CN113511740A - Secondary demulsification treatment method for cold rolling oily wastewater - Google Patents
Secondary demulsification treatment method for cold rolling oily wastewater Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a secondary demulsification treatment method for cold rolling oily wastewater, which is characterized by comprising the following steps of: the method comprises the following steps: collecting cold rolling oily wastewater and separating oil from water to obtain primary oil removal wastewater; adding an emulsion separating agent, stirring, adding liquid caustic soda to adjust the pH value, and adding polyaluminium chloride and polyacrylamide to obtain secondary oil-removing wastewater; adding a polyacrylamide aqueous solution and a polyaluminum chloride aqueous solution, and introducing compressed air to stir uniformly to obtain a demulsifying supernatant; sending the demulsifying supernatant into an anaerobic tank for anaerobic treatment, then flowing into an aerobic tank for aerobic treatment, and finally flowing into an aerobic sedimentation tank to obtain supernatant without ammonia nitrogen; the supernatant fluid without ammonia nitrogen flows into an aeration biological filter for purification to obtain clear water which is discharged up to the standard; then flows into a clean water tank, and finally flows into a discharge water tank for discharge. The invention improves the purification effect of demulsification by a secondary demulsification process; meets the discharge requirements of ammonia nitrogen and total nitrogen through an A/O treatment system.
Description
Technical Field
The invention relates to an improvement of a cold rolling wastewater treatment method, in particular to a secondary demulsification treatment method of cold rolling oily wastewater.
Background
In the production process of the cold-rolled steel strip, a large amount of high-concentration organic wastewater is generated, and the organic wastewater contains high-concentration organic pollutants, ammonia nitrogen, salt and other various pollutants, so that the water quality is complex; if the treatment can not meet the standard requirement and the treatment is directly discharged, the treatment will have serious influence on the surrounding environment.
Because cold rolling oily waste water belongs to difficult-to-treat water and has poor biochemical performance, a physicochemical treatment method is adopted in China, namely a process route of demulsification, biochemistry, precipitation, filtration and heating is adopted, and the problems in the following aspects are mainly solved: (1) the demulsification system can not provide stable water quality for the subsequent biochemical treatment unit, thereby influencing the efficient operation of the biochemical treatment unit; (2) the biochemical treatment unit does not have the function of removing ammonia nitrogen and total nitrogen, can not meet the requirements on ammonia nitrogen and total nitrogen emission limit values in the existing emission standard, causes the problems of high operation cost, large sludge amount, unstable effluent quality after treatment or difficult standard emission and the like, and has the problem of secondary pollution.
Disclosure of Invention
The invention aims to provide a secondary demulsification treatment method for cold rolling oily wastewater, which is simple and convenient to apply, low in treatment cost and stable in operation and enables the cold rolling oily wastewater to reach the discharge standard.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the secondary demulsification treatment method of the cold rolling oily wastewater is characterized by comprising the following steps: the method comprises the following steps: collecting cold rolling oily wastewater and separating oil from water: sending cold-rolled oily wastewater generated in the production process of cold-rolled steel strips into an oily regulating reservoir, introducing steam into the oily regulating reservoir, heating to 20-30 ℃, and then sending the oily wastewater into an oil separation tank through a lifting pump for oil-water separation; the floating oil floating on the liquid level flows back to the oil-containing regulating pool through an oil discharge pipe at the upper part of the oil separation tank; a primary demulsification lift pump is arranged at the bottom of the oil separation tank, and primary deoiling wastewater with part of floating oil removed in the oil separation tank is discharged into a primary demulsification pool through the primary demulsification lift pump; (II) two-stage intensified demulsification: the volume of the primary demulsifying pool is 15 cubic meters, after the primary deoiling wastewater is filled in the primary demulsifying pool, 150 kilograms of 98% emulsion separating agent is added into the primary demulsifying pool and is stirred by a mechanical stirrer, so that the emulsion separating agent and the primary deoiling wastewater are quickly and uniformly mixed, and the emulsion separating agent and oily pollutants in the primary deoiling wastewater are fully reacted; adding 32% liquid alkali to adjust the pH value to 7-9; then 0.5 kg of polyaluminium chloride is added to form flocculation groups; adding 1.5 kg of polyacrylamide to accelerate flocculation, precipitating a flocculation group to the bottom of the primary demulsification tank to form sludge, obtaining secondary oil-removing wastewater at the upper part, and discharging the sludge at the bottom into a sludge concentration tank through a sludge pump;
the secondary deoiling waste water in the primary demulsifying pool flows into a secondary demulsifying pool through a demulsifying communicating pipe, a polyacrylamide aqueous solution with the concentration of 0.2 percent and a polyaluminium chloride aqueous solution with the concentration of 1.25 percent are simultaneously added into the demulsifying communicating pipe by using a metering pump, compressed air is introduced into the demulsifying communicating pipe and is uniformly stirred, the residual oily pollutants in the secondary deoiling waste water are further removed, the water quality is further improved, the upper part of the secondary deoiling waste water is obtained into a demulsifying supernatant, and sludge formed at the bottom is discharged into a sludge concentration tank through a sludge pump; discharging the demulsification supernatant into a water collecting tank through a secondary demulsification lift pump for storage;
(III) anaerobic and aerobic treatment is carried out by adopting an A/O treatment system: the A/O treatment system consists of an anaerobic tank, an aerobic tank and an aerobic sedimentation tank; sending the demulsification supernatant in the water collecting tank into an anaerobic tank through a submersible sewage pump for anaerobic treatment, and removing organic matters in the demulsification supernatant by using anaerobic bacteria; then flowing into an aerobic tank for aerobic treatment, and carrying out aerobic respiration on the activated sludge to further decompose organic matters into inorganic matters; finally, the sludge flows into an aerobic sedimentation tank, is kept stand for 1 to 2 hours, and the sludge settled at the bottom is discharged into a sludge concentration tank through a sludge pump; supernatant liquid with ammonia nitrogen removed is obtained at the upper part;
(IV) treating the aerated biological filter: enabling the supernatant fluid without ammonia nitrogen to flow into the biological aerated filter for rapid purification to obtain clear water discharged up to the standard;
(V) collecting a clean water pool: clear water which is filtered from the biological aerated filter and is discharged after reaching the standard flows into a clear water tank, and then flows into a discharge water tank for discharging;
(VI) sludge treatment: sludge collected in the sludge concentration tank is dehydrated into solid by a plate-and-frame filter press to be treated in a centralized way.
In the step (one), the oil separation tank is an oil separation tank produced by Shandong Chisheng New energy equipment Co., Ltd, and has the following model: GSL-70003, specification: q =120m3/d。
In the step (II), 2 mechanical mixers are arranged in the primary breast breaking pool, the power of each mechanical mixer is 0.75kW, and the rotating speed is 120 r/min; the flow rate of the metering pump is controlled at 20 liters/hour.
In the step (III), 2 submersible sewage pumps are arranged, and the flow rate is 6-8 m3The lift is 6m, and the power is 1.5 kW.
In the step (III), a submersible stirrer is arranged at the bottom of the anaerobic tank to prevent sludge in the anaerobic tank from depositing; submersible mixer be equipped with 2, the paddle diameter is 600mm, the paddle material is 304 stainless steel, the power is 1.5 kW.
In the third step, the diameter of the aeration hose in the aerobic tank is DN150, and the aeration area is 40m2(ii) a The aerobic sedimentation tank is a vertical sedimentation tank.
In the step (IV), the biological aerated filter is an upflow filter, and the model thereof is as follows: the GSL-70002 of the plant,specification: q =120m3The particle size of the biological filter material is 3-5 mm, and the apparent density is 1.4-1.6 g/cm3The bulk density is less than or equal to 0.9g/cm3The specific surface area is more than or equal to 2 x 104cm2Per g, a throughput of 5 to 7m3H, the gas washing strength is 10-15L/m2S, the water washing strength of air-water backwashing is 5-8L/m2·s。
The invention has the beneficial effects that: compared with the existing treatment method of cold rolling oily wastewater, the invention increases the pretreatment effect of the cold rolling oily wastewater by additionally arranging the oil separation tank behind the oily regulating tank; a secondary demulsification process is added, so that the demulsification purification effect is improved; the A/O treatment system with organic matter purification and denitrification functions is additionally arranged, has the functions of removing ammonia nitrogen and total nitrogen, meets the requirements of the emission limits of ammonia nitrogen and total nitrogen in the existing emission standard, and ensures that the discharged water quality meets the requirements of 'emission standard of steel industry pollutants in Shandong province'.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The present invention is explained with reference to fig. 1.
The secondary demulsification treatment method of the cold rolling oily wastewater is characterized by comprising the following steps: the method comprises the following steps:
collecting cold rolling oily wastewater and separating oil from water: sending cold-rolled oily wastewater generated in the production process of cold-rolled steel strips into an oily regulating reservoir, introducing steam into the oily regulating reservoir, heating to 20-30 ℃, and then sending the oily wastewater into an oil separation tank through a lifting pump for oil-water separation; the floating oil floating on the liquid level flows back to the oil-containing regulating pool through an oil discharge pipe at the upper part of the oil separation tank; the bottom of the oil separation tank is provided with a primary demulsification lift pump, and primary deoiling wastewater with partial floating oil removed in the oil separation tank is discharged into a primary demulsification pool through the primary demulsification lift pump.
In the step (one), the oil separation tank is an oil separation tank produced by Shandong Chisheng New energy equipment Co., Ltd, and has the following model: GSL-70003, specification: q =120m3/d。
(II) two-stage intensified demulsification: the volume of the primary demulsifying pool is 15 cubic meters, after the primary deoiling wastewater is filled in the primary demulsifying pool, 150 kilograms of 98% emulsion separating agent is added into the primary demulsifying pool and is stirred by a mechanical stirrer, so that the emulsion separating agent and the primary deoiling wastewater are quickly and uniformly mixed, and the emulsion separating agent and oily pollutants in the primary deoiling wastewater are fully reacted; adding 32% liquid alkali to adjust the pH value to 7-9; 0.5 kg of polyaluminium chloride (PAC) was added to form a flocculated mass; and adding 1.5 kg of Polyacrylamide (PAM) to accelerate flocculation, precipitating a flocculation group to the bottom of the primary demulsification tank to form sludge, obtaining secondary oil-removing wastewater from the upper part of the primary demulsification tank, and discharging the sludge at the bottom into a sludge concentration tank through a sludge pump.
The secondary oil-removing wastewater in the primary demulsification pool flows into a secondary demulsification pool through a demulsification communicating pipe, a Polyacrylamide (PAM) aqueous solution with the concentration of 0.2% and a polyaluminium chloride (PAC) aqueous solution with the concentration of 1.25% are simultaneously added into the demulsification communicating pipe through a metering pump, compressed air is introduced into the demulsification communicating pipe and uniformly stirred, and oil-containing pollutants remained in the secondary oil-removing wastewater are further removed, so that the water quality is further improved, a demulsification supernatant is obtained at the upper part of the secondary oil-removing wastewater, and sludge formed at the bottom of the secondary oil-removing wastewater is discharged into a sludge concentration pool through a sludge pump; and discharging the demulsification supernatant into a water collecting tank for storage through a secondary demulsification lift pump.
In the step (II), 2 mechanical mixers are arranged in the primary breast breaking pool, the power of each mechanical mixer is 0.75kW, and the rotating speed is 120 r/min; the flow rate of the metering pump is controlled at 20 liters/hour.
(III) anaerobic and aerobic treatment is carried out by adopting an A/O treatment system: the A/O treatment system consists of an anaerobic (A) pool, an aerobic (O) pool and an aerobic sedimentation pool; the demulsification supernatant in the water collecting tank is sent into an anaerobic tank (A) for anaerobic treatment by a submersible sewage pump, and organic matters in the demulsification supernatant are removed by anaerobic bacteria; then flowing into an aerobic (O) pool for aerobic treatment, and leading the activated sludge to carry out aerobic respiration to further decompose organic matters into inorganic matters; finally, the sludge flows into an aerobic sedimentation tank, is kept stand for 1 to 2 hours, and the sludge settled at the bottom is discharged into a sludge concentration tank through a sludge pump; the upper part of the solution is the supernatant liquid from which the ammonia nitrogen is removed.
In the step (III), 2 submersible sewage pumps are arranged, and the flow rate is 6-8 m3The lift is 6m, and the power is 1.5 kW.
In the step (III), a submersible stirrer is arranged at the bottom of the anaerobic pool (A) to prevent sludge in the anaerobic pool (A) from depositing; submersible mixer be equipped with 2, the paddle diameter is 600mm, the paddle material is 304 stainless steel, the power is 1.5 kW.
In the third step, the diameter of the aeration hose in the aerobic (O) pool is DN150, and the aeration area is 40m2(ii) a The aerobic sedimentation tank is a vertical sedimentation tank. (IV) treating the aerated biological filter: and enabling the supernatant fluid without ammonia nitrogen to flow into the biological aerated filter for rapid purification to obtain clear water discharged up to the standard.
In the step (IV), the biological aerated filter is an upflow filter, and the model thereof is as follows: GSL-70002, specification: q =120m3The particle size of the biological filter material is 3-5 mm, and the apparent density is 1.4-1.6 g/cm3The bulk density is less than or equal to 0.9g/cm3The specific surface area is more than or equal to 2 x 104cm2Per g, a throughput of 5 to 7m3H, the gas washing strength is 10-15L/m2S, the water washing strength of air-water backwashing is 5-8L/m2·s。
(V) collecting a clean water pool: and the clear water which is filtered from the biological aerated filter and discharged after reaching the standard flows into a clear water tank, and then flows into a discharge water tank for discharging.
(VI) sludge treatment: sludge collected in the sludge concentration tank is dehydrated into solid by a plate-and-frame filter press to be treated in a centralized way.
Claims (6)
1. A secondary demulsification treatment method of cold rolling oily wastewater is characterized by comprising the following steps: the method comprises the following steps: collecting cold rolling oily wastewater and separating oil from water: sending cold-rolled oily wastewater generated in the production process of cold-rolled steel strips into an oily regulating reservoir, introducing steam into the oily regulating reservoir, heating to 20-30 ℃, and then sending the oily wastewater into an oil separation tank through a lifting pump for oil-water separation; the floating oil floating on the liquid level flows back to the oil-containing regulating pool through an oil discharge pipe at the upper part of the oil separation tank; a primary demulsification lift pump is arranged at the bottom of the oil separation tank, and primary deoiling wastewater with part of floating oil removed in the oil separation tank is discharged into a primary demulsification pool through the primary demulsification lift pump; (II) two-stage intensified demulsification: the volume of the primary demulsifying pool is 15 cubic meters, after the primary deoiling wastewater is filled in the primary demulsifying pool, 150 kilograms of 98% emulsion separating agent is added into the primary demulsifying pool and is stirred by a mechanical stirrer, so that the emulsion separating agent and the primary deoiling wastewater are quickly and uniformly mixed, and the emulsion separating agent and oily pollutants in the primary deoiling wastewater are fully reacted; adding 32% liquid alkali to adjust the pH value to 7-9; then 0.5 kg of polyaluminium chloride is added to form flocculation groups; adding 1.5 kg of polyacrylamide to accelerate flocculation, precipitating a flocculation group to the bottom of the primary demulsification tank to form sludge, obtaining secondary oil-removing wastewater at the upper part, and discharging the sludge at the bottom into a sludge concentration tank through a sludge pump;
the secondary deoiling waste water in the primary demulsifying pool flows into a secondary demulsifying pool through a demulsifying communicating pipe, a polyacrylamide aqueous solution with the concentration of 0.2 percent and a polyaluminium chloride aqueous solution with the concentration of 1.25 percent are simultaneously added into the demulsifying communicating pipe by using a metering pump, compressed air is introduced into the demulsifying communicating pipe and is uniformly stirred, the residual oily pollutants in the secondary deoiling waste water are further removed, the water quality is further improved, the upper part of the secondary deoiling waste water is obtained into a demulsifying supernatant, and sludge formed at the bottom is discharged into a sludge concentration tank through a sludge pump; discharging the demulsification supernatant into a water collecting tank through a secondary demulsification lift pump for storage;
(III) anaerobic and aerobic treatment is carried out by adopting an A/O treatment system: the A/O treatment system consists of an anaerobic tank, an aerobic tank and an aerobic sedimentation tank; sending the demulsification supernatant in the water collecting tank into an anaerobic tank through a submersible sewage pump for anaerobic treatment, and removing organic matters in the demulsification supernatant by using anaerobic bacteria; then flowing into an aerobic tank for aerobic treatment, and carrying out aerobic respiration on the activated sludge to further decompose organic matters into inorganic matters; finally, the sludge flows into an aerobic sedimentation tank, is kept stand for 1 to 2 hours, and the sludge settled at the bottom is discharged into a sludge concentration tank through a sludge pump; supernatant liquid with ammonia nitrogen removed is obtained at the upper part;
(IV) treating the aerated biological filter: enabling the supernatant fluid without ammonia nitrogen to flow into the biological aerated filter for rapid purification to obtain clear water discharged up to the standard;
(V) collecting a clean water pool: clear water which is filtered from the biological aerated filter and is discharged after reaching the standard flows into a clear water tank, and then flows into a discharge water tank for discharging;
(VI) sludge treatment: sludge collected in the sludge concentration tank is dehydrated into solid by a plate-and-frame filter press to be treated in a centralized way.
2. The secondary demulsification treatment method for cold rolling oily wastewater as claimed in claim 1, which is characterized in that: in the step (II), 2 mechanical mixers are arranged in the primary breast breaking pool, the power of each mechanical mixer is 0.75kW, and the rotating speed is 120 r/min; the flow rate of the metering pump is controlled at 20 liters/hour.
3. The secondary demulsification treatment method for cold rolling oily wastewater as claimed in claim 1, which is characterized in that: in the step (III), 2 submersible sewage pumps are arranged, and the flow rate is 6-8 m3The lift is 6m, and the power is 1.5 kW.
4. The secondary demulsification treatment method for cold rolling oily wastewater as claimed in claim 1, which is characterized in that: in the step (III), a submersible stirrer is arranged at the bottom of the anaerobic tank to prevent sludge in the anaerobic tank from depositing; submersible mixer be equipped with 2, the paddle diameter is 600mm, the paddle material is 304 stainless steel, the power is 1.5 kW.
5. The secondary demulsification treatment method for cold rolling oily wastewater as claimed in claim 1, which is characterized in that: in the third step, the diameter of the aeration hose in the aerobic tank is DN150, and the aeration area is 40m2(ii) a The aerobic sedimentation tank is a vertical sedimentation tank.
6. According to claimThe secondary demulsification treatment method of the cold rolling oily wastewater, which is characterized by comprising the following steps: in the step (IV), the biological aerated filter is an upflow filter, and the model thereof is as follows: GSL-70002, specification: q =120m3The particle size of the biological filter material is 3-5 mm, and the apparent density is 1.4-1.6 g/cm3The bulk density is less than or equal to 0.9g/cm3The specific surface area is more than or equal to 2 x 104cm2Per g, a throughput of 5 to 7m3H, the gas washing strength is 10-15L/m2S, the water washing strength of air-water backwashing is 5-8L/m2·s。
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Application publication date: 20211019 |