CN112337450A - Method for regenerating powdered activated carbon by micro-nano bubbles - Google Patents
Method for regenerating powdered activated carbon by micro-nano bubbles Download PDFInfo
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- 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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- 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
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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
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
Abstract
The invention discloses a method for regenerating powdered activated carbon by micro-nano bubbles, which relates to the field of activated carbon regeneration, and specifically comprises the following steps: (1) putting the inactivated activated carbon into a reactor of a micro-nano bubble device, adding a cleaning solution, and adjusting the pH value of the cleaning solution; (2) and (3) starting the micro-nano bubble device, introducing the cleaning liquid and the gas into a gas-liquid mixing pump simultaneously for mixing, generating micro-nano bubbles to generate active treatment on the inactivated active carbon in the reactor, stopping the micro-nano bubble device, precipitating, filtering and drying to obtain the micro-nano bubble regenerated powder active carbon. The micro-nano bubble regenerated powder activated carbon is simple to operate, does not generate any harmful substances, and is favorable for industrial popularization. The invention also discloses a micro-nano bubble device, which comprises a gas-liquid mixing pump, a reactor, a gas tank and a rotary nozzle.
Description
Technical Field
The invention belongs to the field of activated carbon regeneration, and particularly relates to a method for regenerating powdered activated carbon by micro-nano bubbles.
Background
The activated carbon is a traditional artificial material, also called carbon molecular sieve, and is essentially a black porous carbonaceous substance with weak polarity after activation treatment, the pore structure of the activated carbon is highly developed, and the activated carbon has a huge specific surface area. The stable physical and chemical adsorption is achieved due to the good physical and chemical adsorption. The types of the activated carbon are divided into: powdered activated carbon, granular activated carbon and activated carbon fiber.
The powdered activated carbon has the advantages of low price, good adsorption effect, high adsorption rate and good adsorption effect on most dye pollutants. However, the powder can improve water quality and become toxic and harmful solid waste after adsorbing pollutants in water. The recycling of the waste PAC has important environmental and economic benefits and wide application prospect.
Chinese patent CN103230785A discloses a method for producing regenerated active carbon, which comprises the following key steps in sequence: putting the waste activated carbon with the water content of 50-85% into a numerical control high-temperature smoldering furnace, and heating for 3-7 hours at the temperature of 100-150 ℃; controlling a numerical control high-temperature smoldering furnace to gradually increase the temperature from 150 ℃ to 900 ℃ within 3 hours to 7 hours; introducing oxidizing gas into the numerical control high-temperature smoldering furnace for gasification reaction, controlling the temperature at 900 ℃ and 950 ℃, and keeping for 5-7 hours to obtain activated carbon; the high-temperature tail gas generated in the step is introduced into the step II again; and (3) passing the activated carbon through a water cooling treatment system, and cooling to 30 ℃ after 5 to 7 hours. Although the regenerated activated carbon obtained by the production method of the regenerated activated carbon is excellent in quality, the production method is complex and needs to be carried out under a high-temperature condition, the energy consumption is high, and meanwhile, the generated high-temperature tail gas causes energy waste, so that the regeneration cost of the activated carbon is high, and the popularization rate is low.
Disclosure of Invention
The following problems exist in the prior art: the regeneration method of the activated carbon is complex, the regeneration method needs to be carried out under a high-temperature condition, the energy consumption is high, and meanwhile, the generated high-temperature tail gas causes energy waste, so that the regeneration cost of the activated carbon is high, and the popularization rate is low.
In order to solve the above problems, the present invention is realized by the following technical solutions:
a method for regenerating powdered activated carbon by micro-nano bubbles specifically comprises the following steps:
(1) putting the inactivated activated carbon into a reactor of a micro-nano bubble device, adding a cleaning solution, and adjusting the pH value of the cleaning solution;
(2) and (3) starting the micro-nano bubble device, after the micro-nano bubbles generate to perform active treatment on the inactivated activated carbon in the reactor, stopping the micro-nano bubble device, precipitating, filtering and drying to obtain the micro-nano bubble regenerated powder activated carbon.
The micro-nano bubbles have the advantages of large specific surface area, long retention time in water, high interface zeta potential, free radical generation and the like. The bubble is broken instantaneously. The temperature and pressure of the bursting point of the cavitation bubble are increased suddenly when the cavitation bubble bursts, the local temperature can reach thousands of degrees, and the pressure can reach hundreds of atmospheric pressures. The vibration generated with the collapse enters the solution. Due to the violent change of the disappearance of the gas-liquid interface, the accumulated chemical energy is released by the high-concentration ions accumulated on the interface at one time, and a large amount of hydroxyl radicals can be generated by excitation. The hydroxyl free radical has ultrahigh oxidation-reduction potential, and the generated super-strong oxidation can degrade pollutants such as phenol and the like which are difficult to oxidize and decompose under normal conditions in water, and can rapidly degrade flushed pollutants. Therefore, the micro-nano bubbles have the characteristics of regenerated powdered activated carbon. The method for regenerating the powdered activated carbon by the micro-nano bubbles is simple to operate, does not generate any harmful substance, and is favorable for industrial popularization.
Further, the method also comprises the step (3) of detecting the adsorption capacity and the regeneration rate of the regenerated powdered activated carbon.
The method for detecting the adsorption capacity and the regeneration rate of the regenerated powdered activated carbon in the step (3) specifically comprises the following steps: respectively placing equivalent regenerated activated carbon and new activated carbon in the wastewater of methyl orange with the same concentration, oscillating, adsorbing at normal temperature for the same time, and measuring the concentration of the methyl orange in the wastewater to obtain corresponding adsorption capacity, wherein the regeneration rate is the ratio of the adsorption capacity of the regenerated activated carbon to the adsorption capacity of the new activated carbon.
Preferably, the pH value of the cleaning solution is 3-12.
Preferably, the temperature of the cleaning liquid is 20-40 ℃.
Preferably, the cleaning liquid is water or a sulfate aqueous solution.
Preferably, the sulfate solution is 5g/L to 15g/L of an aqueous sodium sulfate solution.
As the mass concentration of the electrolyte sodium sulfate is increased, the conductivity of the solution is increased, and cations which are beneficial to the adsorption of the surface of the activated carbon are diffused to the surface of the cavitation bubbles from the solution and are removed.
A micro-nano bubble device comprises a gas-liquid mixing pump, a reactor, a gas tank and a rotary nozzle;
the gas tank outlet is connected to the gas inlet of the gas-liquid mixing pump through a pipeline, the reactor outlet is connected to the liquid inlet of the gas-liquid mixing pump through a pipeline, the rotary sprayer is arranged in the cleaning liquid of the reactor, a gas-liquid pipe is arranged on the gas-liquid mixing pump, and the gas-liquid pipe penetrates through the reactor and is communicated to the inlet end of the rotary sprayer.
During the use, at first, in supplementing the gas tank with the gas that needs to use, place activated carbon powder in the reactor, add the washing liquid into the reactor, control rotatory nozzle arranges inside the washing liquid in, ensure that the microbubble that rotatory nozzle produced can wash the activated carbon, during operation, the washing liquid suction of gas-liquid mixing pump in with the reactor is to the pump body in, simultaneously with the gas suction of gas tank in to the pump body, gas and washing liquid mix the back in the gas-liquid mixing pump, spout micro-nano bubble and regenerate the inactive activated carbon in the reactor in transporting rotatory nozzle through the gas-liquid pipe.
The method for regenerating the powdered activated carbon by using the micro-nano bubbles can be implemented by using the micro-nano bubble device, but is not limited to the micro-nano bubble device, and any micro-nano bubble device which can achieve the same effect in the prior art can be used for regenerating the powdered activated carbon.
Preferably, a gas flowmeter is arranged at a gas inlet of the gas-liquid mixing pump, and a liquid flowmeter is arranged at a liquid outlet of the gas-liquid mixing pump.
Preferably, the air inflow of the gas-liquid mixing pump is 0.8-1.2L/min, the liquid flow is 18-20L/min, and the gas-liquid ratio is controlled to be 1:12-1: 18.
The invention has the following beneficial effects:
(1) the method for regenerating the powdered activated carbon by the micro-nano bubbles utilizes the violent change of disappearance of a gas-liquid interface when the bubbles collapse, and high-concentration ions accumulated on the interface release accumulated chemical energy at one time, so that a large amount of hydroxyl radicals can be generated by excitation. The hydroxyl free radical has ultrahigh oxidation-reduction potential, and the generated super-strong oxidation action can degrade pollutants which are difficult to oxidize and decompose in water under normal conditions, such as phenol and the like, and can rapidly degrade flushed pollutants, so that the activated carbon powder is regenerated. The micro-nano bubble regenerated powder activated carbon is simple to operate, does not generate any harmful substances, and is favorable for industrial popularization.
(2) The invention selects the sodium sulfate aqueous solution as the cleaning solution, compared with the method using water as the cleaning solution, the electrolyte concentration in the sodium sulfate aqueous solution is high, the conductive capacity of the solution is increased, and cations which are beneficial to the adsorption of the surface of the activated carbon are diffused to the surface of the cavitation bubbles from the solution and are removed.
(3) The micro-nano bubble device is simple in equipment, the gas-liquid mixing ratio is effectively monitored and controlled through the values of the gas flowmeter and the liquid flowmeter, the gas-liquid mixing is ensured to be in a certain proper range, and the particle size and the retention time of micro-nano bubbles are suitable for the regeneration of powdered activated carbon.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a micro-nano bubble device according to the present invention;
FIG. 2 is a graph of pH versus regeneration rate of the powder;
FIG. 3 is a graph of temperature value versus powder regeneration rate variation;
FIG. 4 is a graph showing the change in the concentration of an aqueous solution of a sulfate salt versus the regeneration rate of the powder;
FIG. 5 is a graph of gas species versus powder regeneration rate variation;
labeled as: 1-gas-liquid mixing pump; 2-a reactor; 3-a gas tank; 4-rotating the spray head; 5-gas-liquid tube; 51-pressure gauge; 6-gas flow meter; 7-liquid flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or circuit connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Example 1
As shown in fig. 1, a micro-nano bubble device comprises a gas-liquid mixing pump 1, a reactor 2, a gas tank 3 and a rotary nozzle 4;
the outlet of the gas tank 3 is connected to the inlet of the gas 1 of the gas-liquid mixing pump through a pipeline, the outlet of the reactor 2 is connected to the inlet of the liquid 1 of the gas-liquid mixing pump through a pipeline, the rotary spray head 3 is arranged in the cleaning liquid of the reactor 2, the outlet of the gas-liquid mixing pump 1 is provided with a gas-liquid pipe 5, and the gas-liquid pipe 5 penetrates through the reactor and is communicated to the inlet end of the rotary spray head 4.
During the use, at first, in supplementing gas tank 3 with needs use, place activated carbon powder in reactor 2, to adding the washing liquid in reactor 2, control rotatory nozzle 4 arranges inside the washing liquid in, ensure that the microbubble that rotatory nozzle 4 produced can wash the activated carbon, during operation, gas-liquid mixing pump 1 is with the washing liquid suction in reactor 2 to the pump body in, simultaneously with the gas suction in the gas tank 3 to the pump body in, gas and washing liquid mix in gas-liquid mixing pump 1 after, carry in rotatory nozzle 3 through gas-liquid pipe 5 micro-nano eruption bubble and regenerate the deactivation activated carbon in the reactor 2.
The gas-liquid mixing pump 1 is provided with a gas flowmeter 6 at a gas inlet, a liquid flowmeter 7 at a liquid outlet of the gas-liquid mixing pump 1, the gas-liquid mixing ratio is controlled by the values of the gas flowmeter 6 and the liquid flowmeter 7, and a pressure gauge 51 is arranged on the gas-liquid pipe 5 for monitoring the pressure value of the gas-liquid mixture.
The size of the micro-nano bubbles can be controlled by controlling the flow ratio of the gas to the cleaning liquid, the air input of the gas-liquid mixing pump 1 is 0.8-1.2L/min, the liquid flow is 18-20L/min, and the gas-liquid ratio is controlled to be 1:12-1: 18. When control when this gas-liquid ratio within range, micro-nano bubble dwell time is about 110 and supplyes 120s, and the bubble diameter is 300 and supplyes 500nm, helps the production of micro-nano bubble more, and when surpassing this gas-liquid ratio within range, the production effect of micro-nano bubble is extremely poor, influences the regeneration effect of powder active carbon. The ratio of the gas pumping quantity of the gas-liquid mixture to the liquid flow is controlled to be 1:15, which is most suitable. The size of the bubble generation and the residence time contribute to the regeneration of the powdered activated carbon.
Example 2
Adding 20g of inactivated activated carbon into a reactor of a microbubble reaction device, adding 9L of water into the reactor, adding sulfuric acid to adjust the pH value of cleaning liquid to 3, starting a micro-nano bubble device, introducing the cleaning liquid and air into a gas-liquid mixing pump simultaneously to mix, generating micro-nano bubbles to perform activation treatment on the inactivated activated carbon in the reactor, regenerating the inactivated activated carbon by using the micro-nano bubbles for 1 hour, stopping the operation of the micro-nano bubble device, standing, precipitating, filtering, and drying to obtain regenerated powdered activated carbon.
Firstly, respectively dissolving two groups of 10mg methyl oranges into 1L of water to prepare two groups of 10mg/L methyl orange solutions, then weighing 0.2g of new activated carbon and 0.2g of regenerated powdered activated carbon, respectively adding the new activated carbon and the regenerated powdered activated carbon into the two groups of 10mg/L methyl orange solutions for adsorption, measuring the concentration of the methyl orange after 1 hour of adsorption, thereby calculating the unit adsorption amount of the activated carbon, wherein the unit adsorption amount of the activated carbon is (the amount of the methyl orange before adsorption-the amount of the methyl orange after adsorption)/the amount of the activated carbon, and finally measuring the regeneration rate of the inactivated activated carbon according to the unit adsorption amount of the activated carbon; the regeneration rate is the new carbon unit adsorption amount/regenerated carbon range adsorption amount. The regeneration rate in this example was calculated to be 46.2%.
Example 3:
the only difference from example 2 is that in this example, water is directly used as a cleaning solution, and no substance is added for pH adjustment, so that the regeneration rate of the finally obtained powdered activated carbon is 39.3%.
Example 4
The only difference from example 2 is that in this example, when sulfuric acid is added to adjust the pH of the cleaning solution to 5, the regeneration rate of the finally obtained powdered activated carbon is 39.7%.
Example 5
The only difference from example 2 is that in this example, sodium hydroxide is used to replace sulfuric acid to adjust the pH of the cleaning solution to 9, and the final regeneration rate of the powdered activated carbon is 39.4%.
Example 6
The only difference from example 2 is that in this example, sodium hydroxide is used to replace sulfuric acid to adjust the pH of the cleaning solution to 9, and the final regeneration rate of the powdered activated carbon is 40.4%.
Example 7
Adding 20g of inactivated activated carbon into a reactor of a microbubble reaction device, adding 9L of water into the reactor, adding sulfuric acid to adjust the pH value of cleaning liquid to 3, heating the cleaning liquid to 20 ℃, starting a micro-nano bubble device, introducing the cleaning liquid and air into a gas-liquid mixing pump simultaneously to mix, generating micro-nano bubbles to perform activation treatment on the inactivated activated carbon in the reactor, regenerating the inactivated activated carbon by using the micro-nano bubbles for 1 hour, stopping the operation of the micro-nano bubble device, standing, precipitating, filtering and drying to obtain regenerated powdered activated carbon.
Example 8
The only difference from embodiment 7 is that in this embodiment, the micro-nano bubble regeneration is performed after the cleaning solution is heated to 30 ℃, and the regeneration rate of the obtained powdered activated carbon is 48.1%.
Example 9
The only difference from embodiment 7 is that in this embodiment, the micro-nano bubble regeneration is performed after the cleaning solution is heated to 40 ℃, and the regeneration rate of the obtained powdered activated carbon is 51.4%.
Example 10
Adding the inactivated activated carbon into a reactor of a microbubble reaction device, adding 9L of sodium sulfate aqueous solution with the concentration of 5g/L into the reactor, adding sulfuric acid to adjust the pH value of cleaning liquid to 3, heating the cleaning liquid to 40 ℃, starting a micro-nano bubble device, introducing the cleaning liquid and air into a gas-liquid mixing pump simultaneously for mixing, generating micro-nano bubbles to perform activation treatment on the inactivated activated carbon in the reactor, regenerating the inactivated activated carbon by using the micro-nano bubbles for 1 hour, stopping the operation of the micro-nano bubble device, standing, precipitating, filtering, and drying to obtain regenerated powdered activated carbon.
Example 11
The only difference from example 10 is that the concentration of the aqueous solution of sodium sulfate in the cleaning solution in this example was 10g/L, and the regeneration rate of the finally obtained powdered activated carbon was 59.9%.
Example 12
The only difference from example 10 is that the concentration of the aqueous solution of sodium sulfate in the cleaning solution in this example was 15g/L, and the regeneration rate of the finally obtained powdered activated carbon was 63.6%.
Example 13
Adding the inactivated activated carbon into a reactor of a microbubble reaction device, adding 9L of sodium sulfate aqueous solution with the concentration of 15g/L into the reactor, adding sulfuric acid to adjust the pH value of cleaning liquid to 3, heating the cleaning liquid to 40 ℃, starting a micro-nano bubble device, introducing the cleaning liquid and ozone into a gas-liquid mixing pump simultaneously for mixing, generating micro-nano bubbles to perform activation treatment on the inactivated activated carbon in the reactor, regenerating the inactivated activated carbon by using the micro-nano bubbles for 1 hour, stopping the operation of the micro-nano bubble device, standing, precipitating, filtering, and drying to obtain regenerated powdered activated carbon.
And (3) after the inactivated activated carbon is regenerated for 1 hour by utilizing the micro-nano bubbles, stopping the operation of the micro-nano bubble device, standing, precipitating, filtering and drying to obtain regenerated powdered activated carbon.
Examples 2 to 12 all used air, and the gas used in this example was ozone prepared using oxygen. The regeneration rate of the powdered activated carbon obtained by regenerating the powdered activated carbon with ozone in this example was 89.3%.
Example 14
Unlike example 13, in this example, the gas used was oxygen, and the finally calculated regeneration rate of the powdered activated carbon was 85.4%.
Example 15
Unlike example 13, the gas used in this example was mixed ozone prepared using air, and the finally calculated regeneration rate of the powdered activated carbon was 76.02%.
Fig. 2 is a test result of the adsorption amount and the regeneration rate of activated carbon in the micro-nano bubble regenerated activated carbon of the embodiments 2-6; the only difference in the methods for regenerating the activated carbon by the micro-nano bubbles in the embodiments 2-6 is the pH value of the cleaning solution.
As shown in fig. 2, when the pH of the cleaning solution was adjusted without adding any acid or base, that is, when the cleaning solution in example 3 was water, the regeneration rate of the powdered activated carbon was the lowest, and when the pH was adjusted by adding an appropriate base or acid, the regeneration rate of the powdered activated carbon was significantly increased, indicating that the regeneration rate of the powdered activated carbon in the alkaline cleaning solution or in the acidic cleaning solution was higher than that in the neutral cleaning solution. Similarly, comparing the regeneration rate of powdered activated carbon in alkaline cleaning solution with the regeneration rate of powdered activated carbon in acidic cleaning solution, it is apparent from the graph in fig. 2 that the regeneration rate of powdered activated carbon in acidic cleaning solution is significantly higher than the regeneration rate of powdered activated carbon in alkaline cleaning solution.
The main reason is that although under acid-base conditions, free ions in the solution can enhance the regeneration effect of the micro-nano bubbles, when the pH is higher, the powdered activated carbon can adsorb hydrated hydroxide ions, the surface is negatively charged, and electrostatic repulsion is generated between the powdered activated carbon and the micro-nano bubbles. And the micro-nano bubbles are more easily gathered by the powdered activated carbon under the acidic condition. In addition, under the strong acid condition, methyl orange is in a molecular state and is easy to volatilize and enter a gas phase area, and a thermal decomposition reaction and a hydroxyl radical reaction are carried out under the high temperature and high pressure in a cavity, so that the micro-nano bubble regeneration powder activated carbon is more favorably realized.
As shown in fig. 2, the lower the pH value, the higher the regeneration rate of the powdered activated carbon, but considering that the acidity is too high, the acidic solution may affect the gas-liquid mixing pump in the micro-nano bubble device, so in the present invention, the optimum regeneration pH condition for the powdered activated carbon at the pH value of 3 is selected in combination with the powder regeneration rate and the actual situation borne by the gas-liquid mixing pump.
Fig. 3 is a test result of the adsorption amount and the regeneration rate of activated carbon in the micro-nano bubble regenerated activated carbon of the embodiments 7-9; the only difference in the methods for regenerating the activated carbon by the micro-nano bubbles in the embodiments 7 to 9 is the temperature value of the cleaning solution.
Under the condition of pH 3, as shown in fig. 3, it was found that the higher the temperature was, the higher the regeneration rate of the powdered activated carbon was. The reaction temperatures were 20 deg.C, 30 deg.C, and 40 deg.C, respectively, and the regeneration rates of the corresponding powdered carbons were 46.2%, 48.1%, and 51.4%, respectively. The main reason is that due to the increase of temperature, the irregular movement of molecules participating in the reaction in the solution is accelerated, the kinetic energy is increased, the contact chance with the active carbon is increased, and the reaction rate is accelerated.
Similarly, when the solution temperature is too high, the gas-liquid mixing pump is overheated and exceeds the load of the gas-liquid mixing pump, so that the optimal regeneration temperature condition of the powdered activated carbon at the temperature of 40 ℃ is selected according to the powder regeneration rate condition and the actual condition borne by the gas-liquid mixing pump.
Fig. 4 is a test result of the adsorption amount and the regeneration rate of activated carbon in the micro-nano bubble regenerated activated carbon of the embodiments 9-12; the only difference in the methods for regenerating activated carbon by micro-nano bubbles in the embodiments 9-12 is that the concentrations of sodium sulfate in the cleaning solution are different. In example 9, the cleaning solution was water, the sodium sulfate concentration was 0g/L, and in examples 10 to 12, the sodium sulfate concentrations were 5g/L, 10g/L and 15g/L, respectively, and it can be seen from FIG. 4 that the regeneration rate of the powdered activated carbon was increased as the mass concentration of sodium sulfate was increased. The reason is that as the mass concentration of the electrolyte sodium sulfate is increased, the conductivity of the solution is increased, and cations which are beneficial to the adsorption of the activated carbon surface are diffused to the surface of the cavitation bubbles from the solution and are removed.
Fig. 5 is a test result of the adsorption amount and the regeneration rate of activated carbon in the micro-nano bubble regenerated activated carbon of the embodiments 12-15; the only difference in the methods for regenerating activated carbon by micro-nano bubbles in examples 12 to 15 is that the gas used in the micro-nano bubble device is different. The ozone generated by oxygen is ozone prepared by directly introducing oxygen into an ozone generator, and the ozone generated by air is ozone prepared by introducing air into the ozone generator. As can be seen from fig. 5, the micro-nano bubbles generated by the ozone introduced by the oxygen have the best regeneration effect, and the regeneration rate is 89.3%; the oxygen is introduced with a secondary effect of 85.4 percent; the regeneration effect of the ozone and the air generated by the air is 76.02 percent and 63.6 percent respectively. From this, it is found that the regeneration rate of the powdered activated carbon is the highest when the gas is ozone produced by oxygen. Mainly, high-concentration ozone or pure oxygen can generate more OH to better oxidize pollutants on the surface of the powdered carbon,
although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for regenerating powdered activated carbon by micro-nano bubbles is characterized by comprising the following steps:
(1) putting the inactivated activated carbon into a reactor of a micro-nano bubble device, adding a cleaning solution, and adjusting the pH value of the cleaning solution;
(2) and (3) starting the micro-nano bubble device, introducing the cleaning liquid and the gas into a gas-liquid mixing pump simultaneously for mixing, generating micro-nano bubbles to generate active treatment on the inactivated active carbon in the reactor, stopping the micro-nano bubble device, precipitating, filtering and drying to obtain the micro-nano bubble regenerated powder active carbon.
2. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, further comprising the step (3) of detecting the adsorption capacity and the regeneration rate of the regenerated powdered activated carbon.
3. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, wherein the gas is air, oxygen or ozone.
4. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, wherein the pH value of the cleaning solution is 3-12.
5. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, wherein the temperature of the cleaning solution is 20-40 ℃.
6. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, wherein the cleaning solution is water or sulfate aqueous solution.
7. The method for regenerating powdered activated carbon by micro-nano bubbles according to claim 1, wherein the sulfate solution is 5-15 g/L sodium sulfate aqueous solution.
8. The method for regenerating powdered activated carbon by micro-nano bubbles according to any one of claims 1 to 7, wherein the micro-nano bubble device comprises a gas-liquid mixing pump, a reactor, a gas tank and a rotary nozzle;
the gas tank outlet is connected to the gas inlet of the gas-liquid mixing pump through a pipeline, the reactor outlet is connected to the liquid inlet of the gas-liquid mixing pump through a pipeline, the rotary sprayer is arranged in the cleaning liquid of the reactor, a gas-liquid pipe is arranged on the gas-liquid mixing pump, and the gas-liquid pipe penetrates through the reactor and is communicated to the inlet end of the rotary sprayer.
9. The micro-nano bubble device according to claim 8, wherein a gas flow meter is arranged at a gas inlet of the gas-liquid mixing pump, and a liquid flow meter is arranged at a liquid outlet of the gas-liquid mixing pump.
10. The micro-nano bubble device according to claim 9, wherein the gas-liquid mixing pump has a gas inflow of 0.8-1.2L/min, a liquid flow of 18-20L/min, and a gas-liquid ratio of 1:12-1: 18.
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| CN107055954A (en) * | 2017-03-30 | 2017-08-18 | 山东建筑大学 | A kind of charcoal circular form pool water cleaning systems and method |
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