48results about How to "Achieve deep removal" patented technology

The invention discloses a method for preparing battery-grade iron phosphate by recovering lithium iron phosphate battery black powder, which comprises the following steps of: performing reduction acid leaching on the lithium iron phosphate battery black powder to obtain acid leaching liquid; adding sodium silicate into the acid leaching solution to adjust the pH value of the solution to 2.5-4, removing aluminum and titanium to obtain a primary impurity-removed solution, deeply removing aluminum and titanium from the impurity-removed solution by adopting ion exchange resin, and removing copper and filtering by adopting sulfide to obtain a copper-removed solution; supplementing iron is added into the copper removal liquid, the pH is adjusted to 3.5-6.5, ferrous phosphate reacts and is separated out, and ferrous phosphate is obtained; the method comprises the following steps: carrying out acid leaching on ferrous phosphate to obtain a leaching solution, adjusting the molar ratio of iron to phosphorus in the leaching solution, carrying out oxidation precipitation, adjusting the pH value of the solution again, aging, filtering, washing and drying to obtain iron phosphate dihydrate, and finally calcining to obtain the anhydrous iron phosphate. According to the method, a process route for producing iron phosphate by an ammonium method is used for reference, iron and phosphorus in the black powder of the lithium iron phosphate battery are recycled and converted into battery-grade iron phosphate in a ferrous phosphate form, impurities such as aluminum, titanium and copper are effectively removed, and the impurities are prevented from being entrained in the iron phosphate.

The invention discloses a step-by-step removal method for thallium and arsenic in lead-zinc smelting waste acid, which comprises the following steps: adding a calcium-containing precipitant into the lead-zinc smelting waste acid for neutralization and precipitation to obtain a neutralization and precipitation filtrate and a neutralization and precipitation filter residue; adding a calcium remover into the neutralized and precipitated filtrate to carry out calcium removal reaction to obtain calcium-removed filtrate and calcium-removed slag; adding an oxidizing agent I and a catalyst into the calcium-removed filtrate, controlling the pH value of the oxidation process to be 9.0-11.5 by using alkali liquor, carrying out selective oxidation thallium removal, and filtering to obtain thallium-removed filtrate and thallium-removed slag; and adding iron salt into the thallium-removed filtrate for deep arsenic removal to obtain effluent and arsenic-removed slag. According to the method, thallium and arsenic in the contaminated acid can be removed step by step, so that the concentration of arsenic and thallium in effluent stably reaches the standard for a long time while thallium slag and arsenic slag are separated.

The utility model discloses vertical sewage treatment equipment based on an MABR (Membrane Aerated Baffled Reactor) membrane. The vertical sewage treatment equipment comprises a water distribution system, an MABR reaction zone, an MABR membrane component, a gas supply and flushing system, a clear water zone, a backwashing automatic control system, a water production system and a liquid level control system. The sewage treatment system is short in process and simple to operate, compared with other sewage treatment systems, complicated processes and control of an anaerobic zone, an anoxic zone, an aerobic zone, a reflux system and the like are reduced, standard discharge of sewage is realized by only adopting one treatment process of the MABR, the aeration efficiency is 4-5 times of that of a conventional aerator by adopting an MABR bubble-free aeration technology, and the sewage treatment system has the advantages that the sewage treatment system is simple in structure and low in cost. The device is simple in structure and free of a nitrification liquid reflux pump, a sludge reflux pump and a stirrer, equipment investment and energy consumption are greatly reduced, the vertical tank body structural design is adopted, and compared with other integrated equipment, the occupied area is greatly saved.

The present invention provides a pre-phosphorus removal and post-endogenous denitrification coupled MBR sewage treatment system and process. The system mainly includes a pre-phosphorus removal unit, a post-endogenous denitrification unit and a sludge return unit. The effluent from the grit chamber enters a flocculation sedimentation phosphorus removal tank for phosphorus removal; then the supernatant enters a post-endogenous denitrification unit, and denitrifying bacteria absorb carbon sources in the anaerobic tank. In the dynamic aerobic tank, dynamic and precise nitrification is carried out in conjunction with detection instruments and control equipment, and then post-endogenous denitrification is carried out in the anoxic tank, thereby achieving deep denitrification; the effluent and sludge from the anoxic tank enter the MBR membrane tank and the sludge return unit, and a double return system is adopted to maximize the function of the anaerobic zone, or a pre-anaerobic zone is set up to divert the influent and reduce the impact of high dissolved oxygen in the MBR membrane tank on the denitrifying bacteria. The system and process solve the problems of low denitrification efficiency of traditional pre-denitrification, the sludge age contradiction between post-biological phosphorus removal and denitrification, high suspended solids in biochemical effluent, and the inability to selectively increase sludge concentration in winter.

The invention discloses a Fischer-Tropsch synthesis light oil self-reaction deep deoxidation method, which comprises the following steps of: introducing a Fischer-Tropsch synthesis light distillate oil raw material into a crude deoxidation reaction tower filled with a catalyst, and generating an oxygen-enriched heavy substance with a distillation range of more than 160 DEG C after a light oxygen-containing compound in the tower is subjected to self-reaction; and introducing a product of the crude deoxidation reaction tower into a heavy-throwing rectifying tower, carrying out heavy-cutting treatment, discharging oxygen-enriched heavy oil from the bottom of the tower, introducing light distillate oil at the top of the tower into a deep deoxidation adsorption tower filled with an adsorbent, and carrying out deep deoxidation to obtain Fischer-Tropsch synthesis light distillate oil of which the oxide concentration is less than 0.1 mu g / g from the bottom of the adsorption tower. According to the method, the three towers are connected in series, so that the deep removal of the oxides in the Fischer-Tropsch synthesis light distillate oil is realized with low energy consumption and low cost.

The invention discloses a method for preparing battery-grade iron phosphate from wet-process crude phosphoric acid and raffinate acid, which comprises the following steps of: mixing and leaching an iron source and wet-process crude phosphoric acid or wet-process crude phosphoric acid and raffinate acid to obtain ferrous dihydrogen phosphate containing metal impurities, ferrous phosphate leachate I and leaching residue; carrying out pH regulation and control on the leachate I to precipitate and remove aluminum in the form of aluminum phosphate, and carrying out multi-stage precipitation to remove aluminum until the content of aluminum ions is lower than 500ppm, so as to obtain leachate II; hydrofluoric acid is added into the leachate II, the pH value is adjusted to 1.6-2.5 with refined phosphoric acid, Al ions are precipitated, and leachate III is obtained after solid-liquid separation; an oxidizing agent is added into the leachate III for a precipitation reaction, and iron phosphate dihydrate and a phosphoric acid solution are obtained; and calcining the iron phosphate dihydrate to obtain the iron phosphate dihydrate. Crude phosphoric acid and raffinate acid can be directly utilized to produce battery-grade iron phosphate, the process is simple, compared with a traditional iron-method iron phosphate production process, the raw material cost is greatly reduced, generation of waste water and waste acid in the refining process is avoided, and the method is suitable for industrial production.

The invention discloses a use method for efficient waste plastic pyrolysis and dechlorination, which comprises the following steps: cleaning, blow-drying and crushing waste plastic, mixing with a catalyst, performing low-temperature pyrolysis in an oxygen-free environment, performing gas-liquid separation, cyclone dust removal and high-temperature dechlorination adsorbent treatment, and finally performing deep denitration and dechlorination by using a spray chamber. Wherein the temperature, the pressure, the heating rate and the heating time are strictly controlled in the pyrolysis process, and it is ensured that pyrolysis oil and gas are efficiently produced; in the dechlorination step, modified HZSM-5 zeolite and a spraying chamber technology are adopted, and chlorine and nitrogen oxides in pyrolysis gas are effectively removed through gas-liquid-solid three-phase contact, so that preparation of a high-purity product is realized. Experimental results show that the method can remarkably improve the dechlorination efficiency, the dechlorination rate reaches 96.18%, and an efficient and environment-friendly solution is provided for resource utilization of the waste plastics; according to the method, the economic benefit of waste plastic treatment is improved, and sustainable development of environmental protection and resource recycling is promoted.

The invention relates to the technical field of sewage treatment, in particular to a sulfur autotrophic denitrification biological filler and a preparation method thereof, a sulfur autotrophic denitrification fluidized bed, a sulfur autotrophic denitrification filter tank device and application. The sulfur autotrophic denitrification biological filler comprises a macromolecular base material, a sulfur autotrophic denitrification nutrition auxiliary material, a conductive functional auxiliary material and an electrophilic functional auxiliary material in a mass ratio of (90-100): (1-5): (0.5-3): (0.5-3); the macromolecular base material comprises at least one of polyethylene and polypropylene; the sulfur autotrophic denitrification nutrition auxiliary material comprises sulfur; the conductive functional auxiliary material comprises sludge-based biochar; the electrophilic functional auxiliary material comprises cationic starch. The sulfur autotrophic denitrification biological filler has the advantages of being high in mass transfer efficiency, capable of improving the electron transfer efficiency between microbial species, high in biocompatibility and the like.

The invention discloses an absorbent for fine desulfurization and decarburization of blast furnace gas, and relates to the technical field of desulfurization and decarburization of blast furnace gas. The phase-splitting agent comprises a phase-splitting agent, an alcohol amine chemical absorbent and water, the phase-splitting agent is sulfolane, and the alcohol amine chemical absorbent is diethanol amine; wherein the mass fraction of sulfolane accounts for 50-70%, the mass fraction of diethanol amine accounts for 15-25%, the balance is water, and the sum of the mass fraction percentages of the components is 100%. According to the invention, a two-phase absorbent is innovatively adopted, and the absorbent aims to overcome the limitation of a traditional absorbent and realize the function of fine desulfurization cooperating with carbon capture; the invention further relates to a blast furnace gas fine desulfurization and decarbonization combined device and a using method thereof.

An integrated sewage treatment device suitable for rural sewage belongs to the technical field of sewage treatment. The specific scheme is as follows: An integrated sewage treatment device suitable for rural sewage includes an inlet pipe, an anaerobic biochemical unit, an aerobic tank, a mud-water separation tank, a mud storage tank, a coagulation tank, a reaction tank, a sedimentation tank, a disinfection tank and an outlet pipe. Along the flow direction of the sewage, the inlet pipe, the anaerobic biochemical unit, the aerobic tank and the mud-water separation tank are connected in series in sequence, the lower mud area of ​​the mud-water separation tank is connected to the mud storage tank, the upper water area of ​​the mud-water separation tank is connected to the coagulation tank, the coagulation tank, the reaction tank, the sedimentation tank and the disinfection tank are connected in series in sequence, and the disinfection tank is connected to the outlet pipe. The sewage treated by the device described in the present invention can ensure that the effluent water quality meets the discharge standard of Class A of the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB 18918-2002).

The invention belongs to the technical field of synthesis of extraction agents, and particularly relates to a preparation method and application of amido diphosphinic acid. The preparation method comprises the following steps: (1) mixing a solvent, primary amine, cyclohexylphosphinic acid and inorganic acid, and heating until the solution is clear and transparent; (2) adding a formaldehyde solution or paraformaldehyde into the clear and transparent solution for reaction; and (3) removing a water phase from the mixture obtained after the reaction in the step (2) is finished, dissolving jelly obtained after the water phase is removed by using dichloromethane, and carrying out washing, rotary evaporation and drying to obtain the amido diphosphinic acid.

The application discloses a regenerated cationic cellulose-based composite filter membrane and a preparation method and nanometer plastic removal application thereof, and belongs to the technical field of regenerated cellulose water treatment filter materials. In the application, a sodium hydroxide-urea-thiourea ternary system is used to fully dissolve cellulose, the cellulose is modified by 2,3-epoxypropyl trimethylammonium chloride cation, a PVDF membrane is used as a base, and a hydrophilic composite filter membrane is prepared by vacuum filtration and loading of a cationized cellulose layer. The preparation process is mild, and the defects of the traditional cellulose membrane, such as insufficient dissolution, uneven pore size and poor screening precision, are solved. The filter membrane surface is positively charged, the hydrophilicity is greatly improved, the water contact angle is only 39°, the particle size of 50-500 nm carboxylated nanometer plastics can be efficiently intercepted, the removal efficiency of 100 nm polystyrene nanometer plastics reaches 97.01%, and the water flux is excellent. The process is green and low-cost, can remove polystyrene, polymethyl methacrylate and polyvinyl chloride nanometer plastics in a wide range, and has a good engineering application prospect in the field of deep treatment of water body nanometer plastic pollution.

The invention discloses a process method for selective deep desulfurization and denitrification of aromatic-rich fractions. The process method comprises the following steps: (1) mixing aromatic-rich diesel oil with hydrogen, and then feeding the mixture into a pre-hydrogenation reaction zone I for pre-hydrogenation dealkene reaction; (2) a product obtained in the step (1) enters a hydrofining reaction zone II for a hydrofining desulfurization and denitrification reaction; (3) carrying out flash evaporation on the product obtained in the step (2) to separate recycle hydrogen, enabling the obtained refined diesel oil to enter a moving bed adsorption denitrification reaction zone III, and carrying out deep adsorption denitrification reaction on the refined diesel oil under the action of an adsorption denitrification agent to obtain a desulfurized and denitrified refined aromatic-rich diesel oil component; and (4) enabling the inactivated adsorption denitrification agent in the step (3) to enter an adsorbent regeneration area IV, and completing reduction and drying of the inactivated adsorption denitrification agent under the action of a desorption agent to obtain the cyclically regenerated adsorption denitrification agent. According to the process method, deep removal of the sulfur-containing nitrogen-containing compound can be realized, and the investment cost is also greatly reduced.

This utility model belongs to the field of gypsum slurry technology, and particularly relates to a three-stage sedimentation and filtration device for gypsum slurry. It includes a support plate, a support frame above the support plate, a primary filter box above the support frame, an inlet above the primary filter box, a secondary filter tank connected to one side of the primary filter box via a first discharge pipe, a support base below the secondary filter tank, a tertiary filter box connected to one side of the secondary filter tank via a second discharge pipe, and a discharge pipe on one side of the tertiary filter box. The primary filter box contains a vibrating plate assembly for preliminary filtration of the slurry, and a spiral feeding assembly below the vibrating plate assembly. This utility model fundamentally solves the shortcomings of traditional processes in handling complex slurries, achieving deep removal of pollutants and efficient resource recovery while ensuring continuous operation, thus possessing significant economic and environmental benefits.

The present application relates to waste gas treatment technical field, specifically to a kind of acrylic resin waste gas treatment filter equipment, including main body, the main body inside is equipped with purification cavity, the main body circumferential outer wall is fixedly connected with shunt pipe, the shunt pipe bottom is equipped with several air pipes, the air pipe bottom end is penetrated to the inside of purification cavity;The inside of the purification cavity is provided with purification device, the purification device includes rotation installation in the center position of the inside bottom of purification cavity drive shaft, the inside of the purification cavity is located at the top position of drive shaft and is provided with limit frame, the center position of the limit frame bottom is penetrated and is equipped with docking interface.This application is through gas distribution plate, push plate and filter assembly linkage, to establish gas-liquid mixing neutralization system, improve the neutralization of acidic substances and the absorption efficiency of soluble VOCs, reduce the subsequent pollutant load, push plate, filter assembly and other collaborative impurities, clean filter screen, prevent secondary pollution, prolong the service life of filter material.

The invention relates to a method for one-step synthesis of high-quality stannous oxide through intermittent ultrasonic reinforcement, and belongs to the technical field of semiconductor material preparation. The preparation method comprises the following steps: dropwise adding a sodium hydroxide aqueous solution into a stannous chloride aqueous solution at room temperature under a stirring condition until the pH value is 12.5-13.5 to form a mixed solution system; applying intermittent ultrasonic waves to the mixed solution system for intermittent ultrasonic treatment to induce direct nucleation and growth of stannous oxide and synchronous removal of chlorine impurities, carrying out solid-liquid separation, and drying the solid to obtain the low-chlorine fine-particle-size stannous oxide. According to the method, through the work-stop periodic effect of intermittent ultrasound, dynamic conditions are provided for diffusion and desorption of chloride ions while nucleation and growth regulation are promoted through cavitation, cooperative regulation of particle size refinement and deep dechlorination of stannous oxide is achieved, a high-temperature step or repeated washing is not needed, the process is simple and efficient, the conditions are mild, and the method is suitable for industrial production. And controllable preparation of the high-performance stannous oxide material can be realized.

The application discloses a method for preparing arsenic-cadmium alloy by using arsenic-cadmium acid waste liquid, and belongs to the technical field of wastewater treatment. The application realizes the selective precipitation of arsenic and cadmium in the form of Cd5H2(AsO4)4.4H2O with high purity and complete crystal form by precisely controlling the molar ratio of cadmium to arsenic in the waste liquid to be 1.2-1.6 and adjusting the pH of the precipitation to be 4-6, thereby realizing the deep removal of the two toxic elements of arsenic and cadmium, and the removal rate of arsenic can reach more than 96.70%, and the process flow is greatly reduced. The Cd5H2(AsO4)4.4H2O-based precipitation slag is converted into high-purity arsenic-cadmium alloy by carbon thermal reduction, the amount of slag is greatly compressed, and the storage and landfill of waste materials are significantly reduced. The alloy can be further used to prepare downstream products such as semiconductor materials as a high-value-added product, realizes the high-value conversion from harmful waste to high-end raw materials, and has remarkable green disposal and resource utilization benefits.

The present invention discloses a dealkalizing refining agent and its preparation and application. The dealkalizing refining agent comprises a filler, a silane film and a modified layer from the inside to the outside, wherein the modified layer contains a sulfonic acid group and a secondary amine group. The preparation method of the dealkalizing refining agent comprises: preparing a filler covered with a silane film; and then treating the filler covered with the silane film with a modifier to obtain the dealkalizing refining agent. The method of the present invention can efficiently remove alkaline impurities that affect the activity of ethylbenzene alkylation catalyst, reduce the accumulation of alkaline impurities in the catalytic system, effectively extend the service life of the ethylbenzene alkylation catalyst, and reduce the production cost of ethylbenzene, and can be used in the industrial production of dry gas to ethylbenzene devices.

The invention relates to the technical field of water treatment, and discloses an organic wastewater treatment system and method. The organic wastewater treatment system comprises a first anaerobic unit, a deamination unit and a second anaerobic unit which are connected in sequence, the first anaerobic unit comprises an anaerobic reactor, and the number of stages of the anaerobic reactor is 1 + N (N is an integer greater than or equal to 0); the second anaerobic unit comprises an anaerobic reactor, and the number of stages of the anaerobic reactor is 1 + M (M is an integer greater than or equal to 0). According to the organic wastewater treatment system provided by the invention, the deamination unit is additionally arranged between the anaerobic units, and the deamination unit can effectively remove free ammonia generated by primary anaerobic treatment, so that the influence of anaerobic treatment intermediate metabolites on methanation reaction is reduced, the methanation reaction in subsequent anaerobic treatment is ensured, and the yield of the organic wastewater is improved. The treatment effect of anaerobic treatment on organic wastewater is improved.

The utility model relates to a kind of electric field activation pyrite removal wastewater total nitrogen device, belong to sewage treatment technical field, the utility model includes water distribution tank, reaction tank and effluent tank;Anode cage, cathode tube are equipped in the reaction tank, and sulphur iron ore particles are filled between cathode tube and anode cage;The power supply is connected to the cathode tube and anode cage;Water distribution tank and reaction tank between being equipped with baffle A, and the bottom of baffle A remains water flow passage A;Reaction tank and effluent tank between being equipped with baffle B;Water flow passage B is left in the left side of baffle B;The structure of the utility model makes sewage contact with sulphur iron ore under the action of electric field, and nitrate nitrogen and nitrite nitrogen can be reduced to nitrogen without biological bacteria, and nitrogen removal rate is high.

The invention discloses a preparation process of air entrapment prevention low-bubble moisture curing reaction type polyurethane honeycomb glue, and relates to the technical field of chemical synthesis processes. The process comprises the following steps: firstly, introducing sacrificial isocyanate, and converting deep bound water in polyhydric alcohol into gas and deeply removing the gas in cooperation with pulse type nitrogen gas stripping and reverse vacuum linkage; and then carrying out high-temperature solubilization hysteresis treatment to forcibly dissolve by-product particles so as to eliminate bubble nucleation centers. In the polymerization stage, a reaction type low-surface-energy modifier is adopted for in-situ end capping, and the surface tension of the melt is reduced; a negative pressure gradient cooling procedure is executed in the discharging stage, the vacuum degree is gradually increased along with cooling, and the gas under-saturation state of the glue solution is locked. According to the invention, the hidden danger of endogenous bubbles is effectively eliminated, the finished product glue solution is endowed with the capabilities of inhibiting mechanical gas entrapment and actively absorbing interface bubbles during roll coating, and the flatness and bonding quality of the composite honeycomb plate are remarkably improved.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

The invention belongs to the technical field of nickel-based high-temperature alloy smelting, and relates to a method for preparing a low-aluminum-content GH3535 master alloy through vacuum induction smelting. The preparation method comprises the following steps: preparing a vacuum induction furnace from high-purity fused magnesium oxide; adding metal raw materials corresponding to Ni, Fe, Mo, Cu and Co into the vacuum induction furnace for melting down; then adding a raw material C, smelting and carrying out electromagnetic stirring to obtain a first melt; a Cr raw material is added into the first melt, argon and an oxidizing agent are sequentially added after melting down, then smelting and electromagnetic stirring are conducted, and a second melt is obtained; adding the raw material C into the second melt again, and performing smelting and electromagnetic stirring to obtain a third melt; adding raw materials corresponding to C, Si, Mn and Ti into the third melt, and performing smelting and electromagnetic stirring to obtain a fourth melt; and after gas in the fourth melt is completely separated out, vacuum pouring is conducted, and finally the GH3535 master alloy with the low aluminum content can be obtained.

The invention discloses a smelting multi-pollutant wastewater treatment process, wherein the smelting wastewater is subjected to a process combination of sulfidation treatment, gypsum process, weight removal treatment, and defluorination treatment, wherein a sulfiding agent is added in the sulfidation treatment, lime is added in the gypsum process, lime, thallium removal agent, and defluorination and heavy metal removal multi-nuclear agent are added in the weight removal treatment, and defluorination and heavy metal removal multi-nuclear agent is added in the defluorination treatment, and a denitrification agent is added in two steps in the process, so as to achieve the simultaneous removal of heavy metals and non-metallic oxides in the smelting multi-pollutant wastewater. The smelting multi-pollutant wastewater treatment process is simple, has a good effect of simultaneous removal of multiple pollutants, and has considerable comprehensive benefits.

The invention discloses a method for removing arsenic from arsenic-containing industrial gypsum and simultaneously preparing alpha calcium sulfate hemihydrate. The method specifically comprises the following steps: drying, crushing and sieving the arsenic-containing industrial gypsum; the method comprises the following steps: mixing arsenic-containing industrial gypsum powder with a sulfuric acid solution with the mass concentration of 5-7% to obtain gypsum suspension slurry, adding the gypsum suspension slurry into a reaction kettle, carrying out stirring reaction at 110-150 DEG C for 60-180 minutes, cooling to 100 DEG C, carrying out suction filtration on the slurry while the slurry is hot, sequentially washing with boiling water and absolute ethyl alcohol for 2-4 times respectively, and drying to obtain the alpha calcium sulfate hemihydrate. According to the method, deep removal of arsenic in the arsenic gypsum can be realized, and the removal rate of arsenic is gt; according to the method disclosed by the invention, the product obtained under the condition that no crystal modifier is added has a relatively good crystal form and a relatively small length-diameter ratio, and the method disclosed by the invention realizes arsenic removal of the arsenic-containing industrial gypsum and preparation of a gypsum product with a high additional value.

This invention belongs to the field of livestock and poultry breeding wastewater treatment and agricultural reuse technology, specifically relating to an electrochemically enhanced low-pressure ultrafiltration system and method for reusing livestock and poultry breeding wastewater. The electrochemically enhanced low-pressure ultrafiltration system includes an inlet tank, a constant-level water tank, a gravity-driven low-pressure ultrafiltration membrane module, a water collection device, and a constant-pressure driving power supply. The gravity-driven low-pressure ultrafiltration membrane module includes a reactor, and an anode, an ultrafiltration membrane, and a cathode pre-filtration layer installed within the reactor. The cathode pre-filtration layer consists of a biofilter cake layer and a cathode. This invention, an electrochemically enhanced low-pressure ultrafiltration system and method for reusing livestock and poultry breeding wastewater, addresses the characteristics of livestock and poultry breeding wastewater by employing an externally sourced constant voltage-driven electrochemically enhanced gravity-driven low-pressure ultrafiltration system. It can simultaneously achieve heavy metal reduction, antibiotic degradation, pathogen interception, inhibition of resistance gene transmission, and membrane fouling control under low-energy consumption conditions, while retaining nitrogen and phosphorus resources in the wastewater, ensuring safe reuse for agricultural irrigation.

The invention provides an N-nitrosodimethylamine (NDMA) control technology in a ranitidine hydrochloride injection production process. The N-nitrosodimethylamine control technology comprises the following steps: step 1; accurately weighing the ranitidine hydrochloride raw material and the activated carbon which are calculated according to the preparation amount; step 2; the preparation method comprises the following steps: adding the raw materials into water for injection which is about 2 / 3 of the total amount, controlling the temperature of the liquid medicine to be 15-20 DEG C in the whole process, stirring to dissolve, adding the water for injection into the solution until the total amount is reached, uniformly stirring, and regulating the pH value to be 6.8-7.5 by using anhydrous disodium hydrogen phosphate; step 3; stirring the raw materials to fully mix the activated carbon with the raw materials; step 4; the raw materials are filtered, and visible foreign matter and bacteria in the raw materials are filtered out; step 5; and treating the ampoule, and filling the treated liquid medicine into the ampoule. In the dissolving and liquid preparation stage, a specific dissolving process is researched and developed, water for injection is quantitatively added for multiple times, and the temperature and the pH value are strictly controlled in a specific range, so that the formation of NDMA is effectively avoided, the solubility and the stability of the medicine are improved, and the risk of adverse reaction is also remarkably reduced.

The invention discloses a method for removing metal pollutants by advanced oxidation enhanced filtration, which comprises the following steps: mixing raw water to be treated containing manganese pollutants with peroxymonosulfate, carrying out ultraviolet radiation, and carrying out oxidation reaction to obtain an oxidized water body; the oxidized water body is filtered through quartz sand, manganese pollutants are removed through reaction, and the purified water body is obtained. By adopting a method of coupling peroxymonosulfate, ultraviolet radiation and quartz sand filtration, the originally mild peroxymonosulfate can be converted into a relatively active oxidation system, the efficient oxidation of the manganese pollutants is realized, the required treatment time is short, and the treatment cost is low. The deep removal of manganese pollutants in low-concentration raw water can be realized under the conditions that a complexing agent is not added, an expensive special adsorbent is not used and a complex filter material is not used.

The invention relates to a method for cooperatively treating fluorine-containing waste acid by using copper smelting tailings and calcium hydroxide, and belongs to the technical field of waste acid treatment.The method comprises the steps that smelting slag generated through smelting and blowing procedures in the copper smelting process is taken and subjected to slow cooling, crushing, copper flotation and iron magnetic separation process treatment, and then tailings are obtained; the tailings and water are put into a stirring bin and stirred for 1-3 h at the temperature of 45-50 DEG C and the speed of 60-100 r / min, and slurry is obtained and stored at the constant temperature of 42 DEG C for use; putting the slurry and the waste acid into a stirring bin, stirring for 10-20 minutes at the speed of 10-30 r / min, and stirring for 10-20 minutes at the speed of 10-30 r / min after 30 minutes; and adding calcium hydroxide and detonation oxygen into the prefabricated material, neutralizing until the pH value is 8-8.5, stirring for 1-3 hours at 120-150r / min, and carrying out solid-liquid separation to obtain reuse water with the arsenic content less than or equal to 0.5 mg / L and the fluorine content less than or equal to 5mg / L. According to the method, the industrial waste copper smelting tailings are fully utilized and converted into the fluorine-containing waste acid treating agent, arsenic and fluorine in waste acid can be efficiently removed, and deep removal of arsenic and fluorine in waste acid can be achieved by optimizing the treatment process and parameters.

The application discloses a carbon nanotube acid bubble purification process and relates to the technical field of carbon nanotube purification. The process comprises the following steps: step S1, raw material pretreatment; step S2, multistage acid bubble purification; step S3, intensified water washing; step S4, drying treatment; and step S5, post-treatment. The complete process chain of raw material pretreatment, multistage acid bubble purification, intensified water washing, drying treatment and post-treatment is arranged, wherein the raw material pretreatment adopts a vacuum suction pump for feeding and combines with a bag dust collector for collecting dust, the multistage acid bubble purification is sequentially performed for primary, secondary and tertiary purification, and reaction conditions are accurately controlled, the intensified water washing starts to use an ultrasonic device to assist pressure filtration water washing, the drying treatment combines with a cyclone separator and a bag dust collector, and the post-treatment comprises screening, multistage magnetic removal and nitrogen filling packaging. Therefore, the problems of large product purity fluctuation and incomplete impurity removal caused by the incoherent process and rough parameter control in each link of the existing process can be solved.