42results about "Water treatment compounds" patented technology

The invention discloses a treatment method of landfill leachate. The treatment method comprises the following steps: adding a flocculating agent and a coagulant aid into the landfill leachate for full reaction, and separating to obtain first treatment fluid; adding an oxidant for full reaction, and obtaining second treatment fluid; adding a water softening agent for full reaction, and obtaining third treatment fluid; performing triple effect evaporation on the third treatment fluid to obtain condensed fluid; performing A2/O technological treatment on the condensed fluid, and filtering to obtain fifth treatment fluid; performing sand filtration, carbon filtration, ultrafiltration and RO (Reverse Osmosis) membrane treatment on the fifth treatment fluid in sequence to obtain sixth treatment fluid. According to the treatment method of the landfill leachate, all the indexes of the sixth treatment fluid obtained by treating the leachate of a waste landfill meet a discharging standard, so that the landfill leachate can be discharged with the standard level; the landfill leachate can be harmless and recycled to the maximum extent.

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

According to the invention, the porous carbon-coated nano zero-valent iron composite catalyst is prepared by taking a metal skeleton as a precursor, and has excellent catalytic performance in an electro-Fenton process. The synthesis method has the advantages of simplicity and convenience in operation, low equipment requirement, good product performance reproducibility and the like. Due to the synergistic effect of iron and carbon, electron transfer is accelerated, and the catalytic efficiency is remarkably improved. The iron-carbon material has strong magnetism, can be quickly separated in a magnetic field, and is convenient to recover.

The invention discloses a step-by-step heating system for high-viscosity slurry. The system comprises a preheating hydrolysis tank, a material pump, a high-temperature and high-pressure heat exchanger, a reaction processing unit, a heat source, a heat taking and utilizing unit and a subsequent processing unit. The system has the advantages that aiming at the high-viscosity slurry, through rapid primary heating and thermal hydrolysis viscosity reduction treatment of strong mechanical disturbance in the preheating hydrolysis tank and a step-by-step heating strategy for secondary preheating in the high-temperature and high-pressure heat exchanger, the high-efficiency heat exchange and temperature rise and low-resistance conveying of sludge to be preheated to the supercritical temperature areeffectively realized, and the high-efficiency and low-cost implementation of a supercritical water harmless treatment and resource utilization process for oil sludge, oil sand, high-viscosity organicmatter and other various slurry including the sludge is effectively promoted.

The invention provides a magnetic composite photocatalyst Ppy@CdS/ZnFe2O4 and a preparation method and application thereof. The preparation method comprises the following steps of ZnFe2O4 preparation, CdS/ZnFe2O4 preparation and Ppy@CdS/ZnFe2O4 preparation. The composite photocatalyst Ppy@CdS/ZnFe2O4 established through a molecular imprinting technology can form a Z-type heterojunction due to printing layer selectivity and CdS and ZnFe2O4 matching, so that a composite photocatalytic material prepared by the magnetic composite photocatalyst has certain selectivity and catalytic activity.

The invention discloses a resin-based nano-lanthanum material and a preparation method and application thereof, and belongs to the field of environmentally functional materials. The preparation methodincludes the following steps: 1) dissolving lanthanum chloride heptahydrate and concentrated hydrochloric acid in alcohol, performing mixing, adding a resin polymer, and performing stirring at room temperature; 2) filtering the resin after completion of stirring, and performing drying; 3) adding the resin to a precipitant solution, and performing stirring at room temperature so as to filter out the resin; and 4) washing the product by using water until neutrality, adding a NaCl solution, performing stirring, filtering out the resin, and performing drying so as to obtain the resin-based nano-lanthanum material. Lanthanum is mixed with hydrochloric acid so as to make lanthanum and chloride ions form complex anions, lanthanum in the form of complex anions in alcohol is uniformly adsorbed into anion exchange resin pore channels, then the nano-lanthanum compound is further generated in situ, and the prepared nano lanthanum particles have more uniform distribution, and have a high phosphorus adsorption rate.

A droplet-impingement, flow-assisted electro-Fenton (DFEF) catalyst, system, and method can degrade to trace level organic materials, such as β-blockers in water. A silica/carbon-x % iron composite (RHS/C-x % Fe) can be made, e.g., from rice husks and iron ions into heterogeneous catalysts of varied iron content. The DFEF approach can improve oxygen saturation, mass transfer of β-blockers at the cathode, and continuous electrogeneration of hydroxyl radicals (.OH) in solution and at boron-doped anode surfaces. A central composite design (CCD) can reduce costs and increase efficiency. Beta-blockers can be completely degraded within 15 minutes, following pseudo first-order kinetics with rate constants of 0.19 to 2.72×10⁻² (acebutolol) and 0.16 to 2.54×10⁻² (propranolol) at increasing catalyst concentration. Beta-blocker degradation can be mostly by .OH_bulk rather than .OH_adsorbed for anodic oxidation (AO) at BDD electrode. The degradation efficiency of β-blockers can be: DFEF>FEF>BEF>AO.

The invention discloses an efficient liquid sodium acetate carbon source for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source is prepared from sodium acetate, glacial acetic acid, sodium carbonate, ethyl alcohol, glucose and deionized water. The efficient liquid sodium acetate carbon source is prepared through the following steps: uniformly mixing sodiumacetate and glacial acetic acid, adding a part of deionized water, stirring to obtain a solution 1; taking sodium carbonate, adding a part of deionized water, and stirring to obtain a solution 2; taking glucose, adding a part of deionized water, and stirring to obtain a solution 3; and mixing the solution 1, the solution 2 and the solution 3, sequentially adding ethyl alcohol and the rest of deionized water, and uniformly stirring to obtain the efficient carbon source (liquid sodium acetate) for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source has thebeneficial effects that sodium acetate is harmless to a human body, is low in cost, is easily absorbed and used by microorganisms, and is an ideal external carbon source; glacial acetic acid can externally increase a carbon source, and the pH value is maintained in the sewage treatment process; and sodium carbonate can provide an inorganic carbon source for a part of microorganisms.

An apparatus for the photocatalyitc oxidation of common industrial effluent contaminants in aqueous solution includes a reactor and a thin film photocatalyst fixed to a support material like Cuddapah stone. The support material is preferably an inert material. The TiO2 preformed does not contain any adsorbent for making the thin film photocatalyst, The catalytic runs were carried out over TiO2 thin film fixed bed reactor. The study is extended to the immobilization of preformed TiO2 with a binder for making thin film using a simple spray technique on inert Cuddapah stone. This method of immobilization require no thermal treatment of the catalyst at high temperatures. The method is applicable for the photocatalytic treatment of industrial effluents at a higher scale. Also it is a method for preparing a photocatalyst adopted for the oxidation of industrial common effluent by simple spray technique. Also it is a method and apparatus for destroying industrial common effluent contaminants in aqueous solution

The invention discloses a graphene hybridized photocatalyst hydrogel, belonging to the field of nanometer materials. The graphene hybridized photocatalyst hydrogel is used for treatment of water pollution and prepared by using graphite oxide and a photocatalyst as raw materials through a reduction reaction and ultrasonic treatment. The graphene hybridized photocatalyst hydrogel provided by the invention can promote the dispersion of graphene oxide in water, avoids further aggregation of a nanoscale photocatalyst from generation in the process of hydrogel formation, can significantly improve the specific surface area and adsorption capacity, has more obvious three-dimensional cross-linked mesoporous microstructure, can realize the synergistic effect of adsorption enrichment and photocatalytic degradation, significantly reinforces the in-situ catalytic degradation ability of adsorbed and enriched pollutants, and can greatly improve the mineralization and removal efficiency of pollutants.

The invention belongs to the field of domestic sewage treatment, and particularly relates to an ozone-assisted photocatalytic sterilization device, which comprises an ozone generation system, a first control valve, a gas flow meter, a filter, a liquid flow meter, a second control valve, a jet flow mixing device and a photocatalytic reactor, wherein the ozone generation system is connected with the gas flow meter through the first control valve; the filter is connected with the liquid flow meter through the second control valve; the jet flow mixing device is provided with a gas inlet, a liquid inlet and an outlet; the gas flow meter is connected with the gas inlet of the jet flow mixing device; the liquid flow meter is connected with the liquid inlet of the jet flow mixing device; the outlet of the jet flow mixing device is connected with the photocatalytic reactor. The device has the beneficial effects that a process flow is simple, the device is easy to operate, and has good sterilization and disinfection effects, and the treatment cost is effectively lowered.

The invention discloses a polyaniline/perylene bisimide organic heterojunction photocatalyst and a preparation method and application thereof, which comprises the following steps: simultaneously cooling an aniline and protonic acid mixed solution A and an ammonium persulfate aqueous solution B to below 4 DEG C, quickly mixing to react, and obtaining polyaniline aerogel through the steps of soaking, washing and drying; in an argon atmosphere, putting perylene-3, 4, 9, 10-tetracarboxylic dianhydride, [beta]-alanine and imidazole into a three-necked flask, performing heating at 100-120 DEG C, performing starting to stir until a solid is dissolved, and continuing to react for 4 hours at the temperature; cooling to room temperature, dispersing the mixed solution into an ethanol and hydrochloricacid mixed solution, and continuously stirring for 20-30 hours; and performing filtering, washing and drying to obtain the perylene bisimide photocatalyst. The polyaniline/perylene bisimide organic heterojunction photocatalysts with different mass ratios are prepared by adopting an in-situ growth method. The polyaniline/perylene bisimide organic heterojunction photocatalyst obtained by the invention has a good application prospect in wastewater treatment and hydrogen peroxide preparation.

In a water treatment method, raw water supplied from a water supply reservoir for reserving the raw water is biologically treated by a biological treatment means before being supplied to a primary pure water apparatus. Thereafter, urea or a urea derivative and/or an ammoniacal nitrogen source (NH₃—N) are added before the biological treatment means. In such a treatment flow, it is preferred that a reduction treatment means is provided after the biological treatment means and before the primary pure water apparatus. According to the water treatment method, the TOC, in particular urea, in the raw water can highly be decomposed.

A preparing method of a Ag3PO4@Ag/carbon sphere ternary heterojunction composite material capable of selectively removing cationic dye is disclosed. The method includes subjecting a glucose solution having a mole concentration of 0.5 mol/L to a hydrothermal reaction in a hydrothermal reaction kettle at 180 DEG C for 5-8 h to obtain carbon spheres having an average diameter of 0.3-0.7 [mu]m; addingdropwise ammonia water having a concentration of 10-25 wt% into a AgNO3 solution having a concentration of 0.05-0.2 mol/L to prepare a transparent Tollens' reagent; adding the carbon spheres into theTollens' reagent with the mass ratio of the carbon spheres to the AgNO3 being 0.01-0.1:1 and stirring the mixture for 2-10 h; adding dropwise a Na2HPO4 solution into the mixture with the mole ratio of Ag<+> to PO<4><3-> being 3:1-10; reacting the mixture for 1-3 h; then performing centrifugation, filtration and washing; and drying a product in a vacuum drying oven at 50 DEG C to obtain the composite material. The composite material can rapidly and efficiently remove cationic dye and the synthesized composite material has good stability.

The invention discloses a Fenton reaction enhancer and application thereof. The Fenton reaction enhancer is prepared by a preparation method comprising the following steps: carrying out photocatalytic treatment on a hydrogen peroxide solution to obtain the Fenton reaction enhancer. The Fenton reaction enhancer provided by the invention is simple in preparation method, single in component, low in cost and free of secondary pollution, has very strong oxidability, and can improve the utilization rate and the reaction rate of hydrogen peroxide. When the Fenton reaction enhancer is used for treating wastewater, the use amount of hydrogen peroxide and ferrous iron can be reduced, the sludge amount is greatly reduced, and the application range is wide. The Fenton reaction enhancer can be used for pretreatment of high-concentration organic wastewater to improve the biodegradability of sewage, can also be used for advanced treatment of tail water, and can reduce COD and realize up-to-standard discharge.

The present disclosure relates to an apparatus for reducing harmful substance in sewage and waste water for ecotoxicity removal, including a main decomposition unit in which sewage and waste water is treated and an activated electron aeration device for decomposing the sewage and waste water.

The invention relates to the technical field of sewage treatment, in particular to a method for automatically adjusting Fenton process parameters based on linkage of PH and ORP, and the method comprises the following steps: step 1, performing pretreatment, and testing the COD value of wastewater; step 2, pumping the wastewater in the water quality regulating tank into a dosing mixing tank, adding an acid regulating agent, controlling the pH value to be 4.0-4.5, adding a ferrous reagent, and uniformly mixing; step 3, transferring to a catalytic reaction tank, adding hydrogen peroxide, uniformly mixing, controlling the pH value to be 4.0-4.5 and the ORP value to be greater than or equal to 450mV, and carrying out Fenton oxidation reaction for 6-8 hours; step 4, detecting the chromaticity of the sewage treated by the Fenton oxidation reaction, and adding an aluminum sulfate solution for regulation and control; step 5, transferring to a neutralization tank, adding a calcium hydroxide solution, uniformly mixing, and controlling the pH value to be 6.0-6.5; and 6, transferring to a sedimentation tank, adding PAM, uniformly mixing, standing and precipitating, and testing the COD value of the purified water. According to the method, COD in the water body can be effectively removed, so that the sewage treatment efficiency and treatment quality are ensured.

The invention discloses a method and a device for synchronously and efficiently removing nitrogen and phosphorus from low C/N domestic sewage by using an internal carbon source through a single-stage sequencing batch reactor, and belongs to the field of domestic sewage treatment. After domestic sewage enters the integrated short-cut nitrification endogenous short-cut denitrification phosphorus removal coupled anaerobic ammonia oxidation SBR reactor, an organic carbon source in the domestic sewage is converted into an internal carbon source in bacteria in a front anaerobic section, and the phosphorus release process is also completed; in the low-oxygen aeration stage, the phosphorus-accumulating bacteria absorb a part of phosphate in the sewage, and the ammonia-oxidizing bacteria oxidize ammonia nitrogen in a part of raw water into nitrite; and finally, in the anoxic section, part of nitrite and part of residual ammonia nitrogen generated in the aerobic section are converted into nitrogen by anaerobic ammonia oxidizing bacteria, the generated nitrate nitrogen is reduced into nitrite by denitrifying phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria, and the denitrifying phosphorus-accumulating bacteria further absorb phosphate. According to the method, the carbon source in the raw water is fully utilized to realize synchronous nitrogen and phosphorus removal of the low C/N domestic sewage, the ineffective loss of the carbon source is reduced, the energy consumption is reduced, and the sludge yield is relatively low.

The object of the present invention is a method and an apparatus for underwater decomposition of organic content of aqueous waste solutions, involving the measurement and, if necessary, adjustment of the pH and electric conductivity of the solution, maintaining optimum pH and/or electric conductivity during the process, and further involving the partial or total decomposition of organic materials contained by the solution. The apparatus comprises a feed tank, at least one decomposition loop, and a storage tank. The method according to the invention is characterized by submerging electrodes in the solution, producing and maintaining an electric arc between the electrodes and the electrically conductive the solution, where the arc is produced by an electric current of at least 0.5 A/cm² current density at a voltage of at least 70 V and by a symmetrical alternating current having preferably a frequency of at least 10 Hz; and by decomposing the organic content of the solution into water, carbon dioxide, and nitrogen.

The invention provides a TiO2 single-crystal hollow square nanocone material and a preparation method and application thereof. The preparation method includes: mixing 1, 6-hexamethylene diamine and cyclohexane, and then adding Ti(OC4H9)4; adding deionized water, and stirring and mixing to obtain suspension; sealing the obtained suspension, performing heating reaction, cooling, centrifuging, precipitating and washing, and drying to obtain the TiO2 single-crystal hollow square nanocone material. Compared with the prior art, the preparation method has the advantages that the anatase TiO2 single-crystal hollow square nanocone material prepared by the method has a large amount of exposed {101} faces and large specific surface area; the TiO2 single-crystal hollow square nanocone material has excellent photocatalytic activity on organic dye rhodamine B, methyl orange and colorless organic small-molecular phenol and is high in degrading efficiency, good in stability, environmentally friendly, simple in preparation process and low in cost.

The invention belongs to the technical field of photocatalytic oxidation, and discloses a method for regulating and controlling the activity of a catalyst by utilizing a continuous flow photocatalytic reaction device and application of the method. The method comprises the following steps: putting a diluent of a target pollutant into a liquid storage tank, and tightly connecting the liquid storage tank with a photocatalytic reactor through a silicone tube; according to the method, a single-channel peristaltic pump is used for controlling the water inlet flow rate to be 5-30 mL/min and the water outlet flow rate to be 1-15 mL/min respectively, it is guaranteed that the average water flow speed is 3-20 mL/min, the device operates in a continuous flow state, and a catalyst is continuously excited by ultraviolet light till target pollutants are completely oxidized. According to the method, the contact time of a target object and a catalyst is changed by adjusting the flow speed of a to-be-treated fluid at a water inlet and a water outlet under the condition that the target object is efficiently treated, so that the activity and the service life of the catalyst are regulated. The method can be used for research of related mechanisms such as catalyst deactivation and the like, and the fields of medical wastewater treatment, sewage treatment secondary effluent or deep purification of urban drinking water and the like.

The invention belongs to the technical field of catalysts, and discloses a photocatalyst transition metal halide molten salt preparation method and application, a low-valence compound stable to air and water is used as a Ti source, transition metal halide is used as molten salt, the Ti source and the molten salt are mixed and ground according to a molar ratio, and a photocatalyst transition metal halide molten salt is obtained; and heating the transition metal halide in an air atmosphere until the temperature is not lower than the melting point of the molten salt, enabling the transition metal halide to be in a molten state, preserving heat, washing with water, and separating to obtain the reduction-state TiO2-x photocatalyst which is rich in Ti < 3 + > and Ov and has excellent visible light response capability. The obtained product has excellent visible light response performance, and the defects that multiple steps are needed for traditional defect-state titanium dioxide preparation, and flammable and explosive reducing gas or other dangerous reducing agents or oxidizing agents are used are overcome; and the adopted Ti source is stable to air and water, so that the defects of adopting an organic solvent and other easily-hydrolyzed Ti sources are completely avoided, and industrialization is facilitated.

The invention belongs to the technical field of environmental protection, and particularly relates to a PVC mother liquor recycling treatment device and process. The device comprises a PVC mother liquor pipeline, the PVC mother liquor pipeline is sequentially connected with an advanced oxidation reactor, a buffer sedimentation tank, a ceramic membrane filter, a heat exchanger and a reverse osmosis desalting device, a concentrated water outlet of the reverse osmosis desalting device is connected with the ceramic membrane filter through a backwashing pump, and the ceramic membrane filter and the advanced oxidation reactor are both connected with an ozone generator; the PVC mother liquor directly enters a Fenton + ozone advanced oxidation reactor without cooling, Fenton-ozone advanced oxidation is carried out, then a ceramic membrane filter is adopted for ceramic membrane filtration, after heat exchange, filtered water is directly subjected to reverse osmosis desalting treatment, produced water is recycled, and concentrated water is used for backwashing the ceramic membrane filter. According to the method, high-quality recovery of the PVC mother liquor can be realized, the COD discharge amount and the water taking amount of a factory are reduced to a great extent, and the benefits of PVC production enterprises can be effectively increased.