CN106430862B

CN106430862B - Oil extraction wastewater treatment device integrating settling tank, biology and dissolved air floatation

Info

Publication number: CN106430862B
Application number: CN201611145573.9A
Authority: CN
Inventors: 刘萍; 柳国政; 王金山; 王明琨; 万亭君
Original assignee: Daqing Haiyouqing Petroleum Science & Technology Co ltd
Current assignee: Daqing Haiyouqing Petroleum Science & Technology Co ltd
Priority date: 2016-12-13
Filing date: 2016-12-13
Publication date: 2023-04-07
Anticipated expiration: 2036-12-13
Also published as: CN106430862A

Abstract

An oil extraction wastewater treatment device integrating a settling tank, biology and dissolved air floatation. The device is mainly divided into an air floatation area and a biological purification sedimentation area. The oil receiving system is composed of an upper oil receiving tank and a heating coil in the tank body, the middle of the lower part of the oil system is an air floatation area composed of a sleeve type air floatation cylinder body, and a water distribution pipe, an air floatation releaser and an upper middle partition cylinder are arranged in the air floatation area. The outside of the air floatation area is provided with an annular biological filler frame, and microorganisms are attached to a filler body. The biological purification settling zone is provided with a heating coil, a water collecting pipe and a water collecting chamber of the middle partition barrel from the bottom to the bottom of the tank respectively, the aeration system consists of an aeration pipeline and an aeration head, and is also provided with a bottom sludge discharge pipe. The waste water is subjected to air floatation separation and microorganisms to perform demulsification and degradation on the oil extraction waste water, so that the oil-water sedimentation separation effect is improved. This tank-type oily sewage biochemical treatment device, make full use of current process equipment, with low costs, it is few to take up an area of, has mainly solved the poor problem of oil water sedimentation separation effect that exists among the prior art.

Description

Oil extraction wastewater treatment device integrating settling tank, biology and dissolved air floatation

The technical field is as follows:

the invention relates to the technical field of oil extraction wastewater treatment, in particular to an oil extraction wastewater treatment device integrating a settling tank, biology and dissolved air floatation.

Background art:

the oilfield development modes are from water flooding to polymer flooding and ternary combination flooding, and the components of the produced water are complex due to the diversity of the injected medium. The produced water comprises polymer, ternary agent, surface polymerization agent and low-temperature gathering and transporting station-entering sewage; well washing water, water injection pipeline flushing water and ground oil treatment sewage all enter a sewage system for treatment, so that the quality of the obtained outlet water is more and more complex, and the treatment difficulty is increased. After produced water generated in oil extraction development contains chemical substances such as polymers, surfactants and the like, the viscosity of a water phase is increased, oil and water are emulsified seriously, and the oil and water are in an emulsified state in water, so that the oil and water sedimentation separation effect is poor.

The invention content is as follows:

the invention aims to solve the technical problem of poor oil-water sedimentation effect in the background technology, and provides a tank-type oily sewage air-flotation biochemical sedimentation treatment device which makes full use of the existing process equipment and greatly improves the oil-water sedimentation effect.

The invention can solve the problems by the following technical scheme: the oil extraction wastewater treatment device integrating the settling tank, the biology and the dissolved air floatation comprises a tank body, wherein the top of the tank body is provided with a breather valve, an emergency ventilation device port, a hydraulic safety valve port and an explosion-proof exhaust device port, the upper part of the tank body is provided with an oil collecting tank and an upper heating coil, the middle part of the tank body is axially and fixedly provided with a middle partition cylinder, the middle part of the middle partition cylinder is radially communicated with a primary water distribution pipe and a secondary water distribution pipe, the primary water distribution pipe and the secondary water distribution pipe are respectively and uniformly distributed along the circumferential direction of the middle partition cylinder, the outlet of the primary water distribution pipe faces downwards, the lower part of the secondary water distribution pipe is provided with a releaser, the releaser is connected with the outlet end of a dissolved air inlet pipe, the open end of the dissolved air inlet pipe is arranged outside the tank body, an air flotation tank body is arranged outside the middle partition cylinder, the air flotation tank body is composed of an inner contact area tank body and a separation area tank body, the upper outlet of the inner contact area tank body is lower than the upper end surface of the separation area tank body, water outlet holes are uniformly distributed in the middle of the separation area tank body along the circumferential direction, an air flotation internal sludge discharge group is arranged on the bottom surface of the air flotation tank body, a water collecting chamber is separated from the lower part of the middle partition cylinder, the water collecting chamber is communicated with a water collecting manifold, the upper part of the middle partition cylinder is communicated with a water outlet pipe, the water outlet pipe is connected to the outside of a regulating and controlling water tank, a heating coil, an aeration group and a tank bottom sludge discharge group are sequentially arranged on the lower part of the tank body, and the tank bottom sludge discharge group is communicated with the air flotation internal sludge discharge group; a filler frame and a supporting component are fixed in an annular cavity between the tank body and the air floatation tank body, a filler body is arranged on the filler frame, and microorganisms are attached to the filler body.

The regulation and control water tank in the above-mentioned scheme is including the regulation and control water tank body, and the lower part of regulation and control water tank body is equipped with delivery port and backward flow mouth side by side, is equipped with intermediate bottom and flashboard in the regulation and control water tank body axial, and lifting screw is connected to the flashboard upper end, and lifting screw is driven by electrical control device, installs manual regulation wheel on the electrical control device, and regulation and control water tank body up end is equipped with the access hole.

Compared with the prior art, the tank type oily sewage air-floating biological purification treatment device has the advantages that due to the adoption of the structure, the original equipment arranged in the sewage treatment station is fully utilized, the microbial technology is introduced into the old station under the condition that the station is not newly built, and the equipment is respectively combined with the traditional sedimentation, sedimentation air-floating and filtering processes, so that a better treatment effect can be achieved, the equipment investment is saved, and the problem that emulsified oil in the oil extraction sewage is difficult to remove is solved. The dissolved air flotation and the biological purification are integrated and arranged in a tank.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a sewage treatment process according to the present invention;

FIG. 3 is a schematic view of the structure of the biological filler and the frame of the present invention;

FIG. 4 is a schematic view of the regulating tank of FIG. 1;

fig. 5 is a left side view of fig. 4.

In the figure, 1-tank body, 2-air-flotation tank body, 3-regulation water tank, 4-oil collecting tank, 5-upper heating coil, 6-middle partition cylinder, 7-primary water distribution pipe, 8-secondary water distribution pipe, 9-releaser, 10-air-flotation internal mud discharge group, 11-water outlet pipe, 12-dissolved air water inlet pipe, 13-water collection collecting pipe, 14-heating coil, 15-aeration group, 16-tank bottom mud discharge group, 17-breather valve, 18-emergency ventilation device port, 19-hydraulic safety valve port, 20-explosion-proof exhaust device port, 21-filler frame, 22-support component, 23-filler body, 24-water collecting chamber, 25-water inlet pipe, 26-separation zone tank body, 27-internal contact zone tank body, 28-water outlet hole, 29-regulation water tank body, 30-water outlet, 31-backflow port, 32-middle partition plate, 33-maintenance hole, 34-manual regulation wheel, 35-electric regulation device, 36-lifting screw rod and 37-flashboard.

The specific implementation mode is as follows:

the invention will be further explained below with reference to the accompanying drawings:

as shown in the attached figure 1, the oil extraction wastewater treatment device integrating the settling tank, the biology and the dissolved air flotation into a whole comprises a tank body 1, wherein the top of the tank body 1 is provided with a breather valve 17, an emergency ventilation device port 18, a hydraulic safety valve port 19 and an explosion-proof exhaust device port 20, the upper part of the tank body 1 is provided with an oil collecting tank 4 and an upper heating coil 5, the upper heating coil 5 heats the dirty oil floating up in the tank body 1 to prevent the dirty oil from being solidified, the oil collecting tank 4 is convenient to collect and discharge the oil out, a middle partition cylinder 6 is axially fixed in the middle of the tank body 1, a primary water distribution pipe 7 and a secondary water distribution pipe 8 are radially communicated in the middle of the middle partition cylinder 6, the primary water distribution pipe 7 and the secondary water distribution pipe 8 are respectively and uniformly distributed along the circumferential direction of the middle partition cylinder 6, each primary water distribution pipe 7 is divided into two small water outlet pipes with a downward outlet, compared with the existing single water outlet, the multiple water outlets can enable incoming water to be in full contact with dissolved air releasing water, the contact area is increased by dozens of times, bubbles in the dissolved air releasing water can be in contact with dirty oil to facilitate oil removal, and sludge settlement is facilitated. The releaser 9 is connected with the outlet end of the dissolved air inlet pipe 12, the open end of the dissolved air inlet pipe 12 is arranged outside the tank body 1, the air flotation tank body 2 is arranged outside the middle partition cylinder 6, the air flotation tank body 2 is composed of an inner contact area tank body 27 and a separation area tank body 26, the upper outlet of the inner contact area tank body 27 is lower than the upper end surface of the separation area tank body 26, water outlet holes 28 are uniformly distributed in the middle of the separation area tank body 26 along the circumferential direction, after the sewage and the dissolved air released water are fully contacted in the inner contact area tank body 27, sludge is settled and discharged from an air flotation inner sludge discharge group 10, water and oil overflow from the upper port of the air flotation inner sludge discharge group 10 to enter the separation area tank body 26, air is introduced into the separation area tank body 26 for flotation separation, and the air flotation tank body 2 has a double-layer cylinder structure; the lower part of the separation area tank body 26 is in a cone frustum shape, the separation area tank body is provided with a water outlet hole 28, sewage enters the biological treatment area from the water outlet hole, an independent air floatation area in the large tank is formed, dissolved air floatation is integrated in the large biological treatment tank to form a closed flow of air floatation separation and microbial treatment, not only can an ideal sewage treatment effect be achieved, but also the cost can be saved without independently building the large air floatation tank and the microbial treatment tank. The bottom surface of the air-flotation tank body 2 is provided with an air-flotation internal sludge discharge group 10, the lower part of the middle partition cylinder 6 is separated into a water collecting chamber 24, the water collecting chamber 24 is communicated with a water collecting manifold 13, water subjected to air-flotation separation and biological reduction enters the water collecting chamber 24 from the water collecting manifold 13 and then is discharged out from a water outlet pipe 11, the upper part of the middle partition cylinder 6 is communicated with a water outlet pipe 11, the water outlet pipe 11 is connected to a regulating and controlling water tank 3, the lower part of the tank body 1 is sequentially provided with a heating coil 14, an aeration group 15 and a tank bottom sludge discharge group 16, the heating coil 14 heats water, gas-dissolved water is released to the tank body 1 through the aeration group 15, and the tank bottom sludge discharge group 16 is communicated with the air-flotation internal sludge discharge group 10; a filler frame 21 and a supporting component 22 are fixed in an annular cavity between the tank body 1 and the air flotation tank body 2, a filler body 23 is arranged on the filler frame 21, and microorganisms are attached to the filler body 23 and degrade organic matters in sewage to reduce the emulsification of the sewage.

The regulating and controlling water tank 3 comprises a regulating and controlling water tank body 29, a water outlet 30 and a backflow port 31 are arranged on the lower portion of the regulating and controlling water tank body 29 side by side, a middle partition plate 32 and a gate plate 37 are axially arranged in the regulating and controlling water tank body 29, the upper end of the gate plate 37 is connected with a lifting screw 36, the lifting screw 36 is driven by an electric adjusting device 35, a manual adjusting wheel 34 is installed on the electric adjusting device 35, and an access hole 33 is formed in the upper end face of the regulating and controlling water tank body 29. Through level gauge remote control electric adjusting device 35 (perhaps with manual regulating wheel 34 manual regulation) drive lifting screw 36 and then make flashboard 37 promote or descend, the adjusting water tank liquid level makes jar interior liquid level obtain effective control through delivery port 30 and backward flow mouth 31, reaches control oil collecting layer liquid level, guarantees that oil trap 4 high efficiency work in time arranges the oil slick outward.

The oil extraction wastewater treatment device integrating the settling tank, the biology and the dissolved air floatation is used for recovering the dirty oil in the raw water by utilizing the dissolved air principle and carrying out preliminary biological purification and degradation in the tank. The tank is internally provided with a gas dissolving and oil collecting part and a biological purification part, and the gas dissolving and oil collecting part has the following principle: the incoming water enters the middle partition cylinder 6 from the water inlet pipe 25, flows into the separation area through the first water distribution pipe 7 and the second water distribution pipe 8 through the contact area of the dissolved gas oil removal device, and recovers the crude oil in the raw water under the action of slightly soluble gas, and the dirty oil collected by the dissolved gas oil removal part is discharged to the oil storage tank through the oil collecting tank 4 and the oil outlet pipe; the biological purification part principle is as follows: sewage after air floatation and oil removal enters a biological purification settling zone from a dissolved air floatation separation zone, after biological purification treatment is carried out by a biological filler unit under the action of an aeration group 15, outlet water enters a water collecting chamber 24 through a water collecting manifold 13, automatically flows into a regulating and controlling water tank 3 through a water outlet pipe 11, flows out of the tank and enters a subsequent treatment link, floating oil in a biochemical zone is discharged into an oil storage tank through an oil collecting tank 4 and an oil outlet pipe, and dirty oil in the oil storage tank is input into an oil tank in a primary station through a dirty oil pump; sludge in the dissolved air biological purification tank device is collected by a sludge discharge system and is periodically discharged into an internal recovery water tank through a sludge discharge pipe.

Claims

1. The utility model provides a collect settling cask, biology, dissolve gas air supporting oil recovery effluent treatment plant as an organic whole, includes a jar body (1), its characterized in that: the top of the tank body (1) is provided with a breather valve (17), an emergency ventilation device port (18), a hydraulic safety valve port (19) and an explosion-proof exhaust device port (20), the upper part of the tank body (1) is provided with an oil collecting tank (4) and an upper heating coil (5), a middle section cylinder (6) is axially fixed in the middle of the tank body (1), the middle part of the middle section cylinder (6) is radially communicated with a primary water distribution pipe (7) and a secondary water distribution pipe (8), the primary water distribution pipe (7) and the secondary water distribution pipe (8) are respectively and uniformly distributed along the circumferential direction of the middle section cylinder (6), the outlet of the primary water distribution pipe (7) faces downwards, each primary water distribution pipe (7) is divided into two small water outlet pipes and the outlet of the primary water distribution pipes faces downwards, a plurality of water outlets are compared with the existing single water outlet, the incoming water is more fully contacted with dissolved air water, the contact area is increased by dozens of times, the bubbles in the dissolved air release water are more favorably contacted with dirty oil to be favorably deoiling and also be favorable for sludge sedimentation, a releaser (9) is arranged below the secondary water distribution pipe (8), the releaser (9) is connected with a dissolved air water inlet pipe (12), the dissolved air release water inlet pipe (12), the outlet of the releaser is arranged below the tank body, the primary water release pipe (1), the primary water release pipe is arranged upwards, the mixed water release water spray form, the primary water is formed by a main water spray form of an air water spray form and a turbulent water spray form, the secondary water distribution pipe (8) is used for secondary water distribution in a transverse water distribution mode, the transverse injection of the secondary water distribution pipe (8) expands the contact area of the incoming water and the dissolved air water, and simultaneously, the contact time of the incoming water and the dissolved air water is increased, so that the dissolved air floatation separation effect is better through the arrangement; an air flotation tank body (2) is arranged outside a middle partition cylinder (6), the air flotation tank body (2) consists of an internal contact area tank body (27) and a separation area tank body (26), an upper outlet of the internal contact area tank body (27) is lower than the upper end surface of the separation area tank body (26), water outlets (28) are uniformly distributed in the middle of the separation area tank body (26) along the circumferential direction, an air flotation internal sludge discharge group (10) is arranged on the bottom surface of the air flotation tank body (2), sewage and dissolved air released water are fully contacted in the internal contact area tank body (27), sludge is discharged from the air flotation internal sludge discharge group (10) after settling, water and oil overflow from the upper opening of the air flotation internal sludge discharge group (10) to enter the separation area tank body (26), air inflow and floatation separation are carried out in the separation area tank body (26), a water collection chamber (24) is isolated at the lower part of the middle partition cylinder (6), the water collection chamber (24) is communicated with a water collection pipe (13), a water outlet pipe (11) is communicated with the upper part of the middle partition cylinder (6), the water outlet pipe (11) is connected to an adjusting and water tank (3) and is discharged, a discharge pipe (14) is sequentially arranged at the lower part of the tank body (1), a water discharge pipe (16), and a tank body (16) is communicated with an aeration tank body (16) and communicated with the internal sludge discharge group (16); a packing frame (21) and a supporting component (22) are fixed in an annular cavity between the tank body (1) and the air flotation tank body (2), a packing body (23) is arranged on the packing frame (21), and microorganisms are attached to the packing body (23); the separation area jar body is opened has apopore (28) sewage and gets into the biological treatment district from this, form the independent air supporting region in the big jar, will dissolve the air supporting integration and form an air supporting separation and the airtight flow of microbial treatment in the big jar of biological treatment, can reach ideal sewage treatment effect, can practice thrift the cost again and need not build big jar of air supporting and microbial treatment pond alone, make full use of original equipment in the sewage treatment station, under the condition of not newly-built station, introduce filler frame (21) in the old station, with traditional subside, subside air supporting and filtration technology combination, can reach better treatment effect, equipment investment has been saved, the difficult problem that emulsified oil is difficult to get rid of in the oil recovery sewage has been solved, dissolve air supporting and biological purification integration and arrange in a jar.

2. The oil recovery wastewater treatment device integrating the settling tank, the biology and the dissolved air floatation as a whole as claimed in claim 1, characterized in that: the regulating and controlling water tank (3) comprises a regulating and controlling water tank body (29), the lower part of the regulating and controlling water tank body (29) is provided with a water outlet (30) and a backflow port (31) side by side, a middle partition plate (32) and a flashboard (37) are axially arranged in the regulating and controlling water tank body (29), the upper end of the flashboard (37) is connected with a lifting screw (36), the lifting screw (36) is driven by an electric regulating device (35), a manual regulating wheel (34) is installed on the electric regulating device (35), and the upper end face of the regulating and controlling water tank body (29) is provided with an access hole (33); through level gauge remote control electric adjusting device (35) or with manual regulating wheel (34) manual regulation drive lifting screw (36) and then make flashboard (37) promote or descend, the adjusting water tank liquid level makes jar interior liquid level obtain effective control through delivery port (30) and backward flow mouth (31), reaches control oil collecting layer liquid level, guarantees that oil trap (4) high efficiency work in time arranges the external row of oil slick.