37 results about "Low dissolved oxygen" patented technology

The utility model provides a biological nitrogen and phosphorus removal system for sewage, and relates to the technical field of sewage treatment. The system comprises an anaerobic zone, a denitrification anoxic zone, a low dissolved oxygen aeration zone, a solid-liquid separation zone and an equipment zone which are sequentially communicated along a sewage flowing direction, all biochemical areas in the system are operated at high sludge concentration; the anaerobic zone is connected with a water inlet pipe; the solid-liquid separation area is provided with a drainage pipe; and the equipment area comprises stirring equipment and dissolved oxygen providing equipment. According to the biological nitrogen and phosphorus removal system for the sewage, provided by the utility model, the organic matter intake capacity and phosphate release capacity of microorganisms in the anaerobic zone can be improved, and synchronous nitrification and denitrification and denitrification phosphorus removal reaction can be promoted in the denitrification anoxic tank to remove nitrogen and phosphorus; synchronous nitrification and denitrification and phosphorus accumulation reaction can be performed in the low-dissolved-oxygen aeration area, organic matter removal is realized, no additional carbon source is needed, the aeration intensity is small, the operation energy consumption is low, and the treatment effect is good.

The invention relates to the technical field of micro-ecology, in particular to a rhodococcus coryneform strain and application thereof in aquaculture. The invention discloses a strain of Rhodococcus corynobacteria, and the preservation number of the strain is CGMCC (China General Microbiological Culture Collection Center) No.23799. The invention further discloses a preparation method of the strain of Rhodococcus corynobacteria. The rhodococcus strain can oxidize sulfides under the condition of low dissolved oxygen, does not reduce the pH value of a water body, reduces sulfide pollution of an aquaculture water body, relieves bottom mud acidification, and has no toxic effect on cultured animals.

The invention provides a two-stage HRBPR-PN / A process and device based on sludge biological enhancement. In the front section of the process, an endogenous carbon source is taken in and phosphate is released in an anaerobic stage through phosphorus-accumulating bacteria (PAOs), and then excessive phosphorus is absorbed in an aerobic stage. And the rear stage is an anaerobic / aerobic alternate operation short-cut nitrification anaerobic ammonia oxidation (PNA) process, under the condition of low dissolved oxygen, ammonia oxidizing bacteria AOB and anaerobic ammonia oxidizing bacteria AnAOB cooperate to efficiently remove nitrogen, and meanwhile, residual organic matters in the previous stage and nitrate in the system are removed by strengthening endogenous denitrification. The method comprises the following steps: introducing residual sludge containing a small amount of AOB from an HRBPR section, and periodically adding the residual sludge into a PN / A reactor according to a volume ratio of 0.1-5%; according to the process, segmented DO control is adopted, NOB ecological niche inhibition and short-cut nitrification long-term stability are achieved, and synchronous deep nitrogen and phosphorus removal can be achieved without additional carbon sources and chemical agents. The device has the advantages of low energy consumption, low sludge yield, high operation stability and the like, and is suitable for energy-saving and efficient treatment of urban low-C / N-ratio sewage.

The application discloses a kind of Phascolosoma esculenta seedling cultivation methods, it is related to the technical field of mariculture.(1) parent culture;(2) labor induction;(3) sea ball larva cultivation;(4) the preparation of benthic cultivation pool;(5) planktonic larva metamorphosis induction;(6) the cultivation management of benthic larva.The application can effectively improve the efficiency of feeding sea mud of creeping stage larva, improve the dissolved oxygen in silt substrate, reduce the low dissolved oxygen caused by accumulated water during the process of dry, and the high mortality rate.

This invention relates to the field of wastewater biological treatment technology, specifically to a device and method for improving the autotrophic denitrification performance of a MABR reactor. It employs a composite membrane module combining a curtain-type silica gel filament membrane with excellent oxygen permeability with a spatial three-dimensional mesh packing material that facilitates the attachment of anaerobic ammonia-oxidizing bacteria, thereby coupling part of the nitrification reaction with the anaerobic ammonia oxidation reaction. Through the circulating reaction zone and membrane reaction zone within the reactor, nitrate nitrogen generated by anaerobic ammonia oxidation and excess nitrite nitrogen during instability adjustment are circulated and removed, thus improving the total nitrogen removal efficiency of the reactor. By adding appropriate amounts of sodium nitrite solution at appropriate times, the free nitrite concentration in the reactor mixture is increased. Simultaneously, the intermittent aeration ratio of the MABR is controlled to achieve synergistic inhibition of nitrite-oxidizing bacteria activity by low dissolved oxygen and high free nitrite, allowing the unstable short-range nitrification reaction to recover and improving the autotrophic denitrification performance of the reactor.

This invention relates to a device and method for rapidly starting a short-cut nitrification process, belonging to the field of water treatment. The invention involves inoculating a secondary sedimentation tank with sludge and adding a polyurethane biological sponge carrier into a sequencing batch reactor (SBR). First, a phased influent influent + incremental post-aeration strategy (increasing aeration time first, then increasing aeration rate) is adopted. This utilizes nitrate and a dynamic oxygen environment to drive the migration of *Candidatus Contendobacter* to the sponge carrier and complete its enrichment and acclimatization, reducing the obstruction of O2 on the endogenous denitrification process of *Candidatus Contendobacter* under aerobic conditions. The phased influent influent is then eliminated, and NH4 is introduced. + -N synthesis wastewater is treated using a low-alkalinity strategy (reducing influent KHCO3 concentration) + post-aeration with an initial increase followed by a decrease in aeration volume, combined with strong NO2 stimulation from Candidatus Contendobacter in a low dissolved oxygen environment. ‑ -N reducing power inhibits NOB growth, enabling rapid start-up of the short-cut nitration process.

This invention discloses a gradient dissolved oxygen-guided multi-filler synergistic submersible aeration and purification device. The device includes: an aeration zone for aeration, with an aerobic layer with high dissolved oxygen content installed at the upper end of the aeration zone, an anoxic layer with low dissolved oxygen content installed at the upper end of the aeration zone, and an anaerobic layer installed at the lower end of the anoxic layer; the aeration zone includes an aeration cylinder with a permeable inner cylinder containing an aeration component that sprays air horizontally; the aerobic layer includes a first packing cylinder. The gradient dissolved oxygen-guided multi-filler synergistic submersible aeration and purification device provided by this invention, through the synergistic effect of aeration in the aeration zone and the gradient porosity packing layer, forms a stable dissolved oxygen gradient of "aerobic upper layer – anoxic middle layer – anaerobic lower layer," simultaneously meeting the functional requirements of nitrification, denitrification, and phosphorus removal.

The application discloses a method for rapidly improving river water dissolved oxygen, and belongs to the technical field of environmental protection. The method comprises the following technical steps: (1) water quality fluorescence fingerprint database establishment; (2) pollution source dissolved oxygen concentration gradient division; (3) low-oxygen discharge outlet dissolved oxygen and water flow determination; (4) water quality fluorescence fingerprint similarity comparison; and (5) river required ecological water flow calculation. The method comprises the following steps: establishing a water quality fluorescence fingerprint database, dividing a pollution source dissolved oxygen concentration gradient, determining low-oxygen discharge outlet dissolved oxygen and water flow, comparing water quality fluorescence fingerprint similarity, and calculating the ecological water flow required for river water dissolved oxygen to reach the standard. Then, the ecological water flow is dispatched to equivalently hedge the water body with low dissolved oxygen concentration in the river mainstream, so that the river water dissolved oxygen concentration can be simply, rapidly, efficiently and accurately improved, water resource waste in the water flow dispatching process is avoided, the method has good precision and strong operability, and is easy to popularize on a large scale.

The application discloses a short-process sewage treatment process with low dissolved oxygen operation, which adopts two-stage biochemical treatment to realize simultaneous nitrification and denitrification under the conditions of micro-dissolved oxygen (DO 0.5-1.5 mg / L) and low-dissolved oxygen (DO 1.5-2.5 mg / L); a new aeration mode combining cyclone aeration and micropore aeration is adopted to promote the fluidization of fillers, strengthen mass transfer, make the dissolved oxygen concentration controllable and not cause the abrasion of fillers; the mud film mixed mode is adopted to operate, and a low activated sludge concentration is set to guarantee that the ammonia nitrogen in the effluent meets the standard under the short process, and the residual sludge is reduced. The process greatly shortens the traditional denitrification process flow, significantly improves the denitrification efficiency, effectively reduces the aeration energy consumption under the low-dissolved oxygen operation, reduces the unnecessary aeration amount through fine aeration control, realizes energy saving and efficiency increase, and further reduces the number of process units, reduces the land occupation and construction cost.

This invention relates to an adaptive aerator for aquaculture ponds, comprising: a water quality monitoring module for real-time acquisition of aquatic environmental parameters in the aquaculture pond and transmission to a central processing unit (CPU) module; a CPU module for determining the oxygenation demand and required oxygenation areas based on the aquatic environmental parameters, generating control commands and sending them to an intelligent navigation module and an adaptive aeration module; an intelligent navigation module for controlling the position and direction of the aerator based on the control commands combined with inertial navigation system information and GPS location information, to reach the required oxygenation area; an adaptive aeration module for controlling the aerator to perform oxygenation based on the control commands after reaching the required oxygenation area; and an Internet of Things (IoT) module for connecting all modules to the Internet and providing remote monitoring and control. This invention can automatically detect the dissolved oxygen distribution in the water, adaptively move to areas with low dissolved oxygen for oxygenation, and automatically adjust the aerator's power output according to the dissolved oxygen level.

The invention relates to the technical field of environmental biology, and discloses a short-cut nitrification-denitrification complex microbial inoculant and a preparation method thereof. The method includes; the method comprises the following steps: respectively culturing ammonia oxidizing bacteria, denitrifying bacteria and heterotrophic nitrification-denitrifying bacteria, mixing, and co-domesticating under a low dissolved oxygen condition to obtain a co-domesticated flora; and then adding into sodium alginate-polyvinyl alcohol, immobilizing by a calcium chloride-boric acid-glutaraldehyde system, and freeze-drying to obtain the complex microbial inoculant. The prepared complex microbial inoculant can stably realize synchronous short-cut nitrification and denitrification under the condition of low dissolved oxygen, is high in nitrite accumulation rate, remarkably improves the removal rate of ammonia nitrogen and total nitrogen, has the advantages of stable flora structure, high denitrification efficiency and low operation energy consumption, and is suitable for industrial production. The method can be widely applied to biological nitrogen treatment of urban sewage and high-ammonia-nitrogen industrial wastewater.

The invention provides a method and system for removing high-concentration complex cyanogen in gold extraction wastewater, and relates to the technical field of sewage treatment.The method comprises the steps that the pH of the gold extraction wastewater is adjusted to 8-10, and pretreated wastewater is obtained; adding a cobalt ferrite particle catalyst into the pretreated wastewater, and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into a solution A and a solution B according to a volume ratio, oxidizing the solution A by using anaerobic ammonium oxidation bacteria under the condition of low dissolved oxygen, and mixing the oxidized solution A with the untreated solution B to obtain a mixed solution; enabling the mixed solution to react with anaerobic ammonium oxidation bacteria through a porous adsorption material, and recovering the cobalt ferrite particle catalyst for recycling. According to the method, the removal rate of the high-concentration complex cyanogen can be effectively increased, thorough mineralization of the complex cyanogen is achieved, and the core problem that the complex cyanogen is difficult to degrade is solved; and the method and the system have relatively high load resistance, are simple and convenient to operate and have good adaptability.

The present invention belongs to the technical field of river water body treatment facilities, and in particular relates to an underwater forest ecological restoration structure. The present invention makes the ecological restoration effect of the underwater forest more prominent, flexible, and comprehensive by arranging a lifting suspension box unit, a lifting frame unit, and a porous strip unit on the water-retaining wooden pile unit. The present invention has the following advantages: First, the water-retaining wooden pile unit is high on both sides and low in the middle, so that the cleaning boat can pass normally, ensuring that the overall sewage treatment effect of the river is more prominent and comprehensive; second, the underwater forest structure includes submerged plants, emergent plants, and microorganisms, so that many water purification effects such as reducing the nitrogen and phosphorus content in the water, increasing dissolved oxygen, absorbing heavy metals, and settling suspended pollutants can be achieved.

The present invention provides a process for preparing a composition having a low dissolved oxygen content comprising acetaminophen and optionally one or more NSAIDs wherein the composition has a dissolved oxygen of at most 1.0 ppm in a closed container, said process comprising flushing the mixing container at least once with water at a temperature of at least 80 DEG C, and the composition obtained therefrom, thereby heating the container and creating a hypoxic environment in the container; and dissolving the acetaminophen in water for injection in the flushed container, the water for injection having a temperature of at least 80 DEG C wherein one or more NSAIDs are optionally added before or after dissolving the acetaminophen. The method of the present invention can produce a stable, intravenously administered aqueous composition without the need to deoxidize the composition.

This application relates to the field of rotifer culture technology and discloses a method for regulating rotifer body size. This application successfully controls the body size of marine rotifers by regulating factors such as dissolved oxygen, temperature, salinity, and feed. Specifically, the conditions for large-scale rotifer culture include relatively low dissolved oxygen, temperature, and a larger feed, while the conditions for small-scale rotifer culture include relatively high dissolved oxygen, temperature, and a smaller feed. Certain cyanobacteria can also be used as supplementary feed. This application stably controls the environmental conditions for marine rotifer body size and selectively modifies the feed for the rotifers, achieving the goal of selectively regulating the body size of marine rotifers.

The invention discloses a method for predicting the lowest dissolved oxygen of a rice and shrimp water body by using a random forest algorithm, and relates to the technical field of agricultural meteorological disaster risk early warning and assessment. The method comprises the following steps: collecting observation data of water temperature, water quality, dissolved oxygen and synchronous weather of water bodies at different depths of a rice and shrimp pond, and carrying out quality control processing on various observation data; analyzing comprehensive factors of the rice and shrimp water body low dissolved oxygen disaster process; analyzing a key driving factor influencing the lowest dissolved oxygen of the water body, and establishing a key variable data set based on daily scale; according to the method, the water temperature, water quality and dissolved oxygen of the rice and shrimp water body over the years and meteorological observation data above the rice and shrimp pond in the same period are systematically analyzed, the occurrence season and the occurrence time period of the low dissolved oxygen in the water body and other accompanying main control factors are screened out, and the disaster-inducing indexes of the low dissolved oxygen disaster are more accurately grasped; the method can truly reflect the influence of various other main factors on the low dissolved oxygen formation rule, and provides a more reliable scientific basis for forecasting the low dissolved oxygen in the rice and shrimp water body.

The application provides a method and system for removing high-concentration complex cyanide in gold extraction wastewater, and relates to the technical field of sewage treatment. The method comprises the following steps: adjusting the pH of the gold extraction wastewater to 8-10 to obtain pretreated wastewater; adding a cobalt ferrite particle catalyst to the pretreated wastewater and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into solution A and solution B according to the volume ratio, oxidizing solution A under the condition of low dissolved oxygen by using anaerobic ammonia oxidation bacteria, mixing the oxidized solution A with untreated solution B to obtain a mixed solution; and reacting the mixed solution with porous adsorption material and anaerobic ammonia oxidation bacteria, and recycling the cobalt ferrite particle catalyst for circulation. The method used by the application can effectively improve the removal rate of high-concentration complex cyanide, realizes complete mineralization of the complex cyanide, solves the core problem of difficult degradation of the complex cyanide, has strong load resistance, is simple to operate, and has good adaptability.

This invention discloses a method for enhanced nitrogen and phosphorus removal from wastewater with low carbon-to-nitrogen ratio using algae-bacterial granular sludge, comprising the following steps: inoculating an algae-bacterial symbiotic sludge into a sequencing batch reactor; introducing domestic sewage, performing low-DO aeration, subjecting the reactor to light treatment, and operating the reactor in an anaerobic / aerobic / anoxic mode, thereby forming algae-bacterial symbiotic sludge into algae-bacterial granular sludge; and controlling the dissolved oxygen concentration of the low-DO aeration to 0.4–0.6 mg·L⁻¹. ‑1 The inoculated sludge concentration is 4000-5000 mg / L. This invention employs low dissolved oxygen aeration combined with lighting to drive algae and bacteria granular sludge to achieve endogenous carbon compensation, significantly reducing the carbon source demand in the denitrification and phosphorus removal process of low carbon-to-nitrogen ratio wastewater, lowering wastewater treatment operating costs, and avoiding secondary pollution caused by carbon source addition.

The present invention provides a silicon nitride sintered body having a low dissolved oxygen content, high thermal conductivity, and high strength, and suitable as a base substrate of a bonded substrate. This silicon nitride sintered body has a grain boundary phase containing one or more rare earth elements selected from the group consisting of Y, Sc, La, Ce, Sm, Gd, Dy, Ho, Er, Lu, and Yb, and each element of Mg, Si, O, N, and Sr. The Sr content in the sintered body is 5.0×10-3 mol% to 1.0×10-1 mol%. The ratio of the area of β-type silicon nitride particles having a major axis diameter of 10 μm or more to the total area occupied by all the β-type silicon nitride particles at any cross-sectional position of the sintered body is 2% to 50%.

The present invention discloses a method for sulfur-inhibiting flotation of mixed sulfur concentrate in a low dissolved oxygen environment. The method comprises: grinding the mixed sulfur concentrate with kerosene, adding part of the inhibitor during the grinding process to obtain a concentrated slurry; adding water to the concentrated slurry for slurry adjustment, sequentially adding the remaining inhibitor and alkaline agent to adjust the DO value, pH value and OPR value of the slurry, and then adding a frother for roughing; adding a collector to the tailings obtained from the roughing to scavenge and obtain scavenged ore and sulfur tailings; adding an alkaline agent to the concentrate obtained from the roughing to adjust the pH value again and then concentrating to obtain copper-molybdenum concentrate and concentrating middlings, and then combining the scavenged ore and the concentrating middlings and returning them to the slurry adjustment process for a cyclic operation. The method inhibits pyrite flotation by jointly regulating the DO value, pH value and ORP value, achieves efficient pyrite inhibition under high-altitude, low-dissolved oxygen and low-alkalinity conditions, significantly improves the grade of copper-molybdenum concentrate, and effectively improves the economic benefits of mine development while protecting the high-altitude mine environment.

The invention provides an intermittent high-low dissolved oxygen control short-cut nitrification nitrogen removal device and method, and relates to the technical field of domestic sewage treatment engineering design, the intermittent high-low dissolved oxygen control short-cut nitrification nitrogen removal device comprises an anaerobic section: converting refractory organic matters into an easily degradable carbon source through hydrolytic acidification bacteria, absorbing the easily degradable carbon source through denitrifying glycogen-accumulating bacteria and synthesizing intracellular storage substances, synchronous anaerobic phosphorus release of aerobic phosphorus-accumulating bacteria; in the anoxic section, nitrite refluxed in the aerobic section and part of ammonia nitrogen in inlet water are subjected to anaerobic ammonia oxidation reaction through Anammox bacteria to generate nitrogen; in the aerobic stage, hydroxylamine is added, in combination with intermittent high-low dissolved oxygen control, residual ammonia nitrogen in inlet water is selectively oxidized into nitrite through Comamox bacteria, and meanwhile, aerobic phosphorus-accumulating bacteria absorb phosphorus by using an intracellular carbon source; and a rear anoxic section. According to the invention, the efficient cooperation of the hydrolytic acidification bacteria, the aerobic phosphorus-accumulating bacteria, the denitrifying glycogen-accumulating bacteria, the Anammox bacteria and the Commox bacteria is utilized, so that the energy-saving low-carbon green sewage biological treatment is realized.

Viscosity-resistant Corynebacterium glutamicum and a use thereof, relating to the technical field of biological genetic engineering. The Corynebacterium glutamicum is obtained by mutating Corynebacterium glutamicum ATCC 13032. Mutation sites include: cytosine mutation to thymine at the position 862902; guanine mutation to adenine at the position 862903; cytosine mutation to thymine at the position 862953; adenine mutation to guanine at the position 862961; cytosine and thymine insertion at the position 862958; and guanine deletion mutation at the position 862963. The tolerance of the Corynebacterium glutamicum in a highly viscous environment and the growth and metabolism ability of the Corynebacterium glutamicum in a low dissolved oxygen environment are significantly improved, thereby improving the yield of a mucopolysaccharide and avoiding the problem of the mucopolysaccharide synthesis being affected by restricted metabolism of the Corynebacterium glutamicum due to a viscous fermentation broth and insufficient dissolved oxygen resulting from the generated mucopolysaccharide.

The invention relates to the technical field of sewage treatment, in particular to an MSBR limit denitrification method based on multi-stage and multi-section dissolved oxygen intelligent regulation and control, which comprises the following steps: arranging physical partitions in a main aeration aerobic unit of an MSBR along a water flow direction, constructing a plurality of independent aeration areas, and forming a'high-medium-low 'dissolved oxygen concentration space gradient field through partition regulation and control; in combination with real-time monitoring data, constructing a dissolved oxygen trend prediction model, and dynamically optimizing a dissolved oxygen concentration gradient field form and a carbon source multi-point differential adding strategy according to a water inlet C / N ratio; and meanwhile, a graded impact judgment and quick response mechanism is established. Through cooperation of a physical configuration and an intelligent algorithm, coupling of multiple denitrification paths is achieved, the denitrification limit of a traditional activated sludge method is broken through, the total nitrogen in effluent of the MSBR is as low as 1.5 mg / L, the daily mean value is smaller than 4 mg / L, energy consumption and chemical consumption are remarkably reduced, the impact resistance of the system is enhanced, and an innovative solution is provided for deep denitrification of sewage.

The application discloses a kind of microbial quick biofilm formation methods based on dissolved oxygen stress, belong to sewage treatment technical field.The core of the method is that through high dissolved oxygen aerobic activation and the alternative cycle of critical low dissolved oxygen anoxic stress, active physiological acclimation and screening are carried out to microbial community, and after each stress cycle, microaerophilic gas supply and low C / N ratio environment are used for directional enrichment, so that in a short time, the biological membrane rich in high-activity nitrifying bacteria and dense structure is quickly constructed on the surface of MABR membrane.The application breaks through the technical bottleneck of long biofilm formation period, intense competition of flora and easy shedding of biological membrane in traditional method, realizes efficient, rapid and stable start of MABR system, and is especially suitable for treatment of high ammonia nitrogen and low carbon nitrogen ratio sewage.

The invention relates to the technical field of water treatment, in particular to an algal-bacterial symbiotic system, denitrification equipment and a nitrogenous wastewater treatment method. The magnetic nitrogen-doped biochar material is coupled with the algal-bacterial symbiotic system, algal-bacterial symbiotic system equipment under the spontaneous low-dissolution condition is innovatively provided, the magnetic biochar provides more reaction sites for microorganisms and algae, and directional regulation and control of a nitrogen metabolic pathway and improvement of electron transfer efficiency under the low-dissolved-oxygen condition are achieved. And the high specific surface area and the excellent pore structure provide stable conditions for self-generation of a low dissolved oxygen environment. According to the technology and the equipment, while the denitrification rate of the wastewater is increased, the aeration cost can be saved, additional carbon sources are not needed, secondary utilization of organic matters in the wastewater is achieved, algae in the treated wastewater is separated, resource recycling is achieved, and the technology and the equipment have wide application prospects.

The invention discloses a low dissolved oxygen enhanced nitrogen and phosphorus removal and sludge settleability improvement system, which comprises four groups of biological tank main bodies running in parallel, every two groups of biological tank main bodies share one set of water inlet channel and one set of water outlet channel, and each group of biological tank main body is sequentially divided into an anaerobic zone, an anoxic zone and an aerobic zone from front to back, every two adjacent anaerobic zone, anoxic zone and aerobic zone are separated by a partition plate, one end of each partition plate is connected with the inner wall of the biological tank main body, a water flow channel is formed between the other end of each partition plate and the inner wall of the biological tank main body, the aerobic zone is horizontally provided with a multi-gallery structure, and the biological tank main body is provided with an aeration system and a filler system. The invention also discloses a system operation method for improving sludge settleability by enhancing nitrogen and phosphorus removal with low dissolved oxygen, and solves the problems that the existing sewage treatment method cannot effectively control the microbial community structure and the system effluent quality under the condition of low dissolved oxygen, and has high energy consumption and high drug consumption.

The invention discloses a same-tank carbon and nitrogen removal process which comprises the following steps: introducing sewage into a low-dissolved-oxygen area through a water inlet end of a BAE reactor, and monitoring the dissolved oxygen concentration in the low-dissolved-oxygen area in real time through a DO sensor a and a DO sensor b, when DO in the low dissolved oxygen area is smaller than or equal to 0.2 mg / L, an air blower is started to supply air, and the microporous aeration device is used for aeration; when the concentration is 1.0 mg / L, air supply of the air blower is stopped, and the low-dissolved-oxygen-area water impeller a and the low-dissolved-oxygen-area water impeller b are started; according to the BAE reactor, anaerobic, facultative, aerobic, water outlet, backflow and other multifunctional areas are integrated into the same tank body, the water flow speed of the low dissolved oxygen area is controlled to be 0.25-0.9 m / s through partition wall division, the occupied area of a traditional multi-tank series connection technology is greatly reduced, through application of an inclined tube sedimentation tank (the liquid level load is 0.5-1.5 m / (m.h)) or an MBR membrane (the membrane flux is 8-15 L / (m.h)), the solid-liquid separation efficiency is remarkably improved, and the solid-liquid separation efficiency is greatly improved. The settling area is reduced, and capital construction investment is saved.

This invention relates to the field of aquaculture technology and discloses a large-scale silver carp and bighead carp seedling cultivation equipment, including a cultivation net cage. A support frame one is installed near the top of the inner wall of the cultivation net cage, and a support frame two is installed near the bottom of the inner wall of the cultivation net cage. A partition net is installed between the inner wall of the support frame two and the inner wall of the cultivation net cage. An oxygen distribution mechanism for uniform oxygen distribution is provided inside the cultivation net cage. The oxygen distribution mechanism includes an oxygenation drive component and an oxygen distribution component. This invention, by setting a differentially rotating oxygen delivery main pipe and a fan-shaped blocking plate, can intermittently block the first oxygen delivery nozzle, causing the internal air pressure of the oxygen delivery branch pipe to periodically increase. This significantly increases the air output rate of the second oxygen delivery nozzle and the nozzle branch pipe, effectively enhancing the oxygen supply intensity near the outer water area of ​​the cultivation net cage. It specifically compensates for the low dissolved oxygen in the outer water body due to its distance from the air source, greatly improving the uniformity of oxygen distribution throughout the entire net cage area.

The invention discloses a rapid microbial biofilm culturing method based on dissolved oxygen stress, and belongs to the technical field of sewage treatment. The core of the method is as follows: active physiological domestication and screening are performed on microbial communities through alternate circulation of high dissolved oxygen aerobic activation and critical low dissolved oxygen anoxic stress, and directional enrichment is performed by utilizing micro-aerobic air supply of an MABR membrane module and a low C / N ratio environment after each stress cycle; therefore, a biological membrane which is rich in high-activity nitrifying bacteria and compact in structure is rapidly constructed on the surface of the MABR membrane within a short time. The method breaks through the technical bottlenecks of long biofilm culturing period, fierce flora competition and easy falling of a biofilm in the traditional method, realizes efficient, rapid and stable starting of the MABR system, and is especially suitable for treatment of sewage with high ammonia nitrogen and low carbon nitrogen ratio.

This water treatment method comprises: supplying, to an ultraviolet irradiation device 35 at an inlet part 35A of the ultraviolet irradiation device 35, water to be treated which has a total organic carbon concentration of 10 μg / L or less and a dissolved oxygen concentration of 30 μg / L or greater; and irradiating the water to be treated, which was supplied via the inlet part 35A to the ultraviolet irradiation device 35, with ultraviolet rays from the ultraviolet irradiation device 35. The water to be treated has a hydrogen peroxide concentration of 30 μg / L or less at the inlet part 35A.