44results about How to "Control eutrophication" patented technology

The present invention belongs to the technical field of water ecological restoration, and specifically discloses a rapid method for constructing a river way water ecosystem, the method includes the following steps: 1, collecting of to-be-repaired river way water ecological information; 2, detailed analysis of pollution information, sewage interception reoxygenation and blackness and odor removal by microbial decomposition; 3, planting of emergent proper aquatic plants, submerged plants and the like according to water and hydrological information; 4, control of algae by aquatic animals; and 5, water ecosystem maintenance; wherein aquatic plants are usually harvested in November each year, and plant body residues are cleaned up in early spring. Through combination of an ECO-EGG plug-flow aerator and the constructed river way water ecosystem, physical, chemical and biological-ecological approaches are effectively combined for phased treatment, water quality is rapidly improved, water eutrophication is controlled, water self-purification capacity can be improved, the water ecological structure and function can be restored, water quality can be long term and effectively improved, meanwhile the effectiveness, long effectiveness, economical efficiency and ecological compatibility of polluted water treatment can be unified.

The invention discloses a method for preparing an environment-friendly natural fiber printing paste, comprising the following steps of: 1) selecting fine diatomaceous earth having a grain size less than or equal to 2 microns; 2) preparing raw printing paste, wherein the raw printing paste is composed of the following components in terms of weight: 6-13% organic printing paste material, 1-8% fine diatomaceous earth and 0.2-0.6% sodium hexametaphosphate, and rest being water; and 3) preparing the printing paste, wherein the printing paste is composed of the following components in terms of weight: 1-4% dye, 1-7% urea, 1-7% urea replacing agent, 1.5-2.5% sodium bicarbonate, 0.2-1% reserve salt S and 50% raw printing paste, and rest being water. The printing paste obtained through the method of the invention is capable of ensuring the printing quality and also capable of greatly reducing the content of organic matters in sewage discharged after printing, thereby reducing pollution.

The invention discloses a method for restoring micro-scale polluted reservoir water by using situ bio-contact oxidation. The method comprises the following steps: adopting fiber and sponge combined ball-type packings which are independently developed as carriers to perform screening, placing high effective strain which is obtained through screening in culture solution 'HS enrichment medium' to perform enrichment culture, then inoculating the strain which is through the enrichment culture in 'HSK culture medium' to perform expending cultivation and prepare biological microbial inoculum, placing packings in the microbial inoculum to perform biofilm formation and obtain biological immobilized packings; connecting the prepared biological immobilized packings with a string to fix the packings around the laboratory patented device water-lifting aerator of the invention and adopting water-lifting aeration-situ bio-contact oxidation to perform bioremediation to the micro-scale polluted reservoir water. The method of the invention can be used to effectively reduce the concentrations of COD, N, P and other pollutants in reservoir water and especially effectively lower the total nitrogen content of the micro-scale polluted reservoir water so as to fundamentally resolve the pollution problem of reservoir water, inhibit the growth of algae and control water eutrophication.

The invention discloses a repairing method of water body polluting bottom mud. The water body polluting bottom mud is polluting bottom mud in water bodies of city watercourses and landscape lakes severe in eutrophication. The repairing method includes the following steps of firstly, evenly putting a bottom mud activity covering material with granularity of 1-4 mm in a water body according to the type of main pollutant in the water body and the pollution loads, wherein the covering thickness is 2-6 cm; secondly, planting submerged plants in the water body when the water quality of the water body is remarkably improved and more than one third of the water body in the water depth is improved to be transparent; thirdly, recovering the submerged plants in winter. By means of the method, emission of nitrogen and phosphorus in bottom mud can be effectively reduced, eutrophication of the water body is controlled, the technology implementation process is simple, and cost is low.

The invention provides a method for reducing heavy metals in river-going overland runoff by aquatic plant matched growth, belonging to the technical field of heavy-metal-polluted river course restoration. According to the method, emerging plants calamus and reed, submerged plants Potamogeton pusillus, hydrilla, curly pondweed and watermilfoil, and floating plant common waaterrthacinth are grown from the riverbank to the river center. The growth density of the emerging plants is 10-20 plants/m<2>, and the growth proportion of the calamus and reed is 1:(1-3); the growth density of the submerged plants is 30-50 clumps/m<2>, and the growth proportion of the Potamogeton pusillus, hydrilla, curly pondweed and watermilfoil is 1:(1-2):(3-5):(1-2); and the growth density of the floating plant common waaterrthacinth is 10-20 plants/m<2>. The plant growth process is utilized to absorb and enrich heavy metal ions in water, thereby achieving the goal of restoring the river-going multi-heavy-metal combined pollution river course. The method has the advantages of small secondary pollution, simple restoration process, low cost and the like, and can maintain the balance of the ecological system in water. The method for treating the polluted river course has environmental value, ecological value and ornamental value.

The invention discloses a device for efficiently purifying eutrophic water. The device comprises a suspension frame, a suspension barrel, a dialysis space ring, an inner barrel, a water pump, a water draining pipe, a filler and an aerating device, wherein the suspension frame which is coincided with the axis of the suspension barrel is arranged on the upper part of the suspension barrel; the dialysis space ring is coaxially arranged in the suspension barrel so as to divide the suspension barrel into a purifying filtering barrel and an inner barrel, wherein a water feeding hole is formed in the suspension barrel wall of the purifying filtering barrel; the purifying filtering barrel is filled with the filler; the water pump is arranged in the inner barrel, and is connected with the outside through the water draining pipe; the aerating device is arranged at the top of the suspension frame and is connected with the purifying filtering barrel through an air pipe. According to the device, the filler adsorbing culturing microorganism is arranged in the purifying filtering barrel and the microorganism is utilized to degrade and purify the pollutants in water, so that the purposes of gradually purifying water and recovering excellent aquatic ecological environment of water are achieved, the anti-pollution impact capacity of water is enhanced, the water eutrophication is effectively controlled and the original ecological recovering and self-cleaning of water are realized.

The invention discloses a new adsorbing material for phosphorus in a water body and preparation and application methods thereof. The new adsorbing material is a product of zirconium-modified ca-montmorillonite, namely Zr-CaM1 and/or Zr-CaM2, and the preparation method of the material comprises the following steps: (1) mixing and dispersing: adding deionized water into ca-montmorillonite and zirconium oxide for mixing and dissolving, and oscillating for dispersing to obtain mixed liquid; (2) pH value adjusting: adjusting the pH value of the mixed liquid to be 9-11, and then performing oscillating reaction under constant temperature to obtain a solid-liquid mixture; (3) solid-liquid separation: performing centrifugal separation on the solid-liquid mixture to obtain precipitate, washing the precipitate with the deionized water repeatedly, and then drying to obtain the product of the zirconium-modified ca-montmorillonite, namely Zr-CaM1 and/or Zr-CaM2. According to the invention, a impregnation-exchange-coprecipitation method is adopted to prepare the novel zirconium-modified montmorillonite adsorbing material, and the adsorbing material has the advantages that the process is simple, the operation is easy, adsorption capacity on phosphorus of the adsorbing material is large, pH applicable range is wide, the operation cost is relatively low, the material is ecological and environmentally friendly, and the like.

The invention discloses an automatic switching device for water-lifting aeration equipment and bottom oxygenation mixed equipment. The switching device comprises a valve box body, an air inlet and two air outlets, wherein a switching plate which can rotate fixedly around a rotating shaft is arranged in the valve box body, a partition plate is arranged above the rotating shaft which is arranged onthe switching plate, the switching plate and the partition plate divide the internal space of the valve box body into a left air chamber, a right air chamber and an air distribution chamber, one air outlet is formed on the upper part of the left air chamber, the other air outlet is formed on the upper part of the right air chamber, and the air inlet is positioned on one side of the space of the air distribution chamber; and a baffle which is used for keeping the switching plate horizontal is positioned on the upper part of the switching plate at the bottom of the left air chamber and is fixedon an inner wall of the valve box body. The device is arranged at the tail end of an air transmission main pipe, the large-flow and small-flow air outlets are connected with the water-lifting aeration equipment and isothermal layer oxygenation mixed equipment respectively, and air is supplied to two kinds of in-situ water quality remediation equipment by using the same air transmission main pipe,so that the investment cost and operating cost of the air transmission main pipe are reduced.

A reaping device for submerged vegetation comprises a loading system and a reaping system, wherein the loading system comprises a reaping frame and a net nag, and the reaping frame has no bottom face; the net bag is fixed inside or outside the side face and the top face of the reaping frame; a cutting head is connected to a tail end of the side face of the reaping frame, and movable connecting parts are disposed on vertexes of the top face and the bottom part of the reaping frame; a reaping handle is an inverse L-shaped cylindrical body which is formed through mutual intersection and connection, and the tail end of the reaping handle is connected to the movable connecting parts; and the reaping handle controls opening and closing of the reaping frame through control of the movable connecting parts, so that the cutting head can be controlled to be closed and cut submerged plants. In a conventional submerged vegetation refloating method, only the dead submerged vegetation can be refloated, so that refloating is passive and not thorough. According to the invention, the submerged vegetation in a growth period is refloated, so that secondary pollution caused by natural death and rot of the submerged vegetation to water quality can be prevented, and thus water body eutrophication can be controlled.

The invention relates to a high-yielding and propagating Corbicula fluminea culture method. The method is characterized by comprising the following steps: firstly, selecting a propagating culture area, which is required to be far away from shipping thoroughfares and estuaries for water intake and drainage and cannot be a settled fish spawning site in a lake; secondly, carrying out purse seine in the selected propagating culture area, and controlling the area of a purse seine to 3hm<2> to 5hm<2>, wherein the purse seine should meet the requirements on preventing cultured fishes from escaping and preventing natural enemy fishes of Corbicula fluminea outside the purse seine from entering, and the height of the purse seine should be higher than the highest water level of the culture area over the years by at least 50cm; thirdly, selecting waveless weather, and carrying out fish eradication by adopting a ground cage and netting method; fourthly, carrying out young Corbicula fluminea stocking: selecting Corbicula fluminea, of which the shell length is 0.5cm to 1.2cm, the individual weight is 0.5g to 1g and the number per kilogram is 1,500 to 2,200, as offspring, and carrying out soaking for 10 to 20 minutes in a 2% to 4% common-salt aqueous solution before stocking for disinfecting; fifthly, stocking propagating fishes: selecting Hypophthalmichthys molitrix and Aristichthys nobilis as propagating culture fishes; and sixthly, strengthening daily management. The method disclosed by the invention is simple and is obvious in economic efficiency.

The invention discloses a water resource purification ecological floating bed. The water resource purification ecological floating bed comprises a floating bed body, an impeller, soilless plant cultivation devices, submerged plant tanks and side plates, wherein the impeller is mounted at the lower end of the floating bed body, the soilless plant cultivation devices are mounted on the two sides ofthe impeller, the submerged plant tanks are mounted at the lower ends of the soilless plant cultivation devices, and the side plates are mounted on the two sides of each submerged plant tank. The water resource purification ecological floating bed is scientific and reasonable in structure, safe and convenient to use, is provided with the impeller, mixes gas and water mixtures, promotes sufficientdissolving and absorption of oxygen in air, and improves the oxygen transfer efficiency and oxygenation capability; the soilless plant cultivation devices and the submerged plant tanks are arranged, and plants are planted evenly, so that pollutants such as nitrogen and phosphorous in the water body are removed conveniently, and eutrophication of the water body is controlled; the side plates are arranged, through buffer effects of flow buffer chambers in the side plates, the phenomenon is avoided that water flow outside tank bodies directly impact soil in the tank bodies, the flow velocity of the water flow is reduced conveniently, and soil loss in the tanks is reduced.

A water-lifting aeration water quality improving device enhanced through bubble cutting and bio-contact oxidation is provided. A lifting center cylinder is disposed in a cabin body of a bio-contact oxidation unit. The cabin body, the lifting center cylinder and a rising cylinder unit are coaxially arranged. A chamber between the cabin body and the lifting center cylinder is a filler filling chamber. The filler filling chamber is provided with a plurality of double-layer punched plates along the axial direction. The double-layer punched plates partition the filler filling chamber. A resistancereducing slot is disposed between two layers of each double-layer punched plate. A plurality of meshed ball shells are disposed in the filler filling chamber and contain a filler. The device combinesa bubble cutting aeration process and a bio-contact oxidation process, oxygen-rich water aerated by a water lifting aerator is brought into contact with a bio-contact oxidation gear in a process thatwater is lifted by the water lifting aerator, and concentrations of COD, N, P and other pollutants in water of a water source can be more effectively reduced, thus overcoming a water source pollutionproblem from the source.

The invention discloses a preparation method of an active covering plate for synchronously controlling nitrogen and phosphorus release of bottom mud. The preparation method comprises the following steps: (1) naturally air-drying sludge of a water purification plant, and calcining to obtain a sludge block; (2) the sludge blocks are subjected to mechanical crushing and mechanical vibration screening, and the aluminum-based phosphorus locking agent is prepared; (3) adding the aluminum-based phosphorus locking agent, cement, zeolite and water into a stirrer according to a ratio, uniformly mixing, and standing to obtain a base material; (4) the base material is added into a mold frame to be pressed; (5) after compression molding, standing and demolding to obtain a cover plate; and (6) standing the cover plate finished product under a natural open air condition for engineering application. The active covering plate prepared by the invention not only can synchronously control the release of nitrogen and phosphorus in bottom mud, but also has the advantages of washing resistance, good water permeability, high water retention and the like, and solves the problems of non-uniform covering, flood washing loss and the like of a granular covering material; the prepared active covering plate can be recycled, cyclic utilization of resources is promoted, meanwhile, the process is simple, operation is convenient, and the cost is low.

The invention discloses a salt-tolerant alkali-resistant aerobic denitrifying bacterium and application thereof, and relates to the technical field of environmental microorganisms and water treatment. The bacterial strain is called after Pseudomonas sp. MSD4. Through screening and separating, the salt-tolerant alkali-resistant aerobic denitrifying bacterium is obtained, the salt-tolerant range of the salt-tolerant alkali-resistant aerobic denitrifying bacterium is 0-10%, and the pH-resistant range of the salt-tolerant alkali-resistant aerobic denitrifying bacterium is 5-11. The bacterial strain has a wide application prospect in processes, including high-salinity waste water treatment, salt-alkali repairing and the like.