CN115057576B - Operation method for advanced treatment and reuse of sewage in petrochemical industry and application thereof - Google Patents

Operation method for advanced treatment and reuse of sewage in petrochemical industry and application thereof Download PDF

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CN115057576B
CN115057576B CN202110935289.6A CN202110935289A CN115057576B CN 115057576 B CN115057576 B CN 115057576B CN 202110935289 A CN202110935289 A CN 202110935289A CN 115057576 B CN115057576 B CN 115057576B
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module
sewage
membrane
treatment
operation method
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CN115057576A (en
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赵学法
陶伟强
张珍君
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Jinan Huichengda Technology Co ltd
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Jinan Huichengda Technology Co ltd
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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
    • 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
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • 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
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to the field of oil refining sewage treatment, in particular to an operation method for advanced treatment and reuse of sewage in petrochemical industry and application thereof, wherein sewage is divided into oily sewage, sulfur-containing sewage, salt-containing sewage and other sewage according to different sewage outlet positions. The oil removal module comprises an API oil-water segmentation module and an air floatation module, wherein the desalting module comprises an EDI desalting module and a BPM membrane desalting module, flocculating agent aluminum sulfate is added into the air floatation module, and the centralized processing module comprises a microorganism supplementing system, an MBR (membrane bioreactor), an MABR control system, an RO (reverse osmosis) and UF (ultra-filtration) double-membrane system. The modularized treatment device is adopted, the device is concise and can move flexibly, each device can be increased or reduced according to actual needs, the module device can be flexibly transported to a production source for treating sewage, and the module device can be used as a standby treatment device for coping with the impact of abnormal conditions on enterprises when the sewage treatment device is abnormal, so that the economic burden on the enterprises is small.

Description

Operation method for advanced treatment and reuse of sewage in petrochemical industry and application thereof
Technical Field
The invention relates to the field of C02F9/14, in particular to an operation method for advanced treatment and reuse of sewage in petrochemical industry and application thereof.
Background
The water environment pollution and the water resource shortage are one of the environmental resource problems which are paid attention to worldwide nowadays, on one hand, the new water source is developed as much as possible, the water supply amount is increased, and on the other hand, the sewage treatment is enhanced, so that the pollution degree of the treated sewage to the environment is reduced, and the recycling target is achieved. The sewage recycling can not only effectively reduce the sewage discharge amount and reduce the pollution degree to the environment, but also enable the sewage to become a valuable water source and increase the water supply, thereby being an important development direction of the current sewage treatment. The water environment pollution is caused by a plurality of reasons, wherein the industrial sewage is one of important factors of water body pollution, the sewage discharged by petroleum enterprises is an important part of industrial water, and the oil refining sewage is sewage discharged by petroleum enterprises in the processes of oil refining, product processing and the like. The petrochemical oil refining sewage mainly comes from three aspects, namely sewage generated in the crude oil processing process, circulating cooling water in the production process, and sewage formed by rainwater falling to the ground in a converging way. The sewage produced in the crude oil processing process has the most serious pollution degree, the most complex treatment and the greatest harm to the environment, and the sewage produced in the crude oil processing process has the advantages of complex pollution components, serious pollution and difficult treatment although the sewage quantity accounts for a small proportion of the total sewage quantity of the whole petrochemical enterprises. The petrochemical refining sewage generated in the crude oil processing process often contains more hydrocarbon substances, benzene series substances, ethers, volatile powder, amines, mercaptan and other substances, which are difficult to biodegrade, are toxic and harmful in most cases, and are greatly harmful to aquatic organisms, soil, crop growth and human health, thus being one of important industrial pollution sources.
The sewage treatment process of petrochemical oil refining is generally divided into three stages from the sewage treatment degree. The primary treatment is generally used for removing suspended solids and other substances in the wastewater so as to ensure that the subsequent treatment is carried out smoothly, and the measures adopted in the primary treatment include methods of grating, precipitation, neutralization, oil separation and the like. The secondary treatment of oil refining waste water mainly includes degrading and removing organic pollutant to reach the requirement of emission standard, and the secondary treatment is commonly biological method including active sludge process, biological film process and other improved biological methods. The third-stage treatment (also called advanced treatment) mainly uses various methods such as physics, chemistry, biology and the like to decolorize and deodorize the sewage after the second-stage treatment, reduce trace elements, nutrient substances and the like in the water, and further improve the quality of the effluent so as to reduce the influence on the environment or make the produced water be used as reuse water. The advanced treatment mode which has low requirements on the original treatment effect of the petrochemical oil-refining sewage and has simple process and good removal effect on ammonia nitrogen and the like is found, and the advanced treatment mode is a key point of recycling sewage of the original 'old three sets' sewage treatment plants as the water replenishing of circulating cooling water. The advanced treatment process can enable the existing sewage treatment plant to be transformed into a recyclable sewage treatment system, greatly improve the recycling rate of sewage of petrochemical oil refining enterprises in China, and certainly generate good economic benefits.
The existing petroleum sewage treatment system has the problems of complex structure and higher manufacturing cost, and is difficult for small and medium enterprises to bear the cost, in addition, the problems of incomplete treatment of benzene series substances, ethers, volatile powder, amines, mercaptan and other substances, the residual chemical substances have great damage to soil crops, and the corrosion and the damage to the pipelines when the system is used as circulating water lead the enterprises to bear larger economic burden.
CN201911051803.9 discloses a treatment method for petrochemical mixed discharged sewage, which adopts a multi-section combined biological membrane denitrification mode to purify nitrogen and phosphorus in the sewage, however, the sewage of a petrochemical plant contains abundant impurities such as amines, salts and bacteria, and the treatment method cannot completely purify all at one time.
CN201810083607.9 discloses a petrochemical wastewater treatment system, which comprises a multistage reverse osmosis water treatment device, a multistage cooling crystallization device and a centrifugal device for purification, wherein the wastewater contains a large amount of heavy oil heavy salt impurities, and the direct filtration by a reverse osmosis membrane can cause the blockage of the membrane and the stagnation of the purification process.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides an operation method for advanced treatment and reuse of sewage in petrochemical industry, which is characterized in that: according to different sewage water outlet positions, sewage water is divided into oily sewage, sulfur-containing sewage, salt-containing sewage and other sewage, wherein the other sewage comprises factory polluted rainwater, domestic sewage and polluted condensed water.
The oily sewage enters the centralized treatment module after being treated by the oil removal module.
The oily sewage includes, but is not limited to, tank cut water, pump cooling water, test drain water, stripping drain water, initial rainwater in the device area, and domestic sewage.
As a preferred embodiment, the oil removal module includes an API oil-water segmentation module and a first air floatation module.
The API oil-water segmentation module is used for removing large insoluble oil stains in sewage, so that the insoluble oil stains are separated from the sewage.
The first air floatation module is used for removing tiny suspended matters with specific gravity close to that of water in sewage.
Preferably, a flocculating agent is added into the first air flotation module, and the flocculating agent is aluminum sulfate.
Preferably, the first air floatation module adopts an electrolytic method to manufacture bubbles, the voltage of the electrolytic method is 6-8v, and the diameter of the bubbles is 0.5-5cm.
In the API oil-water segmentation module, firstly, larger oil blocks floating on the surface are removed in a filtering mode, sewage subjected to primary filtering enters an air floatation module, the movement rate and the bubble size of generated bubbles are controlled in a mode of supplying direct current with the voltage of 6-8v into a first air floatation tank, and the applicant finds that the movement rate of the generated bubbles is moderate and the bubble size is uniform when the voltage is 6-8v, the diameter size is in a range of 0.5-5cm, oil drops in the sewage can be effectively brought to the sewage surface, and the oil drops are effectively connected into large-piece oil drops, so that flocculation is easy. However, when the voltage is too high, the bubbles burst during the rising process due to excessive expansion, and the internal oil droplets cannot move to the surface.
The flocculant is added in the first air flotation module, so that oil drops brought to the liquid level by bubbles are effectively precipitated through chemical reaction, the blocking of a permeable membrane and a filtering membrane in a subsequent double-membrane system can be prevented, the replacement frequency of the membrane is reduced, and the continuous working time of the system is prolonged. The oil content of the sewage treated by the oil removal module can be reduced to below 100mg/L through detection, and the oil removal effect is good.
Preferably, the degreasing module further comprises an MBR biochemical system.
Preferably, the MBR biochemical system is used for removing suspended matters, COD (chemical oxygen demand), ammonia nitrogen compounds and phosphorus compounds in sewage.
As a preferred embodiment, the centralized processing module includes a biological module and a double membrane module.
Preferably, the biological module comprises a primary biochemical module and a secondary biochemical module.
Preferably, the primary biochemical module comprises a microbial replenishment system.
The microorganism supplementing system degrades organic pollutants and inorganic pollutants in sewage through aerobic microorganisms and anaerobic microorganisms in the system.
Preferably, the microorganism in the microorganism supplementing system is denitrifying bacteria.
Preferably, the secondary biochemical module comprises an MBR and an MABR control system.
The MBR and MABR control system filters activated sludge in the sewage through the MBR and MABR membranes.
Preferably, the membrane in the MBR is made of polyester, and the pore diameter of the membrane is 0.1-0.3 mu m.
Preferably, the membrane in the MBR is made of polycarbonate
Preferably, the membrane in the MBR is made of fluoroethylene copolymer, and the pore diameter of the membrane is 0.05-0.2 mu m.
Preferably, the membrane in the MBR is made of polytetrafluoroethylene.
Preferably, the temperature of the secondary biochemical module is 45-55 ℃.
The applicant finds that the reaction rate of the MBR and MABR control system is greatly influenced by the temperature, when the reaction temperature is 45-55 ℃, the purification rate of the MBR and MABR control system can reach more than 90%, and when the temperature is too high or too low, the purification rate is reduced, which is probably because the MBR and MABR membranes are compact and thin in thickness, the purification effect is good, and when the temperature is 45-55 ℃, the activity of denitrifying bacteria enzyme is inhibited or deactivated, so that the purification efficiency is reduced.
Preferably, the double-membrane module comprises an RO, UF double-membrane system.
The RO and UF double-membrane system is used for removing dissolved salts, colloids, bacteria, viruses and bacterial endotoxin in sewage.
Preferably, the membrane in the RO has a water permeability of 8 to 14GFD (flow per unit surface, gallons per square foot per day).
Preferably, the molecular cut-off of the membrane in the UF is 30000 to 38000 daltons.
The applicant finds that the water permeability can be improved and the metal ion permeability can be reduced by limiting the water permeability of the membrane in RO, the entrapment rate of macromolecules such as proteins, pigments, polysaccharides and the like can be effectively improved by limiting the molecular interception rate of the UF membrane, the permeability of small molecular substances such as inorganic salts, ash and the like can be unexpectedly improved, the clogging rate of the UF membrane can be unexpectedly reduced, and the service life of the UF membrane can be prolonged. Through the connection and use of the RO and UF double-membrane systems, the integral purification efficiency of the sewage treatment system is improved.
The sulfur-containing sewage enters the centralized treatment module after being treated by the oil removal module.
The sulfur-containing wastewater includes, but is not limited to, atmospheric and vacuum distillation wastewater, catalytic cracking wastewater, hydrocracking wastewater, delayed coking wastewater, and hydrofinishing wastewater.
As a preferred embodiment, the oil removal module includes an API oil-water segmentation module and a second air floatation module.
Preferably, a flocculating agent is added into the second air flotation module, and the flocculating agent is aluminum sulfate.
As a preferred embodiment, the centralized processing module includes a biological module and a double membrane module.
Preferably, the biological module comprises a primary biochemical module and a secondary biochemical module.
Preferably, the primary biochemical module comprises a microbial replenishment system.
Preferably, the secondary biochemical module comprises an MBR and an MABR control system.
Preferably, the double-membrane module comprises an RO, UF double-membrane system.
The salt-containing sewage enters a centralized treatment module after being treated by a desalting module.
The salty sewage water comprises, but is not limited to, electric desalted water, alkaline sewage water of a product refining device, sewage water discharged from a circulating water field, drainage water from a commercial warehouse and regenerated flue gas desulfurization wastewater from a catalytic device.
As a preferred embodiment, the desalination module comprises a third air flotation module, an AO biochemical module, an ozonolysis module, an EDI desalination module, a BPM membrane desalination module.
Preferably, the third air floatation module is used for removing tiny suspended matters with specific gravity close to that of water in the sewage.
Preferably, a flocculating agent is added into the third air flotation module, wherein the flocculating agent is aluminum chloride and ferric chloride according to the mass ratio (1-5): 1.
Preferably, the third air floatation module is dissolved air floatation, and air is sent into the third air floatation module through an air compressor to manufacture bubbles.
Preferably, the AO biochemical module is used for decomposing organic pollutants in sewage and assisting denitrification and dephosphorization.
Preferably, the AO biochemical module comprises a grid well, an adjusting tank lifting water pump, a sedimentation tank, an anoxic tank, a biological contact oxidation tank, a disinfection tank and a silt tank.
Preferably, the ozonolysis module is used for degrading organic pollutants which are difficult to degrade and toxic.
Preferably, the EDI desalting module is selected from 201X7MB of strong-base anion exchange resin and 001X7MB of strong-acid cation exchange resin, which are purchased from the company of the division of the resin technology, the company of the division of the resin technology.
The EDI is a continuous electric desalting technology, integrates an electrodialysis technology and an ion exchange technology, adds anion-cation exchange resin into a fresh water chamber in the electrodialysis technology, realizes directional migration of ions in water under the action of an electric field by the selective permeation effect of the anion-cation exchange resin on anions and cations, thereby achieving deep purification and desalting of the water, and continuously regenerates the filling resin by hydrogen ions and hydroxide ions generated by water electrolysis.
The invention solves the problem that the desalination rate of the traditional electrodialysis is only 45-60% by combining the electrodialysis technology and the ion exchange technology, and the sewage desalination rate of the EDI desalination module is 75-90% by detection.
The BPM membrane desalination module is used for decomposing water into hydrogen ions and hydroxyl ions and converting salts in the aqueous solution into corresponding acids and bases.
Preferably, the BPM film has a thickness of 150-250 μm.
Preferably, the desalination module further comprises a BAF biochemical system.
Preferably, the BAF biochemical system is used for removing suspended matters, COD (chemical oxygen demand), ammonia nitrogen compounds and phosphorus compounds in sewage.
As a preferred embodiment, the centralized processing module includes a biological module and a double membrane module.
Preferably, the biological module comprises a primary biochemical module and a secondary biochemical module.
Preferably, the primary biochemical module comprises a microbial replenishment system.
Preferably, the secondary biochemical module comprises an MBR and an MABR control system.
Preferably, the double-membrane module comprises an RO, UF double-membrane system.
The other sewage directly enters the centralized treatment module.
As a preferred embodiment, the centralized processing module includes a biological module and a double membrane module.
Preferably, the biological module comprises a primary biochemical module and a secondary biochemical module.
Preferably, the primary biochemical module comprises a microbial replenishment system.
Preferably, the secondary biochemical module comprises an MBR and an MABR control system.
Preferably, the double-membrane module comprises an RO, UF double-membrane system.
The second aspect of the invention provides an application of a method for advanced treatment, reuse and operation of sewage in petrochemical industry, which is characterized in that: the method is applied to refinery sewage treatment.
The API is an acronym for the american petroleum institute, which has made corresponding quality specifications for the petroleum, petrochemical, and natural gas industries.
The MBR is a Membrane bioreactor (Membrane Bio-Reactor), and is a novel water treatment technology combining a Membrane separation unit and a biological treatment unit.
The MABR is a membrane aeration biomembrane reactor (Membrane Aerated Biofilm Reactor) and is a technology combining biomembrane method and aeration.
The AO is an anaerobic-aerobic process method and is used for removing organic matters in water.
The RO is a reverse osmosis membrane, the aperture is 0.0001 micron, only water molecules and partial mineral ions can pass through, and other impurities and heavy metals are discharged from a waste pipe.
The UF is an ultrafiltration membrane with the molecular weight cut-off range of 1000-200000 daltons, and the ultrafiltration membrane can cut-off macromolecular impurities (such as protein, pigment, polysaccharide and the like) from penetrating through a target product; can intercept target products, and can separate target products with different molecular weights through small molecular impurities (inorganic salts, small molecular pigments, monosaccharides, ash and the like) and water.
The BPM is a bipolar membrane, and is usually a composite ion exchange membrane formed by compositing an anion exchange layer and a cation exchange layer.
Compared with the prior art, the invention has the following beneficial effects:
1. the method for operating the advanced treatment and recycling of the petrochemical wastewater has the advantages that the removal rate of the wastewater impurities and the chemical reagents treated by the method is high, the standard of the recycled water can be achieved, the water quality is stable, and the phenomenon of poor water quality such as precipitation and layering can not occur.
2. The operation method for advanced treatment and reuse of the petrochemical wastewater adopts the modularized treatment device, the device is concise and flexible to move, the scale of each module device can be changed according to actual needs, the module device can be flexibly transported to a production source for treating the wastewater, and the module device can be used as a standby treatment device for coping with the impact of abnormal conditions on enterprises when the wastewater treatment device is abnormal, so that the economic burden of the enterprises is reduced.
3. The method solves the problems of unstable bubble size and moving speed, low oil removal efficiency and prolonged service life of a subsequent double-membrane system by adding a specific flocculant by limiting the voltage and the bubble diameter in the API oil-water segmentation module.
4. The invention solves the problem of low desalination rate in the electrodialysis method in the prior art by selecting specific anion-cation exchange resin and combining the electrodialysis method, and greatly improves the desalination rate of the desalination module by combining the BPM membrane with specific thickness.
5. The invention solves the problem that the purification efficiency cannot be further improved due to neglecting the reaction temperature in the prior art by limiting the temperature of the MBR and MABR control system, further protects the MBR and MABR membranes and prolongs the service life.
6. The invention has the advantages of good water quality, small occupied area, difficult odor generation, strong impact load resistance and difficult sludge blocking by arranging the MBR biochemical system.
7. According to the invention, the third air floatation module, the AO biochemical module and the ozone decomposition module are arranged in the desalination module, so that the problems of incomplete desalination effect, poor effluent quality and difficult degradation of organic pollutants in the prior art can be solved.
Detailed Description
The present invention will be specifically described below by way of examples. It is noted herein that the following examples are given solely for the purpose of further illustration and are not to be construed as limitations on the scope of the invention, as will be apparent to those skilled in the art in light of the foregoing disclosure.
Polycarbonate CAS no: 9002-84-0
Polytetrafluoroethylene CAS no: 25037-45-0
In addition, the raw materials used are commercially available unless otherwise indicated.
Examples
The first aspect of the embodiment provides an operation method for advanced treatment and reuse of sewage in petrochemical industry, which divides sewage into oily sewage, sulfur-containing sewage, salt-containing sewage and other sewage according to different sewage outlet positions.
The oily sewage is treated by the API oil-water segmentation module, the first air floatation module and the MBR biochemical system and then sequentially enters the microorganism supplementing system, the MBR, the MABR control system and the RO and UF double-membrane system.
The sulfur-containing sewage is treated by the API oil-water segmentation module and the second air floatation module and then sequentially enters a microorganism supplementing system, an MBR, an MABR control system and an RO and UF double-membrane system.
The salt-containing sewage is treated by a third air floatation module, an AO biochemical module, an ozone decomposition module, an EDI desalination module and a BPM membrane desalination module and then sequentially enters a microorganism supplementing system, an MBR, an MABR control system and an RO and UF double-membrane system; adding a flocculating agent into the third air flotation module, wherein the flocculating agent is aluminum chloride and ferric chloride according to the mass ratio of 2: 1.
Other sewage directly and sequentially enters a microorganism supplementing system, an MBR, an MABR control system, an RO and UF double-membrane system.
The air flotation modules all adopt an electrolytic method to manufacture bubbles, the voltage is 7v, and the diameter of each bubble is 3+/-1 cm.
The EDI desalting modules are respectively selected from 201X7MB of strong-base anion exchange resin and 001X7MB of strong-acid cation exchange resin, which are purchased from Tianjin Adon resin technology Co.
The thickness of the film in the above BPM was 200. Mu.m.
The membrane in the MBR is made of polycarbonate, and the pore diameter is 0.2 mu m.
The membrane in the MBR is made of polytetrafluoroethylene, and the pore diameter is 0.1 mu m.
The temperature of the two-stage biochemical modules is 50 ℃.
The water permeability of the membranes in RO is 10GFD, and the molecular cut-off of the membranes in UF is 35000 daltons.
15g/L aluminum sulfate is added into the air flotation module, the MBR, the MABR control system, the RO and UF double-membrane system as a flocculating agent and stirred for 120 minutes.
Each module is provided with detection equipment for pH, conductivity, oxygen content, gas and liquid flow, and transmits signals to a monitoring system in real time so as to ensure the normal operation of the system.
A second aspect of the present embodiment provides an application of a method for advanced treatment and reuse operation of petrochemical wastewater, which is applied to treatment of refinery wastewater.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to equivalent embodiments without departing from the technical content of the present invention, and any simple modification, equivalent changes and alterations to the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims (4)

1. An operation method for advanced treatment and reuse of sewage in petrochemical industry is characterized in that: according to different sewage outlet positions, separating sewage into oily sewage, sulfur-containing sewage, salt-containing sewage and other sewage;
the oily sewage enters a centralized treatment module after being treated by an oil removal module;
the sulfur-containing sewage enters a centralized treatment module after being treated by an oil removal module;
the salt-containing sewage enters a centralized treatment module after being treated by a desalting module;
the other sewage directly enters a centralized treatment module;
the other sewage comprises factory polluted rainwater, domestic sewage and polluted condensed water;
the oil removal module comprises an API oil-water segmentation module, a first air floatation module and an MBR biochemical system; the first air flotation module adopts an electrolytic method to manufacture bubbles, the voltage of the electrolytic method is 6-8v, and the diameter of the bubbles is 0.5-5cm;
the desalination module comprises a third air flotation module, an AO biochemical module, an ozone decomposition module, an EDI desalination module and a BPM membrane desalination module, wherein the thickness of the BPM membrane is 150-250 mu m;
the centralized processing module comprises a biological module and a double-membrane module;
the biological module comprises a primary biochemical module and a secondary biochemical module;
the primary biochemical module comprises a microorganism supplementing system, and the secondary biochemical module comprises an MBR (membrane bioreactor) and an MABR control system;
the membrane in the MBR is made of polyester, and the pore diameter of the membrane is 0.1-0.3 mu m; the temperature of the secondary biochemical module is 45-55 ℃.
2. The operation method for advanced treatment and recycling of sewage in petrochemical industry according to claim 1, wherein the operation method comprises the following steps: and adding a flocculating agent into the first air flotation module.
3. The operation method for advanced treatment and recycling of sewage in petrochemical industry according to claim 2, wherein the operation method comprises the following steps: the double-membrane module comprises an RO and UF double-membrane system; the water permeability of the membrane in the RO is 8-14GFD; the membrane in the UF has a cutoff molecular weight of 30000-38000 daltons.
4. An application of the operation method for advanced treatment and recycling of petrochemical wastewater according to claim 1, which is characterized in that: the operation method is applied to the treatment of refinery sewage.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597119A (en) * 2008-06-03 2009-12-09 新疆德蓝科技有限公司 Integrating technology of water supplying and saving and sewage reusing technology system in petroleum and petrochemical industry
CN102452750A (en) * 2010-10-15 2012-05-16 中国石油化工股份有限公司 Method for oil refinery sewage classification control and grading treatment
CN110845070A (en) * 2018-08-21 2020-02-28 中国石油天然气股份有限公司 Sewage treatment system
WO2021009537A1 (en) * 2019-07-14 2021-01-21 Majid Ahmadi Modern process for spent caustic treating and converting wastewater into valuable by products with process simulation by aspen plus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597119A (en) * 2008-06-03 2009-12-09 新疆德蓝科技有限公司 Integrating technology of water supplying and saving and sewage reusing technology system in petroleum and petrochemical industry
CN102452750A (en) * 2010-10-15 2012-05-16 中国石油化工股份有限公司 Method for oil refinery sewage classification control and grading treatment
CN110845070A (en) * 2018-08-21 2020-02-28 中国石油天然气股份有限公司 Sewage treatment system
WO2021009537A1 (en) * 2019-07-14 2021-01-21 Majid Ahmadi Modern process for spent caustic treating and converting wastewater into valuable by products with process simulation by aspen plus

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