156results about How to "Increase separation speed" patented technology

Ultraporous sol gel monoliths and methods for preparing the same are provided, having superior flow characteristics for chromatography and analytical chemistry applications. The methods for forming an ultra porous sol-gel monolith include (a) forming a solution comprising a porogen, a matrix dissolving catalyst and a sol gel precursor; (b) allowing the solution to form a gel; and (c) drying the gel at an elevated temperature. The ultraporous sol gel monoliths are characterized by a porosity of up to about 97%, a BET surface area of at least about 50 m2 / g and substantially no micropores.

The invention provides a method for producing high-quality collagen oligopeptide by using fish skin or fishbone. The method comprises the following steps of: washing and crushing the fish skin or fishbone as a raw material, mixing the crushed material and water according to a weight ratio of 1:(5-20), carrying out refining treatment, then sterilizing and cooling, simultaneously adding proteolytic enzyme and lactobacillus to carry out primary hydrolysis, then centrifuging and filtering to separate a non-hydrolyzed solid part and hydrolysate, carrying out ultrafiltration on the hydrolysate by adopting an ultrafiltration film, mixing a macromolecular peptide solution which does not pass through the ultrafiltration film and the non-hydrolyzed solid part which is separated after the primary hydrolysis is finished, simultaneously adding protease and lactobacillus to carry out secondary hydrolysis, carrying out centrifugal separation and filtration, then carrying out ultrafiltration, and sequentially purifying, sterilizing, condensing and drying a micromolecular oligopeptide solution which passes through the ultrafiltration film and micromolecular oligopeptide collected after the primary hydrolysis to obtain the collagen oligopeptide product with low molecular weight. According to the method provided by the invention, the utilization rate and the yield of the raw material protein can be effectively improved, and the product quality can be greatly improved.

A multi-dimensional separation system having parallel traps for effluent from prior separation dimension and parallel latter separation columns, the latter columns being coupled to the traps. At least one trap enriches components of effluent while at least one other trap is releasing trapped components to a detector, which may be a mass spectrometer. Internal standards may be provided, as in a release solvent, for the calibration of one of the chromatographic columns and the detection system. The system may comprise a multiple channel selector for multiple streams, wherein all of the streams flow at the same time.

The invention discloses a miniature gas chromatographic column integrated chip with rapid separation function, and relates to gas chromatographic column integrated chip technology. The integrated chip includes a miniature chromatographic column, combined miniature heaters, and combined miniature temperature sensors. Miniature chromatographic column channels are formed on a silicon substrate by deep etching or chemical etching based on microelectromechanical system (MEMS) technology, then the silicon substrate is hermetically bonded with glass to form the miniature chromatographic column; before bonding, the combined miniature heaters are integrated in the channels and the substrate bottom where the channels are located; and through combined heating, rapid temperature rise is realized, and separation speed and separation performance of the miniature chromatographic column are improved. Meanwhile, the combined miniature temperature sensors are integrated on the upper and the lower surfaces of the channels and in the channels of the miniature chromatographic column, to real-time respond temperature of a gas sample in the miniature chromatographic column, thereby facilitating heating state adjustment of the miniature heaters by an external control circuit, controlling temperature of the miniature chromatographic column, and enabling the miniature chromatographic column to achieve rapid separation, and excellent total separation performance is realized.

The invention discloses oil-water separation copper foam and a preparation method thereof. The preparation method comprises the following steps of: selecting three-dimensional through-hole copper foam with the thickness of 1-3mm and the aperture size of 400-1500mu m, cutting the copper foam into required size, respectively washing with acetone and ethanol in an ultrasound environment, drying with nitrogen, immersing in dilute acid for treatment, then washing with a diluted alkaline solution and deionized water, and drying; then immersing in a closed 5-DEG C ammonia-water solution with the thickness of 0.1-0.5mol / L for 12-48 hours, taking out, washing with clean water and drying; finally soaking in stearaic acid modification liquid for 30-90 minutes under a 80-95 DEG C water bath condition, then washing with an ethanol solution so as to remove unabsorbed or weak unabsorbed stearaic acid molecules and other impurities on the copper foam, and finally drying to obtain the long-chain alkane molecular modified copper foam. The copper foam has a high-efficiency oil-water separation characteristic.

A substance (for example, methylcellulose) that undergoes a reversible gel to sol phase transition is utilized in a recovery method for specific micromaterials such as DNA molecules, cells, microorganisms and the like, approximately several μm in size, from a mixture containing other micromaterials, and a micromaterial is accurately and conveniently recovered. The present invention is a method of recovering a desired micromaterial in a system comprising a medium that undergoes a reversible phase transition between a sol and a gel, a support material and micromaterials, comprising the steps of converting the medium surrounding the micromaterial to be recovered into a gel locally to immobilize said micromaterial on said support along with the gelled medium, removing the medium and micromaterials not immobilized on said support material and converting the gelled medium to a sol to recover the micromaterial.

The invention relates to a method for performing emulsion breaking on an oil-water emulsion by an ultrasonic wave. In the method, one or more ultrasonic generators are arranged in a raw material storage tank or a settlement tank in the gravity settling direction, only one ultrasonic generator acts in the direction of the same vertical line. An emulsion breaking device for implementing the method comprises the raw material storage tank or the settlement tank, and one or more ultrasonic generators are arranged at the bottom or / and top of the raw material storage tank or the settlement tank. The ultrasonic generators are distributed reasonably according to structural size and ultrasonic radiation areas, so that the ultrasonic generators cover comprehensively, and are prevented from being overlapped. The ultrasonic generators are connected with ultrasonic distributors, and one ultrasonic generator is arranged in one ultrasonic distributor. The action direction of the ultrasonic wave is the vertical direction and is consistent with the gravity settling direction, so the driving force is added in the oil-water settling direction, and the oil-water settling speed is accelerated. The device is uniform in ultrasonic wave energy distribution, excellent in emulsion breaking effect, simple in operation, convenient to run and maintain and low in running cost.

The invention discloses a preparation method and application of a magnetic modified sodium alginate flocculating agent. The preparation method comprises the following steps: grafting partially oxidized sodium alginate by using thiosemicarbazide, and performing reaction with Fe3O4 nanoparticles of which the surfaces are modified by amino groups to obtain a magnetic thiosemicarbazide-sodium alginate flocculating agent with a special effect. The method mainly comprises the following three reaction processes of (1) reacting the partially oxidized sodium alginate with the thiosemicarbazide to generate a Schiff base, and reacting the Schiff base with NaBH4 to generate stable amine; (2) preparing the magnetic Fe3O4 nanoparticles by using a co-precipitation method, and performing surface modification on the Fe3O4 nanoparticles by using gamma-aminopropyltriethoxysilane (KH-550); (3) reacting thiosemicarbazide-sodium alginate with the modified Fe3O4 nanoparticles to obtain the magnetic sodium alginate flocculating agent (ST-Fe) at room temperature in the presence of a catalyst EDC / NHS. The obtained product can be applied to sewage treatment and precious metal recovery, has the advantages of efficient adsorption, high sedimentation speed, simplicity in separation, low cost, biodegradability, no secondary pollution and the like, and has wide industrial application prospect.

The invention discloses an amphoteric electrolyte-modified hybrid silica gel material. An amphoteric electrolyte containing an amino group and a carboxyl group is bonded on a branch of the hybrid silica gel to obtain a hybrid silica gel material with an amphoteric group on the surface. A preparation method of the hybrid silica gel material comprises the following steps of: forming a hybrid silica gel material containing amino on the surface by taking tetraethoxy silane and aminopropyltriethoxy silane as precursor molecules and taking hexadecyl trimethyl ammonium bromide as a template agent; enabling the hybrid silica gel to react with the aldehyde group of glutaraldehyde to generate a hybrid silica gel material with a C=N bond; enabling the aldehyde group at the other end of glutaraldehyde on the hybrid silica gel material to react with the amphoteric electrolyte with the amino group and the carboxyl group to generate a hybrid silica gel material with double C=N bonds; and reducing with NaCNBH3 to reduce C=N into C-N to form a hybrid silica gel material with multiple -NH2 groups and multiple -COOH groups. A solid-phase extraction column or solid-phase extraction capillary tube prepared from the hybrid silica gel material gives play to the advantages of anion-cation exchange on the same material at the same time by controlling the pH value, and realizes synchronous extraction of acid, neutral and alkali samples; and moreover, the adsorption and desorption are fast, the reproducibility and recovery rate are high, and the speed and precision of detection and separation can be improved.

A block copolymer is provided. The block copolymer according to an exemplary embodiment includes a first block represented by Chemical Formula 1 and a second block represented by Chemical Formula 2:wherein COM1 and COM2 are independently selected from a polystyrene moiety, polymethylmethacrylate moiety, polyethylene oxide moiety, polyvinylpyridine moiety, polydimethylsiloxane moiety, polyferrocenyldimethylsilane moiety, and polyisoprene moiety, R1 is hydrogen or an alkyl group with 1 to 10 carbon atoms, Ph is a phenyl group, a is 1 to 50, R2 is hydrogen or an alkyl group with 1 to 10 carbon atoms, and b is 1 to 50.

A process for separating U from Pu in Purex flow includes such steps as cleaning U and Pu, in the HNO3 medium extracting the U and Pu in organic phase TBP solution, adding reducing agent, stirring to reduce Pu(IV) to Pu(III), and back extracting the Pu(III) into water phase HNO3 solution. Said reducing agent is hydroxyurea (HU). Its advantages are high speed and high efficiency.

The invention relates to a turnover satellite borne antenna locking releasing device which consists of a switchover piece, a rotor shaft, a torsional spring, a pressure plate, a locking lever, a limitcover, a spring cover, a spring, a locknut, a ball pad, a support and a cutter. The invention effectively transforms the impact force applied to the locking lever in cutting to the release power through the limit cover on the pressure plate, and the release power and the torsional force of the torsional spring act together, thereby increasing the separating speed between the pressure plate and the support and increasing the separating reliability. The exposed part of the locking lever under the pressure plate is shorter after the locking lever is cut, the turnover angle of the pressure plateis big, and the pressure plate is kept to be fixed after being in place under the moment action of the torsional spring so as to enable the pressure plate to keep a longer distance from the support, thereby ensuring the rotation reliability of the antenna; meanwhile, the invention has simple structure, therefore facilitating production and manufacture.

Device for use in a fluidized bed reactor includes a gas-solid separator communicated with an outlet of the fluidized bed reactor; a vertically arranged damper, a solid outlet of the gas-solid separator communicated with a lower region of the damper, a gas outlet of the gas-solid separator communicated with an upper region of the damper; a fine gas-solid separator, an inlet of the fine gas-solid separator communicated with the upper region of the damper, and a solid outlet of the fine gas-solid separator communicated with the lower region of the damper. Product from the fluidized bed reactor is fed into the preliminary gas-solid separator, most solid catalysts separated and fed into the lower region; the product entraining the rest catalysts is fed into the upper region, and into the fine gas-solid separator, the rest catalysts fed into the lower region; and final product is obtained from the fine gas-solid separator.

The invention relates to a deoiling method for cold rolling oil-rich emulsion wastewater, and a device thereof. The method comprises the following steps: 1, filtering pretreatment; 2, oil-water separation; and 3, waste oil recycling. An oil-water separator comprises an oil-water rectifier, a porous filled area and a multilayer folded plate oil-water separation area, the porous filled area and themultilayer folded plate oil-water separation area are filled with functional nano-fiber filter cores, and every functional nano-fiber filter core is a 304 stainless steel wire fiber and modified polypropylene fiber hybrid fabric filter layer, wherein the denier (fiber diameter) of each of the 304 stainless steel wire fiber and the modified polypropylene fiber is 50-500 nm. The method and the device thereof have the advantages of good treatment effect, low running cost, no secondary pollution, and realization of waste oil recovery.

For a reforming device that generates fuel gas for fuel cells by decomposing hydrocarbon compounds such as natural gas and then using a hydrogen separation composite to selectively transmit hydrogen, a hydrogen separation composite having the following structure is used. A porous support medium made of ceramics, etc. is formed, and a hydrogen separation metal is supported in the pores so as to fill the inside of the support medium. It is also possible to support a reforming catalyst. By doing this, it is possible to increase the area at which the hydrogen separation metal contacts gas, so the hydrogen transmission performance is increased. Furthermore, to prevent raw material gas leaks due to pin holes, high pressure gas is supplied to the hydrogen extraction side, and the total pressure is made higher than the pressure on the raw material gas supply side without making the hydrogen partial pressure higher. By using these means, it is possible to increase the hydrogen separation performance for the reforming device and to make the device more compact.

The invention relates to a liquid drop micro-fluidic chip used for detecting the diabetes with high sensitivity and a detection method, and belongs to the technical field of microfluidics. The liquiddrop micro-fluidic chip sequentially comprises a cover glass layer 20, an upper fluid passageway layer 30, a lower fluid passageway layer 40 and a base layer 50; and a liquid drop micro-fluidic chip based high sensitivity diabetes detection device comprises a high pressure liquid phase chromatographic pump 2, a sample inlet valve 3, the liquid drop micro-fluidic chip 6, a deuterium lamp and a halogen tungsten lamp source 10, an ultraviolet-visible light spectrometer 11 and data processing software 13. The provided micro-fluidic chip is small in size, low in cost and simple in operation, and isfavorable for real-time detection on the site. The high sensitivity diabetes detection method is not only suitable for the high sensitivity detection of a sample HbA1c, but also suitable for detection of biomacromolecules like polypeptide, nucleic acid and protein.

The invention provides an enrichment-thermal desorption-chromatography separating unit. The enrichment-thermal desorption-chromatography separating unit is composed of a rapid enrichment thermal desorption device, a sample introduction device, and a rapid separating device; the rapid enrichment thermal desorption device is used for realizing low temperature enrichment of target components in gas samples using an adsorption tube at the action of low temperature of carbon dioxide gas, and realizing rapid heating thermal desorption via a heating wire, wherein an adsorbent is arranged in the adsorption tube, and the adsorption tube is enwound by the heating wire; after enrichment and desorption, the target components are delivered into the rapid separating device via the sample introduction device; a low temperature carbon dioxide gas cooling chromatographic column is adopted in the rapid separating device, relatively low chromatographic column initial temperature and relatively high heating rate are achieved via combination of the low temperature carbon dioxide gas cooling chromatographic column with a rapid heating module, so that high separation effect, extremely high analysis speed, and high peak capacity are achieved. The enrichment-thermal desorption-chromatography separating unit is capable of realizing on-line enrichment, rapid desorption, and super rapid gas chromatography of trace components in gas samples.

The invention relates to the field of information security authentication, in particular to an identification method and identification system for anti-counterfeiting information of a certificate, andthe identification method comprises the steps: obtaining a certificate image containing the anti-counterfeiting information; correcting and segmenting the certificate image to obtain a plurality of anti-counterfeiting areas, identifying the plurality of anti-counterfeiting areas respectively, and outputting identification results corresponding to the anti-counterfeiting areas in sequence; and judging the authenticity of the certificate image in combination with the identification result corresponding to each anti-counterfeiting area. The identification method has the advantages that the detection of the anti-counterfeiting information is comprehensive, the anti-counterfeiting detection of various certificates can be covered, the efficiency and the accuracy are higher compared with the traditional mode, and the safety is integrally improved.

The invention relates to a silicone oil fan clutch with controllable separation speed. The silicone oil fan clutch with controllable separation speed comprises a sealed bearing, a shell arranged on an outer ring of the sealed bearing and a driving shaft arranged on the inner ring of the sealed bearing. A driving disc is arranged on the driving shaft, the driving disk is arranged in the shell, and an oil storage cavity is formed in the shell. An oil-guiding groove is formed in an outer cylindrical surface of the driving disc, and a raised rib strip is also arranged on the outer cylindrical surface of the driving disc. The silicone oil fan clutch with controllable separation speed provided by the invention has the advantages that a raised rib strip is further arranged on the outer cylindrical surface of the driving disc, when the silicone oil fan clutch transforms from a meshed mode into a separated mode, the rib strip can guide a fraction of silicone oil into a clearance between the outer cylindrical surface of the driving disc and the shell from a clearance between the upper portion of the driving disc and the shell, an oil pressure zone with certain pressure is formed on one side of the rib strip, the additional transmission function is generated in this way, and the separation speed of the silicone oil fan clutch is improved.

The invention discloses a method for producing a low-sulfur marine fuel oil blending component by using high-sulfur heavy oil. The method comprises that a) a high-sulfur heavy oil raw material entersa visbreaking device, and is subjected to visbreaking to obtain a visbreaking residue oil; b) a composite modifier is added to the visbreaking residue oil obtained in the step a), and the obtained mixture is continuously settled, wherein an overflow material is obtained from the upper portion, and an underflow material is obtained from the lower portion; and c) the overflow material obtained in the step b) enters a fixed bed residual oil hydrogenation device, and is subjected to hydrodesulfurization to obtain the low-sulfur marine fuel oil blending component. According to the present invention, the method is particularly suitable for the mass-production of low-sulfur marine fuel oil blending components, has advantages of mature technology, low operating cost of equipment and the like, andcan improve the yield of visbreaking light oil products, increase the added values of products, and easily weaken the influence on the catalyst activity stability in the subsequent fixed bed hydrotreating process.

The invention belongs to the technical field of solid-liquid separation and particularly relates to a filter system and method for collecting solid mineral grains from a lean-phase superfine mineral suspension liquid. The filter system disclosed by the invention comprises n filters (1), matched delivery pumps (21) and pipe fitting valves, wherein cylinders of the filters are made of plastic, and filter elements (5) are PVC (polyvinyl chloride) sinter filter elements with apertures smaller than 1 micron; corresponding control valves are respectively arranged on matched pipelines, and the filtering separation is controlled by combining a preset filtration time with the saturated filtration pressure in an operation process. As the filter system and the method are utilized for collecting the solid mineral grains from the lean-phase superfine mineral suspension liquid, the mineral recovery rate is improved, and the production efficiency is greatly increased; by controlling the filtering separation operation, the complete regeneration of a filter device is guaranteed; the device is low in manufacturing cost and long in service life and is light, convenient and durable; by utilizing a detachable structure, the filter system is easy to dismount and mount and convenient to maintain.

The invention relates to a preparation method for light-pyrolysis carbon black. The method comprises the following steps: 1) subjecting waste rubber to light pyrolysis in a combined extruding apparatus composed of a screw with a temperature in a range of room temperature to 280 DEG C and a screw rod with a temperature in a range of 280 DEG C to 350 DEG C; 2) subjecting pyrolysis products to dissolving, extracting and separating with solvents; and 3) carrying out crushing and drying on a residual product obtained after extraction so as to obtain light-pyrolysis carbon black, wherein the surface of the obtained light-pyrolysis carbon black has bonding glue and zinc oxide, and the carbon black can form high-content bonding glue with novel rubber. Compared with the prior art, the preparation method is environment-friendly; the obtained carbon black can be perfectly bonded with rubber and has excellent reinforcing performance; and the method is a novel method for recovery and high-added-value utilization of waste rubber.

The invention discloses a method for determining benzoapyrene (B[a]P) in the main stream smoke of a cigarette by supercritical fluid chromatography (SFC)-gas chromatography-mass spectrometry (GC-MS). The method comprises the following steps: adding an internal standard substance and a cyclohexane solution into a filter element for capturing total particulate matters of the main stream smoke of the cigarette after the cigarette is smoked; performing ultrasonic extraction, separating and purifying the extract with SFC; cutting fraction containing B[a]P, and analyzing with GC-MS; and fixing the quality according to the area ratio of a target peak to an isotope internal standard substance peak. According to the method, trace to-be-determined ingredient in a complex substrate can be separated from an interfering substance, interference of other substances can be eliminated, and the detection accuracy can be improved. The method has the advantages of simple pre-treatment, high separation speed, accurate quantity, low detection limit and the like.

The invention relates to an optical flow control chip utilizing impinging stream and optical scattering force and application thereof for sorting micro-nano particles, belonging to the field of optical flow control chips. The optical flow control chip comprises a cylindrical optical separation cavity, wherein one side of the optical separation cavity is connected with an impinging stream inlet through an impinging stream channel, the other side of the optical separation cavity is provided with an auxiliary flow inlet and a sample flow inlet, the center line of a channel formed by converging of an auxiliary flow channel and a sample flow channel and the center line of the impinging stream channel are positioned on the same straight line, and two sides of the channel formed by converging of the auxiliary flow channel and the sample flow channel are respectively connected with an inlet of sheath flow through a sheath flow channel, and then are connected with the optical separation cavity; an optical fiber groove with a collimating lens, as well as a large-particle outlet and a small-particle outlet, is further formed in the optical separation cavity. According to the invention, a point with the minimal speed value is formed at the center of an optical sorting cavity, so that an optical scattering force can be used for sorting particles at the point, the average speed of sorting operation by the optical force is greatly improved, and the sorting precision and efficiency are improved.

A downhole oil, gas, water and sand separation method and separator (10). The downhole oil, gas, water and sand separation method comprises: step 1: dividing an oil jacket annulus into a plurality of spaces in an outflow direction of produced liquid, wherein each space is provided with an accommodating cavity (21) communicated with the oil jacket annulus; step 2: arranging a plurality of liquid inlet hole groups (11) in a liquid outlet pipeline (1) of the produced liquid in the outflow direction of the produced liquid, wherein each of the liquid inlet hole groups (11) is communicated with one of the accommodating cavities (21); and step 3: separating oil, gas and water after the crude oil in the oil jacket annulus flows into each of the accommodating cavities (21), wherein separated oil drops or bubbles flow back to the oil jacket annulus from the accommodating cavities (21), and separated produced liquid simultaneously flows into the liquid outlet pipeline (1) through the plurality of liquid inlet hole groups (11). The downhole oil, gas, water and sand separation method and separator can realize a rapid downhole oil-water or gas-water separation in the high water-content crude oil.

The invention relates to a purification separation and recovery system for a mixed gas. The system comprises a pretreatment unit, a gas separation unit and a pure-gas recovery unit which are connectedin series; the upstream end part of the pretreatment unit is provided with a recovery opening used for connecting with a switch air chamber; and the gas separation unit comprises a primary membrane separator connected with the downstream end part of the pretreatment unit, the downstream of the primary membrane separator is connected with a first secondary membrane separator and a second secondarymembrane separator in parallel, and the first secondary membrane separator is connected with a nitrogen outlet of the primary membrane separator, the second secondary membrane separator is connectedwith a sulphur hexafluoride outlet of the primary membrane separator, the nitrogen outlet of the first secondary membrane separator is vented, the sulphur hexafluoride outlet is connected with the pretreatment unit through a reflux pipeline, the nitrogen outlet of the second secondary membrane separator is connected with the pretreatment unit through a reflux pipeline, and the sulfur hexafluorideoutlet is connected with the downstream pure-gas recovery unit. According to the system provided by the invention, the two secondary membrane separators are separately used for especially separating anitrogen gas and sulfur hexafluoride, and therefore the separation effect is improved.

The invention discloses solid-liquid separation equipment, which comprises a base. The top of the base is fixedly connected with a separation box; a separation cavity and a solid storage cavity are formed in an inner cavity of the separation box; a water inlet communicating with an inner cavity of the separation cavity is formed in the top of the separation box; a supporting frame is fixedly connected to the inner cavity of the separation cavity; a separation plate is movably connected to the top of the supporting frame; separation holes are formed in the surface of the separation plate; and amotor cavity is formed in the inner cavity of the separation cavity. According to the solid-liquid separation equipment which relates to the technical field of solid-liquid separation equipment, theseparation plate is obliquely arranged, solid and liquid are separated, during separation, the waterproof motor is started to drive a cam to rotate, the separation plate is driven to vibrate up and down through up-down movement of a buffer block, the separation speed is increased, and the situation that separation cannot be continued due to the fact that solid blocks the separation hole can be effectively prevented.

The invention discloses an efficient refrigerator oil separation device, and belongs to the technical field of refrigerant recovery and refrigerator oil separation. The efficient refrigerator oil separation device comprises a separation tank (5), wherein a heating device (4) is arranged on the outer wall of the separation tank (5); a refrigerant inlet (1) is formed in the top of the separation tank (5); a refrigerant outlet (2) is formed in the separation tank (5), and extends from the bottom of the separation tank (5) to the top of the separation tank (5); and a refrigerator oil outlet (6) is formed in the bottom of the separation tank (5). A gas-liquid mixture of refrigerant mixed with part refrigerator oil enters the separation tank from the refrigerant inlet in the top of the separation tank, and moves from top to bottom; under the effect of the heating device, the internal temperature of the separation tank is controlled in a range of 40-60 DEG C; and in the sinking process of the refrigerant gas-liquid mixture in the temperature range, the refrigerant is gasified, and the refrigerator oil is continuously kept in a liquid state to be separated out from the refrigerant.

The invention provides a two-stage treatment method for production wastewater, which includes the following steps: 1) reducing the pressure of the production wastewater, which is separated through a production separator, through an air floatation inlet ejector, and feeding the production wastewater into a rotational flow air floatation device for separation; 2) continuously discharging a continuous oil, bubble and scum layer, which is formed on the upper part in water in a pot body of the rotational flow air floatation device, into a sewage oil pot through a short pipe which is hung on the top and stretched into the pot, alleviating the separated water flow through a horizontal circular board in the middle-lower part, discharging the water through a water outlet, and feeding the water into a dual-medium filter through pressurization in a filter material feeding pump; and 3) when the treated water reaches a water injection standard, feeding the water into a degassing pot to mix the water with well water from a water source to perform reinjection, wherein back-wash water from the dual-medium filter is fed into the sewage oil pot. The two-stage treatment method has quick separation, good filter effects, strong sewage blocking capability, is stable in operation, is short in back-wash time and is complete in the back-wash, and is compact in equipment structure.