458 results about "Dyeing wastewater" patented technology

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 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 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 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 an advanced oxidation printing and dyeing wastewater treatment process, and belongs to the technical field of sewage treatment. The method comprises the following steps: adding an aluminum oxide catalyst into to-be-treated printing and dyeing wastewater in a reactor, and stirring; adding an auxiliary agent, and mixing and stirring; adding an oxidizing agent potassium monopersulfate into the obtained mixed solution and stirring; under the irradiation of an ultraviolet light source, continuously introducing ozone prepared by an ozone generator into the reactor for stirring reaction. Pollutants such as refractory dyes and organic auxiliaries in the printing and dyeing wastewater are efficiently removed under mild conditions, the COD removal rate of effluent reaches 90% or above, the chroma removal rate reaches 90% or above, and the quality of the effluent meets the requirements of subsequent treatment or up-to-standard discharge.

The invention relates to the technical field of industrial wastewater treatment and resource recovery, discloses a printing and dyeing wastewater desizing water alkali recovery method, and solves the problem of low recovery treatment efficiency caused by serious membrane pollution when printing and dyeing desizing wastewater is treated by an existing membrane separation technology. The method comprises the following steps: carrying out homogenization and dissolved air flotation pretreatment on high-temperature desizing water to remove most of grease and suspended solids; then, clear liquid is filtered through an ultrafiltration membrane, a negative pressure environment is constructed on the membrane shell side to extract penetrating fluid in real time, meanwhile, fine bubbles are injected into feeding liquid to form gas-liquid two-phase flow, and the net pushing force of the membrane surface is controlled to be maintained in a 0.02-0.04 MPa micro-positive pressure interval so as to reduce membrane pollution; and carrying out nanofiltration purification on the primarily filtered water to finally obtain high-purity recovered alkali liquor. According to the invention, the problems of serious membrane pollution and fast flux attenuation in the traditional membrane treatment process are effectively solved, and efficient recovery of alkali and long-term stable operation of the system are realized.

The invention discloses a tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst, a preparation method thereof and an application of the tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst in degrading azo dyes by activating peroxymonosulfate. According to the method, a carbonate intercalated ternary LDH precursor is synthesized through a hydrothermal reaction, interlayer anions are replaced with nitrate and tetrathiomolybdate through ion exchange, and the target catalyst is obtained. In the catalyst, a unique Fe-Mg-Zn ternary metal laminate and a MoS < 2-> intercalation structure cooperatively construct a multi-active center, and MoS < 2-> is used as an electron donor to promote cyclic regeneration of Fe < 3 + > / Fe < 2 + >. The catalyst keeps ultrahigh activity in a wide range of pH (potential of hydrogen) of 3-9, can completely degrade 10 mg / L of acid orange 7 within 5 minutes, and is stable in structure and low in metal dissolution risk. The problems of low activity, slow Fe < 3 + > reduction, metal ion dissolution and the like under neutral and alkaline conditions in an advanced oxidation technology based on peroxymonosulfate are solved, and the method has important application value in the field of printing and dyeing wastewater treatment.

The invention relates to the field of seawater desalination, and discloses a bamboo fiber aggregate solar interface evaporator with an open water transportation channel and a preparation method and application thereof. The preparation method comprises the following steps: selecting a bamboo tube with two open ends, cutting off bamboo green at the upper end, and reserving partial bamboo green at the bottom; sequentially treating the bamboo tube with sodium hydroxide and hydrogen peroxide to obtain a dispersed vascular bundle bamboo tube; and modifying the surface of the dispersed vascular bundle bamboo tube with a photo-thermal absorption material, and cleaning to obtain the bamboo fiber aggregate solar interface evaporator. The evaporation rate under standard sun illumination reaches 3.376 kg.m <-2 >. H <-1 >, the apparent evaporation efficiency is about 150%, and stable evaporation can still be kept without salt crystallization under the high-salinity condition. The ion concentration of the obtained condensate water is far lower than the original seawater level, the obtained condensate water meets the drinking water standard of the World Health Organization, meanwhile, organic pollutants in dye wastewater can be effectively removed, and the functions of seawater desalination and wastewater purification are achieved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an adsorption particle electrode for wastewater and waste liquid treatment and a preparation method thereof. The preparation method comprises the following steps: adding a zinc salt, a vanadium salt, a scandium salt and cetyltrimethylammonium bromide into water, stirring, adjusting the pH value at 70-80 DEG C, continuously stirring, filtering, drying and calcining to obtain modified mesoporous zinc oxide; and dispersing the modified mesoporous zinc oxide in water, adding the composite aerogel, soaking, filtering, washing, drying and grinding to obtain the adsorption particle electrode. The adsorption particle electrode prepared by the invention can be used for degrading printing and dyeing wastewater, and has the excellent performances of high degradation rate, high degradation speed, reusability and the like.

The invention discloses an indium-based metal-organic framework material based on a pyridine hexacarboxylic acid ligand as well as a preparation method and application of the indium-based metal-organic framework material, the chemical formula is {[NH2Me2] 2 [In4 (mu2-O) (H6L) 2 (H2O) 2]. 3DMF. 10H2O} n, and H6L is an organic ligand 4, 4 ', 4' '-(pyridine-2, 4, 6-triyl) triisophthalic acid. The material has excellent thermal stability and chemical stability, and due to the frame charge characteristic and the excellent pore structure of the material, the metal organic frame material shows efficient dye selective adsorption and separation performance, can selectively adsorb cationic dye methylene blue MB and repel anionic dye methyl orange MO at the same time. In conclusion, a new design thought is developed for the novel indium-based metal organic framework material based on the pyridine hexacarboxylic acid ligand, and meanwhile, a new candidate is provided for developing a high-efficiency dye wastewater purification material.

The invention relates to a method for treating printing and dyeing wastewater. The method comprises the following steps: neutralization regulation, primary filtration for removing scum, decoloration and flocculation, secondary filtration, pH regulation, catalytic degradation under visible light, MBR membrane treatment and discharge. The printing and dyeing wastewater treatment process provided by the invention is compact in link, the first-stage filtration, decoloration flocculation and second-stage filtration in the treatment process all adopt conventional technical means in the field, the operation is simple and convenient, the cost is low, and a special bismuth-based aerogel composite material is used as a catalyst for photocatalytic degradation at the rear end; the aerogel is prepared by cross-linking a modified graphene oxide / BiOCOOH composite photocatalyst with an acrylic polymer matrix and then carrying out supercritical drying, so that macroscopic immobilization of a nano catalyst is realized. According to the method, the technological process is compact, the cationic dye which is difficult to biologically treat can be efficiently degraded, the industrial problems that a powder catalyst is easy to lose and difficult to recycle are solved, key indexes such as COD and chromaticity of the treated wastewater are remarkably reduced, and the treated wastewater can be discharged after reaching the standard.

The application discloses a preparation method and application of blue-green algae-based biochar with Fenton-like oxidation function. The preparation method comprises the following steps: (1) selecting an iron-containing flocculant, adding the iron-containing flocculant into natural lake water containing blue-green algae, and then performing sufficient stirring, standing, filtration, drying, crushing and sieving to obtain blue-green algae powder; (2) placing the blue-green algae powder in a tubular furnace for pyrolysis treatment to obtain preformed carbon; then, immersing the preformed carbon in an activating agent solution, performing sufficient immersion, drying, placing the preformed carbon in the tubular furnace for activation treatment, and finally performing heat treatment under air atmosphere to obtain blue-green algae-based biochar material with Fenton-like oxidation function. The application provides application of the prepared blue-green algae-based biochar in dye wastewater treatment, and the dye wastewater treatment is performed in the presence of hydrogen peroxide, and the blue-green algae-based biochar has high degradation removal rate and high stability.

The invention discloses a method for catalytically degrading dye wastewater based on tetrahedrite. The method comprises the steps that tetrahedrite is subjected to mechanical activation and then mixed with peroxymonosulfate, the mixture is added into dye wastewater, the initial pH of a system is adjusted, a catalytic degradation reaction is carried out, tetrahedrite is recovered after the reaction is finished, and tetrahedrite is obtained. The mass molar ratio of tetrahedrite to peroxymonosulfate is (0.33-6): 1g / mmol; the mass ratio of tetrahedrite to organic residues in the dye wastewater is (10-80): 1. According to the method, active sites on the surface of tetrahedrite are used for adsorbing PMS molecules, PMS is activated through electron transfer to generate active free radicals, singlet oxygen in the active free radicals plays a main role, superoxide free radicals and sulfate free radicals play auxiliary roles, and therefore the catalytic activity and the degradation rate of organic matter in dye wastewater are greatly improved.

The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a printing and dyeing wastewater treatment and recycling device and a treatment method thereof, and solves the problems that impurities in filter holes cannot be treated by a scraper blade, and precipitates are possibly discharged along with the filter holes when the treated printing and dyeing wastewater is discharged. Comprising a printing and dyeing wastewater treatment tank, and a collection type high-precision filter screen cleaning mechanism is installed on the upper end face of the printing and dyeing wastewater treatment tank. The collection type high-precision filter screen cleaning mechanism can drive a plurality of dredging rods to cyclically penetrate filter holes in a filter screen, so that impurities in the filter holes are extruded out, and meanwhile, before treated printing and dyeing wastewater is discharged, precipitates can be fixed through a precipitate fixing and leakage preventing mechanism, so that the treatment efficiency is improved. According to the technical scheme, the condition that sediments are discharged along with the treated printing and dyeing wastewater can be prevented while the cleaning effect of the equipment on the filter screen is improved.

The application discloses a preparation method and application of a POMs-PEI nanofiltration membrane and belongs to the nanofiltration membrane preparation and application field. 12 The preparation method of the nanofiltration membrane is as follows: step 1, performing first soaking treatment on a PAN membrane in a PMo 12 solution to obtain a POMs modified membrane; and step 2, performing second soaking treatment on the POMs modified membrane in a PEI solution and then performing third soaking treatment on the POMs modified membrane in a glutaraldehyde solution to obtain the POMs-PEI nanofiltration membrane. The application solves the problem of low dye and salt ion separation efficiency of traditional polymer membrane treatment industrial printing and dyeing wastewater, the prepared nanofiltration membrane has excellent dye and salt separation performance and chemical stability, the preparation process is simple, and the nanofiltration membrane is suitable for large-scale industrial production.

This invention discloses a ternary composite adsorbent based on iron-catechol-boric acid, its preparation method, and its application, belonging to the field of dyeing and printing wastewater treatment. The adsorbent of this invention uses tannic acid with a surface rich in catechol groups as a substrate. A stable metal-phenolic network is formed through the coordination of trivalent iron with catechol groups, efficiently capturing anions using metal bridging and electrostatic attraction to form the adsorption core. Boric acid groups are further introduced as specific recognition units, forming specific dynamic covalent bonds with the catechol groups of anionic dyes. Compared with traditional adsorbents, the adsorbent of this invention provides ultra-high adsorption capacity and selectivity through the synergistic effect of multiple mechanisms, including electrostatic adsorption, coordination complexation, hydrogen bonding, and reversible covalent bonding of borate ester bonds. It can achieve efficient desorption of dyes and recycling of materials, and efficiently and rapidly remove anionic dyes from water.

The invention relates to the technical field of dye separation, and discloses a loose nanofiltration membrane and a preparation method and application thereof, the loose nanofiltration membrane comprises a porous support membrane, and a polyesteramide separation layer formed on the porous support membrane through one-step interfacial polymerization of nucleoside monomers and multi-acyl chloride monomers. The nucleoside monomer is one or more than two of adenosine, guanosine and cytidine nucleoside. The nucleoside monomer with a long-chain structure, a branched-chain structure, a rigid twisted structure and a plurality of hydrophilic reaction sites is selected as an interfacial polymerization water-phase monomer, so that the loose nanofiltration membrane is endowed with excellent permeation and separation performance. The membrane has a high rejection rate on dye molecules such as Congo red and methyl blue, also has high water permeability and extremely high dye / inorganic salt separation selectivity, and shows good application potential in the aspects of dye production and purification and dye wastewater recovery.

The utility model discloses an environment-friendly textile printing and dyeing wastewater purification device, which belongs to the technical field of textile wastewater purification, and adopts the technical scheme that the environment-friendly textile printing and dyeing wastewater purification device comprises a treatment tank, a water passing frame is arranged on the inner side of the treatment tank, baffles are fixedly connected to the front side and the rear side of the water passing frame, and filter assemblies are arranged on the two sides of the water passing frame; a water passing net is arranged at the bottom of the water passing frame, an isolation plate is fixedly connected to the inner side of the water passing frame, the treatment pond is arranged as a wastewater purification container, the arranged water passing frame can horizontally move along the inner side of the treatment pond, and filtration can be carried out through the filtering assembly while the water passing frame moves; when water flow passes through the filtering assembly, the baffle is pushed along the rotating shaft, floccules and large-size impurities in the water flow can flow into the water passing frame through the circulating groove together, movement of the water passing frame is stopped periodically, the impurities, the floccules and the like can be precipitated in the container net bag, and at the moment, the container net bag can be taken down to be cleaned or replaced.

The invention discloses a bisazo blue reactive dye for high-temperature dip dyeing as well as a preparation method and application of the bisazo blue reactive dye. The reactive dye is shown in a structural general formula (I). A color body of the reactive dye is of a bisazo structure, the color body contains two naphthalene ring structures and a benzene ring structure, and an active group in a dye molecular structure is quaternary ammonium salt containing a nicotinic acid structure. According to the present invention, the binding force between the dye and the fiber can be improved through the coplanarity of the chromophore molecules, the dissociation between the dye and the fiber at the high temperature can be reduced, and the dye uptake of the dye at the high temperature can be improved, such that the fixation rate between the dye and the fiber can be improved; meanwhile, quaternary ammonium salt containing a nicotinic acid structure can react with fibers under the high-temperature neutral condition, an alkaline agent does not need to be added in the whole dyeing process, the problem of environmental pollution caused by the alkaline agent in the printing and dyeing wastewater is solved, and wide application prospects are achieved.

The invention belongs to the technical field of membrane separation, and discloses a composite membrane formed by compounding a loose nanofiltration layer on an ultrafiltration layer and a preparation method and application of the composite membrane. Polyphenol covalent bonds and non-covalent bonds (hydrogen bonds, pi-pi accumulation) are adsorbed on an ultrafiltration membrane matrix to form functional active sites, and then a low-activity aldehyde group substance and polyphenol are subjected to a Schiff base reaction to form a covalent anchoring network; then a flexible long-chain amido substance is introduced to slowly permeate into the network to carry out Michael addition reaction or Schiff base reaction, supplementary crosslinking is carried out with residual functional groups, and finally, the flexible long-chain amido substance reacts with a low-concentration aldehyde solution for a short time to carry out secondary surface crosslinking to form a stable and loose nanofiltration layer network structure. Through step-by-step and interface regulation and control design, the process is simple, the condition is mild, stable and repeated preparation can be realized, and an innovative high-performance technical solution is provided for the practical application of the membrane material for deep treatment and resource recycling of dye wastewater.

The invention discloses a printing and dyeing wastewater pollutant collaborative removal treatment method, which relates to the technical field of wastewater treatment, and comprises the following steps: tracking the concentration change linkage condition of pollutants in printing and dyeing wastewater pollutant collaborative groups, dividing coupling strength gradients according to pollution load and key pollutant concentration, and generating a coupling strength gradient configuration set; according to the coupling strength gradient configuration set, pollution load range reading, key pollutant concentration interval matching and collaborative strategy type screening are carried out, a regulation and control strength range is set, and a multi-stage collaborative regulation and control rule chain is generated; and combining the multi-stage coordinated regulation rule chain with the printing and dyeing wastewater multi-source monitoring record, carrying out real-time scheduling, obtaining and executing a coordinated removal treatment strategy, and generating a coordinated treatment water quality state set. According to the method, the linkage pollutants are accurately identified, the treatment pertinence of water, wastewater, sewage or sludge is improved, meanwhile, the dynamic matching of the treatment strategy and the water quality state is realized, and the treatment efficiency and stability of water, wastewater, sewage or sludge are improved.

The application discloses a dye degradation system and method with rice straw as a carbon source, and belongs to the technical field of wastewater treatment. The application successfully constructs an economical combined degradation system by combining the ability of white rot fungi to decompose macromolecular organic matter and the characteristics of the power generation microorganism MR-1 to degrade pollutants in a broad spectrum and efficiently. The system uses rice straw as a carbon source, uses white rot fungi to degrade the rice straw, obtains a degraded straw solution, and then uses the power generation microorganism MR-1 to perform anaerobic respiratory metabolism on the degraded straw solution, releases electrons, and transmits the electrons to dye pollutants, so as to degrade dye wastewater. The combined degradation system can not only make up for the deficiency of the power generation microorganism MR-1 in utilizing macromolecular organic matter carbon sources, but also can significantly reduce the cost of carbon sources, and simultaneously realize the dual goals of wastewater treatment and solid waste resource utilization. The method is environmentally friendly, treats waste with waste, and has potential to be popularized and applied in practical application.

The utility model belongs to wastewater treatment equipment technical field, specifically disclose a kind of printing and dyeing wastewater enhanced treatment device, including shell, partition and flow guide mechanism;Shell is divided into oxidation layer, biological layer and self-cleaning membrane separation layer from top to bottom inside, partition is transversely installed at each layer junction, and partition is arranged with nanometer gradually increasing drainage hole in order;Flow guide mechanism includes the flow guide plate that can automatically retract, and flow guide plate is respectively arranged in oxidation layer and biological layer, and flow guide plate is vertically arranged, and the top of flow guide plate is rotatably connected with shell inner wall, and is equipped with power source, and the bottom of flow guide plate is always with the upper surface of corresponding partition abuts, and the two side walls of flow guide plate are bonded with its opposite shell inner two side walls.Using the technical scheme, utilize partition and flow guide mechanism, control small molecule organic matter in each layer more quickly enter next layer, macromolecular dye stay time is longer, make macromolecular dye degradation more fully, avoid small molecule organic matter be overmineralization.

The invention discloses a printing and dyeing sewage treatment sedimentation tank. The printing and dyeing sewage treatment sedimentation tank comprises a tank body, a stirring module and a separation module, the tank body is divided into a water inlet area, a settling area and a water outlet area, and the bottom of the tank body is used as a sludge area; the stirring module is arranged in the water inlet area and used for uniformly mixing sewage and chemical agents, and the separation module is arranged in the water outlet area and used for physically separating small particles. The stirring module replaces the increase of the cleaning frequency, so that the probability of blockage of the tank body is reduced, the tank body runs more stably, the economic cost, the labor cost and the like of the tank body are reduced, and the economical efficiency is better. The separation module is used for filtering the water discharged from the water outlet area, so that small particles are intercepted, and the water quality of the discharged water is favorably improved.

The application provides a variable-price rare earth element doped black titanium dioxide catalyst and a preparation method and application thereof, and belongs to the technical field of environmental functional materials and water pollution treatment. The catalyst is prepared by a sol-gel method combined with calcination in a hydrogen-argon mixed atmosphere, with tetrabutyl titanate as a titanium source and lanthanum nitrate and cerium nitrate as rare earth doping sources. Lanthanum / cerium doping can effectively inhibit the generation of rutile phase in the black titanium dioxide, increase the specific surface area, narrow the band gap and construct oxygen vacancy defects, and significantly improve the photocatalytic activity. The preparation process is simple, the cost is controllable, the catalyst has a remarkable selective degradation effect on specific dyes, and an efficient solution is provided for dye wastewater treatment.

The application discloses a preparation method and application of a novel LBL marine biomass hydrogel composite membrane. The preparation steps of the hydrogel composite membrane are as follows: adding chitosan quaternary ammonium salt into 0.1 M tris-hydrochloric acid solution to obtain chitosan quaternary ammonium salt solution through heating and stirring; adding sodium alginate into tris-hydrochloric acid solution to obtain sodium alginate solution through heating and stirring; taking an ultrafiltration membrane as a base film, spreading the chitosan quaternary ammonium salt solution on the surface of the base film first, pouring away the excessive solution after standing, and then spreading the sodium alginate solution on the chitosan quaternary ammonium salt solution after heat treatment in an oven, pouring away the excessive solution after standing, and heat treating in the oven to obtain a self-assembled hydrogel composite membrane. The layer-by-layer self-assembled hydrogel composite membrane is obtained through repeating the above process for multiple times. The preparation method is simple, the material is green and environment-friendly, the obtained membrane surface has superhydrophilicity, obvious separation efficiency is shown in dye wastewater treatment, and strong anti-pollution performance is shown.

The invention discloses a printing and dyeing wastewater nanofiltration membrane anti-pollution-separation performance evaluation method, and belongs to the field of membrane separation technology performance detection.The evaluation method comprises the steps that a to-be-detected nanofiltration membrane is designed for staged pollution experiments, actual printing and dyeing wastewater is filtered, and the nanofiltration membrane for continuously filtering the printing and dyeing wastewater is subjected to staged cleaning regeneration; and testing data such as flux, methylene blue rejection rate and NaCl rejection rate in the experiment process, calculating a flux comprehensive attenuation rate, a graded recovery rate, a separation performance stability coefficient, a charge stability coefficient and a hydrophilic promotion rate, and evaluating the anti-pollution-separation performance grade of the to-be-tested nanofiltration membrane according to calculation results. The technical defects that parameters of a traditional evaluation system are disjointed and dimensions are one-sided are overcome, and the evaluation method can directly guide modification optimization and engineering type selection of the nanofiltration membrane for printing and dyeing wastewater treatment.