118 results about "Dissolved air flotation" patented technology

The invention discloses sewage treatment equipment and method for oil field thickened oil produced water. The equipment comprises pretreatment equipment, main body equipment, dissolved gas supply equipment and a water outlet pump. Main body equipment comprises barrel equipment, and a flotation cyclone used for achieving the functions of dissolved air flotation and cyclone separation at the same time, separating out large-particle suspended solids through centrifugal force difference and achieving floating of oil drops through microbubble adsorption surfaces is sequentially arranged on the inner portion of the barrel equipment from top to bottom. The coalescence filler layer is made of oleophylic and hydrophobic core-shell structure fibers, and emulsified oil is promoted to polymerize and break emulsion through surface energy difference; and the inclined plate sedimentation device adopts an inclined tube labyrinth surrounding structure, performs deep sedimentation by utilizing a laminar flow principle, and further removes oil drops formed after coalescence.

The invention provides an ozone dissolved air flotation system and a dissolved air release control method thereof. The system comprises a gas dissolving unit, an ozone floatation unit, a detection module, a control module and an adjusting module, the gas dissolving unit is used for transmitting generated data to the detection module; the ozone air floatation unit transmits the generated flow, pressure and water quality parameter data of an air floatation tank to the detection module; the detection module monitors the running states of the air dissolving process and the air floatation process in real time, and transmits the collected real-time data to the control module; the control module performs comprehensive judgment on the data through the core algorithm unit according to the sewage treatment mechanism model, the LSTM neural network and the fuzzy control logic, and generates a corresponding control instruction; and after receiving the instruction of the control module, the adjusting module adjusts the corresponding equipment through an execution element. According to the invention, multi-parameter dynamic coordinated regulation and control of the ozone dosage and the dissolved gas pressure can be realized, and the ozone utilization rate and the system response speed are obviously improved.

The invention relates to the technical field of air flotation tanks, and discloses a dissolved air flotation separation device and an atmospheric and vacuum electro-desalting sewage pretreatment process, the dissolved air flotation separation device comprises a tank body, an oil outlet is arranged above the tank body, and a weir plate is arranged in the tank body. According to the device, a complete process from scum gathering to graded discharge is constructed through the scum gathering effect of the conical structure of the weir plate, the layered guide of the spiral flow deflector and the self-adaptive linkage of the detection paddle and the weir gate. The deflection angle of the detection paddle is in positive correlation with the viscosity and thickness of scum, the dynamic adjustment can be accurately converted into dynamic adjustment of the opening degree of the scum discharge port, the large opening degree is kept for rapid discharge when thin scum exists, the opening degree is reduced for screening dry scum when thick scum exists, the problem of scum accumulation or scum discharge with water is effectively avoided, and finally the high-purity dry scum discharge effect is achieved. The separation efficiency and the separation quality of the scum and the sewage are obviously improved.

The invention relates to the technical field of industrial wastewater treatment and resource recovery, discloses a printing and dyeing wastewater desizing water alkali recovery method, and solves the problem of low recovery treatment efficiency caused by serious membrane pollution when printing and dyeing desizing wastewater is treated by an existing membrane separation technology. The method comprises the following steps: carrying out homogenization and dissolved air flotation pretreatment on high-temperature desizing water to remove most of grease and suspended solids; then, clear liquid is filtered through an ultrafiltration membrane, a negative pressure environment is constructed on the membrane shell side to extract penetrating fluid in real time, meanwhile, fine bubbles are injected into feeding liquid to form gas-liquid two-phase flow, and the net pushing force of the membrane surface is controlled to be maintained in a 0.02-0.04 MPa micro-positive pressure interval so as to reduce membrane pollution; and carrying out nanofiltration purification on the primarily filtered water to finally obtain high-purity recovered alkali liquor. According to the invention, the problems of serious membrane pollution and fast flux attenuation in the traditional membrane treatment process are effectively solved, and efficient recovery of alkali and long-term stable operation of the system are realized.

A water recirculation system may be implemented to analyze and selectively recycle wastewater generated by the industrial fabric scrubber. In some examples, wastewater generated by an industrial fabric scrubber is subjected to various treatment processes, such as chemical treatment (e.g., addition of flocculants, chelants) and / or physical separation treatment (e.g., treatment in a dissolved air flotation system to remove particulates). This can produce clarified wastewater. One or more sensors can be positioned to measure characteristics of the clarified wastewater, such as the color of the clarified wastewater and the corresponding tendency to contaminate the textile if recycled to the scrubber. Based on measurements from the one or more sensors, the clarified wastewater can be recycled for reuse in the fabric scrubber, or alternatively discarded.

The utility model discloses a high-salt-content wastewater treatment system in the photovoltaic industry. The device comprises a strong brine inlet pipe, an adjusting tank, a first-stage silicon removal sedimentation tank, a hardness removal sedimentation tank, a first-stage dissolved air flotation device, a first-stage ultrafiltration membrane, a weak acid cation bed, a first-stage reverse osmosis membrane, a decarburization device, a second-stage silicon removal sedimentation tank, a second-stage dissolved air flotation device, a second-stage ultrafiltration membrane, a second-stage reverse osmosis membrane, a first-stage nanofiltration membrane, a second-stage nanofiltration membrane and a catalytic oxidation device. The pretreatment system has the advantages that product water treated by the pretreatment system for the high-salt-content wastewater in the photovoltaic industry is recycled for production, the treated strong brine is used as raw water for evaporative crystallization, and high-quality industrial byproduct salt is obtained after further concentration by the evaporation system, so that zero discharge of the wastewater is realized; meanwhile, the primary dissolved air flotation device, the secondary dissolved air flotation device, the hardness removal sedimentation tank and the silicon removal sedimentation tank are matched to perform floating and sedimentation treatment on suspended matters in the wastewater, so that the technical problems existing in sand filtration at present are solved.

The invention relates to the technical field of oily wastewater treatment, and discloses a rotational flow dissolved air flotation degreaser which comprises a degreasing assembly and a tank body, a liquid inlet pipe and a liquid outlet pipe are fixed on the tank body, a water weir plate is fixed on the inner wall of the tank body, an oil collecting barrel is arranged on the inner side of the water weir plate, and an oil weir plate is arranged at the top of the oil collecting barrel; the adjusting assembly is arranged on the oil weir plate and comprises an adjusting piece, and the adjusting piece comprises a supporting rod fixed to the top of the oil collecting barrel. The oil tank has the beneficial effects that when an oil layer in the tank body is thickened, the height of the oil weir plate can be reduced through the adjusting assembly, so that the oil layer can quickly cross the oil weir plate to enter the oil collecting barrel without being accumulated to the original thickness, and further the situation that the oil layer is too thick and is brought into a purified water area by rotational flow, and the oil content of a purified water outlet exceeds the standard is avoided; the height of the oil weir plate can be increased through the adjusting assembly, so that a large amount of purified water is prevented from crossing the weir plate along with the thin oil layer and entering the oil collecting cylinder to obviously increase the water content of discharged oil.

This utility model discloses an integrated device for treating leachate from a waste transfer station, comprising a pretreatment unit, a biochemical unit, and a sludge treatment unit. The pretreatment unit includes a wastewater collection tank, a homogenization tank, and a dissolved air flotation (DAF) tank. The biochemical unit includes an anaerobic preparation tank, an anaerobic reactor, a two-stage AO reactor, and a secondary sedimentation tank. The sludge treatment unit includes a sludge storage tank and a screw press dewatering machine. The wastewater collection tank, homogenization tank, DAF tank, anaerobic preparation tank, anaerobic reactor, two-stage AO reactor, secondary sedimentation tank, sludge storage tank, and screw press dewatering machine are sequentially connected via pipelines. This utility model achieves full-volume treatment of leachate from waste transfer stations, and has advantages such as significant treatment effect, no secondary pollution, low operating cost, low energy consumption, and saving land area.

This invention belongs to the field of multi-stage treatment of textile wastewater, specifically a high-efficiency and energy-saving textile wastewater treatment device. It includes an equalization tank with a wastewater pipe located at the rear end of the equalization tank. Two separation tanks are formed inside the equalization tank and connected by multiple connecting pipes. A rotating stirring platform is located at the bottom inner side of each separation tank, and multiple fan blades are fixed to the outer side of the stirring platform. A dissolved air flotation module is installed at the front end of the equalization tank. This design not only achieves multi-stage treatment of wastewater but also effectively adapts to the treatment process of multiple batches of different textile wastewater. It ensures that the pollution level of the wastewater injected into the treatment equipment is the same each time, allowing subsequent treatment devices to operate smoothly. Furthermore, it controls the wastewater discharge into subsequent equipment at a constant rate, reducing the problem of excessive load on the treatment device when the water volume is high.

The invention relates to the technical field of preparation of monopotassium phosphate, in particular to a process and a device for recovering an extracting agent from oily wastewater of a monopotassium phosphate device, and the device comprises rotational flow pretreatment equipment, pressurized dissolved air flotation equipment and extracting agent regeneration equipment; the rotational flow pretreatment equipment is provided with a feeding hole, a light phase outlet and a heavy phase outlet, and the heavy phase outlet is connected with the sedimentation tank; the pressurized dissolved air flotation equipment comprises a box body, and an air flotation contact area, an air flotation separation area and a clear water tank which are communicated in sequence are arranged in the box body; a light phase outlet of the cyclone pretreatment equipment and the extraction agent collecting tank are connected with an extraction agent recovery tank; the extraction agent recovery tank is connected with the extraction agent regeneration equipment; through a synergistic technical scheme of rotational flow pretreatment, micro-nano partial reflux pressurized dissolved air flotation and extractant regeneration, the core technical problems that alcohol and amine extractants in wastewater are difficult to emulsify and break, the recovery rate is low, the wastewater cannot be recycled and the energy consumption is high in the process of preparing refined phosphoric acid / monopotassium phosphate by an extraction method are precisely solved.

The utility model provides a kitchen slurry pretreatment system which comprises an adjusting tank, a communicated stacked screw filter press is arranged on one side of the adjusting tank, an efficient sedimentation tank, a cavitation air flotation machine and a dissolved air flotation machine which are communicated are sequentially arranged on one side of the stacked screw filter press, and a sludge temporary storage tank is arranged on one side of the stacked screw filter press. The efficient sedimentation tank, the cavitation air flotation machine and the dissolved air flotation machine are all communicated with the sludge temporary storage tank, and the sludge temporary storage tank is communicated with the stacked screw filter press. Kitchen slurry is firstly treated by the stacked screw filter press and the efficient sedimentation tank, so that the treatment effect of the cavitation air flotation machine and the dissolved air flotation machine can be improved, the air flotation machine is effectively prevented from being blocked, and the concentration of grease and suspended matters in pretreated effluent is greatly reduced. The cavitation air flotation machine is used for removing most small-specific-gravity suspended solids and grease in filtrate, and stable operation of the dissolved air flotation machine is ensured. And the dissolved air flotation machine is used for further removing residual small-specific-gravity suspended solids and grease to ensure the stability of a subsequent biochemical system.

The invention discloses a multi-effect demulsification treatment method and system for cold rolling oily wastewater, firstly, a multi-effect demulsification process of'acidification demulsification-neutralization flocculation 'is innovatively adopted, not only is acid-containing wastewater of a cold rolling pickling section or an acid regeneration section used as an acidic demulsifier to realize'treatment of waste by waste' and cost reduction, but also the treatment of waste by waste is realized through subsequent neutralization, aeration and flocculation, so that the treatment efficiency is improved. The demulsification efficiency is obviously improved. In addition, a grading air flotation strategy of cavitation air flotation and pressurized dissolved air flotation is adopted, so that thorough separation and excellent effluent quality are ensured. The cold rolling oily wastewater with different concentrations and compositions can be efficiently treated by accurately controlling key parameters such as pH, iron ion concentration and medicament adding amount. Finally, through the multi-effect synergistic effect, efficient demulsification and oil-water separation of different types of cold rolling oil-containing wastewater are achieved, the treatment efficiency is improved, the operation cost is reduced, stable effluent quality is ensured, and the oil removal rate of the cold rolling oil-containing wastewater can reach 92-99%.

The utility model discloses a dissolved air flotation type landfill leachate device which comprises a mixing tank, rotating shafts are rotatably arranged in the mixing tank and located on the upper side and the lower side, stirring blades are arranged on the outer walls of the rotating shafts and located in the mixing tank, one ends of the rotating shafts penetrate through the mixing tank and are provided with belt wheels, and the other ends of the rotating shafts penetrate through the mixing tank. A belt is arranged between the two belt wheels, a first motor is arranged on the outer wall of the mixing tank, the output end of the first motor is fixedly connected with the rotating shaft, a treatment tank is arranged on the outer wall of the mixing tank, and an overflow pipe is arranged at the upper end of the outer wall of the mixing tank; according to the device, the dosing hopper is arranged in the mixing tank, so that a user can add a flocculating agent into the mixing tank through the dosing hopper so as to make the flocculating agent contact with the landfill leachate, and meanwhile, a first motor is started to drive a rotating shaft to drive stirring blades to rotate, so that the effect of stirring the flocculating agent and the landfill leachate is achieved, impurities in the flocculating agent and the landfill leachate are more thoroughly condensed, and the device is convenient to use.

The present invention relates to a system and a method for recovering microfibres contained in a liquid effluent (L) from a textile treatment device. The system comprises at least one device (2, 4, 10, 20, 30, 5) for dissolving a gas directly in at least a portion of the liquid effluent (L) by means of pressurisation, and a device (5, 6, 7, 40, 50, 60, 61, 62) for separation by means of dissolved gas flotation, which are connected to one another. The device (5, 6, 7, 40, 50, 60, 61, 62) for separation by means of dissolved gas flotation further comprises means (60, 61, 62) for collecting the microfibres (MF) on the surface of the liquid effluent (L) contained in its enclosure (50).

The utility model relates to the technical field of chemical engineering, in particular to an air floatation oil removal system which comprises a dissolved air tank, an air floatation tank, a releaser, a tank inlet line, a tank outlet line and a purging line, and the dissolved air tank is arranged outside an air floatation oil removal device; the air floatation tank is arranged in the air floatation oil removal device; the releaser is arranged at the bottom of the air floatation tank; one end of the tank inlet line is connected to an inlet I of the dissolved air tank, the other end of the tank inlet line is connected to an industrial air pipe network, and a dissolved air tank hand valve is arranged on the tank inlet line; one end of the tank outlet line is connected to an outlet of the dissolved air tank, and the other end of the tank outlet line is connected to the releaser at the bottom of the air floatation tank. The releaser is prevented from being blocked by impurities such as sludge and rust, the releaser can be conveniently put into use next time, a manual disassembly and cleaning method is omitted, and the process that dissolved air flotation is quickly put into use is ensured.

The invention provides a pressurized dissolved air flotation process pressure stability detection system and a control method, and belongs to the technical field of water treatment. The system comprises a pressure acquisition module, a data transmission module, a control module, an execution module, an alarm module and a man-machine interaction module. High-precision pressure sensors are arranged at an outlet of a pressure pump, the interior of a dissolved air tank and an inlet of a dissolved air releaser, and pressure data of key nodes are collected in real time; the control module automatically analyzes the pressure state based on a preset stable interval, and is linked with a pressure pump frequency converter, a dissolved air tank exhaust / water replenishing valve and a releaser regulating valve to perform multi-stage regulation and control; and when the pressure exceeds the limit and triggers an emergency threshold value, the system automatically gives an alarm and executes protective shutdown. According to the invention, high-precision and real-time monitoring and rapid closed-loop control of pressure parameters are realized, the air dissolving efficiency and the pollutant removal rate are remarkably improved, the operation stability and safety of the system are enhanced, and the system is suitable for an air flotation treatment process under complex water quality conditions such as seawater desalination and industrial wastewater.

The utility model relates to the technical field of sewage treatment, and discloses a dissolved air flotation device for water treatment. Comprising a dissolved air flotation treatment pond, a side plate is fixedly connected to one side of the upper portion of the dissolved air flotation treatment pond, a conveying belt is arranged on one side of the side plate, and the sludge scraping assembly is arranged above the conveying belt and used for removing sludge floating on the surface of sewage. A sludge scraping plate in the sludge scraping assembly can be dismounted and mounted from a mounting plate, and the sludge scraping height in sewage can be adjusted, so that the sludge scraping plate can be conveniently maintained or replaced, the sludge cleaning practicability of the sludge scraping plate is improved, the cleaning assembly can clean the upper side and the lower side of the sludge scraping plate at the same time, and the cleaning efficiency is improved. Therefore, sludge residues on the sludge scraping plate can be effectively reduced, the sludge on the sludge scraping plate is prevented from being mixed in sewage again when rotating into the sewage, and the sewage treatment effect is improved.

The invention discloses a device and a process for producing biogas and returning biogas manure to fields through anaerobic fermentation of wool scouring wastewater, and belongs to the technical field of industrial wastewater treatment and resource utilization. The device comprises a pretreatment unit, a two-stage anaerobic fermentation unit, a biogas recycling unit and a biogas manure returning unit which are communicated in sequence, the pretreatment unit comprises a dissolved air flotation oil removal tank, a tempering acidification tank and a horizontal spiral centrifuge, the two-stage anaerobic fermentation unit comprises a hydrolysis acidification tank and an efficient internal circulation anaerobic reactor, and the biogas recycling unit comprises a biogas purification assembly and a waste heat utilization assembly. The biogas manure returning unit comprises a solid-liquid separation assembly, a compost maturing assembly and a precise irrigation assembly; according to the process, wool fat and suspended solids in wool scouring wastewater are removed through pretreatment, biogas is produced through two-stage anaerobic fermentation, the biogas is recycled after being purified, and biogas manure is prepared from anaerobic effluent and accurately returned to the field; the method realizes full resource utilization of the wool scouring wastewater, the COD removal rate is greater than or equal to 95%, the biogas yield is increased by more than 30%, secondary pollution is avoided, and the operation cost is low.

The application discloses a method and device for recovering phosphorus in waste water by using micro-bubble assisted struvite secondary crystallization, which comprises the following steps: firstly, primary crystallization of struvite is completed by using a static mixer to obtain struvite microcrystals, and conditions for secondary crystallization are created; and then, secondary crystallization of struvite is completed by using micro-bubbles generated by dissolved air flotation in a gas floating crystallizer, and finally, struvite crystallization products with controllable particle size and excellent sedimentation performance are obtained, and the recovery effect of phosphorus in waste water can be improved.

This utility model belongs to the field of dissolved air flotation (DAF) devices, specifically a scum scraping mechanism for a DAF device. It addresses the problems of existing scum scraping devices where the scraping depth is not adjustable, making it difficult to adjust the scraping depth according to the actual accumulation of scum, thus failing to completely remove scum and affecting effluent quality. Furthermore, if the scraping depth cannot be precisely controlled, the scum layer is easily disturbed excessively, causing some scum to re-mix into the water, reducing the flotation treatment effect. The proposed solution includes a DAF device body with a top frame welded to its top side, and a scum storage chamber inside the body. In use, this utility model allows the scraper plate to move up and down for adjustment, facilitating the adjustment of the scraping depth according to the actual accumulation of scum, thereby thoroughly removing scum. It also enables precise adjustment of the scraper plate, preventing excessive disturbance of the scum layer and the re-mixing of scum into the water.

The present invention relates to methods and devices for purifying industrial and natural water of iron, manganese and petroleum products by oxidation of the contaminants with ozone, followed by dissolved air flotation and filtration. The method and device according to the present invention provide for efficient purification of water, while minimizing the costs of carrying out the purification process and maintaining equipment.

The invention relates to the technical field of cold rolling wastewater recovery, in particular to a process method and device for quality-divided recycling of cold rolling wastewater. The invention provides a process method for recycling cold rolling wastewater according to quality, which comprises the following steps: screening out a plurality of first wastewater recycling point locations from cold rolling whole process drainage points on the basis of a judgment standard that the chemical oxygen demand is less than or equal to 60mg / L and the conductivity is less than or equal to 50mu s / cm, and carrying out precision filtration to form cleaning water; on the basis that the chemical oxygen demand is smaller than or equal to 60 mg / L and the electric conductivity is 50-500 [mu] s / cm, multiple second wastewater recovery point positions are screened out from cold rolling whole process drainage points, collected cold rolling wastewater is homogenized and subjected to dissolved air flotation oil removal and dirt removal to form oil-removed and sewage-removed water, part of the oil-removed and sewage-removed water is used for supplementing circulating water, and part of the oil-removed and sewage-removed water and municipal reclaimed water are subjected to combined deep treatment; and demineralized water is prepared through treatment by a filtering process. By implementing the technical scheme disclosed by the invention, low-cost and high-quality recycling of the cold rolling wastewater is realized, and energy consumption, sludge output and carbon emission of wastewater treatment and recycling are greatly reduced.

The application belongs to the technical field of air floaters, and particularly relates to a dissolved air floatation machine, which comprises a main box body, a medicine mixing mechanism, a gas dissolving tank, a water feeding pipe, a pump gas pipe, a water pump, a water return pipe, a shovel groove and a slag suction pipe. The medicine mixing mechanism is installed at the lower left part of the chamber of the main box body, the gas dissolving tank is installed outside the main box body, the input end of the water feeding pipe is inserted into the inside of the gas dissolving tank, the output end of the water feeding pipe is connected with the pump gas pipe, the pump gas pipe is installed at the bottom of the gas mixing area, the water suction pipe of the water pump is inserted into the middle part of the sedimentation area, the input end of the water return pipe is connected with one water outlet of the water pump, the output end of the water return pipe is inserted into the inside of the gas dissolving tank, the shovel groove is movably installed at the upper part of the chamber of the main box body, the left end of the shovel groove is inserted into the air floatation layer, the slag suction pipe is installed on the main box body, and the input end of the slag suction pipe is inserted between the shovel groove and the top wall of the main box body. The floating slag is gathered and shovelled out, so that the floating slag is prevented from being scattered and sinking, and the floating slag removal efficiency is improved.

The present invention discloses a pretreatment device and method for multiple types of wastewater, including chemical wastewater and oily wastewater. The pretreatment device comprises a sequentially connected storage tank assembly, a coagulation and flotation assembly, and a multi-component catalytic oxidation assembly. The storage tank assembly includes multiple wastewater storage tanks corresponding to each type of wastewater. The coagulation and flotation assembly includes an oil scraper and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified and dissolved substances using pressurized gas. The oil scraper is located above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater. The multi-component catalytic oxidation assembly includes a catalytic chamber containing multiple types of catalytic oxidation components. Organic pollutants in the multiple types of wastewater are degraded by the catalytic oxidation components within the catalytic chamber. Multiple types of wastewater are collected and treated separately, and the multiple types of catalytic oxidation components are used to rapidly degrade organic compounds, ensuring that the water quality at the outlet remains consistently up to standard.

The utility model relates to the technical field of air flotation deslagging, in particular to a self-adaptive deslagging air flotation device which comprises an air flotation tank and a deslagging structure, the deslagging structure is fixedly mounted above the air flotation tank and comprises a driving assembly, a foam scraping assembly and a deslagging assembly, the deslagging structure is fixedly mounted above the air flotation tank, and the driving assembly is fixedly mounted above the air flotation tank. A foam scraping assembly is fixedly mounted on the surface of the slag removal structure, a slag removal assembly is fixedly mounted on the surface of the driving assembly, and the driving assembly drives the foam scraping assembly to scrape foam and then makes contact with the slag removal assembly to generate elastic displacement to achieve self-cleaning slag removal. The problem that chippings and impurities are easily attached to an existing air floatation deslagging device in the scraping process and then enter an air floatation tank for the second time, and pollution is caused is solved.

The utility model provides a kind of electrolytic flocculation type dissolved air flotation sewage treatment all-in-one machine, it is related to adhesive production technical field, including shell, the outer surface left side bottom end of shell is inserted with sewage tank, the outer surface front section right side of shell is equipped with metal door, the outer surface middle part of metal door is equipped with observation port, the inside fixed mounting of sewage tank is equipped with mounting plate, AI edge calculation box, high-frequency pulse direct current power supply and cyclone dissolved air cavity are integrated into upper and lower layered structure, utilize upper baffle to separate electrical area and processing area, while using the integrated stamping process that sewage tank and cyclone dissolved air cavity share side wall, make equipment volume compared with traditional electrolysis-air flotation split device greatly reduce, venturi pneumatic refluxer is integrated with dissolved air cavity bottom, by 0.3-0.6MPa pressure difference self-driving operation, replace traditional electric reflux pump, further compress equipment size, effectively solve the problem of equipment volume in prior art too large.

1. The name of the design product: air floatation dissolved gas device. 2. The use of the design product: air floatation dissolved gas device is the core equipment of air floatation sewage treatment. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view 1. 5. The back of the design product is not easy to see or not visible during use, omit the rear view.

The invention provides a method and a system for treating MVR distilled oil sludge wastewater, and belongs to the technical field of oil sludge wastewater treatment. Comprising the following steps: sequentially carrying out pressurized dissolved air flotation treatment, extraction treatment, acidification treatment until the pH value is 3.0-3.5, electro-Fenton oxidation treatment, deep oxidation treatment, pH value adjustment to 7.0-8.5 and addition of a flocculating agent for precipitation separation, electrocatalytic oxidation treatment, gravity settling separation and microbial degradation treatment on the MVR steamed oil sludge wastewater. According to the method, the MVR distilled oil sludge wastewater is pretreated, and after sequential treatment of the pretreatment steps, the BOD5 / CODcr ratio of the wastewater is increased to 0.3 or above, so that the microbial biodegradability of the wastewater is fundamentally improved, and the method can be suitable for subsequent microbial degradation treatment. According to the invention, the overall decontamination effect of the wastewater treatment process is improved, the overall treatment cost of the wastewater is reduced, and the effluent at the tail end of the microbiological degradation treatment process can stably meet the discharge requirements of the national GB / T31962-2015 Urban Wastewater Nano Tube Limit.

The utility model belongs to the technical field of air floatation machines, and particularly discloses a double-reflux dissolved air floatation machine which comprises an air floatation machine body, a dissolved air water reflux pump, a dissolved air tank, a dissolved air releaser and an easily settled matter reflux pump, the air flotation machine body sequentially comprises a contact area, a separation area and a clear water area from the head end to the tail end; a water inlet is formed in the side wall of the bottom of the contact area; the contact area and the separation area share a wall, the separation area and the clear water area share a wall, and a dissolved air releaser is mounted at the bottom of the contact area and is communicated with a dissolved air tank; a first reflux inlet is formed in the bottom of the separation area, and the first reflux inlet is communicated with the water inlet through an easily settled object reflux pump; a second reflux inlet is formed in the bottom of the clear water area, and the second reflux inlet is communicated with the dissolved air tank through a dissolved air water reflux pump. The double-reflux dissolved air flotation machine is provided with the dissolved air water reflux pump and the easily settled matter reflux pump, and an uninterrupted double-reflux operation mode is used, so that the removal rate of particulate matters is improved, and the effluent quality of the air flotation machine is ensured.

The invention discloses a dissolved gas separation type jet flotation column which comprises a flotation column body, a jet cavitation device is installed in the flotation column body, a circulating pump and a pressurizing barrel are sequentially connected to a bottom outlet of the flotation column body in series, and the output end of the pressurizing barrel is connected with the liquid input end of the jet cavitation device; and bubbles with the diameter being 10-100 microns can be generated in ore pulp ejected by the jet flow type cavitation device, and bubbles with the diameter being 60-200 microns can be generated in ore pulp output from the interior of the pressurizing barrel. The circulation loop combines two bubble forming mechanisms of'dissolved gas precipitation 'and'cavitation shearing', multi-scale bubble combination is achieved, small-size bubbles improve the collision probability with fine particles, large-size bubbles provide enough buoyancy to carry the particles to float upwards, capture and secondary mineralization efficiency of the fine particles is synergistically enhanced, and the micro-particle capturing and secondary mineralization efficiency is improved. The defects that single small-size bubbles are insufficient in buoyancy and difficult to secondarily mineralize are effectively overcome, and the problem that single large-size bubbles are low in micro-fine particle capturing probability is solved.