523 results about "Solid carbon" patented technology

The invention discloses an urban low-carbon development level evaluation system based on carbon sequestration emission reduction, and the system comprises a carbon sequestration emission reduction index obtaining module which is used for obtaining all types of carbon sequestration emission reduction indexes of a current urban ecosystem; the carbon sequestration and emission reduction efficiency model establishing module is used for establishing a calculation formula of the carbon sequestration and emission reduction amount of each type of carbon sequestration and emission reduction index according to all types of carbon sequestration and emission reduction indexes of the current urban ecosystem, and then establishing a carbon sequestration and emission reduction efficiency model according to the calculation formula of the carbon sequestration and emission reduction amount of each type of carbon sequestration and emission reduction index. Establishing a carbon sequestration and emission reduction index efficiency evaluation model from the aspects of space efficiency, time efficiency and social economic efficiency; and the carbon sequestration and emission reduction efficiency evaluation module is used for inputting the values of the carbon sequestration and emission reduction indexes of each type of the current urban ecosystem into a carbon sequestration and emission reduction index efficiency evaluation model to obtain evaluation values of space, time and social economy of the current urban ecosystem.

The invention discloses rapid denitrification composite carbon source particles as well as a preparation method and application thereof. The rapid denitrification composite carbon source particle is prepared from raw materials including a slow-release skeleton, a carbon source and an optional functional modified material. The invention integrates the advantages of two solid carbon sources (natural carbon source and artificially synthesized carbon source), and develops novel composite carbon source particles with excellent performance and high cost effectiveness by designing and regulating the formula, proportion and structure. The prepared rapid denitrification composite carbon source particles can ensure that microorganisms have stable carbon source supply in the whole denitrification process, and the denitrification efficiency reduction caused by discontinuous or non-uniform carbon source supply is avoided. The rapid denitrification composite carbon source particles prepared by the invention also have the characteristics of easy biofilm formation, easy fluidization, stable carbon release, lasting carbon supply, relatively high mechanical strength, low cost, wide application range, difficulty in breaking, long service cycle and large specific surface area, and can be well applied to a biological sewage treatment system as a microbial carrier.

A thermochemical system and method for thermochemical decomposition of a hydrocarbon feedstock such as methane or natural gas within an insulated volume where the important elements of the thermochemical system are located within the insulated volume. The insulated volume contains a heater and a thermal energy storage medium in thermal communication with the heater such that it is heated by the heater and stores the thermal energy it receives by a heat storage process. The thermal energy storage medium is also configured to release the thermal energy that it stored in the form of a released heat. The insulated volume also contains a hydrocarbon pyrolysis reactor thermally coupled with the thermal energy storage medium to receive the released heat and use it for driving pyrolysis of the hydrocarbon feedstock to produce pyrolysis products containing primarily hydrogen and a solid carbon product. Pyrolysis of the hydrocarbon feedstock is driven at a high temperature, such as between 700 ° C and 2, 000 ° C.

The invention discloses a preparation method of antioxidant graphene coated copper composite conductive paste. The preparation method comprises the following steps: step 1, preparing organic matter coated copper powder; 2, the organic matter in the organic matter-coated copper powder obtained in the step 1 serves as a solid carbon source, annealing is conducted in a vacuum environment so that graphene can grow on the surface of the copper powder, and graphene-coated copper composite powder is obtained; and 3, the graphene-coated copper composite powder serves as a conductive filler of the conductive paste, and the graphene-coated copper composite conductive paste is prepared by combining a dispersing agent, a curing agent and a defoaming agent. The high-quality graphene-coated copper composite powder is obtained by growing graphene on the surface of the copper powder through the solid carbon source in the vacuum environment, then the graphene-coated copper composite conductive paste is prepared, and the preparation method is simple; compared with pure copper conductive paste, the graphene-coated copper composite conductive paste has the advantages that the resistivity is obviously reduced, and the graphene-coated copper composite conductive paste has better oxidation resistance.

An integrated system for converting hydrocarbons gases to solid carbon and hydrogen products includes a pyrolysis reactor comprising a bed of particulates disposed in a reactor vessel, a heating section in fluid communication with the pyrolysis reactor, a separator system in fluid communication with the pyrolysis reactor through the product gas outlet, and a heat exchanger configured to remove heat from the reaction product gases exiting the pyrolysis reactor. The bed of particulates comprises catalyst particles, solid carbon, and inert media. The heating section is configured to heat the inert media in a hot gas stream and lift the heated inert media to the top of the heating section to return the heated inert media through the top inert media inlet, and the separator system is configured to separate any particulates in a product gas produced in the pyrolysis reactor.

A pyrolysis system for conducting a hydrocarbon pyrolysis reaction and related systems and methods are disclosed herein. In some embodiments, the pyrolysis system includes a combustion component, a reaction chamber thermally coupled to the combustion component, and a recycling component fluidly coupled to an output of the reaction chamber. The reaction chamber can be couplable to a supply of pyrolysis feedstock. The thermal coupling allows the reaction chamber to transfer heat from the combustion component to the pyrolysis feedstock to generate a product stream that includes hydrogen gas and solid carbon. The recycling component receives the product stream and can direct a portion of the product stream into the combustion component. In some embodiments, the pyrolysis system includes a controller configured to adjust various operational parameters of the pyrolysis system based on various goals for combustion fuel consumption, hydrogen gas output, energy consumption, reactor efficiency, and / or the like.

The present invention provides a method for hydrogen-based reduction roasting pretreatment of chromite pellets, belonging to the field of metallurgical technology. The method comprises the following steps: mixing chromite powder, a binder and water to form pellets, obtaining green chromite pellets; mixing H2 and CO to obtain a reducing gas; and carrying out reduction roasting on the green chromite pellets in the reducing gas. The reduction roasting of the present invention is carried out in an H2-CO atmosphere, completely without involving the use of primary energy solid carbon, and enables the chromite pellets to obtain sufficient strength and metal pre-reduction degree before entering the ore thermal furnace, which can greatly reduce the comprehensive energy consumption and emissions in the production of ferrochrome alloy.

The invention relates to a preparation method of coarse-grained chromium carbide powder. The preparation method comprises the following steps: firstly, carrying out preliminary stirring, ball milling, pre-drying, low-temperature drying and medium-temperature pyrolysis on chromium sesquioxide powder, a dispersing agent and glycerol, so that the glycerol is pyrolyzed into solid carbon, and coating the surface of chromium sesquioxide with the solid carbon to form first-stage carbon source coated powder; mixing the powder with graphite powder and glycerol, carrying out pre-drying and low-temperature drying and shaping to obtain a two-stage carbonization column, carrying out gradient heating carbonization under a protective atmosphere to enable chromium sesquioxide and carbon to fully react to generate a chromium carbide phase mainly comprising Cr3C2, and then carrying out post-treatment to obtain the coarse-grained chromium carbide powder. According to the invention, glycerol is introduced as a main carbon source in the early stage and microcosmic coating is realized, so that the contact between the carbon source and chromium sesquioxide is more sufficient, and the reaction efficiency is improved; and meanwhile, the graphite powder is subjected to independent ball milling in advance to control the granularity, so that carbon source demolding is avoided, and better granularity control is realized. The method is flexible in process, and the product is coarse, uniform and stable in granularity.

To provide a method which enables inexpensive production with a high yield of lithium hydroxide with a low amount of impurities such as sodium from lithium-containing water including a lithium ion and a chloride ion.SOLUTION: A production method of lithium hydroxide includes: a crystallizing step of crystallizing lithium hydroxide (LiOH) from lithium-containing water including a lithium ion and a chloride ion; a solid-liquid separation step of performing solid-liquid separation treatment of concentrated liquid including the LiOH to obtain the LiOH as a solid product and filtrate; a carbonation step of producing lithium carbonate from the filtrate by carbonation; a lithium carbonate recovery step of evaporating at least a part of ammonia from a mixed liquid obtained in the carbonation step and performing solid-liquid separation treatment of the resultant treated liquid to obtain lithium carbonate as a solid product; a lithium hydroxide production step of converting the obtained lithium carbonate into LiOH followed by solid-liquid separation treatment to obtain an aqueous LiOH solution (1) as a liquid component; and a recrystallizing step of crystallizing LiOH from the aqueous solution (1).SELECTED DRAWING: Figure 2

The invention relates to the technical field of fuel cells, and mainly relates to a graphitized carbon loaded platinum-based catalyst and a preparation method thereof. The preparation method comprises the following steps: carrying out ultra-fast heating treatment on a non-graphitized solid carbon material, and graphitizing to obtain a graphitized solid carbon material; the preparation method comprises the following steps: loading platinum-based nanoparticles on a graphitized solid carbon material by an impregnation method to obtain a graphitized carbon loaded platinum-based catalyst; the condition of the ultrafast heating treatment is that the ultrafast heating treatment is carried out for 0.05-500 seconds at the temperature of 1200-3000 DEG C. The multi-defect graphitized carbon loaded platinum-based catalyst can be prepared by the preparation method, and can be used for the catalytic oxygen reduction reaction of PEMFC. The catalyst has high corrosion resistance, uniform particle distribution size and high specific surface area, and has higher performance and stability than commercial platinum-carbon catalysts.

The invention discloses a coal-fired power plant flue gas carbon capture and ammonium fertilizer co-production system and method based on an ammonia process, desulfurized flue gas sequentially passes through a saturation area, an absorption area and an ammonia washing area of a decarburization system, passes through a first-stage ammonia washing spraying layer and a second-stage ammonia washing spraying layer, and finally, purified flue gas is discharged to the atmosphere. After sodium hydroxide, sodium carbonate and a flocculating agent are added into desulfurization wastewater, obtained clear liquid is pumped into a first-stage ammonia washing spraying layer through a clear liquid conveying pump to spray and absorb escape ammonia gas, enters an absorption area slurry box after the pH value reaches the upper limit, and enters a saturation area after the pH value of the absorption area slurry box reaches the upper limit; slurry in the saturation area is subjected to solid-liquid separation through a cyclone and a centrifugal machine, and clear liquid returns to the saturation area again. And the slurry in the saturation area is separated twice by a cyclone and a centrifugal machine to obtain solid ammonium bicarbonate. According to the invention, part of desulfurization wastewater and carbon dioxide in desulfurized flue gas can be cooperatively treated, and the produced ammonium bicarbonate fertilizer can be used for producing ammonium fertilizer or compound fertilizer, and has high economic value.

The invention discloses anti-crack and anti-alpine concrete and a preparation method thereof, and relates to the technical field of concrete.The anti-crack and anti-alpine concrete is prepared from, by mass, 300-500 parts of low-heat Portland cement, 50-100 parts of carbon sequestration composite superfine powder and 10-20 parts of nano calcium carbonate; the magnesium oxide is calcined at the temperature of 500 to 600 DEG C, is compounded with the calcium sulphoaluminate, and is modified by a silane coupling agent; the phase change microcapsule is formed by packaging paraffin in a silicon dioxide shell layer, and the phase change temperature ranges from-30 DEG C to 10 DEG C; the microbial self-repairing capsule is characterized in that bacillus pasteurii is coated in a sodium alginate-montmorillonite composite carrier; according to the invention, the multi-dimensional performance breakthrough of the high-cold concrete is realized through gradient expanding agent compounding, fiber synergistic enhancement, phase change microcapsule temperature control and microbial self-repairing technologies. The drying shrinkage is reduced to 1.2 * 10 <-4 > by compounding magnesium oxide / calcium sulphoaluminate, the crack propagation is inhibited by a fiber network, and the initial crack threshold value is less than 0.15 mm.

The invention discloses a single-walled carbon nanotube and a preparation method and device thereof, and belongs to the technical field of nano materials. The device comprises an inert gas cylinder, a carrier gas injection pipeline, a gas flow controller, a cavity, a positive electrode bar, a negative electrode bar, two graphite felt electrodes woven with carbon fibers, a stainless steel screen, a filter membrane, a graphite table and a tubular furnace. When the electrode starts to discharge and the temperature of the high-temperature plasma gasification area reaches the gasification temperature of the solid carbon source and the solid catalyst, the solid carbon source and the catalyst start to be gasified, gasified reactants enter the sample growth area along with the inert gas flow to grow, and the grown single-walled carbon nanotubes reach the sample deposition area along with the gas flow. The device disclosed by the invention can generate uniform, stable and high-capacity ultrahigh-temperature plasma under normal pressure and relatively low voltage and current, and the simple and practical plasma technology is low in energy consumption, green and environment-friendly, can be used for macro preparation and is beneficial to overcoming the challenge of high-temperature synthesis.

The invention discloses a device for preparing a molten carbon fertilizer through solid waste microwave pyrolysis and waste heat recovery, and belongs to the field of solid waste treatment and recycling. The device is composed of a pretreatment unit, a microwave pyrolysis unit, a gas-solid separation unit, a gas phase treatment unit, a solid phase treatment unit and a waste heat circulation unit, solid waste enters a microwave rotary kiln after being dried and crushed, a magnetron generates microwave anaerobic pyrolysis under photovoltaic power supply, and a high-temperature gas-solid product is generated; the cyclone separator is used for separating flue gas from solid carbon, the flue gas is condensed to obtain pyrolytic oil and gas, and waste heat of medium-temperature flue gas is recovered through the heat accumulating type heat exchanger for drying; cooling the solid carbon through a heat pipe heat exchanger, recovering waste heat and liquefying urea, and mixing the solid carbon and the urea in a stirring melting pool to prepare a molten carbon fertilizer; and the waste heat backflow fan sends the carbon waste heat back to the drying chamber. The system is driven by green electricity, gas and solid phase waste heat is recovered through double paths, solid waste efficient pyrolysis-product high value-energy self-circulation is achieved, and energy consumption and carbon emission are reduced.

A reactor including a vertically oriented vessel with a gas inlet port, a distributor, a feedstock port, and a microwave generator. The reactor is designed to process a carbon feedstock to produce hydrogen gas and a hydrogen deficient carbon product, utilizing a fluidized bed provided with microwave energy. Also disclosed are methods of converting a carbon feedstock, particularly a solid carbon feedstock, into hydrogen gas and a hydrogen deficient carbon product, preferably including carbon nanotubes.

The invention relates to the field of preparation of battery grade carbonic acid, and provides a method for preparing battery grade lithium carbonate by purifying crude lithium carbonate, the preparation method comprises the following steps: screening crude lithium carbonate from different sources, mixing lithium carbonate according to a certain solid-to-liquid ratio, and stirring to obtain dispersed slurry; cO2 gas is introduced into the obtained dispersed slurry for pre-hydrogenation treatment, and mixed slurry containing a lithium bicarbonate solution and solid lithium carbonate is obtained; adding a certain amount of lithium-containing reagent into the obtained mixed slurry, and heating the mixed slurry in a stirring state to obtain treated slurry; carrying out solid-liquid separation to obtain industrial-grade wet lithium carbonate and a lithium bicarbonate solution, and carrying out thermal decomposition on the lithium bicarbonate solution to obtain industrial-grade wet lithium carbonate; and carrying out size mixing, hydrogenation, thermal decomposition and solid-liquid separation on the two parts of industrial-grade wet lithium carbonate, and drying a filter cake to obtain the battery-grade lithium carbonate. The process flow is simple, the impurity removal efficiency is high, and the battery-grade lithium carbonate can be economically and efficiently prepared from the crude lithium carbonate raw materials with different sources and different qualities.

Systems and methods for eliminating carbon dioxide and capturing solid carbon are disclosed. By eliminating carbon dioxide gas, e.g., from an effluent exhaust stream of a fossil fuel fired electric power production facility, the inventive concepts presented herein represent an environmentally-clean solution that permanently eliminates greenhouse gases while at the same time producing captured solid carbon products that are useful in various applications including advanced composite material synthesis (e.g., carbon fiber, 3D graphene) and energy storage (e.g., battery technology). Capture of solid carbon during the disclosed process for eliminating greenhouse gasses avoids the inefficiencies and risks associated with conventional carbon dioxide sequestration. Colocation of the disclosed reactor with a fossil fuel fired power production facility brings to bear an environmentally beneficial, and financially viable approach for permanently capturing vast amounts of solid carbon from carbon dioxide gas and other greenhouse gases that would otherwise be released into Earth's biosphere.

The invention belongs to the field of comprehensive utilization of chromite, and particularly relates to a method for producing high-carbon ferrochrome through chromite pellet prereduction-electric furnace smelting. According to the method, a reduction method that a reducing agent and chromite pellets are fed into a kiln separately is adopted, chromite oxidized pellets are prepared firstly and then reduced through a rotary kiln solid carbon reducing agent, and the obtained pre-reduced pellets are subjected to electric furnace smelting with a calcium flux and a magnesium flux as slagging fluxes to prepare the high-carbon ferro-chrome. The problem that according to an existing method, the metallization rate of the pre-reduced pellets and the adverse effect on electric furnace smelting caused by unstable carbon residues are solved, the production stability of the electric furnace can be improved, and meanwhile the electric furnace smelting temperature can be increased. The method is simple, controllable, low in energy consumption, high in efficiency, high in stability, low in production cost and convenient for industrial application.

The invention discloses a method for preparing high aspect ratio calcium carbonate whiskers by carbon fixation in steel smelting slag leachate, belonging to the technical field of solid waste resource utilization. The method comprises the following steps: leaching steel smelting slag to obtain calcium-magnesium leachate and leach slag; removing impurities from the calcium-magnesium leachate by a pH swing method to obtain a calcium-magnesium purified solution; capturing the gas containing carbon dioxide by an alkaline solution to obtain a carbonated solution; adjusting the pH of the calcium-magnesium purified solution to convert magnesium ions into magnesium hydroxide, placing the solution in an ultrasonic field, adding the carbonated solution to carry out a carbon fixation reaction, and washing and drying the precipitate obtained by the reaction to obtain calcium carbonate whiskers. The method not only successfully realizes the efficient resource utilization of two wastes, steel smelting slag and carbon dioxide flue gas, but also produces high value-added calcium carbonate whisker products while stably fixing carbon dioxide, and has broad application prospects and environmental value.

A system and method for production of hydrogen from natural gas using a solar powered system are provided. An exemplary solar powered system includes a feed stream including methane and a solar concentrator reactor (SCR) to form hydrogen from the feed stream by pyrolysis. The SCR includes a rotating tubular reactor, a solar absorber material disposed on the rotating tubular reactor, a solar concentrator to focus sunlight on the rotating tubular reactor, and a gas-solid filtration unit to separate solid carbon from the hydrogen. The solar powered system includes a storage tank to hold the hydrogen.

The invention discloses an aviation kerosene production method based on vinasse waste, and belongs to the technical field of kerosene preparation, and the aviation kerosene production method comprises the following steps: pretreatment: screening and cleaning vinasse, removing impurities and water, then crushing the cleaned vinasse into particles, and drying and baking by using drying equipment; pyrolyzing: feeding the pretreated vinasse into a pyrolyzing furnace for pyrolyzing; gas purification: purifying the separated gas to remove sulfides and nitrides in the gas; fischer-Tropsch synthesis reaction: introducing the purified gas into a Fischer-Tropsch synthesis reactor to form hydrocarbon molecules; separating products: separating hydrocarbons in different boiling point ranges; product refining: further processing the separated hydrocarbon products; waste treatment: solid carbon black generated in the pyrolysis process is recycled. The device provided by the invention can reduce the dependence of existing aviation kerosene production on traditional fossil fuel, saves energy, reduces carbon emission, and is beneficial to sustainable development.

High entropy alloy catalysts may be used for production of hydrogen. An example method of hydrogen production may include: introducing a hydrocarbon to a reactor, wherein the reactor contains therein a catalyst, wherein the reactor is substantially absent of oxygen and water, wherein the catalyst comprises a high entropy alloy and a catalyst support, wherein the catalyst is present in a form of a first plurality of particles, wherein the first plurality of particles is submicron-sized, wherein the high entropy alloy has an entropy, S, such that S≥12.47 J K−1 mol−1, and wherein the high entropy alloy comprises at least five of: iron, cobalt, manganese, nickel, molybdenum, copper, zinc, titanium, chromium, vanadium, aluminum, gallium, ruthenium, rhodium, palladium, silver, indium, tungsten, rhenium, iridium, platinum, gold, and bismuth; and reacting the hydrocarbon over the catalyst to produce solid carbon and hydrogen gas.

The invention belongs to the technical field of electro-catalytic materials, and particularly discloses an N / O co-doped carbon bowl electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ammonia water, silicon alkoxide, alcohol and water to obtain a mixed solution; mixing the mixed solution, resorcinol and a formaldehyde solution, centrifuging to obtain a precipitation sample, and annealing the precipitation sample to obtain solid carbon nanospheres; the solid carbon nanospheres and an alkaline solution are subjected to an etching reaction, and an N / O co-doped carbon bowl electrode material is obtained; the time of the etching reaction is 90 to 100 hours. The prepared N / O co-doped carbon bowl electrode material is a metal-free carbon catalyst, and a prepared N / O co-doped carbon bowl electrode has high ORR activity, excellent 2e-selectivity and long-term stability, and has important significance for promoting acidic electrosynthesis of H2O2.

The invention relates to the technical field of building materials, in particular to a carbon sequestration concrete solid brick prepared from coal-based solid waste and a preparation method of the carbon sequestration concrete solid brick. The carbon sequestration concrete solid brick is prepared from the following raw materials in parts by weight: 20 to 30 parts of fly ash, 65 to 75 parts of furnace bottom slag and 5 parts of cement, wherein the fly ash is secondary ash, the particle size of the furnace bottom slag is smaller than or equal to 4.75 mm, and the mark number of the cement is P.O 42.5. The method comprises the following steps: firstly, enabling carbon dioxide to react with alkaline components such as dicalcium silicate in the fly ash to form carbonate so as to realize effective carbon sequestration; and then through secondary mineralization maintenance, carbon dioxide, active components such as calcium and magnesium in the cement and dicalcium silicate which is not completely reacted in the fly ash are subjected to carbonation reaction, so that a product layer filling effect is realized. According to the invention, the building material with good carbon sequestration performance and excellent mechanical properties is prepared by utilizing industrial solid waste and carbon dioxide, so that energy conservation and emission reduction are realized, meanwhile, greenhouse gas emission is reduced, and the performance of the building solid waste brick is enhanced.

The invention discloses a comprehensive treatment device for solid wastes. The comprehensive treatment device mainly comprises key components such as a tunnel drying box, a sorting system, a material crushing table and a pyrolysis tower, the tunnel drying box achieves drying of input solid waste and tail gas purification through a hot air pipe and a negative pressure suction strip, and the environment-friendly requirement in the treatment process is guaranteed. The sorting system is composed of a light material sorting conveyor, a heavy material sorting conveyor and an air blowing sorting strip, and waste is accurately classified. The material crushing table is provided with a plurality of extrusion conveying rollers and pressing and cutting strips and used for crushing the sorted waste, and better conditions are provided for the subsequent pyrolysis process. The solid waste is finally pyrolyzed into valuable liquid fuel, combustible gas and solid carbon materials through the pyrolysis tower, and high-temperature flue gas is generated by combusting the combustible gas generated by pyrolysis in the sealed combustion box to provide heat required by pyrolysis. Finally, emission of harmful substances is greatly reduced, and carbon emission is reduced by fixing carbon through solid carbon.

The invention relates to the technical field of chemical metallurgy, and discloses a method for extracting vanadium from vanadium slag through chlorination, which comprises the following steps: S1, fully mixing vanadium slag and a solid carbonizer according to a certain proportion, adding water for wetting, and briquetting; s2, performing inert atmosphere carbonization roasting on the material obtained by briquetting in the step S1; s3, cooling the carbonized slag roasted in the step S2, and then crushing and screening; s4, carrying out chlorination reaction on the screened material obtained in S3; and S5, condensing and separating gaseous volatile components generated in the chlorination reaction in the step S4 to obtain a liquid mixture of vanadium tetrachloride and titanium tetrachloride and a solid mixture of manganese chloride and ferric chloride. According to the scheme, the chlorination efficiency of vanadium and titanium can be greatly improved, and comprehensive utilization of multi-metal resources in the vanadium slag is facilitated.

The invention provides a VOCs treatment method based on liquid metal carbon sequestration, and the VOCs treatment method comprises the following step: under energy excitation, VOCs and liquid metal are subjected to a contact reaction. According to the method for treating the VOCs through the liquid metal, the VOCs can be directly converted into solid carbon, secondary pollution products such as dioxin are avoided, the problem that active sites are coked and inactivated is avoided, operation is easy, the treatment effect is good, and the application value is high.

The present invention proposes a water treatment system that couples anoxic biofilters with artificial wetlands, belonging to the field of water treatment technology. The key technical points are: sewage is collected through a pipe network and flows into a water collection pool, and then enters a regulating / anoxic pool through a lift pump. The solid carbon source in the pool provides a carrier for microorganisms while achieving slow-release supplementation of the carbon source, thereby strengthening the denitrification reaction to remove total nitrogen. The system is then transported to a biofilter and a contact oxidation pool by a lift pump, and COD and ammonia nitrogen are removed through carbon oxidation and nitrification reactions. The effluent enters a high-efficiency clarifier, and after most of the total phosphorus and SS are removed through chemical phosphorus removal and coagulation and sedimentation, the overflow enters an artificial wetland, and is subjected to a comprehensive treatment of plant-microorganism-filler to deeply purify the pollutants and meet the discharge standards. Using the water treatment method of the present application, the effluent water quality can be improved to the Class B emission standard.

Method for softening produced oilfield brine for enhanced oil recovery, the method including dissolving gaseous carbon dioxide and a base in a produced oilfield brine that includes divalent ions to yield solid carbonates, filtering the solid carbonates to yield a softened water, and injecting the softened water into a subterranean formation.

The invention discloses a high-valued comprehensive utilization method of a waste battery diaphragm. The method comprises the following steps: S1, mixing and filtering the waste battery diaphragm and titanium white waste acid to obtain filtrate and a pretreated battery diaphragm in which part of an aluminum oxide coating is removed; wherein the pretreated battery diaphragm is subjected to catalytic pyrolysis, and aromatic hydrocarbon and solid carbon are obtained; s2, the filtrate is subjected to oxidation, polymerization and curing in sequence, and polyaluminum ferric sulfate is obtained.By means of the method, the waste battery diaphragm can be efficiently recycled, and titanium dioxide waste acid is fully purified and utilized. The method can realize selective preparation of aromatic hydrocarbon by catalytic pyrolysis of the waste battery diaphragm, can also comprehensively utilize the main component ferrous sulfate of the titanium dioxide waste acid to obtain polyaluminum ferric sulfate, can also obtain the coating material aluminum oxide of the waste battery diaphragm, and is a feasible and efficient method for realizing high-value utilization of the waste battery diaphragm and the titanium dioxide waste acid.