CN109279710B - Pretreatment system and method for semi-coke wastewater - Google Patents

Pretreatment system and method for semi-coke wastewater Download PDF

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Publication number
CN109279710B
CN109279710B CN201811138031.8A CN201811138031A CN109279710B CN 109279710 B CN109279710 B CN 109279710B CN 201811138031 A CN201811138031 A CN 201811138031A CN 109279710 B CN109279710 B CN 109279710B
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wastewater
semi
pretreatment
oil
separation
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CN109279710A (en
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孔庆伟
鲁礼民
陈芳
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Xi'an Hengxu Technology Co ltd
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Xi'an Hengxu Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281Installations for water purification using chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The invention relates to a semi-coke wastewater treatment system and a semi-coke wastewater treatment method, wherein the treatment system comprises a buffer pretreatment device, a multiphase flow efficient separation device, a flocculation mixing device and a double-medium filtering device which are sequentially connected, and the buffer pretreatment device, the multiphase flow efficient separation device, the flocculation mixing device and the double-medium filtering device are also respectively connected to an oil product collecting tank. The semi-coke wastewater pretreatment system is a closed system, and a targeted treatment process is adopted for each stage of wastewater, so that the wastewater treatment efficiency is greatly improved compared with that of the conventional standing treatment method, and each stage of wastewater is treated to the next stage, the treatment stages are not interfered with each other, and the problem of harmful gas leakage can be effectively solved; the occupied area is small, and the treatment efficiency is high.

Description

Pretreatment system and method for semi-coke wastewater
Technical Field
The invention belongs to the technical field of coal chemical wastewater treatment, and particularly relates to a semi-coke wastewater pretreatment system and method.
Background
The semi-coke wastewater is also called semi-coke wastewater, and is industrial wastewater formed in the low-metamorphic coal low-medium temperature dry distillation (about 600-800 ℃) process and the coal gas purification and semi-coke steam quenching processes, the wastewater has the characteristic of being high in four and low in one (high COD, high oil, high ammonia nitrogen, high phenol and low in wastewater generation amount), and contains a large amount of substances which are difficult to degrade, high in toxicity and complex in components, such as ammonia, phenol, petroleum and the like.
At present, no mature semi-coke wastewater pretreatment process exists at home and abroad, and semi-coke enterprises directly settle semi-coke wastewater in a settling pond, simply remove coal tar and solid suspended matters in water and directly use the coal tar and the solid suspended matters as coke quenching water. The sedimentation method of the sedimentation tank has low efficiency, and the indexes of the coal tar content and the suspended solid content in the treated water are unstable under the influence of the internal structure.
The sedimentation tank is an open water tank, so that the occupied area is large, and the total volume is large, so that the dosage of the medicament is large, the reaction effect of the medicament is poor and the wastewater treatment efficiency is low when the wastewater treatment medicament is added into the wastewater tank; on the other hand, the semi-coke wastewater contains a large amount of harmful substances, and is easy to volatilize in an open wastewater pool or enter air along with steam, so that the environment is polluted. Therefore, effective pretreatment of high-concentration organic wastewater discharged in the semi-coke production process is imminent, and the high efficiency and reliability of a pretreatment system directly influence the normal operation of a subsequent production process.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a semi-coke wastewater pretreatment system and a semi-coke wastewater pretreatment method. The technical problem to be solved by the invention is realized by the following technical scheme:
the embodiment of the invention provides a semi-coke wastewater pretreatment system, which comprises a buffering pretreatment device, a multiphase flow high-efficiency separation device, a flocculation mixing device and a double-medium filtering device which are sequentially connected, wherein the buffering pretreatment device, the multiphase flow high-efficiency separation device, the flocculation mixing device and the double-medium filtering device are also respectively connected to an oil product collecting tank,
the input end of the buffering pretreatment device is connected with a semi-coke wastewater output pipe and is used for inputting the semi-coke wastewater and performing heavy oil separation treatment to obtain heavy oil and secondary wastewater;
the multiphase flow high-efficiency separation device is used for separating the light oil from the secondary wastewater to obtain tertiary wastewater;
the mixed flocculation device is used for performing flocculation and sedimentation on suspended matters in the tertiary wastewater to obtain quaternary wastewater;
and the output end of the double-medium filtering device is connected with a drainage pipeline and is used for filtering the four-stage wastewater and discharging the four-stage wastewater from the drainage pipeline.
In a specific embodiment, a static mixer is arranged on a pipeline between the semi-coke wastewater output pipe and the input end of the buffering pretreatment device, and the first chemical adding device is connected to the static mixer through a pipeline.
In a specific embodiment, the multiphase flow high-efficiency separation device comprises a hypergravity cyclone pre-separation cylinder and a multiphase separation chamber, wherein a liquid inlet of the hypergravity cyclone pre-separation cylinder is connected with the buffer pretreatment device, and a liquid outlet of the hypergravity cyclone pre-separation cylinder is connected with the multiphase separation chamber;
the multiphase separation chamber is internally provided with a flow pattern adjusting device, a first-stage oil removing inclined plate, a partition plate, a coalescing device, a second-stage oil removing inclined plate, a mud baffle plate and an overflow weir plate in sequence along the length direction.
In a specific embodiment, the inner cavity of the mixing flocculation device is provided with a stirring device, and the mixing flocculation device is connected with a second dosing device through a pipeline.
In a specific embodiment, a first booster pump is arranged between the buffer pretreatment device and the multiphase flow high-efficiency separation device, a second booster pump is arranged between the multiphase flow high-efficiency separation device and the flocculation device, and a third booster pump is arranged between the flocculation device and the double-medium filtering device.
In a specific embodiment, the system further comprises a full-automatic control system, and the full-automatic control system is respectively connected with the buffer pretreatment device, the multiphase flow high-efficiency separation device, the flocculation device and the dual-media filtration device, and is used for performing signal control on the buffer pretreatment device, the multiphase flow high-efficiency separation device, the flocculation device and the dual-media filtration device.
Another embodiment of the present invention provides a semi-coke wastewater pretreatment method, including the steps of:
step 1: carrying out heavy oil separation treatment on the semi-coke wastewater to obtain secondary wastewater;
step 2: separating the light oil from the secondary wastewater to obtain tertiary wastewater;
and step 3: performing flocculation sedimentation on suspended matters in the tertiary wastewater to obtain quaternary wastewater;
and 4, step 4: and filtering the four-stage wastewater and then discharging.
In a specific embodiment, the step 1 includes:
adding a demulsifier into the semi-coke wastewater;
and standing the semi-coke wastewater added with the demulsifier for N hours to separate heavy oil from water, wherein N is more than 1.
In a specific embodiment, the step 2 specifically includes:
carrying out supergravity separation and flow pattern adjustment on the secondary wastewater to obtain light mixed wastewater;
and (3) carrying out coalescence separation on the light mixed wastewater to layer heavy oil, light oil, water and sludge to obtain three-level wastewater.
In a specific embodiment, the step 3 includes:
adding a flocculating agent into the tertiary wastewater;
and stirring the tertiary wastewater added with the flocculating agent.
Compared with the prior art, the invention has the beneficial effects that:
1. the semi-coke wastewater pretreatment system is a closed system, the semi-coke wastewater is in a flowing state in the treatment process by arranging the buffer pretreatment device, the multiphase flow high-efficiency separation device, the mixed flocculation device and the double-medium filtering device, and four parts of the system work simultaneously, so that the semi-coke wastewater treatment efficiency is higher, and the problem of harmful gas leakage can be effectively solved; on the other hand, the demulsifier is added in the buffer pretreatment stage, and the flocculant is added in the tertiary wastewater treatment stage, so that the added medicament is more targeted, and the medicament use efficiency is higher, therefore, the medicament use amount can be reduced, and the cost is reduced.
2. In the embodiment of the invention, the buffer pretreatment device, the multiphase flow efficient separation device, the flocculation device and the double-medium filtering device are respectively connected to the oil product collecting tank, so that the semi-coke wastewater can be effectively treated, and simultaneously, the coal tar and the oil sludge contained in the semi-coke wastewater are recovered, thereby greatly reducing the operating cost of the environment-friendly device and having particularly remarkable later-stage industrial application effect.
3. The multiphase flow efficient separation device in the embodiment of the invention adopts multiphase flow separation and coalescence technology, so that light oil floats on water, heavy oil and oil sludge are deposited underwater, and the efficient separation of the oil on the water and the oil under the water is realized; the device is internally provided with components such as a rotational flow pre-separation component, a flow pattern adjustment component, a coalescence filler component, an inclined plate and the like to fully and efficiently separate the oil-in-water and oil-in-water particle size molecules in the secondary wastewater, and then the coalescence is carried out with high efficiency by a coalescence device, so that the oil drops and water drops are changed into a continuous phase from a dispersed phase, and the oil-containing index requirement in water is ensured.
4. According to the semi-coke wastewater pretreatment system and method provided by the invention, a targeted treatment process is adopted for each stage of wastewater, so that the wastewater treatment efficiency is greatly improved compared with that of the conventional standing treatment method, and each stage of wastewater is treated to the next stage without interference among treatment levels, so that a large amount of semi-coke wastewater can be treated. The method can solve the problem of pretreatment of a large amount of semi-coke wastewater by using smaller fields and resources.
Drawings
Fig. 1 is a schematic structural diagram of a semi-coke wastewater pretreatment system provided by the invention;
FIG. 2 is a flow chart of a semi-coke wastewater pretreatment method provided by the present invention;
FIG. 3 is a schematic structural diagram of a multiphase flow high-efficiency separation device provided by the present invention;
FIG. 4 is a schematic structural diagram of a supergravity cyclone pre-separation cartridge of the multiphase flow high-efficiency separation device provided by the invention;
FIG. 5 is a schematic structural diagram of a flow pattern distribution adjusting device of the efficient multiphase flow separation device provided by the present invention;
FIG. 6 is a schematic structural diagram of an energy absorber of the multiphase flow high-efficiency separation device provided by the invention;
FIG. 7 is a schematic structural diagram of a first-stage oil removal sloping plate of the multiphase flow high-efficiency separation device provided by the invention;
FIG. 8 is a schematic structural diagram of a two-stage oil removal sloping plate of the multiphase flow high-efficiency separation device provided by the invention;
FIG. 9 is a schematic structural diagram of a primary coalescing device of the multiphase flow high efficiency separation device provided by the invention;
FIG. 10 is a schematic structural diagram of a two-stage coalescence device of the semi-coke wastewater multi-phase flow high-efficiency separation device according to the present invention;
fig. 11 is a schematic structural diagram of an overflow weir plate of the multiphase flow high-efficiency separation device provided by the invention;
fig. 12 is a schematic structural diagram of a partition plate of the multiphase flow high-efficiency separation device provided by the invention.
Description of reference numerals:
1. a liquid inlet; 2. a super-gravity rotational flow pre-separation cylinder; 3. a liquid dropping pipe; 4. a flow pattern distribution adjusting device; 5. an energy absorber; 6. a first sludge discharge port; 7. a first-stage oil removal sloping plate; 8. a partition plate; 9. a primary coalescing means; 10. a secondary coalescing means; 11. a secondary oil removal sloping plate; 12. a safety valve; 13. an exhaust port; 14. an oil-water interface instrument; 15. a sampling port; 16. a water chamber liquid level meter; 17. an overflow weir plate; 18. an oil chamber liquid level meter; 19. an oil outlet; 20. a support; 21. a water outlet; 22. a mud baffle plate; 23. a second sewage draining outlet; 24. a third sludge discharge port; 25. a housing; 2-1, a top plate; 2-2, a spiral plate; 2-3, separating cylinder shell; 2-4, supporting a tube; 4-1, a liquid baffle; 4-2, fixing the pore plate; 5-1, an energy absorption plate; 5-2, supporting frames; 7-1, a first fixing plate; 7-2 of a prismatic plate; 9-1, a first packing frame; 9-2, a first filler; 10-1, a second packing frame; 10-2, a second filler; 11-1 and a second fixing plate; 11-2 and a rack.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
In order to solve the problems of the existing semi-coke wastewater pretreatment process, the invention provides a semi-coke high-concentration organic wastewater resource pretreatment system which is a high-efficiency separation system, reliable and stable in operation and free of pollutant generation.
Specifically, as shown in fig. 1, fig. 1 is a schematic structural diagram of a semi-coke wastewater pretreatment system provided in this embodiment; the embodiment provides a blue charcoal pretreatment of water system that gives up, including the buffering preprocessing device that connects gradually, heterogeneous stream high efficiency separation device, mix flocculation device and two medium filter equipment, wherein, buffering preprocessing device's input links to each other with blue charcoal waste water output tube, blue charcoal waste water gets into buffering preprocessing device at first, the device has the effect of buffering blue charcoal waste water, slow down the velocity of flow of blue charcoal waste water, under the effect of gravity, heavy oil and fatlute deposit, light oil and water float, realize the preseparation of heavy coal tar and waste water, and buffering preprocessing device and oil collecting tank are connected, heavy oil and fatlute subside to buffering preprocessing device bottom, and enter the oil collecting tank, and the second grade waste water of isolating then gets into heterogeneous stream high efficiency separation device through the pipeline.
It should be noted that a static mixer is arranged on a pipeline between the semi-coke wastewater output pipe and the input end of the buffering pretreatment device, and the first chemical adding device is connected to the static mixer through a pipeline. Specifically, a first dosing device is used for adding a demulsifier into the semi-coke wastewater, and the demulsifier and the semi-coke wastewater are mixed in a static mixer. Because the action of the demulsifier needs a certain reaction time, in the invention, the demulsifier is added before the semi-coke wastewater enters the pretreatment system, and then the semi-coke wastewater passes through the buffering pretreatment process of the first procedure, when the semi-coke wastewater reaches the multiphase flow high-efficiency separation device of the second procedure, the demulsifier can better generate better drug effect on oil-water emulsion, and the demulsification separation effect can be better obtained by matching with the multiphase flow high-efficiency separation device. Can realize better drug effect with less drug amount, save the use of the drug amount and solve the problem of poor drug effect in the prior art.
An external delivery pump is further arranged between the semi-coke wastewater output pipe and the input end of the buffering pretreatment device, a first booster pump is arranged between the buffering pretreatment device and the multiphase flow high-efficiency separation device, and the pump is used, so that the flow rate of the semi-coke wastewater is controllable, and the treatment capacity of the semi-coke wastewater is also controllable in unit time.
As shown in fig. 3, the multi-phase flow high-efficiency separation device comprises a supergravity cyclone pre-separation cylinder and a multi-phase separation chamber, wherein a liquid inlet of the supergravity cyclone pre-separation cylinder is connected with the buffering pretreatment device, and a liquid outlet of the supergravity cyclone pre-separation cylinder is connected with the multi-phase separation chamber;
the multiphase separation chamber is internally provided with a flow pattern adjusting device, a first-stage oil removing inclined plate, a partition plate, a coalescing device, a second-stage oil removing inclined plate, a mud baffle plate and an overflow weir plate in sequence along the length direction.
Specifically, the secondary wastewater enters the supergravity cyclone pre-separation cylinder through the liquid inlet, is subjected to continuous phase oil-water separation and buffer storage through a cyclone flow channel arranged inside, and then enters the multiphase separation chamber.
It should be noted that a first end of the supergravity rotational flow pre-separation cylinder is connected with the liquid inlet 1, a second end of the supergravity rotational flow pre-separation cylinder 2 is fixedly connected with a shell 25 of the multiphase flow high-efficiency separation device, a liquid dropping pipe 3, a flow pattern distribution adjusting device 4 and an energy absorber 5 are arranged below the second end of the supergravity rotational flow pre-separation cylinder 2, and the liquid dropping pipe 3 plays a role in guiding liquid flowing direction; as shown in fig. 5, the flow pattern distribution adjusting device 4 is composed of a liquid baffle 4-1 and a fixed orifice plate 4-2, and is used for adjusting the state of the mixed liquid and transiting from a turbulent layer to a laminar layer; as shown in fig. 6, the energy absorber 5 is composed of an energy absorbing plate 5-1 and a supporting frame 5-2, specifically, a first end of the liquid dropping pipe is fixedly connected with the inner wall of the shell and is communicated with the super-gravity rotational flow pre-separating cylinder; the second end of the liquid dropping pipe is fixedly connected with the flow pattern distribution adjusting device; the flow pattern distribution adjusting device is fixed on the inner wall of the shell; the energy absorber is fixedly connected with the inner wall of the shell and is arranged below the flow pattern distribution adjusting device.
As shown in fig. 4, the supergravity cyclone preseparator cartridge 2 includes: a top plate 2-1, a spiral plate 2-2, a separating cylinder shell 2-3 and a supporting tube 2-4; the top plate is arranged at the top end of a cavity formed by the separating cylinder shell and is fixedly connected with the separating cylinder shell; the spiral plate is arranged in a cavity formed by the separating cylinder shell and is spirally and fixedly connected around the supporting tube; one end of the supporting tube is fixedly connected with the top plate. Because the spiral plate is fixed on the supporting tube, a gap is reserved between the spiral plate and the shell of the separation cylinder, and the supporting tube is also fixed with the top plate, the spiral device of the hypergravity rotational flow pre-separation cylinder 2 can be drawn out from the separation cylinder, and is very convenient to maintain and replace. According to the supergravity rotational flow pre-separation barrel 2, the separation barrel is fixedly connected with the shell 25 through bolts, the inner spiral plates form a fluid flow channel, various centrifugal forces of oil and water can be effectively enhanced through designing the shape and the size of the flow channel, so that the oil and water in a mixed liquid are in full collision contact with each other, the oil and water separation efficiency is improved, the screw pitch of the inner flow channel is 50-500 mm, the heavy oil, the oil sludge and the light mixed wastewater can be optimally layered through the screw pitch of the size, and the centrifugal forces generated by different screw pitch sizes are changed, so that different effects are caused. The material of the super-gravity rotational flow pre-separation cylinder 2 can be metal or nonmetal according to the characteristics of a medium.
The specific working principle is as follows: the secondary wastewater is subjected to the centrifugal action of the super-gravity cyclone pre-separation cylinder 2 to enable heavy oil, oil sludge and light mixed wastewater to be layered, then the layered wastewater enters a liquid dropping pipe 3 below the super-gravity cyclone pre-separation cylinder 2, the liquid dropping pipe 3 guides the heavy oil, the oil sludge and the light mixed wastewater to enter a flow pattern distribution adjusting device 4, the heavy oil, the oil sludge and the light mixed wastewater impact an energy absorbing plate 5-1 of an energy absorber 5 under the action of gravity, the emulsion breaking effect is further enhanced, the primary separation of oil and water among phases is completed, the heavy oil and the oil sludge are settled under the impact action of the energy absorbing plate 5-1, the primarily separated light mixed wastewater flows to the upper layer of the flow pattern distribution adjusting device 4 through a plurality of through holes on the flow pattern distribution adjusting device 4, the sludge and solid are blocked at the lower layer, and the primary separation of silt and solid suspended matters is completed, heavy oil and oil sludge are discharged outside through the first discharge port 6, and light mixed wastewater enters the multiphase separation chamber.
The combination of the hypergravity separation cylinder 2, the manifold adjusting device 4 and the energy absorber 5 has an active water washing demulsification effect on semi-coke wastewater, improves the hydraulic condition of multiphase separation, and accelerates the separation speed of oil, water, sludge and solid suspended matters.
Further, the light mixed wastewater enters the multiphase separation chamber and then is subjected to oil-water phase re-separation through the primary oil removal inclined plate, as shown in fig. 7, the primary oil removal inclined plate 7 is composed of a first fixing plate 7-1 and a ridge plate 7-2, is arranged on the right side of the liquid dropping pipe 3 and the flow pattern distribution adjusting device 4 and is fixedly connected with the inner wall of the shell 25 of the multiphase flow high-efficiency separation device, after the light mixed wastewater passes through the plate, the oil-water phases are different in gravity according to density, and the oil-water phase separation efficiency can be enhanced when the light mixed wastewater passes through the ridge plate. The height of the first-stage oil removal inclined plate 7 is 0.1-2 m, and the inclination angle is 50-75 degrees. Part of the oil sludge and the solid suspended matters are retained by the partition plate 8, the partition plate 8 is arranged between the first-stage oil removal inclined plate 7 and the first-stage coalescence device 9 and is vertically fixed on the inner wall of the second shell 25, and the structure is shown in figure 12 and used for reducing the oil sludge and the fixed suspended matters entering the first-stage coalescence device 9. It should be noted that the position that baffle 8 kept off and is kept is provided with the drain, and the drain is connected with the oil collection tank, and fatlute and suspended solid are arranged outward through the drain.
Further, the light mixed wastewater enters a first-stage coalescence device 9 after passing through a first-stage oil removal inclined plate 7, as shown in fig. 9, the first-stage coalescence device 9 comprises a first filler frame 9-1 and a first filler 9-2, and is used for demulsifying and coalescing primary emulsion with oil and water in an interphase manner, oil and water droplets with the particle size of less than 80 microns can be subjected to interphase demulsification and coalescence in the first-stage coalescence device 9, and according to the difference of surface tension of oil and water molecules, the in-phase coalescence is performed to complete the preliminary coalescence and separation of oil and water, and then the light mixed wastewater enters a second-stage coalescence device 10, as shown in fig. 10, the second-stage coalescence device 10 comprises a second filler frame 10-1 and a second filler 10-2, and is used for demulsifying and coalescing residual emulsion with the oil and water in an interphase after the first-stage coalescence, and oil with the particle size of more than 80 microns and less than 100 microns can be further accelerated in the second-stage coalescence device 10, Coalescence of water molecule droplets.
Further, the light mixed wastewater enters a secondary oil removal sloping plate through a secondary coalescence device, as shown in fig. 8, the secondary oil removal sloping plate 11 consists of a second fixing plate 11-1 and a rack 11-2, is arranged on the right side of the secondary coalescence device and is fixedly connected with the inner wall of the shell 25, oil-water phases passing through the primary oil removal sloping plate, the primary coalescence device and the secondary coalescence device can break the surface tension of the oil-water emulsion after passing through the rack 11-2, and then the oil-water phase separation efficiency is further improved according to different gravity generated by the density of each phase of the oil-water. And then the light mixed wastewater subjected to oil-water separation enters a separation flow field, in the embodiment, the smooth separation is a horizontal flow region in the multiphase separation chamber, specifically, a horizontal flow section is arranged in the separation flow field to provide stable flow field conditions for oil water droplets, and heavy oil/oil sludge sinks, light oil floats upwards and water is in the middle under the stable horizontal flow environment according to the density difference.
It should be noted that a third sewage draining outlet 24 is further provided at the bottom of the horizontal flow area for draining the accumulated oil stains.
Specifically, be provided with mud baffle 22 and overflow weir plate 17 in the heterogeneous separation chamber, light mixed waste water gets into the waste water storage area through mud baffle 22, the waste water storage area sets up overflow weir plate 17, overflow weir plate 17's structure is as shown in fig. 11, mud baffle 22 blocks the fatlute in the advection district, tertiary waste water passes through, overflow weir plate 17 blocks tertiary waste water, the oil slick on waste water upper strata passes through overflow weir plate 17 and gets into the oil reservoir, the fatlute blocks the district and is provided with second drain 23, discharge fatlute, the waste water storage area also is provided with outlet 21, be connected with the flocculation device through the pipeline, the oil reservoir is provided with oil drain 19.
It should be noted that the packing thickness of the first stage coalescence device 9 of the present invention is: 0.3-4 m, oil removal rate of 90-95% and porosity of 70-85%; the filler thickness of the secondary coalescence device 10 is 0.3-4 m, the oil removal rate is 95-99%, and the porosity is 85-90%.
In the embodiment, the multi-phase flow efficient separation device adopts an efficient cyclone separation technology and a special coalescence technology, so that the separation speed is increased, the settling time is reduced, the multi-phase flow efficient separation device sufficiently and efficiently separates the particle size molecules of oil-in-water and oil-in-water in the secondary wastewater, and efficient coalescence is carried out by depending on a core component, so that oil drops and water drops are changed into a continuous phase from a dispersed phase, the efficient coalescence separation of oil and water is realized, the oil-containing index requirement in water is ensured, and the qualified continuous stable water quality is provided for the post-stage process of the new technology.
It should be noted that the top of the casing 25 of the multiphase flow high-efficiency separation device of the present invention is further provided with a safety valve 12, an exhaust port 13, an oil-water interface meter 14, a sampling port 15, a water chamber level meter 16 and an oil chamber level meter 18; wherein the water chamber liquid level meter 16 is arranged on the shell 25 in front of the overflow weir plate 17, and the oil chamber liquid level meter 18 is arranged on the shell 25 behind the overflow weir plate 17.
The semi-coke wastewater multi-phase flow high-efficiency separation device also comprises two bases 20, and the shell 25 fixes the whole device on the ground or other fixed objects through the bases 20.
Further, the inner cavity of the mixing flocculation device is provided with a stirring device, and the mixing flocculation device is connected with a second dosing device through a pipeline.
Install the second booster pump between the high-efficient separator of heterogeneous stream and the muddy flocculation device, install agitating unit in the muddy flocculation device, when tertiary waste water flows at a high speed under the effect of second booster pump, the second charge device adds the flocculating agent to the tertiary waste water that gets into at a high speed, make tertiary waste water and medicament intensive mixing, rethread agitating unit stirring effect, the pharmacodynamic reaction accelerates, make the flocculation effect better, reaction rate is faster, improve the flocculation and sedimentation speed, get rid of the solid suspended solid in the waste water fast. And the treated four-stage wastewater enters a double-medium filtering device.
Furthermore, a third booster pump is arranged between the mixed flocculation device and the double-medium filtering device. The third booster pump can control the speed of entering the double-medium filtering device, and the physical filtering quality is ensured. The four-stage wastewater still contains a small amount of oil and floccules, the double-medium filtering device is the last physical filtering process of the pretreatment system, a gravel supporting layer, a coarse sand layer, a fine sand layer and a smokeless coal layer are arranged in the double-medium filtering device, and the coal tar and the solid suspended matters in the wastewater are treated to qualified indexes (the oil content in the water is less than or equal to that of the oil)
500mg/L, suspended matter content is less than or equal to 20mg/L), and the treated wastewater enters a subsequent treatment system.
The process flows of buffering pretreatment, efficient multi-phase flow separation, mixed flocculation treatment and double-medium filtration are adopted in the embodiment, so that coal tar and solid suspended matters in the wastewater are effectively treated, the oil content is less than or equal to 500mg/L and the suspended matter content is less than or equal to 20mg/L after treatment, a new pretreatment process technology is provided for resource comprehensive treatment of semi-coke wastewater, and a foundation is laid for green cycle development of the semi-coke industry.
Further, it should be noted that the pretreatment system provided in this embodiment further includes a full-automatic control system, and the full-automatic control system is respectively connected to the buffer pretreatment device, the multiphase flow efficient separation device, the flocculation device and the dual-media filtration device, and is configured to perform signal control on the buffer pretreatment device, the multiphase flow efficient separation device, the flocculation device and the dual-media filtration device.
The start, pause, operation and other internal control of the buffer pretreatment device, the multiphase flow high-efficiency separation device, the flocculation device and the double-medium filtering device are controlled by a full-automatic control system. The operator only needs to operate the full-automatic control system, and can complete the control of each link in the pretreatment system.
Example two
On the basis of the above embodiment, in the embodiment of the present invention, the buffering pretreatment device, the multiphase flow high-efficiency separation device, the flocculation device and the dual-media filtration device, which are sequentially connected in the first embodiment, are used to perform a pretreatment method on the semi-coke wastewater, and a specific implementation process is shown in fig. 2, where fig. 2 is a flowchart of the semi-coke wastewater pretreatment method provided in this embodiment. The semi-coke wastewater pretreatment method comprises the following steps:
step 1: carrying out heavy oil separation treatment on the semi-coke wastewater to obtain secondary wastewater; specifically, a static mixer is used for adding a demulsifier into the semi-coke wastewater; and standing the semi-coke wastewater added with the demulsifier in a buffer pretreatment device for N hours to separate heavy oil from water, wherein the heavy oil enters an oil product collecting tank, and secondary wastewater is discharged through a pipeline, wherein the standing time of the wastewater is set according to the comprehensive conditions such as the actual wastewater amount, the reaction speed of the demulsifier, the temperature condition and the like.
The specific standing time of the semi-coke wastewater needs to be set in combination with the water amount and the temperature condition, and is not particularly limited herein.
Step 2: separating the light oil from the secondary wastewater to obtain tertiary wastewater; specifically, a hypergravity rotational flow pre-separation cylinder of a multiphase flow high-efficiency separation device is used for carrying out hypergravity separation on the secondary wastewater to obtain light mixed wastewater; and (3) carrying out oil removal, coalescence and separation on the light mixed wastewater in a multiphase separation chamber, layering heavy oil/oil sludge, tertiary wastewater and light oil, and discharging through different outlets.
And step 3: performing flocculation sedimentation on suspended matters in the tertiary wastewater to obtain quaternary wastewater; specifically, a flocculating agent is added into a mixed flocculation device; and stirring the tertiary wastewater added with the flocculating agent to accelerate the sedimentation of suspended matters, and enabling the qualified wastewater to enter a double-medium filtering device.
And 4, step 4: and filtering the four-stage wastewater and then discharging. Specifically, two medium filter equipment carry out the physics to the level four waste water that gets into and filter, further get rid of oil and suspended solid impurity in the level four waste water.
The technical scheme adopted by the invention mainly shows that the process flow of buffer pretreatment, efficient multi-phase flow separation, mixed flocculation treatment and double-medium filtration is adopted. The targeted treatment process is adopted for each level of wastewater, so that the wastewater treatment efficiency is greatly improved compared with the existing standing treatment method, and each level of wastewater is treated and then reaches the next level, and the treatment levels are not interfered with each other, so that a large amount of semi-coke wastewater can be treated. The method can solve the problem of pretreatment of a large amount of semi-coke wastewater by using smaller fields and resources.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A semi-coke wastewater pretreatment system is characterized by comprising a buffering pretreatment device, a multiphase flow high-efficiency separation device, a mixed flocculation device and a double-medium filtering device which are sequentially connected, wherein the buffering pretreatment device, the multiphase flow high-efficiency separation device, the mixed flocculation device and the double-medium filtering device are also respectively connected to an oil product collecting tank,
the input end of the buffering pretreatment device is connected with a semi-coke wastewater output pipe and is used for inputting the semi-coke wastewater and performing heavy oil separation treatment to obtain heavy oil and secondary wastewater;
the multiphase flow high-efficiency separation device is used for separating the light oil from the secondary wastewater to obtain tertiary wastewater;
the mixed flocculation device is used for performing flocculation and sedimentation on suspended matters in the tertiary wastewater to obtain quaternary wastewater;
the output end of the double-medium filtering device is connected with a drainage pipeline and is used for filtering the four-stage wastewater and discharging the four-stage wastewater from the drainage pipeline;
the high-efficiency multiphase flow separation device comprises a hypergravity cyclone preseparation cylinder and a multiphase separation chamber, wherein a liquid inlet of the hypergravity cyclone preseparation cylinder is connected with the buffering pretreatment device, and a liquid outlet of the hypergravity cyclone preseparation cylinder is connected with the multiphase separation chamber;
a flow pattern adjusting device, a primary oil removing inclined plate, a partition plate, a coalescing device, a secondary oil removing inclined plate, a mud baffle plate and an overflow weir plate are sequentially arranged in the multiphase separation chamber along the length direction;
the hypergravity whirl preseparation section of thick bamboo includes: the device comprises a top plate, a spiral plate, a separating cylinder shell and a supporting tube; the top plate is arranged at the top end of a cavity formed by the separating cylinder shells and is fixedly connected with the separating cylinder shells; the spiral plate is arranged in a cavity formed by the separating cylinder shell and is spirally and fixedly connected around the supporting tube; one end of the supporting tube is fixedly connected with the top plate;
a liquid dropping pipe, a flow pattern distribution adjusting device and an energy absorber are arranged below the super-gravity rotational flow pre-separating cylinder, the liquid dropping pipe plays a role in guiding the flow direction of liquid, the flow pattern distribution adjusting device consists of a liquid baffle plate and a fixed pore plate, the energy absorber consists of an energy absorbing plate and a supporting frame, and particularly, the first end of the liquid dropping pipe is fixedly connected with the inner wall of the shell and is communicated with the super-gravity rotational flow pre-separating cylinder; the second end of the liquid dropping pipe is fixedly connected with the flow pattern distribution adjusting device; the flow pattern distribution adjusting device is fixed on the inner wall of the shell; the energy absorber is fixedly connected with the inner wall of the shell and is arranged below the flow pattern distribution adjusting device.
2. The pretreatment system of claim 1, wherein a static mixer is arranged on a pipeline between the semi-coke wastewater output pipe and the input end of the buffer pretreatment device, and the first chemical adding device is connected to the static mixer through a pipeline.
3. The pretreatment system of claim 1, wherein an inner cavity of the mixing flocculation device is provided with a stirring device, and the mixing flocculation device is connected with a second dosing device through a pipeline.
4. The pretreatment system of claim 1, wherein a first booster pump is installed between the buffer pretreatment device and the multiphase flow high efficiency separation device, a second booster pump is installed between the multiphase flow high efficiency separation device and the flocculation device, and a third booster pump is installed between the flocculation device and the dual media filtration device.
5. The pretreatment system of claim 1, further comprising a fully automatic control system, wherein the fully automatic control system is respectively connected to the buffer pretreatment device, the multiphase flow high efficiency separation device, the flocculation device and the dual-media filtration device, and is used for performing signal control on the buffer pretreatment device, the multiphase flow high efficiency separation device, the flocculation device and the dual-media filtration device.
6. A semi coke wastewater pretreatment method, characterized by being performed using the semi coke wastewater pretreatment system according to any one of claims 1 to 5, the method comprising the steps of:
step 1: carrying out heavy oil separation treatment on the semi-coke wastewater to obtain secondary wastewater;
step 2: separating the light oil from the secondary wastewater to obtain tertiary wastewater;
and step 3: performing flocculation sedimentation on suspended matters in the tertiary wastewater to obtain quaternary wastewater;
and 4, step 4: and filtering the four-stage wastewater and then discharging.
7. The semi coke wastewater pretreatment method according to claim 6, wherein the step 1 comprises:
adding a demulsifier into the semi-coke wastewater;
and standing the semi-coke wastewater added with the demulsifier for N hours to separate heavy oil from water.
8. The semi-coke wastewater pretreatment method according to claim 6, wherein the step 2 is specifically:
carrying out supergravity separation and flow pattern adjustment on the secondary wastewater to obtain light mixed wastewater;
and (3) carrying out coalescence separation on the light mixed wastewater to layer heavy oil, light oil, water and sludge to obtain three-level wastewater.
9. The semi coke wastewater pretreatment method according to claim 6, wherein said step 3 comprises:
adding a flocculating agent into the tertiary wastewater;
and stirring the tertiary wastewater added with the flocculating agent.
CN201811138031.8A 2018-09-28 2018-09-28 Pretreatment system and method for semi-coke wastewater Active CN109279710B (en)

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