375 results about "Biological pollution" patented technology

An antifouling paint composition comprising an enzyme, such as endopeptidase, Subtilisin (EC 3.4.21.62) and Alcalase(R), and a rosin compound, wherein the enzyme is effective to reduce or prevent fouling by aquatic organisms of a surface coated with the composition. Also disclosed is a method for preventing fouling of a surface by aquatic organisms.

The invention discloses a whole-body type positive-pressure biological protective clothing with a monitoring system, which is composed of a protective clothing main body, a transparent hood, a sealed zipper, protective boots fixed on pants, protective gloves and a back air inlet joint, wherein the back air inlet joint is connected with an airflow distribution module; the air inlet end of the airflow distribution module is connected with a dynamic air supply system or an air inlet hose, and the air outlet end of the airflow distribution module is respectively connected with five hoses; an adjustable air intake valve is fixed on the protective clothing main body; two ends of the adjustable air intake valve are respectively connected with the air inlet hose and an air feed pipe provided with a compression air source; a one-way adjustable vent valve is fixed on each arm of the protective clothing body; a monitoring system is arranged in the protective clothing body and is composed of a pressure and temperature chest monitor fixed on the chest, a monitoring module and a state monitoring wristwatch, wherein the monitoring module is installed in the dynamic air supply system; and the state monitoring wristwatch is fixed on the forearm. The whole-body type positive-pressure biological protective clothing can provide protection with a high security coefficient for operating personnel working in laboratories, high-risk biological pollution environment of which the biosafety level is above three. Meanwhile, the biological protective clothing has higher comfort and can lower the physiological load and the psychological burden of the operating personnel.

A method and apparatus is provided for the purification of water, in particular to the removal of surfactants and optionally organic, inorganic and/or biological contaminants from water using adsorption filtration techniques.

The present invention relates to a tool for vitrification freezing and storing biological samples of ovum, embryo, etc. The present invention solves the problem that the biological sample is frozen promptly but is not exposed to liquid nitrogen directly, so as to prevent the potential biological pollution danger. The tool for vitrification freezing and storing biological sample comprises a straw and a protecting pipe which is mounted at the straw. The middle part of the straw is a fine thin-wall tube, the length of which is 20 to 30mm, and the diameter is 0.3 to 0.35mm. The two sides at the middle part of the protecting pipe are symmetrically provided with concave windows. The straw tool of the present invention is used for vitrification freezing and storing the ovum or the embryo and other cells, which can ensure that the biological sample is vitrified and frozen fast and also can ensure that the biological sample is not exposed to the liquid nitrogen directly to prevent the potential biological pollution danger.

The invention relates to a deep purification treatment system for high-concentration organic wastewater. The system comprises a grid, an aeration adjustment pool, a coagulation pool, a primary precipitation pool, an anaerobic pool, a hydrolysis acidification pool, an aerobic biofilter, a secondary precipitation pool, deep oxidation equipment, a sludge pool and a recycling water storage pool; through coagulation and primary precipitation, partial organic pollutants and suspended particulate matters in wastewater are removed; through anaerobic, anoxic and aerobic multistage mutual function, firstly, large-molecule organic matters are degraded to small-molecule organic matters; the small-molecule organic matters are decomposed to inorganic oxide and water through aerobic microorganism; the residual organic molecules in the water which are different to have biological decomposition under usual condition are subjected to further oxidation treatment through the deep oxidation equipment; the deep oxidation equipment preferentially selects a photocatalytic oxidation purifier with ozone input; through the oxidation function of ozone under catalysis of an photocatalyst, outlet water formed finally has high purification degree and no biological pollution and can be used as recycled water; and the deep purification treatment system is suitable for treating various wastewater with high concentration and organic pollution.

The invention relates to a polymeric composite membrane structure, in particular to a polymeric composite reverse osmosis membrane with an antibacterial function. The antibacterial composite reverse osmosis membrane is characterized in that: a polyamide polymeric desalination layer is compounded on a porous supporting membrane through interfacial polycondensation of polyamine and polyacyl chloride; and a polymeric material with the antibacterial function is compounded on the polymeric desalination layer by a surface coating technology. Sericin with the antibacterial function is coated on the surface of the conventional composite reverse osmosis membrane, so that hydrophilcity and antibacterial activity of the composite reverse osmosis membrane can be greatly improved and high biological pollution resistance is achieved. The antibacterial composite reverse osmosis membrane has the characteristics of simplicity in preparation, high desalination rate and high water flux. The reverse osmosis membrane has wide application.

The invention relates to a method and equipment for treating and recycling reverse osmosis concentrated water and complex wastewater with high salt content. The method comprises the following steps of: A. chemically treating raw water; B. separating chemically treated wastewater, wherein the chemically treated wastewater comprises 0.02-15 percent of solid in percentage by weight at an inlet of a film separating host machine; C. filtering the separated wastewater; and D. treating the filtered water by reverse osmosis. The equipment comprises a reaction device, a concentrator, a boosting pump, a separating host machine, a filter and a reverse osmosis host machine, wherein the reaction device comprises a chemical reactor and a medicament doser; and the separating host machine is a pipe type mould separating host machine. The invention has the outstanding advantages of improvement on the removal rate of heavy metal ions, hardness ions, silicon ions and COD (chemical oxygen demand) and the recovery rate of the wastewater, reduction of reverse osmosis film scaling, silicon scale pollution and biological pollution, inhibition of secondary pollution, less occupation of integral equipment, compact structure, simple operation and low running cost.

The invention discloses a functional polymer containing phosphorylcholine and PEG and a method for forming a biological pollution resistant interface. The polymer is a functional polymer that contains multiple function groups on a side chain and has a controllable proportion; a PEG flexible chain with larger steric hindrance and outer cell membrane phosphorylcholine hydrophilic group interact to achieve good anti-pollution effect; the polymer contains less than 10% of catechol group, and can be strongly combined with surfaces of various polydopamine-mediated base materials to form a stable hydrophilic monomolecular coating, so that the functional modification of material surfaces is implemented. The method for forming coatings is simple; the coatings can exist on the surface of any base material, so that the ability of resisting adhesion and pollution of multiple biological ingredients of the material surface is improved.

The invention discloses a novel biological pollution-resistant polyamide reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises carrying out graft modification on a polyamide reverse osmosis membrane through atom transfer radical polymerization (ATRP), carrying out sterilization particle loading to obtain a reverse osmosis composite membrane with bioattachment resistance and antibacterial properties. The reverse osmosis composite membrane polymerization process is carried out at the room temperature and has high controllability. The reverse osmosis composite membrane can be conveniently and fast prepared, has stable performances, effectively improves use efficiency and a use life and reduces a seawater desalination cost.

The invention discloses a detection kit and a detection method for 8 species of pathogenic bacteria in dairy products, which are used for food microbial contamination monitoring and detection. The kit comprises a detection solution A and a detection solution B, wherein the detection solution A and the detection solution B both contain 10 millimols of Tris.HCl, 50 millimols of KCl, 25 millimols of MgCl2, 2.5 millimols of dNTP and Taq DNA polymerase with a concentration of 5U/mu L and contain specific primer pairs of respective 4 species of target bacteria in an amount of 10 mu M each. The detection kit and the detection method of the invention can detect the 8 species of pathogenic bacteria in the diary products with high sensitivity, is short in detection time, simple and quick in operation, and can save a large amount of labor and financial resources and meet requirements for quick detection.

A portable apparatus for sanitizing and recovering mail and other materials is disclosed. The apparatus is employed after a known or suspected biological attack or contamination event, such as anthrax. Multiple X-ray sources penetrate mail and other materials, and destroy the biological agents. The apparatus is taken to the location of the biological problem, as opposed to shipping contaminated materials to a fixed facility for recovery. Many safety and practical advantages result from this approach to bio-terrorism or to biological contamination events. The design of this apparatus leads to a self-cleaning feature. Airflow control prevents escape of toxic biological materials into the environment.

The invention relates to a compound microbial preparation for treating urban river water pollution and a preparation method of the compound microbial preparation. The compound microbial preparation comprises the following microbial agents in parts by volume: a Lactobacillus acidophilus agent, a Candida tropicalis agent and a bacillus subtilis agent. The preparation method comprises the following step: uniformly mixing the agents, thereby obtaining the compound microbial preparation. According to the compound microbial preparation for treating urban river water pollution prepared by the preparation method disclosed by the invention, the number of active viable organisms is more than or equal to 4000 million CFU per gram, so that the compound microbial preparation is suitable for repairing and treating pollutions such as standard exceeding of content of COD and ammonia nitrogen in urban river water, river water contamination and smelliness, can rapidly repair an ecological environment of a water body, prevent secondary pollution of the water body, rapidly restore a self-purification function of the water body and clear up river bottom sludge and is a biological pollution control product with the advantages of high efficiency, rapidness, low cost and sustainable development.

The invention discloses a preparation method of a PVDF (polyvinylidene fluoride) film modified by silver phosphate modified nano negative ion powder. The preparation method comprises the steps of firstly, obtaining nano silver phosphate by adopting an ion exchange method, and modifying negative ion powder by nano silver phosphate to obtain negative ion powder with different silver carrying capacity; secondly, adding a proper amount of the silver-carrying negative ion powder into a PVDF casting film solution, and preparing the modified PVDF film containing the silver-carrying negative ion powder by adopting a phase inversion method. By virtue of peculiar nanometer size effect and surface energy of the silver-carrying negative ion powder, the PVDF film is endowed with effective anti-biological-pollution capability, the hydrophilicity of the PVDF film is improved, and the flux recovery rate of the PVDF film is increased; in addition, the preparation method of the modified PVDF film is simple and easy to adjust and control.

The invention discloses a bionic polymer, a method for preparing a durable double-bionic polymer coating and an application thereof, wherein the method comprises the following steps: the bionic polymer with side groups containing zwitterionic groups W, amino hydrochloride S and quaternary ammonium cation groups T and dopamine are dissolved in a solvent in sequence to prepare a polymer-dopamine alkalescent aqueous solution, then the different substrates are in the polymer-dopamine alkalescent aqueous solution, and the durable double-bionic polymer coating is obtained by leaching and drying. Theobtained coating has the advantages of high light transmittance, good hydrophilicity, strong universal base material, excellent coating stability, good biomolecule adhesion resistance and antibacterial performance, and simple preparation process; one-step dipping and coating method is convenient and efficient, green and mild property; the surface of the material has the advantages of long-term biological pollution resistance, bacterial infection resistance and high biocompatibility; the coating is suitable for coating the surfaces of medical equipment, diagnosis and treatment instruments, implants, drug delivery systems, contact lenses, corneal shaping lenses and the like with various shapes and materials and high light transmittance requirements.

The invention provides a method for preparing a nano silver organic frame ultrafiltration membrane and a method for purifying water using the nano silver organic frame ultrafiltration membrane, and relates to a preparation method of an ultrafiltration membrane and a method for purifying the water using the ultrafiltration membrane. The problems that an existing nano composite ultrafiltration membrane is poor in silver particle compatibility, serious in biological pollution in a filtration process and poor in removal effect on micro pollutants in water are solved. The method for preparing the nano silver organic frame ultrafiltration membrane includes the following steps: 1, preparing a polymer solution; 2, preparing a mixed solution containing a nano silver organic frame; 3, preparing a membrane-forming liquid; 4, conducting flow-casting and membrane scraping to obtain the nano silver organic frame ultrafiltration membrane. According to the prepared nano silver organic frame ultrafiltration membrane, the flux of a filtered pollutant aqueous solution is 100-150 L/m<2>.h, the removal rate of Escherichia coli is 95%-100%, and the removal rate of nitrogenous disinfection by-products is 92%-100%. The method for purifying the water using the nano silver organic frame ultrafiltration membrane can be obtained.

The invention relates to a macromolecular composite membrane for water treatment and in particular relates to a composite reverse osmosis membrane with an antibacterial function. The composite reverse osmosis membrane is characterized by compositing a polyamide macromolecular desalination layer on a porous support membrane through interfacial polycondensation between polyamine and poly-acyl chloride and coating an inorganic material layer with an antibacterial function on the macromolecular desalination layer through the technology of compositing by alternate impregnation in solutions. The composite reverse osmosis membrane has the advantages that the hydrophilicity and antibacterial property of the composite reverse osmosis membrane are greatly improved and the composite reverse osmosis membrane has good biological pollution resistance by depositing the inorganic material with the antibacterial function on the surface of the existing polyamide composite reverse osmosis membrane; and the composite reverse osmosis membrane with the antibacterial function also has the characteristics that the composite reverse osmosis membrane is easy to prepare, and the desalination rate and the water flux are not lower than the desalination rates and the water fluxes of the existing composite reverse osmosis membranes. The composite reverse osmosis membrane has a wide range of application.

A fresh vegetable foodstuff such as fruit, vegetables, grains or nuts is treated to reduce microbial contamination (UV-C irradiation, preferably in a CO2 atmosphere, preferably at -1 to +4° C.) and/or to induce protective phytoalexins (UV-A, UV-B and UV-C irradiation) and/or to destroy aflatoxins (UV irradiation, primarily UV-C). A modular system can be readily adapted to different foodstuffs. It can include treatment modules and support modules (e.g. for cleaning elements of the treatment modules, providing them with controlled environments, and controlling the input of foodstuffs so they are susceptible to treatment).

The invention relates to a phosphorus-free reverse osmosis membrane antisludging agent and a preparation method thereof, relating to water treatment. The phosphorus-free reverse osmosis membrane antisludging agent comprises the following components by weight percent: 50-90 percent of AL-one, 5-20 percent of sulphonate copolymer, 0.5-1.5 percent of pH regulator and the balance of de-ionized water. The preparation method comprises the steps of sequentially adding the de-ionized water, the pH regulator, the AL-one and the sulphonate copolymer into a container according to the weight percent, stirring for 1-1.5 h under room temperature and obtaining the product. The phosphorus-free reverse osmosis membrane antisludging agent can be used in a wider pH range of water supply, has favorable stability for calcium ion concentration, alkalinity and metal ions of iron, manganese, and the like, can effectively control dirties such as CaCO3, CaSO4, BaSO4, SrSO4, CaF2, SiO2, and the like, has no causticity compared with acid and safe operation, can be compatible with general flocculating agent, is not easy to decompose, can be stored for a long time and can eliminate biological pollution and bacteria exceeding standard of the membrane system and avoids pollution of calcium phosphate precipitation and pollution for environmental water source. The invention is suitable for the water treatment of a reverse osmosis system.

The invention relates to a method for modifying a polyamide composite thin film, relates to a method for improving pollution resistance of a forward osmosis polyamide composite film through post-treatment modification, and is used for solving the problems that because a conventional polyamide TFC film easily gets biological pollution, the film effluent flux is decreased, the film cleaning frequency is increased, the energy consumption is increased, the film life cycle is shortened, then the process treatment efficiency is reduced and the operation cost is increased. The method comprises the steps: one, coupling dopamine and an initiator; two, introducing the initiator to the surface of a film; three, grafting a zwitterionic polymer on the surface of the film; four, adsorbing silver ions; and five, producing nano silver in situ. The obtained modified TFC film has anti-adhesion and bacteriostasis effects, and can effectively control the biological pollution of the film. The atom transfer radical polymerization reaction is adopted for grafting of the zwitterionic polymer, large controllability is achieved, the graft length and density of the organic polymer can be controlled by adjusting and controlling parameters, and the properties of pollution resistance and mass transfer of the film are further optimized.

The invention provides a biological pollution resistant material and a preparation method thereof. The biological pollution resistant material comprises a base and a double-terminal-group hydrophilic polymer with two terminals grafted on the surface of the base, wherein the two terminal groups of the double-terminal-group hydrophilic polymer are independently selected from sulfydryl, amino, NHS-, carboxyl or sulfonyl. The two terminals of a two-terminal-group hydrophilic polymer molecular chain are simultaneously fixed to the surface of the base, the surface coverage rate of the hydrophilic substance molecular chain can be effectively increased, and meanwhile, the viscoelasticity of the polymer on the surface of the base can be effectively improved. According to the biological pollution resistant material, on one hand, mutually crossed annular conformation surfaces can resist insertion of protein, especially fibrous protein and further effectively inhibit adsorption of protein; on the other hand, the formed annular hydrophilic polymer layer can reduce water contact angles, inhibit adhesion of bacteria and prevent formation of a biological membrane. Accordingly, the biological pollution resistant material can realize low-protein adsorption and inhibit adhesion of bacteria.

The invention relates to a preparation method of a polymer separation membrane with antibacterial and anti-biological pollution properties for widely applying into water treatment, and belongs to the field of water treatment science and technique. A modifying method comprises the following steps of soaking the polymer separation membrane into a polyphenol compound solution, and forming a layer of polyphenol compound on the surface thereof; soaking the separation membrane into a silicon source solution, and growing a nanometer silicon dioxide carrier on the surface of the polymerizing isolation membrane in situ through the silicification action; crosslinking and coupling the nanometer silicon dioxide carrier on the surface of the membrane and a quaternary ammonium salt solution, so as to obtain the polymer separation membrane with antibacterial and anti-biological pollution properties. The modified polymer separation membrane has the advantages that the antibacterial ability and anti-pollution ability are obviously improved, the obvious inhibiting function on the propagation of bacteria and microorganisms is realized, and the service life of the membrane is prolonged; the chemical method is used for modifying, the reaction is uniform, the technology is simple, the operation is easy, the high-cost instrument is not needed, and the popularizing is easy; the modifying layer of the prepared quaternary ammonium salt modified polymer separation membrane is firm, the antibacterial ability and anti-pollution ability are good, and the potential wide application value is realized in the field of water treatment.

The invention relates to a preparation method of a high-flux biological pollution resistant reverse osmosis membrane. The method comprises the following steps of sequentially performing interface polymerization reaction on a reverse osmosis membrane substrate through a water phase solution containing ultrasonically dispersed and acidified carbon nanometer tubes and an organic phase solution; then,uniformly coating the upper surface with a layer of silver nitrate solution; performing still standing for 10 to 15 min; finally coating a layer of polydopamine solution; performing still standing for 5 to 10 min; performing drying to obtain a high-flux biological pollution resistant reverse osmosis membrane. The ultrasonic dispersed and acidified carbon nanometer tubes are added into the water phase solution, so that the combination and dispersion capability of the carbon nanometer tubes and the water phase can be enhanced; a unique water passage is built on the reverse osmosis membrane; thecoated nanometer silver ions are powerfully combined onto the surface of the reverse osmosis membrane through the quinoid structure of the polydopamine; the biological pollution resistant capabilityof the reverse osmosis membrane in the use process is enhanced. The water contact angle of the prepared reverse osmosis membrane is reduced from 70 degrees to 40 to 25 degrees; the water flux is improved to 50 to 70 L/m<2>.h; the process is simple and proper; the operation is easy; the method can be widely applied to industrialized waste water treatment.

The invention discloses a fishing net for reducing marine biological pollution. The fishing net comprises the following raw materials in parts by weight: 94-100 parts of ultra-high molecular weight polyethylene (UHMWPE), 2-4 parts of polyethylene terephthalate (PET), 1-2 parts of jojoba oil, 1-2 parts of methylisothiazolinone, 0.3-0.4 part of triallyl cyanurate, and 3-5 parts of a modified plasticizer; the fishing net provided by the invention can greatly reduce pollution to the fishing net caused by marine organism, and growth of bacteria and corrosion, and is simple and convenient to clean.