392 results about "Persistent organic pollutant" patented technology

Systems and method for selecting points-of-presence (POPs) to be used by client systems when accessing network resources from the Internet are disclosed. An access monitoring system capable of monitoring client system usage compiles usage profiles for each of a plurality of client systems as POPs are used to access the Internet. The POPs may charge for Internet access according a flat periodic fee, hourly rates, per-port rates, or other arrangements. Periodically, the access monitoring system evaluates the usage profiles to determine whether the client systems could have obtained access to the Internet for lower access costs if different POPs had been used. If so, the access monitoring system identifies the appropriate, cost-effective POPs and generates one or more scripts instructing the client systems to use the appropriate POPs. To subsequently access the Internet, the client systems execute the scripts and establish communication with the appropriate POPs. The process of monitoring usage and reevaluating which POPs should be used continues as desired. POP selection can also be conducted to balance load between various POPs based on the usage patterns described by the usage profiles.

The invention discloses an environmentally friendly biochar-based fertilizer and an application method thereof. The preparation of the biochar-based fertilizer comprises the following steps of: drying and crushing forestry and agricultural residues, then performing oxygen limited pyrolysis on the crushed materials for 1-5 hours at 300 to 700 DEG C, and sieving, thereby obtaining biochar; and after the biochar is fixed with persistent organic pollutant degrading bacteria, mixing the biochar with a fertilizer, stirring the two thoroughly, and adding a binder accounting for 1wt%-4wt% of the total weight, thus obtaining the environmentally friendly biochar-based fertilizer. For application, the prepared environmentally friendly biochar-based fertilizer is applied to soil by 100-1000 kg per hectare; the surface layer of soil, to which the biochar-based fertilizer is applied previously, is turned over by 0-20 cm, so that the biochar-based fertilizer is mixed with the soil thoroughly, and then the soil can be used for planting crops. The environmentally friendly biochar-based fertilizer provided by the invention overcomes the shortcoming that present biochar-based fertilizers contain organic pollutants such as polycyclic aromatic hydrocarbon, the influence of the fertilizer on soil and environment is alleviated, and the safety risk of agricultural products is reduced; moreover, the environmentally friendly biochar-based fertilizer has the advantages of simple and practicable preparation process, low cost and the like.

The invention relates to a method for repairing contaminated soil, and aims at providing a method and a device for repairing contaminated soil with persistent organic pollutants. The device comprises a separator, a material hopper, a material feeder and an indirect-heating thermal desorbing device which are connected with one another in sequence, wherein a soil emission device is connected to the bottom of the heating thermal desorbing device; a combustion system, a waste heat utilization device and an inert gas generator are respectively connected with the indirect-heating thermal desorbing device; the combustion system is connected with an outer barrel, and the inert gas generator is connected with an inner barrel; and a tail gas processing component comprises a cyclone dust extractor, a primary spray tower, a secondary regulating spray tower, a dehumidifier, a plasma reactor, an air filter, an induced draft fan and an exhaust barrel which are connected with one another in sequence. According to the method and the device for repairing contaminated soil with persistent organic pollutants disclosed by the invention, the amount of exhaust gas needing processing is less, water consumption is low, the persistent organic pollutants are thoroughly removed, the operation cost is reduced by 30%-60%, and the contaminated soil with persistent organic pollutants can be economically and effectively processed.

The invention provides a progressive repair method for soil polluted by chlorinated organic compounds. The repair method comprises the following steps: leaching the organic polluted soil by a water solution containing a bio-surfactant, and distributing most of persistent organic pollutants in the soil into a leaching solution; after finishing leaching, adding microbial degrading bacteria, and realizing the sustainable degradation of low-concentration organic compounds. The residual bio-surfactant cannot perform a negative function on the subsequent biodegradation of the organic pollutants, and can be used as a carbon source and be utilized by microorganisms. The bio-surfactant is used as a leaching agent, the organic pollutants are progressively degraded by a microorganism process, and the problems that the soil polluted by high-concentration chlorinated organic compounds is difficult to repair, traditional bio-surfactant produces residual toxicity, and the like are solved.

The invention discloses a method for preparing a graphene doped polyaniline-based carbon coated nickel zinc ferrite mesoporous material, which combines conductive polymer polyaniline, ferrite and graphene material. The method comprises steps of firstly preparing a nickel zinc ferrite magnetic matrix through a self-propagating combustion method, then preparing graphene doped polyaniline coated nickel zinc ferrite magnetic nanoparticle through an in site polymerization method by taking graphene as the dopant, finally, carbonizing at high temperature and reducing so as to obtain the carbon coated graphene or nickel zinc ferrite nanometer mesoporous material. The graphene doped polyaniline-based carbon coated nickel zinc ferrite mesoporous material prepared by the method can be used as both an electromagnetic wave absorbing material and an environment adsorbing material for adsorbing pollutants such as heave metals, POPs (persistent organic pollutants) and the like in the environment, and has very important value in fields such as military stealth materials, electromagnetic shielding materials and environment adsorbing materials.

The invention relates to a polluted soil treatment technology and aims to provide a system for drying persistent organic pollutants (POPs) polluted soil through flue gas waste heat. The system comprises a self-cleaning blade dryer, a heat-conducting oil pump and a heat exchanger, wherein an extraction opening is formed on the upper side of a shell of the self-cleaning blade dryer and is connectedwith a dust remover; a lower outlet of the dust remover is connected with a feeder; an upper outlet of the dust remover is connected with a spray tower, the spray tower is connected with a draught fan, and the draught fan is connected with an exhaust funnel; and the heat exchanger is arranged in a tail flue gas channel of another independent thermal desorption device, and tail gas exhausted by the thermal desorption device serves as a heat exchange medium. By the system, soil drying and tail gas treatment are integrated, the tail flue gas of the independent thermal desorption device serves asa heat source of heat-conducting oil of a drying machine, on-site construction and installation are easily performed, a low-grade heat source is fully utilized, the energy consumption in the soil drying process is reduced, and the energy is saved; and moreover, the whole system has a compact structure and high drying speed, occupies a small space and can be continuously operated.

The invention discloses a wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation. The device comprises a reaction container, wherein a magnetic stirrer is arranged at the bottom of the reaction container; a stirring magneton is arranged in the reaction container; a stainless steel microporous aeration head, an inert anode and a gas dispersing cathode are arranged in the reaction container; the inert anode and the gas dispersing cathode are vertically opposite to each other; the reaction container is also provided with a pipeline for introducing O3; and the inert anode and the gas dispersing cathode adopt a DC (direct current) power supply. The method comprises the following steps of: firstly inserting the inert anode and the gas dispersing cathode into the treated wastewater solution, and connecting with the DC power supply; then connecting pure oxygen with an ozone generator by a polytetrafluoroethylene tube; connecting the stainless steel microporous aeration head at a gas outlet of the ozone generator, and inserting into the bottom of the wastewater solution; and finally, switching on the DC power supply to treat the wastewater solution. Through the invention, H2O2 is continuously and efficiently generated and can quickly react with O3 to generate.OH so as to efficiently remove persistent organic pollutants in the water body.

The invention belongs to the field of an electrochemical reactor, and relates to a composite particle electrode for a bipolar three-dimensional electrode reactor and a preparation method of the electrode. The composite particle electrode comprises active carbon particles and porous ceramic ring grains, wherein the active carbon particles account for 60 to 70 percent by weight of the gross of a grain electrode, and the porous ceramic ring grains account for 30 to 40 percent by weight of the gross of the grain electrode; and the active carbon particles and the porous ceramic ring grains are respectively loaded with different metal active components. The preparation method comprises the following steps of: (1) preprocessing the particles and the grains, (2) soaking and adsorbing, (3) heat treatment, and (4) roasting activation. The composite particle electrode has the characteristics that the preparation method is simple, investment is less, the industrialization is easy to realize, and utilization rate of the effective space of an electrolytic tank is high. The composite particle electrode can be used for preprocessing high-concentration persistent organic pollutants, can improve the biodegradability of the sewage, and also can be used for the further treatment of the low-concentration sewage of a sewage treatment plant, and the application prospect is promising.

The invention discloses a catalyst using a TiO2-coated carbon nano tube composite material as a carrier and a preparation method thereof. The outer surface of a carbon nano tube is coated by TiO2 nanometer particles doped with an active component which is one or a plurality of of V2O5, MoO3, MnO2 and WoO3 and is 1-2 percent by weight of the catalyst. The catalyst is prepared by adopting a solvent hot method, has simple process, high yield and easy industrialized production and has excellent effects on denitrating smoke and removing dioxin-related persistent organic pollutants.

The invention discloses a processing method of coking steaming ammonia wastewater. The processing method of the coking steaming ammonia wastewater comprises pretreatment of coking steaming ammonia wastewater and biochemical treatment of the coking ammonia wastewater. The pretreatment of the coking steaming ammonia wastewater uses an adjusting pool, an internal electrolysis reactor, a Fenton oxidation pond and a coagulative precipitation tank. A sequencing batch membrane bioreactor technology is adopted by the biochemical treatment, and working procedures of inflow, unused-leaving, reacting and discharging are sequentially performed according to a time period. The processing method of the coking steaming ammonia wastewater can effectively remove persistent organic pollutants and ammonia nitrogen, strengthen effluent quality, and reduce operational and investing costs of equipment.

The invention discloses a preparation method of a hydrophobic silica fiber film and a use of the hydrophobic silica fiber film in removal of organic pollutants. The preparation method solves the problem that the existing silica fiber film adsorbs hydrophobic organic pollutants in water difficultly. The preparation method comprises the following steps of preparing silanes with hydrophobic groups and one or more solvents into a silane solution, and immersing a silica nanofiber film in the silane solution for modification so that a hydrophobic group-modified silica nanofiber film is obtained. The hydrophobic groups on surfaces of the silica nanofibers can bind with matrix silica by chemical bonds and thus the hydrophobic silica fiber film has strong adhesion, can be separated and recovered, can be prepared under mild conditions, and can be used as an adsorbent for adsorbing hydrophobic organic pollutants in a water source.

The invention especially relates to an electrodynamic force-reinforced leaching in-situ restoration apparatus for persistent organic contaminated soil, which belongs to the technical field of environmental protection. The apparatus provided by the invention comprises a power supply, an anode, a cathode, injection wells, extraction wells, a leaching agent store room, a solid-liquid separator, a leaching agent reusing and treating device, an anode chamber and a cathode chamber. According to the invention, the novel anode and the novel cathode are designed, so electrodialysis, electrophoresis and electromigration effects can be greatly improved; hydrolysis and migration of persistent organic pollutants can be effectively promoted; a certain number of the injection wells and the extraction wells are respectively inserted to the anode and the cathode, and pollutants wrapped by a leaching agent are migrated to the cathode through combination of an electrodynamic force and chemical leaching so as to achieve the effect of reinforced removal of the pollutants; and through combination of reinforcement of the electrodynamic force, a removal rate of the pollutants can reach 63 to 98%.

The invention discloses a method of activating persulphate by an OMS (Octahedral Molecular Sieve)-2 to degrade organic wastewater and relates to the field of catalytic systems and water treatment. The method comprises the following steps: adding a persulphate and OMS-2 into a wastewater solution; stirring for reacting, wherein persulphate generates sulfate radicals and hydroxyl radicals with strong oxidizing properties under the action of the OMS-2; and the radicals further oxidize persistent organic pollutants in the wastewater to finally degrade the organic wastewater. The OMS-2 added can persistently and efficiently catalyze and activate persulphate to degrade the organic wastewater and can be recycled and reused after reaction, so that the method is wide in application pH range, high in treatment efficiency at normal temperature and simple to operate and has a huge application prospect in the field of treatment of persistent organic wastewater.

The present invention relates to a method for treating polychlorobiphenyls (PCBs) in polluted soil. It is characterized by that it uses wirowave as heat source to heat the soil polluted by PCBs in container, utilizes the lots of aqueous vapour produced by action of microwave and water in soil to carry off the PCBs molecules from soil, namely microwave thermal desorption process, to implement separation of PCBs and soil, then the volatilized pollutant can be trapped, and treated by alkali-catalyzed decomposition process.

The invention relates to a passive sampling device for persistent organic pollutants (POPs) in air. The passive sampling device comprises a stainless barrel, wherein top covers are arranged on upper and lower ends of the stainless barrel; sampling fillers are arranged in the stainless barrel; low-density polyethylene films and stainless outer rings are arranged on the top covers; each low-density polyethylene film is fixed on each stainless outer ring; and the thickness of each low-density polyethylene film is 65 to 90mu m. The POPs in the air or waste air can freely pass through the film, particulate matters in the environment can be prevented from being contacted with the fillers, and gaseous POPs in the ambient air can be acquired, so that the subsequent extraction and purification of a sample are simplified; each low-density polyethylene film is fixed to each top cover, so that the passive sampling device has the advantages that the gas flow volume is larger, and the sampling speed is quicker compared with an X-ray diffraction (XRD) resin sampler; due to the sealed device, the influence of natural environment on the device is small; and the device is not required to be arranged in a special device compared with the conventional polyurethane foam (PUF) passive sampling device and the conventional semi-permeable membrane device (SPMD) sampler, so that the device can be simply and conveniently used.

The invention discloses a Pseudomonas aeruginosa strain TBPY, which is screened from tribromophenol(TBP)-polluted sludge and purified. The purified strain is domesticated by a pressure type domesticating method with gradually increased TBP concentration in an organic salt culture medium, and the domesticated strain can be used for the biological control of waste water containing persistent organic pollutants such as phenol, pyrocatechol, resorcinol, benzoic acid, p-hydroxybenzoic acid, vanillin, 4-chlorophenol, 2,4-dichlorophenol, trichlorophenol and tribromophenol and has high research and application values.

The invention discloses a method for degrading organic wastewater through excitation of peroxysulphate under the effect of ferrous molybdate. The method comprises the steps that peroxysulphate and ferrous molybdate are added into a wastewater solution, stirring is performed to enable the peroxysulphate and the ferrous molybdate to be subjected to a reaction, the peroxysulphate generates sulfate radicals and hydroxyl radicals with the strong oxidizing property under the effect of the ferrous molybdate, the sulfate radicals and the hydroxyl radicals further oxidize persistent organic pollutants in organic wastewater, and therefore the purpose of degrading the organic wastewater is achieved. The added ferrous molybdate continuously and efficiently catalyzes and activates the peroxysulphate under the normal temperature so as to degrade the organic wastewater and can be recycled after the reaction, the processing efficiency under the normal temperature is high, operation is easy, and the great application prospect is achieved in the field of persistent organic wastewater treatment.

The invention discloses preparation and an application of a composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants. The method adopts a sol-gel method for synthesis, and the g-C3N4-BiFeO3 composite photocatalyst is synthesized by one step with the sol-gel method. A xenon lamp is taken as a light source, BPA which is the persistent organic pollutant in the environment is taken as a photodegradation model, and a composite material and a BPA solution are mixed sufficiently for photocatalytic degradation and simulation of the BPA persistent organic pollutant in the water environment. The invention provides a method for efficiently removing the BPA in the water environment, more than 90% of the BPA in the water environment is removed within 2 hours with the method, the concentration is 10 mg/L, the performance is stable, the g-C3N4-BiFeO3 composite photocatalyst is synthesized successfully by one step for the first time, and the preparation and the application has great significance and development prospects in sewage treatment.

The invention discloses a method for treating persistent organic pollutant through base catalytic decomposition with the help of microwaves, which is to use base catalytic decomposition technology with the help of the microwaves to treat various wastes containing the persistent organic pollutant (POPs), utilize interaction of the microwaves and microwave absorbing materials as a catalyst to quickly raise the reaction temperature, and complete quick dechlorination of POP substances in the waste to be treated in the presence of base and a hydrogen donor together. The method can treat waste organochlorine pesticide (OCPs), polychlorinated biphenyl (PCBs) oil in transformers, soil and deposit severely polluted by the OCPs and the PCBs, waste incineration fly ash containing high-concentration bioxin (PCDD/Fs) and salt slurry in the chlorine alkali industry and the like, has short treatment time and high dechlorination efficiency, and can realize quick treatment of the various wastes containing the POPs.

The invention discloses a leaching restoration engineered apparatus for a persistent organic pollutant-contaminated site, belonging to the technical field of soil restoration. The apparatus mainly comprises a wet multistage vibrating screen, a muddy water storage tank, a hydraulic cyclone, a reagent adding tank, a leaching tank, a rinsing tank, an adsorption purification tank, a lamella settler, a chamber type filter press and a vehicle frame. According to the invention, contaminated soil is sieved by using the wet multistage vibrating screen to separate stones and grit; then a soil particle with a particle size of 2 mm obtained after sieving enters into the leaching tank, and the hydraulic cyclone is used to separate soil and leacheate; the soil successively passes through the rinsing tank, the lamella settler and the chamber type filter press and is then discharged after reaching the standard; and the leacheate containing pollutants is treated by using the adsorption purification tank and is then reused. The apparatus provided by the invention has the advantages of easy and convenient operation, strong controllability, a wide application scope, good removal effects, great treating capacity and the like; and the whole apparatus is mounted on the vehicle frame, so the apparatus is easy and convenient to move and is applicable to restoration works of contaminated sites.

The invention discloses a composite capable of efficiently degrading tetrabromobisphenol A, as well as a preparation method and application method of the composite, belongs to the field of degradation of persistent organic pollutants, and solves the problems that the energy consumption is high, the operation is complex and secondary pollution is easy to form existing in a conventional degradation method. According to the composite and the preparation method and application method thereof disclosed by the invention, magnesium-aluminum layered double hydroxide(LDH) is used as a carrier for loading FeB*, and through ion exchange, the loading of the FeB* is realized; when the FeB* is compared with free-state FeB*, the composite FeB*-LDH obtained through ion exchange effects not only promotes the removal of TBBPA, a debromination rate and a mineralization rate, but also realizes the separation of the FeB* from an aqueous solution, so that the recycling properties of the FeB* are increased.

The present invention relates to an activated coke for absorbing persistent organic pollutant like dioxin in flue gas and a preparation method thereof by using coal quality semi coke as a raw material. The preparation method is as follows: crushing the coal quality semi coke; impregnating the coal quality semi coke with an impregnating solution containing metal hydroxide or alkali metal carbonate activator and compound surfactant, and naturally drying; and finally activating the impregnated and dried semi coke at 800-950 DEG C to prepare the activated coke for absorbing dioxin in flue gas. The activated coke has characteristics of developed porous structure, low manufacturing cost and good adsorption effect, etc.