71 results about "Sand filter" patented technology

This utility model discloses an oxygen denitrification treatment device for aquaculture water, including a treatment tank. The treatment tank is equipped with a filtration zone, an aerobic biological zone, an anoxic biological zone, and a degassing zone. The filtration zone is filled with quartz sand filter media. The aerobic biological zone contains biological packing material and has a jet aeration ring on its outer wall, which is connected to an ozone-oxygen mixture generator. The anoxic biological zone is filled with porous ceramsite packing material. The degassing zone has a guide plate inside. In this utility model, the aquaculture water can be filtered for suspended particulate matter through the quartz sand filter media. The jet aeration ring can introduce ozone-oxygen mixture gas, which, together with the honeycomb biological packing material, can complete ammonia nitrogen oxidation. The denitrifying bacteria on the surface of the porous ceramsite packing material can convert nitrates into nitrogen gas. Finally, the gas is separated by the guide plate, and the purified water can be discharged from the outlet. Thus, through the above structure, efficient denitrification, oxygenation, and purification of aquaculture water can be achieved, improving water quality treatment efficiency and stability.

This utility model relates to the field of sand filter cleaning technology and provides a V-type sand filter ultrasonic rotary spray device, comprising: a sand filter body; an ultrasonic generator installed on the outer wall of the other side of the sand filter body; ultrasonic transducers uniformly fixedly installed on the inner wall above the filter media tank; a spray mechanism movably installed at the top of the fixed pipe and branch pipe; and a protective filter screen uniformly installed at the top of the spray mechanism. The V-type sand filter ultrasonic rotary spray device provided by this solution utilizes the operation of the ultrasonic generator to cause multiple ultrasonic transducers on the upper layer of the filter media in the filter media tank to generate ultrasonic vibrations, performing ultrasonic cleaning on the upper layer of filter media. This is combined with the main nozzle and inclined nozzle rotating to spray and rinse, and then with the operation of a second water pump to draw water into the water supply pipe. The water flowing through the water supply pipe enters multiple connecting pipes and is then sprayed out through multiple flushing heads to rinse and remove contaminants, achieving efficient rinsing of the filter media above the filter media tank.

The present application relates to the technical field of deep-sea resource development, and specifically relates to a deep-sea low-disturbance mining robot control system, comprising: an information perception module for acquiring and transmitting multi-source sensing data; a central control module for receiving and processing the multi-source sensing data to generate coordinated control instructions; a motion and attitude adjustment module for receiving the coordinated control instructions to drive a piston-type variable buoyancy tank and walking feet to execute actions, and to adjust the overall buoyancy, attitude and walking state of the robot; a collection and storage and transportation operation module for receiving the coordinated control instructions to drive a suction mechanical arm and a mineral storage and transportation box to execute actions, and to collect and transport minerals. The present application improves the walking stability and operation adaptability of the robot in complex terrain, effectively prevents subsidence and attitude instability, combines a sand filtering structure and dynamic buoyancy compensation, reduces disturbance to seabed sediments, reduces turbidity current diffusion, and has environmental friendliness, and can perform long-term, continuous and stable high-efficiency mining operations in deep sea.

An iron bucket plastic bucket hazardous waste resourceization sewage treatment system based on segmented oxidation and dynamic regulation, strong alkali wastewater enters the first artificial grid, the first oil separation tank, the strong alkali water adjusting tank, the PH adjusting tank, the demulsification tank, the first coagulation sedimentation tank, the sand filter and the reuse water tank in sequence through the water inlet; the comprehensive wastewater enters the physical and chemical pretreatment unit, the hydrolysis acidification tank, the nutrition tank dosing tank, the anaerobic UASB tank, the AO biochemical tank, the secondary sedimentation tank, the Fenton advanced oxidation unit and the biological aerated filter in sequence through the water inlet, the sludge inlets of the first coagulation sedimentation tank, the anaerobic UASB tank, the secondary sedimentation tank and the Fenton advanced oxidation unit are connected with the sludge tank inlet in sequence, the utility model discloses scientific and reasonable design, multi-mode switchable process flow, 18% lower than traditional process, energy consumption reduces 25% at low load; effectively reduce the water treatment cost of 0.8-1.2 yuan per ton, and the social and economic benefits are remarkable.

The utility model relates to an aluminum shell cleaning wastewater recycling treatment system, including cleaning machine pure water tank, quartz sand filter vat, activated carbon filter vat, heating water tank, cleaning machine cleaning tank, sewage collection pond and filter water bucket, the output of cleaning machine pure water tank is connected sewage collection pond, and the top one side of cleaning machine pure water tank is provided with overflow sewage outlet, and the slightly contaminated water of cleaning machine is collected to sewage collection pond through overflow sewage outlet, the output of sewage collection pond is connected quartz sand filter vat, and the output of quartz sand filter vat is connected with activated carbon filter vat, and activated carbon filter vat is connected filter water bucket through pipeline, filter water bucket connects heating water tank, and heating water tank is connected cleaning machine cleaning tank through pipeline, and the on -line detection instrument of PH value is set up on cleaning machine cleaning tank, the utility model can solve the pressure of sewage treatment, reduce the production cost of enterprise, make the cleaning of sewage only need simple processing to use, simple operation can greatly improve production efficiency.

The application discloses a denitrification and dephosphorization method based on sand filtration in-situ optimization, which comprises the following steps: (1) mixing green algae obtained by centrifugal treatment of green algae bacteria liquid with sodium alginate solution to obtain a sodium alginate green algae mixed solution; and preparing a metal cation solution; (2) pouring the sodium alginate green algae mixed solution into a sand filter tank filled with sand filter fillers in 1-2 times; then pouring the metal cation solution into the sand filter tank in 1-2 times, and solidifying to obtain modified sand filter fillers wrapped with microbial hydrogel; (3) feeding sewage to be treated into the sand filter tank for denitrification and dephosphorization purification; and (4) after the sand filter tank is operated for 15-30 days, discharging sewage in the sand filter tank, and repeating steps (1)-(3). The cross-linking reaction of sodium alginate and metal cations forms hydrogel, the green algae is fixed on the outer layer of quartz sand, and microbial hydrogel is formed, so that the erosion and wear of quartz sand in the filtration process can be protected, and the denitrification and dephosphorization effect is improved.

The application discloses a scouring protection and active repair device for offshore wind power large-diameter single-pile foundation, relates to the technical field of offshore single-pile wind turbine foundation protection, and comprises a sand filtering and flow disturbing assembly and a scouring pit repair assembly, the sand filtering and flow disturbing assembly is arranged around the single-pile foundation to intercept and collect silt carried by sea current; wherein the scouring pit repair assembly comprises a lifting ring, a connecting rod and a silt scraping plate, the lifting ring is arranged on the outer wall of the single-pile foundation in a lifting and rotating mode, the silt scraping plate is connected with the lifting ring through the connecting rod, and the silt scraping plate pushes the silt collected by the sand filtering and flow disturbing assembly into the scouring pit under the driving of the lifting ring; and the application further comprises a monitoring assembly for monitoring the formation of the scouring pit around the single-pile foundation. The application integrates real-time monitoring, active repair and self-power supply functions, realizes sand filtering and flow disturbing, lifting and rotating silt scraping cooperative operation, accurately fills and resets the scouring pit, effectively inhibits the development of scouring, and significantly improves the safety and service life of the pile foundation.

The utility model provides live fresh storehouse circulation ecological system, and the water after biochemical module processing flows through post sand filter tank, disinfection module and light reaction module in proper order. Post sand filter tank is responsible for filtering off suspended particles and other impurities in water, further improves the purity of water quality, disinfection module carries out sterilization treatment to water body, effectively kills the residual harmful microorganism, ensures the safety of water quality, and water body enters light reaction module, in light reaction module, algae carries out photosynthesis under the light condition, utilizes carbon dioxide and nutrient salt in water to grow and breed, and the seawater after this series of processing is transported to the temporary breeding system, provides a clean, healthy and rich algal bait growth environment for live fresh, thereby effectively solve traditional temporary breeding system in water quality is easy to be contaminated, algal bait supply is not stable and disinfection maintenance is not convenient and so on problem, greatly improves the survival rate and growth efficiency of temporary breeding organism.

The present application relates to water pollution treatment technical field, disclose the present application discloses a kind of V filter tank for sewage treatment, including multiple filter tank main body, water inlet groove, biological filter layer, quartz sand filter material layer, supporting layer, filter plate and water outlet groove are sequentially arranged from top to bottom in each filter tank main body;Biological filter layer includes installation frame and multiple layers of sliding frames arranged in installation frame along horizontal direction, each layer of sliding frame is separated into multiple through slots by partition, biological filler is fixed in through slot, heating wire is arranged in the inside of partition, iron block is arranged on sliding frame, electromagnet and spring are correspondingly arranged on installation frame;When the temperature of water inlet is lower than the set threshold, heating wire is powered to heat, electromagnet is powered to make multiple layers of sliding frames staggered, and the water flow channel is changed from vertical straight path to zigzag path.The present application can quickly improve water temperature and prolong contact time under low temperature condition, guarantee the metabolic activity of denitrifying bacteria, and realize stable denitrification effect.

The application relates to the technical field of bolt processing, in particular to a wastewater recycling treatment equipment for bolt processing, which comprises a sand filter tank, a filtering cavity, a material taking cavity and a feeding cavity are separated in the sand filter tank, a plurality of through material conveying holes are arranged in an array between the material taking cavity and the feeding cavity, a material taking plate and a feeding plate are rotationally connected in the sand filter tank, two symmetrical material taking grooves are arranged on the top of the material taking plate, a feeding groove is arranged on the top of the feeding plate, two symmetrical electric telescopic rods are fixedly installed on the bottom of the feeding groove, a movable plate is fixedly installed between the top telescopic ends of the two electric telescopic rods, a stirring motor is fixedly installed in the sand filter tank, and a rotating drum is fixedly installed on the output end of the stirring motor. The device can clean the top filter material which has the greatest influence on the filtering cavity in sequence without interrupting the filtering operation, and the filtering effect of the device is improved to a certain extent.

This invention relates to the field of kitchen waste pretreatment, and particularly to a kitchen waste pretreatment device for a residential waste transfer station. It includes a pusher box, one end of which is equipped with a recycling auxiliary component, and the other end is connected to a biological deodorization box. In this invention, the rise in water level within the treatment chamber causes floating debris to rise. At this time, the output end of the condenser structure on the sliding tube and the input end of the cold air pipe are at the same height, causing grease and floating debris to rise to the water surface. The condenser structure is activated, and cold air is introduced into the treatment chamber through the cold air pipe. The cold air naturally descends, causing grease to begin to accumulate and condense. Then, a fourth electric pusher is activated to push the oil-absorbing pad to adsorb the condensed grease and debris. Subsequently, during drainage, residual grease is adsorbed through a quartz sand filter layer. The buoyancy enhances the adsorption effect of grease and floating debris, thereby improving the pretreatment effect of kitchen waste.

The application discloses a wind-sand environment simulation experiment table and application thereof, and relates to the technical field of wind-sand environment simulation experiments, and comprises a box body, the box body is provided with a transparent cover, the transparent cover covers half of the shell of the box body, sand filter screens are screw-connected to the front end and the rear end of the box body, and circular sand filter screens are fixedly connected to the middle portions of the sand filter screens. The wind-sand environment simulation experiment table and application thereof automatically guide the sand in the sand tank to the small magnetic valve pipe and the large magnetic valve pipe, ensure that the wind-sand assembly can continuously output the sand from the magnetic valve pipe structure under the condition of sand, and avoid the interruption phenomenon, so that the sand can be finally completely drained from the sand tank, sand particle residues are avoided, the problem of manually cleaning the sand particles in the sand tank is avoided, and the accurate statistics and collection of the total amount of sand changes in the wind-sand environment simulation experiment are facilitated.

The utility model discloses a device of fluorine -containing wastewater advanced defluorination, include: pretreatment box, the pretreatment box outside fixedly connected with first water pump, first water pump side fixedly connected with reaction box, reaction box outside fixedly connected with second water pump, the water outlet one side of second water pump fixedly connected with adsorption tower, adsorption tower bottom fixedly connected with drainage pump, the utility model discloses in pretreatment box adopts the ladder -type physical interception of oblique grid grating and coarse filter assembly combination, can quick separation big granule impurity again, and through the fine quartz sand filter plate retention microsuspensoid, significantly reduce the load of subsequent processing unit, guarantee the long -term stable operation of reaction box and adsorption tower.

The utility model discloses a kind of shallow sand filter filter core, including flange and filter core screen cylinder, the one end of filter core screen cylinder is closed blind end, the other end is open open end;Still including connecting pipe and connecting disc, the connecting disc has center hole, one end of the connecting pipe is inserted into the flange, and is connected with the flange sleeve fixedly, the other end of the connecting pipe is inserted into the center hole of the connecting disc, and is connected with the connecting disc sleeve fixedly, the open end of the filter core screen cylinder is installed on the side surface of the connecting disc away from the flange, the diameter of the filter core screen cylinder is greater than the aperture of the center hole.The utility model shallow sand filter filter core, by increasing the filter surface of the filter core screen cylinder, reduce water flow velocity, let sand layer filler sand grain in shallow sand filter, water flow, small particulate in water flow can be more orderly, not be stirred and mixed, improve water quality, reduce water pressure simultaneously, prevent filter core blockage, increase water flow.

The present disclosure relates to a method and system for sewage reuse, the method comprising the following steps: making the sewage to be treated sequentially enter a first catalytic oxidation unit, a first denitrification filter tank unit, a first carrier enhanced BAF unit, a manganese sand unit and a double membrane unit for treatment to obtain concentrated water and fresh water; making the concentrated water sequentially enter a high-density unit, a second catalytic oxidation unit, a second denitrification filter tank unit, a second carrier enhanced BAF unit and a sand filter unit for treatment; the second carrier enhanced BAF unit comprises a second carbon-based carrier, a second engineering bacteria and a second nutrient salt; the second nutrient salt comprises phenol. The method provided by the present disclosure can perform deep treatment on sewage for reuse, so as to improve the utilization rate of sewage.

This invention relates to the field of chemical wastewater treatment technology, specifically to a filter media suitable for removing fine particles from MTO wastewater, its preparation method, and its application. The filter media includes a core functional phase, which is refined quartz sand modified by hydroxylation. The mass percentage of the quartz sand is not less than 95%, and the particle size of the quartz sand is designed as either a single-stage distribution or a two-stage gradient distribution. The single-stage distribution quartz sand has a particle size range of 1.0 to 2.0 mm; the two-stage gradient distribution quartz sand includes an upper layer with a particle size range of 0.3 to 0.5 mm and a lower layer with a particle size range of 1.0 to 2.0 mm. This invention achieves highly efficient targeted removal of submicron particles. Through surface hydroxylation modification of the refined quartz sand, the electrostatic adsorption and surface bonding ability of the filter media for fine catalyst particles is significantly improved. The removal rate for particles of 0.5 to 5 μm is consistently above 92%, breaking through the technical bottleneck of low retention rate of particles smaller than 3 μm in traditional quartz sand filter media.

This application provides a wastewater treatment flow sand filter, including a sand washing chamber and a sludge discharge chamber, which are connected by a barrier filter screen; a roller press and a drive mechanism; the roller press is rotatably installed in the sand washing chamber and divides it into a pretreatment chamber and a rinsing chamber; the side wall of the roller press has a drop trough connecting the rinsing chamber and the pretreatment chamber; the diameter of the drop trough is larger than the sand particle size but smaller than the colloidal particle size; the mesh size of the barrier filter screen is smaller than the sand particle size; a sand lifting pipe extends through the roller press into the rinsing chamber; the bottom wall of the rinsing chamber has a backwashing channel for clean filtrate to rise; the water used to wash the sand continues to rise and enters the sludge discharge chamber through the barrier filter screen, thereby driving the colloidal particles outward, improving the cleaning effect of the colloidal particles and reducing the risk of sand caking; the sand is blocked by the barrier filter screen, solving the problem of sand loss.

The present application relates to the technical field of cooling tower filtration, and discloses a cooling tower circulating water filter and recovery device, which comprises a base, the top of the base is fixedly connected with a pump, and the top of the base is fixedly connected with two sand filter tanks, sewage flows out from the water inlet of the sand filter tank, at this time, the water gap area formed by water inlet one and water inlet two is smallest, when backwashing, the water gap area formed by water inlet one and water inlet two is increased, at this time, the quartz sand and anthracite coal stuck on the flow-through port lose the limitation and are impacted upward by water vapor, since water vapor continuously flows outwards, the quartz sand is difficult to flow into the fixed plate from the outside of the outer filter head, the problem that the filter head is blocked by the tiny quartz sand or anthracite coal, resulting in incomplete backwashing, is effectively prevented.

The application discloses a kind of small molecule water containing plantain fruit extract and a preparation method thereof, and belongs to the field of biotechnology.The mountain spring water is sequentially filtered by quartz sand filter, activated carbon filter, security filter, ultrafiltration membrane or nanofiltration membrane or reverse osmosis membrane, ozone mixed disinfection, then the treated mountain spring water is mixed with plantain fruit extract to obtain small molecule water containing plantain fruit extract.The small molecule water containing plantain fruit extract maintains pure natural plant activity, has the characteristics of alkalinity, negative potential and smaller cluster, and has stable performance and simple preparation method.

The present application relates to a kind of pure water generating device for detergent, including raw water tank, booster pump, multi-medium filter, activated carbon filter, softener, security filter, high-pressure pump, reverse osmosis device, purified water tank and sterilization device.The device also includes backwash tank and backwash pump, backwash tank is connected with activated carbon filter, backwash pump is connected with backwash tank, and limit net rack, upper support net rack and lower support net rack are sequentially and spacedly arranged in the tank body of multi-medium filter from top to bottom;Manganese sand filter material is filled between limit net rack and upper support net rack, and quartz sand filter material is filled between upper support net rack and lower support net rack;Backwash pipe is communicated with the bottom of tank body;Drain pipe is connected to the side of tank body, and drain valve is installed on the drain pipe;The pure water device of the application is provided with vibration device, and better backwash effect can be achieved by differential vibration and water flow scouring, and automatic backwash can be realized without manual operation.

This utility model relates to the field of silica sol production technology, specifically a filtration device for producing semi-finished silica sol using the silica powder method. It includes a plate and frame filter press, with a first conveying pipe on the surface of the filter press. A slurry pump is installed at the end of the first conveying pipe furthest from the filter press. Through the connection between the plate and frame filter press and the first conveying pipe, this utility model achieves solid-liquid separation of the semi-finished silica sol using mechanical pressure. A quartz sand filter reduces the turbidity of the semi-finished silica sol, achieving purification. Silica powder is removed a second time by an ion exchange resin filter, which also adjusts the alkalinity of the semi-finished silica sol. The purified semi-finished silica sol is stored in a semi-finished product tank. The quartz sand filter and ion exchange resin filter can be repeatedly rinsed through a tap water pipe. A three-phase pipeline connects to a wastewater tank to store filtered water, effectively removing fine silica powder from the semi-finished silica sol.

The application discloses a sand filter for a micro-irrigation system and a use method thereof. The filter comprises a filter tank body, a water distributor primary filter assembly, a hierarchical fine filter assembly and a filter cap final filter assembly arranged in the filter tank body. The water distributor primary filter assembly is arranged on a water inlet pipe of the filter tank body, and a camera is arranged on the water distributor primary filter assembly. The hierarchical fine filter assembly is arranged in the filter tank body. The filter cap final filter assembly is arranged on a water outlet pipe at the bottom of the filter tank body. Control valves and high-precision pressure gauges are arranged on the water inlet pipe and the water outlet pipe. The water distributor primary filter assembly, the hierarchical fine filter assembly and the filter cap final filter assembly can be used to perform hierarchical fine filtration on impurities such as particulate matters and organic pollutants in the water source of the micro-irrigation system. The filter has the characteristics of uniform water distribution, simple and comprehensive backwashing, real-time monitoring and testing of the filter material blockage process in the closed tank body, the water conservancy performance and the filtering capacity of the filter, effective prevention of hydraulic classification, convenient maintenance, and high filtering efficiency.

The application discloses a fracturing gate valve with a sand filtering ring and belongs to the field of shale oil and gas exploitation equipment. The device comprises a valve body, two flow channel pipes fixedly connected to the valve body and symmetrically arranged on the two sides of the valve body, and a mounting disc fixedly connected to the flow channel pipe. The valve seat on the valve body is adhered to the valve block under the action of the reverse push spring and the moving column, so that the flowing fracturing fluid cannot seep out of the flow channel pipe and the flow-through hole of the valve block. Thus, the fracturing fluid is prevented from entering the valve body, the fine sand in the fracturing fluid continuously exists in the valve body, the fine sand is rubbed with the valve block when the valve block moves, and the valve block is abraded. The valve block with the size error is arranged, so that the valve block is not too small to play a closing role in the valve body, the fracturing fluid is prevented from seeping out of the valve body, and the sealing gasket on the valve seat is used to prevent the fracturing fluid from seeping out of the gap of the valve seat and entering the valve body.

The utility model belongs to underground water processing technical field, concretely relates to integrated treatment device of underground water. Including the filter that washes itself, bag type filter, ion exchanger, sedimentation tank, sand filter tank and disinfection tank that connect in proper order, ion exchanger's export is equipped with water quality detector, still including the regeneration system that links to each other with ion exchanger, and the regeneration system includes the brine tank, brine pump and brine filter that connect in proper order, and brine filter's export links to each other with ion exchanger's regeneration liquid import, ion exchanger and the cleaning fluid export of filter that washes itself links to each other with denitrification filter bed respectively, and the export of denitrification filter bed is connected to brine tank recycling through pipeline, still including PLC control system. Through PLC control system coordination each processing unit, realize the efficient removal of underground water suspended solids and nitrate nitrogen, utilize regeneration system to promote resin utilization rate simultaneously, through denitrification filter bed recycling cleaning fluid, reach the purpose that the treatment effect is stable, the resource is saved.

The utility model discloses a blast furnace slag flushing water waste heat recovery heat pump, including support baseplate, the upper surface fixed mounting of support baseplate has heat pump machine, the upper surface fixed mounting of support baseplate has intercepting box, the upper surface fixed connection of support baseplate has fixed block, the upper surface fixed connection of fixed block has filter assembly, the inside of intercepting box is provided with intercepting grid, filter assembly includes filter cartridge, the inner ring screw thread connection of filter cartridge has screw cap, the inner wall screw thread connection of screw cap has quartz sand filter screen, one end of screw cap is fixedly connected with the connector, the top of support baseplate is equipped with precision filter, one end of precision filter is fixedly connected with the communicating pipe. The device passes through the pretreatment filter structure, guarantees the stable operation of heat pump machine, makes it can continuously efficiently promote the heat of the slag flushing water to higher temperature, satisfies the heat utilization demand, improves the waste heat recovery efficiency.

The utility model discloses a quartz sand filtering and cleaning device, including jar body, the jar body one side is provided with the storage mechanism of convenient storage water source, the first pipeline is fixedly arranged with inlaying in the jar body, first three -way solenoid valve is fixedly arranged with one side of the first pipeline, the second pipeline is fixedly arranged with inlaying in the jar body, second three -way solenoid valve is fixedly arranged with one side of the second pipeline, third pipeline is fixedly arranged with one side of second three -way solenoid valve. The utility model discloses when needing to carry out backwashing, first three -way solenoid valve is in complete closing state at this time, and second three -way solenoid valve makes third pipeline be in intercommunication state, and after starting water pump, water pump injects the water source in the inside of storage jar into the inside of jar body, and carries out backwashing to the inside of jar body, and sewage is discharged through second pipeline and third pipeline, and then the water source of storage part is filtered, and then backwashing is carried out using the water source of storage, and energy -conserving is convenient.

The utility model discloses phosphorus chemical industry phosphogypsum percolate full membrane method pretreatment device belongs to environmental protection technology and chemical waste treatment technical field, phosphorus chemical industry phosphogypsum percolate full membrane method pretreatment device, including starting jar, the feed inlet of setting in the starting jar top edge part and the discharge outlet of setting in the starting jar lateral wall root, the top end middle part of starting jar is equipped with the drive motor, the inside installation of starting jar is equipped with the stirring oar transmission connection with the power output of drive motor, one side of starting jar is provided with precision filter, be provided with liquid outlet, liquid inlet, clear liquid outlet and deslagging port on precision filter, the conduction connection between liquid outlet with feed inlet, it can replace traditional " sand filter + microfiltration + ultrafiltration " etc. Combined equipment, and the clear liquid reaching the purpose of entering reverse osmosis system can be realized in one -step filtration, greatly shorten phosphogypsum percolate pretreatment process, improve the processing efficiency.

The utility model relates to the technical field of breeding equipment, and disclose a kind of zero water change of sand class aquatic animal circulation water aquaculture equipment, including several breeding barrels, and the multifunctional barrel is equipped in breeding barrel side, and ceramic filter layer is placed in the bottom of breeding barrel inner wall, and sand filter screen is fixed in the top of ceramic filter layer in breeding barrel inner wall, and breeding sand layer is equipped in the upper portion of sand filter screen, the device is integrated bottom water flow plowing, microfiltration separation and low oxygen denitrification triple technology by breeding barrel and multifunctional barrel, microfiltration machine is realized water efficient solid-liquid separation by screen dynamic interception mechanism, to remove larger impurities in aquaculture wastewater in physical interception mode, sponge barrel top connecting cover plate creates low oxygen environment, and internal filling biochemical sponge, after the water treated by microfiltration machine, further denitrification reaction occurs, reach the water quality purifying effect, and oxygen and water are efficiently mixed by gas-liquid rotation mixing and gradient dissolution mechanism of dissolving oxygen device, so that oxygen-rich water enters breeding barrel.

The utility model provides a novel freshwater fish factory recirculating aquaculture system which comprises an aquaculture pond, a vertical flow precipitator, a microfilter pond, a biochemical air floatation pond, a sand cylinder filter, a nano denitrification system and a multi-stage air stripping system, the aquaculture pond is respectively connected with the vertical flow precipitator and the microfilter pond, the vertical flow precipitator is connected with the microfilter pond, the biochemical air floatation pond is connected with the sand cylinder filter, and the nano denitrification system is connected with the biochemical air floatation pond. The biochemical air floatation tank is connected with the microfilter tank through a pipeline, the biochemical air floatation tank comprises an air floatation bin, a pump bin, a biochemical bin and a denitrification bin, and the pump bin is respectively connected with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system through pipelines; and circulating pumps are arranged on pipelines for connecting the pump bin with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system. According to the utility model, the multi-stage cooperative treatment system is constructed and the denitrification system is introduced, so that the total nitrogen removal rate of the culture system is increased to 96%, which is increased by 140% compared with that of the traditional system, the water supplementing amount of the system is reduced, the daily water supplementing amount is reduced to be less than 3%, and the water-saving rate of the total circulating water amount is more than 70%.

The utility model relates to the seaweed wastewater treatment field relates to a device of recycling salt alkali and organic matter in seaweed wastewater, the utility model device, include: pretreatment unit, filter adsorption unit, membrane separation unit and collection unit, pretreatment unit includes cyclone desander and multistage sedimentation tank, filter adsorption unit includes multistage sand filter jar and disc filter, membrane separation unit includes alkali -resistant nanofiltration ware and reverse osmosis membrane group, collection unit includes thick water collection jar no.