CN214571375U - Coking wastewater treatment system for realizing gradient utilization of powdered activated carbon - Google Patents
Coking wastewater treatment system for realizing gradient utilization of powdered activated carbon Download PDFInfo
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Abstract
The utility model relates to a coking wastewater treatment system for realizing gradient utilization of powdered activated carbon, which comprises a pretreatment unit, a pre-aeration unit, a biochemical treatment unit, a material-powder activated carbon treatment unit and a coagulating sedimentation unit; the pre-aeration unit comprises a pre-aeration tank and a primary sedimentation tank; the biochemical treatment unit comprises a first section A/O tank, a second section anoxic tank, a second section aerobic tank and a second sedimentation tank; the activated carbon treatment unit comprises a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a powdered activated carbon adding device; the coagulating sedimentation unit comprises a coagulating sedimentation tank. The utility model discloses can ensure that the coking wastewater after handling reaches 14 water pollutant direct discharge limit indexes that GB16171-2012 "coking chemical industry pollutant emission standard" table 2 required to can save the construction investment, reduce the running cost, improve environmental benefit.
Description
Technical Field
The utility model relates to a coking wastewater treatment technical field especially relates to a coking wastewater treatment system who realizes that powdered activated carbon gradient utilizes.
Background
The effluent indexes of the coking wastewater after biochemical treatment hardly reach the standard stably, and besides a coagulation treatment unit, an advanced treatment system is required to be matched, and the commonly used advanced treatment system mainly comprises an HOK biological fluidized bed, an advanced oxidation system, an activated carbon adsorption system and the like, wherein the advanced oxidation system generally adopts a Fenton (Fenton reagent) catalytic oxidation method and an ozone catalytic oxidation method, and the methods have the following defects:
(1) the biological filler is arranged in the HOK biological fluidized bed, the aeration oxygen supply facility is arranged at the bottom, the biological carrier (composite formula materials such as diatom fine powder and powdered activated carbon) is added into the device, the water quality index of the outlet water of the HOK biological fluidized bed after coagulating sedimentation treatment can meet the requirement of the discharge standard of the industry or environmental protection departments, but the capability of the biological carrier in the device for adsorbing pollutants is limited by the requirement of the outlet water index, the pollutant is required to be discharged when the saturation degree is not reached, waste is caused, the sludge yield is relatively improved, and the operation cost is increased invisibly.
(2) The Fenton (Fenton reagent) catalytic oxidation method can oxidize organic matters, and is particularly suitable for the oxidation treatment of organic wastewater which is difficult to biodegrade or is difficult to effectively oxidize chemically. The technology comprises the steps of firstly adjusting the pH value of wastewater to be below 4 by using concentrated sulfuric acid, then adding a certain amount of ferrous sulfate and hydrogen peroxide to perform Fenton oxidation reaction, adjusting the pH value of the wastewater to be above 7 by using lime milk solution after reacting for a period of time, then adding a polymeric flocculant, and finally performing clarification and separation by using coagulating sedimentation. The treated water quality index can meet the requirements of discharge standards of industries or environmental protection departments, and has the defects of increased operation labor intensity, more sludge yield and relatively high treatment cost, and simultaneously increases the TDS concentration of the effluent, thereby causing very adverse effects on subsequent membrane treatment desalination.
(3) The catalytic ozonation method is a mature coking wastewater treatment process and also an effective wastewater treatment means, ozone can react with most of inorganic matters and organic matters in the coking wastewater, only the reaction rate constant K and the reaction gradient are different, if only ozone is used for removing sewage pollutants, the catalytic ozonation method is theoretically feasible, but a catalyst needs to be matched for exerting greater efficiency. In the actual engineering, the ratio of ozone consumption to COD removal is close to 3 times, which results in extremely large power consumption, therefore, a multi-stage barrier combination technology must be formed by combining other technologies to ensure that the ozone technology is economically applied to the wastewater treatment engineering, and the ozone oxidation method is obviously not a cheap wastewater treatment technology considering the comprehensive factors such as investment, operation cost and the like.
The activated carbon contains a large number of micropores, has huge specific surface area and adsorption capacity, can effectively remove chromaticity and odor, and can remove most organic pollutants and certain inorganic matters in secondary effluent. Factors affecting activated carbon adsorption are: the production process characteristics of the activated carbon; the identity and concentration of the adsorbate; the pH of the wastewater; suspended solids content, etc.; contact system time and operation mode, etc. Activated carbon adsorption is the most important and most effective treatment technology in sewage treatment, and is widely applied at present. When the concentration of the absorbed substance (solute or pollutant) in the solution and the concentration of the absorbed substance on the microporous surface of the activated carbon are in dynamic equilibrium, the adsorption is balanced or saturated, and at the moment, the activated carbon needs to be replaced or a back washing operation procedure needs to be carried out.
Both powdered activated carbon and granular activated carbon are energy efficient in removing color, odor, most organic contaminants and certain inorganic substances. In comparison, the powdered activated carbon has larger contact area, stronger adsorption capacity and more obvious use effect; the granular activated carbon has wider application range, can be recycled through regeneration or backwashing links, and has wider application range; the powdered activated carbon is often discharged as sludge after being used once, and cannot function again. Therefore, it is necessary to excavate the powdered activated carbon application process to maximize its effectiveness.
Disclosure of Invention
The utility model provides a coking wastewater treatment system who realizes powder active carbon gradient utilization can ensure that coking wastewater after handling reaches 14 water pollutant direct emission limit indexes that GB16171-2012 "coking chemical industry pollutant emission standard" table 2 required to can save the construction investment, reduce running cost, improve environmental benefit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coking wastewater treatment system for realizing gradient utilization of powdered activated carbon comprises a pretreatment unit, a pre-aeration unit, a biochemical treatment unit, a material powder activated carbon treatment unit and a coagulating sedimentation unit; the pre-aeration unit comprises a pre-aeration tank and a primary sedimentation tank; the biochemical treatment unit comprises a first section A/O tank, a second section anoxic tank, a second section aerobic tank and a second sedimentation tank; the activated carbon treatment unit comprises a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a powdered activated carbon adding device; the coagulating sedimentation unit comprises a coagulating sedimentation tank; the pretreatment unit is sequentially connected with a preaeration tank, a primary sedimentation tank, a first section A/O tank, a second section anoxic tank, a second section aerobic tank, a secondary sedimentation tank, a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a coagulating sedimentation tank; the powder activated carbon fluidized bed is additionally connected with a powder activated carbon adding device; the coagulating sedimentation tank is additionally connected with a compound coagulant and coagulant aid adding device; the primary sedimentation tank is connected with the pre-aeration tank through a first return sludge pipeline; the secondary sedimentation tank is connected with the water inlet end of the second section of aerobic tank and the water inlet end of the pre-aeration tank through a return sludge pipeline II; the fluidized bed sedimentation tank is connected with the powdered activated carbon fluidized bed and the two-section aerobic tank through an activated carbon pipeline.
A coking wastewater treatment system for realizing gradient utilization of powdered activated carbon also comprises a sludge concentration tank and a sludge treatment unit; and a sludge outlet at the bottom of the primary sedimentation and a sludge outlet at the bottom of the coagulating sedimentation tank are respectively connected with a sludge concentration tank, and the sludge concentration tank is additionally connected with a sludge treatment unit.
The powder activated carbon feeding device consists of a vacuum feeding device, a material preparing and storing system, a slurry preparing system and a slurry conveying system.
The pretreatment unit at least comprises a gravity oil removal device and an air flotation oil removal device.
And a mechanical stirring device or an air stirring device is arranged in the powdered activated carbon fluidized bed.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the active carbon is fully utilized to have good adsorption characteristics of adsorbing organic pollutants and certain inorganic matters, the purpose of efficiently removing the pollutants in the wastewater is achieved, simultaneously, the chromaticity of the wastewater is greatly reduced, the coking wastewater after treatment can stably reach 14 direct water pollutant emission limit indexes required by 'coking chemical industry pollutant emission standard' GB16171-2012 table 2, the emission amount of the pollutants is reduced, and the environmental benefit is improved;
2) according to the treatment capacity of coking wastewater of 100m3The utility model can reduce the construction investment by more than 100 ten thousand yuan compared with the biological fluidized bed process; compared with the granular activated carbon adsorption (excluding a regeneration system) process, the method can reduce the construction investment by more than 150 ten thousand yuan; compared with the ozone catalytic oxidation process, the construction investment can be reduced by more than 200 ten thousand yuan, and the construction investment of the utility model is basically close to that of the Fenton catalytic oxidation process;
3) according to the treatment capacity of coking wastewater of 100m3The utility model can save more than 250 ten thousand yuan of medicament cost every year by the calculation compared with the biological fluidized bed process; compared with the granular activated carbon adsorption (excluding a regeneration system) process, the method can save the medicament cost by more than 130 ten thousand yuan each year; compared with the catalytic oxidation process of ozone, the method can save the medicament cost by more than 62 ten thousand yuan each year; compared with the Fenton catalytic oxidation process, the method can save the medicament cost by more than 45 ten thousand yuan each year;
4) according to the treatment capacity of coking wastewater of 100m3The utility model can reduce the dry sludge treatment amount by over 368 tons every year compared with the biological fluidized bed process; compared with the granular activated carbon adsorption (excluding a regeneration system) process, the utility model can reduce the dry sludge treatment capacity by more than 45 tons every year; compared with the Fenton catalytic oxidation process, the utility model can reduce the dry sludge treatment capacity by more than 740 tons every year;
5) the primary gradient utilization powdered activated carbon is sent to the second-stage aerobic tank, so that the dual effects of biological activated carbon and adsorption are realized, the pollutant removal rate of the second-stage aerobic tank can be improved, the load of a powdered activated carbon fluidized bed is reduced, and the consumption of the powdered activated carbon is reduced;
6) the secondary gradient utilization powdered activated carbon is sent to the pre-aeration tank, so that the pollutant removal rate of the pre-aeration tank can be improved, and the load of a powdered activated carbon fluidized bed is reduced, thereby reducing the consumption of the powdered activated carbon;
7) after the powdered activated carbon is fed for one-time gradient utilization, the volume of the two-section aerobic tank can be reduced, so that the construction investment is saved;
8) after the powdery activated carbon is added and secondarily and gradiently utilized, the volume of the pre-aeration tank can be reduced, and the foam generation amount of the pre-aeration tank can be inhibited, so that the construction investment and the operation cost are saved.
Drawings
FIG. 1 is a schematic diagram of a coking wastewater treatment system for realizing gradient utilization of powdered activated carbon.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in figure 1, the coking wastewater treatment system for realizing gradient utilization of powdered activated carbon comprises a pretreatment unit, a pre-aeration unit, a biochemical treatment unit, a material-powder activated carbon treatment unit and a coagulating sedimentation unit; the pre-aeration unit comprises a pre-aeration tank and a primary sedimentation tank; the biochemical treatment unit comprises a first section A/O tank, a second section anoxic tank, a second section aerobic tank and a second sedimentation tank; the activated carbon treatment unit comprises a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a powdered activated carbon adding device; the coagulating sedimentation unit comprises a coagulating sedimentation tank; the pretreatment unit is sequentially connected with a preaeration tank, a primary sedimentation tank, a first section A/O tank, a second section anoxic tank, a second section aerobic tank, a secondary sedimentation tank, a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a coagulating sedimentation tank; the powder activated carbon fluidized bed is additionally connected with a powder activated carbon adding device; the coagulating sedimentation tank is additionally connected with a compound coagulant and coagulant aid adding device; the primary sedimentation tank is connected with the pre-aeration tank through a first return sludge pipeline; the secondary sedimentation tank is connected with the water inlet end of the second section of aerobic tank and the water inlet end of the pre-aeration tank through a return sludge pipeline II; the fluidized bed sedimentation tank is connected with the powdered activated carbon fluidized bed and the two-section aerobic tank through an activated carbon pipeline.
A coking wastewater treatment system for realizing gradient utilization of powdered activated carbon also comprises a sludge concentration tank and a sludge treatment unit; and a sludge outlet at the bottom of the primary sedimentation and a sludge outlet at the bottom of the coagulating sedimentation tank are respectively connected with a sludge concentration tank, and the sludge concentration tank is additionally connected with a sludge treatment unit.
The powder activated carbon feeding device consists of a vacuum feeding device, a material preparing and storing system, a slurry preparing system and a slurry conveying system.
The pretreatment unit at least comprises a gravity oil removal device and an air flotation oil removal device.
And a mechanical stirring device or an air stirring device is arranged in the powdered activated carbon fluidized bed.
The technical process of the coking wastewater treatment system for realizing gradient utilization of the powdered activated carbon is as follows:
1) the coking wastewater enters a pretreatment unit firstly, and is subjected to gravity oil removal and air floatation oil removal treatment;
2) effluent of the pretreatment unit sequentially enters a pre-aeration tank and a primary sedimentation tank by self-flowing, and in the process, biological flocculation adsorption is realized, and incomplete oxidation reaction is simultaneously carried out; the effluent of the primary sedimentation tank automatically flows into a section of A/O tank;
3) the coking wastewater sequentially flows through a first-stage A/O tank, a second-stage anoxic tank and a second-stage aerobic tank to carry out nitration, denitrification and decarburization reactions, and biodegrades other pollutants, and then enters a secondary sedimentation tank; one part of the powdered activated carbon and sludge separated from the secondary sedimentation tank flows back to the water inlet end of the secondary aerobic tank, the other part of the powdered activated carbon is used as secondary gradient to flow back to the water inlet end of the pre-aeration tank, and the effluent of the secondary sedimentation tank enters a powdered activated carbon fluidized bed by gravity flow;
4) adding a set amount of carbon slurry into a powdered activated carbon fluidized bed through a powdered activated carbon adding device, allowing the carbon slurry mixed solution adsorbed in the powdered activated carbon fluidized bed for a period of time to enter a fluidized bed sedimentation tank, allowing the carbon slurry mixed solution to enter a coagulation sedimentation tank after sedimentation, clarification and separation, and adding a composite coagulant and a coagulant aid into the coagulation sedimentation tank; one part of the carbon slurry sludge at the bottom of the fluidized bed sedimentation tank flows back to the water inlet end of the powdered activated carbon fluidized bed so as to increase the concentration of the powdered activated carbon in the powdered activated carbon fluidized bed, and the other part of the carbon slurry sludge is used as a primary gradient to flow back to the water inlet end of the second-stage aerobic tank by using the powdered activated carbon;
5) and (3) respectively conveying the residual sludge at the bottom of the primary sedimentation tank and the chemical sludge at the bottom of the coagulating sedimentation tank to a sludge concentration tank, and conveying the concentrated sludge to a sludge treatment unit for further treatment.
A coking wastewater treatment process for realizing gradient utilization of powdered activated carbon is characterized in that the raw water quality, the process water quality and the effluent water quality of the coking wastewater meet the following conditions:
1) the raw water quality of the coking wastewater meets the following requirements: the petroleum is less than or equal to 50 mg/L; CODcr is less than or equal to 6000 mg/L; release cyanide is less than or equal to 20 mg/L; volatile phenol is less than or equal to 800 mg/L; ammonia nitrogen is less than or equal to 200 mg/L; total nitrogen is less than or equal to 400 mg/L: the raw water temperature is 25-35 ℃;
2) after gravity oil removal and air flotation oil removal treatment, the coking wastewater entering the pre-aeration unit meets the water quality requirement: the petroleum is less than or equal to 20 mg/L; CODcr is less than or equal to 5000 mg/L; release cyanide is less than or equal to 20 mg/L; volatile phenol is less than or equal to 800 mg/L; ammonia nitrogen is less than or equal to 200 mg/L;
3) after being treated by the pre-aeration tank, the coking wastewater entering the biochemical treatment unit has the following water quality: CODcr is less than or equal to 2300 mg/L; volatile phenol is less than or equal to 280 mg/L; easy-release cyanide is less than or equal to 8 mg/L; the oil content is less than or equal to 5mg/L, and the pH value is 6.5-7.5;
4) the coking wastewater treated by the first-stage A/O tank has the following water quality: CODcr is less than or equal to 300 mg/L; volatile phenol is less than or equal to 0.5 mg/L; easy-release cyanide is less than or equal to 0.5 mg/L; oil is less than or equal to 5 mg/L; ammonia nitrogen is less than or equal to 5 mg/L; the total nitrogen is less than or equal to 50 mg/L; the pH value is 6.5-8.5;
5) the quality of the coking wastewater treated by the second-stage A anoxic tank and the second-stage aerobic tank meets the following requirements: CODcr is less than or equal to 200 mg/L; volatile phenol is less than or equal to 0.3 mg/L; easy-release cyanide is less than or equal to 0.3 mg/L; oil is less than or equal to 2.5 mg/L; ammonia nitrogen is less than or equal to 1 mg/L; the total nitrogen is less than or equal to 20 mg/L; the pH value is 6.5-8.5;
6) the water quality of the effluent of the powdered activated carbon fluidized bed meets the following requirements: CODcr is less than or equal to 100 mg/L; volatile phenol is less than or equal to 0.2 mg/L; easy-release cyanide is less than or equal to 0.2 mg/L;
7) the effluent index of the coagulating sedimentation tank meets the requirement of 14 direct water pollutant emission limit indexes required by the table 2 of GB16171-2012 discharge Standard of pollutants for coking chemistry industry; the specific indexes are as follows: the pH value is 7-8; SS is less than or equal to 50 mg/L; CODcr is less than or equal to 80 mg/L; ammonia nitrogen is less than or equal to 1 mg/L; BOD 5 is less than or equal to 20 mg/L; the total nitrogen is less than or equal to 20 mg/L; the total phosphorus is less than or equal to 1.0 mg/L; the petroleum is less than or equal to 1 mg/L; volatile phenol is less than or equal to 0.1 mg/L; the sulfide is less than or equal to 0.5 mg/L; benzene is less than or equal to 0.1 mg/L; cyanide is less than or equal to 0.2 mg/L; polycyclic aromatic hydrocarbon is less than or equal to 0.05 mg/L; benzo (a) pyrene is less than or equal to 0.03 mu g/L.
The powdered activated carbon is wood or coal-based powdered activated carbon with irregular shape, the particle size specification is 180-125 mu m, the iodine adsorption value is greater than 950mg/g, the methylene blue adsorption value is greater than 180mg/g, the water content is less than or equal to 5%, and the strength is greater than or equal to 90%.
The adding amount of the powdered activated carbon in the powdered activated carbon fluidized bed is not less than 400mg/L, and the sludge concentration is not less than 3000 mg/L; the sludge concentration in the second-stage aerobic tank is not lower than 2000 mg/L; the sludge concentration in the pre-aeration tank is not lower than 4000 mg/L; the COD value of the water body in the powdered activated carbon fluidized bed bearing the initial powdered activated carbon is not more than 200 mg/L; the COD of the water body in the two-stage aerobic tank receiving the primary gradient utilization of the powdered activated carbon is not more than 300 mg/L; the COD value of the water body in the pre-aeration tank receiving the secondary gradient utilization of the powdered activated carbon is not more than 5000 mg/L.
The two-stage anoxic tank adopts a biomembrane method to remove total nitrogen.
The utility model relates to a coking wastewater treatment process's that realization powder active carbon gradient utilized advantage mainly embodies in following several aspects: 1) the powdered activated carbon is utilized in a gradient manner, so that the adding amount of the activated carbon is reduced; 2) the operation of the matched equipment is simple, and the construction investment is low; 3) the sludge yield is reduced, and the operation cost is reduced; 4) can realize stable standard reaching; 5) the automation operation level is improved.
The secondary gradient utilizes the powdered activated carbon to play the same adsorption role in the pre-aeration tank and the two-section aerobic tank. It is easy to understand that the utility model has the same characteristics with the powdered carbon activated sludge Process (PACT).
Except for special instructions, the operation conditions and medicament adding varieties of the pretreatment unit, the biochemical treatment unit and the coagulating sedimentation tank are basically consistent with the operation requirements of the prior art.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this example, the scale of treating coking wastewater is 100m3The coking wastewater treatment system is designed to be composed of a pretreatment unit, a pre-aeration unit, a biochemical treatment unit, a powdered activated carbon treatment unit, a coagulating sedimentation unit and a sludge treatment unit.
The pretreatment unit adopts gravity oil removal and air flotation oil removal technologies, and controls the main index of effluent to be less than or equal to 20mg/L of petroleum.
The pre-aeration unit consists of a pre-aeration tank and a primary sedimentation tank, and the effluent of the primary sedimentation tank meets the following requirements: CODcr is less than or equal to 2300 mg/L; volatile phenol is less than or equal to 280 mg/L; easy-release cyanide is less than or equal to 8 mg/L; oil is less than or equal to 5mg/L, and the pH value is between 6.5 and 7.5.
The biochemical treatment unit adopts a two-stage A/O biological denitrification treatment technology, and the water quality of the effluent of the first section of A/O tank meets the following requirements: CODcr is less than or equal to 300mg/L, volatile phenol is less than or equal to 0.5mg/L, easy-release cyanide is less than or equal to 0.5mg/L, oil is less than or equal to 5mg/L, ammonia nitrogen is less than or equal to 5mg/L, and the total nitrogen is less than or equal to 50mg/L, pH and is between 6.5 and 8.5; the effluent quality of the two-section A/O system meets the following requirements: CODcr is less than or equal to 200mg/L, volatile phenol is less than or equal to 0.3mg/L, easy-release cyanide is less than or equal to 0.3mg/L, oil is less than or equal to 2.5mg/L, ammonia nitrogen is less than or equal to 1mg/L, and the value of total nitrogen is less than or equal to 20mg/L, pH to 6.5-8.5.
In the powdered activated carbon treatment unit, adding carbon slurry into the powdered activated carbon fluidized bed through a full-automatic powdered activated carbon adding device, and adopting mechanical or air stirring, wherein the effluent quality of the powdered activated carbon fluidized bed system meets the following requirements: CODcr is less than or equal to 100mg/L, volatile phenol is less than or equal to 0.2mg/L, easy-release cyanide is less than or equal to 0.2mg/L, and chroma is less than or equal to 30 ℃.
In a coagulating sedimentation unit, adding an efficient composite coagulant and a coagulant aid into a coagulating reaction tank, wherein the pH value of effluent of the coagulating sedimentation tank is 7-8, SS is not more than 50mg/L, CODcr and not more than 80mg/L, ammonia nitrogen is not more than 1mg/L, BOD 5 and not more than 20mg/L, total nitrogen is not more than 20mg/L, total phosphorus is not more than 1.0mg/L, petroleum is not more than 1mg/L, volatile phenol is not more than 0.1mg/L, sulfide is not more than 0.5mg/L, benzene is not more than 0.1mg/L, cyanide is not more than 0.2mg/L, polycyclic aromatic hydrocarbon is not more than 0.05mg/L, and benzo (a) pyrene is not more than 0.03 mu g/L.
After the implementation of the embodiment, compared with the average value of the common coking wastewater treatment process, the construction investment is saved by about 150 ten thousand yuan, which accounts for about 5% of the total investment; the operation cost of saving medicaments per year is about 121.75 ten thousand yuan; the amount of dry sludge produced is about 384 tons per year.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A coking wastewater treatment system for realizing gradient utilization of powdered activated carbon is characterized by comprising a pretreatment unit, a pre-aeration unit, a biochemical treatment unit, a powdered activated carbon treatment unit and a coagulating sedimentation unit; the pre-aeration unit comprises a pre-aeration tank and a primary sedimentation tank; the biochemical treatment unit comprises a first section A/O tank, a second section anoxic tank, a second section aerobic tank and a second sedimentation tank; the activated carbon treatment unit comprises a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a powdered activated carbon adding device; the coagulating sedimentation unit comprises a coagulating sedimentation tank; the pretreatment unit is sequentially connected with a preaeration tank, a primary sedimentation tank, a first section A/O tank, a second section anoxic tank, a second section aerobic tank, a secondary sedimentation tank, a powdered activated carbon fluidized bed, a fluidized bed sedimentation tank and a coagulating sedimentation tank; the powder activated carbon fluidized bed is additionally connected with a powder activated carbon adding device; the coagulating sedimentation tank is additionally connected with a compound coagulant and coagulant aid adding device; the primary sedimentation tank is connected with the pre-aeration tank through a first return sludge pipeline; the secondary sedimentation tank is connected with the water inlet end of the second section of aerobic tank and the water inlet end of the pre-aeration tank through a return sludge pipeline II; the fluidized bed sedimentation tank is connected with the powdered activated carbon fluidized bed and the two-section aerobic tank through an activated carbon pipeline.
2. The coking wastewater treatment system for realizing gradient utilization of powdered activated carbon as claimed in claim 1, further comprising a sludge concentration tank and a sludge treatment unit; and a sludge outlet at the bottom of the primary sedimentation tank and a sludge outlet at the bottom of the coagulating sedimentation tank are respectively connected with a sludge concentration tank, and the sludge concentration tank is additionally connected with a sludge treatment unit.
3. The coking wastewater treatment system for realizing gradient utilization of powdered activated carbon as claimed in claim 1, wherein the powdered activated carbon adding device is composed of a vacuum feeding device, a stock preparing and storing system, a slurry preparing system and a slurry conveying system.
4. The system for treating coking wastewater by realizing gradient utilization of powdered activated carbon as claimed in claim 1, wherein the pretreatment unit at least comprises a gravity oil removal device and an air flotation oil removal device.
5. The coking wastewater treatment system for realizing gradient utilization of powdered activated carbon as claimed in claim 1, wherein a mechanical stirring device or an air stirring device is arranged in the powdered activated carbon fluidized bed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624525A (en) * | 2020-12-30 | 2021-04-09 | 中冶焦耐(大连)工程技术有限公司 | Coking wastewater treatment system and process for realizing gradient utilization of powdered activated carbon |
| CN114506970A (en) * | 2022-01-24 | 2022-05-17 | 天津市政工程设计研究总院有限公司 | System and method for cooperatively treating sewage and sludge by using powdered activated carbon |
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2020
- 2020-12-30 CN CN202023293454.2U patent/CN214571375U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624525A (en) * | 2020-12-30 | 2021-04-09 | 中冶焦耐(大连)工程技术有限公司 | Coking wastewater treatment system and process for realizing gradient utilization of powdered activated carbon |
| CN114506970A (en) * | 2022-01-24 | 2022-05-17 | 天津市政工程设计研究总院有限公司 | System and method for cooperatively treating sewage and sludge by using powdered activated carbon |
| CN114506970B (en) * | 2022-01-24 | 2023-09-19 | 天津市政工程设计研究总院有限公司 | System and method for cooperatively treating sewage and sludge by using powdered activated carbon |
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