157 results about "Dissolved air flotation" patented technology

The invention belongs to the technical field of sewage treatment, particularly relates to laboratory efficient dissolved air flotation sewage treatment equipment and a use method thereof, and provides the following scheme aiming at the problems that scum cannot be effectively scraped by a scraper blade when the existing liquid level surface is relatively low, and a flocculating agent added in the later period is accumulated at the top of the scum: the laboratory efficient dissolved air flotation sewage treatment equipment comprises an air flotation box, a sewage liquid inlet pipe is arranged on one side of the air flotation box and used for injecting sewage, a sewage discharge pipe is arranged at one end of the air flotation box and used for discharging treated sewage, a scum discharge port used for discharging scum is formed in one end of the air flotation box and located above the sewage discharge pipe, a collecting box located below the scum discharge port is fixed to one end of the air flotation box, and a water outlet is formed in the other end of the air flotation box. According to the device, through cooperation of the air outlet cylinder, the nozzle and the scum discharging plate, the scum can be automatically gathered towards one side and discharged from salvage, scum removal is effectively completed, a flocculating agent can be automatically injected after scum removal, the flocculating agent is prevented from being accumulated on the scum, and the later sewage treatment efficiency is guaranteed.

The utility model discloses a dissolved air flotation scum scraping device, which belongs to the field of wastewater treatment equipment and comprises an air flotation tank and scum scraping equipment. The air floatation tank is provided with a collecting tank along the radial direction, and one side of the collecting tank is provided with a slope. The scum scraping equipment comprises a scraping arm and a scraping plate, the scraping arm is arranged in the radial direction of the air floatation tank and can circumferentially rotate towards the slope direction around the air floatation tank, the top of the scraping plate is hinged to the scraping arm, and a concave area is formed in the side, pushing scum, of the scraping plate. The scraping plate can rotate relative to the slope through the hinged structure of the scraping plate and the scraping arm, and large interference and resistance cannot be generated between the scraping plate and the slope. And after the scraper rotates, the scum in the concave area can be automatically poured into the collecting tank to be discharged. And the concave area of the scraper can enhance the collection and storage effects of the scum when the scraper revolves. After a large amount of scum is stored in the inner concave area, when the scraping plate is in contact with the slope, the reverse thrust of the scum on the scraping plate is reduced, the scum amount pushed in a single time is increased, and then the scum discharging efficiency is improved.

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 utility model provides a high-efficiency dissolved air flotation device which is characterized in that an air dissolving tank body and an air flotation box are arranged at the upper end of a base, and the bottom of the air dissolving tank body is communicated with the air flotation box at the bottom end part of the air flotation box through a plurality of groups of ejection pipes; a water level sensor used for detecting the upper liquid level in the box is arranged in the air floatation box, and an impurity scraping assembly, an impurity removing assembly and a stirring assembly are further arranged in the air floatation box; the impurity scraping assembly is used for cleaning impurities in the box through an impurity scraping plate; the impurity removing assembly is used for removing impurities on the right side plate face of the impurity scraping plate through a pair of impurity removing plates. In the stirring assembly, stirring blades are arranged at the bottom end of an electric telescopic rod, are suspended in the air floating box, and are driven by a stirring driving mechanism to rotate. According to the utility model, the manufacturing cost can be reduced while gas-liquid mixing and pressurizing are realized, the device is not easy to block and has a certain self-cleaning function, and the aim of improving the impurity removal efficiency while the sewage treatment efficiency is not influenced is fulfilled.

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.

The utility model discloses dissolved air flotation deslagging equipment which comprises a dissolved air flotation machine, a sludge tank is arranged in the dissolved air flotation machine, and a blanking hopper is fixedly mounted at an opening in the top of the sludge tank; one side of the outer surface of the dissolved air flotation machine is fixedly connected with a deslagging shell, the deslagging shell is communicated with the sludge tank, and one side of the outer surface of the deslagging shell is fixedly provided with a shell; and a motor is fixedly mounted on one side of the outer surface of the shell. According to the utility model, through the arrangement of the blanking hopper, the deslagging shell, the shell, the motor, the large synchronous belt wheel, the small synchronous belt wheel, the synchronous belt, the rotating shaft, the reciprocating assembly, the roller, the strip-shaped filter screen and the knocking assembly, after dross enters the sludge tank, solid-liquid separation is carried out through the strip-shaped filter screen, the separated dross is automatically discharged, time and labor are saved, and the operation is convenient. And the knocking assembly can be used for removing residues of the strip-shaped filter screen after the dross is discharged, so that the cleaning effect on the strip-shaped filter screen is ensured.

The invention discloses a dissolved air flotation algae removal and residue suction system which comprises a filter tank, a dissolved air flotation device for enabling impurities to float to the water surface through air and a residue suction device for collecting floating objects on the water surface. The dissolved air flotation device comprises a dissolved air tank used for mixing water with compressed air to form dissolved air water; the air compressor is used for pressurizing air and then conveying the pressurized air to the dissolved air tank; the reflux pump is used for conveying part of settled water into the dissolved air tank; the dissolved air releaser is communicated with the dissolved air tank, is arranged in the filter tank and is used for diffusing the dissolved air water in the filter tank; the scum collector is arranged in the filter tank, and a scum suction port of the scum collector is positioned below the liquid level; and the vacuum suction device enables the scum collector to form negative pressure so as to absorb the scum on the liquid level of the filter tank, and conveys the scum to the sludge discharge tank. The device has the effect of stabilizing the water quality before filtration.

An inventive system and method for treatment of contaminated produced water from fracking operations. The inventive system includes a filtration unit, an electrolysis unit, and a cavitation unit. The filtration unit may comprise mesh filtration units or reverse osmosis filtration units. The electrolysis unit may include alternative anode and cathode plates, where the anode plates have a mixed metal oxide coating. Each of the filtration, electrolysis, and cavitation units preferably comprise two or more of each arranged in parallel, such that each can be operated independently without stopping the operation of the entire system. The system and method may further include separation tanks and / or dissolved air flotation tanks—either before or after the electrolysis unit or cavitation unit processing.

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 utility model discloses a treatment system for mine water polluted by emulsion. The device comprises a regulating tank, a coagulative precipitation tank, a filter system, a sludge concentration tank, a primary dissolved air flotation system, a secondary dissolved air flotation system and a biochemical system, a water quality monitoring device and a PLC (programmable logic controller) are arranged on an output pipeline of the filter system, and a first branch pipeline is provided with a first valve; the second branch pipeline is provided with a second valve; the water quality monitoring device is connected with the PLC, and the first valve and the second valve are connected with the PLC; a water quality monitoring device and a PLC (Programmable Logic Controller) are arranged on an output pipeline of the primary dissolved air flotation system; a third valve is arranged on a third branch pipeline; the water quality monitoring device is connected with the PLC, the third valve and the fourth valve are connected with the PLC, the enriched liquid output pipelines of the two dissolved air flotation systems are connected with the solution collecting tank, and the biochemical system is connected with the solution collecting tank. The mine water purification device can effectively remove emulsified liquid while purifying mine water.

The utility model discloses anaerobic fermentation residue solid-liquid separation equipment based on a dissolved air flotation technology, which relates to the technical field of anaerobic fermentation residue utilization and treatment, and comprises a spiral extrusion device and an air flotation device, the spiral extrusion device is used for carrying out solid-liquid separation on anaerobic fermentation residues, and the air flotation device is used for carrying out air flotation on the anaerobic fermentation residues. A bubble generating device is arranged in an air flotation tank of the air flotation device and is used for generating bubbles, and a water outlet of the spiral extrusion device is communicated with a water inlet of the air flotation device, so that liquid in anaerobic fermentation residues is mixed with the bubbles, and the bubbles are mixed with the liquid in the anaerobic fermentation residues; air bubbles are arranged in the air floatation tank, the air bubbles are attached to suspended matter particles in the liquid to drive the suspended matter particles to float upwards, and a slag scraper is arranged above the air floatation tank and used for scraping the suspended matter particles in the air floatation tank into a slag discharging tank of the air floatation tank. According to the utility model, the solid-liquid separation rate of biogas slurry and biogas residue is improved.

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 utility model relates to the technical field of sewage treatment, in particular to ceramic membrane filtration equipment which comprises a filter tank, a pretreatment tank and a sludge storage tank, sliding holes are formed in the top ends of the two sides of the pretreatment tank, and a servo motor is mounted at one end of each sliding hole through a mounting seat; an output shaft of the servo motor is connected with a screw rod through a coupler, the screw rod is sleeved with a screw block, the inner side of the screw block is connected with a scraping plate through a sliding rod, and one end of the pretreatment pool is provided with an air pump through a mounting base; a rectangular exhaust pipe disc is arranged at the bottom in the pretreatment tank and is communicated with an air pump through an air inlet main pipe; a sludge storage tank is mounted at the other end of the pretreatment tank through bolts; the ceramic membrane filtration equipment can remove sludge in advance through a dissolved air flotation sludge discharge system, so that the ceramic membrane is prevented from being blocked, the use effect is improved, stage treatment is realized, and the sewage treatment and purification efficiency is improved.

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 belongs to the technical field of polyglutamic acid extraction processes, and particularly relates to an extraction method for fermenting polyglutamic acid based on glutamic acid isoelectric crystallization mother liquor. According to the method, polyglutamic acid fermentation liquor based on glutamic acid isoelectric crystallization mother liquor is used as a raw material, on the basis of a graded salting-out extraction method, flocculants such as sodium polyacrylate are added, the flocculation capacity of polyglutamic acid is improved, cationic surfactants such as hexadecyl trimethyl ammonium chloride are added, the viscosity of a polyglutamic acid salting-out product is reduced, and the polyglutamic acid isoelectric crystallization mother liquor is obtained. And the polyglutamic acid is collected by using a pressurized dissolved air flotation technology, so that the loss in the polyglutamic acid extraction process is greatly reduced, and the bubble amount in the polyglutamic acid product is increased, thereby achieving the purposes of simplifying the polyglutamic acid extraction process, improving the extraction yield and reducing the drying energy consumption. The method is novel in process route and large in industrialization potential, and full-water-phase extraction of polyglutamic acid can be achieved.

The utility model relates to a dissolved air flotation device, which belongs to the technical field of industrial sewage treatment and comprises a base, a machine body fixed at the top of the base, a sewage treatment mechanism mounted at the top of the base and used for treating industrial oily sewage, and a sewage discharge component mounted at the top of the base and used for cleaning impurities deposited in the machine body, the sewage treatment mechanism comprises a gas dissolving assembly which is mounted at the top of the base and is used for providing gas-dissolved water, and a mixing assembly which is mounted in the machine body and is used for improving the reaction efficiency between the gas-dissolved water and the oily sewage. According to the dissolved air flotation device, oil-containing industrial sewage and air-dissolved water can be fully stirred, so that the contact area between the oil-containing industrial sewage and the air-dissolved water can be effectively increased, the effect of improving the air-dissolved air flotation treatment of the air-dissolved water on the oil-containing industrial sewage is achieved, the treatment efficiency of the oil-containing industrial sewage is improved, and the treatment cost of the oil-containing industrial sewage is reduced. And moreover, the dissolved air flotation device is not influenced by the discharge amount of oil-containing industrial sewage, and the practicability of the dissolved air flotation device is improved.

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.