18results about How to "Reduce eutrophication" patented technology

The invention relates to the technical field of ecological breeding, in particular to an ecological breeding method based on a water ecological restoration system, which comprises the following steps: evaluating the water quality of a water area subjected to chemical restoration, evaluating the water pollution degree of the water area, and determining the water ecological restoration system according to the evaluation result of the water pollution degree of the water area. Calculating the maximum putting density of the target aquatic plants corresponding to the water area and the maximum putting quantity of the target microorganisms; finally determining the optimal putting proportion of the target aquatic plants and the target microorganisms in the water area; after the water area is put according to the optimal putting proportion of the target aquatic plants and the target microorganisms, a monitoring period is set, the water quality of the water area in the monitoring period is monitored, and the target aquatic plants and the target microorganisms are monitored according to the water quality monitoring result of the water area in the monitoring period. Adjusting the planting density of the target aquatic plants corresponding to the water area in the next monitoring period and the feeding quantity of the target microorganisms; the ecological balance of the water area can be recovered, the self-cleaning capacity of the water body can be improved, and a guarantee is provided for regional ecological safety.

The invention discloses a method for treating rural domestic sewage by using a constructed wetland. The method comprises the following steps: step 1, establishing a sewage collection tank; 2, flatly laying a first water outlet pipe on the surface layer of the left artificial wetland, and densely distributing water spraying holes in the bottom and two sides of a pipeline in contact with the artificial wetland; step 3, establishing a vertical baffling artificial wetland; 4, second desilting openings are formed in the two sides of the bottom of the constructed wetland correspondingly, and automatic valves are installed at the second desilting openings; step 5, establishing a reservoir which can temporarily store a part of water for artificial wetland desilting, fish and shrimp stocking or other living needs; 6, a second water outlet pipe is arranged on the side, away from the sewage collecting pool, of the top of the constructed wetland and communicates with the water storage pool, and water quality monitoring sensors are installed on the first water outlet pipe and the second water outlet pipe correspondingly; and step 7, harvesting overground plant parts as livestock foodstuff in winter every year so as to prevent the constructed wetland bed body from being blocked.

The utility model belongs to the field of aquaculture net cages, particularly relates to an aquaculture net cage, and aims to solve the problems that when an existing net cage is used for aquaculture of aquatic products, the aquatic products need to be fed, a large amount of bait is easily fed to one position of the net cage during feeding, part of the bait leaks out of the net cage, the bait is wasted, and the surrounding water environment is eutrophicated. According to the technical scheme, the box comprises a box body, the outer side and the corner angles of the four sides of the inner wall of the box body are all arranged to be arc-shaped, top plates are fixedly connected to the two sides of the top of the box body, a middle plate is fixedly connected to the center of the top of the box body, and a side plate is fixedly connected to one side of the box body; the corner angles of the middle plate, the side plates and the two top plates are all arranged to be arc-shaped, bait can be conveniently and evenly put into the box body, the bait is prevented from being concentrated at one position of the box body, then waste of the bait is reduced, the situation that the bait falls down from the box body can be reduced, eutrophication of water resources is reduced, and normal use of the water resources is guaranteed.

The application relates to a rice field water-saving irrigation and tail water treatment system and method, which comprises a main canal, branch canals, water distribution canals, ring ditches, gates, water flow monitors and water pumps. The main canal is connected with the branch canals, the branch canals are connected with the water distribution canals arranged between multiple fields, and branch gate is arranged at the intersection of the branch canals and the water distribution canals. Irrigation water flows into the branch canals from the main canal and then flows into the water distribution canals. Ring ditches are arranged around each field, inner gates are arranged at the intersections between the ring ditches, the inner gates are opened, irrigation water flows into the rice field along the ring ditches, the water distribution canals are connected with middle canals located in the middle of each field, the middle canals are connected with drainage ditches, and drainage gates are arranged at the connection positions. Due to the height difference between the ring ditches and the middle canals, tail water in the ring ditches is discharged into the middle canals through the water pumps, the drainage gates are closed, tail water gates at the intersections of the middle canals and the water distribution canals are opened, tail water in the middle canals returns to the water distribution canals, and the tail water is recycled for water-saving irrigation. The water-saving irrigation is achieved by using rice, and the treatment method has the same effect.

The invention relates to the technical field of eriocheir sinensis breeding, in particular to application of a new wheat-eriocheir sinensis ecological planting and breeding mode in improving the quality of adult crabs, which comprises the following steps: planting wheat in a field, digging ditches around to protect eriocheir sinensis, and performing field operation in the growth period of wheat; after wheat is harvested, straw is removed, then land is ploughed, and water is injected for grass planting; after 15 days, Chinese mitten crabs are bred in the wheat field; through a new wheat-eriocheir sinensis ecological planting and breeding mode, the maturity and quality of adult eriocheir sinensis are improved.

The invention discloses an urban water area sewage purification device, and belongs to the technical field of sewage treatment, the urban water area sewage purification device comprises a cylinder, the top of the cylinder is provided with an access cover, the side wall is connected with a water inlet pipe and a water outlet pipe, the water inlet is connected with a grating assembly, and the grating assembly is provided with a chemical agent supply mechanism; at least two submersible pumps are installed at the bottom in the barrel, the output ends of the submersible pumps are connected with pressure pipelines, and control valves and check valves are arranged on the pressure pipelines. An intelligent control cabinet is integrated on the top of the barrel and electrically connected with the liquid level sensor and the submersible pump. The grating assembly is arranged at the water inlet, large-particle impurities in sewage can be effectively intercepted, the impurities are prevented from entering the cylinder to block a pressure pipeline or abrade a submersible pump, the equipment fault occurrence rate is remarkably reduced, and the service life of the device is prolonged; meanwhile, the grid assembly and the chemical agent supply mechanism are arranged cooperatively, so that the agent can be fully mixed with the sewage subjected to preliminary filtration, the reaction efficiency of the agent is improved, and the subsequent purification effect is enhanced.

The utility model relates to the field of sewage treatment, and discloses an autotrophic total nitrogen removal sewage treatment system which comprises a reaction tank, an aeration disc, a sedimentation tank, a backwashing water tank, a water outlet tank, a water inlet pipe, a backwashing water pipe, an air pipe and the like. Because dead bacterial colonies or decomposition products of a denitrifying microorganism filter layer in the treatment tank can be continuously attached to filter materials of the filter layer along with the increase of treatment time, gaps among the filter materials are blocked, the flow rate of sewage passing through the filter materials is reduced, the speed is slowed down, the total nitrogen removal efficiency of microorganisms is continuously reduced, and the sewage treatment efficiency is improved. And finally, the effluent quality exceeds the standard. According to the invention, the filter material is scrubbed by mixing gas and water, so that attachments in the filter material are removed, the continuous production is ensured, the replacement period of the filter material is prolonged, and the use cost of the filter material is saved.

This utility model discloses a solar-powered aeration device for aquaculture. It relates to the technical field of aeration devices and includes: an aeration hull with a fixed frame, an aerator mounted on the fixed frame (located on the side wall of the fixed frame), a solar panel on the top of the fixed frame, and an air duct arranged in a ring around the fixed frame, with several air valves evenly distributed around the circumference of the air duct; a stainless steel frame located between the aeration hull and the fixed frame; and an auxiliary mechanism arranged in a ring around the stainless steel frame. This solar-powered aeration device for aquaculture, by having plant roots pass through root holes and fill them with soil, allows the surrounding vegetation to absorb nutrients such as nitrogen and phosphorus, as well as harmful substances, produced during aeration. This helps reduce eutrophication in the water, increases oxygenation, aids aquaculture, and prevents excessive algae growth caused by eutrophication from negatively impacting the water quality.

The invention provides a static water ecosystem restoration method, which comprises: S1, water body diagnosis: collecting a water sample, carrying out index analysis, and analyzing the transparency, the pH value and the nitrogen-phosphorus content ratio of the water body; s2, bottom mud improvement: analyzing the components of the bottom mud, and dredging the bottom mud with high heavy metal content and rich organic matters; S3, water quality improvement: putting a microbial complex microbial inoculant into water to quickly repair the water body; s4, aquatic plant restoration: selecting aquatic plant varieties according to conditions such as illumination, water depth and water quality of the water body; s5, animal restoration: selecting proper aquatic animal species according to the pollution degree and ecological status of the water body; s6, later maintenance and management: regularly detecting the water quality, trimming and replanting the aquatic plants, and controlling the population number of aquatic animals; through the operations, the rapid restoration of the water body is realized, and a set of complete water ecosystem can be established in the later period.

This invention relates to a deep-well pressurized coupled open-type enclosure ecological algae control system and its maintenance method. Enclosures are set up upstream and downstream of areas where dense algae residue has formed a sedimentation zone in the water body. These two enclosures, together with the riverbed, form an open ecological zone. The algae control well is located at the front end of the upstream enclosure. Blue-green algae enters the well from the inlet of the inner cylinder, loses its buoyancy after being subjected to hydrostatic pressure, and then a flow-propelling device pumps the algae-laden water through the return channel between the outer and inner cylinders into the water body of the ecological zone. The blue-green algae disperses in the water, and filter-feeding fish and benthic organisms filter-feed the algae residue throughout the ecological zone, resulting in high algae residue treatment efficiency. A trolley device moves a driving net from a first position to a second position on the track. The driving net, with its shape conforming to the water body cross-section and utilizing the fish's upstream swimming habits, drives adult fish from downstream to upstream. An air-floating net cage inflates and floats, enclosing the driving net and the fish within a second net body, saving costs and achieving high automated capture efficiency.

The invention provides a compound fertilizer for zizania aquatica planting and a preparation method thereof. The preparation method mainly comprises the following steps: (1) preparation of calcium peroxide nanoparticles; (2) preparation of a fertilizer core; (3) preparation of a coating agent; the compound fertilizer prepared by the invention has good slow release performance and certain biodegradability, and can provide oxygen for a long time while improving the utilization rate of the fertilizer, so that water eutrophication caused by excessive fertilizer is relieved, and the yield and quality of zizania aquatica are successfully improved.

The invention discloses a natural landscape revetment and a construction method thereof, and belongs to the technical field of landscape engineering, and the main body structure of the revetment sequentially comprises a rammed earth layer, a soil layer layered rolling layer and a sandy soil layer from bottom to top; 3-5 pieces of decoration scene stone are arranged in an upstream proper area every 12-15 m; a 2.5-3.5 m aquatic plant planting area is arranged in the midstream; the method comprises the following steps: arranging a wood pile at the downstream, arranging sandy soil, a wood bundle and the wood pile at the upstream area of the wood pile, adopting wickers of 1-5cm and 40-50cm in length as the wood bundle, nailing the wood pile into the soil by 1.5 m according to the distance of 1m, scion, and binding the wood bundle and the wood pile. According to the revetment, natural elements and ecological functions are combined, the construction method is simple and feasible, the stability of the revetment can be effectively enhanced, meanwhile, the attractive and natural landscape effect is created, and good ecological benefits and landscape value are achieved.

The utility model discloses an efficient integrated town sewage treatment device which comprises an adjusting tank, an AAO (anaerobic-anoxic-oxic) sewage treatment mechanism is arranged at the rear end of the adjusting tank, and a sedimentation tank is arranged at the rear end of the AAO sewage treatment mechanism; the pre-denitration tank is arranged at the front end of the AAO sewage treatment mechanism, an anaerobic tank is arranged at the rear end of the pre-denitration tank, an anoxic tank is arranged at the rear end of the anaerobic tank, an aerobic tank is arranged at the rear end of the anoxic tank, and conveying pipes are arranged among the adjacent pre-denitration tank, anaerobic tank, anoxic tank and aerobic tank; a first suction pump is mounted outside the conveying pipe; the aeration header pipe is arranged on one side of the AAO sewage treatment mechanism, an air blower is installed at one end of the aeration header pipe, and a first aeration branch pipe and a second aeration branch pipe are arranged at the air outlet end of the aeration header pipe respectively. And pollutants such as nitrogen and phosphorus in water are difficult to effectively remove.

The present application belongs to the technical field of shrimp, crab, shellfish and fish three-dimensional ecological aquaculture method, especially to a shrimp, crab, shellfish and fish three-dimensional ecological aquaculture method using ecological niche complementation, a salt pond in intertidal zone is selected, a culture salt pond with an area of more than 500 mu is constructed, the culture salt pond is 400-450 m wide from east to west, 850-950 m long from south to north, and 3.0-3.2 m deep, a ring ditch is excavated around the culture salt pond, a central ditch with the same direction as water inlet and outlet is excavated in the center, a shellfish bed is arranged between the ring ditch and the central ditch, and the slope ratio of water inlet to water outlet is 1.8:1.0.

The present application relates to the technical field of hydraulic engineering and water resources management, and discloses a method for detecting water delivery capacity and increasing flow in gentle terrain. The method first acquires terrain elevation data of the target area, extracts terrain feature points to construct a terrain parameter model and generate an initial water flow path, and calculates the initial water delivery capacity based on a water flow distribution model simulated according to historical hydrological data. Then, real-time water flow dynamic data are collected, the water flow path is iteratively corrected, the water delivery capacity is recalculated, and the gap is determined. Subsequently, the flow-increasing area is selected according to the gap, and flow-increasing measures such as excavation of diversion channels or setting of temporary water storage structures are planned, and the flow-increasing effect is verified after implementation. This method can accurately detect the water delivery capacity, plan targeted flow-increasing measures, effectively improve the water delivery capacity, reduce costs, and protect the ecological environment, and is suitable for various water delivery scenarios, and has good universality and expandability.

The invention discloses a preparation method of a phosphorus-free corrosion and scale inhibitor for highly corrosive water, which comprises the following steps: S1, mixing and gelatinizing natural polysaccharide and distilled water in an inert gas environment; s2, cooling the gelatinization system obtained in the step S1 to a certain temperature, adding an unsaturated monomer, stirring to be stable, adding an initiator solution, stirring, and carrying out graft copolymerization reaction; s3, cooling the reaction system in the step S2 to room temperature, adding absolute ethyl alcohol, standing, filtering and drying to obtain a grafted crude product; s4, performing Soxhlet extraction on the grafted crude product by adopting an organic solvent to obtain a refined grafted product; and S5, stirring and dissolving the refined grafted product and a metal corrosion inhibitor aqueous solution, and uniformly mixing. On the basis of not influencing the performance of the water treatment agent, the prepared non-phosphorus corrosion and scale inhibitor has the characteristics of no phosphorus, safety, greenness, environmental protection and the like.

The invention provides a rainwater collecting, purifying and filtering device which comprises a rainwater collecting box and a rainwater purifying module located in the rainwater collecting box, the rainwater collecting box internally comprises two filtering bins and two settling bins, the two filtering bins are the first-stage filtering bin and the second-stage filtering bin respectively, and the two settling bins are the first-stage settling bin and the second-stage settling bin respectively; the first-stage filtering bin and the first-stage settling bin are arranged up and down and embedded in the right end of the rainwater collecting box, the second-stage filtering bin and the second-stage settling bin are arranged up and down and embedded in the left end of the rainwater collecting box, a partition plate is arranged between the first-stage filtering bin and the second-stage filtering bin, and an inclined guide groove is formed in the upper end of the first-stage filtering bin; the aeration assemblies are used for disturbing generation of algae, and one aeration assembly is located in the inclined guide groove. In the rainwater collection process, the problems that large particles in collected sewage containing rainwater are prone to blocking the purification module, and the collected water cannot be monitored in real time, and the quality of filtered water cannot be adjusted are solved.

The utility model provides a portable denitrification device which comprises a treatment tank, the treatment tank is installed on a base, a hand-held frame is arranged on the base, idler wheels and foot cups are arranged at the lower end of the base, the interior of the treatment tank is divided into a clear water area, a denitrification area and a water distribution area from top to bottom, the input end of the water distribution area is connected with a sewage inlet pipe, and the output end of the water distribution area is connected with a sewage outlet pipe. The output end is connected with a sewage inlet pipe, a self-priming pump is arranged on the sewage inlet pipe, the clear water area is connected with a clear water outlet pipe, and a water return pipe is arranged between the sewage inlet pipe and the clear water outlet pipe. The sewage treatment device can be easily carried to different places for use and is not limited by places, sewage can be circulated in the treatment tank for denitrification reaction, the total nitrogen content in the sewage can be effectively reduced, and the sewage treatment device is of great significance in improving water quality and relieving water eutrophication.