CN112604653A - Active carbon in-situ modification method for imidacloprid wastewater adsorption - Google Patents
Active carbon in-situ modification method for imidacloprid wastewater adsorption Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 101
- 239000002351 wastewater Substances 0.000 title claims abstract description 61
- 239000005906 Imidacloprid Substances 0.000 title claims abstract description 43
- YWTYJOPNNQFBPC-UHFFFAOYSA-N imidacloprid Chemical compound [O-][N+](=O)\N=C1/NCCN1CC1=CC=C(Cl)N=C1 YWTYJOPNNQFBPC-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229940056881 imidacloprid Drugs 0.000 title claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 16
- 238000002715 modification method Methods 0.000 title claims abstract description 13
- 239000003607 modifier Substances 0.000 claims abstract description 54
- 238000005406 washing Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 5
- 238000011049 filling Methods 0.000 claims abstract description 3
- 230000004048 modification Effects 0.000 claims description 24
- 238000012986 modification Methods 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 7
- 229920000049 Carbon (fiber) Polymers 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 239000004917 carbon fiber Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- -1 nitromethylene Chemical group 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
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- 235000009496 Juglans regia Nutrition 0.000 description 1
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- 229910001431 copper ion Inorganic materials 0.000 description 1
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- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 239000002917 insecticide Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
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- 230000035515 penetration Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 229910001415 sodium 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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/306—Pesticides
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses an active carbon in-situ modification method for imidacloprid wastewater adsorption, which comprises the following steps: filling activated carbon into an adsorption bed to form an activated carbon bed layer, continuously and circularly introducing a modifier from the bottom of the adsorption bed to modify the activated carbon, and washing with clear water until the pH value of a washing liquid is 6.5-7 to obtain modified activated carbon; the modifier is one of nitric acid, sulfuric acid or ammonium persulfate solution with the concentration of 1-2 mol/L, and the Reynolds number of the flowing modifier in the adsorption bed is 15-30. The invention also discloses a method for adsorbing and purifying imidacloprid wastewater by using the modified activated carbon, wherein the imidacloprid wastewater is introduced into the adsorption bed from the bottom of the adsorption bed at normal temperature and normal pressure, passes through the modified activated carbon bed according to the flow of 2-10 times of the bed volume per hour, and is subjected to adsorption treatment, so that the TOC in the wastewater is less than 15 mg/kg.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and relates to an active carbon in-situ modification method for imidacloprid wastewater adsorption.
Background
Imidacloprid is a novel nitromethylene systemic insecticide, has wider market potential in the current pesticide market, but how to effectively treat pesticide wastewater troubles enterprises all the time.
The Chinese patent application CN103145302A carries out acid and alkali pretreatment on the imidacloprid wastewater after the classification and collection, and then the imidacloprid wastewater is treated by a micro-electrolysis-Fenton combined oxidation method, so that the COD of the wastewater can be reduced from 10 ten thousand mg/L to about 7000mg/L, and the removal rate of the COD is about 50-60%. The China patent application CN105905989A adopts plasma reaction to treat imidacloprid wastewater, the electric conductivity of an aqueous solution needs to be adjusted by disodium hydrogen phosphate or potassium chloride during degradation, iron ions or copper ions are added for assistance, the imidacloprid wastewater with the concentration of 1-500 mg/L can be degraded by the plasma technology, and the highest degradation rate can reach 89%. In the patent CN106268624A, 100-400 ppm imidacloprid wastewater is treated by adopting sodium ion modified bentonite, and adsorption is carried out at 40-50 ℃, so that more than 85% of organic pollutants can be removed.
The activated carbon is widely applied in the field of environmental protection, and in order to enhance the adsorption capacity of the activated carbon, modification treatment is usually carried out on the activated carbon to enhance the capacity, and the modification method of the activated carbon is usually acid treatment or alkali treatment. For example, in patent CN104014304A, a nitric acid modifier is used for treating activated carbon, the activated carbon is soaked in a nitric acid modifying solution in a standing mode, then the nitric acid modifying solution is filtered, washed and dried to obtain the nitric acid modified activated carbon, the concentration of the nitric acid modifying solution is 3-8 mol/L, ultrasonic assistance is adopted during modification, and the adsorption capacity of the modified activated carbon is improved. The Chinese patent application CN110559993A firstly carries out heat treatment on activated carbon fibers, then the carbon fibers are soaked in water and are subjected to ozone strengthening treatment, then the carbon fibers are dried at 110 ℃, then the carbon fibers are dipped for 12 to 24 hours at the temperature of 60 ℃ in equal volume by 0.05 to 0.1mol/L of ammonium persulfate, and then the carbon fibers are dried to obtain the modified carbon fibers. The method of intermittent operation is adopted during the modification of the activated carbon, so that the activated carbon is easy to break, the particle size of the activated carbon is reduced, the loss of the activated carbon is caused, and the use cost of the activated carbon is increased.
Disclosure of Invention
The invention aims to overcome the defects in the existing active carbon modification technology, and provides an in-situ active carbon modification method, which can protect active carbon and avoid the increase of use cost due to the generation of quality loss.
The purpose of the invention is realized by the following technical scheme:
an active carbon in-situ modification method for imidacloprid wastewater adsorption comprises the following steps: filling activated carbon into an adsorption bed to form an activated carbon bed layer, continuously and circularly introducing a modifier from the bottom of the adsorption bed to modify the activated carbon, washing with clear water to remove the modifier remained in the adsorption bed layer, and washing until the pH value of a washing liquid is 6.5-7 to obtain the modified activated carbon.
The two ends of the active carbon bed layer are provided with filter screens to prevent the active carbon from losing.
The average particle size of the active carbon is 0.8-1.3 mm, and the porosity of the active carbon bed layer is 0.28-0.33.
The modifier is one of nitric acid, sulfuric acid or ammonium persulfate solution with the concentration of 1-2 mol/L. The water used for preparing the modifier is deionized water or washing liquid after modification, and the consumption of water can be reduced by using the washing liquid for preparing the modifier.
The modifier is stored in a modifier storage tank, and is introduced from the bottom of the adsorption bed under the action of a pump, and flows out from the upper part of the adsorption bed after the active carbon is modified, returns to the modifier storage tank, and is pumped into the adsorption bed from the bottom of the adsorption bed to form circulating flow. The total amount of the modifier circulation is 25-65 times of the total volume of the activated carbon bed layer, and the volume space velocity of the modifier introduced into the activated carbon bed layer is 60-200 h-1The modification time is 15-25 min.
The modification treatment and the washing with clear water are carried out at normal temperature and normal pressure.
The modifier is conveyed by a pump to circulate in the activated carbon bed layer, the Reynolds number of the flowing modifier in the activated carbon bed layer is controlled to be 15-30, the modifier is in a transition flow state, the relative movement speed between the modifier and the activated carbon is enhanced, the modifier in contact with the solid surface of the activated carbon is in a continuous updating state, the probability of collision between activated molecules in the modifier and the surface of the activated carbon is greatly improved, the action capacity of the modifier and the surface of the activated carbon is enhanced, and the modification time can be shortened. In the traditional equal-volume impregnation method, the modifier and the activated carbon are in a static state, no relative motion exists between the modifier and the contacted activated carbon surface, and the activated molecules in the modifier can only generate migration power through the concentration difference of the main body fluid phase and the activated molecules on the activated carbon surface, so that more modification time is needed.
The Reynolds number of the modifier in the activated carbon bed is calculated according to the following formula:
in formula (1): d is the diameter of the active carbon particles, calculated according to the average particle size of the active carbon, m; u. of0Is the empty bed flow velocity of the modifier, m/s; mu is the viscosity of the modifier, and is calculated according to 0.00085 Pa.s; epsilon is the porosity of the activated carbon bed layer, and the value range is 0.25-0.33. Re greater than 10 is transition flow.
Generally, when the pH value of water at the outlet of the adsorption bed is 6.5-7 after washing, the using amount of washing clear water is 3-10 times of the total volume of the activated carbon bed layer, and the washing time is 2-10 hours.
The invention also aims to provide a method for purifying imidacloprid wastewater by adopting modified activated carbon adsorption, wherein the imidacloprid wastewater is introduced into an adsorption bed from the bottom of the adsorption bed at normal temperature and normal pressure, passes through the modified activated carbon bed from bottom to top according to the flow rate of 2-10 times of the bed volume per hour, and after adsorption treatment, the TOC in the wastewater is less than 15mg/kg, and the TOC removal rate of the wastewater is more than 95%. The saturated adsorption capacity of the modified activated carbon can reach 18-25% of the self weight.
The imidacloprid wastewater is a distilled liquid obtained by distilling after rectification and recovery of butanone from nitrogenous heterocyclic organic wastewater in imidacloprid production. Specifically, the imidacloprid wastewater is acidic waste liquid obtained by acidifying and rectifying nitrogenous heterocyclic organic matter wastewater in imidacloprid production, and then distillate (CN111675405A) obtained by distilling the acidic waste liquid.
The total TOC in the imidacloprid wastewater (namely the distillate) is 100-500 mg/kg.
Compared with the prior art, the invention has the advantages that:
1. the invention fixes the active carbon in the adsorption bed for in-situ modification, does not need to move the active carbon in the modification process, can avoid the quality loss of granular active carbon caused by crushing and powdering the active carbon particles after the dipping treatment by external force in the migration process, can avoid the increase of the usage amount of the active carbon and reduce the use cost, and the modifier can be recycled, reduces the discharge of modified wastewater and has good environmental and economic benefits.
2. The modifier and the clean water are introduced from the bottom, and no channeling is formed. By controlling the Reynolds number of the modifier in the adsorption bed layer, the mass transfer efficiency of the surface of the activated carbon can be enhanced, the modification is accelerated, the modification time is shortened, and the efficiency is improved.
3. The in-situ modification can be carried out at normal temperature and normal pressure, the traditional heating modification and the subsequent drying process are eliminated, the heat energy consumption is reduced, and the preparation cost of the modified active carbon is saved.
4. The saturated adsorption capacity of the modified activated carbon is greatly improved, the use amount can be effectively reduced, and the wastewater treatment cost is reduced.
5. The invention is suitable for the wastewater adsorption treatment process of continuous adsorption and continuous regeneration.
Drawings
FIG. 1 is a schematic process flow diagram of the active carbon in-situ modification method for imidacloprid wastewater adsorption.
FIG. 2 is a comparison graph of penetration curves of imidacloprid wastewater adsorption before and after activated carbon modification.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1, activated carbon is filled in an adsorption bed 1 to form an activated carbon bed layer, and filter screens are arranged at the upper end and the lower end of the activated carbon bed layer; all valves in the system were closed prior to the activated carbon modification. Preparing 1-2 mol/L modifier in a modifier storage tank 2, starting stirring, opening a first valve 4 and a second valve 5 after a homogeneous aqueous solution is formed, starting a modifier pump 3, introducing the modifier into an adsorption bed 1 filled with active carbon from the bottom, discharging the modifier from the top of the adsorption bed, and returning the modifier to the modifier storage tank 2 through the first valve 4. After the modification is finished, the modifier pump 3, the first valve 4 and the second valve 5 are closed, the third valve 7 and the fourth valve 8 are opened, the washing pump 6 is opened, clean water is introduced into the adsorption bed from the bottom for washing, washing liquid is collected in the washing liquid tank 9, and the washing liquid collected in the washing tank can be used for preparing the modifier. And after the pH value of the washing liquid at the outlet of the adsorption bed is increased to 6.5-7, closing the washing pump 6, the third valve 7 and the fourth valve 8 to obtain the modified activated carbon.
The imidacloprid wastewater is purified by adopting the modified activated carbon adsorption: and opening a fifth valve 12 and a sixth valve 13, opening a wastewater pump 11, introducing wastewater in the wastewater storage tank into the adsorption bed from the bottom for adsorption treatment, and discharging the water after adsorption and purification up to the standard.
The imidacloprid wastewater is low-concentration wastewater obtained by rectifying wastewater containing high-concentration nitrogen heterocyclic organic matters in imidacloprid production to recover butanone and then carrying out secondary distillation.
Example 1
20mL of ZX-100 type coconut shell activated carbon (average particle size of 1.23mm, bulk density of 0.52g/mL, porosity of activated carbon bed layer of 0.32, Jiangsu Zhuxi activated carbon Co., Ltd.) is put into an adsorption bed, the inner diameter of the adsorption bed is 6mm, and filter screens are arranged at two ends of the adsorption bed to prevent the loss of the activated carbon. Preparing 2mol/L nitric acid solution at a speed of 23mL/min (liquid phase volume space velocity of 69 h)-1) The flow of the modifier is continuously introduced into the adsorption bed from the bottom to modify the activated carbon, the cycle time of the modifier is 22min, and the Re number of the modifier in the adsorption bed layer is about 28.9. After the modification is finished, washing for 2 hours by using clear water with the volume 3 times of the total volume of the activated carbon bed layer, and at the moment, the pH value of the washing liquid at the outlet of the adsorption bed reaches 6.5.
The imidacloprid wastewater with TOC of 121mg/kg is subjected to adsorption and purification treatment by adopting the modified activated carbon, the wastewater is introduced into the adsorption bed filled with the modified activated carbon from the bottom according to the flow of 60mL/h, the TOC at the outlet of the adsorption bed reaches 5.2mg/kg when the adsorption bed runs for 286.5h, the TOC removal rate of the wastewater reaches 95.7%, and then the TOC removal rate is gradually increased to about 121mg/kg, and at the moment, the adsorption bed is completely penetrated. According to the experimental result, the saturated adsorption capacity of the modified activated carbon reaches 20% of the self weight of the activated carbon.
Example 2
10mL of ZX-103 type walnut shell activated carbon (average particle size of 0.88mm, bulk density of 0.54g/mL, porosity of activated carbon bed layer of 0.29, Jiangsu Zhuxi activated carbon Co., Ltd.) is put into an adsorption bed, the inner diameter of the adsorption bed is 8mm, and filter screens are arranged at two ends of the adsorption bed to prevent the loss of the activated carbon. Preparing 1mol/L sulfuric acid solution at 32mL/min (liquid phase volume space velocity of 192 h)-1) The flow of the modifier is continuously introduced into the adsorption bed from the bottom to modify the active carbon, the cycle time of the modifier is 19min, and the Re number of the modifier in the adsorption bed layer is about 19.2. Completion of modificationThen, the mixture is washed for 10 hours by using clear water with 10 times of the total volume of the activated carbon bed layer, and the pH value of the washing liquid at the outlet of the adsorption bed reaches 6.9.
The imidacloprid wastewater with the TOC of 323mg/kg is subjected to adsorption and purification treatment by adopting the modified activated carbon, the wastewater is introduced into the modified activated carbon adsorption bed at the flow rate of 60mL/h, the TOC at the outlet of the adsorption bed reaches 11.8mg/kg when the activated carbon adsorption bed runs for 50.2h, the TOC removal rate of the wastewater reaches 96.3 percent, and then the TOC removal rate is gradually increased to about 323mg/kg, and at the moment, the adsorption bed is completely penetrated. According to the experimental result, the saturated adsorption capacity of the modified activated carbon reaches 18 percent of the self weight of the activated carbon.
Example 3
15mL of ZX-200 type fruit shell activated carbon (average particle size of 1.13mm, bulk density of 0.45g/mL, porosity of activated carbon bed layer of 0.30, Jiangsu Zhuxi activated carbon Co., Ltd.) is put into an adsorption bed, the inner diameter of the adsorption bed is 6mm, and filter screens are arranged at two ends of the adsorption bed to prevent the loss of the activated carbon. Preparing 1.5mol/L ammonium persulfate solution at a liquid phase volume space velocity of 15mL/min (60 h)-1) The flow of the modifier is continuously introduced into the adsorption bed from the bottom to modify the active carbon, the cycle time of the modifier is 25min, and the Re number of the modifier in the adsorption bed layer is about 16.8. After the modification is finished, the mixture is washed for 5 hours by using clear water with 3 times of the total volume of the activated carbon, and the pH value of the washing liquid at the outlet of the adsorption bed reaches 6.6.
The imidacloprid wastewater with the TOC of 465mg/kg is purified by adopting the modified activated carbon adsorption of the embodiment, the wastewater is introduced into the modified activated carbon adsorption bed at the flow rate of 120mL/h, as shown in FIG. 2, when the operation lasts for 27.8h, the TOC at the outlet of the adsorption bed reaches 13.2mg/kg, the TOC removal rate of the wastewater reaches 97.2%, and then the TOC removal rate is gradually increased to about 464mg/kg, at this time, the adsorption bed is completely penetrated. According to the experimental result, the saturated adsorption capacity of the modified activated carbon reaches 23 percent of the self weight of the activated carbon.
Comparative example 1
15mL of ZX-200 type fruit shell activated carbon (average particle size of 1.13mm, bulk density of 0.45g/mL, porosity of activated carbon bed layer of 0.30, Jiangsu Zhuxi activated carbon Co., Ltd.) is put into an adsorption bed, the inner diameter of the adsorption bed is 6mm, and filter screens are arranged at two ends of the adsorption bed to prevent the loss of the activated carbon. Washing with clear water 3 times the total volume of the activated carbon for 5h, wherein the pH of the washing liquid at the outlet of the adsorption bed reaches 7.8.
The imidacloprid wastewater with the TOC of 465mg/kg in example 3 is introduced into an activated carbon adsorption bed washed only by clean water at the flow rate of 120mL/min, when the operation lasts for 17.7h, the TOC at the outlet of the adsorption bed reaches 25.7mg/kg, the TOC removal rate of the wastewater reaches 94.5 percent, and then the TOC removal rate gradually rises to about 464mg/kg, and at the moment, the adsorption bed is completely penetrated. According to the experimental result, the saturated adsorption capacity of the activated carbon reaches 14.5 percent of the self weight of the activated carbon. Comparison of the breakthrough curves of comparative example 1 and example 3 as shown in fig. 2 shows that the adsorption capacity of the modified activated carbon is improved by 58.6%.
Claims (10)
1. An active carbon in-situ modification method for imidacloprid wastewater adsorption is characterized by comprising the following steps: filling activated carbon into an adsorption bed to form an activated carbon bed layer, continuously and circularly introducing a modifier from the bottom of the adsorption bed to modify the activated carbon, and washing with clear water until the pH value of a washing liquid is 6.5-7 to obtain the modified activated carbon.
2. The in-situ modification method of activated carbon for adsorbing imidacloprid wastewater according to claim 1, characterized in that the modifier is one of nitric acid, sulfuric acid or ammonium persulfate solution with the concentration of 1-2 mol/L.
3. The method for in-situ modification of activated carbon for imidacloprid wastewater adsorption according to claim 1, which is characterized in that under the action of a pump, a modifier is introduced from the bottom of an adsorption bed, and the modified activated carbon flows out from the upper part of the adsorption bed and is pumped into the adsorption bed from the bottom of the adsorption bed to form circulating flow.
4. The active carbon in-situ modification method for imidacloprid wastewater adsorption according to claim 1, characterized in that the total amount of the modifier cycle is 25-65 times of the volume of the active carbon bed, and the volume space velocity of the modifier introduced into the active carbon bed is 60-200 h-1The modification time is 15-25 min.
5. The in-situ modification method of activated carbon for adsorbing imidacloprid wastewater as claimed in claim 1, wherein the Reynolds number of the flowing modifier in an adsorption bed is 15-30.
6. The method for in-situ modification of activated carbon for adsorption of imidacloprid wastewater as claimed in claim 1, wherein the modification treatment is carried out at normal temperature and pressure.
7. The in-situ modification method of activated carbon for adsorbing imidacloprid wastewater according to claim 1, which is characterized in that the average particle size of the activated carbon is 0.8-1.3 mm, and the porosity of an activated carbon bed layer is 0.28-0.33.
8. A method for adsorbing and purifying imidacloprid wastewater by using the modified activated carbon prepared by any one of claims 1 to 7 is characterized in that the imidacloprid wastewater is introduced into an adsorption bed from the bottom of the adsorption bed at normal temperature and normal pressure, passes through a modified activated carbon bed from bottom to top according to the flow rate of 2-10 times of the volume of the bed per hour, and the TOC in the wastewater is less than 15mg/kg after adsorption treatment.
9. The method for adsorbing, purifying and treating imidacloprid wastewater by using the modified activated carbon as claimed in claim 8, wherein the imidacloprid wastewater is a distilled liquid obtained by distillation treatment after rectification and butanone recovery of nitrogen heterocyclic organic wastewater in imidacloprid production.
10. The method for adsorbing, purifying and treating imidacloprid wastewater by using modified activated carbon as claimed in claim 8, wherein the total TOC in the imidacloprid wastewater is 100-500 mg/kg.
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| CN113083261A (en) * | 2021-05-24 | 2021-07-09 | 南昌师范学院 | Modification method of activated carbon fiber material |
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