regeneration tank through a high-pressure steam inlet valve, the top of the active carbon regeneration tank is connected with the steam condenser through a steam outlet valve, the steam condenser is connected with the waste liquid advanced oxidation processor through a treatment liquid inlet valve, and the bottom of the active carbon regeneration tank is connected with the waste liquid advanced oxidation processor through a waste liquid outlet valve, a treatment liquid inlet valve.
In the invention, in a pretreatment tank, the active carbon and graphite to be regenerated are mixed according to the mass ratio of 40: 1-20: 1, mixing and preprocessing.
In the invention, the pH value of the acidic cleaning solution is 3-5.
In the invention, the tank body of the active carbon regeneration tank is of a double-layer structure, and a sound absorption and heat insulation material filler is arranged between the inner wall and the outer wall of the active carbon regeneration tank.
In the invention, the ultrasonic generator is arranged on a central rotating bearing, and the central rotating bearing is driven by a motor; the number of the ultrasonic generators is 4-16, the ultrasonic frequency can be adjusted to be 25-45KHz, and the power of a single ultrasonic generator is 25-400W.
In the invention, the pressure range generated by the high-pressure steam generator is 5-13 MPa.
In the invention, zero-valent iron/expanded graphite material is arranged in a waste liquid advanced oxidation processor.
The invention also provides a high-grade oxidation activated carbon regeneration method based on the device, which comprises the following steps:
Firstly, fully mixing the activated carbon to be regenerated and graphite in an activated carbon pretreatment tank for pretreatment, and then enabling the activated carbon to be regenerated to enter the activated carbon regeneration tank through an activated carbon inlet valve by utilizing the water pressure and the gravity action in the activated carbon pretreatment tank;
Secondly, closing an activated carbon inlet valve, opening a pickling solution inlet valve, injecting acid cleaning solution in a pickling solution storage tank into an activated carbon regeneration tank through the pickling solution inlet valve, pickling the activated carbon to be regenerated, and opening a waste liquid outlet valve and a treatment solution inlet valve after pickling is finished to discharge sewage to waste liquid advanced oxidation treatment;
After the pickling is finished, closing an activated carbon inlet valve, an activated carbon discharging valve, a waste liquid discharging valve and a pickling liquid inlet valve, opening a high-pressure steam generator to generate high-pressure steam, opening the high-pressure steam inlet valve to enable the steam to enter an activated carbon regeneration tank, opening an ultrasonic generator, heating the waste activated carbon by the steam, and simultaneously desorbing pollutants by utilizing ultrasonic high pressure, wherein cavitation is generated between the pollutants and water steam on the activated carbon under the conditions of ultrasonic waves and high temperature and high pressure, and the transfer of electrons is accelerated by graphite, so that the degradation and desorption of the pollutants are realized;
And fourthly, continuously introducing steam, when the pressure gauge exceeds a certain pressure, automatically stopping steam supply, opening a steam outlet valve to release pressure, closing the steam outlet valve when the pressure gauge of the tank body shows that the pressure is lower than a minimum value, automatically opening the high-pressure steam generator, condensing the released steam through a steam condenser, entering a waste liquid advanced oxidation processor, opening a waste liquid discharge valve and a treatment liquid inlet valve after the regeneration of the activated carbon is finished, discharging waste liquid generated in the process into the waste liquid advanced oxidation processor, and enabling pollutants in the waste liquid to undergo advanced oxidation reaction to be removed, thereby realizing the clean regeneration process of the activated carbon, and finally realizing standard-reaching discharge of the waste water after the pollutants are degraded.
In the invention, in the step (one), the activated carbon and graphite to be regenerated are in a pretreatment tank (22) according to the mass ratio of 40: 1-20: 1, mixing and preprocessing.
In the invention, in the step (II), the pH value of the acid cleaning liquid is between 3 and 5, and the zero-valent iron/expanded graphite catalyst material is arranged in the waste liquid advanced oxidation processor.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the high-efficiency regeneration of the activated carbon can be realized by sequentially carrying out pretreatment, acid washing and high-temperature high-pressure treatment under ultrasonic conditions, and the regeneration rate of the activated carbon can reach more than 90%;
(2) The waste liquid treated by the method and the organic pollutants removed from the activated carbon are removed through advanced oxidation reaction, so that the activated carbon cleaning and regenerating process is realized, and the waste water after the pollutants are degraded finally reaches the standard to be discharged, thereby being environment-friendly;
(3) The method regenerates the active carbon through the high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration device, has low regeneration energy consumption in the active carbon regeneration process, can save a large amount of water resources, reduces the risk of secondary pollution caused by pollutants, and has good economic benefit.
Drawings
FIG. 1 is a schematic diagram of the high pressure steam combined pickling ultrasonic and advanced oxidation activated carbon regeneration device of the present invention.
Fig. 2 is an XRD pattern of activated carbon before and after regeneration in example 2.
Fig. 3 is an SEM image of the waste activated carbon before treatment in example 2.
Fig. 4 is an SEM image of the activated carbon after the regeneration treatment in example 2.
FIG. 5 shows the adsorption value of methylene blue by activated carbon after the regeneration treatment in example 2.
FIG. 6 is a graph showing the breakthrough adsorption of activated carbon to toluene gas after the regeneration treatment in example 2.
Reference numerals in the drawings: 1-active carbon regeneration tank, 2-ultrasonic generator, 3-central swivel bearing, 4-regeneration tank inner wall, 5-sound absorption insulation material filler, 6-regeneration tank outer wall, 7-steam condenser, 8-waste liquid advanced oxidation processor, 9-manometer, 10-thermometer, 11-high pressure steam generator, 12-fixed filter plate, 13-motor, 14-active carbon inlet valve, 15-steam outlet valve, 16-active carbon discharge valve, 17-treatment liquid inlet valve, 18-treatment liquid discharge valve, 19-waste liquid discharge valve, 20-high pressure steam inlet valve, 21-zero valent iron/expanded graphite catalyst material, 22-pretreatment tank, 23-pickling liquid inlet valve, 24-pickling liquid storage tank.
Detailed Description
The invention is further illustrated by the following detailed description of specific embodiments, which is not intended to be limiting, but is made merely by way of example.
Example 1
The high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration device mainly comprises three parts, namely a high-pressure steam generator 11, an active carbon regeneration tank 1 and a waste liquid advanced oxidation processor device.
The first part is a high pressure steam generator 11 which can be shut down by intelligent control of the equipment according to the pressure in the activated carbon regeneration tank 1.
The second part is an activated carbon regeneration tank 1, and the inner layer material of the tank body of the activated carbon regeneration tank 1 is made of glass fiber reinforced plastic, and has the functions of corrosion resistance, acid and alkali resistance and the like. The outer layer material of the activated carbon regeneration tank body is made of high-strength stainless steel plates, the distance between the inner layer and the outer layer is 8-12cm, the middle is filled with sound absorption and heat insulation materials, generally polyurethane foam substances, the sound pollution generated by equipment is eliminated, the heat loss is reduced, and the steam condensation is reduced.
The third part is a waste liquid advanced oxidation processor 8 which adopts self-made zero-valent iron/expanded graphite as a catalyst and has the performance of efficiently degrading organic pollutants in water.
Specifically, the high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration device comprises a pretreatment tank 22, a high-pressure steam generator 11, an ultrasonic generator 2, an active carbon regeneration tank 1 and a waste liquid advanced oxidation processor 8; the pretreatment process of the pretreatment tank 22 adopts the mass ratio of 40: 1-20: 1, the active carbon and the graphite are mixed, the high-pressure steam generator 11 can continuously generate high-temperature high-pressure steam, the pressure range generated by the high-pressure steam generator 11 is 5-13 MPa, the active carbon regeneration tank 11 is divided into an inner wall 4 of a regeneration tank body and an outer wall 6 of the regeneration tank body, the middle part is a sound absorption and heat insulation material filling 5, the material of the inner wall 4 of the active carbon regeneration tank is made of glass fiber reinforced plastics (6-8 mm in thickness) and has the functions of corrosion resistance, acid and alkali resistance and the like, the outer wall 6 of the regeneration tank body is made of high-strength stainless steel plates, the middle part of the active carbon regeneration tank 1 is provided with a central rotating bearing 3 and a motor 13, a plurality of ultrasonic generators 2 which are arranged correspondingly and have adjustable ultrasonic frequencies are fixed on the central rotating bearing 3, the ultrasonic generators 2 are 4-16, the ultrasonic frequencies are adjustable to be 25-45KHz, the power of a single ultrasonic generator is 25-400W, the middle part of the active carbon regeneration tank 1 is provided with a fixed filter plate 12, and active carbon particles which need regeneration can be placed in the tank body between the fixed filter plate 12. The lower section of the activated carbon regeneration tank 1 is provided with a tank condensate recovery port valve 19. The upper tank of the activated carbon regeneration tank 11 is provided with a pressure gauge 9, a thermometer 10, a steam outlet valve 15 and a pickling solution inlet valve 23 which are connected with a pickling solution storage tank 24, detection end sensors of the pressure gauge and the thermometer are located at the middle position of the activated carbon regeneration tank 1, the pickling solution storage tank 24 is used for storing acid cleaning solution, and the pH value of the acid cleaning solution is=3-5. The high-pressure steam generator 11 is automatically turned off when the pressure gauge 9 reaches the critical pressure. And simultaneously, the steam outlet valve 15 is opened for pressure relief. When the pressure of the tank pressure gauge 9 is lower than the minimum value, the steam outlet valve 15 is closed, and the high-pressure steam generator 11 is automatically opened. The middle section of the activated carbon regeneration tank 1 is provided with an activated carbon inlet valve 14 and an activated carbon outlet valve 16. The waste liquid advanced oxidation processor 8 is internally provided with a self-made zero-valent iron/expanded graphite catalyst material 21, and is connected with a treatment liquid inlet valve 17 and a treatment liquid outlet valve 18. Self-made zero-valent iron/expanded graphite catalysis
Preparation method of the agent material :Comparison of the behavior of ZVI/carbon composites from both commercial origin and from spent Li-ion batteries and mill scale for the removal of ibuprofen in water, Journal of Environmental Management, ShuaiChen,ZixiangLi,etc.Vol. 264, 15 June 2020, 110480.
The method for regenerating the activated carbon based on the device comprises the following specific processes:
firstly, the activated carbon which needs to be regenerated and saturated in adsorption is placed in a pretreatment tank, the activated carbon and graphite are fully mixed according to the proportion (40:1-20:1), and electrons among substances can be accelerated to transfer due to the existence of graphite, so that a certain promotion effect can be achieved in the degradation process of pollutants. After pretreatment operation, the active carbon to be regenerated enters the active carbon regeneration tank 1 through the active carbon inlet valve 14 by utilizing the water pressure and the gravity action in the active carbon pretreatment tank 22, the pickling solution inlet valve 23 is opened, and the acid cleaning solution is injected into the active carbon regeneration tank 1, so that the acid cleaning is mainly used for removing impurities such as heavy metals in the active carbon, and corresponding acid conditions are provided for the subsequent pollutant degradation process. After pickling, the waste liquid discharge valve 19 is opened to discharge sewage to the waste liquid advanced oxidation processor 8, the high-pressure steam generator 11 is started to enable high-temperature and high-pressure steam (saturated steam with the temperature of 100-150 ℃) to enter the activated carbon regeneration tank 1, meanwhile, the ultrasonic generator 2 is opened, and the saturated adsorbed activated carbon starts to be desorbed and decomposed under the action of ultrasonic waves and the high-temperature and high-pressure steam. The high-temperature high-pressure steam can cause the adsorption balance of the activated carbon to the pollutants to be destroyed due to the pressure effect of the activated carbon, the desorption and analysis effect occurs at the moment, meanwhile, the cavitation effect of ultrasonic waves is utilized to accelerate the decomposition and desorption process of the pollutants, the existence of graphite accelerates the transfer of electrons, and the degradation effect of the pollutants can be realized to a certain extent. The active carbon regeneration tank 1 needs to maintain a certain pressure, when the vapor pressure in the tank exceeds a certain pressure, the high-pressure vapor generator 11 is automatically closed, the vapor outlet valve 15 is opened at the same time, the pressure relief operation is carried out, and the redundant vapor enters the vapor condenser 7 for condensation. After the regeneration of the activated carbon is completed for 1-2 hours, condensate liquid in the activated carbon regeneration tank 1 and the condensate liquid in the steam condenser 7 are introduced into the waste liquid advanced oxidation processor 8 to be mixed with pickling solution, and the mixture is subjected to advanced oxidation reaction with self-made zero-valent iron/expanded graphite material 21, so that the mixture can be subjected to advanced oxidation reaction with organic pollutants under an acidic condition, and the degradation of the organic pollutants is realized. And finally, the waste liquid generated in the regeneration process of the activated carbon is treated and then discharged after reaching the standard.
Example 2
In the actual industrial organic waste gas treatment process, an adsorption method is generally adopted for treatment, and a large amount of activated carbon saturated by adsorption is generated in the process. For convenience of research, the toluene waste gas is used for experiment to replace the volatile organic compound waste gas under laboratory conditions, and the activated carbon with saturated adsorption is obtained. An activated carbon regeneration experiment was performed by placing the activated carbon saturated with adsorption in an activated carbon regeneration tank according to example 1. And (3) carrying out regeneration energy efficiency analysis on the regenerated active carbon, and simultaneously carrying out experiments of adsorbing toluene and methylene blue. The experimental results are as follows:
By comparing and analyzing the XRD patterns (figure 2) of the activated carbon before and after regeneration, the pollutant adsorbed by the waste activated carbon can be desorbed to a certain extent through the regeneration process. Through SEM image analysis, a large amount of impurities exist on the surface of the waste activated carbon (figure 3), the activated carbon pores are blocked, the regenerated activated carbon (figure 4) has a rough and loose surface, obvious pore structures appear, the size and the number of the pores are obviously larger than those of the waste activated carbon, and the micropore structure of the regenerated waste activated carbon is obviously improved.
And (3) carrying out regeneration energy efficiency analysis on the regenerated active carbon, and simultaneously carrying out experiments for adsorbing methylene blue wastewater. As can be seen from the adsorption value (figure 5) of the activated carbon to the methylene blue, compared with the waste activated carbon, the adsorption efficiency of the regenerated activated carbon to the methylene blue is obviously improved, and the regeneration rate can reach 90.3 percent. As can be seen from the penetrating adsorption curves (figure 6) of the activated carbon and the toluene gas before and after the regeneration, the waste activated carbon has almost no adsorption removal capacity on the toluene gas of the pollutant, the penetrating time of the activated carbon after the regeneration on the toluene gas of the pollutant is obviously prolonged compared with that of the waste activated carbon, and the adsorption capacity of the activated carbon after the regeneration on the toluene gas of the pollutant is greatly recovered. Experiments show that the regenerated active carbon has good removal performance for pollutants in waste gas and waste water.
Claims (7)
1. The high-pressure steam combined pickling ultrasonic and advanced oxidation active carbon regeneration device is characterized by comprising a pretreatment tank (22), an active carbon regeneration tank (1), a high-pressure steam generator (11), an ultrasonic generator (2) and a waste liquid advanced oxidation processor (8); the pretreatment tank (22) is connected with the activated carbon regeneration tank (1) through an activated carbon inlet valve (14), a pickling solution inlet valve (23) is arranged at the upper part of the activated carbon regeneration tank (1), the pickling solution inlet valve (23) is connected with a pickling solution storage tank (24), acid cleaning solution enters the inside of the activated carbon regeneration tank (1) through the pickling solution inlet valve (23), two fixed filter plates (12) are horizontally arranged at the middle part of the activated carbon regeneration tank (1), an ultrasonic generator (2) is arranged between the two fixed filter plates (12), activated carbon particles which are pretreated by the pretreatment tank (22) and need to be regenerated enter the tank between the two fixed filter plates (12), a pressure gauge (9) for detecting the pressure inside the tank and a temperature gauge (10) for detecting the temperature inside the tank are arranged on the activated carbon regeneration tank (1), and an activated carbon discharge valve (16) for discharging regenerated activated carbon is arranged at the lower part of the activated carbon regeneration tank (1); the high-pressure steam generator (11) is used for continuously generating high-temperature high-pressure steam, the high-pressure steam generator (11) is connected with the active carbon regeneration tank (1) through a high-pressure steam inlet valve (20), the top of the active carbon regeneration tank (1) is connected with the steam condenser (7) through a steam outlet valve (15), the steam condenser (7) is connected with the waste liquid advanced oxidation processor (8) through a treatment liquid inlet valve (17), and the bottom of the active carbon regeneration tank (1) is connected with the waste liquid advanced oxidation processor (8) through a waste liquid outlet valve (19), a treatment liquid inlet valve (17); wherein:
In the pretreatment tank (22), the active carbon and graphite to be regenerated are mixed according to the mass ratio of 40: 1-20: 1, mixing and preprocessing;
the waste liquid advanced oxidation processor (8) is provided with a zero-valent iron/expanded graphite material (21).
2. The advanced oxidation activated carbon regeneration device according to claim 1, wherein the pH value of the acidic cleaning liquid is 3 to 5.
3. The advanced oxidation activated carbon regeneration device according to claim 1, wherein the tank body of the activated carbon regeneration tank (1) has a double-layer structure, and a sound absorption and heat insulation material filler (5) is arranged between the inner wall and the outer wall of the tank body.
4. Advanced oxidation activated carbon regeneration device according to claim 1, characterized in that the sonotrode (2) is arranged on a central rotating bearing (3), the central rotating bearing (3) being driven by a motor (13); the number of the ultrasonic generators (2) is 4-16, the ultrasonic frequency can be adjusted to 25-45KHz, and the power of a single ultrasonic generator is 25-400W.
5. The advanced oxidation activated carbon regeneration device according to claim 1, wherein the pressure generated by the high-pressure steam generator (11) ranges from 5 mpa to 13mpa.
6. A method for regenerating advanced oxidation activated carbon based on the apparatus of claim 1, characterized in that: the regeneration is carried out according to the following steps:
Firstly, fully mixing the activated carbon to be regenerated and graphite in an activated carbon pretreatment tank (22) for pretreatment, opening an activated carbon inlet valve (14), and enabling the activated carbon to be regenerated to enter an activated carbon regeneration tank (1) by utilizing the water pressure and gravity in the activated carbon pretreatment tank (22);
(II) closing an activated carbon inlet valve (14), opening a pickling solution inlet valve (23), injecting acid cleaning solution in a pickling solution storage tank (24) into an activated carbon regeneration tank (1) through the pickling solution inlet valve (23), pickling activated carbon to be regenerated, and opening a waste liquid discharge valve (19) and a treatment solution inlet valve (17) after pickling is finished to discharge sewage to a waste liquid advanced oxidation processor (8);
After pickling, closing an activated carbon inlet valve (14), an activated carbon discharging valve (16), a waste liquid discharging valve (19) and a pickling liquid inlet valve (23), opening a high-pressure steam generator (11) to generate high-pressure steam, opening a high-pressure steam inlet valve (20) to enable the steam to enter an activated carbon regeneration tank (1), opening an ultrasonic generator (2), heating the waste activated carbon by the steam, and simultaneously utilizing ultrasonic high-pressure desorption of pollutants, wherein cavitation of the pollutants and the steam on the activated carbon occurs under the conditions of ultrasonic waves and high temperature and high pressure, and the existence of graphite accelerates the transfer of electrons to realize the degradation and desorption of the pollutants;
And fourthly, continuously introducing steam, when the pressure gauge (9) exceeds a certain pressure, automatically stopping steam supply by the high-pressure steam generator (11), opening a steam outlet valve (15) to release pressure, closing the steam outlet valve (15) when the pressure of the tank body pressure gauge (9) is lower than a minimum value, automatically opening the high-pressure steam generator (11), condensing the released steam through the steam condenser (7), entering a waste liquid advanced oxidation processor (8), opening a waste liquid outlet valve (19) and a treatment liquid inlet valve (17) after the regeneration of the activated carbon is finished, discharging waste liquid generated in the process into the waste liquid advanced oxidation processor (8), and enabling pollutants in the waste liquid to undergo advanced oxidation reaction to be removed, thereby realizing the cleaning and regeneration process of the activated carbon, and finally realizing standard discharge of the waste water after the pollutants are degraded.
7. The method for regenerating an advanced oxidation activated carbon according to claim 6, wherein in the step (two), the pH of the acidic cleaning solution is between 3 and 5.
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