833 results about "Dyeing wastewater" patented technology

The invention particularly relates to printing and dyeing wastewater advanced treatment equipment and a method thereof. The equipment comprises a pretreatment unit, an electrolysis unit, a pH regulation unit, a post-treatment unit and a comprehensive monitoring unit, the pretreatment unit comprises a physical filtering device and an advanced oxidation pretreatment device and is used for removing suspended solids and macromolecular organic matters; the electrolysis unit is provided with a current control module and a salinity adjusting module and is used for degrading organic pollutants and disinfecting and sterilizing; the pH adjusting unit is provided with a pH sensor and a pH correction pump and is used for accurately controlling the pH value change in the treatment process; the post-treatment unit comprises an ultrafiltration membrane and activated carbon and is used for removing residual micromolecular organic matters and trace heavy metal ions; the comprehensive monitoring unit integrates a PLC controller, a data acquisition module and a communication interface, and is used for realizing automatic management and remote monitoring of the system.

The invention relates to the technical field of wastewater recovery, in particular to a recovery device and process for reactive dye dyeing wastewater, and the recovery device comprises a tank body which is internally provided with a filter plate and a cleaning assembly, and the cleaning assembly comprises a cleaning plate; the collecting assembly comprises a collecting box mounted above the cleaning plate; the flushing assembly comprises a plurality of groups of connecting rods, and nozzles are mounted on the plurality of groups of connecting rods; the device has the beneficial effects that reactive dye dyeing wastewater is filtered through the filter plate, when the motor drives the cleaning plate to rotate, the elastically arranged scraping plate can scrape residues attached to the surface of the filter plate, the residues are prevented from blocking filter holes in the filter plate, and when the cleaning plate rotates, the residues scraped by the scraping plate are accumulated in the collecting frame, so that the cleaning effect is good. And under the flowing of the water flow, the water flows into the collecting box through the through groove, so that the residues are collected.

The invention provides a method and system for salt separation, evaporation and crystallization of printing and dyeing wastewater, and the method comprises the following steps: sequentially carrying out multi-stage synergistic pretreatment on textile printing and dyeing wastewater to remove suspended solids, degrade organic matters and reduce hardness; the pretreated wastewater is subjected to membrane salt separation treatment, and preliminary separation of salt is achieved through reverse osmosis pre-concentration and nanofiltration salt separation; and respectively carrying out evaporative crystallization treatment on the separated high-concentration salt solution to obtain high-purity sodium sulfate and sodium chloride products. According to the method, the salt recovery rate and the product purity are remarkably improved, the energy consumption and the operation cost are reduced, meanwhile, the problems that in traditional printing and dyeing wastewater treatment, salt is difficult to separate, and the crystallization purity is low are solved, and an innovative solution is provided for high-valued resource recovery of industrial wastewater.

The invention relates to the technical field of adsorbent preparation, in particular to an ammonia modified porous carbon adsorbent and a preparation method thereof. The preparation method of the ammonia modified porous carbon adsorbent comprises the following steps: carrying out hydrothermal acid leaching on gasified fine residues and an acid solution to obtain acid leaching residues; stirring the acid leaching residues in an alkali solution, washing and drying to obtain a porous carbon material; and dipping the porous carbon material in a tetraethylenepentamine solution, and then drying to obtain the ammonia modified porous carbon adsorbent. The ammonia modified porous carbon adsorbent is successfully constructed by taking a porous carbon material derived from coal gasification fine slag as a substrate and further adopting a surface ammonia functionalization modification strategy. The preparation method is simple, the raw materials are easy to obtain, and the prepared ammonia modified porous carbon adsorbent has a good adsorption effect on methylene blue and hexavalent chromium. According to the method, high-added-value resource utilization of the coal gasification solid waste is achieved, and a solution is provided for treatment of the dye wastewater and the heavy metal wastewater.

The invention provides an environment-friendly fabric printing and dyeing wastewater treatment system and method, and belongs to the technical field of wastewater treatment. An environment-friendly fabric printing and dyeing wastewater treatment system at least comprises a water storage tank, two flocculation tanks, two sedimentation tanks, a transition tank, an oxidation tank, a secondary sedimentation tank, a BAF tank, a disinfection tank and a discharge tank which are connected in sequence, the two flocculation tanks are connected to the water storage tank at the same time, the two sedimentation tanks are connected to the two flocculation tanks in a one-to-one correspondence mode, and the two sedimentation tanks are connected to the BAF tank in a one-to-one correspondence mode. The two sedimentation tanks are connected to the transition tank at the same time; adding a flocculating agent and magnetic powder into the flocculation basin at the same time; each sedimentation tank is internally provided with a treatment mechanism for accelerating sedimentation of magnetic flocs and rapidly removing suspensions, each sedimentation tank is internally provided with a water outlet assembly capable of being adjusted in height, and the water storage area of the transition tank is lower than the water outlet assembly. The sewage treatment device has the advantage of improving the sewage treatment efficiency.

The invention discloses a composite polyacrylamide flocculant based on a nano core-shell structure as well as a preparation method and application of the composite polyacrylamide flocculant. The composite polyacrylamide flocculant is a core-shell structure composite material which takes inorganic nanoparticles grafted with carbon-carbon double bonds on the surface as a core and takes a polyacrylamide copolymer as a shell; the polyacrylamide copolymer is prepared from the following components in parts by mass: 70 to 90 parts of acrylamide, 10 to 30 parts of functional monomer and 0.1 to 1.0 part of cross-linking agent. The basic conception of the flocculating agent provided by the invention is that the structural design of inorganic nano core-organic polymer shell is adopted, PAM molecular chains firmly grow on the surfaces of nano particles in a chemical grafting manner, high dispersion and functional synergy of nano units are realized, and the obtained product has the characteristics of high flocculation speed, dense floc, high removal efficiency and the like, and has a wide application prospect. The method is especially suitable for deep treatment of difficult-to-treat industrial wastewater such as oil-containing wastewater, dye wastewater and heavy metal wastewater.

The invention discloses a printing and dyeing wastewater advanced treatment and salt control recycling process and system, and belongs to the technical field of wastewater treatment. According to the process, the printing and dyeing wastewater is sequentially subjected to pretreatment of grating interception, adjustment and homogenization, and coagulating sedimentation; carrying out hydrolytic acidification and biochemical treatment in a membrane bioreactor; softening treatment of ozone oxidation complex breaking and fluidization crystallization softening; carrying out nanofiltration separation to obtain a permeate and a concentrated solution; carrying out seed crystal fluidization descaling on the concentrated solution; respectively carrying out membrane concentration on the nanofiltration permeate and the descaled concentrated solution through reverse osmosis to obtain sodium chloride and sodium sulfate concentrated solutions; and finally, carrying out evaporation curing treatment on the sludge and the crystallized waste residues. Through multi-step cooperative treatment, deep purification of the printing and dyeing wastewater and efficient separation and recycling of salt are realized, and the problems of impure nanofiltration salt separation and high system scaling risk in the prior art are solved.

The invention provides an aerogel-based porous composite material for sewage treatment and a preparation method and application thereof.The preparation method comprises the steps that a nanocellulose solution and a cobalt source solution are mixed to obtain a precursor solution, and under the stirring and heating conditions, an organic ligand solution is dropwise added into the precursor solution to obtain a reaction solution; uniformly mixing the reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and performing directional freezing to obtain an aerogel matrix; and carrying out hydrophobic modification on the aerogel matrix. Through the synergistic effect of the nanocellulose skeleton and the ZIF-67 crystal, and in combination with a hierarchical porous structure constructed by directional freezing, efficient synergism of physical adsorption and chemical catalysis is realized, so that the material shows an excellent removal effect on dyes, hydrocarbon pollutants and heavy metal ions in complex water bodies such as printing and dyeing wastewater and petrochemical wastewater in a wide pH range (pH = 3-11).

The invention discloses a nanocellulose composite aerogel, a preparation method thereof and application of the nanocellulose composite aerogel in wastewater dye adsorption, and belongs to the technical field of water treatment. The preparation method comprises the following steps: blending nano cellulose, a cross-linked polymer and a nano reinforcing material under the assistance of ultrasonic waves to form stably dispersed composite sol; injecting the composite sol into a mold, carrying out pre-freezing, and then carrying out vacuum freeze drying; and immersing the aerogel obtained after freeze drying into a cross-linking agent solution for post-crosslinking treatment, and drying to obtain the nano-cellulose composite aerogel. The nano-cellulose composite aerogel provided by the invention has the beneficial effects that efficient adsorption of cationic dyes and anionic dyes is realized at the same time, and the nano-cellulose composite aerogel is suitable for advanced treatment of printing and dyeing wastewater.

The invention provides a photo-thermal evaporation material based on black titanium dioxide as well as a preparation method and application of the photo-thermal evaporation material. The preparation method comprises the following steps: mixing urea, absolute ethyl alcohol and tetrabutyl titanate into a solution A, mixing absolute ethyl alcohol, ultrapure water and hydrochloric acid into a solution B, dropwise adding the solution B into the solution A, mixing to form a white colloid, heating in a water bath, drying, and calcining in a nitrogen atmosphere to obtain black titanium dioxide powder; the preparation method comprises the following steps: fully mixing a certain amount of black titanium dioxide, sodium alginate and ultrapure water to form a uniform dispersion liquid, dipping the pretreated polyurethane sponge in the dispersion liquid, and crosslinking with a calcium chloride solution to prepare the photo-thermal evaporation material of the black titanium dioxide-calcium alginate composite hydrogel. The photo-thermal evaporation material breaks through the photo-thermal application bottleneck of traditional titanium dioxide, has excellent evaporation rate and seawater desalination performance, and can effectively remove various printing and dyeing wastewater to obtain clean water.

The invention discloses a printing and dyeing wastewater zero-discharge treatment process based on low-pressure high-power membrane concentration and salt separation synergy. The wastewater is sequentially subjected to the steps of double-alkali softening pretreatment, organic pollutant treatment, forward osmosis low-pressure high-power concentration treatment, salt separation treatment and evaporative crystallization. Wherein the forward osmosis low-pressure high-power concentration treatment is performed in a partitioned manner along the flow direction, the osmotic pressure difference is gradually increased, the transmembrane pressure difference is gradually decreased, and interface electrochemical buffer and low-frequency gas-liquid disturbance can be set to inhibit concentration polarization and pollution. Carrying out nanofiltration and salt separation on the concentrated solution to obtain two paths of saline water mainly comprising Na2SO4 and NaCl, and respectively carrying out evaporative crystallization on the two paths of saline water; and refluxing and reusing the water produced by the draw solution. According to the process, high-power concentration and stable salt separation are realized under low mechanical pressure, the energy consumption is reduced, the water recovery rate and the crystal purity are improved, and zero discharge of wastewater is realized.

The invention discloses a wool fiber dyeing method based on an electrostatic spraying technology, and belongs to the field of spinning. The method comprises the following steps: firstly, preparing electrostatic dye liquor containing acid dye; then, the wool fabric is subjected to wetting pretreatment with water; fixing the pretreated wool fabric on a collecting device, and uniformly spraying the dye liquor onto the wool fabric through an electrostatic spraying technology; and finally, carrying out color fixation treatment through open-width steaming to obtain the wool fiber material dyed by the acid dye. The dyeing method greatly reduces the use of water resources and dyeing assistants, greatly reduces the generation of printing and dyeing wastewater, is a green and environment-friendly wool fiber dyeing technology, and has huge application potential in the textile printing and dyeing industry.

The invention discloses peroxidase and application thereof, and relates to the field of bioengineering. The peroxidase POD-8 provided by the invention has very good enzyme activity for oxidizing phenol substrates, especially has the highest enzyme activity for 2, 6-DMP, has very good persistence, and can keep stable enzyme activity within 10 minutes; the resistance to various metal ions is relatively high, and the enzyme activity of 90% or above can still be kept in the presence of various metal ions with various concentrations; the POD-8 has a strong decolorizing capability on a plurality of dyes, especially has a decolorizing efficiency of about 25% on Congo red and amino black 10B in 24 h, and has a good application prospect in the aspect of dye wastewater treatment.

The invention discloses a method for treating printing and dyeing wastewater based on an aerobic granular sludge technology, which comprises the following steps: culturing and domesticating aerobic granular sludge: adopting a sequencing batch activated sludge reactor with a large height-diameter ratio, adding high-load simulated printing and dyeing wastewater into the reactor, and starting to culture the aerobic granular sludge; treating the printing and dyeing wastewater by using the aerobic granular sludge: treating the printing and dyeing wastewater by using the cultured and domesticated aerobic granular sludge; carrying out biological aerated filter pretreatment: carrying out starting and biofilm formation by adopting simulated wastewater; advanced treatment with a double-membrane process: treating the effluent with the double-membrane process, wherein ultrafiltration adopts a high-strength hollow fiber membrane module, and the operation mode is an external pressure mode; an anti-pollution membrane assembly with pollution resistance, high desalination rate and high water yield is adopted for reverse osmosis, and by adjusting operation parameters of a double-membrane process, the effluent quality meets the water quality requirement of recycled water in the textile dyeing and finishing industry.

The invention discloses a supported ozone catalyst for printing and dyeing wastewater treatment and a treatment process, and relates to the technical field of wastewater treatment, the supported ozone catalyst comprises an environmental response type porous medium, an active center and a biological enzyme modification layer; the environment-responsive porous medium is based on poly (N-isopropylacrylamide) grafted and modified mesoporous alumina, the initial aperture of the mesoporous alumina is 10-15nm, the grafting rate of poly (N-isopropylacrylamide) is 12-20%, and an active center is composed of a transition metal active center and quantum dots modified on the transition metal active center. The biological enzyme modified layer is obtained by carrying out deep biological modification on the surface of the catalyst by using laccase with oxidation-reduction activity. According to the invention, an environment-responsive porous medium is constructed by grafting mesoporous alumina with poly (N-isopropylacrylamide), so that the problems that a traditional fixed-aperture catalyst is low in mass transfer efficiency and poor in adaptability to working conditions, and the pollutant release efficiency is difficult to effectively improve under different temperature and pH conditions are solved.

The invention relates to the field of water purifying agents, and discloses a polyaluminum chloride water purifying agent for printing and dyeing wastewater and a preparation method thereof.The polyaluminum chloride water purifying agent for printing and dyeing wastewater is prepared from polyaluminum chloride, an adsorption additive, magnetic composite filler and the balance deionized water; the adsorption additive is prepared by ultrasonically compounding a modified ZIF-8 coated iron material and modified nano titanium dioxide; the modified ZIF-8 coated iron material is prepared by coating nano zero-valent iron with ZIF-8 and carrying out high-temperature carbonization. The modified nano titanium dioxide is prepared by doping and modifying cerium; the magnetic composite filler is prepared by the following steps: pretreating sepiolite by using hydrochloric acid, then coating the surface of the pretreated sepiolite with chitosan by adopting a coprecipitation method, and loading ferroferric oxide particles into the chitosan. Therefore, the usage amount of polyaluminum chloride is reduced, and the water purifying agent is endowed with excellent photocatalytic activity and adsorption effect in printing and dyeing wastewater.

The invention belongs to the technical field of wastewater treatment equipment, and particularly relates to a cloth dyeing wastewater treatment device which comprises a supporting frame, the top end of the supporting frame is obliquely and fixedly connected with a filtering box, the inner wall of the filtering box is fixedly connected with a coarse filtering cylinder, and the side wall of the coarse filtering cylinder is provided with a discharging hole matched with the outlet end of the coarse filtering cylinder. The cloth dyeing wastewater treatment equipment not only has the function of continuously filtering out large impurities in wastewater, but also has the functions of wastewater concentration improvement, wastewater flocculation and acid-base neutralization treatment, the wastewater treatment process has the function of dynamic adjustment, and in addition, due to the fact that dilution of a large amount of filtrate is avoided, the wastewater treatment efficiency is improved. The device can greatly reduce the usage amount of an acid-base neutralizing agent and a flocculating agent, does not need to be matched with a treatment pond, effectively reduces the occupied area of the device, enables wastewater to be continuously injected in the wastewater treatment process, further improves the wastewater treatment continuity and efficiency of the device, and meets the requirements of the printing and dyeing industry for efficiently and economically treating cloth dyeing wastewater.

The present invention relates to the technical field of wastewater treatment equipment, and discloses a textile fabric printing and dyeing wastewater treatment equipment and its treatment method, including a sedimentation tank. A bracket is fixedly connected to the top of the sedimentation tank. A drain pipe is communicated with one side of the sedimentation tank. A motor is fixedly connected to the top of the bracket. It also includes a wastewater treatment mechanism. When the motor is started, the motor drives the rotating shaft to rotate. The rotating shaft drives the reciprocating lead screw to rotate. Limited by the limiting rod, the reciprocating lead screw drives the threaded housing to vertically descend along the outer wall of the reciprocating lead screw. During the descent of the threaded housing, the water inside the sedimentation tank is filtered, so that the water inside the sedimentation tank enters the inside of the threaded housing through the round holes. Due to the arrangement of the activated carbon plate, the water entering the inside of the threaded housing enters the upper end inside the threaded housing through the activated carbon plate. The filtered water inside the threaded housing enters the upper end inside the sedimentation tank through the filter screen, and the preliminarily treated wastewater is obtained.

The invention relates to the technical field of wastewater detection, and discloses a printing and dyeing wastewater detection device and a detection method thereof.The printing and dyeing wastewater detection device comprises a transfer box, a liquid storage tank is fixedly connected to the bottom of the inner wall of the transfer box, a motor is fixedly connected to the top of the transfer box, and a stirring rod is arranged on the inner wall of the liquid storage tank; wastewater is discharged into a liquid storage tank through a water inlet pipe, the wastewater flows downwards along the outer wall of the liquid storage tank along with increase of the wastewater in the liquid storage tank, at the moment, a motor is started to drive a stirring rod to rotate, fluff in the wastewater flows from the outer wall of the liquid storage tank, a connecting frame is driven to rotate, a connecting frame is driven to rotate, and a roller brush rotates around the center of the liquid storage tank; the outer surface of the roller brush is influenced by the friction force between the roller brush and the outer wall of the liquid storage tank, so that the roller brush rotates to adhere fluff in the sewage, and the situation that the detection of the chromaticity in the sewage is influenced due to the fact that more fluff exists in the sewage and the sewage is too turbid is effectively prevented, so that the chromaticity detection accuracy of the chromaticity analyzer is ensured.

The invention discloses an advanced treatment agent for textile printing and dyeing wastewater and a treatment method. The advanced treatment agent comprises a component A and a component B, the component A comprises modified graphene oxide and an enzyme treatment agent; the component B comprises magnesium aluminum silicate, hydroxyapatite, hydroxypropyl methyl cellulose and chitosan, and the hydroxyapatite is coated with the magnesium aluminum silicate to form a core-shell structure. By adopting a modified graphene oxide immobilized enzyme structure, harmful components in water can be effectively adsorbed, so that the effect of greatly improving sewage purification is achieved, and meanwhile, the adsorption effect of the harmful components can be further improved by matching with aluminum-magnesium silicate coated hydroxyapatite, hydroxypropyl methyl cellulose and chitosan; meanwhile, bonding with the modified graphene oxide is beneficial to agglomeration and flocculation of substances, so that the flocculation capacity is improved, and floc separation is facilitated.

The invention belongs to the technical field of textile dyeing, and provides a salt-free alkali-free electrostatic spray dyeing method for cellulosic fibers, which comprises the following steps: uniformly mixing polyethylene oxide, reactive dye and solvent to obtain electrostatic dye liquor; the method comprises the following steps: dissolving a cationic modifier and an alkaline color fixing agent in water to prepare a cationic modified solution, padding a cellulose fiber fabric, and drying to obtain a cationic modified cellulose fiber fabric; and spraying the electrostatic dyeing liquid to the surface of the cationic modified cellulose fiber fabric through electrostatic spraying, and carrying out open-width steaming color fixation and cleaning to obtain the electrostatic spraying dyed cellulose fiber fabric. The electrostatic spraying technology is adopted to replace traditional water bath dyeing, excellent K / S value, dye uptake and color fastness can be achieved without consuming a large amount of salt, alkali and water, water resource consumption and environmental pollution are remarkably reduced, and high-salinity and high-chroma printing and dyeing wastewater is avoided.

The invention discloses a high-performance malachite green adsorbent as well as a preparation method and application thereof, and belongs to the technical field of preparation of malachite green adsorbents. The method comprises the following steps: with a carbon-based adsorbent as a raw material and an ethanol aqueous solution and a sodium hydroxide solution as modifiers, heating and stirring on a magnetic stirrer to form a turbid liquid; and further carrying out solid-liquid separation on the turbid liquid, washing a solid product with deionized water until the solid product is neutral, and drying. The prepared high-performance malachite green adsorbent is used for treating malachite green printing and dyeing wastewater, and compared with a carbon-based adsorbent raw material, the adsorption performance is effectively improved. The preparation method of the high-performance malachite green adsorbent is simple, rapid, low in energy consumption and good in environmental protection property.

The invention discloses a preparation method of an iron-manganese bimetallic catalytic material by using copper slag. The preparation method comprises two steps of pretreating the copper slag and preparing the iron-manganese bimetallic catalytic material. The iron-manganese bimetallic catalytic material prepared by the method belongs to a porous material, is rich in pores and large in specific surface area, is rich in Fe < 3 + >, Mn < 3 + >, Mn < 4 + > and other active sites on the surface, has the advantages of high catalytic activity, good stability and environmental friendliness, and realizes reduction and high-value utilization of the copper slag. In addition, the prepared iron-manganese bimetallic catalytic material can be used for catalyzing persulfate to form an advanced oxidation system, and is suitable for degradation treatment of organic wastewater such as printing and dyeing wastewater, pharmaceutical wastewater, food wastewater and raffinate.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention provides an integrated treatment device and method for efficient decoloration and COD synchronous degradation of printing and dyeing wastewater, and relates to the field of wastewater treatment.The integrated treatment device comprises a treatment tank, a filter box is installed on the side wall of the treatment tank, a water pump pipe set is fixedly installed at the top of the filter box, and the water pump pipe set is used for pumping water in the treatment tank and conveying the water into the filter box; the device further comprises a mixing mechanism, a driving mechanism, a filtering adsorption assembly and a medicine injection part which are installed at the top of the treatment tank and used for injecting medicine into the treatment tank. A driving motor works to drive a stirring shaft through a belt, so that wastewater and a decolorizing agent are stirred and mixed through the stirring shaft and stirring blades, it is guaranteed that the wastewater and the decolorizing agent are effectively mixed to achieve the decolorizing purpose, meanwhile, when a telescopic pipe is pushed by a staggered protrusion, the telescopic pipe will compress a third spring, and the third spring is pushed to rotate. When the telescopic pipe is aligned with the medicine outlet hole in the hollow sleeve, the COD degradation agent in the medicine storage tank can be conveyed into the treatment tank through the medicine pump.

The invention relates to the technical field of waste silk recycling, in particular to a textile printing and dyeing wastewater treatment device and method.The textile printing and dyeing wastewater treatment device comprises a treatment pond, a partition plate is fixedly installed in the treatment pond to divide the interior of the treatment pond into a filtering pond and a settling pond, and a waste silk filtering assembly is rotatably installed in the filtering pond; a material guide assembly is rotationally mounted on the bottom surface in the filter tank; a mixing tank is arranged on the outer side, close to the filter tank, of the treatment tank. Through the synergistic effect of the waste silk filtering assembly and the material guiding assembly, solid waste silk in waste water can be efficiently separated and automatically recycled, the rotary type filtering plates automatically switch the working state in the continuous filtering process, after one filtering plate completes filtering operation, the filtering plate can be driven by a servo motor to rotate to the vertical position, and the waste silk in the waste water can be automatically recycled. At the moment, a winding needle in the waste silk recycling assembly moves back and forth along the surface of the filter plate to recycle waste silk left on the surface of the filter plate, the problem that a traditional fixed filter screen is prone to being blocked is solved, and automatic recycling of the waste silk can be achieved.

The invention provides a printing and dyeing wastewater concentration method and system, and the method comprises the steps: carrying out pretreatment on desizing wastewater, so that suspended particles and colloidal impurities in the wastewater are intercepted and adsorbed by a filtering medium; carrying out buffering and flow regulation on the pretreated wastewater, and meanwhile, carrying out heat exchange on hot condensate water generated in the printing and dyeing production process and the pretreated wastewater; raising the temperature of the wastewater to 40 DEG C or above; pressurizing the heated wastewater and then carrying out membrane separation and concentration treatment, forming dialysate by micromolecular substances and part of water, and gradually accumulating intercepted macromolecular substances to form concentrated solution; when the concentration of the concentrated solution reaches the discharge standard, pollutants are treated by adopting a chemical precipitation method and a biological treatment method, or useful substances are recycled. The wastewater concentration process flow is optimized, the wastewater is filtered, intercepted and adsorbed through multiple media, a good water inlet condition is provided for concentration treatment, modified starch and PVA in the wastewater are effectively concentrated, and the follow-up treatment volume and difficulty are reduced.

The present invention provides a preparation method and application of a WS2 / g‑C3N5 heterojunction material, and relates to the technical field of heterojunction photocatalytic materials. The heterojunction material is composed of a layered g‑C3N5 and a layered WS2, and is in-situ synthesized by a hydrothermal method, and the preparation process is simple. The layered g‑C3N5 and the layered WS2 are stacked layer by layer to achieve maximum interface recombination. The strong interface effect ensures the efficient separation and transmission of photogenerated carriers. At the same time, the wide spectral response range and saturated light absorptivity of WS2 ensure the efficient absorption of sunlight by the heterojunction material. The WS2 / g‑C3N5 heterojunction material has good visible light degradation performance for various dye wastewaters.

The invention provides a dye / ion separation membrane with pore diameter and charge coordinated regulation and control as well as a preparation method and application thereof, and belongs to the field of preparation of a double-layer ionic covalent organic framework (COFs) composite membrane. An aromatic polyamide ultrafiltration membrane is used as a base membrane, and a double-layer COFs membrane is constructed on the surface of the aromatic polyamide ultrafiltration membrane through a multi-time interfacial polymerization method. The first layer is a positive charge COFs layer formed by reacting a guanidyl monomer with 1, 3, 5-triformyl phloroglucinol (Tp); and the second layer is a negative charge COFs layer formed by reacting ionic aromatic diamine with Tp. By adjusting the type and concentration of the monomers, the pore diameter and charge distribution of the film layer can be synergistically regulated and controlled, and the double-layer composite film which is stable in structure and orderly stacked is constructed. The obtained membrane has molecular sieve separation and electrostatic regulation functions, can efficiently intercept organic dye molecules in high-salt printing and dyeing wastewater, and has high flux, high selectivity and good chemical stability.

The invention relates to a preparation method of a polyester film based on full-hydroxyl column [5] arene. The polyester film with salt separation is prepared by taking full-hydroxyl column [5] arene as a water-phase monomer through an interfacial polymerization method. The method comprises the following steps: (1) synthesizing methoxy pillar [5] arene from 1, 4-dimethoxybenzene and paraformaldehyde under the catalysis of boron trifluoride diethyl etherate; (2) reacting the purified product with boron tribromide, and removing methyl groups to obtain full-hydroxyl column [5] arene; (3) dissolving the product in an aqueous solution containing triethylamine, and forming a two-phase solution of interfacial polymerization reaction with an n-hexane solution of trimesoyl chloride; and (4) sequentially coating the surface of the polyacrylonitrile ultrafiltration membrane with the aqueous phase solution and the organic phase solution, and carrying out interfacial polymerization reaction to obtain the polyester membrane. Based on the inherent cavity and polyhydroxy characteristics of the full-hydroxyl column [5] arene, compared with a traditional polyamide membrane, the obtained polyester membrane has high permeability and selectivity, can efficiently separate dye and inorganic salt, and is suitable for water treatment processes of printing and dyeing wastewater and the like.