599 results about "Oily wastewater" patented technology

The invention relates to the technical field of sewage treatment, and discloses an advanced treatment method and device for ship oily wastewater, and the method comprises the following steps: carrying out preliminary filtration on the ship oily wastewater to remove suspended solids and particulate matters so as to obtain first oily wastewater; the first oily wastewater is subjected to coalescence separation treatment, floating oil, dispersed oil and a small part of emulsified oil in the wastewater are removed, the oil content in the wastewater is reduced to 500 ppm or below, and second oily wastewater is obtained; the second oily wastewater is subjected to cross-flow ultrafiltration deep treatment, emulsified oil and dissolved oil are intercepted, produced water and concentrated water are obtained, and the concentrated water serves as third oily wastewater; the third oil-containing wastewater flows back to the first oil-containing wastewater, and discharged water is obtained after the produced water is detected to be qualified. The invention provides a primary filtration, coalescence separation and ultrafiltration three-stage circulating filtration method, emulsified oil and dissolved oil can be efficiently separated and removed, oil resource recovery is realized, and membrane pollution is reduced.

The invention provides a coalescence-selective filtration-deep bed filtration efficient oil-water separation system which comprises a coalescence system, a selective filtration system and a deep bed filtration system, oily wastewater enters a coalescer, and tiny oil droplets are coalesced into larger oil droplets through wetting coalescence and collision coalescence; the coalesced wastewater enters a selective filter, oil droplets and water respectively flow out through an oil channel and a water channel, and primary separation is realized; according to the present invention, the water after the primary separation enters the deep bed filter to achieve the deep separation, the efficient oil-water separation and the water quality standard discharge or reuse are achieved through the combination process of coalescence, selective filtration and deep bed filtration, and the system has advantages of high treatment efficiency, low energy consumption, less carbon emission, oil and water recycling, or water standard discharge.

The invention provides an oily water treatment equipment control method based on the Internet of Things, which comprises the following steps: feeding back data through an operation state, calling a multi-dimensional data analysis module, carrying out association calculation on energy consumption, treatment efficiency and adjustment parameters, predicting a subsequent operation trend by adopting a support vector machine algorithm, and obtaining a feasibility evaluation result of energy-saving mode switching; if the feasibility evaluation result of the energy-saving mode switching shows that the energy consumption optimization space is relatively large, starting an energy-saving mode switching module, reducing the power output of a non-key processing unit, maintaining the core separation efficiency, and determining new energy consumption balance point data; and through equipment state updating information, continuously monitoring an operation cost control module, comparing cleaned energy consumption data with historical records, calculating a cost saving range, and judging a potential improvement space for prolonging the service life of the equipment.

The invention discloses a composite polyacrylamide flocculant based on a nano core-shell structure as well as a preparation method and application of the composite polyacrylamide flocculant. The composite polyacrylamide flocculant is a core-shell structure composite material which takes inorganic nanoparticles grafted with carbon-carbon double bonds on the surface as a core and takes a polyacrylamide copolymer as a shell; the polyacrylamide copolymer is prepared from the following components in parts by mass: 70 to 90 parts of acrylamide, 10 to 30 parts of functional monomer and 0.1 to 1.0 part of cross-linking agent. The basic conception of the flocculating agent provided by the invention is that the structural design of inorganic nano core-organic polymer shell is adopted, PAM molecular chains firmly grow on the surfaces of nano particles in a chemical grafting manner, high dispersion and functional synergy of nano units are realized, and the obtained product has the characteristics of high flocculation speed, dense floc, high removal efficiency and the like, and has a wide application prospect. The method is especially suitable for deep treatment of difficult-to-treat industrial wastewater such as oil-containing wastewater, dye wastewater and heavy metal wastewater.

A separation membrane that is an ultrapure water membrane; a food and / or beverage processing membrane; a municipal water membrane; a peel oil recovery membrane; a (bio) refinery dewatering membrane; an oily wastewater (pre-) treatment membrane; a metal extraction membrane; a desalination membrane; and / or a protein fraction membrane. The membrane includes a porous substrate layer and an active layer arranged over at least a part of the substrate layer. The active layer includes a hydrophilic agent and a superhydrophilic agent. Also described is a method of producing the separation membrane.

The present invention provides a treatment system for oily wastewater in methanol to olefins products, the treatment system comprises an oil separator, a clarification tank, a filter, a coalescer and a clean water tank which are sequentially connected through pipelines, the oil separator is provided with a water inlet, and the clean water tank is provided with a water outlet; wherein, the inner cavity of the oil separator and the clarification tank is provided with a plurality of partitions arranged at intervals from each other, the partitions divide the inner cavity of the tank into a plurality of reaction chambers, the partitions are provided with connecting ports to connect the reaction chambers, an oil bag is provided in each cavity of the oil separator, and a dosing device is provided in the cavity of the clarification tank to add drugs thereto. In view of the characteristics of methanol to olefin oily wastewater, the present invention treats floating oil, solid attached oil, suspended matter and emulsified oil separately, and modifies the wastewater from three phases of oil, water and solid into two phases of oil and water, thereby reducing the difficulty of treating the oily wastewater and improving the treatment stability of the oily wastewater.

The present invention discloses an oil-water separation device for treating oily wastewater, which relates to the technical field of wastewater treatment devices, and comprises a reinforced support leg, a gravity separation mechanism is arranged on the top of the reinforced support leg, a freezing separation mechanism is arranged on the outer wall of the reinforced support leg, the gravity separation mechanism comprises an oil-water separation unit and a demulsification heating unit, the freezing separation mechanism comprises a drive transposition unit and a temperature adjustment unit, and the demulsification heating unit comprises a movable round seat. The present invention, through the design of the liquid inlet pipe, the user can inject the external demulsifier into the inner cavity of the hollow square tube, through the design of the rotating joint, the movable round seat and the manual driving handle, the user can manually rotate the hollow square tube as a whole, and the demulsifier will then be uniformly output from the one-way injection pipe to the inside of the wastewater, destroying the emulsified oil body inside the wastewater, so that the emulsified oil body floats up, thereby ensuring the adequacy of subsequent oil-water separation.

The present invention relates to a method for treating wastewater with high phosphorus content, high turbidity and high oil content, comprising S1, using a sand settling tank to remove sand and gravel in the wastewater; S2, using an oil removal and decolorization tank to remove pigments and oil in the wastewater; S3, passing the wastewater into a reaction tank, adding a suitable weight of lime to the reaction tank according to the phosphorus content, and then adding a suitable weight of flocculant to the reaction tank, the flocculant and the suspended matter in the wastewater undergo flocculation reaction to generate large particles of solid; S4, using an inclined tube sedimentation tank to remove large particles of solid; S5, using a phosphorus adsorption filler layer in a deep filtration tank to adsorb the residual phosphorus in the wastewater, and a filter material layer to filter out small particles of solid in the wastewater; S6, after the water quality test is qualified, the wastewater is discharged. The present invention can remove pigments and oil in the wastewater, reduce pollutants, and improve the quality of effluent water by setting an oil removal and decolorization tank. The deep filtration tank can further remove micro suspended matter and pollutants such as phosphorus in the wastewater to improve the quality of effluent water.

The invention discloses a piezoelectric SiC ceramic membrane with an in-situ self-cleaning function and application of the piezoelectric SiC ceramic membrane in oil-water separation, and the piezoelectric SiC ceramic membrane takes a SiC ceramic membrane as a base membrane and consists of the base membrane and UiO-66-NH2 (Hf) loaded on the base membrane. The piezoelectric SiC ceramic membrane provided by the invention has excellent membrane separation performance and self-cleaning capability, not only can effectively remove emulsified oil in oil-containing wastewater, but also can convert hydraulic pulse pressure into electroactivity when being used for oil-water separation, and in the oil-water separation process, an external power supply is not needed, and the oil-water separation efficiency is greatly improved by only periodically changing the hydraulic pressure of the oil-containing wastewater. Oil drops on the surface of the membrane can be demulsified and prevented from being accumulated on the surface of the membrane, so that an anti-pollution effect is achieved, and in-situ self-cleaning of the membrane is realized.

The invention belongs to the technical field of recycling of oily wastewater in water treatment, and provides a high-oil-content emulsified wastewater treatment process based on electrochemistry. Oil-containing wastewater enters the pretreatment unit, oil slick and suspended substances in water are removed through the pretreatment processes of filtration, air floatation, pH adjustment and the like, and the pH is adjusted to a proper range; the reacted oily wastewater enters an electrochemical device, and proper voltage is applied to an electrode, so that emulsified oil in the water is destabilized, and the purpose of demulsification is achieved; the oily wastewater enters an oil-water separation device, demulsified oil drops are coalesced, grow and float upwards, and recoverable oil is obtained on the upper layer of the device; after long-time operation, the water enters the regeneration unit, so that the electrochemical demulsification unit recovers good demulsification and oil removal effects. According to the invention, the treatment of various high-oil-content emulsified wastewater and the recovery of oil can be realized by regulating and controlling the voltage, and the method is suitable for electro-desalting wastewater, machining wastewater, cold rolling wastewater and the like.

The utility model provides a self-cleaning oil-water separator which comprises a box body and collecting barrels arranged on two sides of the box body, a sewage inlet pipe orifice is arranged at the upper end of the box body, a filter plate for filtering sewage is arranged in the box body, and a grease separation chamber is arranged at the lower end of the filter plate to separate grease. Side plates are elastically arranged on the two sides of the filter plate to seal the two sides of the filter plate and prevent oily wastewater from entering the deslagging channel, and when the scraper plate moves to the edge of the filter plate, the second sliding block pushes the first sliding block to move outwards, so that the side plates open the notches in advance, sundries and residues are guided into the deslagging channel, and the reciprocating motion of the scraper plate can effectively remove the sundries and residues on the filter plate; the sewage filtering efficiency is improved. The scraping plate is elastically arranged on the elastic pressing seat, hard contact between the scraping plate and the filter plate is avoided, the bottom of the scraping plate can be attached to the filter plate, and the scraping stability is improved.

The invention relates to the technical field of environmental protection equipment, and particularly discloses a continuous water-oil separation device which comprises a gravity separation tank and a pretreatment mechanism, a separation mechanism is mounted in the middle of the bottom end of the gravity separation tank, and a collection mechanism is jointly mounted between the lower part of the outer wall of the gravity separation tank and the middle of the bottom end of the separation mechanism; the separation mechanism comprises a centrifugal separation tank, an oil conveying pipe, an oil collecting hopper, a limiting ring, an adjusting tooth block and a hydrophilic oleophobic film; the oil conveying pipe is mounted at the top end of the centrifugal separation tank through a bearing; according to the oil-water separation device, oil-containing wastewater is subjected to gravity separation through the gravity separation tank, oil and water are subjected to centrifugal separation through the rotary centrifugal separation tank, and efficient oil-water separation can be achieved through the hydrophilic oleophobic film, so that the oil-water separation effect is further improved, and water and oil can be continuously and efficiently separated by adopting the separation device; the oil-water separation efficiency during treatment of a large amount of water-oil mixture is improved, and the requirements of modern industry on continuous, efficient and rapid oil-water separation can be met.

The application relates to a modified separation membrane in the technical field of membrane materials, a preparation method and application thereof. The modified separation membrane comprises a base film and a nanostructure layer on the upper surface of the base film and the membrane hole surface close to one side of the upper surface of the base film; wherein the pore size of the base film is 120-400 mu m; the nanostructure layer is composed of microparticles with a size of 100-1000 nm; the preparation method comprises 3D printing of the separation membrane; and the upper surface of the separation membrane and the membrane hole surface close to one side of the upper surface of the separation membrane are subjected to plasma treatment. The modified separation membrane preparation method combines the 3D printing technology and the membrane separation technology, improves the traditional membrane preparation process, finds a more optimal membrane replacement process, and the modification method is free of chemical agents, has the advantages of being more convenient and fast to operate, high in separation efficiency, low in processing cost, green and pollution-free, and the like, and has important significance in the aspects of membrane separation technology improvement and application of oily wastewater treatment.

The invention relates to a comprehensive treatment and recycling system and process method for cabin washing wastewater of a multi-chemical cabin washing station, and the comprehensive treatment and recycling system comprises an acid-alkali wastewater pretreatment device, a benzene wastewater pretreatment device, an oily wastewater pretreatment device, an alcohol wastewater treatment device and a domestic sewage pretreatment device, the acid-base wastewater pretreatment device, the benzene wastewater pretreatment device, the oil-containing wastewater pretreatment device, the alcohol wastewater treatment device and the domestic sewage pretreatment device are all connected with the comprehensive wastewater treatment device; the tank washing wastewater is classified and collected from a wastewater source path, and a targeted pretreatment process is adopted according to the physicochemical characteristics of each type of wastewater, so that the pressure of subsequent comprehensive treatment is greatly relieved, the stability and reliability of the treatment effect are guaranteed, and meanwhile, the wide applicability of the process is also improved; the pretreated comprehensive wastewater is subjected to a biochemical and advanced oxidation process, so that the economical efficiency of system operation and the final effluent effect are ensured.

The invention relates to the technical field of oily sewage treatment, in particular to an oily sewage oil-water separation tank which comprises a tank body and an oil-water separator arranged in the tank body. The pool body is sequentially provided with a liquid inlet tank, a liquid separation tank, an overflow tank and a water storage tank in the water flow direction, the oil-water separator is arranged between the liquid inlet tank and the liquid separation tank, and the interior of the oil-water separator is composed of a plurality of partition plates to form a continuous flow channel. The oil-water separator sequentially comprises a horizontal separation section, a torsion reversing section and a vertical layering section, and a partition plate is arranged to be in a horizontal, inclined or vertical state in different sections according to structural requirements, so that oil drops are guided to gradually gather and float upwards, and effective oil-water separation is realized. The structure is compact, the separation efficiency is improved by utilizing the geometric design of the flow channel, the liquid flow direction is improved, and the liquid flow speed in the flow channel is improved. The oil-containing wastewater pretreatment or recycling system is suitable for industrial and environmental protection fields.

The invention relates to the technical field of wastewater treatment, and discloses a treating agent for oily wastewater, a treating device and a treating method.The treating agent comprises the following steps that S1, the oily wastewater enters the treating device firstly, S2, the wastewater is lifted to a reaction tank through a pump, S3, the wastewater added with the agent enters an air flotation system, and S4, the wastewater enters the air flotation system. S4, enabling the clear liquid to enter a subsequent sedimentation tank or a filtering system under the control of the digital twinborn model, and judging whether an auxiliary flocculation or filtering step needs to be added or not by the AI system according to a simulation result of the twinborn model in combination with equipment operation parameters and real-time water quality data; s5, part of the wastewater enters an online water quality deep analysis module, and residual indexes are monitored. The self-adaptive AI control system is combined with a decision tree algorithm to analyze historical water quality data and recommend a treatment agent, so that a treatment strategy is automatically adjusted according to real-time water quality change in a wastewater treatment process, and an accurate and efficient wastewater treatment effect is obtained.

The invention relates to the technical field of oil-water separation, in particular to a renewable oil-water separation material as well as a preparation method and application thereof. According to the preparation method, a melamine foam material is soaked in a mixed solution composed of cane sugar, dopamine and a trihydroxymethyl aminomethane-hydrochloric acid buffer solution, and the renewable oil-water separation material is obtained; the renewable oil-water separation material can quickly and efficiently separate different types of oily wastewater such as kitchen oil, industrial oil and organic solvents, the separation efficiency can reach 99% or above, and the separation flux can reach 104-105 liters per square meter per hour. Moreover, the used renewable oil-water separation material can be repeatedly used after being fully soaked in an ethanol solution, and the separation flux and the separation efficiency are not obviously reduced. In addition, the renewable oil-water separation material has a wide oil-water separation effect and is suitable for industrial production.

The invention discloses wastewater oil-water separation equipment based on rubber recovery, and relates to the technical field of wastewater treatment.The wastewater oil-water separation equipment comprises a wastewater pool, an oil-water separation mechanism, an oil absorption mechanism and a synchronizing mechanism, a wastewater pipe is arranged at the bottom end of the side wall of the wastewater pool, and the oil-water separation mechanism comprises an oil-water separation box; the oil-water separation tank is arranged on one side of the wastewater pool and located below the wastewater pipe, and a drainage pipe is arranged at the bottom end of the side, away from the wastewater pool, of the oil-water separation tank. Oil-water separation treatment is conducted on oily wastewater guided into the oil-water separation tank through the first filter layer and the second filter layer, oil layers attached to the bottom end of the first filter layer and the surface of the second filter layer are adsorbed through the oil suction head, so that the first filter layer and the second filter layer can keep the filtering capacity, oil removal treatment is conducted regularly, and the oil removal efficiency is improved. The oil-water separation capability of the first filter layer and the second filter layer is maintained, the replacement frequency of the filter layers is reduced, and the treatment efficiency of oily wastewater is improved.

The invention provides a method for treating oily wastewater in the production and maintenance process of rail transit, which comprises the following steps: carrying out cleaning, drying, cutting and microwave treatment on waste cotton-based textiles of rail transit to obtain a waste cotton-based textile material, and carrying out ball milling treatment to obtain a pretreated waste cotton-based textile material; carrying out pyrolysis carbonization treatment on the cotton fiber biochar under a high-temperature condition to obtain cotton fiber biochar; the cotton fiber biochar is added into the oily wastewater in the production and maintenance process of the rail transit, and adsorption and oil removal treatment are carried out. The method provided by the invention not only realizes resource utilization of a large amount of waste textiles in rail transit, but also provides a new solution for the environmental pollution problem caused by oil-containing wastewater in a rail transit system. The scheme of treating waste with waste has important value and significance on recycling of waste and treatment of pollutants in rail transit, sustainable development of rail transit is facilitated, and the method has wide application prospects.

The invention relates to the technical field of separation of oil-containing wastewater, and particularly discloses a nano separation membrane material for separating oil-containing wastewater as well as a preparation method and application of the nano separation membrane material aiming at the problems of limited oil-water separation flux, poor anti-pollution performance and the like of a separation membrane material for treating the oil-containing wastewater at present. The nano separation membrane material comprises a nano base membrane and polydopamine (at) ZnIn2S4-CuS anchored on the surface of the nano base membrane, and the polydopamine (at) ZnIn2S4-CuS is a gear-shaped ZnIn2S4-CuS heterojunction material bridged with dopamine. According to the nano separation membrane material, through the gear-shaped ZnIn2S4-CuS heterojunction, the ultrahigh oil-water separation flux is achieved, the photocatalysis-photothermal conversion performance is achieved through the synergistic effect of ZnIn2S4-CuS and the polydopamine layer, and a feasible separation membrane material is provided for efficient separation treatment of complex emulsified oily wastewater; and meanwhile, the synergistic effect of gear-shaped CuS and ZnIn2S4 is utilized to promote efficient transfer of photo-induced electrons, generate abundant active substances, quickly degrade organic pollutants in the oily wastewater and play an anti-pollution role.

The invention relates to a system and a method for treating high-salinity oily wastewater by coupling photovoltaic-assisted electric flocculation with solar interface evaporation. The system consists of a photovoltaic power generation assembly, an electric flocculation assembly and a solar interface evaporation assembly, the photovoltaic power generation assembly is used for converting solar energy into electric energy and storing the electric energy in the storage battery; the electric flocculation component is used for carrying out flocculation and air floatation treatment on the high-salinity oily wastewater through an electric flocculation process by utilizing the stored electric energy so as to remove organic matters and part of salt in the wastewater; the solar interface evaporator utilizes solar energy to evaporate water in the wastewater, and meanwhile, salt in the wastewater is greatly reduced, and organic matters are further removed. According to the method, clean energy is provided through photovoltaic power generation, and the high-salinity oily wastewater is effectively treated by combining an electric flocculation technology and an interface evaporation technology. The treated water quality can reach the drinking water standard of the World Health Organization, and the method has the advantages of low operation cost, high treatment efficiency, small environmental influence and the like, and has important application value and wide market prospect in treatment of high-salinity oil-containing wastewater and other difficult-to-treat wastewater.

The invention discloses a treatment device for oil-containing emulsified wastewater, and belongs to the technical field of wastewater treatment.The device comprises a microbubble production module and a flotation module.The main body of the microbubble production module is a microbubble production tank, and the outer side of the microbubble production tank is fixedly connected with a rotational flow-venturi type microbubble generator; the rotational flow-venturi type microbubble generator is connected with the net-shaped turbulent flow structure and arranged on the inner side of the microbubble production groove, an opening is formed in the upper portion of the flotation groove, a hydrophobic film is arranged, and an oil collecting groove is fixedly connected to the hydrophobic film. The device can circularly treat the emulsified oil-containing wastewater, achieves the effects of improving the emulsified oil-containing wastewater treatment efficiency and the oil recovery rate, is convenient to operate, and is energy-saving and environment-friendly.

The present invention provides a cleaning method and application of a ceramic membrane, belonging to the technical field of water treatment, wherein the cleaning method comprises the following steps: (1) preparing a cleaning agent: the cleaning agent comprises the following components by mass: 20-25 parts of formic acid, 16-21 parts of phytic acid aqueous solution, 4-8 parts of citric acid, 9-14 parts of glycolic acid, 2-5 parts of softener, 3-6 parts of surfactant, 15-20 parts of isopropanol, and 40-45 parts of water; (2) preparing a solution of the cleaning agent, heating the solution to 25-30°C, performing non-permeation cycle cleaning, permeation cycle cleaning, and stopping cleaning; (3) inputting ozone into the system from the water production end of the ceramic membrane system in reverse, draining the ozone, rinsing with water until the drainage is neutral, and the cleaning process ends. The cleaning method of the present invention has a good cleaning effect on the ceramic membrane for treating cold rolling oily wastewater and the ceramic membrane for treating oilfield wastewater.

The invention discloses a preparation method and application of an oil-water separation film, and belongs to the technical field of oil-water separation.The preparation method comprises the following steps that 1, tetrabutyl titanate is subjected to hydrolytic annealing treatment, and titanium dioxide nanoparticles with the surfaces rich in hydroxyl are obtained; step 2, modifying the titanium dioxide nano-particles rich in hydroxyl groups to obtain silanized titanium dioxide nano-particles; 3, the silanized titanium dioxide nanoparticles are placed in a mixed solvent, ultrasonic dispersion is carried out for 10 min, a homogeneous precursor solution is obtained, polylactic acid is added, stirring dispersion is carried out until the solution is transparent, a spinning solution is obtained, electrostatic spinning is carried out on the spinning solution, and the oil-water separation film is obtained.The obtained oil-water separation film has the excellent oil-water separation characteristic. In addition, the oil-water separation membrane can effectively purify oil-containing wastewater, and can be naturally degraded after the service life is ended, so that the negative influence on the environment is reduced to the greatest extent.

The invention provides an intelligent temperature control grease separator and a use method. The intelligent temperature control grease separator comprises a temperature control assembly, and the temperature control assembly comprises a separation box, a heat conduction plate, a circulation channel, a water outlet pipe, a heating water tank, a circulation water pump, a water inlet pipe, a screw and a liquid temperature sensor. Through the temperature control assembly, the temperature in the separation process can be accurately controlled, the problem that the grease separation effect of a traditional grease separator is unstable in the environment with large temperature change is effectively solved, the separation efficiency and effect are improved, meanwhile, the working states of a spiral heating rod and a circulating water pump are intelligently adjusted, and the separation efficiency is improved. Automatic temperature control is achieved, manual intervention is reduced, and the reliability and stability of equipment are improved; according to the oil-containing wastewater treatment device, through multi-stage separation of oil-containing wastewater, grease and impurities in the wastewater can be effectively removed, the separation effect is improved, meanwhile, due to the arrangement of the air blowing pump and the strip-shaped air blowing box, oil liquid in water can be further separated through blown-out air, and separation is more thorough.

The invention belongs to the technical field of separation membrane materials, and discloses a graphene oxide modified hollow fiber membrane for oily wastewater treatment and a preparation method of the graphene oxide modified hollow fiber membrane. Firstly, a hollow fiber base membrane is prepared through a phase inversion method; then performing oxygen plasma pretreatment to activate the surface; immersing the activated base membrane into a Tris-HCl buffer solution of dopamine and polyethyleneimine, and forming a polydopamine intermediate layer on the surface of the membrane through auto-polymerization of dopamine; and finally, firmly loading the graphene oxide nanosheets on the surface of the base membrane by using the intermediate layer to form a graphene oxide functional surface layer, and carrying out vacuum drying to obtain a final product. A three-layer gradient structure of'base membrane-polydopamine middle layer-graphene oxide surface layer 'is constructed, the hydrophilicity of graphene oxide is utilized to form a water membrane on the surface of the membrane, oil drops are repelled, the anti-pollution performance of the membrane is improved, the problem that the coating is easy to fall off is solved by means of the adhesion of polydopamine, and the preparation process is simple and controllable and is suitable for large-scale production.

The invention discloses a tough underwater superoleophobic gel composite coating and a preparation method thereof.The preparation method specifically comprises the following steps that 1, a base material is soaked in a mixed solution of tannic acid and 3-aminopropyltriethoxysilane, after a period of time, the base material is taken out and soaked in a ferric chloride solution, and a nano-particle modified filter screen is obtained after drying; (2) loading the gel precursor solution on a nanoparticle modified filter screen through a dip-coating method, and preparing a gel composite filter screen under ultraviolet initiation; and (3) soaking the gel composite filter screen in a sodium citrate aqueous solution, and taking out the gel composite filter screen to obtain the tough underwater super-oleophobic gel composite coating modified fishing net. According to the method, the tough underwater super-oleophobic gel composite coating modified fishing net is prepared by adopting an impregnation method and ultraviolet initiation, the preparation process is simple, and the prepared gel composite coating has excellent oil stain resistance, mechanical stability and chemical stability and can be applied to crude oil adhesion prevention and oil-water separation of industrial oily wastewater.

The invention discloses a hydrophilic oleophobic filter material as well as a preparation method and application thereof. The hydrophilic and oleophobic filter material is surface aminated hard particles grafted with polybasic acid, and the hydrophilicity of the hard particles is remarkably improved through amino-carboxylation; on the basis of a silanization reaction, a stable Si-O-Si covalent bond network is formed, an amino functional group is anchored, and further through an amidation reaction, a carboxylic acid group of polycarboxylic acid is directionally introduced into the surface to form a dense strong-polarity modification layer, so that the hydrophilic oleophobic filter material has high stability, long-acting property and excellent underwater oil stain resistance; the hydrophilic and oleophobic filter material and the hydrophobic and oleophylic filter material can form a non-uniform wettability filter material, the hydrophilic particles construct a low-resistance water phase channel to reduce head loss, the hydrophobic particles are utilized to realize interface demulsification and oil drop coalescence, non-demulsified micro-drops are screened and adsorbed layer by layer through a multi-stage filter bed, deep oil-water separation is achieved, and oil-water separation is realized. And the method has strong adaptability to complex oily wastewater containing surfactants and high acid, alkali and salt properties.

The invention belongs to the technical field of chemical separation, and relates to a bionic on-demand emulsion separation membrane which is formed by compounding a normal beetle wettability fiber layer and an anti-beetle wettability fiber layer, and the two layers form a stable laminated structure through mechanical entanglement of fibers, the thickness of the normal beetle wettability fiber layer and the thickness of the anti-beetle wettability fiber layer are both 0.2-500 micrometers, and the thickness ratio of the normal beetle wettability fiber layer to the anti-beetle wettability fiber layer is 1: 0.2-5. The invention also discloses a preparation method of the bionic on-demand emulsion separation membrane. According to the invention, bionic design and asymmetric wettability technology are utilized to realize high-efficiency treatment of oil-containing wastewater. The method has the advantages that the separation effect is improved by a bionic synergistic demulsification mechanism; multiple types of emulsions are efficiently separated, energy consumption is low, and external stimulation is not needed; the bionic synergistic demulsification mechanism based on positive beetle wettability and anti-beetle wettability is achieved, the separation effect is remarkably improved, the advantage of performance integration is achieved, and efficient on-demand separation of water-in-oil emulsion and oil-in-water emulsion through a single membrane material is achieved.

The utility model relates to the technical field of oil-containing wastewater treatment, and discloses an oil-removing device for oil-containing wastewater treatment of an oil and gas field, which comprises a tank body, and a cleaning mechanism and an oil filtering mechanism are arranged in the tank body; the cleaning mechanism comprises a tank cover, a connecting frame and a feeding pipe are fixedly connected to the top of the tank cover, an electric push rod is fixedly connected to the interior of the connecting frame, a scraping plate is fixedly connected to the output end of the electric push rod, a feeding frame is fixedly connected to the top of the feeding pipe, and a filter screen is fixedly connected to the inner wall of the feeding frame. The oil filtering mechanism comprises a supporting ring, and an oil-water separation filter element is arranged at the top of the supporting ring; a discharge pipe is fixedly connected to the bottom of the tank body, and a first switch valve is mounted in the discharge pipe. According to the oil-removing device for oil-containing wastewater treatment of the oil and gas field, residual oil stains and impurities on the inner wall of the tank body are automatically cleaned, the labor intensity of operators is reduced, the cleaning effect is guaranteed, and secondary pollution is avoided.