299results about How to "Reduce eutrophication" patented technology

The invention discloses a method for restoring vegetations in a water-level-fluctuating zone. The method is capable of effectively preventing and controlling water and soil loss, intercepting and absorbing harmful chemical substances in a water body, reducing eutrophication of the water body and rapidly afforesting the water-level-fluctuating zone, and has the functions of fixing soil and retaining banks. The method comprises the following steps: 1) preparing soil of a riverside slope surface in a fluctuating zone, finishing the fluctuating zone along the contour line to form a step structure, and respectively digging a cuttage ditch on various steps of the step structure; 2) using nutrient soil to cover various cuttage ditches, inserting a plurality of living branch wooden piles, and connecting the adjacent living branch wooden piles on the same step by using a rope to form a whole, wherein planting grooves are formed between two rows of living branch wooden piles on the adjacent steps; 3) sequentially filling a lower mucky soil layer, a water supply layer, an upper mucky soil layer and a nutrient soil layer into the planting grooves from bottom to top so as to form a planting layer; and 4) respectively planting submerged plants, emergent aquatic plants and water-resistant tree shrubs in various planting grooves along the step structure from bottom to top, so that a three-dimensional vegetation restoring space is formed.

The invention discloses a method for treating organic nitrogen in sewage. The method comprises the following steps of: treating sewage by using a sequencing batch biofilm reactor, decomposing macromolecular organic nitrogen into micromolecular organic nitrogen under the coexistence of anaerobic, anoxic and aerobic conditions, removing the micromolecular organic nitrogen by using the degradation of microbes, and simultaneously removing ammonia nitrogen and nitrate nitrogen through short-cut nitrification and denitrification and anaerobic ammonium oxidation; and treating by using a coagulation-microfiltration method, precipitating to remove bacteria, suspended solids (SS) and other nitrogen-containing substances by adding a coagulant, and removing refractory macromolecular organic nitrogen such as humic acid, fulvic acid and the like through filtration of a hollow fiber microfiltration membrane to reduce the total amount of the organic nitrogen in the sewage. The invention also discloses a device for implementing the treatment method.

The invention discloses an alga control method for a freshwater environment based on cultivation of barracudas and mullets, relating to a water treatment method. Aiming at solving the problem that algae can not be stably and thoroughly controlled in a eutrophic fresh water body, the method comprises the following steps: at least introducing one species of estuarine/marine fishes, such as barracudas and mullets which can only be propagated in sea water, and carrying out desalination processing before cultivation to enable the barracudas and the mullets to be adapted to a freshwater living environment, wherein the mesh size in the large water body ensures whether the cultivated fishes can escape; dividing or mixing according to different ages, carrying out culture in enclosure in girds by meshes, and simultaneously cultivating and propagating silver carps, bighead carps, other local fishes and local shellfish; and propagating local common aquatic plants. Thus, the fishes can be fed on the algae in a filter-feeding mode and simultaneously swallow detritus substances, thereby achieving the purpose of thoroughly purifying the water environment. By harvesting the cultivated and propagated aquatic organisms to remove nitrogen/phosphorus nutrients in water and humus in bed material from the water body, the method disclosed by the invention greatly improves the water quality of the cultivation water body.

The invention relates to a method for preparing a water quality modifying microecological preparation for reducing ammonia nitrogen and nitrite nitrogen, and belongs to the technical field of aquiculture technology and ecological environmental protection. The microecological is prepared by the following steps: mixing Bacillus foecalis alkaligenes CGMCC NO.1.1786 and arthrobacterium CGMCC NO.1282 into mixed bacteria; performing fermentation on the mixed bacteria for 24 to 36 hours in a culture medium in a fermenter at the fermentation temperature of between 28 and 32 DEG C; processing the obtained product into a liquid preparation through filling or continuous dilution or concentration after fermentation culture; and preparing the water quality modifying microecological preparation with the functions of reducing the ammonia nitrogen and the nitrite nitrogen in a water body. The preparation is convenient to use, is slightly influenced by environmental conditions, has small dosage, can obviously reduce the content of the ammonia nitrogen and the nitrite nitrogen in a pool water body after use, maintains the effect for 10 to 15 days, can effectively prevent diseases and paroxysmal death of aquaculture organisms and improve the yield and the quality of the aquaculture organisms when simultaneously improving the environmental quality of the pool water quality and the survival conditions of the aquaculture organisms.

The invention discloses a method for preparing urea ardealite by a solution crystallization method taking ardealite as raw material. The method comprises the following steps of: (1) preparing a saturated urea aqueous solution, and adding ardealite, soluble phosphate and urea into the saturated urea aqueous solution to form slurry; (2) in the conditions of normal pressure and normal temperature, uniformly mixing the slurry and performing crystallization reaction to obtain urea ardealite slurry; and (3) performing solid-liquid separation on the urea ardealite slurry, and then drying the solid phase to obtain the urea ardealite. According to the invention, on the conditions of normal pressure and normal temperature, ardealite, soluble phosphate and urea are used as raw materials, a solution crystallization method is adopted, the investment is small, and the operation is convenient; and the prepared urea ardealite has the characteristics of regular crystal form, uniform granularity, accurate adjustment of purity and stable quality.

The invention relates to a method and treatment agent for preventing and controlling blue-green algae. A cyanophage bacterium S agent is a culture solution with the solid content of 0.5-2 percent, which is prepared from spirulina powder, NaCl and purified water; a biological substrate modified agent of K agent is prepared by compounding saccharomycetes, bacillus subtilis and cyanophage bdellovibro; and an algal removing water purifying agent of L agent is prepared from 40wt% of sodium carbonate, 50wt% of fourth generation of polyamidoamine and 10 wt% of sodium bentonite. The invention overcomes the defects of two methods by using beneficial bacterium which scrambles nutrition with the blue-green algae and cyanophage capable of phagocytosing the blue-green algae. The invention is a system engineering for preventing and controlling blue-green algae, which organically combines a biological method and a chemical method and can prevent and control blue-green algae comprehensively with proper cost and favorable practicability and stability; and the blue-green algae is controlled by using a microbial method at early stage with obvious implementation effect , since a cell wall of the blue-green algae is thinner and cyanophage can phagocytose algae quickly; in addition, since a water body has high eutrophication degree in summer, comprehensive treatment can achieve good effect.

The invention discloses a method for treating mercury-containing wastewater by using modified blue-green algae. The method is characterized by comprising the following steps: (1) performing acidification modification treatment on blue-green algae, thus obtaining modified blue-green algae; (2) treating the wastewater by employing the modified blue-green algae; (3) detecting the supernatant fluid of the wastewater, and discharging the wastewater after qualification; and (4) recovering the blue-green algae, namely filtering the used modified blue-green algae, desorbing the blue-green algae in a desorbing agent for 1 hour, and filtering and refrigerating the modified blue-green algae. The modified blue-green algae raw materials used in the method come from eutrophic lakes and are easily obtained, mass propagation or dead algae in the lakes are reasonably utilized, the eutrophication phenomena can be reduced, and the treatment difficulty of the lake eutrophication is lightened; and moreover, the method for adsorbing and removing the mercury-containing industrial wastewater by utilizing the modified blue-green algae is simple in process and convenient to use.

The invention discloses a construction method of a lake water purification system. The method includes the steps of: (a) site surveying; (b) site construction; (c) precipitation zone configuration; (d) aeration zone configuration; (e) compounding zone configuration; (f) ecological planting zone configuration; (g) floating island unit establishing; and (h) regional beautification. The method provided by the invention has the advantages of simple construction, short construction period and cost saving, and after construction, the purification system has the functions of water storage, flood control, and water and air purification, can protect biodiversity, adjust microclimate and improve environmental quality, thus laying the foundation for water quality improvement of regional lake water.

The invention belongs to the field of agricultural non-point source pollution control, and particularly relates to a method for reducing phosphorus activity in organic waste compost products such as municipal sludge or livestock manure. The method comprises the following steps: 1) carbonizing and pyrolyzing agricultural wastes into charcoal at 400 DEG C, and crushing the charcoal by a 50mesh sieve; 2) mixing aerobic crop straws of organic wastes with the municipal sludge or livestock manure according to the ratio, adjusting the carbon-nitrogen ratio to be (20-30) to 1 and the moisture content to be 65-70%, and preparing a pile body; 3) adding the pile body to the charcoal, fully mixing the charcoal evenly, then carrying out aerobic composting for 45 days in a forced ventilation manner, and crushing the charcoal into the product. According to the method disclosed by the invention, the phosphorus activity of the compost product can be reduced, the phosphorus loss caused by compost application is reduced, and effective resourceful treatment on the agricultural wastes and the municipal sludge or livestock manure can be carried out, so that the agricultural non-point source pollution load is reduced, and the water environment is protected.

The invention discloses an organic and inorganic fertilizer with quick-acting and controlled-release functions and a preparation method thereof, and relates to the fields of a chemical composition and a preparation method thereof. The preparation method comprises the following steps: preparing master batch fertilizer in a disc or tumbling granulation manner, spraying xanthan gum and sulphur suspension liquid on the surface of the master batch fertilizer, and drying so as to form a layer of membrane on the surface of the master batch fertilizer; then preparing fertilizer slurry by using raw materials of the outer fertilizer, spraying the fertilizer slurry to the surface of the master batch fertilizer, spraying alkanamine acetate anti-blocking agent for the last time, carrying out air drying, cooling and bagging, thus obtaining the organic and inorganic fertilizer with the quick-acting and controlled-release functions. The organic and inorganic fertilizer with the quick-acting and controlled-release functions disclosed by the invention has long residual action of common organic and inorganic fertilizers and quick-acting property of common inorganic fertilizers; medium trace element nutrients and macroelements in the organic and inorganic fertilizer are synchronously released, so that the quick-acting and controlled-release integrated high-efficiency fertilization effect is achieved.

The invention discloses a breeding device of a self-propelled marine ranching and belongs to the field of fishery equipment. The breeding device of the self-propelled marine ranching comprises pile legs, a lifting rack, a gear motor, a platform body, a net cage, a propeller and a double-pull-plug mechanism, wherein the platform body is triangular; the double-pull-plug mechanism comprises a first hydraulic cylinder, a large circular ring, a small circular ring, electromagnets, jacks, a second hydraulic cylinder and a third hydraulic cylinder; through holes and rectangular holes on the pile legs, the electromagnets and the jacks are located on the same straight line. A ballast tank, a ballast pump and a hydraulic control system are mounted in the platform body. Compared with the prior art, the pile insertion type net cage can be pulled out of the platform or inserted in the platform quickly, so that the net cage can be taken away from the dangerous region quickly, and the eutrophication of the long-term culture zone is relieved; the net cage body can move up and down freely, so that the breeding device of the self-propelled marine ranching is capable of resisting against typhoon and has positive economic benefits.

The invention discloses a composite medicament for fixing nitrogen and phosphorous in riverbed sludge, and a preparation method and an application method thereof. The composite medicament disclosed herein comprises 90-99 wt% of powdered zeolite and 1-10 wt% of polymer ferric sulfate, and is prepared by mixing powdered zeolite and polymer ferric sulfate according to the proportion, and preparing into particles through mechanical molding. When using the composite medicament, the composite medicament is uniformly put into the water environment of rivers and lakes, and the dosage of the composite medicament is 0.5-2 kg/m<2>. The composite medicament has the advantages of low preparation cost, and good effect, can fast sink to the bottom when putting the composite medicament into water, uniformly disperses, effectively inhibits the release of endogenous nitrogen, phosphor, heavy metal, organic matters and the like, reduces the pollutant concentration of the overlying water, improves the water-bed ecological environment, and reduces eutrophication level and the occurrence of risk of water.

The invention discloses an aquaculture wastewater treatment method which comprises bio-filter filtration and water quality purification. The treatment method comprises the following steps: enabling aquaculture wastewater to pass through a bio-filter filled with a specific filter material; extracting flocculating agents from moringa oleifera seeds, and extracting microbial floc from microbial fermentation products; compounding with microbes, enzymes, fillers and the like to form a water purification agent, thereby purifying the aquaculture wastewater by using the purification agent. The aquaculture wastewater treatment method disclosed by the invention has the beneficial effects that the filter material in the bio-filter is easy to manufacture, raw materials are waste materials in industrial and agricultural production, complete-effect application of the materials is realized, the environment is protected, COD and NH4<+>-N can be effectively removed, and substantial organic matters and other impurities can be adsorbed; the composite water purification agent can achieve the effects of effectively degrading nitrogen, phosphorus, cellulose and other pollutants in a water body, effectively inhibiting algae growth, degrading the organic matters, reducing eutrophication of the water body and reducing the water turbidity and has an excellent flocculent settling effect on suspended solids in the water body.

The invention relates to floating bed plant method for repairing the aquiculture pond environment, which is characterized in that a floating bed plant system is constructed on the aquiculture pond water surface; the plates are planted without soil and the culture ecologic environment is repaired. The method comprises following steps: taking the fishing web made of nylon material as the carrier, tightening, fixing on a bamboo frame or a wood support by the lead wire; planting the plants into the meshes of the fishing net until filling the meshes; arranging a liner web on the bamboo frame or the wood support for protecting the plants; finally putting the floating bed with plants on the pond water surface. The invention solves the defects of the former floating bed carrier, ensures the gas exchange between the floating bed zone water surface and the atmosphere, enhances the atmosphere reaeration, increases the dissolved oxygen content in the floating bed zone water, improves the purification effect of the floating bed plants to the water and greatly boosts the quality and benefit of the pond culture.

The invention discloses a water quality treatment agent for aquaculture. The water quality treatment agent comprises the following components in parts by weight: 3-5 parts of a moringa oleifera seed flocculating agent, 2-4 parts of a microbial flocculant, 1-2 parts of a composite microbial preparation, 1.5-2 parts of an enzyme preparation, 4-6 parts of polyaluminum chloride salt, 5-8 parts of polyacrylamide, 4-5 parts of a potassium hydrogen persulfate complex, 0.2-0.4 part of a bacteria protective agent, 40-50 parts of a filler and 60-80 parts of distilled water. The water quality treatment agent has the beneficial effects that the treatment agent can achieve the effects of effectively degrading nitrogen, phosphorus, organic matters, cellulose, heavy metal ions and other pollutants in a water body, effectively inhibiting algae growth, reducing the water turbidity and reducing eutrophication of the water body and has an excellent flocculent settling effect on suspended solids in the water body, and is a high-efficiency and safe water quality treatment agent for aquaculture.

A dephosphorization and denitrification integrated material prepared based on a battering method mainly consists of the following materials according to mass ratio: 2 to 4 percent of fly ash, 0.3 to 0.7 percent of steel slag, 0.3 to 0.7 percent of zeolite powder, 1 to 3 percent of binder, and the balance of zeolite particles. Aiming at problems existing in the current sewage and wastewater treatment, the invention provides a composite material with dephosphorization and denitrification functions simultaneously, and a preparation method thereof; and compared with the existing sewage and wastewater treatment materials, the novel composite material not only can protect the environment and realize the reclamation of wastes, but also can obtain good social and economic benefits.

The invention provides environment-friendly all-permeable water-permeable concrete based on waste concrete and a preparation method thereof. The preparation method includes the following steps: (1) mixing and stirring 80-93% of a waste concrete regenerated aggregate, 5-15% of degradable waste plastic granules and 2-7% of dried spherical sludge granules from water plants, and after the raw materials are mixed uniformly, adding a part of blend water until the surface of the aggregate is wet; (2) successively adding a cementing material and a mixture liquid of the rest blend water and an additive, and stirring the raw materials until the surface of the mixture is bright; (3) successively paving the mixture according to the sequences of a porous cement stable layer, a water-permeable lower surface layer and a water-permeable upper surface layer, and pressing the paved mixture to form environment-friendly all-permeable colorful water-permeable concrete. The preparation method employs low-cost waste materials as raw materials and is simple in processes. The water-permeable concrete can adsorb nutrients in rainwater, is high in strength, has good water permeability, and is not liable to be blocked.