CN212655650U - Petrochemical effluent disposal system - Google Patents

Petrochemical effluent disposal system Download PDF

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Publication number
CN212655650U
CN212655650U CN202020986771.3U CN202020986771U CN212655650U CN 212655650 U CN212655650 U CN 212655650U CN 202020986771 U CN202020986771 U CN 202020986771U CN 212655650 U CN212655650 U CN 212655650U
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tank
area
pipe
sludge
water
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钱丽萍
周浩
董志超
顾芬
吴曦曦
葛飞
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JIANGSU HUIJIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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JIANGSU HUIJIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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Abstract

The utility model discloses a petrochemical wastewater treatment system, which comprises a dosing device, and a demulsification oil-separation precipitation tank, an air flotation tank, a first water collecting well, an adjusting tank, an anoxic tank, an aerobic tank, a precipitation tank and a discharge tank which are connected in sequence; the demulsification oil-separation settling tank is internally divided into a demulsification area, a mixed flocculation area and an inclined plate settling area; the inside of the air flotation tank is divided into a slag scraping area and a water outlet area; the overflow tank at the top of the inclined plate sedimentation zone is communicated with a water inlet at the lower part of the side wall of the slag scraping zone through a water conveying pipeline; an inclined flow buffering plate is arranged at the water inlet, and an air floatation area with a large upper part and a small lower part is formed between the inclined flow buffering plate and the side wall where the water inlet is located; the system has scientific structural design, low energy consumption of the air flotation tank and low operation cost.

Description

Petrochemical effluent disposal system
Technical Field
The utility model relates to a waste water treatment field especially relates to a petrochemical effluent disposal system.
Background
Petrochemical wastewater refers to wastewater discharged from a petrochemical plant; the water content of the waste water is large, and the waste water contains cooling water and other water besides the production waste water; the components of the wastewater are complex, and the properties of the wastewater are complex and changeable due to the complex reaction process and unit operation of various petrochemical products.
At present, the treatment of the wastewater generally includes physical and chemical treatment, biochemical treatment and advanced treatment. The physicochemical treatment mainly comprises methods such as coagulation, chemical precipitation, air flotation and the like to remove part of oil pollutants; the air floatation tank is a tank which mainly uses a large amount of micro bubbles to capture and adsorb fine particle adhesive substances to enable the fine particle adhesive substances to float upwards so as to achieve the effect of solid-liquid separation, and a large amount of micro bubbles are generated according to the area of the air floatation tank and a plurality of aeration heads are required to be arranged at the bottom of the tank, so that the energy consumption of the air floatation tank is higher; furthermore, since the waste water from petrochemical plants is domestic waste water in addition to production waste water, it is obviously inappropriate to use the same treatment process, which not only increases the treatment cost but also extends the treatment period.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of prior art, providing a structural design science, the air supporting groove energy consumption is low, a petrochemical effluent disposal system that the running cost is low.
In order to realize the purpose of the utility model, the technical proposal of the utility model is that:
a petrochemical wastewater treatment system comprises a dosing device, and a demulsification oil-separation precipitation tank, an air flotation tank, a first water collecting well, an adjusting tank, an anoxic tank, an aerobic tank, a precipitation tank and a discharge tank which are connected in sequence; the demulsification oil-separation settling tank is internally divided into a demulsification area, a mixed flocculation area and an inclined plate settling area; the inside of the air flotation tank is divided into a slag scraping area and a water outlet area; the overflow tank at the top of the inclined plate sedimentation zone is communicated with a water inlet at the lower part of the side wall of the slag scraping zone through a water conveying pipeline; an inclined flow buffering plate is arranged at the water inlet, and an air floatation area with a large upper part and a small lower part is formed between the inclined flow buffering plate and the side wall where the water inlet is located; the bottom of the slag scraping area is provided with a water collecting pipe which is communicated with the bottom of the water outlet area; the bottom of the water outlet zone is also provided with a first return pipe, the end part of the other end of the first return pipe is provided with an aeration head and extends to the bottom of the air floatation zone, and the first return pipe is provided with a dissolved air pump; the slag scraping device is characterized in that a slag scraping trolley is arranged at the top of the slag scraping area, a slag discharging groove is formed in the upper portion of the side wall of the slag scraping area, a slag discharging pipe is arranged at the bottom of the slag discharging groove, and the slag discharging pipe is connected with a sludge groove.
Preferably, the dosing device comprises a plurality of stirring tanks; a pipeline mixer is arranged on the water conveying pipeline; the top of the demulsification area, the top of the mixed flocculation area and the pipeline mixer are all connected with the stirring tank through dosing pipes, and metering pumps are arranged on the dosing pipes.
Preferably, a first filler area is arranged in the anoxic tank, a second filler area is arranged in the aerobic tank, a second return pipe is arranged in the aerobic tank, one end of the second return pipe is connected with a return pump at the bottom of the aerobic tank, the other end of the second return pipe extends into the anoxic tank, and aeration devices are further arranged at the bottom of the anoxic tank and the bottom of the aerobic tank.
Preferably, a central guide cylinder is arranged in the sedimentation tank, a first sludge discharge pipe is arranged at the bottom of the sedimentation tank, the upper part of the central guide cylinder is communicated with the upper part of the side wall of the aerobic tank, and the first sludge discharge pipe is connected with the sludge tank.
Preferably, the bottom of the inclined plate sedimentation zone is provided with a second sludge discharge pipe, and the second sludge discharge pipe is connected with a sludge tank.
Preferably, a sludge outlet pipeline is arranged at the bottom of the sludge tank, the other end of the sludge outlet pipeline is connected with a sludge dewatering machine, and a pneumatic diaphragm pump is arranged on the sludge outlet pipeline; a liquid outlet pipe is arranged at the upper part of the side wall of the sludge tank and is connected with the second water collecting well; and a third return pipe is arranged in the second water collecting well, one end of the third return pipe is connected with a lifting pump at the bottom of the second water collecting well, and the other end of the third return pipe is connected with a demulsification area of the demulsification oil-separation settling tank.
The utility model has the advantages that:
firstly, the method comprises the following steps: the device is characterized in that a demulsification oil separation precipitation tank, an air flotation tank, a first water collecting well, an adjusting tank, an anoxic tank, an aerobic tank, a precipitation tank and a discharge tank are sequentially arranged, production wastewater enters the demulsification oil separation precipitation tank to start treatment, domestic wastewater enters the first water collecting well to start treatment, and the production wastewater and the domestic wastewater enter a treatment flow after being subjected to early oil and slag removal treatment, so that the structure is scientific and reasonable, two treatment systems are not required to be arranged, and the cost is saved;
secondly, the method comprises the following steps: the inclined flow-buffering plate is arranged in the air flotation tank, and an air flotation area with a large top and a small bottom is formed between the inclined flow-buffering plate and the side wall where the water inlet is positioned, so that the whole air flotation tank is not required to be aerated, the air flotation aeration range is reduced, the energy consumption is low, and the treatment cost is saved;
thirdly, the method comprises the following steps: the supernatant in the sludge tank enters the second water collecting well, then flows back again to enter the treatment process, secondary pollution can be avoided, and sludge in the sludge tank is transported outside after being dehydrated.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1 is a demulsification oil-separation settling tank, 1.1 is a demulsification zone, 1.2 is a mixed flocculation zone, 1.3 is an inclined plate settling zone, 1.4 is a second sludge discharge pipe, 2 is an air flotation tank, 2.1 is a slag scraping zone, 2.2 is a water outlet zone, 2.3 is an inclined flow-slowing plate, 2.4 is an air flotation zone, 2.5 is a water collecting pipe, 2.6 is a first return pipe, 2.7 is an aeration head, 2.8 is a dissolved air pump, 2.9 is a slag scraping trolley, 2.10 is a slag discharging tank, 2.11 is a slag discharging pipe, 3 is a first water collecting well, 4 is a regulating tank, 5 is an anoxic tank, 5.1 is a first filling zone, 6 is an aerobic tank, 6.1 is a second filling zone, 6.2 is a second return pipe, 6.3 is a return pump, 7 is a settling tank, 7.1 is a central guide cylinder, 7.2 is a first sludge discharge pipe, 8 is a discharge tank, 9.1 is a sludge discharge tank, 9.2.2 is a sludge feeding tank, 10.10 mixing device, 10.10 is a sludge adding device, 10.10 a sludge adding device, 10 is a sludge adding, 13 is an air operated diaphragm pump, 14 is a second sump, 14.1 is a third return pipe, 14.2 is a lift pump.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
A petrochemical industry wastewater treatment system comprises a dosing device 10, and a demulsification oil-separation precipitation tank 1, an air flotation tank 2, a first water collecting well 3, an adjusting tank 4, an anoxic tank 5, an aerobic tank 6, a precipitation tank 7 and a discharge tank 8 which are connected in sequence; the demulsification oil-separation settling tank 1 is internally divided into a demulsification area 1.1, a mixed flocculation area 1.2 and an inclined plate settling area 1.3; the inside of the air flotation tank 2 is divided into a slag scraping area 2.1 and a water outlet area 2.2; the overflow tank at the top of the inclined plate sedimentation zone 1.3 is communicated with a water inlet at the lower part of the side wall of the slag scraping zone 2.1 through a water delivery pipeline; an inclined flow buffering plate 2.3 is arranged at the water inlet, and an air floatation area 2.4 with a large upper part and a small lower part is formed between the inclined flow buffering plate 2.3 and the side wall where the water inlet is positioned; a water collecting pipe 2.5 is arranged at the bottom of the slag scraping area 2.1, and the water collecting pipe 2.5 is communicated with the bottom of the water outlet area 2.2; the bottom of the water outlet zone 2.2 is also provided with a first return pipe 2.6, the end part of the other end of the first return pipe 2.6 is provided with an aeration head 2.7 and extends to the bottom of the air floatation zone 2.4, and the first return pipe 2.6 is provided with a dissolved air pump 2.8; scrape sediment district 2.1 top and set up and scrape sediment dolly 2.9, scrape sediment district 2.1 lateral wall upper portion and set up slag notch 2.10, slag notch 2.10 bottom sets up slag pipe 2.11, slag pipe 2.11 is connected with sludge impoundment 9.
Preferably, the dosing device 10 comprises a plurality of stirring tanks 10.1; the water conveying pipeline is provided with a pipeline mixer 11; the top of the breast breaking area 1.1, the top of the mixed flocculation area 1.2 and the pipeline mixer 11 are all connected with a stirring tank 10.1 through a dosing pipe 10.2, and a metering pump 10.3 is arranged on the dosing pipe 10.2; the stirring tank 10.1 can be arranged according to the types of added medicaments (including alkali, demulsifier, PAC, PAM and the like), and a stirring paddle is arranged in the stirring tank 10.1 and is used for mixing and dissolving the medicaments; a demulsifier and alkali are added into the demulsification area 1.1 through a dosing pipe 10.2; PAC and PAM are added into the mixed flocculation zone 1.2; PAC, PAM and alkali are added into the pipeline mixer 11.
Preferably, a first filler area 5.1 is arranged in the anoxic tank 5, a second filler area 6.1 is arranged in the aerobic tank 6, a second return pipe 6.2 is arranged in the aerobic tank 6, one end of the second return pipe 6.2 is connected with a return pump 6.3 at the bottom of the aerobic tank 6, the other end extends into the anoxic tank 5, and aeration devices are further arranged at the bottoms of the anoxic tank 5 and the aerobic tank 6; the aeration device is the prior art, and generally comprises an aeration fan and perforated aeration pipes which are laid at the bottoms of the anoxic tank 5 and the aerobic tank 6, and the details are not repeated here.
Preferably, a central guide shell 7.1 is arranged in the sedimentation tank 7, a first sludge discharge pipe 7.2 is arranged at the bottom of the sedimentation tank, the upper part of the central guide shell 7.1 is communicated with the upper part of the side wall of the aerobic tank 6, and the first sludge discharge pipe 7.2 is connected with a sludge tank 9.
Preferably, the bottom of the inclined plate sedimentation zone 1.3 is provided with a second sludge discharge pipe 1.4, and the second sludge discharge pipe 1.4 is connected with a sludge tank 9.
Preferably, a sludge outlet pipeline 9.1 is arranged at the bottom of the sludge tank 9, the other end of the sludge outlet pipeline 9.1 is connected with a sludge dewatering machine 12, and a pneumatic diaphragm pump 13 is arranged on the sludge outlet pipeline 9.1; a liquid outlet pipe 9.2 is arranged at the upper part of the side wall of the sludge tank 9, and the liquid outlet pipe 9.2 is connected with a second water collecting well 14; a third return pipe 14.1 is arranged in the second water collecting well 14, one end of the third return pipe 14.1 is connected with a lift pump 14.2 at the bottom of the second water collecting well 14, and the other end is connected with a demulsification area 1.1 of the demulsification oil-separation settling tank 1.
The working principle of the system is as follows:
the production wastewater firstly enters a demulsification oil separation settling tank 1, a stirring tank 10.1 adds medicaments to a demulsification area 1.1 and a mixed flocculation area 1.2 through a medicament adding pipe 10.2, the production wastewater enters an inclined plate settling area 1.3 after demulsification and mixed flocculation are completed, the production wastewater enters an air flotation tank 2 along a water pipeline after being settled, the medicaments are added into the wastewater again through a pipeline mixer 11 before entering the air flotation tank 2, particulate matters in the wastewater after entering the air flotation tank 2 are wrapped and carried by bubbles in the air flotation area 2.4, so that the emulsified oil, micro suspended particles and other pollutant substances in the wastewater are adhered to the bubbles and float to the water surface along with the bubbles, the production wastewater is scraped to a slag discharging tank 2.10 through a slag scraping trolley 2.9, and then enters a sludge tank 9 along a slag discharging pipe 2.11; the produced wastewater after the treatment enters a first water collecting well 3; domestic wastewater in a plant area is also discharged into the first water collecting well 3, the flow and the concentration are regulated through the regulating tank 4, then the domestic wastewater enters the precipitation tank 7 through the anoxic and aerobic treatments of the anoxic tank 5 and the aerobic tank 6, supernatant of the precipitation tank 7 enters the discharge tank 8, sludge at the bottom of the precipitation tank 7 is discharged into the sludge tank 9 through the first sludge discharge pipe 7.2, sludge at the bottom of the inclined plate precipitation zone 1.3 is discharged into the sludge tank 9 through the second sludge discharge pipe 1.4, sludge in the sludge tank 9 is pumped to the sludge dewatering machine 12 through the pneumatic diaphragm pump 13 for dewatering, the dewatered sludge can be transported outwards, wastewater generated by dewatering can be discharged into the second water collecting well 14, wastewater in the sludge tank 9 is discharged into the second water collecting well 14 through the liquid outlet pipe 9.2, and wastewater in the second water collecting well 14 is pumped into the demulsification zone 1.1 through the third backflow pipe 14.1 and the lifting pump 14.2 for secondary treatment.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims (6)

1. A petrochemical wastewater treatment system is characterized in that: comprises a dosing device (10), and a demulsification oil-separation precipitation tank (1), an air flotation tank (2), a first water collecting well (3), an adjusting tank (4), an anoxic tank (5), an aerobic tank (6), a precipitation tank (7) and a discharge tank (8) which are connected in sequence; the demulsification oil-separation settling tank (1) is internally divided into a demulsification area (1.1), a mixed flocculation area (1.2) and an inclined plate settling area (1.3); the inside of the air flotation tank (2) is divided into a slag scraping area (2.1) and a water outlet area (2.2); the overflow tank at the top of the inclined plate sedimentation zone (1.3) is communicated with a water inlet at the lower part of the side wall of the slag scraping zone (2.1) through a water delivery pipeline; an inclined flow buffering plate (2.3) is arranged at the water inlet, and an air floating area (2.4) with a large upper part and a small lower part is formed between the inclined flow buffering plate (2.3) and the side wall where the water inlet is positioned; the bottom of the slag scraping area (2.1) is provided with a water collecting pipe (2.5), and the water collecting pipe (2.5) is communicated with the bottom of the water outlet area (2.2); a first return pipe (2.6) is also arranged at the bottom of the water outlet area (2.2), an aeration head (2.7) is arranged at the end part of the other end of the first return pipe (2.6) and extends to the bottom of the air floatation area (2.4), and a dissolved air pump (2.8) is arranged on the first return pipe (2.6); scrape slag zone (2.1) top and set up and scrape sediment dolly (2.9), scrape slag zone (2.1) lateral wall upper portion and set up slag notch (2.10), slag notch (2.10) bottom sets up slag pipe (2.11), slag pipe (2.11) are connected with sludge impoundment (9).
2. The petrochemical wastewater treatment system according to claim 1, wherein: the dosing device (10) comprises a plurality of stirring tanks (10.1); a pipeline mixer (11) is arranged on the water conveying pipeline; breast breast portion (1.1) top, mix flocculation district (1.2) top and pipeline mixer (11) all are connected with agitator tank (10.1) through dosing pipe (10.2), set up measuring pump (10.3) on dosing pipe (10.2).
3. The petrochemical wastewater treatment system according to claim 1, wherein: set up first filler district (5.1) in oxygen deficiency groove (5), set up second filler district (6.1) in good oxygen groove (6), set up second back flow (6.2) in good oxygen groove (6), second back flow (6.2) one end is connected with backwash pump (6.3) of good oxygen groove (6) bottom, and the other end extends in oxygen deficiency groove (5), oxygen deficiency groove (5) and good oxygen groove (6) bottom still set up aeration equipment.
4. The petrochemical wastewater treatment system according to claim 1, wherein: set up central draft tube (7.1) in precipitation tank (7), the bottom sets up first mud pipe (7.2), central draft tube (7.1) upper portion and good oxygen groove (6) lateral wall upper portion intercommunication, first mud pipe (7.2) are connected with sludge impoundment (9).
5. The petrochemical wastewater treatment system according to claim 1, wherein: the bottom of the inclined plate sedimentation zone (1.3) is provided with a second sludge discharge pipe (1.4), and the second sludge discharge pipe (1.4) is connected with a sludge tank (9).
6. The petrochemical wastewater treatment system according to claim 1, 4 or 5, wherein: a sludge outlet pipeline (9.1) is arranged at the bottom of the sludge tank (9), the other end of the sludge outlet pipeline (9.1) is connected with a sludge dewatering machine (12), and a pneumatic diaphragm pump (13) is arranged on the sludge outlet pipeline (9.1); a liquid outlet pipe (9.2) is arranged at the upper part of the side wall of the sludge tank (9), and the liquid outlet pipe (9.2) is connected with a second water collecting well (14); a third return pipe (14.1) is arranged in the second water collecting well (14), one end of the third return pipe (14.1) is connected with a lifting pump (14.2) at the bottom of the second water collecting well (14), and the other end of the third return pipe is connected with a demulsification area (1.1) of the demulsification oil-separation settling tank (1).
CN202020986771.3U 2020-06-03 2020-06-03 Petrochemical effluent disposal system Active CN212655650U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020986771.3U CN212655650U (en) 2020-06-03 2020-06-03 Petrochemical effluent disposal system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020986771.3U CN212655650U (en) 2020-06-03 2020-06-03 Petrochemical effluent disposal system

Publications (1)

Publication Number Publication Date
CN212655650U true CN212655650U (en) 2021-03-05

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ID=74752378

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Application Number Title Priority Date Filing Date
CN202020986771.3U Active CN212655650U (en) 2020-06-03 2020-06-03 Petrochemical effluent disposal system

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Country Link
CN (1) CN212655650U (en)

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