13 results about "Dissolved air flotation" patented technology

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 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 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.

The present application relates to a kind of high-efficiency dissolved air flotation sewage treatment equipment, it relates to the technical field of sewage treatment, it includes box, slagging mechanism, sludge discharge mechanism, water outlet pipe and water inlet pipe, slagging mechanism includes first motor, transmission chain, transmission wheel, mounting seat and scraper, multiple transmission wheels are rotatably installed on the box, transmission rod is fixedly installed between opposite two transmission wheels, first motor is fixedly installed on the upper end of the box, the output shaft of first motor is drivingly connected with one of transmission wheel, transmission chain is sleeved on transmission wheel, multiple mounting seats are fixedly installed on transmission chain, the two ends of mounting seat are each fixedly connected with one transmission chain, scraper is fixedly installed on mounting seat, the end of box close to first motor is fixedly installed with slag collection box, slag collection box one side is fixedly installed with slag collection inclined platform.The present application can realize reverse scraping dross, improve water purification efficiency simultaneously.

This invention relates to a treatment system and method for wastewater containing high salt content and high concentration of recalcitrant organic matter, belonging to the field of wastewater treatment technology. It solves the problems of evaporator coking and high treatment costs for hazardous wastewater containing high salt content and high concentration of recalcitrant organic matter in existing methods. The treatment system includes: a dissolved air flotation tank, a comprehensive equalization tank, a biological selection tank, an anoxic tank, a first MBBR tank, a secondary sedimentation tank, a first air flotation filter, an advanced oxidation tank, a second MBBR tank, and a second air flotation filter, arranged sequentially along the material flow direction; it also includes an ozone pretreatment reverse osmosis brine device, the outlet of which is connected to the inlet of the comprehensive equalization tank. This achieves efficient, stable, reliable, and economical treatment of wastewater containing high salt content and high concentration of recalcitrant organic matter.

This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for industrial parks used to reduce pollutant emissions. The system includes an industrial wastewater treatment device and a domestic wastewater treatment device. The industrial wastewater treatment device includes, in sequence, an underground buffer tank, a demulsification reaction tank, a paper tape oil separator, a wastewater collection tank, a physicochemical flat-plate biological bed, a first dissolved air flotation tank, and a first sludge tank. The domestic wastewater treatment device includes, in sequence, a bar screen, an equalization tank, a domestic flat-plate biological bed, a second dissolved air flotation tank, and a second sludge tank. The first and second dissolved air flotation tanks are connected via pipelines and output as treated wastewater that meets emission standards. This system separates industrial and domestic wastewater treatment, specifically by converting the original MBR membrane tank into a flat-plate biological bed and the primary treatment tank into a flat-plate biological bed. Carbon removal / nitrification reactions are achieved through the biofilm carrier (packing material), improving the efficiency of organic matter degradation and reducing the COD, ammonia nitrogen, and sludge volume in the effluent.

The utility model discloses a kind of dissolved air flotation machines, including body, separation zone is provided in the body, the separation zone upper portion is provided with slag scraping device, the slag scraping device includes conveying chain, slag scraping motor, transmission, slag scraping plate, plate cleaning device, the conveying chain is installed with body by shaft and bearing seat, the slag scraping motor is fixed with body top, transmission is driven with conveying chain by transmission, the conveying chain is installed with multiple slag scraping plates, plate cleaning device is installed on the body at the tail end of the separation zone. The utility model is cleaned to the surface of the slag scraping plate passed by plate cleaning device at the tail end of the separation zone, and the scum and impurities on the slag scraping plate are scraped to the tail of the separation zone, it is convenient to push into pollution area after next time slag scraping plate passes, so that the scum and impurities of reciprocating slag scraping plate return to the initial end of the separation zone again and keep clean, increase the cleaning efficiency of scum and impurities, also avoid the return of impurities and increase the sediment accumulation phenomenon.

The utility model relates to dissolved air flotation technical field discloses a coagulation dissolved air flotation device, including the bottom plate, the bottom plate top fixedly connected with the air float box, the air float box inner wall both sides are rotatably connected with the stirring rod, the stirring rod outer wall is fixedly connected with a plurality of stirring vane, a plurality of air jets are fixedly connected with the stirring vane top, the air float box bottom end both sides are fixedly connected with the support frame, the support frame inner wall rear side is fixedly connected with the pipe head. In the utility model, the stirring vane and air jet are driven to rotate through the stirring rod, the sewage is stirred, the air pump is started simultaneously, the air pump supplies the gas to the pipe head through the connecting pipe and the shunt pipe, the gas enters the stirring rod through the pipe head, and finally is sprayed through the air jet, forms the micro air bubble, and the micro air bubble combines with the suspended solids and pollutants in the sewage, makes it float to the water surface, can more fully contact with the suspended solids and pollutants in the sewage, improves the sewage treatment efficiency.

This utility model discloses an integrated dissolved air flotation (DAF) tank structure for treating oily wastewater, relating to the field of wastewater treatment technology. The utility model includes a DAF tank with a baffle fixedly connected to its top and a pressure dissolved air tank on its left side. It also includes a sludge scraping mechanism located inside the DAF tank, comprising a conveyor seat fixedly connected to the top of the DAF tank, a conveyor belt inside the conveyor seat, and several scrapers on the outer surface of the conveyor belt; and a vibration mechanism located on the inner top of the baffle. By incorporating the vibration mechanism, specifically, the scrapers collide with and vibrate against a collision block during movement, causing the sludge adhering to the scrapers to be shaken off, significantly reducing residue. The vibration also pushes the collision block, allowing the scrapers to move away smoothly. This repetitive motion achieves a self-cleaning effect, eliminating the need for frequent cleaning by personnel.

This invention belongs to the field of oil and gas field wastewater treatment, and specifically relates to a shale gas fracturing flowback wastewater treatment system and method, including treatment units such as equalization and homogenization, dissolved air flotation, multi-stage chemical sedimentation, coagulation separation, electrochemical catalytic oxidation, membrane treatment, and magnetron evaporation crystallization. The dissolved air flotation unit generates micro-nano bubbles through a Venturi-cyclone coupling device, achieving efficient flotation in conjunction with PAC / PAM; the multi-stage sedimentation tank adds softening agents in stages and implements closed-loop control to remove soluble barium, boron, fluorides, and hardness; the electrochemical oxidation unit enhances mass transfer through ultrasound to degrade recalcitrant organic matter; the membrane treatment uses an integrated system of hollow fiber membrane bioreactor, spiral wound ultrafiltration membrane, and antifouling reverse osmosis membrane to achieve compliant wastewater discharge; the magnetron evaporation crystallizer utilizes the synergistic regulation of magnetic field gradient and temperature gradient to control the crystallization process, achieving membrane separation and fractional treatment of concentrated brine to produce high-purity salt products. This invention can effectively achieve the standard discharge treatment of shale gas fracturing backflow wastewater and the resource utilization of evaporated crystallized salt. It is also applicable to the treatment of shale gas production wastewater with similar water quality characteristics, and has good prospects for promotion and application.

The utility model provides a kind of water treatment system for adjusting coal gas water pH by carbon dioxide, including oil separation tank, adjusting pool, dissolved air flotation machine and dross tank, the water inlet of oil separation tank is connected with coal gas water inlet pipe, the water outlet of oil separation tank is connected with the water inlet of adjusting pool, the water outlet of adjusting pool is connected with the water inlet of dissolved air flotation machine, the water outlet of dissolved air flotation machine is connected with the import of hydrolytic acidification pool, and the dreg outlet of dissolved air flotation machine is connected with the import of dross tank;Micro-porous aerator is equipped in adjusting pool, the air inlet of micro-porous aerator is connected with carbon dioxide pipe, and adjusting valve is installed on carbon dioxide pipe;pH detector is installed in adjusting pool, and oxygen concentration analyzer is installed outside adjusting pool. By carbon dioxide adjusting wastewater pH, replace sulfuric acid dosing to adjust pH, reduce the content of sulfate in wastewater, reduce the addition amount of soda in rear-end hardening system, reduce soda consumption, improve economic benefit.

This utility model discloses a novel combined system for seawater desalination pretreatment, comprising a regulating reservoir and an intake pumping station. The system includes a dissolved air flotation (DAF) unit with sand removal function, an ultrafiltration unit, and an ultrafiltration permeate tank, sequentially arranged at the rear end of the intake pumping station. By organically combining the novel DAF process with sand removal function with submerged ultrafiltration, the traditional complex pretreatment process is replaced, significantly reducing the process flow and the number of equipment. The DAF return water uses submerged ultrafiltration permeate, effectively avoiding clogging of the air release head and ensuring stable operation of the DAF unit. The ultrafiltration backwash water is returned to the DAF front-end treatment, realizing water resource recycling, reducing environmental impact, and improving the overall system stability. The combined process fully leverages the sand removal and suspended solids separation advantages of DAF, as well as the high-precision filtration capability of submerged ultrafiltration, to stably produce high-quality pretreated water, providing a reliable feedwater guarantee for subsequent seawater desalination processes.

This invention belongs to the field of dissolved air flotation, specifically a microbubble dissolved air flotation device. Addressing the problems of existing devices failing to efficiently generate a large number of nanoscale microbubbles, and the resulting bubbles having short residence times in water and relatively low surface loading, leading to low adhesion efficiency of suspended solids and affecting turbidity removal efficiency and purification effect, the following solution is proposed. It includes a tank body, within which a stirring mechanism is installed in the reaction zone to agitate the water and aid flocculation. A dissolved air assembly is installed within the dissolved air tank body to generate microbubbles that adhere to suspended solids in the flocculated water within the dissolved air tank. In this invention, the dissolved air assembly efficiently generates a large number of nanoscale microbubbles. These microbubbles have longer residence times in water, higher surface loading, and can quickly adhere to the flocculated suspended solids, promoting their flotation and separation, thereby significantly improving the turbidity removal efficiency and purification effect of water treatment.