CN106746364B - Oil field produced water recycling method and device - Google Patents
Oil field produced water recycling method and device Download PDFInfo
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- CN106746364B CN106746364B CN201710079809.1A CN201710079809A CN106746364B CN 106746364 B CN106746364 B CN 106746364B CN 201710079809 A CN201710079809 A CN 201710079809A CN 106746364 B CN106746364 B CN 106746364B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
Abstract
The invention discloses a recycling method of oilfield produced water, which comprises the following steps of (1) pumping oilfield produced water into a gravity oil removal tank, and separating and respectively removing macromolecular oil drops, water and solid suspended matters; (2) Then the water passes through a cavitation air floatation machine, and bubbles in the water bring out oil drops in the water; (3) Delivering the effluent of the cavitation air floatation machine into a dissolved air floatation machine, and removing emulsified oil and dissolved oil in the water again; (4) Then the water is conveyed to an immobilized microorganism treatment tank, and the effluent enters an intermediate water tank I; (5) then pumping into an MBR unit; (6) And the effluent of the MBR device is filtered by a cartridge filter after passing through an intermediate water tank II and directly enters a reverse osmosis device for treatment or an electrodialysis device for treatment. The oil substances such as oil beads with large particle size, emulsified oil and dissolved oil are basically removed by adopting a gravity oil removal tank, a cavitation air floatation machine and a dissolved air floatation machine which are mutually promoted and supplemented in sequence; compared with the traditional biochemical treatment process, the immobilized microorganism treatment tank has better treatment effect.
Description
Technical field:
the invention relates to the technical field of water treatment, in particular to a recycling method and device for oilfield produced water, which realize recycling of oilfield produced water.
The background technology is as follows:
oil field oil extraction techniques are mainly divided into primary, secondary and tertiary oil extraction techniques. Primary oil recovery is mainly realized by self-injection of oil, secondary oil recovery is a technology of injecting water into an oil layer, maintaining a certain pressure and extracting water and oil together, and tertiary oil recovery is a technology of improving oil recovery rate by changing the property of injected water. The latter two technologies are mainly used at present. The application of the latter two technologies can generate a large amount of petroleum produced water, the produced water has large water yield and high water content, and the water contains a large amount of pollutants such as oil, suspended matters, organic matters and the like, and if the water is directly refilled or discharged, serious pollution is caused to the environment, and the water is refilled or utilized after further treatment. The common oily wastewater treatment flow is as follows: produced water, sedimentation separation, filtering and deoiling, and yielding water. The effluent of the treatment process is generally used for recharging, the quality of the effluent is poor, and the waste of water resources and energy is caused. If the produced water is deeply treated and recycled, the method can be used for water using links such as oil field boiler water, etc., not only avoiding the waste of water resources, but also being beneficial to environmental protection. Chinese patent CN2012101796584 discloses a method for treating and recycling oilfield produced water, which sequentially passes through an oil removal precipitation device, an air floatation device, a filtering device and a DTRO membrane device, and an anti-pollution DTRO membrane device is adopted as a deep treatment device, however, as the process of the pretreatment process is simpler, the organic matter content in the water discharged from the filtering device is higher, the reverse osmosis membrane pollution in the actual use process is still a main problem, and in addition, the higher cost of the anti-pollution reverse osmosis membrane material is also a bottleneck restricting the popularization of the process. Chinese patent CN20101051114392 discloses a treatment method for recycling oilfield produced water, in which the produced sewage is sequentially subjected to weight sedimentation, air floatation degreasing, activated sludge treatment, contact oxidation tank, double-material filtration, lamination filtration, ultrafiltration and reverse osmosis treatment, and although the process is further improved, a large amount of sludge is generated in the processes of activated sludge treatment and contact oxidation treatment, and the problem of sludge treatment is introduced.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, provides a recycling method and a recycling device for oilfield produced water, and solves the problems that the front end pretreatment is insufficient in the existing advanced treatment process of oilfield produced water, so that the cost of the subsequent advanced treatment process is high, or a large amount of sludge is generated in the biochemical treatment process to be introduced into sludge treatment and the like.
In order to achieve the purpose, the invention relates to a recycling method for oilfield produced water, which specifically comprises the following steps:
(1) Pumping the oilfield produced water stored in the wastewater tank into a gravity oil removal tank, separating and respectively removing macromolecular oil drops, water and solid suspended matters through gravity sedimentation;
(2) The water discharged from the gravity oil removal tank passes through a cavitation air floatation machine, air bubbles are injected into the water by an aeration device in the cavitation air floatation machine, and the air bubbles uniformly distributed in the water bring out oil drops in the water;
(3) Delivering the effluent of the cavitation air floatation machine into a dissolved air floatation machine, and removing emulsified oil and dissolved oil in the water again, wherein the petroleum removal rate in the oilfield produced water after the three-step treatment reaches more than 96%;
(4) The water treated by the dissolved air flotation machine is conveyed to an immobilized microorganism treatment tank, and the effluent enters an intermediate water tank I;
(5) Pumping the effluent of the middle pool I into an MBR device, wherein the MBR device is an integrated MBR device, and an anti-pollution curtain type hollow fiber ultrafiltration membrane is adopted to facilitate the subsequent cleaning of membrane materials, and the effluent of the MBR device meets the requirement of oil field water for standard discharge and can be reused as process recharging water;
(6) And the effluent of the MBR device is filtered by a cartridge filter after passing through an intermediate water tank II and directly enters a reverse osmosis device for treatment or an electrodialysis device for treatment.
Further, a sand filtration layer, an aerobic fixed microorganism layer, an anaerobic fixed microorganism layer and an active carbon adsorption layer are sequentially arranged in the immobilized microorganism pool from top to bottom, an aerobic degreasing engineering bacterium is fixed on the aerobic fixed microorganism layer, an anaerobic degreasing engineering bacterium is fixed on the anaerobic fixed microorganism layer, organic matters in water are degraded through the immobilized microorganism treatment pool, macromolecular organic matters are degraded, small molecular organic matters are adsorbed, the residual small amount of dissolved oil is removed, the solid suspended matter removal rate is 85%, and the COD removal rate is more than 75%.
The invention relates to an oilfield produced water recycling device which comprises a water inlet tank, a lifting pump, a gravity oil removal tank, a cavitation air floatation machine, a first lifting pump, a dissolved air floatation machine, an immobilized microorganism treatment tank, a middle water tank I, a second lifting pump, an MBR device, a lifting pump, a middle water tank II, a water pump, a security filter, a reverse osmosis system and a water production tank, wherein a water outlet at the bottom of the water inlet tank is communicated with the top of the gravity oil removal tank through the first lifting pump, a water outlet pipe at the side edge of the gravity oil removal tank is communicated with a water inlet pipeline at the bottom of the cavitation air floatation machine, a water outlet of the cavitation air floatation machine is communicated with a water inlet at the top of the dissolved air floatation machine through the lifting pump, a water outlet at the upper part of the dissolved air floatation machine is communicated with a pipeline of the immobilized microorganism treatment tank I, the second lifting pump is communicated with the middle water tank I, the water outlet of the MBR device is connected with a water inlet of the security filter through the water pump, and the security filter is connected with the water inlet of the reverse osmosis water or connected with a water inlet of an electrodialysis device.
Compared with the prior art, the invention has the following advantages: (1) The oil substances such as oil beads with large particle size, emulsified oil and dissolved oil are basically removed by adopting a gravity oil removal tank, a cavitation air floatation machine and a dissolved air floatation machine which are mutually promoted and supplemented in sequence; (2) Compared with the traditional biochemical treatment process, the immobilized microorganism treatment tank has better treatment effect.
Description of the drawings:
fig. 1 is a process flow diagram of a method for recycling oilfield produced water according to example 1.
Fig. 2 is a process flow diagram of a method for recycling oilfield produced water according to example 2.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and examples.
Example 1:
as shown in fig. 1, the method for recycling oilfield produced water according to the embodiment specifically includes the following steps:
(1) Pumping the oilfield produced water stored in the wastewater tank into a gravity oil removal tank, separating and respectively removing macromolecular oil drops, water and solid suspended matters through gravity sedimentation;
(2) The water discharged from the gravity oil removal tank passes through a cavitation air floatation machine, air bubbles are injected into the water by an aeration device in the cavitation air floatation machine, and the air bubbles uniformly distributed in the water bring out oil drops in the water;
(3) Delivering the effluent of the cavitation air floatation machine into a dissolved air floatation machine, and removing emulsified oil and dissolved oil in the water again, wherein the petroleum removal rate in the oilfield produced water after the three-step treatment reaches more than 96%;
(4) The water treated by the dissolved air flotation machine is conveyed to an immobilized microorganism treatment tank, a sand filtration layer, an aerobic immobilized microorganism layer, an anaerobic immobilized microorganism layer and an active carbon adsorption layer are sequentially arranged in the immobilized microorganism tank from top to bottom, aerobic degreasing engineering bacteria are fixed on the aerobic immobilized microorganism layer, anaerobic degreasing engineering bacteria are fixed on the anaerobic immobilized microorganism layer, organic matters in the water treated by the immobilized microorganism treatment tank are degraded, macromolecular organic matters are degraded, micromolecular organic matters are adsorbed, the residual small amount of dissolved oil is removed, the solid suspended matters are removed by 85%, the COD (chemical oxygen demand) removal rate is more than 75%, and the effluent enters an intermediate water tank I;
(5) The MBR device is pumped into the middle pond I effluent, the MBR device is an integrated MBR device, an anti-pollution curtain type hollow fiber ultrafiltration membrane is adopted to facilitate the subsequent cleaning of membrane materials, water flows into the MBR membrane pond and is subjected to biochemical treatment again, organic matter is degraded, the total removal rate of COD reaches more than 95%, the removal rate of solid suspended matters is 90%, and the MBR device is used for discharging water: COD 40-80mg/L, petroleum less than 0.05mg, conductivity 15600us/cm, SS 108mg/L, meets the requirement of reverse osmosis water quality, and the effluent of the MBR device meets the requirement of oil field water standard discharge, and can be reused as process recharging water;
(6) The effluent of the MBR device is filtered by a cartridge filter after passing through an intermediate water tank II and directly enters a reverse osmosis device for treatment, and the effluent of the reverse osmosis device is: COD is 2-5mg/L, petroleum is not detected, conductivity is 120-160us/cm, SS is not detected, and the water quality standard of the water for the boiler is met.
The embodiment relates to an oilfield produced water recycling device, which comprises a water inlet tank 1, a lifting pump 2, a gravity oil removal tank 3, a cavitation air floatation machine 4, a first lifting pump 5, a dissolved air floatation machine 6, an immobilized microorganism treatment tank 7, an intermediate tank I8, a second lifting pump 9, an MBR device 10, a lifting pump 11, an intermediate tank II12, a water pump 13, a security filter 14, a reverse osmosis system 15 and a water production tank 16, wherein a water outlet at the bottom of the water inlet tank 1 is communicated with the top of the gravity oil removal tank 3 through the first lifting pump 2, a water outlet pipe at the side edge of the gravity oil removal tank 3 is communicated with a water inlet pipeline at the bottom of the cavitation air floatation machine 4, a water outlet of the cavitation air floatation machine 4 is communicated with a water inlet at the top of the dissolved air floatation machine 6 through the lifting pump 5, a water outlet at the upper part of the dissolved air floatation machine 6 is communicated with the immobilized microorganism treatment tank 7 through a pipeline, the immobilized microorganism treatment tank 7 is communicated with the intermediate tank I8 through a pipeline, the second lifting pump 9 communicates the intermediate tank I8 with the MBR device 10, the water outlet of the MBR device 10 is connected with a water inlet of the security filter 14 through the water pump 13, and the security filter 14 is connected with a water inlet of the security filter 14 through the water outlet, and the reverse osmosis filter 15 is connected with the water inlet of the security filter 15.
Further, a sand filtration layer 17, an aerobic fixed microorganism layer 18, an anaerobic fixed microorganism layer 19 and an activated carbon adsorption layer 20 are sequentially arranged in the immobilized microorganism treatment tank 7 from top to bottom, the aerobic degreasing engineering bacteria are fixed on the aerobic fixed microorganism layer 18, and the anaerobic degreasing engineering bacteria are fixed on the anaerobic fixed microorganism layer 19.
Example 2:
as shown in fig. 2, this embodiment is the same as embodiment 1 except that step (6) is the same as embodiment 1.
(6) The effluent of the MBR device is filtered by a cartridge filter after passing through an intermediate water tank II and directly enters an electrodialysis device for treatment, and the effluent of the electrodialysis device is treated: COD is 20-30mg/L, conductivity is 110-145us/cm, and the water can be used as reuse water.
The embodiment relates to an oilfield produced water recycling device, which comprises a water inlet tank 1, a lifting pump 2, a gravity oil removal tank 3, a cavitation air floatation machine 4, a first lifting pump 5, a dissolved air floatation machine 6, an immobilized microorganism treatment tank 7, an intermediate tank I8, a second lifting pump 9, an MBR device 10, a lifting pump 11, an intermediate tank II12, a water pump 13, a security filter 14, an electrodialysis system 15' and a water production tank 16, wherein a water outlet at the bottom of the water inlet tank 1 is communicated with the top of the gravity oil removal tank 3 through the first lifting pump 2, a water outlet pipe at the side edge of the gravity oil removal tank 3 is communicated with a water inlet pipeline at the bottom of the cavitation air floatation machine 4, a water outlet of the cavitation air floatation machine 4 is communicated with a water inlet at the top of the dissolved air floatation machine 6 through the lifting pump 5, a water outlet at the upper part of the dissolved air floatation machine 6 is communicated with the immobilized microorganism treatment tank 7 through a pipeline, the immobilized microorganism treatment tank 7 is communicated with the intermediate tank I8 through a pipeline, the second lifting pump 9 communicates the intermediate tank I8 with the MBR device 10, the water outlet of the MBR device 10 is connected with a water inlet of the security filter 14 through the water pump 13, and the security filter 14 is connected with a water inlet of the security filter 14.
Claims (3)
1. The oilfield produced water recycling method is characterized by comprising the following steps of:
(1) Pumping the oilfield produced water stored in the wastewater tank into a gravity oil removal tank, separating and respectively removing macromolecular oil drops, water and solid suspended matters through gravity sedimentation;
(2) The water discharged from the gravity oil removal tank passes through a cavitation air floatation machine, air bubbles are injected into the water by an aeration device in the cavitation air floatation machine, and the air bubbles uniformly distributed in the water bring out oil drops in the water;
(3) Delivering the effluent of the cavitation air floatation machine into a dissolved air floatation machine, and removing emulsified oil and dissolved oil in the water again, wherein the petroleum removal rate in the oilfield produced water after the three-step treatment reaches more than 96%;
(4) The water treated by the dissolved air flotation machine is conveyed to an immobilized microorganism treatment tank, and the effluent enters an intermediate water tank I;
(5) Pumping the effluent of the middle pool I into an MBR device, wherein the MBR device is an integrated MBR device, and an anti-pollution curtain type hollow fiber ultrafiltration membrane is adopted to facilitate the subsequent cleaning of membrane materials, and the effluent of the MBR device meets the requirement of oil field water for standard discharge and can be reused as process recharging water;
(6) And the effluent of the MBR device is filtered by a cartridge filter after passing through an intermediate water tank II and directly enters a reverse osmosis device for treatment or an electrodialysis device for treatment.
2. The method for recycling oilfield produced water according to claim 1, wherein the sand filtration layer, the aerobic immobilized microorganism layer, the anaerobic immobilized microorganism layer and the activated carbon adsorption layer are sequentially arranged in the immobilized microorganism pool from top to bottom, the aerobic degreasing engineering bacteria are fixed on the aerobic immobilized microorganism layer, and the anaerobic degreasing engineering bacteria are fixed on the anaerobic immobilized microorganism layer.
3. The method of recycling oilfield produced water according to claim 1, wherein the oilfield produced water recycling device adopted by the method comprises a water inlet tank, a lifting pump, a gravity oil removal tank, a cavitation air floatation machine, a first lifting pump, a dissolved air floatation machine, an immobilized microorganism treatment tank, an intermediate tank I, a second lifting pump, an MBR device, a lifting pump, an intermediate tank II, a water pump, a security filter, a reverse osmosis system and a water production tank, wherein a water outlet at the bottom of the water inlet tank is communicated with the top of the gravity oil removal tank through the first lifting pump, a water outlet at the side of the gravity oil removal tank is communicated with a water inlet pipeline at the bottom of the cavitation air floatation machine, a water outlet at the upper part of the cavitation air floatation machine is communicated with a water inlet at the top of the dissolved air floatation machine through the lifting pump, a water outlet at the immobilized microorganism treatment tank is communicated with an intermediate tank I pipeline, the second lifting pump communicates the intermediate tank I with an MBR device, a water outlet at the MBR device is connected with a water inlet of the security filter through the water pump, and a water outlet at the security filter is connected with a water inlet of the security filter or is connected with a water inlet of the electrodialysis device.
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| CN107473516A (en) * | 2017-09-13 | 2017-12-15 | 王亚明 | A kind of oil field produced water process skid-mounted device of combined type |
| CN108249654B (en) * | 2018-01-26 | 2021-11-09 | 宁夏宝众帮化工有限公司 | Intelligent petrochemical waste water treatment equipment |
| CN110563273A (en) * | 2019-09-20 | 2019-12-13 | 中国石油化工股份有限公司 | Method for controlling deterioration of oilfield reinjection water along course |
| CN110862201A (en) * | 2019-12-31 | 2020-03-06 | 江苏博大环保股份有限公司 | Gas field water treatment system |
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