86results about How to "Reduce nitrogen and phosphorus content" patented technology

The invention discloses a device and a method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater, which belongs to the technical field of water pollution control. The device is arranged after secondary wastewater treatment, and nutrient elements of nitrogen, phosphorus and the like can be absorbed by the photosynthesis of algae cells, and thus, the nitrogen and phosphorus concentration in secondary wastewater treatment effluent can be further reduced, thereby lowering the risk of water bloom eruption because the sewage plant effluent is discharged behind scenic water; the device can be applied to the deep treatment of the wastewater. The growth rate of the algae cells and the nitrogen and phosphorus removal rate can be increased by taking Scenedesmus sp.LX1 as a nitrogen and phosphorus removal dominant algae by adopting an LED red and blue light source; and the algae density in a reactor and the nitrogen and phosphorus removal can be increased by adopting a membrane separation mode and a dense algae liquid reflux mode. Meanwhile, grease can be further extracted by separating the obtained dense algae liquid, and the wastewater is taken as the resource to produce the biological oil. The method has the advantages of good nitrogen and phosphorus removal effect, high economic benefit and the like.

The invention discloses a method for treating nitrogen and phosphorus surface source pollutants in an ecological ditch. The method comprises the following steps of: A, constructing the ecological ditch: constructing the ecological ditch at the exit of a catchment area, and dividing the ecological ditch into multiple steps, wherein the slope and the bottom of the ditch are made of soil, and a water blocking bank has a brick-concrete structure; B, planting aquatic plants and breeding loaches section by section: planting the aquatic plants in the ecological ditch to digest the nitrogen and phosphorus surface source pollutants in a water body by using the intercepting and absorbing effect of the aquatic plants, and breeding the loaches on the lower middle part of the ecological ditch to increase economic benefits of the ecological ditch; C, managing the ecological ditch: periodically reaping the aquatic plants, dredging the ecological ditch in combination with harvesting of the loaches, and newly planting aquatic plants and breeding loaches; and D, managing and maintaining the ecological ditch: 1) reaping and utilizing the plants in the ditch, 2) dredging, and 3) maintaining the ecological ditch. The method is low in cost and easy to operate, is easily accepted by crowds, has an extremely good treatment effect on the nitrogen and phosphorus surface source pollutants, and has a very good popularization and application prospect in subtropical hilly regions of middle and lower reaches of the Yangtze River.

The invention provides a paddy field recession water purification device placed in a ridge of a field. The paddy field recession water purification device is characterized in that a framework of a single water purifying device is constructed by using reinforcing steel bars with the diameter of phi10, plastic plates are arranged at two sides of the framework, steel wire meshes are arranged at the other four faces of the framework, a plastic gate is arranged at the front end of the framework, the interior of the device is partitioned into a part A and a part B by steel wire meshes with fine density, the volume ratio of the part A to the part B is 2: 1, the steel wire mesh of the part A is a high-density steel wire mesh and is filled with bio-filler balls, the steel wire mesh of the part B is a fine-density steel wire mesh and is filled with activated carbon, the front and rear faces of the single water purifying device are designed to be openable, and the single water purifying device or two single water purifying devices are placed in the ridge of a drainage end of the paddy field and are fixed by wood piles. The paddy field recession water purification device has the advantages that the traditional drainage manners that the traditional paddy fields directly drain paddy field recession water through opening gates and the water is not purified are improved, and harmful substances, such as nitrogen, phosphorus, organic substances and hardly-biodegradable pesticide residues, can be effectively trapped from recession water of cultivated field.

The invention discloses a method for treating aquaculture wastewater. The method comprises the following steps of: performing modular processing on wastewater by using microalgae and beneficial bacteria; and throwing snails, filter-feeding fishes and other aquatic animals into a water body to realize self-purification of an aquaculture water environment after the modular processing. Dominant and beneficial microalgae such as diatom, green algae and the like capable of absorbing nitrogen and phosphor in the aquaculture water body are screened out, inoculated, rapidly cultured and put into the aquaculture water body; the water color is regulated and the alga concentration is controlled by the methods of rational fertilization and rotifer inoculation; the beneficial bacteria are bacillus and photosynthetic bacteria capable of degrading organic matters and ammonia nitrogen in the water body; the beneficial bacteria and feed are proportionally mixed before the feed is put into the water body; after the feed is put into the water body, an underwater biomembrane taking the feed as a matrix is formed; the nitrogen, the phosphor and other harmful pollutants in the aquaculture water body can be effectively removed by jointly using the microalgae and the beneficial bacteria; simultaneously, the utilization efficiency of the feed can be improved by mixing the beneficial bacteria and the feed; and the water body is processed by using the microalgae and the beneficial bacteria, and then the snails and the filter-feeding fishes are put into the water body to prevent excessive multiplication of phycomycete, so that the self-purification of the aquaculture water environment can be realized.

The invention discloses a campus rainwater ecological cleaning integrated-processing method and an ecological cleaning integration system. The method comprises the following steps: 1) establishing an integration processing system for processing campus rainwater in a campus in advance; 2) selecting a proper processing method according to ecological purification conditions of different water bodies in the campus; and 3) finally collecting rainwater processed in the step 2) to a landscape water body in the campus, or discharging into a river in the campus, or collecting into the underground water layer of the campus. The system comprises an undercurrent type artificial wetland system for processing campus initial-stage rainfall runoff, a shoreland-area closure system for processing campus storm runoff, an ecological floating bed-aeration plug-flow system for processing campus natural revetment river water body, an artificial waterweed-micropore aeration system for processing campus hard revetment river water body, and a biomanipulation-fountain aeration system for processing campus enclosed pond water body. The beneficial effects comprise that the purification effect is good, the cost is low, the resource utilization rate is high and the purification effect is lasting.

The invention discloses a method and a system for treating agricultural non-point source pollutants in a hilly area by multilevel wetlands. The method comprises the following steps: A, designing and constructing a diversion facility and multilevel wetlands (including a grit chamber and drop water dams); B, configuring plants in ecological wetlands; C, stocking fish in wetlands; and D, managing and maintaining the ecological wetlands: 1) cutting and utilizing the wetland plants; 2) desilting; and 3) harvesting the fish. The diversion facility is connected with the grit chamber through a diversion covered channel / tube, the grit chamber is respectively connected with the diversion covered channel / tube and the first level wetland, the third level wetland is connected with the second level wetland and the fourth level wetland respectively through overflow channels, a wetland total water drainage opening is respectively connected with the fourth level wetland and a water drainage ditch, and all the wetlands are connected with the drop water dams through overflow channels. The method and the system have the advantages of low running cost, simplicity in operation, excellent treatment effect on non-point source pollutants nitrogen and phosphorus in a small basin or catchment area unit, and very good promotion and application prospect in subtropical hilly areas in the middle and lower reaches of the Yangtze River.

The invention relates to a water circulating ecological system for aquaculture. The water circulating ecological system comprises an aquaculture main body ecological breeding tank, a biological purifying tank, a water purifying tank and a residue treatment ecological breeding tank. Environmental engineering for ecological breeding is constructed by the water circulating ecological system, and the breeding environment is controlled and optimized, so that aquaculture breeding dirt is cleared up by virtue of ecological mating of microorganism, plants and animals, and therefore, water self-cleaning effect of an ecological environment is achieved. By virtue of a recycling economy mode, the water is self-cleaned and utilized in a multi-stage manner to form an industrial chain of a plurality of products, so that duplex economic value added effect is produced. The production system ecologically controls the aquaculture, so that breeding water can be saved for over 70%, and water quality is regulated and optimized, and therefore, healthy aquaculture is implemented.

The invention discloses a processing device and a processing method applicable to high-ammonia-nitrogen agricultural wastewater, and belongs to the field of processing of agricultural wastewater. According to the processing device and the processing method, a cylindrical electrolytic bath is arranged between an anaerobic sludge bed and a tower-type biological filter, and has a significant buffer effect on pollution load of the agricultural wastewater; at the same time through the arrangement of a return system and a two-phase denitrifying tank, the water quality of effluent water and the stable operation of the system can be ensured; biogas produced by the anaerobic sludge bed can be reused into the two-phase denitrifying tank, not only carbon emissions to the environment can be reduced, but also the denitrification rate of the two-phase denitrifying tank can be improved through utilization of anaerobic denitrification effect of methane, recycling utilization of waste matters can be realized, and the concept of green environmental protection can be embodied. The processing device is convenient to operate and easy to maintain, has relatively low construction costs and maintenance costs, and has good popularization and application value.

The invention provides a preparation method of a wetland plant and pig manure composite biochar, and an application of the composite biochar in the adsorption of heavy metals in water. Typical wetlandplants of Poyang Lake are selected, the aerial parts of the wetland plants are harvested in the growing season, pig manure is obtained from a pig farm, the collected wetland plant biomass is washed with water, dried and crushed, the pig manure is dried and crushed sequentially, and the plant biomass and pig manure biomass are mixed according to a ratio 1:1 to form a mixed biomass; chitosan and alkali residues are dried, and are crushed and mixed according to a mass ratio of 1:1; the mixed biomass and the obtained chitosan and alkali residue powder are mixed according to a ratio of 10:1 to prepare a composite biomass; and the composite biomass is added to an iron solution, anaerobic hydrothermal carbonization is carried out to form the composite biochar, and the composite biochar is used for adsorbing heavy metals in water. The preparation method fully utilizes several typical wastes in the Poyang Lake basin, achieves the purpose of treating pollution with wastes, and also has the advantages of wide sources of raw materials, low cost, simplicity, and easiness in operation, and the prepared biochar adsorbent is nontoxic and harmless, and is friendly to the environment.

The invention discloses a system and a method for controlling non-point source pollution and recycling nitrogen and phosphorus of paddy fields, belonging to the technical field of pollution prevention. The system comprises a water collection unit, a grid filtering unit, a buffer unit, a nitrogen-phosphorus adsorption unit, a flow on-off control unit, an artificial wetland, a natural water storage facility and a water conservancy recharge unit. When water is drained from the paddy fields, water sequentially flows through each unit, phosphorus and nitrogen are adsorbed through nitrogen-phosphorus adsorption substances and are absorbed by the artificial wetland, so that the contents of nitrogen-phosphorus substances are further reduced, and the purpose of reducing the eutrophication of a water body is achieved; when the paddy fields are irrigated, water enters irrigation channels through the adsorption unit, absorbed substances nitrogen-phosphorus substances are released into irrigation water through desorption and are reused in the paddy fields. Compared with the prior art, the system and the method have the advantages that when the water body pollution is maximally controlled, the recycling of the nitrogen-phosphorus substances and the harmony between the facility and the nature are realized, and the purposes of controlling the pollution and saving the fertilizer applying cost are achieved.

The invention relates to a macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof; the macromolecular biochar spheres are a spherical support formed under specific conditions by adding a macromolecular polymer to biochar that serves as a main material; microalgae and biochar spheres are mixed in a certain ratio, microalga-secreted extracellular polymer is used as a binder under the cooperation of lighting, nutrition and the other conditions, the binder reacts with developed pores in the surfaces of the biochar spheres to adsorb micrometer-level microalgal cells, and accordingly, the advantage of the biochar spheres to quickly adsorb heavy metals in wastewater is made full use, it is possible to further enrich the heavy metals in mixed wastewater via growth and metabolism of algal cells so as to consume nitrogen, phosphorus and other eutrophic nutrients in the wastewater. The method allows the nitrogen and phosphorus in wastewater to be effectively removed and heavy metals to be also removed, and has the advantages of zero secondary pollution, good production process simplicity, good availability and the like.

The invention relates to a mariculture wastewater treatment system and treatment method. The mariculture wastewater treatment system comprises a slanting board sedimentation pool and a three-section nitrogen and phosphorus removal pool which communicate with each other, wherein the three-zone nitrogen and phosphorus removal pool comprises a water distribution area, an anoxic zone, an aerobic zone, a phosphorous removal zone and a water collection area which are arranged in sequence, the anoxic zone is filled with gravel substrates, the aerobic zone is filled with zeolite substrates and equipped with a perforated aerator pipe, the phosphorous removal zone is filled with phosphorous removal functional filler substrates, a water inlet pipeline is arranged at the bottom end of the slanting board sedimentation pool, the top end of the slanting board sedimentation pool communicates with the water distribution area, the water collection area is equipped with a water outlet pipeline, and a return pipeline is arranged between the water collection area and the water distribution area, so that part of treated water is conveyed back to the water distribution area through the return pipeline. Compared with the prior art, the turbidity and the content of soluble COD, nitrogen and phosphorus in water can be reduced simultaneously, an A / O biological contact oxidation technology and an adsorption phosphorous removal technology are combined creatively to be applied to the field of seawater treatment, and the problem about large-scale purified emission of mariculture wastewater is solved.

The invention discloses a method I for culturing haematococcus pluvialis, a method II for improving biomass of haematococcus pluvialis, a method III for producing astaxanthin and a method IV for purifying domestic sewage. Through utilization of the method II, the biomass of haematococcus pluvialis can be greatly increased, haematococcus pluvialis can relatively quickly enter the astaxanthin synthesis period, the astaxanthin synthesis period can be greatly shortened, and good basis can be provided for follow-up increase of metabolite astaxanthin yield. Besides, the content of heavy metal and other pollutants in haematococcus pluvialis obtained by utilizing the method I is not obviously increased, so that the haematococcus pluvialis obtained by utilizing the method I can be used as a safe product for follow-up use. Meanwhile, through utilization of the method IV, the nitrogen content and the phosphorus content in sewage can be obviously reduced, and the sewage eutrophication degree is obviously relieved.

The invention provides a water body repairing system and a water body repairing method, wherein the system includes a power supply system, an aerating system, submerged plants, aquatic animals, an artificial medium, an electrolytic tank and a resistor. The power supply system is respectively connected to the aerating system and the electrolytic tank and supplies power to the aerating system and the electrolytic tank. The artificial medium includes a fixing device and an iron-carbon combined carbon fiber medium arranged thereon. The iron-carbon combined carbon fiber medium includes an iron material and carbon fibers suspended thereon and is connected to the aerating system through the resistor. The electrolytic tank is arranged within an aerating range of the aerating system. The submerged plants, the aquatic animals and the artificial medium are dispersed in a water body to be repaired. The water body repairing system can inhibit reproduction of alga, is enhanced in degradation capability on algal toxin and is improved in water body purification performance.

The invention discloses a nitrogen-phosphorus non-point source pollution control and recycling system and method for a farmland, and relates to the field of agricultural environmental protection. The system comprises: a main ridge arranged around the farmland, branch ridges arranged inside the farmland vertically and horizontally, and an aquatic plant cultivation trench arranged around the main ridge, wherein green plants are cultivated on the main ridge and the branch ridges respectively, and aquatic plants are cultivated in the aquatic plant cultivation trench; multiple pipelines are buried in earth between a water collection facility and the aquatic plant cultivation trench; a filtration adsorption facility is a filtration adsorption tank, and comprises a first buffer area, a filter screen, a nitrogen-phosphorus adsorption material and a second buffer area; a water suction pump is arranged in the first buffer area, and a water pump is arranged in the second buffer area; a water storage facility is a reservoir, and a drain valve is arranged on the water storage facility. According to the nitrogen-phosphorus non-point source pollution control and recycling system and method for the farmland, agricultural non-point source pollution can be better controlled, and nitrogen-phosphorus elements can be effectively recycled.

The invention aims to provide a solar energy water body ecological restoration floating bed system. Through a floating plate system, a water body is subjected to a photoelectrocatalysis function to degrade organic matters in the water body, in addition, an electric field can be added to accelerate phosphorus in the eutrophication water body to be degraded into a phosphoric acid state, and phosphoric acid is conveyed to a volatile gas adsorption area, phosphoric acid is mixed with ammonia nitrogen separated from the water body in an aeration stripping process, insoluble-state nitrogen and phosphorus, including struvite and the like, can be formed under the function of magnesium ions in modified zeolite, and the contents of nitrogen and phosphorus are further lowered under the action of aquatic plant; aerobiotic, anoxia and anaerobic biochemical systems are combined to carry out overall treatment, a new system is provided for effectively solving the problem of water body eutrophication,and water body restoration is achieved fundamentally.

The invention relates to the field of sewage treatment and discloses a distributed domestic sewage integrated treatment device and treatment method. The distributed domestic sewage integrated treatment device comprises a water inlet pipe (13), an aeration device (14) and a housing (1), wherein the interior of the housing (1) is divided into an anaerobic reaction chamber (2), an aerobic reaction chamber (3) and an artificial wetland chamber (4) by a first porous partition plate (5) and a second porous partition plate (6), a perforated water distribution pipe (7) is arranged in the anaerobic reaction chamber (2), the water inlet pipe (13) is connected with the perforated water distribution pipe (7) and the anaerobic reaction chamber (2) is filled by an anaerobic filler (9); an aeration pipe (8) is arranged in the aerobic reaction chamber (3), the aeration pipe (8) is connected with the aeration device (14) and the aerobic reaction chamber (3) is filled by a foam block (10); the artificial wetland chamber (4) is filled by a planting matrix (11)and aquatic plants (12) are planted on the planting matrix (11). The distributed domestic sewage integrated treatment device disclosed by the invention has the advantages of compact structure, low equipment and operation cost and obvious treatment effects.

A method for purifying water quality by net cage grass breeding achieves deep purification for urban sewage and aquatic flowers and vegetables plantation in lakeside. Its advantages include to improve water quality and environment, and to realize non-foaming oxygen supply.

The invention discloses a water purifying device of regenerated water supplied lakes and a construction method thereof. The water purifying device comprises a water purifying box and a mud adsorption device. A retaining wall is arranged on the water purifying box. The top end of the retaining wall is provided with a water baffle plate. A purifying cavity, a water storage cavity, and a mud filtering cavity are arranged in the water purifying box. The bottom end of the retaining wall is provided with a water gate. The mud adsorption device comprises a dredging pipeline, a baffling device, and a water suction pump. The baffling device is fixedly connected to the end part of the dredging pipeline. The construction method comprises the following steps: (1) carrying out setting-out survey; (2) digging a ground pit; (3) installing a frame support; (4) installing pipe channels; (5) pouring concrete; (6) installing a water purifying box; (7) installing a mud adsorption device; and (8) performing trial run of water purification. The construction steps are simple, the dam is protected, the construction efficiency of water purifying device is improved, and the water purifying device is suitable for lakes with different sizes.

A method for preparing garbage enzyme from fruits includes the following steps: washing the fruits and the fruit peels, performing pretreatment, and adding the fruits and water into a container in a weight ratio of 2:5; adding bacterial strain into the container wherein the mass of the bacterial strain is 10%-20% of that of the feed liquid, adding sugar into the container wherein the mass of the sugar is 20% of that of the feed liquid, fermenting continuously for 30-45 days, and filtering the product to remove the suspended matter in the upper level. The obtained liquid after filtering the product is garbage enzyme, and the obtained residue after filtering the product is garbage enzyme residue. The preparation method is simple, has easily available and cheap making material, has an effect on reducing the nitrogen and phosphorus content in eutrophic body of water of city watercourse, and can remove water eutrophication to improve the water quality and water impression.

The invention discloses a method for fishpond water body eutrophication remediation and belongs to the technical field of water body ecological remediation methods. The method comprises the steps that water in a fishpond is discharged out, and fish grooves are formed by excavating at three sides of the fishpond 2-3 meters from pond bank feet; in the first ten-day period of June, rice sprouts which just sprout are subjected to direct seeding at a central platform zone; in the first ten-day period of July, fish summerlings which are regular in specification are bred in the fish grooves; during rice growing, the water level is adjusted according to a rice fertility process, and the deepest water level reaches 1.2 m-1.4 m; during growing of the fish summerlings, fodder is thrown into the fish grooves; in the mid-to-late October, rice is harvested; and in May of the next year, adult fish is harvested. According to the method, nitrogen and phosphorus content in aquatic water in a high-temperature season can be obviously lowered, damage to yellow catfish growing is lowered, the yield and the quality of yellow catfish can be obviously improved, meanwhile, high-quality rice can be produced from rice used in the method, compared with the existing remediation technology, the method is economical and effective, sustainable development capacity is high, and the method is accepted by a large number of yellow catfish farmers.

The embodiment of the invention provides a baking-free ecological brick made of waste subway engineering mud and a making method of the baking-free ecological brick and aims to solve the problem thatin the prior art a baking-free brick made of waste subway engineering mud cannot meet use standards because of a too high water content. The baking-free ecological brick comprises the following components in parts by weight: 60-80 parts of waste subway engineering mud, 7.5-20 parts of a dewatering agent, 12-25 parts of a monopotassium phosphate solution and 0.5-2.0 parts of borox. The making method comprises the following steps: putting a dewatering agent with overburnt magnesium oxide into the waste subway engineering mud, and carrying out uniform stirring so as to obtain a mixed material A;putting a monopotassium phosphate solution and borox into the mixed material A, and carrying out uniform mixing so as to obtain a mixed material B, wherein the water content of the mixed material B is22-30%; carrying out coextrusion on the mixed material B so as to obtain a primary brick block; and maintaining the primary brick block for days in an environment of which the temperature is 18-22 DEG C and the RH (relative humidity) is greater than or equal to 65%, so as to obtain the baking-free ecological brick.

The embodiment of the invention discloses a method for reducing nitrogen and phosphorus in a eutrophic water body. According to the method disclosed by the embodiment of the invention, daces, chubs, crucians and weevers in an appropriate proportion are put in the water body which is rich in the nitrogen and the phosphorus according to different feeding habits of the fishes, the number of fish fries in the water body is controlled, the content of the nitrogen and the phosphorus in the eutrophic water body are reduced, the eutrophication problem of the water body is solved, a mass of human and material resources are not needed, and the labor intensity and the economic cost are reduced; an additive does not need to be added; secondary pollution on the water body cannot be caused, and not only is the eutrophication problem of the water body solved, but also a certain economic benefit can also be increased; the period of reducing the content of the nitrogen and the phosphorus in the water body is short, the effect is good, and the application range of the method is wide.

The invention discloses a method for ecologically remedying water by utilizing aizoon stonecrop. The method particularly comprises the following steps: planting aizoon stonecrop on an ecological floating bed; and placing into water to be remedied so as to ecologically remedy the water to be remedied. Nutrient substances such as nitrogen and phosphorus in culture water are absorbed by the aizoon stonecrop, so eutrophication of the water is avoided and the nitrogen content and the phosphorus content of the culture water are reduced; and economic benefit is obtained by harvesting and selling the aizoon stonecrop periodically. By the method, the problem that the culture water is deteriorated can be effectively solved and the culture ecological environment is recovered. Harmony and unity of environmental benefit and economic benefit are realized by harvesting the aizoon stonecrop to serve as a medicine material and high-economic-value vegetable.

The invention discloses a method for treating black and odorous water. The method for treating the black and odorous water comprises the following steps that 1, a micro-electrolytic material is addedto sludge of the black and odorous water and mixed with the sludge of the black and odorous water, wherein the dosage of the micro-electrolytic material is 0.5% of the weight of the sludge of the black and odorous water; 2, a saturated sodium carbonate solution is put into the sludge of the black and odorous water, wherein the dosage of the saturated sodium carbonate solution is 300-450 ml / m<2> according to the bottom area of a sludge layer; 3, microalgae are put into the black and odorous water for cultivation, and oxygen generated by the photosynthesis of the microalgae is dissolved in the black and odorous water; 4, water in the black and odorous water and external air are sucked by a jet pump to form an air-water mixture, the air-water mixture is released into the original black and odorous water to aerate the black and odorous water. The sludge in the black and odorous water and the black and odorous water itself are improved without transferring water or sludge of the black and odorous water, the improvement effect is good, and the efficiency is high.

The invention discloses an ecological floating bed fishing system suitable for an agriculture drainage ditch, which comprises an ecological floating bed provided with a handle for fishing. A mechanized fishing device includes a base, a sleeve, a foundation pillar, a cross bar, a fixed pulley, a steel wire rope and a hook body, wherein the base is fixedly arranged on the ground. The sleeve is rotatably arranged on the base. One end of the foundation pillar is connected to the inside of the sleeve and the surface of the other end of the sleeve is provided with a groove. The cross bar can be movably connected to the groove of the foundation pillar in an inserting mode and the tail end of the cross bar is fixedly provided with the fixed pulley. The fixed pulley is provided with the steel wirerope and the tail end of the steel wire rope is fixed with the hook body. The ecological floating bed fishing system suitable for the agriculture drainage ditch is strong in operability, low in cost and convenient for disassembly and replacement, has good effect to reduce water non-point source pollution of channels, can achieve a wide range of fishing by using a rotatable structure, is suitable for field operation, and can conveniently and efficiently fish and throw in the ecological floating bed.

The invention discloses a device for reducing urban riverway spray burst. The device comprises riverway fixing rods which are symmetrically arranged along a riverway, wherein roadbed fixing rods are arranged in parallel on the outer sides of the riverway fixing rods; a plurality of cultivation units are mounted on the riverway fixing rods; the cultivation units comprise cultivation net curtains and riverway slide bars I perpendicular to the riverway fixing rods; the left and right sides of the cultivation net curtains are connected with the riverway slide bars I; the front and rear ends of theriverway slide bars I are connected with roadbed slide bars I, so that the cultivation units are moved from the left to right along the riverway; a plurality of flowerpots are arranged on the cultivation net curtains; and a plurality of small holes are formed in the bottoms of the flowerpots. The device disclosed by the invention is long in use duration, high in control efficiency and obvious ineconomic and ecological benefits, has excellent social benefits and accords with a mainstream development direction of the ecological model.

The invention belongs to the technical field of agricultural environmental protection, and discloses a fertilization method capable of reducing nitrogen and phosphorus loss in a paddy field and application thereof. The fertilization method utilizes milk vetch returned to field to replace chemical fertilizers, and combines a specific fertilizer application manner, so that the nutrient release rateof nitrogen and phosphorus input in a paddy field is slowed down by organic replacement of chemical fertilizers while reducing input amount of chemical fertilizers, thereby further reducing nitrogen and phosphorus content in floodwater in a paddy field in a paddy growth period, to greatly reduce the risk of nitrogen and phosphorus loss in a paddy field from the source and decrease a series of environmental problems caused by the loss of nitrogen and phosphorus in a paddy fields, thereby giving significant environmental benefits. The fertilization method of combined application of organic and inorganic fertilizers adopted by the invention can also improve the nutrient utilization efficiency of chemical fertilizers to a greater limit and ensure grain yield, and has significant economic and ecological benefits. The fertilization method utilizes the organic resources grown in a paddy field to partially replace chemical fertilizers, without additional increase of labor and economic input, has high operability and low production cost in reality, and is convenient for large-scale popularization and application.