CN115838217A - Integrated emulsification type oily wastewater pretreatment device and method - Google Patents

Integrated emulsification type oily wastewater pretreatment device and method Download PDF

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CN115838217A
CN115838217A CN202211373894.XA CN202211373894A CN115838217A CN 115838217 A CN115838217 A CN 115838217A CN 202211373894 A CN202211373894 A CN 202211373894A CN 115838217 A CN115838217 A CN 115838217A
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tank
dissolved air
water
coagulant
oil
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张雨婷
童小忠
姚力俊
吴恒刚
祁志福
黄斐鹏
张驰
冯向东
吴贤豪
沈思言
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Zhejiang Energy Group Research Institute Co Ltd
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Abstract

The invention relates to an integrated emulsification type oily wastewater pretreatment device and a method, wherein the integrated emulsification type oily wastewater pretreatment device comprises a reaction tank body, a dosing system, an air flotation system and a waste storage and transportation system; the reaction tank body comprises an oil separation tank, a first regulating tank, a second regulating tank, a dissolved air flotation tank and a water production tank; the pretreatment method comprises the following steps: demulsification, coagulation aid, air flotation slag scraping, reflux and centralized treatment. The beneficial effects of the invention are: the reaction tanks are connected in series, and each reaction tank is sequentially connected with a medicament barrel and a medicament feeding pipe, so that the system has high integration degree, compact structure and good continuity; the dissolved air tank connected with the dissolved air releaser is connected with a reflux pump, so that water in the water producing pool can flow back to the dissolved air tank through a water return port; the emulsion breaking process and the air flotation process are used in series, the emulsion breaking effect is ideal, the effluent is clear and low in turbidity, and the removal rate of the water-insoluble components is high.

Description

Integrated emulsification type oily wastewater pretreatment device and method
Technical Field
The invention relates to the technical field of water treatment, in particular to an integrated emulsification type oily wastewater pretreatment device and method.
Background
With the continuous development of the human industrial level, various grease raw materials and additives are increasingly kept away in production activities, industrial oil with the largest use amount such as crude oil, petroleum, diesel oil, cutting oil and the like at present, and oily wastewater generated in the use process contains various harmful substances such as Polycyclic Aromatic Hydrocarbons (PAHs), heavy metals and asphaltenes.
The emulsified oily wastewater is one of oily wastewater, a large amount of emulsified oily wastewater is generated in industries such as metallurgy, chemical engineering, mechanical processing and the like, the size of oil drops of the emulsified oily wastewater is 0-10 mu m, the emulsified oil exists in a water-in-oil form, the dichromate index (C0 Dcr) is generally 1000-3000 mg/L and can individually reach 10000mg/L, the emulsified oily wastewater is relatively stable and has poor biodegradability, the emulsified oily wastewater has complex components and great harm to the environment, and the emulsified oily wastewater is one of industrial wastewater with relatively high treatment difficulty.
At present, the mature treatment method of the emulsified oily wastewater mainly comprises membrane filtration, coagulating sedimentation, chemical oxidation, physical adsorption separation, biochemistry and the like. The membrane filtration technology has the advantages of simple operation process, high separation efficiency, no need of adding other agents and the like, but due to the characteristic of hydrophobicity of the material, oil drops are easy to adsorb and deposit on the surface of the membrane in the process of treating the emulsified oily wastewater, so that the membrane pores are blocked; both the coagulating sedimentation method and the chemical oxidation method are widely applied and have mature technology, but a large amount of chemical reagents are required to be added, so that additional burden is added for subsequent treatment; the adsorbent used for physical adsorption separation is activated carbon, which has high adsorption efficiency, but the cost of the activated carbon is high, so the method is limited in industrial application; the biochemical method belongs to the treatment process with the lowest cost, but has the problems of lower upper limit of load and poor impact resistance.
In summary, how to design a device and a treatment method that can implement pretreatment of emulsified oily wastewater, thereby reducing the load of a subsequent pollutant removal process, reducing the cost, and improving the treatment efficiency is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an integrated emulsified oil-containing wastewater pretreatment device and method.
The integrated emulsification type oily wastewater pretreatment device comprises a reaction tank body, a dosing system, an air flotation system and a waste storage and transportation system; the reaction tank body comprises an oil separation tank, a first regulating tank, a second regulating tank, a dissolved air flotation tank and a water production tank, and the dosing system comprises a demulsifier barrel, a coagulant barrel and a coagulant aid barrel; the air floatation system comprises a dissolved air tank and a releaser; the waste storage and transportation system comprises an automatic oil extractor, a waste oil storage tank, a slag scraper and a waste residue storage tank;
the oil separation tank, the regulating tank, the dissolved air floatation tank and the water production tank are communicated in sequence; the outer side of the oil separation tank is provided with an incoming water inlet, the oil separation tank is internally provided with a demulsifier dosing pipe and an automatic oil extractor, the demulsifier dosing pipe is connected with a demulsifier barrel, and the automatic oil extractor is connected with a waste oil storage tank; the first regulating tank is provided with a coagulant feeding pipe which is connected with a coagulant barrel; the second adjusting tank is provided with a coagulant aid dosing pipe which is connected with a coagulant aid barrel;
a releaser is arranged in the dissolved air floatation tank and connected with a dissolved air tank; a slag scraper is arranged at the top of the dissolved air floatation tank and connected with a waste residue storage tank; a water return port is arranged at the bottom of the water production tank and is connected with a dissolved air tank; the side surface of the water producing pool is provided with a water producing outlet.
Preferably, the method comprises the following steps: the top of the first regulating reservoir and the top of the second regulating reservoir are respectively provided with a first slow stirrer and a second slow stirrer, and stirring blades of the first slow stirrer and the second slow stirrer extend below the liquid level.
Preferably, the method comprises the following steps: the dissolved air tank is connected with an air compressor; and a dissolved air water pump is arranged between the releaser and the dissolved air tank, and the releaser is arranged at the bottom of the communicated area of the dissolved air floatation tank and the second regulating tank.
Preferably, the method comprises the following steps: the lowest part of a scraper of the slag scraper extends to the position below the liquid level in the dissolved air floatation tank; the end baffle of the slag scraper is provided with a scum storage tank which is connected with the waste residue storage tank through a pipeline and a suction pump.
Preferably, the method comprises the following steps: a first dosing pump is arranged between the demulsifier barrel and the demulsifier dosing pipe, a second dosing pump is arranged between the coagulant barrel and the coagulant dosing pipe, and a third dosing pump is arranged between the coagulant aid barrel and the coagulant aid dosing pipe; a reflux pump is arranged between the water return port and the dissolved air tank,
Preferably, the method comprises the following steps: at the end of the reaction tank, the demulsifier dosing pipe, the coagulant dosing pipe and the coagulant aid dosing pipe all extend to be below the liquid level.
The application method of the integrated emulsification type oily wastewater pretreatment device comprises the following steps:
s1, demulsification: the emulsified oil-containing wastewater firstly enters an oil separation tank from a water inlet, the wastewater is demulsified by a demulsifier barrel and a first dosing pump, and then floating oil components are absorbed to a waste oil storage tank by an automatic oil absorber;
s2, the wastewater automatically flows into a first regulating tank, a coagulant barrel and a second dosing pump are used for dosing a coagulant into the wastewater, and the wastewater is stirred and uniformly mixed by a first slow stirrer;
s3, the wastewater automatically flows into a second regulating tank, the coagulant aid is added into the incoming water through a coagulant aid barrel and a third dosing pump, and the incoming water is stirred and uniformly mixed by a second slow stirrer;
s4, the wastewater automatically flows into a dissolved air floatation tank, compressed air generated by an air compressor and backflow water are mixed in a dissolved air tank to form dissolved air, and the dissolved air is released into the dissolved air floatation tank by a dissolved air releaser to carry out dissolved air floatation oil removal; scum on the surface of the water body in the dissolved air floatation tank is collected through a scum scraper, and the scum is sucked to a waste residue storage tank through a suction pump;
s5, the wastewater automatically flows into a water producing pool, one part of produced water in the water producing pool flows back to the dissolved air tank through a reflux pump, and the other part of the produced water is discharged outside through a water producing port;
and S6, carrying out centralized treatment on the waste oil and the waste residues collected by the system.
Preferably, the method comprises the following steps: the demulsifier in the demulsifier barrel is obtained by preparing a commercially available demulsifier into a 10-30% solution, and the adding concentration of the first dosing pump is 20-1000 ppm; the coagulant in the coagulant tank is obtained by preparing a commercially available coagulant into a 5-10% solution, and the adding concentration of the second dosing pump is 50-400 ppm; the coagulant aid in the coagulant aid barrel is obtained by preparing a commercial coagulant aid into a 1-2% solution, and the adding concentration of the third dosing pump is 1-2 ppm.
Preferably, in step S4: the pressure of the dissolved air tank is 3-5 bar, and the pressure of the water outlet of the dissolved air water pump is 3.5-4.5 bar.
The invention has the beneficial effects that:
1) The integrated emulsification type oily wastewater pretreatment device has the advantages that the reaction tanks are connected in series, and the reaction tanks are sequentially connected with the medicament barrel and the medicament feeding pipe, so that the integration degree is high, the structure is compact, the continuity is good, the construction is convenient, the occupied space is small, and the energy consumption is low.
2) In the integrated emulsified oily wastewater pretreatment device, wastewater in each link enters the next stage in a self-flowing mode, the dissolved air releaser is arranged in the dissolved air floatation tank, and the dissolved air tank connected with the dissolved air releaser is connected with the reflux pump, so that water in the production tank can flow back to the dissolved air tank through the water return port, the energy consumption is effectively reduced, and the cost is saved.
3) According to the invention, by demulsification and collection of fine oil drops, a demulsification process and an air flotation process are creatively connected in series for use, the demulsification effect is ideal, the effluent is clear and low in turbidity, the removal rate of water-insoluble components is high, and the removal rate of suspended solids can reach 92%; the removal rate of petroleum can reach 84 percent, the removal rate of animal and vegetable oil can reach 88 percent, the load of the treated wastewater on the subsequent process is greatly reduced, and the removal rate is stable and sustainable in a long-term running state, thereby achieving the purposes of saving cost and improving treatment efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an integrated emulsification type oily wastewater pretreatment device.
Description of reference numerals: the device comprises an oil separation tank 1, a first adjusting tank 2, a second adjusting tank 3, a dissolved air flotation tank 4, a water production tank 5, an automatic oil extractor 6, a first slow stirrer 7, a second slow stirrer 8, a slag scraper 9, a dissolved air tank 10, an air compressor 11, a dissolved air releaser 12, a first dosing pump 13, a second dosing pump 14, a third dosing pump 15, a reflux pump 16, a suction pump 17, a demulsifier barrel 18, a waste oil storage tank 19, a coagulant barrel 20, a coagulant aid barrel 21 and a waste residue storage barrel 22.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that modifications can be made to the invention by a person skilled in the art without departing from the principle of the invention, and these modifications and modifications also fall within the scope of the claims of the invention.
Example one
As an example, as shown in fig. 1: the integrated emulsification type oily wastewater pretreatment device comprises a reaction tank body, a dosing system, an air flotation system and a waste storage and transportation system. The reaction tank body comprises an oil separation tank 1, a first regulating tank 2, a second regulating tank 3, a dissolved air flotation tank 4 and a water production tank 5, and the dosing system comprises a demulsifier barrel 18, a coagulant barrel 20 and a coagulant aid barrel 21; the air floatation system comprises a dissolved air tank 10 and a releaser 12; the waste storage and transportation system comprises an automatic oil extractor 6, a waste oil storage tank 19, a slag scraper 9 and a waste residue storage tank 22. The wastewater treatment capacity is 70m 3 D, adopting 10-15 mm carbon steel plates as bottom plates, wall plates and inner partition plates of the tank body, adopting 316L-shaped stainless steel as the inner tank body, coating epoxy resin paint on the inner side surface, and setting the total size L multiplied by B multiplied by H of the tank body of the device to be 134 mx 1.8 mx 2m, in particular: the effective length of the oil separation tank 1 is 2.1m, the effective length of the first adjusting tank 2 is 1.4m, the effective length of the second adjusting tank 3 is 1.4m, the effective length of the dissolved air flotation tank is 7.3m, and the effective length of the water production tank is 1.2m.
The outer side of the oil separation tank 1 is provided with an incoming water inlet, the inner side is respectively provided with an automatic oil extractor 6 and a demulsifier dosing pipe, the automatic oil extractor 6 is connected with a waste oil storage tank 19 through a pipeline, the demulsifier dosing pipe is connected with a demulsifier barrel 18 through a first dosing pump 13, and the dosing pipe is ensured to extend to the position below the liquid level.
The top of the first adjusting tank 2 is respectively provided with a slow stirrer 7 and a coagulant feeding pipe, the coagulant feeding pipe is connected with a coagulant barrel 20 through a second dosing pump 14, and the feeding pipe is ensured to extend to the position below the liquid level; used for adding coagulant into the treated water to lead the fine oil particles and suspended matters in the sewage to be coagulated into large oil-containing flocculating constituents. The top of the second adjusting tank 3 is respectively provided with a second slow mixer 8 and a coagulant aid feeding pipe, the coagulant aid feeding pipe is connected with a coagulant aid barrel 21 through a third feeding pump 15, and the feeding pipe ensures that the coagulant aid feeding pipe extends to the position below the liquid level.
The top of the dissolved air flotation tank 4 is provided with a slag scraper 9, the bottommost part of the scraper is ensured to extend to the position below the liquid level, a partition plate at the tail end of the slag scraper is provided with a notch for temporarily storing scum, and the notch is connected with a waste residue storage tank 22 through a pipeline and a suction pump 17. The bottom of the dissolved air floatation tank 4 is provided with a dissolved air releaser 12, the dissolved air releaser 12 is connected with a dissolved air tank 10 through an air channel pipeline, and the dissolved air tank is provided with compressed air by an air compressor 11. The outside of the water producing and dissolving pool 5 is provided with a water producing outlet, the bottom is provided with a water return port, and the water return port is connected with the gas dissolving tank 10 through a water return pipeline and a return pump 16 so as to provide a water source required by gas dissolving.
All equipment in the device is connected with a local PLC control cabinet, and the PLC control cabinet controls the starting and stopping and parameter regulation and control of the whole device.
Example two
As another embodiment, a method of the integrated emulsification type oily wastewater pretreatment device provided in the first embodiment is provided, and the method specifically includes the following steps:
s1, fully demulsifying emulsion type oily wastewater, namely, the emulsion type oily wastewater firstly enters an oil separation tank 1 from a water inlet, and is subjected to demulsification on an oil-water mixture after being added with chemicals through a demulsifier barrel 18 and a first chemical adding pump 13, wherein a demulsifier in the demulsifier barrel 18 is obtained by preparing a commercially available demulsifier into a 10-30% solution, and the adding concentration of the first chemical adding pump 13 is 20-1000 ppm; after the oil is separated into layers, the separated floating oil components are sucked into a waste oil storage tank 19 by an automatic oil suction device 6.
S2, after the demulsification link is finished, collecting fine oil drops; because the oil drops are not easy to fuse, the oil wastewater collected by a coagulation air flotation mode subsequently flows into a first regulating tank 2 automatically, the water is added with a coagulant through a coagulant tank 20 and a second dosing pump 14, the coagulant in the coagulant tank 20 is obtained by preparing a commercially available coagulant into a 5-10% solution, and the adding concentration of the second dosing pump 14 is 50-400 ppm; and is stirred and mixed by a slow stirrer 7.
And S3, the treated wastewater further automatically flows into a second regulating tank 3, the inflow water is added with a coagulant aid through a coagulant aid barrel 21 and a third dosing pump 15, the mixture is uniformly stirred by a slow stirrer 8, the coagulant aid in the coagulant aid barrel 21 is obtained by preparing a commercial coagulant aid into a 1-2% solution, and the adding concentration of the third dosing pump 15 is 1-2 ppm.
S4, the treated wastewater further flows into a dissolved air floatation tank 4 automatically, compressed air generated by an air compressor 11 and return water are mixed in a dissolved air tank 10 to form dissolved air, the dissolved air is released into the tank body by a dissolved air releaser 12 arranged at the bottom of the front end of the floatation tank, the pressure of the dissolved air tank 10 is 3-5 bar, and the pressure of a water outlet of a dissolved air water pump is 3.5-4.5 bar; the dissolved air flotation degreasing is carried out by releasing fine and dispersed air bubbles dissolved in water to adhere to dispersed oil and suspended matters condensed by a coagulant into floating objects; the dense ascending bubbles with small diameters lift the floc formed in the front end regulating tank to float to the surface of the water body of the dissolved air floatation tank 4, and the water entering the air is decompressed to release a large amount of dispersed fine bubbles; the fine bubbles collide and adhere to a flocculating constituent composed of oil and suspended matter; the adhered flocculating constituent floats on the surface of the treated water under the drive of the bubbles, thereby completing the separation of oil, suspended matters and water; the scum scraper 9 scrapes the scum to the groove for temporarily storing the scum, and then the scum is transferred to a waste residue storage tank 22 by a suction pump 17.
And S5, the treated wastewater further flows into a water producing pool 5 automatically, a part of produced water in the water producing pool 5 flows back to the dissolved air tank 10 for air dissolving through the reflux pump 16, and the other part of the produced water is discharged through a water producing port to continuously finish the subsequent treatment process.
And S6, carrying out centralized treatment on the waste oil and the waste residues collected by the system.
EXAMPLE III
As an example, an integrated emulsification type oily wastewater pretreatment apparatus and method combining the first and second examples are proposed, and parameters of wastewater after treatment and stable operation for 15 days and 30 days by the integrated emulsification type oily wastewater pretreatment apparatus described in the first example are compared, as shown in the following table.
Figure BDA0003926083840000051
As can be seen from the table, the average removal rate of the first 15 celestial petroleum after stable operation is 84.2%; the average removal rate of the animal and vegetable oil is 85.4 percent; the haze average removal was 95.2%. The average removal rate of the petroleum is 84.5 percent after the continuous and stable operation for 30 days; the average removal rate of the animal and vegetable oil is 85.7 percent; the turbidity mean removal was 96.2%.
Therefore, the pretreatment device can effectively perform demulsification and oil removal on emulsified oil-containing wastewater such as rolling steel water and the like generated in the production and processing processes of a mechanical manufacturing plant, the equipment is reliable in operation, no abnormality occurs in the long-time operation process, and the effluent quality is stable.
Example four
As another embodiment, an integrated emulsification type oily wastewater pretreatment device is adopted, and the wastewater treatment capacity is 55m 3 D, the inner tank body is made of 316L type stainless steel, the inner side surface of the inner tank body is coated with epoxy resin paint, the total size L multiplied by B multiplied by H of the tank body of the device is 11.5m multiplied by 1.8m, and the concrete steps are as follows: the effective length of the oil separation tank 1 is 1.8m, the effective length of the first adjusting tank 2 is 1.2m, and the second adjusting tankThe effective length of the saving tank 3 is 1.2m, the effective length of the dissolved air flotation tank 4 is 6m, and the effective length of the water producing tank 5 is 1.3m. The equipment is used for treating emulsified oil-containing wastewater generated in the oil product processing process of a certain petrochemical enterprise, the demulsifier is a commercially available brand, the adding amount of the demulsifier is 400ppm, the adding amount of the coagulant is 220ppm, the adding amount of the coagulant aid is 2ppm, and the pressure of a gas dissolving tank is controlled at 4.5bar. According to the method of the integrated emulsification type oily wastewater pretreatment device provided in the embodiment II, the parameters of water inlet and outlet after the device is stably operated for 15 days and 30 days are respectively as follows:
Figure BDA0003926083840000061
as shown in the table above, the average removal rate of the first 15 celestial petroleum after stable operation was 87.3%; the average removal rate of the animal and vegetable oil is 86.2 percent; the haze-average removal rate was 91.7%. The average removal rate of 30-day petroleum in continuous and stable operation is 86.4 percent; the average removal rate of the animal and vegetable oil is 85.9 percent; the haze-average removal rate was 93.5%.
Therefore, the pretreatment device can effectively perform demulsification and oil removal on the emulsified oily wastewater generated in the oil processing process by petrochemical enterprises, the equipment is reliable in operation and has no abnormity, and the effluent quality is stable.

Claims (9)

1. The utility model provides an integration emulsification type oily waste water pretreatment device which characterized in that includes: the system comprises a reaction tank body, a dosing system, an air flotation system and a waste storage and transportation system; the reaction tank body comprises an oil separation tank (1), a first adjusting tank (2), a second adjusting tank (3), a dissolved air flotation tank (4) and a water production tank (5), and the dosing system comprises a demulsifier barrel (18), a coagulant barrel (20) and a coagulant aid barrel (21); the air floatation system comprises a dissolved air tank (10) and a releaser (12); the waste storage and transportation system comprises an automatic oil extractor (6), a waste oil storage tank (19), a slag scraper (9) and a waste residue storage tank (22);
the oil separation tank (1), the adjusting tank (2), the adjusting tank (3), the dissolved air flotation tank (4) and the water production tank (5) are communicated in sequence; an incoming water inlet is arranged on the outer side of the oil separation tank (1), a demulsifier dosing pipe and an automatic oil extractor (6) are arranged in the oil separation tank (1), the demulsifier dosing pipe is connected with a demulsifier barrel (18), and the automatic oil extractor (6) is connected with a waste oil storage tank (19); the first adjusting tank (2) is provided with a coagulant feeding pipe which is connected with a coagulant barrel (20); the second adjusting tank (3) is provided with a coagulant aid dosing pipe which is connected with a coagulant aid barrel (21);
a releaser (12) is arranged in the dissolved air floatation tank (4), and the releaser (12) is connected with a dissolved air tank (10); a slag scraper (9) is arranged at the top of the dissolved air floatation tank (4), and the slag scraper (9) is connected with a waste residue storage tank (22); a water return port is arranged at the bottom of the water producing pool (5), and the water return port is connected with a dissolved air tank (10); a water outlet is arranged on the side surface of the water producing pool (5).
2. The integrated emulsified oil-containing wastewater pretreatment device according to claim 1, wherein: the top parts of the first adjusting tank (2) and the second adjusting tank (3) are also respectively provided with a first slow stirrer (7) and a second slow stirrer (8), and stirring blades of the first slow stirrer (7) and the second slow stirrer (8) all extend below the liquid level.
3. The integrated emulsified oil-containing wastewater pretreatment device according to claim 1, wherein: the dissolved air tank (10) is connected with an air compressor (11); a dissolved air water pump is arranged between the releaser (12) and the dissolved air tank (10); a communicating opening is formed in the bottom of an inner partition plate between the dissolved air flotation tank (4) and the second adjusting tank (3), and a releaser (12) is arranged at the communicating opening of the dissolved air flotation tank (4) and the second adjusting tank (3).
4. The integrated emulsified oil-containing wastewater pretreatment device according to claim 1, wherein: the lowest part of a scraper of the slag scraper (9) extends to the position below the liquid level in the dissolved air floatation tank (4); a scum storage tank is arranged on a baffle at the tail end of the scum scraper (9) and is connected with a waste residue storage tank (22) through a pipeline and a suction pump (17).
5. The integrated emulsified oil-containing wastewater pretreatment device according to claim 1, wherein: a first dosing pump (13) is arranged between the demulsifier barrel (18) and the demulsifier dosing pipe, a second dosing pump (14) is arranged between the coagulant barrel (20) and the coagulant dosing pipe, and a third dosing pump (15) is arranged between the coagulant aid barrel (21) and the coagulant aid dosing pipe; a reflux pump (16) is arranged between the water return port and the dissolved air tank (10).
6. The integrated emulsified oil-containing wastewater pretreatment device according to claim 5, wherein: at the end of the reaction tank, the demulsifier dosing pipe, the coagulant dosing pipe and the coagulant aid dosing pipe all extend to below the liquid level.
7. The use method of the integrated emulsification type oily wastewater pretreatment device according to claim 1, characterized by comprising the following steps:
s1, demulsification: the emulsified oily wastewater firstly enters an oil separation tank (1) from an incoming water inlet, the wastewater is demulsified through a demulsifier barrel (18) and a first dosing pump (13), and then the floating oil component is absorbed to a waste oil storage tank (19) through an automatic oil absorber (6);
s2, the wastewater automatically flows into a first regulating reservoir (2), a coagulant is added into the incoming water through a coagulant barrel (20) and a second coagulant adding pump (14), and the incoming water is stirred and uniformly mixed by a first slow stirrer (7);
s3, the wastewater automatically flows into a second regulating tank (3), the coagulant aid is added into the incoming water through a coagulant aid barrel (21) and a third dosing pump (15), and the incoming water is stirred and uniformly mixed by a second slow stirrer (8);
s4, the wastewater automatically flows into a dissolved air flotation tank (4), compressed air generated by an air compressor (11) and return water are mixed in a dissolved air tank (10) to form dissolved air, and the dissolved air is released into the dissolved air flotation tank (4) by a dissolved air releaser (12) to carry out dissolved air flotation oil removal; scum on the surface of the water body of the dissolved air flotation tank (4) is collected through a scum scraper (9), and the scum is sucked into a waste residue storage tank (22) through a suction pump (17);
s5, the wastewater automatically flows into a water producing pool (5), one part of produced water in the water producing pool (5) flows back to the dissolved air tank (10) through a reflux pump (16), and the other part of the produced water is discharged through a water producing port;
and S6, carrying out centralized treatment on the waste oil and the waste residues collected by the system.
8. The use method of the integrated emulsification type oily wastewater pretreatment device according to claim 7, characterized in that: the demulsifier in the demulsifier barrel (18) is obtained by preparing a commercially available demulsifier into a 10-30% solution, and the adding concentration of the first dosing pump (13) is 20-1000 ppm; the coagulant in the coagulant tank (20) is obtained by preparing a commercially available coagulant into a 5-10% solution, and the adding concentration of the second dosing pump (14) is 50-400 ppm; the coagulant aid in the coagulant aid barrel (21) is obtained by preparing a commercial coagulant aid into a 1-2% solution, and the adding concentration of the third dosing pump (15) is 1-2 ppm.
9. The use method of the integrated emulsification type oily wastewater pretreatment device according to claim 7, wherein in step S4: the pressure of the dissolved air tank (10) is 3-5 bar, and the pressure of the water outlet of the dissolved air water pump is 3.5-4.5 bar.
CN202211373894.XA 2022-11-04 2022-11-04 Integrated emulsification type oily wastewater pretreatment device and method Pending CN115838217A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116395920A (en) * 2023-06-09 2023-07-07 成都硕特科技股份有限公司 Oil removal device and oil removal method for coal chemical wastewater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116395920A (en) * 2023-06-09 2023-07-07 成都硕特科技股份有限公司 Oil removal device and oil removal method for coal chemical wastewater
CN116395920B (en) * 2023-06-09 2023-09-05 成都硕特科技股份有限公司 Oil removal device and oil removal method for coal chemical wastewater

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