264 results about "SULFATE ION" patented technology

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention provides a method, a device and equipment for predicting corrosion current and corrosion of steel bars in concrete in a low-pressure environment, and belongs to the technical field of engineering simulation modeling. The method comprises the following steps: establishing a coupling transmission model in concrete considering oxygen concentration, sulfate ion diffusion behavior and chloride ion diffusion behavior; building a reinforcement corrosion current density and corrosion depth prediction model for predicting the number of charges at different positions of the reinforcement in the concrete, and calculating the corrosion depth and the corrosion product content based on the corrosion current density; and establishing a linear elastic damage model for simulating concrete damage evolution caused by steel bar corrosion according to the corrosion product content output by the steel bar corrosion current density prediction model so as to realize accurate prediction of corrosion and damage. According to the method, oxygen concentration changes under low air pressure are considered, oxygen diffusion is described, output of a transmission model serves as a dynamic variable to be introduced into the corrosion current calculation process, and the accuracy of corrosion current and steel bar corrosion prediction is improved.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention provides a BDO (1, 4-butanediol) wastewater treatment process with high sulfate content, which comprises the following steps: carrying out electrochemical oxidation treatment on BDO (1, 4-butanediol) wastewater with high sulfate content; introducing the obtained BDO wastewater into an anaerobic reaction device for anaerobic reaction to reduce sulfate ions into hydrogen sulfide and oxidize organic matters to reduce COD (Chemical Oxygen Demand); effluent sequentially flows back to the circulating desulfurization device and the air floatation device; carrying out aeration treatment in the circulating desulfurization device so as to oxidize hydrogen sulfide into elemental sulfur; elemental sulfur is recycled in the air flotation device, and part of effluent of the air flotation device and part of effluent of the anaerobic reaction device flow back to inlet water of the anaerobic reaction device; part of effluent of the air floatation device and part of effluent of the anaerobic reaction device are combined and then are sequentially introduced into an aerobic activated sludge tank with a membrane bioreactor and an ozone catalytic oxidation tank. Effluent can enter a subsequent ultrafiltration reverse osmosis membrane system to be purified, and water produced by the membrane system is recycled as reclaimed water.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

The present application discloses a method and device for determining the reaction intensity of TSR in a reservoir, which belongs to the technical field of oil and gas reservoirs. The method comprises: obtaining sulfate ions SO4 in the formation water of the target reservoir; 2‑ The concentration of chloride ions Cl ‑ Calculate the concentration of SO4 in the formation water of the target reservoir 2‑ The concentration value and Cl ‑ The ratio of the concentration values ​​of SO4 in the formation water of the target reservoir; 2‑ The concentration value and Cl ‑ The reaction intensity of the thermochemical sulfate reduction reaction TSR in the target reservoir is determined by the ratio of the concentration values ​​of . The present application can more accurately determine the reaction intensity of the TSR in the reservoir.

The invention relates to the technical field of scale inhibitors, in particular to a scale inhibitor, a preparation method and application. The scale inhibitor is prepared from the following raw materials in parts by weight: 30 to 35 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 6 to 10 parts of polyepoxysuccinic acid, 5 to 8 parts of polyethylene oxide fatty alcohol ether, 5 to 8 parts of sodium dodecyl benzene sulfonate, 4 to 6 parts of nano zinc oxide, 6 to 9 parts of metakaolin hybridization regulated filling agent, 5 to 7 parts of modified nano titanium dioxide agent, 4 to 6 parts of silane coupling agent KH560 and 30 to 35 parts of deionized water. According to the scale inhibitor, raw materials are blended, the scale inhibition effect of calcium carbonate and calcium sulfate ions of a product system is enhanced, the corrosion rate and the antibacterial effect of a product are optimized, the performance coordination balance of the product is excellent, and meanwhile the temperature-resistant stability effect of the product is remarkable.

The invention belongs to the technical field of building materials, and particularly relates to early strength type quick-setting concrete based on a composite cement system and a preparation method thereof, the early strength type quick-setting concrete comprises 400 parts of water, 400-460 parts of cement, 700-780 parts of sand, 980-1150 parts of gravel, 25-30 parts of cellulose, 18-26 parts of polyvinyl alcohol and 30-35 parts of an accelerator; aluminum ions and sulfate ions are subjected to a polymerization reaction to form a polymer with a specific structure, and an organic high-molecular polymer is added, so that the organic high-molecular polymer interacts with an aluminum sulfate polymerization product, and the performance of the accelerator is further modified.

The present application relates to the technical field of manganese industry wastewater treatment device, and particularly discloses a comprehensive treatment method for electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen, which comprises the steps of removing manganese, solid-liquid separation of manganese removal wastewater, adding a precipitant for precipitation reaction, etc.; according to the characteristics of electrolytic manganese production wastewater containing manganese, ammonia nitrogen, calcium, magnesium, sulfate ions, etc., by fully utilizing the magnesium ions in water, more than 95% of the manganese ions and all the phosphate radicals in water can be selectively removed by using slurry of quicklime, without introducing excessive calcium ions, effectively reducing the dosage of magnesium salt and phosphoric acid reagent, reducing the treatment cost, so that the electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen with ammonia nitrogen > 50 mg / L can be completely treated to reach the standard by using the ammonium magnesium phosphate precipitation method, and the indexes of manganese, ammonia nitrogen, phosphate radical and pH value after treatment can all reach the first standard limit value requirement of the Comprehensive Sewage Discharge Standard (GB 8978-1996), and the manganese, ammonia nitrogen and magnesium resources in the wastewater can be recovered.

The present application relates to the technical field of health, environmental management and resource development, and discloses an alkaline-sulfur oxidizing bacteria and its application in water pollution treatment and bioleaching. The alkaline-sulfur oxidizing bacteria is named 381-2, which has been preserved in the China General Microbiological Culture Collection Center on December 23, 2024, and the preservation number is CGMCC No. 33017; the microbial classification name is Stutzerimonas sp. The present application isolates a new species of Stizolobium strain from a deep-sea hydrothermal area Stutzerimonas sp. . The strain has strong and rapid oxidation ability of thiosulfate ions, and also has the characteristics of producing alkali, so it can be applied to the fields of water pollution treatment and bioleaching.

Methods for photocatalytic water splitting of produced waters may comprise introducing a photocatalyst comprising a semiconductor to a produced water comprising ions of sodium, chloride, calcium, magnesium, potassium, sulfate, barium, iron, lithium, strontium, or any combination thereof; in the presence of sunlight, allowing the photocatalyst to facilitate a reduction-oxidation reaction of a plurality of water molecules from the produced water; and obtaining hydrogen and oxygen.

The application provides a method for separating magnesium and lithium in brine, comprising the following steps: pretreating the brine to obtain pretreated brine; performing primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; the nanofiltration membrane selected for the primary nanofiltration is a carboxylated MOF modified nanofiltration membrane; and the raw materials for preparing the carboxylated modified nanofiltration membrane comprise a support, piperazine, carboxylated ZiF-8 and carboxylated Uio-66. The application reduces the risk of nanofiltration membrane pollution by pretreating the brine, pumps the pretreated brine into a nanofiltration system, generates a cut-off liquid rich in magnesium and sulfate ions and a high-lithium permeate liquid, performs secondary nanofiltration on the cut-off liquid to recover lithium, the secondary cut-off liquid can be used as a resource, the permeate liquid enters a reverse osmosis membrane, the lithium content is concentrated, the concentrated lithium liquid enters a lithium precipitation process, and the method for separating magnesium and lithium in the nanofiltration process realizes the impurity removal process for lithium recovery.

The invention belongs to the technical field of sewage treatment, and particularly relates to a sulfur conversion driven chlorohydrocarbon polluted underground water treatment method. According to the method, the multifunctional biochar is prepared through high-temperature ammonia gas modification, PS can be activated to oxidize and remove chlorinated hydrocarbon, then sulfide reduction is catalyzed to remove residual chlorinated hydrocarbon, a porous structure of BC provides pollutant adsorption and fixation functions, and after MFBC, PS and sulfate reducing bacteria are sequentially added into a chlorinated hydrocarbon pollution medium, the pollution medium is subjected to high-temperature ammonia gas modification to remove the residual chlorinated hydrocarbon. The sulfur-containing species undergo a cyclic conversion process from PS-sulfate ion-sulfide-elemental sulfur-sulfate ion. In the conversion process, various oxidation and reduction active substances can be used for effective detoxification of chlorinated hydrocarbon, and MFBC and sulfate reducing bacteria play a key role in mediating sulfide conversion. According to the method, the chlorohydrocarbon in the high-permeability medium can be rapidly removed firstly, and then the chlorohydrocarbon slowly released by the low-permeability medium can be slowly removed at low cost. And the method is low-carbon and environment-friendly, has no secondary pollution such as heavy metals and has obvious application advantages.

The invention relates to the field of combined application of MOF (Metal Organic Framework) crystal material synthesis and a sonodynamic antibacterial technology, in particular to an Eu-TCPP-SO4 crystal as well as a preparation method and application thereof. The rare earth-porphyrin complex Eu-TCPP-SO4 crystal with a specific crystal structure is constructed by virtue of coordination and self-assembly of europium nitrate pentahydrate, meso-tetra (4-carboxyl phenyl) porphyrin (TCPP) and sulfate ions. The Eu-TCPP-SO4 crystal disclosed by the invention as a sound-sensitive agent has high sound-sensitive activity and good stability, overcomes the limitations of low efficiency and poor stability of the sound-sensitive agent in the prior art, and can provide a safer and more effective solution for actual antibacterial application.

The invention belongs to the technical field of sewage treatment, and provides a filter material, a filter unit and a filter system.According to the filter material, the filter unit and the filter system for manganese ion-containing sewage treatment, a filter plate is provided with water through holes in the filter direction so that manganese-containing sewage can smoothly pass through the filter plate, and the filter plate is provided with water through holes in the filter direction; meanwhile, sufficient contact of sewage and filter plate materials is guaranteed, the forming direction of the water through holes is consistent with the sewage flowing direction, and sewage flowing resistance can be reduced. Through the synergistic effect of the porous structure of the adsorption foam concrete and various adsorption materials, synchronous and efficient removal of manganese ions and sulfate ions is realized, and the limitation of single pollutant treatment in the prior art is solved; due to the loose porous structure and reasonable raw material ratio, the adsorption efficiency is ensured, and the problem of secondary pollution caused by a chemical precipitation method is avoided; the material of the filter plate has adsorbability and structural strength, and is suitable for complex terrains and working conditions of multi-mountain mineral areas.

The invention provides a method for separating calcium and sulfur in industrial byproduct gypsum. The method comprises the following steps: mixing and stirring industrial byproduct gypsum and a cosolvent solution to react, and filtering after reacting for a period of time to obtain a first filtrate and a first filter residue; adding alkali metal hydroxide into the first filtrate to form calcium hydroxide slurry, and introducing carbon dioxide to precipitate calcium ions in the first filtrate to obtain a product calcium carbonate and second filtrate; adding calcium chloride into the second filtrate, reacting sulfate ions in the second filtrate with the added calcium chloride at a certain temperature, and filtering to obtain calcium sulfate and a third filtrate mainly containing potassium chloride; alkali metal chlorine salt is used as a cosolvent, the solubility of calcium sulfate in a liquid phase is improved, and then separation of calcium sulfate and impurities in the byproduct gypsum is achieved through solid-liquid separation; compared with an organic solvent as a phase transfer solution, solid-liquid separation with alkali metal chlorine salt as a cosolvent is more convenient and quicker, and the cost is low.

The invention discloses a green liquid salt and a production process thereof, and relates to the technical field of liquid salts.The production process comprises the steps that a metal organic framework is taken and added into a Tris-HCl buffer solution, uniform mixing is conducted, dopamine hydrochloride is added, stirring, centrifuging, washing and drying are conducted, and the metal organic framework of a core-shell structure is obtained; the preparation method comprises the following steps: adding sulfonated polysulfone, a core-shell structure metal organic framework and polyvinylpyrrolidone into N-methyl pyrrolidone, stirring until the materials are completely dissolved, and carrying out ultrasonic treatment to obtain a membrane casting solution; taking the membrane casting solution, pouring on a glass plate, and performing blade coating, water bath, phase inversion and soaking to obtain a nanofiltration membrane; taking brine, adding modified charcoal, adsorbing, and performing ultrafiltration through an ultrafiltration membrane to obtain ultrafiltration filtrate; and carrying out nanofiltration on the ultrafiltration filtrate through a nanofiltration membrane to obtain liquid salt. Sulfonic acid groups introduced into the nanofiltration membrane are negatively charged, and the interception rate of the nanofiltration membrane on sulfate ions, calcium ions and magnesium ions is improved through electrostatic interaction and size screening.

The application discloses a method for removing impurities from a lithium-containing solution, application and system thereof, and belongs to the technical field of lithium ion battery materials. The method provided by the application comprises the following steps: reacting the lithium-containing solution with a calcium compound, and then performing solid-liquid separation; the calcium compound comprises at least one of calcium oxide and calcium hydroxide; the lithium-containing solution further contains magnesium ions and sulfate ions; and the mass ratio of the one with a larger amount in the magnesium ions and the sulfate ions to the calcium compound is 1:1.05-1.3. The method provided by the application can remove most of calcium, magnesium and sodium impurities in the lithium-containing solution through one-step method, and the impurity removal step is simple and low in cost. The application also provides application of the method and a system for implementing the method.

The invention belongs to the technical field of solid waste resources, provides a red-mud-based unfired prefabricated part and a preparation method thereof, and solves the problem that a large amount of red mud cannot be consumed. The concrete is prepared from the following raw materials: 30-35 parts of red mud, 15-20 parts of fly ash, 20-30 parts of quartz sand, 5-8 parts of fluorite, 5-15 parts of desulfurized gypsum, 5-8 parts of Portland cement, 1-3 parts of quick lime, 0.1-1 part of a water reducing agent, 0.5-1 part of a retarder, 2-3 parts of an expanding agent, 1-2 parts of fibers and 10-12 parts of water. According to the method, quicklime is used for providing an alkaline environment, the excitation effect of fluorite and gypsum is activated under the high-alkali condition, F in the fluorite strongly destroys glass bodies of red mud and fly ash to enable the glass bodies to release active silicon oxide, aluminum oxide and other components, sulfate ions in the gypsum are combined with active aluminum ions, and the effect of activating the red mud and the fly ash is achieved. The obtained ettringite improves the early strength of the prefabricated member, and realizes waste reutilization.

The invention provides a coastal environment salt mist corrosive component concentration intelligent detection system, which comprises a dust removal device, a filter chamber, an air outlet mechanism and a control system, and a salt mist collection device can collect salt mist particles in air passing through the dust removal device into a monitoring device; the monitoring device can monitor the weight of salt mist particles in air flowing through the filter chamber and the content of internal components, and comprises a salt mist dissolving device, a component detection device and a bottom plate; the component detection device comprises a chloride ion detection box, a second gravity sensor, a first water pipe, a second water pipe, a first water pump, a second water pump, a transfer box and a third gravity sensor, and the weight of sulfate ions is obtained by subtracting the weight of chloride ions measured by the second gravity sensor from the weight of salt mist particles measured by the first gravity sensor; therefore, the corrosive components in the salt mist can be intelligently classified and analyzed, and protection measures are specifically applied to the concrete structure.

The present invention provides a method for resource utilization of circulating cooling water wastewater from thermal power plants, belonging to the field of environmental protection technology. The method first involves softening the circulating cooling water with lime-soda to remove temporary calcium and magnesium ions, and then transferring the resulting softened sludge to a desulfurization system for use as a desulfurizer. The effluent from the lime-soda softening process is then passed through an ultrafiltration system to further remove suspended solids, producing ultrafiltration product water. The ultrafiltration concentrate and backwash effluent are then recycled to the front end of the lime-soda softening process for solid-liquid separation. The ultrafiltration product water is then passed through a sulfate adsorption device. The adsorption filtrate is then concentrated through reverse osmosis, and the reverse osmosis product water is recycled to the circulating cooling water system. The reverse osmosis concentrate is then passed through a bipolar membrane system to produce hydrochloric acid and sodium hydroxide solution. After the sulfate adsorption device is saturated, a portion of the reverse osmosis concentrate is introduced into the sulfate adsorption device, and the desorbed liquid is recycled to the desulfurization system. The sulfate ions in the desorbed liquid combine with the calcium ions in the desulfurizer to form gypsum. This method minimizes acid and alkali consumption and waste salt production in thermal power plants.

The invention discloses a cyclic nitroxide free radical positive electrode electrolyte and a neutral aqueous organic flow battery, and belongs to the technical field of organic flow batteries. According to the positive electrode electrolyte, halide ions (such as chloride ions) in an existing supporting electrolyte are replaced by inorganic salt composed of anions such as sulfate ions and bis (trifluoromethanesulfonyl) imine ions, and the precipitation side reaction caused by the chloride ions in the charging and discharging process is avoided. Sulfate and bis (trifluoromethanesulfonyl) imine salt have wider electrochemical stability windows, and anions of the sulfate and bis (trifluoromethanesulfonyl) imine salt have a regulation effect on a free water structure, so that a more stable solvated water environment is favorably formed, strong solvating behaviors of H < + > and OH <-> are reduced, a decomposition reaction of water in the electrolyte is inhibited, and the tolerance of a system to pH fluctuation is improved; the working potential window of the electrolyte is widened, and the operation stability and the electrochemical performance of the flow battery under the neutral or near-neutral condition are improved. According to the scheme, a new material design thought and an application basis are provided for constructing a high-stability and high-safety aqueous organic flow battery.

The present application relates to a kind of hypochlorite detection probe based on pyridine salt and preparation method thereof.The fluorescence probe structure is as shown in formula I.The fluorescent molecular probe of the present application is prepared from o-alkynyl aldehyde as raw material, by condensation reaction with pyridine salt.The probe synthesis method is simple, and the reaction condition is mild, and the yield of target compound is high.The fluorescent molecular probe described in the present application has stable optical performance, high sensitivity for hypochlorite detection, low detection lower limit, detection limit is 0.38 μM, response range is 5-200 μM.It has good selectivity, and has no response to fluoride ion, iodine ion, perchlorate ion, bisulfate ion, sulfate ion, acetate ion, thiocyanate ion, sulfur ion, etc.The fluorescent molecular probe described in the present application has practical application value in the field of biochemistry and environmental chemistry, especially the detection of hypochlorite ion in water, etc.

The invention relates to the technical field of corn soaking water treatment, in particular to a process method for preparing two liquid protein products and recovering potassium chloride by taking corn soaking water as a raw material, which comprises the following steps: adsorbing supernate obtained by standing and settling the corn soaking water by using a resin column, filtering collected effluent, concentrating collected filtrate, and concentrating the concentrated filtrate. Respectively collecting a concentrated solution and a permeate solution; carrying out vacuum concentration on the collected concentrated solution, cooling, carrying out suction filtration, respectively collecting a filter cake and a filtrate, combining the collected filter cake with a leacheate obtained by leaching the filter cake, carrying out concentration treatment, adding ethanol, cooling, and carrying out suction filtration, so as to obtain the collected filtrate, namely a first liquid protein product; and concentrating the collected permeate, adding ethanol, stirring, cooling, carrying out suction filtration, and drying the collected filter cake to obtain the potassium chloride product. According to the process method, the first liquid protein product and the second liquid protein product which are low in magnesium ion content and sulfate ion content can be obtained, and potassium chloride is recycled.

Relates to a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the positive active material comprises Na4-aAbFe3-cBd (PO4) 2-eDf (P2O7), A comprises at least one of Li or K, B comprises a metal element, D comprises at least one of halogen anions, silicate ions, sulfate ions or borate ions,-0.12 < = a < = 0.12, b > = 0, 0 < = c < = 0.3, d > = 0, f > 0, and 0 < e < = 0.1.

This invention discloses a method for preparing organic sulfates, comprising the following steps: using persulfate as the sulfate source, and achieving the functional group transformation of a free radical precursor compound through the free radical anion of the sulfate ion, thereby preparing the organic sulfate. This invention uses persulfate as the source and, through a free radical addition mechanism, acts on the free radical precursor substrate. Persulfate, as a sulfate free radical anion, participates in the functional group transformation of the organic compound, resulting in the efficient synthesis of organic sulfates.

The present invention provides a grouting material for gypsum / glauber's salt karst foundations, a preparation method, and an application thereof. The grouting material for gypsum / glauber's salt karst foundations comprises the following components by weight: 70 to 92 parts blast furnace slag powder, 8 to 30 parts steel slag powder, and 250 to 350 parts water. The blast furnace slag powder and steel slag powder of the grouting material provided by the present invention undergo high-temperature melting and rapid cooling during their formation, resulting in a relatively dense and stable structure. This structural stability prevents hydration reactions with water. When the grouting material reaches an environment containing gypsum / glauber's salt, the calcium oxide and aluminum oxide in the blast furnace slag powder and steel slag powder react with sulfate ions in the gypsum / glauber's salt to form ettringite, which adheres to the gypsum / glauber's salt interlayer, thereby blocking dissolution and improving the stability of the gypsum / glauber's salt karst foundation.

The wastewater treatment system according to an embodiment of the present invention is used for treating wastewater containing a sodium sulfate solution, and comprises: an electrodialysis device for separating the sodium sulfate solution of the wastewater into a first solution containing sulfate ions, a second solution containing sodium ions, and circulating wastewater from which sodium sulfate has been removed; a first membrane distillation device that extracts purified water from the first solution in order to concentrate the first solution; and a second membrane distillation device that extracts purified water from the second solution in order to concentrate the second solution. According to the wastewater treatment system disclosed by the embodiment of the invention, salt compounds and other harmful ions in the wastewater can be selectively separated through the electrodialysis device so as to effectively separate a high-concentration ionic solution. Therefore, not only can substances after wastewater treatment be recycled to the maximum extent, but also the environmental harmfulness of salt compounds can be greatly reduced.

A process method for flue gas desulfurization wastewater zero discharge treatment, comprising a pretreatment section, a concentration section and a salt separation section; the pretreatment section comprises a hardness removal adjusting tank, a heavy metal removal tank, a coagulation sedimentation tank, an aeration biochemical tank, an ozone catalytic oxidation device, a sludge concentration and dehydration unit and a sludge drying unit; the concentration section comprises a tubular microfiltration, a medium-high pressure reverse osmosis, a low pressure reverse osmosis, an electrodialysis and a biological reactor; the salt separation section comprises a nanofiltration I, a nanofiltration II, a nitrate crystallizer and a salt crystallizer; wherein the electrodialysis adopts a modified anion exchange membrane, which is modified by a polyanion modifier and beta-cyclodextrin together, so that the anti-pollution ability of the membrane is greatly increased, and the selective permeability of sulfate ions is increased; in the process method, the wastewater is not only zero discharged, but also high-purity sodium chloride and sodium sulfate are obtained, and the process method has the advantages of mild operation condition, simple operation, low energy consumption and the like.