59results about How to "Improve the effect of fluoride removal" patented technology

The invention provides a device for removing fluorine ions in groundwater, which comprises water inlet devices (1), a reaction device (2), ultra-filtration devices (3) and aeration devices (4), wherein the water inlet devices (1) are arranged on the reaction device (2) and are provided with material feed devices; the ultra-filtration devices (3) are arranged in the reaction device (2); the aeration devices (4) are arranged at the bottom of the reaction device (2) and aerate by aeration holes (16) on the aeration devices (4); the ultra-filtration devices (3) are provided with outlet pipes (5); and first water pumps (6) are arranged on the outlet pipes (5). The invention further provides a method for removing fluorine by the device for removing fluorine ions. The device for removing fluorine ions in groundwater has the characteristics of simple structure, convenient use, low cost, good fluorine removing effect, and high effluent quality.

The invention discloses a deep treatment method of fluorine-containing waste water and belongs to the technical field of treatment of the fluorine-containing waste water. The deep treatment method comprises the following steps: leading the fluorine-containing waste water to enter a reaction tank 1, regulating the pH (Potential of hydrogen) value of the waste water, staying for 10 min and then introducing upper-layer waste water into a reaction tank 2, adding GMS-F1 and CaF2, stirring for reaction and then introducing upper-layer waste water into a reaction tank 3, adding GMS-F5, stirring for reaction and then introducing upper-layer waste water into a reaction tank 4, adding a flocculating agent, stirring for reaction and then introducing upper-layer waste water into a sloping plate precipitation tank for treatment, and leading supernatant to flow into a buffering tank 1; introducing waste water in the buffering tank 1 into a reaction tank 5, adding the GMS-F5, stirring for reaction and then introducing upper-layer waste water into a reaction tank 6, regulating the pH value of the waste water, staying for 10 min and then introducing upper-layer waste water into a reaction tank 7, adding the flocculating agent, stirring for reaction and then introducing upper-layer waste water into the sloping plate precipitation tank for treatment, and leading supernatant to flow into a buffering tank 2; introducing waste water in the buffering tank 2 into a sand filtering tank, filtering, and then discharging. The deep treatment method disclosed by the invention has the advantage that after the fluorine-containing waste water is treated by the method, the content of fluorine ions in the discharged water can be lower than 1 mg/L.

The invention relates to the technical field of wastewater treatment. The invention discloses a wheat straw biochar adsorbing material for removing fluorine in water and a preparation method thereof.By adding biochar into a modifier solution containing lanthanum and aluminum and then slowly dropwise adding a sodium hydroxide solution to modify the biochar, an aluminum form with high charge and high polymerization degree is formed on a surface of the biochar, the fluorine removal performance of the modified biochar is improved in an acid-base range environment of which the pH value is less than 7, and the fluorine removal rate can be higher than 90% when the modified biochar adsorbs fluorine.

The invention discloses a preparation and regeneration method of a water treatment defluoridation material. The method comprises the following steps of: A, selecting raw materials: selecting natural calcium and magnesium minerals as the raw materials; B, crushing and sieving the raw materials; C, not calcining or calcining particles in a furnace; D, closing a heating device, cooling and taking the raw materials; E, placing the calcined raw materials into a container or directly placing the non-calcined raw materials into the container after the process B, adding phosphoric acid or a mixed solution of phosphoric acid and calcium hydrophosphate to soak the raw materials, and removing acid liquor after the treatment is completed; F, soaking the raw materials by using sodium hydroxide or a potassium hydroxide solution, cleaning by using clear water after the solution is removed, and drying to obtain a defluoridation filter material; and G, regenerating the saturated filter material by using sodium hydroxide or white alum. The preparation and regeneration method of the water treatment defluoridation material, provided by the invention, has the advantages of low cost, simple production cost, wide application range of the filter material about water quality and pH, convenience for use, large absorption capacity and free secondary pollution; furthermore, the water treatment cost is reduced greatly, and the treated water is good in taste, stable in water quality and high in safety, and can be regenerated for many times.

The invention relates to a method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide. Firstly free form fluorine in water is converted into complexation state fluorine by controlling appropriate pH value condition, aluminium salt form and throwing amount or the like; calcium hydrate and aluminium salt are introduced for realizing coacervation process and providing active adsorption sites with abundant surface hydroxies, thereby the dissolved state fluorine in water is converted into particulate type fluorine by coacervation and absorption effects; dissolved state fluorine is further removed after water flows though an absorption fixed bed reactor filled with defluorination adsorption material based on aluminium base composite metal oxide; finally, water flows through a filter reactor, and colloid, particle and other impurities contained in the absorption fixed bed reactor water outlet are removed. Fluorine in the drinking water is removed by using the method provided by the invention, and the processed water can reach the WHO, USEPA and other related standards and national drinking water standard (GB5749-2006).

The invention discloses a method for treating fluorine-containing reuse water. The method comprises the following specific steps: (1) pretreatment; (2) flocculation precipitation; (3) filtration-reverse osmosis membrane filtration; (4) total organic carbon (TOC) degradation and ultraviolet sterilization; (5) electrodeionization (EDI) treatment; (6) TOC degradation and ultraviolet sterilization; and (7) precise filtration. The invention has the advantages that water quality of an effluent can reach a standard of ultra-pure water, fluorine removal efficiency is high, the recycling rate of wastewater is high, and operation cost is low.

The invention relates to a method and a device for removing fluorides in wastewater step by step and aims at solving the technical problems of difficulty in reaching standard of effluent and in sludgesedimentation, high cost and low efficiency. The method comprises the following steps of (1) sequentially performing lime feeding, pH value regulation, coagulation and first high-density integrationreaction on the wastewater to perform primary treatment on the fluorides in the wastewater; and (2) sequentially performing hardness removal by softening and second high-density integration reaction on the wastewater treated in the step (1) to perform secondary deep treatment on the fluorides in the wastewater. The method and the device can be widely applied to the field of fluoride removal of industrial wastewater.

The invention provides a production method of an iron and aluminium compound bone char fluorine removal agent and the produced fluorine removal agent. The production method comprises the following steps of (1) thoroughly washing the surfaces of livestock bones, and at 400-450 DEG C, conducting carbonization for 1.5-2 h to obtain bone char; (2) grinding and sieving the bone char obtained in the step (1) after cooling the bone char obtained in the step (1), and conducting drying after conducting washing to obtain bone char particles; and (3) soaking the bone char particles obtained in the step (2) in a Fe2(SO4)3 solution in a mass percentage concentration of 2-8% according to a solid to liquid ratio of 1 to (2.5 to 10) for 0.3-0.7 h, conducting drying after conducting washing, then accordingto a solid to liquid ratio of 1 to (3 to 8), soaking the bone char particles in a Al2(SO4)3 solution in a mass percentage concentration of 3-10% for 0.5-1.5 h, and conducting drying after conductingwashing to obtain the Al2(SO4)3-Fe2(SO4)3 compound bone char fluorine removal agent. The adsorption capacity of the iron and aluminium compound bone char fluorine removal agent is 8.5 times of that ofbone char which is not loaded with iron and aluminium ions, so that a fluorine removal effect is excellent.

The invention discloses an MgO/MgCO3 compound adopting a micro-nano hierarchical structure and an application of the MgO/MgCO3 compound serving as a fluorine remover. According to the MgO/MgCO3 compound adopting the micro-nano hierarchical structure, characteristics of low energy consumption, simplicity, easiness in operation and the like of a water bath device lower than 100 DEG C are used and chip inorganic salt is taken as the raw material for preparation of the MgO/MgCO3 compound adopting the uniform micro-nano hierarchical structure and serving as the fluorine remover to be uniformly dispersed in water so as to absorb fluorinions in water. According to the micro-nano hierarchical structure of the MgO/MgCO3 compound, the specific surface area of the material is increased, the fluorine absorbing surface active sites of the material are increased, so that the fluorine absorbing effect of the adsorbent is improved greatly. The MgO/MgCO3 compound fluorine remover adopting the micro-nano hierarchical structure has a wide apparition range for the pH value in water and has remarkable application effect on treatment of fluorine-containing water.

The invention discloses a method for removing fluoride from wastewater. The method comprises pre-treatment, internal electrolysis reaction, precipitation reaction and coagulation reaction. The combination of calcium hydroxide and OH<-> which is produced in the internal electrolysis reaction in aluminium and copper bimetal is adopted for increasing the pH value. The addition of calcium hydroxide is greatly reduced, and compared with a conventional calcium salt precipitation method, the method overcomes the problem that a CaF2 precipitate coats the surfaces of Ca(OH)2 particles. Compared with a conventional fluoride removal method of aluminium salt complexation and calcium salt coagulation, the method adopts humic acid which widely exists in nature and is low in price as an adsorbent and a flocculant. Aluminum fluoride complex ions in wastewater can be adsorbed, and the addition of Ca(OH)2 is reduced. The effect of fluoride removal is improved, and the cost of fluoride removal is reduced. Aluminum ions can be effectively removed from the wastewater, so that the residue of aluminum in the processed outlet water is greatly decreased, and secondary pollution is prevented from generation. The method is simple in control parameters, mild in condition, and easy to apply, and is suitable for massive industrial production.

The invention discloses a fluorine removal device and process for fluorine-containing wastewater, belongs to the technical field of industrial wastewater treatment, and solves the problem that: in the prior art, fluorine removal processes and fluorine removal devices used by the processes for fluorine-containing wastewater easily cause other ions to exceed the standard. The device comprises a buffer tank, the buffer tank is connected to a wastewater pump, the wastewater pump is connected with a first-stage reaction tank, the first-stage reaction tank is connected with a second-stage reaction tank, the second-stage reaction tank is connected with a third-stage reaction tank, the third-stage reaction tank is connected with a settling tank, the bottom of the settling tank is connected with a sludge pump, the settling tank is further connected with a dispensing tank, the dispensing tank is connected with a calcium salt lifting pump, and the calcium salt lifting pump is connected with the first-stage reaction tank. The device is used for safe and low-cost fluorine removal of the fluorine-containing wastewater, the cost is reduced by using the calcium sulfate, and chloride ions are prevented from exceeding the standard.

A preparation method of a fluorine removal adsorbent modified by a biopolymer composite material comprises the following steps: respectively dissolving chitosan and pectin in deionized water or acid, mixing and heating the two solutions, and carrying out a biopolymer cross-linking reaction; adding a molecular sieve soaked in deionized water into the mixed solution, performing reduced pressure distillation, adding chloroacetic acid and a sodium hydroxide aqueous solution, and grafting the chloroacetic acid to modify the chitosan-pectin biopolymer composite material; adding metal nitrate dissolved in a mixed solution of ethanol and water into the modified molecular sieve, performing reduced pressure distillation, adding a sodium hydroxide solution, stirring at room temperature, and doping metal ions into crystal lattices of the modified polymer; and filtering redundant mixed solution, washing to be neutral with de-daubing water, and drying in a drying oven to obtain the modified defluorination adsorbent. The method is simple in preparation process, low in cost, easy to recycle and high in defluorination efficiency in wastewater.

The invention relates to a functionalized silicon dioxide modified defluorination material and preparation and an application thereof, and a preparation method of the functionalized silicon dioxide modified defluorination material comprises the following steps: reacting acidified mesoporous silicon dioxide nanoparticles with chitosan oligosaccharide in an acidic aqueous solution, and after the reaction is completed, obtaining chitosan oligosaccharide modified mesoporous silica nanoparticles; reacting chitosan oligosaccharide modified mesoporous silica nanoparticles with dicarboxylic acid in an acidic aqueous solution, then reacting with a metal compound, and treating in an alkaline solution after the reaction is completed so that metal hydroxides are generated on the surfaces of the mesoporous silica nanoparticles, and obtaining the functionalized silica modified defluorination material. According to the functionalized silicon dioxide modified fluorine removal material, dicarboxylic acid connected with chitosan oligosaccharide is used for chelating metal ions, the bonding stability of the metal ions is improved, and the modified material can remove fluorine ions through the dual effects of ion exchange and electrostatic adsorption.

The invention provides a process for defluorinating drinking water of a mining area by using modified hydroxyapatite. After hydroxyapatite is modified by the disodium 5'-ribonucleotide, phosphate radicals in the disodium 5'-ribonucleotide and Ca<2+> in the hydroxyapatite form chemical bonds, so that crystal lattices of the hydroxyapatite generate defects, and the crystallinity is reduced; and meanwhile, gaps of the hydroxyapatite are increased by other parts of the disodium 5'-ribonucleotide molecules, and the porosity and the specific surface area of the hydroxyapatite are increased. Therefore, the defluorination capability is improved.

The invention relates to a synthesis method of an adsorbent for removing fluorine in high salt, and belongs to the technical field of separation of fluorine-containing wastewater. The synthesis method of the adsorbent comprises the following steps: (1) swelling chloromethylated resin in an organic solvent, respectively adding an alkali and a quinoline amide derivative, stirring and reacting to obtain a mixture containing resin, and carrying out solid-liquid separation to take a solid phase which is modified chloromethylated bead resin 1; (2) adding a quinoline derivative and the organic solvent into the modified chloromethylated bead resin 1 in the step (1), stirring and mixing, and carrying out heating reflux reaction to obtain chloromethylated bead modified resin 2; and (3) adding a nitrate solution into the chloromethylated bead modified resin 2 obtained in the step (2), and reacting to obtain the defluorination adsorbent after the reaction is finished. The prepared modified defluorination material is simple in preparation process, low in cost, easy to recycle and high in defluorination efficiency in wastewater.

The invention provides a fluorine-containing industrial wastewater treatment system and a treatment method thereof. The method comprises the steps of pH adjustment, primary fluorine removal, secondary fluorine removal, precipitation clarification, resin fluorine removal and sludge treatment. According to the defluorination treatment method, the treated high-concentration fluorine-containing wastewater is stable in effluent and can reach the discharge standard of less than 10mg/L, and the treated wastewater can be recycled and also can be directly discharged.

The invention provides an efficient rare earth modified defluorination material which is an adsorbent prepared by surface reaction of an amine functionalized rare earth chelate and positively charged magnesium oxide, and the content of the amine functionalized rare earth chelate is 10-25 wt.%. Meanwhile, the invention discloses a preparation method of the material. The preparation method comprises the following steps: 1) preparing magnesium carbonate; 2) preparing positively charged magnesium oxide; (3) preparing a rare earth chelate; (4) preparing an amine functionalized rare earth chelate; and (5) preparing the efficient rare earth modified defluorination material. According to the invention, the low-concentration fluorine-containing wastewater or underground water can be reduced to below 1mg/L of the national drinking water standard, and the fluorine removal requirement of the low-concentration fluorine-containing water can be met even under the influence of some complex environments.

The invention provides a reaction system for removing hydrogen fluoride in hydrogen chloride. The system comprises a supergravity separator, an outer circulation system, a gas holder, a material supplementing system and an absorption tower, according to the invention, the supergravity separator is applied to removal of hydrogen fluoride in hydrogen chloride, so that the gas-liquid contact is moresufficient and the removal rate of hydrogen fluoride is improved, a three-stage isolation system is used in an external circulation system, so that the influence of the precipitation of metal fluoridesalt on a feeding pump is avoided, the components of the fluorine removal agent can be maintained at the lowest limit value by adopting a regular monitoring and supplementing system, and the fluorineremoval effect is effectively improved, after the pressure is released through the gas holder, moisture carried by the gas after the gas is in contact with the fluorine removal agent can be effectively removed, and desorption and regeneration of the absorption tower are facilitated. According to the system, hydrogen fluoride is removed and adsorbed in a graded mode, hydrogen fluoride with different concentrations can be effectively removed, and the application range is wider.