69results about How to "Reduce the concentration of pollutants" patented technology

The present invention provides a supported reactant for in situ remediation of soil and / or groundwater contaminated with a halogenated hydrocarbon consisting essentially of an adsorbent impregnated with zero valent iron, wherein the adsorbent is capable of adsorbing the halogenated hydrocarbon. In one embodiment, the adsorbent is activated carbon.

Methods for purifying one or more value materials are provided. The method can include contacting an aqueous mixture comprising a value material and a contaminant with a dispersant and a depressant to produce a treated mixture. A weight ratio of the dispersant to the depressant can be from about 1:1 to about 30:1. The method can also include recovering a purified product comprising the value material from the treated mixture. The purified product can have a reduced concentration of the contaminant relative to the aqueous slurry.

There is provided a process of reducing concentration of contaminants in a contaminated wastewater stream, such as contaminated wastewater output from a refinery, such as an oil-refinery; the process comprising: first, passing the contaminated wastewater stream into an electrocoagulation reactor for coagulating dispersed particles, filtering the wastewater stream after electrocoagulation for removing the coagulated dispersed particles, and providing a first stream of treated wastewater after the first filtration; second, passing the first stream of treated wastewater into a Spouted Bed Bio-Reactor (SBBR) containing a micro-organism or bacterium immobilized in polyvinyl alcohol (PVA) gel, filtering the first stream after treatment by the SBBR and providing a second stream of treated wastewater after the second filtration; and third, passing the second stream of treated wastewater into an adsorption column containing granular activated carbon (GAC) and providing a third stream of treated wastewater. There is also provided a system for doing the same.

The invention, in its various embodiments, relates to a medium for purifying fluids, particularly consumable fluids like air and water, by removing organic materials from the fluids by contacting the fluids with a combination of extremely small diameter transition metal oxide and an aluminosilicate having relatively large pores. In addition, contact of the fluids with the purification medium can also significantly reduce the level of microorganisms existing in the fluid, providing another purification benefit.

The invention discloses a high-concentration sewage treatment method. The method includes the steps: firstly, using an electrochemical oxidation method for pretreatment of sewage to obtain pretreated sewage; and secondly, adjusting the pH (potential of hydrogen) value of the pretreated sewage to range from 7.0 to 9.0, inoculating microalgae into the sewage, and subjecting the sewage to microalgaebiological treatment so as to purify the sewage, wherein the microalgae biological treatment operating conditions include: the temperature ranges from 25 DEG C to 30 DEG C, the light dark period is 12:12, the illumination intensity ranges from 40001ux to 60001ux, and the steps include aerating or mechanically stirring and continuously culturing for ten to twenty days. By the high-concentration sewage treatment method, sewage treatment cost is reduced, pollutant removal efficiency is improved. Further, the high-concentration sewage treatment method is wide in sewage treatment range, free of secondary pollution and flexible and controllable in operation mode, and environment-enhancing energy is realized.

Zero valent metal composite, manufacturing thereof, using thereof, and system including thereof, for (in-situ or ex-situ) catalytically treating contaminated water, such as sub-surface water, surface water, above-surface water, water vapor, or / and gaseous water. Composite includes powdered diatomite matrix incorporated with nanometer (1-1000 nm) sized particles of a zero valent (transition) metal (iron, cobalt, nickel, copper, zinc, palladium, platinum, or / and gold) and at least one electron transfer mediator (catalyst) from porphyrinogenic organometallic complexes (e.g., metalloporphyrins (chlorophylls, hemes, cytochromes) or metallocorrins (e.g., vitamin B12), and optionally, includes vermiculite. System includes composite and in-situ or / and ex-situ unit containing the composite, enabling exposure of contaminated water thereto. Applicable to in-situ sub-surface permeable reactive barriers (PRBs). Treatable water contaminants are organics (halogenated organic compounds), or / and inorganics (metal elements, metal element containing inorganic species, nonmetal elements, and nonmetal element containing inorganic species). Applicable to non-aqueous fluids (liquids, vapors, gases), for removing contaminants therefrom.

A nanostructured material having a coral reef morphology of nanoflake walls is described. The nanostructured material comprises a Fe(II) / Fe(III) layered double hydroxide intercalated with an azo dye, and a synthesis method is discussed. The nanostructured material may be used to remove a contaminant from a solution by adsorption. The nanostructured material may be cleaned and reused with high adsorption efficiency.

In some embodiments, a wastewater treatment system may reduce contaminants in water. A system may include one or more bioreactors which include a substrate that supports a biofilm. The bacteria used to form the biofilm may be selected to maximize the reduction of contaminants in water. Various components of the wastewater treatment system may be optimized to improve the efficiency and energy consumption of the wastewater system.

The invention relates to a method for treating waste water from production of metronidazole. The steps of the method are as follows: adding alkali in metronidazole process waste water to adjust pH value and after evaporation, sending the metronidazole process waste water to a waste water adjusting tank; allowing imidazole process waste water and nitration process waste water to enter the waste water adjusting tank respectively through a grating; after mixture as well as water-quality and water-quantity adjustment by the waste water adjusting tank, sending the imidazole process waste water and the nitration process waste water to an electrolyzer for electrochemical catalysis water treatment; adding lime milk in the effluent of the electrolyzer to adjust pH value, sequentially removing ammonia-nitrogen by a neutralization aeration tank, adding flocculant, separating by a coagulative precipitation tank, and allowing supernatant water to enter a facultative tank for anaerobic degradation; and conducting oxic degradation by a biomembrane aeration tank and precipitation by a secondary precipitation tank on the effluent of the facultative tank for standardized discharge. Adopting a electrochemical catalysis water treatment technology for pretreating waste water, the method effectively eliminates the biotoxicity of the waste water, lowers the pollutant concentration of the waste water and greatly improves the biodegradability of the waste water, thus laying foundation for standardized biochemical treatment. The method is simple in technology and convenient in operation.

This invention provides a process for reducing the concentration of chloramines, chlorine, ammonia, nitrates and nitrites in saline and fresh waters by adding to the water a treating material selected from alkali metal and alkaline earth metal formaldehydesulfoxylates in a dry or solution form.

Provided is a method of treating wastewater and recovering resources in acrylic fiber production, comprising the following steps: 1) filtering wastewater from water-washing and filtering unit of acrylic fiber plants by a filter to intercept and recover high-molecular-weight polymer contained therein, and then making the recovered polymer returned back to the acrylic fiber production and entered the finished product, optionally, reusing part of filtered wastewater as low salinity water in the water-washing and filtering unit; 2) removing non-interceptable high-molecular-weight polymer in the wastewater by subjecting the wastewater to coagulation and air floatation treatment; 3) introducing the effluent into biological treatment unit and adding polyvalent metal ions as an adsorption promoter to increase the removal of the non-biodegradable organics in the biological treatment unit; and 4) removing the organics remained in the effluent from the biological treatment unit by an advanced treatment.

Methods including a) volatilizing at least a portion of contaminated water contained in a contaminated water reservoir and thereby generating volatilized water, the contaminated water reservoir being fluidly coupled to a water generator reservoir; b) conveying the volatilized water to the water generator reservoir; c) cooling the volatilized water in the water generator reservoir and thereby generating purified water, substantially dehumidified gas, and heat; and d) conveying at least one of the substantially dehumidified gas and the heat to the contaminated water reservoir.

The invention provides a process for treating a loaded solvent stream having a time-varying contaminant concentration, the process comprising the steps of: (a) providing a plurality of hold-up tanks; (h) feeding the loaded solvent stream in dependence on its contaminant concentration to one or more of the hold-up tanks and; (c) allowing lowed solvent to flow from the plurality of hold-up tanks to obtain a smoothed loaded solvent stream having a reduced time-varying contaminant concentration. The invention further provides a treating unit comprising a circuit for circulating a solvent stream, which circuit includes a device for smoothing contaminant peak concentrations, said device comprising a plurality of hold-up tanks each hold-up tank having at least one inlet and an outlet equipped with an outlet valve, the device further comprising an inlet distributor allowing the control of solvent flow to one or more of the hold-up tanks.

The invention relates to a high-concentration sewage treatment system for an artificial wetland primarily, which comprises an anoxic hydrolysis pool, an active sludge pool, a secondary sedimentation tank and the artificial wetland, wherein the yielding water of the anoxic hydrolysis pool is connected into the active sludge pool, the yielding water of the active sludge pool is connected into the secondary sedimentation tank, and the yielding water of the secondary sedimentation tank is connected into the artificial wetland; the bottom of the anoxic hydrolysis pool is provided with a sludge-scrapping device, and the bottom of the active sludge pool is provided with an aerator; and the artificial wetland adopts a horizontal baffling structure, and the water outlet is provided with a water storage tank. The high-concentration sewage treatment system has a simple structure and reasonable process, the anoxic hydrolysis pool decomposes macromolecule organic matters into small molecule organic matters which are easy for aerobic biochemical treatment, and the active sludge pool and the secondary sedimentation tank further reduce the pollutants in the water and improve the oxygen content in the water so as to improve the biochemical process in the artificial wetland, thus the high-concentration sewage can be treated efficiently and good purification effect can be obtained. The high-concentration sewage treatment system is adapted to the treatment of high-concentration sewage.

The invention relates to an evaporator, a cold and heat combined supply system of the evaporator and a vacuum generator. The evaporator comprises a waste liquid barrel, the cold and heat combined supply system and the vacuum generator, wherein waste liquid in the waste liquid barrel enters the cold and heat combined supply system through a liquid inlet valve arranged in a pipeline; the waste liquid is evaporated and concentrated, concentrated liquid is discharged; and steam is condensed into water and pumped into the vacuum generator to be discharged; and a refrigerant is subjected to closed-loop circulation in the cold and heat combined supply system, subjected to compression temperature rise and subjected to heat exchange with the waste liquid, then subjected to discharging and expansiontemperature reduction, sequentially cools the steam and water in a circulation water tank and then is subjected to compression recirculation.

A reactor unit includes a bed of desiccant and a bed of media for treating pollutants. The media includes an adsorptive material and a reactive material. The adsorptive material is selected from at least one of activated carbon and zeolite. The reactive material is selected from at least one of potassium permanganate and sodium hydroxide. The adsorptive material is impregnated with reactive materials to enhance performance. A method of using the reactor unit includes delivering a moldable material into a mold. An effluent stream carrying pollutants produced by the moldable material flows through the reactor unit.

The invention discloses an automatic cruise type multi-coupling water quality purifier. The automatic cruise type multi-coupling water quality purifier comprises a frame body, a chemical core which is used for purifying a water body, a power supply device, a floating mechanism which is used for enabling the frame body to float on a water surface, and a water pumping mechanism which is used for pumping water in an external water body into the frame body; an open mouth is formed in the top of the frame body; the frame body floats on the water surface; a spiral purifying groove is formed in the frame body; the chemical core is positioned in the spiral purifying groove; the spiral purifying groove is spiral; an opening which is used for communicating the spiral purifying groove is formed in the outer wall of the frame body; the power supply device is electrically connected with the water pumping mechanism; the floating mechanism, the power supply device and the water pumping mechanism are all fixedly connected with the frame body; the water pumping mechanism is communicated with the centre of the spiral purifying groove. By adopting a spiral tangential water outlet structure, the automatic cruise type multi-coupling water quality purifier can rotate automatically on the water surface and can effectively rotate and avoid an obstacle or a river bank, so that cruise purification can be implemented in the whole water area range; the action range is wide; a dead angle is avoided; the automatic cruise type multi-coupling water quality purifier is suitable for water quality purification of various types of closed still water areas.

A porous activated asphaltene material is described with a method of making and a method of using for the adsorption of a contaminant from a solution. The porous activated asphaltene material may be made by functionalizing solid asphaltene with nitric acid, and then treating the product with a metal hydroxide. The resulting porous activated asphaltene material exhibits a high porosity, and may be cleaned and reused for adsorbing contaminants.

A method of using ZnO particles for the treatment of colon cancer and a method of using the particles for reducing the concentration of an organic contaminant in an aqueous solution is described. The ZnO particles are substantially spherical and may have nanopetals that provide a nanoflower morphology. The synthesis and characterization of the ZnO particles is also discussed.

Carbon fiber composite additives, media incorporating the carbon fiber composites, and related methods are provided herein. In some aspects, a composition includes at least one medium; and a carbon fiber composite incorporated with the at least one medium, the carbon fiber composite including one or more carbon fibers with an epoxy resin matrix applied thereto to produce a composition having improved characteristics and filtration performance.

The invention discloses a method for sewage treatment during refined cotton production and odor control in sewage treatment. The sewage treatment process comprises the steps of: A. biosorption and facultative hydrolysis; B. vapor floating; C. first deposition; D. second deposition; E. aerobic biological contact oxidation; F. third deposition; and G. variable water level isokinetic sand filtration. The odor control method comprises: reacting H2S gas in odor with NaOH in an alkaline waste liquid so as to generate Na2S and water, thus reaching deodorizing effect. The method of the invention has good sewage treatment effect and a COD (chemical oxygen demand) removal rate up to over 70%, and the finally treated water can completely reach national emission standards. With very ideal odor control effect, the method in the invention has no need for high tower, less equipment investment, and low odor control cost.

The invention relates to the technical field of waste gas purification, and particularly relates to a plastic granulation waste gas treatment system and a waste gas treatment process. The system includes two stages of spraying oil separating columns, a filtration tank, an oil fume purifier and a photocatalytic oxidation device which are connected in order. The two stages of spraying oil separatingcolumns include a first-stage spraying oil separating column and a second-stage spraying oil separating column. The system and the process are simple, can efficiently treat peculiar-smell gas in plastic granulation, perform staged treatment and purification for different components, and are high in purification efficiency, resistant to impact load, relatively low in investment and free of secondary pollution. Waste gas purification effects can meet environment protection requirements.

The invention discloses a PDS efficient fly ash stabilizing system which comprises a stirring device used for mixing raw materials; the stirring device is connected with a feeding system for feeding materials into the stirring device; the feeding system comprises a fly ash feeding system, a chelating agent feeding system, a water supply system and a retarder feeding system; the retarder feeding system is used for adding organic retarders into the stirring device, so as to guarantee that the discharged material of the stirring device is liquid slurry; the fly ash stabilizing system further comprises a filtering device which is connected with the stirring device and is used for dehydrating the liquid slurry formed by the raw materials after being stirred. The PDS efficient fly ash stabilizing system has the advantages: 1) the pollutant concentration of the product extract is reduced and the percent of pass of treated fly ash is improved; 2) the work environment is excellently improved; 3) the stirred product is liquid slurry and can be filtered; 4) the fly ash stabilizing system has a simple structure and using the conventional industrial equipment can meet the production requirements.

Cross-linked polymer resins and related salts, solvates, tautomers or stereoisomers are described herein. The cross-linked polymer resins may comprise monomer units of N,N-diallyl aminoalkylphosphonate, a hydrophobic pendant, a tetraallylpiperazinium cross-linker, and sulfur dioxide. A method for producing the cross-linked polymer resins is described. The cross-linked polymer resins may be used as adsorbent materials for the removal of heavy metal ions and contaminant dyes from aqueous solutions. Used cross-linked polymer resins may be removed from solution, cleaned, and reused while maintaining adsorption capacity.

The invention discloses a biochemical treatment system and method for pressurized gasification waste water of crushed coal, which belongs to the field of waste water treatment. The coagulation reaction tank, the coagulation sedimentation tank and the clean water tank are connected in sequence; there is a defoaming water pipe between the clean water tank and the anoxic-multi-stage aerobic system; the lift pump is equipped with a device for introducing crushed coal pressurized gasification wastewater pretreatment effluent Water inlet pipe; the clean water pool is provided with an outlet pipe for discharging treated water. In this system, the dual-cycle anaerobic filler reaction system hydrolyzes large molecular organic matter into small molecular organic matter under anaerobic conditions, improving the biodegradability of wastewater; The effluent COD, ammonia nitrogen and total nitrogen are greatly reduced. The system has the advantages of good processing effect, low operation cost and simple operation.