CN111003744A - Activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plant - Google Patents
Activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plant Download PDFInfo
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- CN111003744A CN111003744A CN201911289119.4A CN201911289119A CN111003744A CN 111003744 A CN111003744 A CN 111003744A CN 201911289119 A CN201911289119 A CN 201911289119A CN 111003744 A CN111003744 A CN 111003744A
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
-
- 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
-
- 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
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
-
- 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
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F2101/40—Organic compounds containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention discloses an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant, which is characterized by realizing internal circulation of the activated carbon in the sewage plant and solving the problem that saturated activated carbon cannot be treated. The process has good treatment effect and can be used for treating CODcrCOD of effluent under the condition of less than or equal to 90mg/LcrThe standard of V-type water and even IV-type water on the earth surface can be achieved, the iodine value and methylene blue adsorption value of the regenerated activated carbon are slightly higher than those of fresh carbon, the mass loss is less than or equal to 8 percent, and the adsorption effect of the regenerated activated carbon is the same as that of the fresh carbon.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant.
Background
Advanced oxidation technology is currently used in large scale in sewage plants, mainly because the advanced oxidation technology utilizes the strong oxidizing property of hydroxyl radicals to oxidize and degrade refractory organic matters in sewage, but in actual operation, the advanced oxidation technology faces the following problems.
1. The ozone-based advanced oxidation technology has high production cost of ozone, an ozone generator of an oxygen source has the oxygen utilization rate of only 10 percent, and the power consumption is 7-9 degrees/kgO 3; the advanced oxidation technology based on H2O2 has low oxidation efficiency, and a part of the technology also generates a large amount of iron mud.
2. Ozone has low solubility in water, and a large amount of ozone is wasted.
3. The existence time of the hydroxyl free radical is very short, so the requirement on water distribution is high, and if the hydroxyl free radical cannot react with organic pollutants in the existence period of the hydroxyl free radical, the hydroxyl free radical can react with other substances to generate H2O.
The activated carbon adsorption technology is a technology with good development prospect, is applied to small-scale sewage plants at present, and is characterized by no addition of any chemical agent, fast adsorption, high effluent quality and low investment cost. The biggest short plate of the technology is that the activated carbon with saturated adsorption cannot be disposed, and can only be piled in a factory as dangerous waste, thereby invisibly increasing the management and operation cost. Some units solve the problem through a cooperative treatment mode, namely activated carbon is used dispersedly and regenerated uniformly, and activated carbon saturated in adsorption of each sewage plant in a certain area is transported uniformly to a specified activated carbon regeneration plant for regeneration; the method also combines a sedimentation tank with activated carbon, and the principle is to discharge the powdered activated carbon with saturated adsorption and residual sludge together, but the method also has the problems that the powdered activated carbon is difficult to settle, and the SS and the chromaticity of effluent do not reach the standard.
Disclosure of Invention
Aiming at the problem of advanced treatment of a sewage plant, the invention solves the problems in the background art through fresh carbon adsorption → saturated carbon in-situ regeneration → regenerated carbon secondary adsorption, and simultaneously proves that the sewage plant can realize advanced treatment and recycle of the activated carbon through an activated carbon in-situ cyclic adsorption regeneration process through a large number of experiments.
In order to achieve the purpose, the invention provides the following technical scheme: an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant comprises the following steps:
s1: injecting sewage in a sewage plant into an activated carbon adsorption device as raw water, wherein the hydraulic retention time is 1h, the CODcr index of raw water inflow is 60-120mg/L, and the CODcr index of raw water outflow is 20-40 mg/L;
s2: when the CODcr index value of the raw water effluent exceeds 40mg/L for three consecutive days, replacing the active carbon filler in the active carbon adsorption device;
s3, putting the activated carbon filler replaced in the step S2 into an activated carbon regeneration furnace for desorbing the impurities at high temperature for 30 minutes, wherein the temperature of the activated carbon regeneration furnace is 850 ℃ and the activated carbon regeneration furnace is in an oxygen-free state;
and S4, adding the activated carbon filler treated by the S3 into the activated carbon adsorption device in the S1 again, recycling the activated carbon filler and recycling the activated carbon filler.
Preferably, the activated carbon adsorption device is of an up-flow structure and sequentially comprises a water distribution area, a filter plate, cobblestone fillers, activated carbon fillers and a water outlet area from bottom to top.
As optimization, the water distribution area is 0.5m high; the height of the cobble filler is 0.2 m; the height of the carbon filler is 4 m; the height of the water outlet zone is 1.8 m.
As optimization, the particle size of the activated carbon filler is 2-8mm, the iodine value is 600mg/g, the abrasion strength is more than or equal to 92%, the bulk density is less than or equal to 520kg/m3, and the floating rate is less than or equal to 15%.
As optimization, the activated carbon adsorption device is backwashed every 24 hours.
As optimization, the CODcr index of the raw water inlet in the step S1 is 60-90 mg/L.
As optimization, the active carbon filler is conveyed by adopting a hydraulic or pneumatic conveying mode.
Compared with the prior art, the invention has the following beneficial effects:
1. the activated carbon regenerated by the activated carbon regeneration furnace system is added into the activated carbon adsorption device again, and the adsorption effect is almost the same under the same conditions.
2. The invention realizes the internal circulation of the activated carbon in the sewage plant, does not involve the problems of delivery and disposal of saturated activated carbon (hazardous waste), and saves the cost for purchasing a large amount of new carbon.
3. The conveying of the saturated activated carbon in the invention adopts a hydraulic or pneumatic conveying mode, thus solving the problem that a large amount of manual excavation or replacement is needed after the activated carbon is saturated and regenerated.
4. The process provided by the invention has good effect on advanced treatment of sewage, and the effluent CODcr can reach the standard of V-class water and even IV-class water on the ground surface under the condition that the influent CODcr is less than or equal to 90 mg/L.
5. The regeneration process provided by the invention has the advantages that the quality loss of the activated carbon is small, the iodine value and the methylene blue adsorption value can be completely recovered and even higher than that of the fresh carbon, and the adsorption effect of the regenerated activated carbon is the same as that of the fresh carbon.
Detailed Description
Example 1:
an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant comprises the following steps:
s1: injecting sewage in a sewage plant into an activated carbon adsorption device as raw water, wherein the hydraulic retention time is 1h, the CODcr index of raw water inflow is 120mg/L, and the CODcr index of raw water outflow is 40 mg/L;
s2: when the CODcr index value of the raw water effluent exceeds 40mg/L for three consecutive days, replacing the active carbon filler in the active carbon adsorption device;
s3, putting the activated carbon filler replaced in the step S2 into an activated carbon regeneration furnace for high-temperature impurity desorption for 30 minutes, wherein the temperature of the activated carbon regeneration furnace is 750 ℃, and the activated carbon regeneration furnace is in an oxygen-free state;
and S4, adding the activated carbon filler treated by the S3 into the activated carbon adsorption device in the S1 again, recycling the activated carbon filler and recycling the activated carbon filler.
Furthermore, the activated carbon adsorption device is of an up-flow structure and sequentially comprises a water distribution area, a filter plate, cobblestone filler, activated carbon filler and a water outlet area from bottom to top.
Further, the water distribution area is 0.5m high; the height of the cobble filler is 0.2 m; the height of the carbon filler is 4 m; the height of the water outlet zone is 1.8 m.
Furthermore, the particle size of the active carbon filler is 2-8mm, the iodine value is 600mg/g, the abrasion strength is more than or equal to 92%, the bulk density is less than or equal to 520kg/m3, and the floating rate is less than or equal to 15%.
Further, the activated carbon adsorption device is backwashed every 24 hours.
Furthermore, the conveying of the activated carbon filler adopts a hydraulic or pneumatic conveying mode.
Example 2:
an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant comprises the following steps:
s1: injecting sewage in a sewage plant into an activated carbon adsorption device as raw water, wherein the hydraulic retention time is 1h, the CODcr index of raw water inflow is 90mg/L, and the CODcr index of raw water outflow is 20 mg/L;
s2: when the CODcr index value of the raw water effluent exceeds 40mg/L for three consecutive days, replacing the active carbon filler in the active carbon adsorption device;
s3, putting the activated carbon filler replaced in the step S2 into an activated carbon regeneration furnace for desorbing the impurities at high temperature for 30 minutes, wherein the temperature of the activated carbon regeneration furnace is 850 ℃ and the activated carbon regeneration furnace is in an oxygen-free state;
and S4, adding the activated carbon filler treated by the S3 into the activated carbon adsorption device in the S1 again, recycling the activated carbon filler and recycling the activated carbon filler.
Furthermore, the activated carbon adsorption device is of an up-flow structure and sequentially comprises a water distribution area, a filter plate, cobblestone filler, activated carbon filler and a water outlet area from bottom to top.
Further, the water distribution area is 0.5m high; the height of the cobble filler is 0.2 m; the height of the carbon filler is 4 m; the height of the water outlet zone is 1.8 m.
Furthermore, the particle size of the active carbon filler is 2-8mm, the iodine value is 600mg/g, the abrasion strength is more than or equal to 92%, the bulk density is less than or equal to 520kg/m3, and the floating rate is less than or equal to 15%.
Further, the activated carbon adsorption device is backwashed every 24 hours.
Furthermore, the conveying of the activated carbon filler adopts a hydraulic or pneumatic conveying mode.
Under the condition that the inlet water CODcr is less than or equal to 90mg/L, the outlet water CODcr can reach the standard of class V water and even class IV water on the earth surface.
Example 3:
an in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant comprises the following steps:
s1: injecting sewage in a sewage plant into an activated carbon adsorption device as raw water, wherein the hydraulic retention time is 1h, the CODcr index of raw water inflow is 60mg/L, and the CODcr index of raw water outflow is 20 mg/L;
s2: when the CODcr index value of the raw water effluent exceeds 40mg/L for three consecutive days, replacing the active carbon filler in the active carbon adsorption device;
s3, putting the activated carbon filler replaced in the step S2 into an activated carbon regeneration furnace for desorbing the impurities at high temperature for 30 minutes, wherein the temperature of the activated carbon regeneration furnace is 850 ℃ and the activated carbon regeneration furnace is in an oxygen-free state;
and S4, adding the activated carbon filler treated by the S3 into the activated carbon adsorption device in the S1 again, recycling the activated carbon filler and recycling the activated carbon filler.
Furthermore, the activated carbon adsorption device is of an up-flow structure and sequentially comprises a water distribution area, a filter plate, cobblestone filler, activated carbon filler and a water outlet area from bottom to top.
Further, the water distribution area is 0.5m high; the height of the cobble filler is 0.2 m; the height of the carbon filler is 4 m; the height of the water outlet zone is 1.8 m.
Furthermore, the particle size of the active carbon filler is 2-8mm, the iodine value is 600mg/g, the abrasion strength is more than or equal to 92%, the bulk density is less than or equal to 520kg/m3, and the floating rate is less than or equal to 15%.
Further, the activated carbon adsorption device is backwashed every 24 hours.
Furthermore, the conveying of the activated carbon filler adopts a hydraulic or pneumatic conveying mode.
Under the condition that the inlet water CODcr is less than or equal to 90mg/L, the outlet water CODcr can reach the standard of class V water and even class IV water on the earth surface.
Experimental data:
the process is carried out on-site pilot plant in a sewage plant in Shandong province, wherein the sewage plant is an industrial park sewage plant, the treated water yield is 5000 meters/d, and water sources are mainly surrounding chemical plants and pharmaceutical factories. The pilot scale inflow water is MBR produced water, CODcr is 60-100mg/L, and the effluent water requirement is below 40 mg/L. The pilot test is carried out from 26 days at 4 months to 8 months and 8 days, and the three stages of fresh carbon adsorption test, saturated activated carbon regeneration and activated carbon secondary adsorption after regeneration are successively carried out.
The experimental equipment is listed below:
fresh carbon adsorption test data:
data of secondary adsorption test of regenerated activated carbon:
activated carbon data before and after regeneration:
| sample (I) | Characterization of the sample | Mass loss (%) | Porosity (%) | Iodine value (mg/g), reference GB/T12496.8 | Methylene blue adsorption number (mg/g), reference GB/T12496.10 |
| Fresh charcoal | Untreated sewage | / | 48.5 | 554.06 | 105.0 |
| Saturated carbon | The treated sewage is saturated in adsorption | / | 27.8 | 74.48 | 15.0 |
| 750 saturated carbon | Drying at 200 deg.C, activating at 750 deg.C for 30min | 4.7 | 35.2 | 377.33 | 91.5 |
| 850 g of saturated carbon | Drying at 200 deg.C, activating at 850 deg.C for 30min | 6.3 | 36.2 | 614.10 | 136.5 |
Experimental data shows that the process is installed for treatment, and meanwhile, the activated carbon is activated for 30min at 850 ℃ in an activated carbon regeneration furnace, the quality loss of the regenerated activated carbon is less than or equal to 8%, and the iodine value and the methylene blue adsorption value of the regenerated activated carbon are higher than those of fresh activated carbon. Can completely meet the requirement of the recycling of the active carbon in the sewage plant.
Note: effluent COD detection is divided into high standard and low standard, because the method for detecting COD by national standard potassium dichromate (GB 11914-89) is divided into two types: COD was higher than 50mg/L and lower than 50mg/L, both the concentrations of the reagents used in the two assays and the titred bars were different. As the effluent of the activated carbon is generally less than 50mg/L, the effluent (low standard) data is used as the standard.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. An in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of a sewage plant is characterized by comprising the following steps:
s1: injecting the sewage in the sewage plant into an activated carbon absorption device as raw water with the hydraulic retention time of 1h, wherein the COD of the raw water inlet watercrThe index is 60-120mg/L, and the COD of the raw water effluentcrThe index is 20-40 mg/L;
s2: when raw water is discharged into CODcrAfter the index exceeds 40mg/L for three consecutive days, replacing the active carbon filler in the active carbon adsorption device;
s3, putting the activated carbon filler replaced in the step S2 into an activated carbon regeneration furnace for desorbing the impurities at high temperature for 30 minutes, wherein the temperature of the activated carbon regeneration furnace is 850 ℃ and the activated carbon regeneration furnace is in an oxygen-free state;
and S4, adding the activated carbon filler treated by the S3 into the activated carbon adsorption device in the S1 again, recycling the activated carbon filler and recycling the activated carbon filler.
2. The activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plants according to claim 1, characterized in that: the activated carbon adsorption device is of an up-flow structure and sequentially comprises a water distribution area, a filter plate, cobblestone filler, activated carbon filler and a water outlet area from bottom to top.
3. The in-situ cyclic adsorption regeneration process of activated carbon for advanced treatment of sewage plants according to claim 2, characterized in that: the height of the water distribution area is 0.5 m; the height of the cobble filler is 0.2 m; the height of the carbon filler is 4 m; the height of the water outlet zone is 1.8 m.
4. The activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plants according to claim 1, characterized in that: the particle size of the active carbon filler is 2-8mm, the iodine value is 600mg/g, the abrasion strength is more than or equal to 92%, the bulk density is less than or equal to 520kg/m3, and the floating rate is less than or equal to 15%.
5. The activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plants according to claim 1, characterized in that: the activated carbon adsorption device is backwashed every 24 h.
6. The activated carbon in-situ cyclic adsorption regeneration process for advanced treatment of sewage plants according to claim 1, characterized in that: raw water intake COD in step S1crThe index is 60-90 mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805057A (en) * | 2022-11-29 | 2023-03-17 | 南京誉鼎环境科技有限公司 | Active carbon in-situ adsorption regeneration method applied to high-concentration degradation-resistant wastewater treatment |
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Application publication date: 20200414 |