CN111362438A - Electro-desalting wastewater oil removal treatment system and process - Google Patents
Electro-desalting wastewater oil removal treatment system and process Download PDFInfo
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Images
Classifications
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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
-
- 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
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides an oil removal treatment system and a process for electric desalting wastewater, wherein the treatment system comprises an oil separation sedimentation tank and a membrane filtering device; the oil separation sedimentation tank is communicated with the membrane filtering device through a connecting pipe, a water supply pump is arranged on the connecting pipe, the water supply pump is used for sending the electric desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank into the membrane filtering device, and the membrane filtering device is used for filtering the precipitated electric desalting wastewater; a settling tank is arranged at the bottom of the oil-separating sedimentation tank; the scheme provided by the invention provides the oil removal treatment process for the electric desalting sewage of the refinery aiming at the defects of unsatisfactory treatment effect, large floor area, high medicament consumption, high sludge production, poor oil removal effect and the like of the existing treatment process, and has the advantages of short treatment process, stable effect, low medicament consumption, containerization, high automation degree and the like.
Description
Technical Field
The invention belongs to the technical field of electro-desalting wastewater oil removal treatment, and particularly relates to an electro-desalting wastewater oil removal treatment system and process.
Background
The electric desalting device is one of indispensable devices in a refinery, and the operation effect of the electric desalting device can affect the long-term, safe and stable operation of an oil refining production device to a great extent. The crude oil desalting process includes adding certain amount of demulsifier and water to dissolve salt in water at certain temperature and separating oil from water under the action of electric field, so as to reach the aim of desalting and dewatering crude oil. Along with the deterioration of crude oil properties at home and abroad, the existing electric desalting device and process are increasingly difficult to control the indexes of the salt content after crude oil removal and the oil content in sewage.
The electro-desalting wastewater is seriously emulsified with oil, and the oil exists in the wastewater in a dispersed state and an emulsified state, so that great influence is brought to subsequent biochemical treatment. Along with the obvious problem of the electric desalting wastewater, the oil removal treatment problem of the electric desalting wastewater draws more attention. The oil removal treatment of the traditional electro-desalting wastewater generally adopts the following steps: the demulsification-separation method comprises the following steps:
demulsification method for electro-desalting wastewater
1. High voltage electric field method
The method utilizes the attraction or repulsion action of electric field force on emulsion particles to make the fine oil particles mutually collide in motion, thereby destroying the hydration film and the double electric layer structure of the fine oil particles, leading the fine oil particles to be coalesced into larger oil particles which float on the water surface and achieving the purpose of oil-water stratification. The high voltage power supply can adopt alternating current, direct current or pulse power supply.
2. Emulsion breaking method by using medicament
The demulsifying agent method is to add demulsifier into the waste water to destroy the hydrated film and electric double layer of oil droplets and to make the oil droplets gather and become larger and separate from water. The demulsification of the agent is divided into salting-out method, coagulation method, salting-out-coagulation mixing method and acidification method; the method specifically comprises the following steps:
(1) salting out method: the salting-out method is to add salt electrolyte into the wastewater to destroy the hydration membrane of oil droplets, and the commonly used electrolyte comprises calcium chloride, magnesium chloride, sodium chloride, calcium sulfate, magnesium sulfate and the like;
(2) and a coacervation method: the coagulation method is to add flocculant into waste water and to combine oil droplets into polymer by means of the bridging effect of the flocculant. The flocculating agent is commonly used such as alum, polyaluminium chloride, activated silicic acid, polyacrylamide, ferrous sulfate, ferric chloride, magnesium alumina and the like. Studies have shown that alum treatment of the solubilised oil is effective when pH = 8.0-9.0, whereas ferrous sulfate can be used when pH = 8-10;
(3) and an acidification method: the acidification method is to add sulfuric acid, hydrochloric acid, acetic acid or naphthenic acid into the wastewater to destroy the boundary film of the emulsion oil droplets, so that the fatty acid soap is changed into fatty acid and separated out. The method reduces the pH value of the waste rate water, so the pH value needs to be adjusted by an alkaline agent after oil-water separation to reach the discharge standard;
(4) salting-out- -coacervation mixing method: salting-out-coagulation mixing method is to add salt electrolyte into waste water to demulsify the emulsion and then add coagulant to separate oil particles.
3. Centrifugation method
The centrifugal machine has two types, namely horizontal type and vertical type, and under the action of centrifugal force, a water phase is discharged from the outer layer of the centrifugal machine, and an oil phase is discharged from the middle part of the centrifugal machine. The structure of the centrifuge is relatively complex, so the method is not generally adopted in China.
Second, separation treatment after demulsification and oil removal
After the emulsion is demulsified and deoiled, the emulsion generally needs further treatment, and the treatment method and treatment equipment are also various, and can be summarized as follows:
1. gravity separation method
The gravity separation method is a method for separating by using the density difference of oil and water, and can be used for removing more than 60 oil particles and most of solid particles in wastewater. The most common apparatus for gravity separation is the oil interceptor. It utilizes the characteristic that oil is lighter than water to separate oil from water surface and skimming. The oil separation tank is mainly used for removing floating oil or emulsified oil after demulsification, has a plurality of forms, and mainly comprises a horizontal flow type oil separation tank (API), a parallel plate type oil separation tank (PPI), a corrugated inclined plate oil separation tank (CPI), a pressure difference automatic oil skimming device and the like; the method is suitable for floating oil and dispersed oil, and has stable effect, low operation cost and large equipment floor area.
2. Air float method
The air flotation method is a method in which a large number of fine bubbles are adsorbed on particles (oil droplets) to be removed, and pollutants are taken out of the water surface by the buoyancy of the gas, thereby achieving the purpose of separation. The air microbubbles are composed of nonpolar molecules, can be combined with hydrophobic oil to bring oil droplets to rise together, the floating speed can be improved by about thousand times, so that the oil-water separation efficiency is high, and the air floatation method can be classified into air-blowing air floatation, pressurized air floatation, electrolytic air floatation and the like according to different bubble generation modes. The air-blowing air floatation is to inject air into water by using an air blower, an air compressor and the like, and can also bring air into water by using a water pump water suction pipe and a water ejector. The electrolytic air floatation is to electrolyze water by an electrolytic cell, and to take pollutants out of the water surface by utilizing the tiny hydrogen and oxygen bubbles formed by electrolysis, the pressurized air floatation is to dissolve air in water under the pressurized condition, then to return to the normal pressure, and to separate the pollutants by utilizing a large amount of released micro bubbles. Among the air float processes, the pressurized air float process is mainly used at present. The method has the advantages of low power consumption, simple equipment and good effect, and is widely applied to the mature treatment process of oil field wastewater, petrochemical wastewater, food oil production wastewater and the like.
3. Adsorption process
The adsorption method is to adsorb oil in water by using an oleophilic material. The most commonly used adsorbing material is activated carbon, which has good oil absorption performance and can adsorb dispersed oil, emulsified oil and dissolved oil in wastewater, but the adsorbing capacity is limited (the oil is generally 30-80 mg/g), the activated carbon is expensive, and the regeneration is difficult, so the activated carbon is generally only used for treating low-concentration oily wastewater or deeply treating the low-concentration oily wastewater. Many studies on oil absorbents have been reported. The adsorption resin is a novel organic adsorption material developed in recent years, has good adsorption performance, is easy to regenerate and reuse, and can possibly replace activated carbon. In addition, coal, oil-absorbing felt, ceramsite, quartz sand, wood chips, straw and the like also have oil-absorbing performance and can be used as an adsorbing material. After the absorbing material absorbs oil and is saturated, some absorbing materials can be regenerated and reused, and some absorbing materials can be directly used as fuel.
4. Coarse grain method
The coarse granulation method (also called agglomeration method) is to make the oily waste water pass through a device filled with coarse granulation material to make the fine oil droplets in the waste water coalesce into large particles, so as to achieve the purpose of oil-water separation. The method is suitable for pretreatment of dispersed oil and emulsified oil. The technical key point is that the coarse grained material can be divided into fibrous and granular materials from the shape of the material; from the material properties, many researchers believe that the oleophilic and hydrophobic properties of the material surface are dominant. Furthermore, the contact angle of the oleophilic material with oil is preferably less than 70. When the oily wastewater passes through the material, fine oil particles are adsorbed on the surface of the material, oil droplets are gradually agglomerated and expanded to form an oil film through continuous collision, and finally the oil droplets are separated from the surface of the material and float on the water surface under the thrust of gravity and water flow, and the coarse grained materials can be further divided into inorganic materials and organic materials: the shape of the material can be made into granular, fibrous, tubular or cemented shapes, and polypropylene, anthracite, ceramsite, quartz sand and the like can be used as coarse grained fillers. The coarse graining oil removing device has the advantages of small volume, high efficiency, simple structure, no need of adding medicine, investment saving and the like. The disadvantage is that the packing is easily clogged, thus reducing the oil removal efficiency.
5. Electromagnetic adsorption method
The magnetic particles are mixed with the oily wastewater, oil droplets are adsorbed by the magnetic particles, then the oily magnetic particles are separated by a magnetic separation device, the sewage can be purified, and the oily magnetic particles are further treated, namely an electromagnetic adsorption method, which is rarely applied.
The traditional separation method has poor separation effect on emulsified oil, low standard reaching rate of the device, large amount of sludge generated by adding a medicament, and further increased salt content in sewage, has the defects of long process flow, large investment, medicament addition, poor adaptability to water quality fluctuation and the like, and has no related solution; there is therefore a pressing need to find effective solutions to the above problems.
Disclosure of Invention
The invention aims to provide an electro-desalting wastewater oil removal treatment system and process aiming at overcoming the defects in the prior art, and aims to overcome the defects of poor treatment effect, large occupied area, high medicament consumption, high sludge production, poor oil removal effect and the like in the conventional electro-desalting wastewater treatment process.
The invention provides an oil removal treatment system for electric desalting wastewater, which comprises an oil separation sedimentation tank and a membrane filtering device, wherein the oil separation sedimentation tank is connected with the membrane filtering device; the oil separation sedimentation tank is communicated with the membrane filtering device through a connecting pipe, a water supply pump is arranged on the connecting pipe, the water supply pump is used for sending the electric desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank into the membrane filtering device, and the membrane filtering device is used for filtering the precipitated electric desalting wastewater; the bottom of the oil-separating sedimentation tank is provided with a sedimentation tank.
Furthermore, the treatment system also comprises a sludge treatment device, and the sedimentation tank has a conical structure; the sedimentation tank is communicated with the sludge treatment device and is used for sending the precipitated sludge into the sludge treatment device, and the sludge treatment device is used for dehydrating the sludge.
Further, the processing system also comprises an oil recovery device, and the oil recovery device is communicated with the upper end in the oil separation sedimentation tank through an oil recovery pipe.
Furthermore, a separation membrane is arranged in the membrane filtration device, and the filtration precision of the separation membrane is less than 50 nm.
Furthermore, the treatment system also comprises a water inlet pipe and a circulating pipe, wherein the water inlet pipe is communicated with the inside of the oil separation sedimentation tank through the upper end of the side wall of the oil separation sedimentation tank, one end of the circulating pipe is communicated with the water inlet pipe, and the other end of the circulating pipe is communicated with a concentration discharge port in the membrane filtering device.
Further, the membrane filtration device is also communicated with a biochemical system or a post-treatment device; the oil content of the electric desalting wastewater filtered by the membrane filtering device is less than 10 ppm.
Correspondingly, the invention also provides an electro-desalting wastewater oil removal treatment process which can be applied to the electro-desalting wastewater oil removal treatment system; the method also comprises the following steps:
s1: firstly, introducing the electro-desalting wastewater into an oil separation sedimentation tank through a water inlet pipe for sedimentation, so that oil gathered in the electro-desalting wastewater floats upwards, and sludge in the electro-desalting wastewater is sedimentated by gravity;
s2: starting a water supply pump, and sending the electro-desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank into a membrane filtering device through a connecting pipe for filtering;
s3: the electric desalting wastewater filtered by the membrane filtering device enters a biochemical system or a post-treatment device, and concentrated water in the membrane filtering device returns to the oil separation sedimentation tank through a circulating pipe to be re-precipitated.
Further, the treatment process also comprises the following steps:
s4: the sludge treatment device is communicated with a sedimentation tank at the bottom of the oil-separating sedimentation tank, so that sludge in the sedimentation tank is collected;
s5: the oil recovery device is communicated with the upper end in the oil separation sedimentation tank through an oil recovery pipe, so that the floating oil is collected.
Furthermore, a separation membrane is arranged in the membrane filtering device and is used for filtering oil, suspended matters, bacteria and organic matters in the electric desalting wastewater.
Further, in the step S2, the oil content of the electric desalting wastewater filtered by the membrane filtering device is less than 10ppm, and then the electric desalting wastewater enters a biochemical system or a post-treatment device.
By adopting the technical scheme, the invention has the following beneficial effects:
the oil removal treatment system for the electro-desalting wastewater provided by the invention has the advantages of short whole treatment process, small occupied area and low system cost.
The electro-desalting wastewater oil removal treatment system and process provided by the invention have the advantages that impurities such as oil removal, suspended matters and the like are effectively filtered through a separation membrane through physical filtration.
Thirdly, the oil removal treatment system and the process for the electro-desalting wastewater provided by the invention can remove impurities such as oil, suspended matters and the like in the electro-desalting wastewater of a refinery at one time, and do not need to add chemicals during operation and increase the sludge amount; the membrane filtration process adopts circulating filtration to reduce the pollution of the membrane.
According to the system and the process for removing the oil from the electro-desalting wastewater, provided by the invention, the membrane concentrated solution returns to the oil separation tank for precipitation, so that sewage is not discharged during operation, and the pollution is reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention will be further explained with reference to the drawings, in which:
FIG. 1 is a schematic diagram of an oil removal treatment system for electric desalted wastewater according to the present invention;
FIG. 2 is a flow chart of the oil removing treatment process of the electro-desalting wastewater of the invention.
In the figure: 1. an oil-separating sedimentation tank; 11. a settling tank; 2. a water supply pump; 3. a membrane filtration device; 4. a connecting pipe; 5. a circulation pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 2, the present invention provides an oil removing treatment system for electric desalting wastewater, which is a treatment system for solving the problems of unsatisfactory treatment effect, large floor area, large medicament consumption, large sludge production, poor oil removing effect, etc. of the existing electric desalting wastewater treatment process of a refinery; the treatment system has small volume, is easy to skid-mount, and is suitable for the oil removal treatment of crude oil electric desalting sewage of refining enterprises; the system specifically comprises an oil separation sedimentation tank 1 and a membrane filtering device 3; the oil separation sedimentation tank 1 is communicated with the membrane filtering device 3 through a connecting pipe 4, a water supply pump 2 is arranged on the connecting pipe 4, the water supply pump 2 is used for sending the electric desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank 1 into the membrane filtering device 3 for physical filtration, namely the membrane filtering device 3 is used for filtering the electric desalting wastewater after the precipitation, so that oil, suspended matters, colloids, macromolecular organic matters and the like in the electric desalting wastewater are removed; furthermore, a plurality of sedimentation tanks 11 are arranged at the bottom of the oil-separating sedimentation tank 1, and the sedimentation tanks 11 are used for collecting the precipitated sludge, so that the further treatment is facilitated; in the scheme, the refinery electro-desalting wastewater subjected to oil skimming and precipitation is sent to a membrane filtering device 3 by a water supply pump 2 for separation, a special separation membrane is filled in the membrane filtering device 3, the separation membrane has the characteristics of clear water, oil resistance, high temperature resistance, acid and alkali resistance and the like, the filtering precision is less than 50nm, and oil, suspended matters, bacteria and macromolecular organic matters in the refinery electro-desalting wastewater are removed after being filtered by the membrane filtering device; the scheme provided by the invention provides the oil removal treatment process for the electric desalting sewage of the refinery aiming at the defects of unsatisfactory treatment effect, large floor area, high medicament consumption, high sludge production, poor oil removal effect and the like of the existing treatment process, and has the advantages of short treatment process, stable effect, low medicament consumption, containerization, high automation degree and the like.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, the treatment system further comprises a sludge treatment device, the sedimentation tank 11 has a conical structure, and the conical structure has an effect of conveniently collecting sludge; further, the settling tank 11 is communicated with a sludge treatment device for sending the settled sludge into the sludge treatment device, and the sludge treatment device is used for dewatering the sludge so as to recover the sludge.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, the treatment system further comprises an oil recovery device which is communicated with the upper end in the oil separation sedimentation tank 1 through an oil recovery pipe so as to recover the oil floating in the oil separation sedimentation tank 1.
Preferably, in combination with the above scheme, in this embodiment, a separation membrane is disposed in the membrane filtration device 3, and the filtration precision of the separation membrane is less than 50nm, so that the separation membrane can effectively filter oil, suspended matters, bacteria and macromolecular organic matters in the electric desalting wastewater; specifically, the separation membrane is made of an organic material, and compared with the traditional organic membrane material, the hydrophilic performance of the separation membrane is greatly improved; further, the contact angle of the separation membrane was 31.6 °, and the contact angle of PVDF, which is a conventional membrane material, was 59.5 ° (the smaller the contact angle, the more hydrophilic); furthermore, the separation membrane material is uncharged, is more resistant to oil and organic matter swelling compared with the existing membrane material, can operate at the temperature of 90 ℃, is resistant to acid and alkali environments, and has the pH tolerance range of 1-13.5; further, the width of the membrane flow channel in the membrane filtration device 3 is at most 3mm, and the membrane flow channel is corrugated, so that more pollutants can pass through the membrane filtration device without blockage.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, the treatment system further comprises a water inlet pipe and a circulating pipe 5, the water inlet pipe is communicated with the oil separation sedimentation tank 1 through the upper end of the side wall of the oil separation sedimentation tank 1, one end of the circulating pipe 5 is communicated with the water inlet pipe, and the other end of the circulating pipe 5 is communicated with a concentration discharge port in the membrane filtering device 3, so that the concentrated water in the membrane filtering device 3 can be circulated to the oil separation sedimentation tank 1 for secondary sedimentation and filtration treatment.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, the membrane filtration device 3 is also communicated with a biochemical system or a post-treatment device, so as to further treat the wastewater after filtration and separation; the oil content of the electric desalting wastewater filtered by the membrane filtering device 3 is less than 10ppm, so that the filtering and separating standard is met; the wastewater precipitated and pumped by the oil separation sedimentation tank 1 is sent to a membrane filtering device 3 by a water supply pump 2 for separation, a special separation membrane is filled in the membrane filtering device 3, and the wastewater is clean water, oil resistance, high temperature resistance, acid and alkali resistance, the filtering precision is less than 50nm, and oil, suspended matters, bacteria and macromolecular organic matters in the return fluid are removed after the electric desalting wastewater of the refinery is filtered by the membrane device.
Correspondingly, in combination with the above solution, as shown in fig. 1 to fig. 2, an electro-desalting wastewater degreasing treatment process can be applied to the electro-desalting wastewater degreasing treatment system; the oil removal treatment process for the electro-desalting sewage of the refinery realizes effective separation and removal of oil and suspended matters in the electro-desalting sewage in the shortest flow, and is suitable for water quality fluctuation, no dosage during operation and no sludge increase; specifically, the treatment process comprises the following steps:
s1: firstly, introducing the electro-desalting wastewater into an oil separation sedimentation tank 1 through a water inlet pipe for sedimentation, floating the gathered oil by utilizing the specific gravity difference, and settling suspended matters by gravity; namely, the oil gathered in the electric desalting wastewater floats upwards, and the sludge of the electric desalting wastewater is precipitated by gravity;
s2: starting the water supply pump 2, and sending the electro-desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank 1 into the membrane filtering device 3 through the connecting pipe 4 for filtering; specifically, the refinery electro-desalted sewage after oil skimming and precipitation is sent into a membrane filtering device 3 by a water supply pump 2 for separation, a special separation membrane is filled in the membrane filtering device, the separation membrane has the characteristics of clear water, oil resistance, high temperature resistance and acid and alkali resistance, the filtering precision of the separation membrane is less than 50nm, and oil, suspended matters, bacteria and macromolecular organic matters in the wastewater are removed after the refinery electro-desalted sewage is filtered by the membrane device;
s3: the electric desalting wastewater filtered by the membrane filtering device 3 enters a biochemical system or a post-treatment device for further treatment; specifically, the concentrated water in the membrane filtration device 3 is returned to the oil separation sedimentation tank 1 through the circulation pipe 5 for re-sedimentation, so that the concentrated water in the membrane filtration device 3 can be circulated to the oil separation sedimentation tank 1 for secondary sedimentation and filtration treatment.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, the treatment process further includes the following processes:
s4: the sludge treatment device is communicated with the sedimentation tank 11 at the bottom of the oil separation sedimentation tank 1 so as to collect the sludge in the sedimentation tank 11, and the sedimentation tank 11 is of a conical structure which has the function of conveniently collecting the sludge;
s5: the oil recovery device is communicated with the upper end in the oil separation sedimentation tank 1 through an oil recovery pipe, so that the floating oil is collected for further treatment.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, a separation membrane is arranged in the membrane filtration device 3, and the separation membrane is used for filtering oil, suspended matters, bacteria and organic matters in the electric desalting wastewater.
Preferably, in combination with the above scheme, as shown in fig. 1 to 2, in the step S2, the oil content of the electric desalting wastewater filtered by the membrane filtration device 3 is less than 10ppm, and then the electric desalting wastewater enters a biochemical system or a post-treatment device.
By adopting the technical scheme, the invention has the following beneficial effects:
the oil removal treatment system for the electro-desalting wastewater provided by the invention has the advantages of short whole treatment process, small occupied area and low system cost.
The electro-desalting wastewater oil removal treatment system and process provided by the invention have the advantages that impurities such as oil removal, suspended matters and the like are effectively filtered through a separation membrane through physical filtration.
Thirdly, the oil removal treatment system and the process for the electro-desalting wastewater provided by the invention can remove impurities such as oil, suspended matters and the like in the electro-desalting wastewater of a refinery at one time, and do not need to add chemicals during operation and increase the sludge amount; the membrane filtration process adopts circulating filtration to reduce the pollution of the membrane.
According to the system and the process for removing the oil from the electro-desalting wastewater, provided by the invention, the membrane concentrated solution returns to the oil separation tank for precipitation, so that sewage is not discharged during operation, and the pollution is reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (10)
1. An electro-desalting wastewater oil removal treatment system is characterized by comprising an oil separation sedimentation tank (1) and a membrane filtering device (3); the oil separation sedimentation tank (1) is communicated with the membrane filtering device (3) through a connecting pipe (4), a water supply pump (2) is arranged on the connecting pipe (4), the water supply pump (2) is used for sending the electric desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank (1) into the membrane filtering device (3), and the membrane filtering device (3) is used for filtering the precipitated electric desalting wastewater; and a settling tank (11) is arranged at the bottom of the oil separation settling tank (1).
2. The electro-desalting wastewater degreasing treatment system as set forth in claim 1, wherein the treatment system further comprises a sludge treatment device, the settling tank (11) is of a cone-shaped structure; the settling tank (11) is communicated with the sludge treatment device and is used for conveying settled sludge into the sludge treatment device, and the sludge treatment device is used for dewatering the sludge.
3. The electro-desalting wastewater degreasing treatment system as set forth in claim 1 or 2, wherein the treatment system further comprises an oil recovery device communicating with the upper end inside the oil-separating sedimentation tank (1) through an oil recovery pipe.
4. The electro-desalting wastewater degreasing treatment system as set forth in claim 1, wherein a separation membrane is disposed in the membrane filtration device (3), and the filtration precision of the separation membrane is less than 50 nm.
5. The oil removal treatment system for electric desalting wastewater according to claim 3, further comprising a water inlet pipe and a circulating pipe (5), wherein the water inlet pipe is communicated with the inside of the oil separation sedimentation tank (1) through the upper end of the side wall of the oil separation sedimentation tank (1), one end of the circulating pipe (5) is communicated with the water inlet pipe, and the other end of the circulating pipe (5) is communicated with a concentration discharge port in the membrane filtering device (3).
6. The electro-desalting wastewater degreasing treatment system as set forth in claim 1, wherein the membrane filtration device (3) is further communicated with a biochemical system or a post-treatment device; the oil content of the electric desalting wastewater filtered by the membrane filtering device (3) is less than 10 ppm.
7. An oil removing treatment process for electric desalting wastewater, which can be applied to the oil removing treatment system for electric desalting wastewater of any one of claims 1 to 6; the method is characterized by further comprising the following steps:
s1: firstly, introducing the electric desalting wastewater into an oil separation sedimentation tank (1) through a water inlet pipe for sedimentation, so that oil gathered in the electric desalting wastewater floats upwards, and sludge in the electric desalting wastewater is precipitated by gravity;
s2: starting the water supply pump (2), and sending the electro-desalting wastewater after the sludge is precipitated in the oil separation sedimentation tank (1) into the membrane filtering device (3) for filtering through the connecting pipe (4);
s3: the electric desalting wastewater filtered by the membrane filtering device (3) enters a biochemical system or a post-treatment device, and concentrated water in the membrane filtering device (3) returns to the oil separation sedimentation tank (1) through a circulating pipe (5) for re-sedimentation.
8. The oil removing treatment process for the electro-desalting wastewater as claimed in claim 7, further comprising the following steps:
s4: the sludge treatment device is communicated with a sedimentation tank (11) at the bottom of the oil separation sedimentation tank (1) so as to collect sludge in the sedimentation tank (11);
s5: the oil recovery device is communicated with the upper end in the oil separation sedimentation tank (1) through an oil recovery pipe, so that the floating oil is collected.
9. The oil removing treatment process for the electric desalting wastewater according to claim 7, wherein a separation membrane is arranged in the membrane filtering device (3), and the separation membrane is used for filtering oil, suspended matters, bacteria and organic matters in the electric desalting wastewater.
10. The oil removing treatment process of the electric desalting wastewater according to claim 7, wherein in the step S2, the oil content of the electric desalting wastewater filtered by the membrane filtering device (3) is less than 10ppm, and then the electric desalting wastewater enters a biochemical system or a post-treatment device.
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