86results about How to "Sufficient dissolved oxygen" patented technology

The invention discloses a hydrophilic and active biological film suspended carrier as well as the manufacturing method thereof. The carrier substrate adopts polyethylene or polypropylene resin, and hydrophilic and polymeric surfactant, biological enzyme accelerator and microbial affinant mixing granulations are added, thereby being molded by extrusion. The carrier is characterized in that firstly, the carrier has good hydrophilicity and mass transferring property; secondly, the carrier has the characteristics of catalyzing the oxidation reaction and the reduction reaction; thirdly, the carrier has microbial affinity; fourthly, the carrier has the characteristics of large specific surface area, fast biological film cultivation speed and high load impact resistance; and fifthly, the manufacturing cost is low, and the processing technology is simple.

The invention discloses a double-layer artificial wetland system for strengthening sewage denitrification and dephosphorization and an operation method thereof. The system comprises an upper layer of wetland, a lower layer of wetland, a water inlet and distribution system and an effluent collection system, wherein the upper layer of the wetland is filled with mineral filler, and the lower layer of the wetland is filled with biologic filler which is favorable for microorganisms to adhere to grow; the water inlet and distribution system is divided into to two branches, wherein one branch is distributed above the upper layer of the wetland, and the other branch is distributed on the interface of the upper layer of the wetland and the lower layer of the wetland; and the effluent collection system is distributed on the bottom of the lower layer of the wetland. The method comprises: waterfall aeration is carried out on sewage by one branch of the distribution system, then the sewage falls into the upper layer of the wetland to remove organic matters, ammonia nitrogen, phosphorus and the like to vertically seep into the lower layer of the wetland; in order to supplement a carbon source, a small strand of sewage is introduced into the lower layer of the wetland by the other branch of the distribution system to be mixed with the sewage seeped from the upper layer of the wetland for denitrification; and water is discharged from the effluent collection device after being processed. The invention occupies small area, has small possibility of being blocked and has favorable denitrification and dephosphorization effects and low investment operation cost.

The invention discloses a kind of method for American hilsa herring ecological type cultivation, which mainly comprises controlling the main element of water environment, the oxygen sag is more than 3mg / L, the temperature is between 10-30DEG C; regularly add the probiotics compound and feed into water to improve water quality, restrain the growing and breeding of harmful bacterium; reasonably adjust the cultivation density to ensure the eating intensity of hilsa herring collectivity and abundant oxygen sag; decrease the irritated response that cause by noise,light and color; mixed cultivate tilapia and jade perch, proceed biological control for flush ulotrichineae and conch; adjust the nutrition ingood time for the special need of hilsa herring growth.

The invention provides a method for artificial fertilization and hatching of hexagrammos otakii, which is used for solving the problems that spawns of the hexagrammos otakii in marine fishes have low fertilization rate and hatchability because the spawns have viscosity and become agglomerates when meeting sea water. The method adopts an artificial method to shape the spawns of the hexagrammos otakii into a planar type and then perform fertilization to prevent the viscid spawns from becoming the agglomerates so as to ensure that the spawns can fully and effectively contact sperms during the fertilization, the spawn fertilization rate is improved and can reach 93 percent under an artificial condition; besides, the method adopts hanging type hatching for spawn segments after artificial planar shaping to ensure that oosperms can obtain sufficient dissolved oxygen during the hatching and greatly improve the hatchability of the oosperms. Experiments show that the hatchability of the oosperms reaches 85 percent and is far more than 56 percent which is achieved under the conditions of the prior art.

The invention discloses a method for synchronously removing high-concentration ammonia nitrogen, iron and manganese in water through efficient catalytic oxidation. The method adopts a system consisting of a catalytic oxidation filtration system, a reverse flow oxygenation system and a back washing system, the trace oxygenation is implemented at the medium-lower part of catalytic oxidation filtering layers to guarantee that each filtering layer contains sufficient dissolved oxygen, and the catalytic oxidation capabilities of all the filtering layers are given into full play, so that the high-concentration ammonia nitrogen, iron and manganese in water are synchronously removed through catalytic oxidation; and besides, the bottom filtering layer gives full play of the function of guaranteeing filtering. The method has the advantages that the removal efficiency is high, the impact-resistant load is high, the project investment is less, the running cost is low, and the implementation difficulty is small. The method is suitable for the new construction and upgrading transformation of both surface water treatment plants and underground water treatment plants.

The invention discloses an offshore drift line type net cage system. The system comprises a frame, net cages, anchor lines and iron anchors, wherein a main cable is connected with an auxiliary cable to form the frame, floats are bound on the main and auxiliary cables of the frame, two floats are separately bound on the two ends of the main cable; each net cage is bound at each net cage port in the frame, the net cages are arranged in single row and have 50-100m of group distance; the side rope and hanging rope of each net cage are bound on the corresponding positions of the main and auxiliary cables; the position near the central section of the net cover of the net cage is provided with a feeding opening, a float or floating body is bound at the feeding opening; the sinker of the net cage is bound on the bottom surface of the net cage and on the foot line of the position of the hanging rope; and the main anchor line is connected with the main iron anchor and the two ends of the main cable of the frame, and the auxiliary anchor line is connected with the auxiliary iron anchor and the main and auxiliary cables at the four corners of the net cage opening of the frame. The offshore drift line type net cage system has reasonable structure and layout, perfect supporting facilities, good wave and wind resistance, removable combination and convenient operation.

This invention discloses a microporous quartz aerator, which comprises: an aeration plate, an outer jacket, an inner jacket, and an aeration pipe. The lower end of the inner jacket is fixed with an aeration joint, and its upper end is connected with the outer jacket. The aeration joint is connected with a unidirectional air valve. The planar or spherical aeration plate is fixed between the two jackets, and has honeycomb-like pore network inside. The aeration plate is produced by: mixing quartz sand 55-95%, high-temperature fluxing agent 5-45%, and adhesive (3-6 wt. % of quartz sand and fluxing agent), and calcining at high temperatures. The aeration plate has a porosity 30% higher than that of microporous corundum aeration plate, thus has such advantages as low wind resistance, large interface of gas and liquid, uniform bubble diffusion, adequate oxygen dissolution, no air hole blockage, good aeration effect, high wastewater purification quality, increased wastewater treatment efficiency by more than 5 times, good corrosion, acid and base resistance, no aging, and long service life.

The application discloses an energy-saving water-driven enhanced nitrification secondary treatment type biological turntable. The energy-saving water-driven enhanced nitrification secondary treatment type biological turntable comprises a reaction tank and a high water tank arranged above one side of the water tank, wherein a tank body comprises a middle water truck driving area and biological turntable areas distributed on two sides; a water truck and bio-discs connected coaxially are respectively arranged in the water truck driving area and the biological turntable areas; triangular effluent weir crests, guide plates and water distribution plates are arranged in the biological turntable areas; a plurality of right angle partition plates with are arranged on the circumference of the water truck at equal intervals to form water accumulating grooves; a water outlet tube is arranged in a position, lower than the water truck, of the water truck driving area. According to the energy-saving water-driven enhanced nitrification secondary treatment type biological turntable, the water accumulating grooves of the water truck use the right angle partition plates, the water truck is placed in the middle of the reaction tank, the discs are distributed on two sides, so that stress is more uniform, the torque is shorter, the resistance is smaller, the device rotation performance is improved, the oxygenation efficiency is improved, and the water truck loading padding in the water accumulating groove is driven by fist class treated effluent to complete the rapid nitrification.

The invention belongs to the animal culture industry, and in particular relates to an artificial culture method and culture equipment of mysid. According to the artificial culture method of the mysid, the mysid is cultured in an aquatic economic animal culture pond and cultured in a floating modular net cage system placed in a culture water body; and the temperature in the culture process is below 30 DEG C, the salinity of the culture water body is 0 to 300 percent, and the inoculating density is over 100 pieces per liter. The modular net cage culture system is used in the culture method, the mysid is cultured in the aquatic economic animal culture pond, and the size of net cage modules is regulated according to the size of the pond, so that the space of the water body is fully utilized. Meanwhile, the modular net cage culture system prevents the mysid from taking water bottom detritus so as to ensure the cleanliness of the mysid serving as bait.

The invention relates to a sewage and wastewater pretreatment method for an artificial wetland process, which comprises the following steps of: building a water culture tank, and controlling inlet water hydraulic load to determine hydraulic power retention time; according to different varieties of plants, respectively fixing the plants in planting baskets with flexible materials according to different planting densities, and fixing the planting baskets to light materials, or directly fixing the plants to light plate materials floating on water or directly planting the plants in sewage; and guiding the sewages or wastewater subjected to grid and sediment treatment into the water culture tank, putting the prepared plants into the water culture tank, and making the outlet water of the water culture tank directly flowed or pumped to the subsequent artificial wetland. The method can quickly and effectively remove a large quantity of suspended solids and more than a half of organic matters which probably cause the blockage of the artificial wetland in the sewage and wastewater, can obviously improve the dissolved oxygen content in the sewage and wastewater flowing through the water culture tank, improves the efficiency of the wetland of removing pollutants in the water, reduces the area occupied by the artificial wetland, and reduces the investment and operating cost of sewage and wastewater treatment facilities.

The invention belongs to the technical field of drinking water safety, and in particular relates to a drop biological aerated filter suitable for the biological pretreatment of micro-polluted source water in rural areas. After entering the filter, raw water is filtered by a third-level transverse flow gravel filter bed and degraded by organisms attached to the surface of gravel, so that part of particulate matters, ammonia nitrogen and small molecular organic matters are removed from the raw water and the pollution load of a subsequent drinking water treatment process is reduced. The biological filter performs oxygenated aeration in a drop mode according to the actual conditions of underdeveloped economy and low management level in the rural areas; the biological filter consists of the third-level transverse flow gravel filter bed, is filled with readily available gravel or cobbles in the rural areas, can adjust hydraulic retention time through a stop log gate at the tail end of the gravel bed, can be flexibly suitable for the water quality of different rural areas and operates; and the invention can be used as a pretreatment process of the conventional drinking water treatment process or an ultrafiltration membrane treatment process.

The invention discloses a dosing device controlled by an ejector rod impacted by water flow. The dosing device comprises a disinfection tank, wherein an impeller is arranged in the disinfection tank, one side of the disinfection tank is provided with a water inlet pipe, the other side of the disinfection tank is provided with a water outlet pipe, and the water outlet of the water inlet pipe is not lower than the lowest point of the impeller; and a reagent barrel, which is arranged above the disinfection tank and has a dosing port, wherein the reagent barrel is provided with a reagent feeding pipe penetrating the top end of the disinfection tank, the reagent feeding pipe is internally provided with the ejector rod that can reciprocate up and down and extends to the vicinity of a center hole in the impeller, the upper end of the ejector rod is provided with a movable sealing plug matching with the upper orifice of the drug delivery tube reagent feeding pipe, an eccentric link is hinged onto the impeller, and the other end of the eccentric link is hinged to the lower end of the ejector rod. The dosing device is small in size, realizes the automatic control of reagent amounts by the rotation of the impeller under the pushing of water flow in the water inlet pipe, and can work without power resources.

The invention discloses a filter bed breeding system and a factory breeding method of buried-dwelling marine organisms, and belongs to the field of aquiculture. The breeding system comprises a breeding pond, an empty space is arranged at the bottom of the breeding pond, a sand layer filter bed is arranged on the empty space, and a breeding water layer is above the sand layer filter bed; the breeding pond is internally provided with an air-life tube, one end of the air-lift tube communicates with the bottom of the breeding pond, and the other end of the air-lift tube communicates with the breeding water layer; a first oxygen increasing tube is arranged at the bottom of the breeding pond; and a second oxygen increasing tube is arranged at the bottom of the breeding water layer. S and divinghabits of the buried-dwelling marine organisms such as Marsupenaeus japonicus and Babylonia can be satisfied, the problem of bottom substrate changing black during high-density breeding is advantageously solved, the adhesion and purification effect of probiotics are improved, breeding stability is improved, the filter bed breeding system and the factory breeding method of the buried-dwelling marine organisms are suitable for high-density factory breeding of the buried-dwelling marine organisms, and has a good application prospect.

The invention discloses a method for fish culture in a paddy field. The method is characterized by comprising the following steps of selecting the paddy field; planning the paddy field; planting rice;throwing in fries; carrying out feeding management; strictly controlling daily management and the like; and finally achieving a good ecological aquaculture mode of fat fishes and good rice. Accordingto the method, after the fishes are cultivated in the paddy field, a part or most of weeds, benthic animals, plankton and pests in the paddy field are eaten by the fishes, so that the harm to the rice is eliminated, and nutrients in the paddy field are not consumed by the creatures; in addition, faeces of the fishes provide high-quality manure for the growth of the rice, so that the ecological environment of the paddy field is improved, the rice yield is increased, the cultured fishes generally seldom suffer from diseases due to the fact that water of the paddy field is sufficient in dissolved oxygen, and relatively large economic benefits are conveniently achieved; and fish ditches and fish pits are reasonably designed and applied, so that the high-quality production of the rice and thefishes is improved, and a good harvest of both the rice and the fishes is achieved.

A three-dimensional culturing method for crayfish comprises the following steps: S1, arranging a micro-porous aeration device at the bottom in a culture pond; S2, arranging a plurality of crayfish crawling stairs in the culture pond; S3, horizontally arranging a wire rope, horizontally arranging a plurality of vertically hung ecological bases arranged on the steel wire rope in a horizontal direction, and allowing a gap to exist between the bottom of each ecological base and the bottom of the pond; S4, planting floating water plants with developed roots on the water surface; and S5, adding probiotics into the culture pond every 7-10 days. The method adopts a micro-porous aeration technology, erection of the crayfish crawling stairs, plantation of the water plants on the water surface and hanging of the ecological bases below the water surface to form a three-dimensional living place, so crayfish can inhabit and move at different water layers, the utilization rate of per unit of water body is increased, and the yield of crayfish culture is increased. The method belongs to the field of crayfish culture.

The invention relates to the technical field of fry hatching, in particular to a tilapia mossambica roe hatching circulation system. The system comprises a rack, a hatching pond, a temporary raising pond, a fry pond, hatching barrels, a temporary raising basin, a water storage pond and a water supply pond. By forming a hatching cavity, each hatching barrel can be cultured independently to preventdifferent roe feeding times of the hatching barrel. Egg envelope lytic enzymes released by roes without membranes input into the hatching barrel early to water enter the hatching barrel along with circulating water and roes are put in the hatching barrel to lead to membrane release of roes put in the hatching pond, so that the hatching rate is reduced; the content of dissolved oxygen in water is improved through water circulation, so that the hatching rate is prevented from being reduced as a result of oxygen deficit in the hatching process. The dosage of water can be reduced, so that the system is energy-saving and environment-friendly. By arranging the hatching barrels, the temporary raising basin and the fry pond on the rack to form a three-layered three-dimensional structure, an intactfry hatching culture process can be finished, so that the intermediate transfer links are reduced, the hatching efficiency is improved and the production cost is lowered.

The invention discloses a loach fry hatching device. The loach fry hatching device comprises a mounting rack, an upper barrel body and a lower barrel body, wherein both the upper barrel body and the lower barrel body are inverted conical structures, the upper barrel body is movably arranged on the mounting rack, an overflow groove is formed in the upper end of the upper barrel body, a screen mesh is arranged in the overflow groove and can completely cover an upper barrel body opening, a water outlet pipe is arranged at one end of the overflow groove and is connected with a water purifying device, a communicating pipe is arranged at the bottom of the lower barrel body and communicates with the lower barrel body, the lower end of the communicating pipe communicates with a fry outlet pipe and a water inlet pipe separately, the other end of the water inlet pipe communicates with the water purifying device, a fry outlet valve is arranged at the joint of the fry outlet pipe and the communicating pipe, a water inlet valve is arranged at the joint of the water inlet pipe and the communicating pipe, a concave circular baffle is arranged above the communicating pipe, a plurality of connecting bars are uniformly arranged around the circular baffle, and a plurality of aerators are uniformly arranged on the internal wall of the upper barrel body. According to the loach fry hatching device, through the cooperative action of the aerators and the circular baffle, the direction of water flow is changed, the amount of dissolved oxygen in barrels is increased, and the survival rate of hatching is increased.

The invention discloses a method for breeding red green crabs in a pond. On-line monitoring of pond water dissolved oxygen amount is started in 30-60 days before the red green crabs come into the market, a critical value is set, and when the pond water dissolved oxygen amount is lower than the critical value, an aerator is started to ensure that the pond water resolved oxygen amount is higher than the critical value. The critical value is 3.5mg / L to 4.5mg / L. Food containing astaxanthin is fed to the red green crabs in 30-60 days before the red green crabs come into the market, and each crab is made to intake more than 11.5g of astaxanthin. By means of the method, sufficient dissolved oxygen in the crab pond can be guaranteed, negative effects on astaxanthin deposition from changes of environmental factors are weakened, the organoleptic quality and the taste of the crabs in ponds can be improved, and therefore economical benefits of breeding crabs in the pond are increased. The method is simple in operation, easy to implement and low in cost.

The invention relates to a technology for synergistically increasing oxygen-containing groups in a charcoal material with ozone and ultraviolet irradiation. The technology mainly comprises the following steps: the prepared charcoal material is sieved, washed and dried, then is mixed with ozone, and is heated to 100-500 DEG C; the charcoal material is spread on a temperature-controlled electric hotplate, and is irradiated with an ultraviolet irradiation lamp having an ultraviolet ray wavelength of 10-380 nm for 24 h, the material is placed in an ozone contact column one time every 12 h, and ozone is introduced, wherein the temperature of the charcoal is kept at 200 DEG C in the irradiation process; and the charcoal material is dried after the ultraviolet irradiation is finished. The technology can significantly increase the quantity of the oxygen-containing groups in the charcoal material.

The invention solves the problems that the amount of dissolved oxygen in a water body is not quantified and the aeration time is not accurately controlled in the prior art. The invention provides an automatic aeration system for a water body. The automatic aeration system comprises a dissolved oxygen amount acquisition module, a control processing module, an aeration execution module and a data storage module, wherein the dissolved oxygen amount acquisition module is connected with the control processing module and provides dissolved oxygen amount data to the control processing module; the data storage module is connected with the control processing module and provides a dissolved oxygen amount threshold range to the control processing module; and the control processing module is connectedwith the aeration execution module and controls the aeration execution module to start or stop. According to an embodiment of the invention, aeration can be started or stopped immediately according to the change of the dissolved oxygen amount, so that a sufficient amount of dissolved oxygen in the water body is ensured, and the waste of electric power is reduced; and the upper limit of the amountof the dissolved oxygen in the water body can be adjusted in time according to current atmospheric pressure and air temperature, and the upper limit of the amount of the dissolved oxygen in the waterbody can be ensured to be reached every time when the oxygen is increased.

The invention belongs to the technical field of water treatment and water pollution prevention, and relates to a particle electrode and a preparation method thereof and a three-dimensional electrolytic reactor and application of the three-dimensional electrolytic reactor. The particle electrode is formed by loading g-C3N4 and TiO2 on activated carbon after g-C3N4 and TiO2 are compounded, wherein the mass of g-C3N4 accounts for 40%-50% of the total mass of a g-C3N4-TiO2 compound, and the particle electrode is a g-C3N4-TiO2 / AC particle with visible-light catalytic activity. The three-dimensionalelectrolytic reactor is filled with the g-C3N4-TiO2 / AC particle, the mass transfer effect of an upflow type fluidized bed is improved, the short circuit current is eliminated, and the current efficiency is improved; and under the conditions of the electric field and the illumination, the electrolysis reaction and the photocatalytic reaction generate synergistic effect on the g-C3N4-TiO2 / AC particle electrode, and the three-dimensional electrolytic reactor has a better treatment effect on nonbiodegradable matter.

The invention relates to a method for industrial breeding of elentheronema tetradactylum, and belongs to the technical field of fish breeding. The method comprises the following steps of 1, preparation of breeding conditions, wherein breeding circulation equipment is established for disinfection and comprises a breeding barrel which is circularly communicated with a sedimentation tank and a biochemical tank, and breeding water is recycled through the breeding circulation equipment and prepared by mixing natural seawater with tap water; 2, transportation and putting of fry, wherein fry with the length of 0.8-2.0 cm are selected for transportation, plastic bags which contain the breeding water and sufficient oxygen are adopted for transportation, carriers for adsorbing vegetable oil are added, environmental adaptation and disinfection treatment are carried out on the fry, and then the fry are put into the breeding barrel for breeding; 3, feeding management of fishes; 4, stress control and management of the fishes; 5, disease prevention and control of the fishes. The method can realize large-scale fry cultivation in sealed circulating water prepared from artificial seawater and in-situ breeding of adult fishes for elentheronema tetradactylum.

The invention discloses an ecological submerged dam system for urban landscape rivers and a construction method. The ecological submerged dam system comprises a submerged dam, an absorption basin, a water truck, submerged plants and a sludge discharge tank, wherein the absorption basin comprises an apron and a tail-weir; and the submerged dam and the absorption basin are constructed from bio-film forming stone net cages. Water falling from the dam top drives the water truck to rotate, and water in the absorption basin is continuously rolled up and drops, so that the water is fully doped with gas dissolved oxygen along the way, bio-film decomposition of eutrophic substances in the water is facilitated, and the produced sludge automatically converges into the sludge discharge tank so as to be discharged; and the residual eutrophic substances in the water are absorbed by the submerged plants at the tail-weir, and the water body is further purified. The construction method comprises the following steps: 1, cleaning the riverbed; 2, manufacturing the bio-film forming stone net cages; and 3, performing field installation and fixation. The discharged water is driven to be automatically doped with gas dissolved oxygen, the river water is continuously purified by adopting a bio-film process, phytoremediation and other ecological technologies, and the ecological submerged dam system has the advantages of being excellent in water purification effect, ecologically attractive, simple in construction, convenient to maintain, low in cost and the like.

The invention belongs to the technical field of aquaculture and relates to a circulatory temporary culture technology of aquatic products, in particular to a multilayer detachable aquatic product temporary culture system. The multilayer detachable aquatic product temporary culture system comprises a water treatment system, a refrigerating system, a spray system, an aeration system, a water collection tank and a temporary culture box. The multilayer detachable aquatic product temporary culture system is divided into a plurality of U-shaped temporary culture units which are independent from each other. The structure of the U-shaped temporary culture units facilitates operations of forklifts and other operational equipment. The temporary culture box can be subject to cordwood arrangement and detachment according to the space, and the operation is flexible and simple. The cordwood arrangement is of a double-pipe backwater structure, so that the water level and the water flow direction in the temporary culture box can be effectively controlled, sufficient circulation of temporarily cultured water in the system is ensured, and the closed circulating water temporary culture mode saves energy. The multilayer detachable aquatic product temporary culture system provides a new factory-like fresh aquatic product temporary culture mode with combined temporary culture units, mechanical operation and a modularized system, meets large-scale temporary culture industrial demands of factories, and has a wide market application space.

The invention belongs to the technical field of biology and provides an artificial spawning induction and insemination method for nibea albiflora. The method includes: in a nibea albiflora parent breeding period, feeding nibea albiflora parents with a prepared stable composition, and performing nutrition enhancement; after sexual maturity of the parents, artificially collecting spawns and semen tocomplete insemination and obtain inseminated spawns; hatching the inseminated spawns, and carrying out fry breeding. Before artificial spawn and semen collection, injecting the nibea albiflora parents with spawning induction hormones is avoided. By adoption of the artificial spawning induction and insemination method, the spawns and semen can be regulated to realize synchronous maturity finally,so that nonsynchronous and unsmooth spawning and semen discharging can be avoided, and after-spawning parent fish death loss is avoided; large spawning quantity of female fish and high semen quality of male fish are realized, and the hatching rate and the effective hatching quantity can be increased so as to increase fry output; the composition is stable and easy to preserve and is capable of increasing the fat, protein and total sugar accumulation in testes and ovaries to enable synchronous development and maturity of testes and ovaries of the parents, and the spawning amount of parental female fish is increased.

The invention discloses a double-layer artificial wetland system for strengthening sewage denitrification and dephosphorization and an operation method thereof. The system comprises an upper layer of wetland, a lower layer of wetland, a water inlet and distribution system and an effluent collection system, wherein the upper layer of the wetland is filled with mineral filler, and the lower layer of the wetland is filled with biologic filler which is favorable for microorganisms to adhere to grow; the water inlet and distribution system is divided into to two branches, wherein one branch is distributed above the upper layer of the wetland, and the other branch is distributed on the interface of the upper layer of the wetland and the lower layer of the wetland; and the effluent collection system is distributed on the bottom of the lower layer of the wetland. The method comprises: waterfall aeration is carried out on sewage by one branch of the distribution system, then the sewage falls into the upper layer of the wetland to remove organic matters, ammonia nitrogen, phosphorus and the like to vertically seep into the lower layer of the wetland; in order to supplement a carbon source, a small strand of sewage is introduced into the lower layer of the wetland by the other branch of the distribution system to be mixed with the sewage seeped from the upper layer of the wetland for denitrification; and water is discharged from the effluent collection device after being processed. The invention occupies small area, has small possibility of being blocked and has favorable denitrification and dephosphorization effects and low investment operation cost.

The invention relates to a water treatment system based on aeration control. The water treatment system at least comprises a biochemical treatment unit and a control unit used for performing aerationcontrol, wherein a plurality of aerators are built in the biochemical treatment unit in a mode of mutually parallel interval arrangement; the aerators are configured into a work mode of capable of rotating around a rotating shaft thereof so as to change the inclination angle with to the ground; under the condition that the inclination angle is reduced, a plurality of first size of bubbles generated by the aerators and other first size of bubbles are mutually blended in a proportion increase mode so as to form a plurality of second size of bubbles; the mutual ratio of the number of the first size of bubbles and the number of the second size of bubbles is increased along with the increase of the inclination angle. The water treatment system has the advantages that the mixed proportion of different sizes of bubbles is regulated by changing the inclination angle of the aerators; fillers can be maintained at the set fluidization movement speed; meanwhile, the sufficient dissolved oxygen isprovided for microbial growth.

The invention discloses an integrated experiment device for fish toxicity research and an operation method of the device. The integrated experiment device comprises a stored solution tank, a dilute solution tank, a reaction solution tank, a temperature controller, a temperature sensor, an aeration pump, an automatic controller and a water outlet tank, the stored solution tank is connected with oneside of a first peristaltic pump through a pipeline, the reaction solution tank is connected with the other side of the first peristaltic pump through a pipeline, a first time relay is arranged on the first peristaltic pump, the dilute solution tank is connected with one side of a second peristaltic pump through a pipeline, the reaction solution tank is connected with the other side of the secondperistaltic pump through a pipeline, a second time relay is arranged on the second peristaltic pump, the right end of the reaction solution tank is sequentially connected with a third peristaltic pump, a rotor flow meter and a water inlet through pipelines, a third time relay is arranged on the third peristaltic pump, and the right end of the water inlet is connected with an operation tank.

The invention discloses an intelligent crab and shrimp breeding box, and relates to the technical field of aquaculture. The intelligent crab and shrimp breeding box comprises a box body with through holes and a box cover, water flow can freely circulate inside and outside the box body, breeding bodies and activity areas are arranged in the box body, and a plurality of breeding nest holes are formed in the breeding bodies. The breeding nest holes are provided with entrances and exits allowing crabs and shrimps to freely enter and exit and internal spaces capable of containing the crabs and shrimps, and the activity areas are located outside the breeding bodies. The natural living environment of the crabs and shrimps is simulated, harm of fierce fishes, some birds, rats and other animals is avoided, handicapped behaviors of the same kind can also be reduced, catching damage to the crabs and shrimps is greatly reduced, and economic benefits are increased.