8results about How to "Reduce eutrophication" patented technology

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 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.

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.

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 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 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 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.