1146 results about "Dyeing wastewater" patented technology

The invention belongs to the technical field of photocatalysts, and particularly relates to a coal gasification fine slag doped g-C3N4 photocatalyst and a preparation method and application thereof.The coal gasification fine slag and g-C3N4 are evenly mixed and calcined, the coal gasification fine slag is doped to the surface of g-C3N4, and the coal gasification fine slag doped g-C3N4 photocatalyst is constructed and used for degrading methylene blue under visible light; the separation of photon-generated carriers is promoted, the hole electron recombination efficiency is reduced, and the photocatalytic activity is improved. According to the method, the utilization way of the coal gasification slag is widened, and meanwhile, the dye wastewater is effectively degraded.

The invention discloses a hydrogel thin layer-foam-based solar evaporator and a preparation method and application thereof, and belongs to the field of water treatment. The invention provides a hydrogel thin layer-foam-based solar evaporator. The hydrogel thin layer-foam-based solar evaporator comprises a foam substrate, a photo-thermal layer and a hydrogel thin layer, a photo-thermal layer and a hydrogel thin layer are sequentially coated on the foam substrate, or the photo-thermal layer, the hydrogel thin layer and the photo-thermal layer are sequentially coated on the foam substrate. The photo-thermal layer is made of a carbon-based indium material and is obtained by mixing an indium nitrate solution and a trimesic acid solution, preparing a precursor through a hydrothermal method and calcining the precursor in a protective atmosphere. The hydrogel thin layer-foam-based solar evaporator has efficient evaporation rate and energy utilization efficiency, and under irradiation of one sun, the FCH evaporation rate and the energy efficiency are 7.93 kgm <-2 > h <-1 > and 315% respectively; in addition, the compound also shows excellent salt resistance in 3.5-20wt.% of saline water, and also has a relatively high evaporation rate in acid-base and various dye sewage.

The invention belongs to the field of MOF (Metal Organic Framework) films, and discloses a two-dimensional metal-organic framework film composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing ZIF-L nanosheets into a water phase solution containing MPD, camphor-10-sulfonic acid and TEA to obtain an MOF water phase monomer solution; adding TMC into an n-hexane reagent to obtain an organic phase monomer solution; fixing the wet PES ultrafiltration membrane, injecting the MOF water-phase monomer solution, carrying out suction filtration below the PES ultrafiltration membrane, removing the excess solution, keeping the suction filtration state, and immediately pouring the organic-phase monomer solution onto the surface of the PES ultrafiltration membrane from the upper part for reaction; and drying the obtained film at 60-80 DEG C for 10-15 minutes to obtain the two-dimensional metal-organic framework film composite film. The composite membrane has a good separation effect and can be applied to textile printing and dyeing wastewater treatment.

The invention discloses a chlorella microalgae and an application of the chlorella microalgae in sewage treatment, and the collection number of the chlorella is CCTCC (China Center for Type Culture Collection) 20231952. Chlorella is used for treating sewage, and for oil-containing food processing plant wastewater, compared with activated sludge, chlorella has no growth inhibition on high-oil wastewater. For printing and dyeing wastewater which cannot be treated by activated sludge, chlorella can be used for directly treating the printing and dyeing wastewater. The treatment of animal husbandry wastewater shows that the chlorella further degrades refractory organic matters (COD (Chemical Oxygen Demand) is reduced to 200mg / L or below) in the sewage and can replace an advanced treatment end, namely, the dosage of chemical agents is reduced, the secondary pollution is avoided, and the cost is saved. Meanwhile, the treatment conditions of anaerobic effluent and raw wastewater show that compared with an activated sludge method and an anaerobic digestion method, the chlorella can more quickly and efficiently remove organic matters in sewage.

The invention relates to the technical field of printing and dyeing wastewater treatment equipment, and discloses an improved textile printing and dyeing wastewater treatment device and a use method thereof.The improved textile printing and dyeing wastewater treatment device comprises an equipment shell, and a plurality of supporting legs are fixedly connected to the bottom of the equipment shell. According to the textile wastewater treatment device, a second gear rotates to drive a plurality of second auxiliary rotating shafts on a conveying rotating shaft to rotate, the second auxiliary rotating shafts rotate to drive a transmission filter screen to rotate, and meanwhile, a stirring rod rotates to drive wastewater in an inner cylinder to rotate along the inner wall of the inner cylinder; flocculation groups in the wastewater are attached to the surface of the transmission filter screen, and at the moment, the transmission filter screen rotates to convey the flocculation groups in the inner cylinder into the flocculation cavity, so that on one hand, a large number of flocculation groups in the inner cylinder can be reduced in time, and on the other hand, the flocculation groups which are flocculated into clusters can be transferred into the flocculation cavity; therefore, the situation that the stirring force of the stirring rod is too strong, flocculation groups are broken, and impurity separation is not facilitated is prevented.

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 belongs to the technical field of electrocatalytic oxidation, and particularly relates to an electrocatalytic active anode film capable of efficiently producing active chlorine and a preparation method and application of the electrocatalytic active anode film. Porous foam titanium is used as a base material, a surface oxidation layer is removed through acidification pretreatment, a titanium dioxide nanotube array grows on the base material in situ through two times of anodic oxidation to serve as a middle layer, and the binding force of the catalyst and the substrate is effectively improved; meanwhile, Ti < 4 + > in TiO2 is partially converted into Ti < 3 + > through a cathode reduction method, so that the conductivity of the material can be enhanced; furthermore, a RuO2 catalytic layer capable of reducing the chlorine evolution potential is loaded on the titanium dioxide nanotube array, so that the electrocatalytic activity is improved. The prepared anode film has a porous structure, and when the anode film is applied to a Flow-through system, the yield of active chlorine and the contact oxidation efficiency of pollutants on an interface of the anode film are improved, and the problem of mass transfer limitation is solved. The electrocatalytic active anode film can realize high-efficiency decoloration of printing and dyeing wastewater under the conditions of no addition of chemicals and low energy consumption.

The invention provides a bismuth oxybromide-based photocatalytic material, and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate and polyvinylpyrrolidone in an alcoholic solution, rapidly stirring to obtain a mixed solution, adding potassium bromide into the mixed solution, and continuing to fully stir for reaction; and (2) transferring the mixed solution into a reaction kettle with a polytetrafluoroethylene lining, carrying out solvothermal reaction, carrying out centrifugal suction filtration separation on the obtained product, washing and drying to obtain the photocatalytic material. The bismuth oxybromide-based photocatalytic material, the preparation method and the application have the advantages that the bismuth oxybromide-based photocatalytic material is excellent in performance and high in visible light response capability, dyes can be quickly degraded in a short time, and the treatment efficiency of printing and dyeing wastewater can be obviously improved.

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 relates to the field of printing and dyeing wastewater treatment equipment, in particular to printing and dyeing wastewater circulation treatment equipment with a treatment volume adjustable function, which comprises a mixing box body for supporting and a sealing cover plate fixedly arranged on the upper end surface of the mixing box body and used for sealing, and two groups of feeding guide pipes are arranged on the upper end surface of the sealing cover plate. According to the invention, the transmission clamping shaft drives the mixing blade plate to chemically treat printing and dyeing wastewater in the mixing box body, and meanwhile, the transmission clamping shaft can synchronously provide power for the wastewater treatment device and the centrifugal filtration device, so that the wastewater treatment device can carry out filter pressing and harmful substance adsorption treatment on the printing and dyeing wastewater; meanwhile, the centrifugal filtration device can perform centrifugal filtration on the wastewater, and the multi-level advanced treatment efficiency of the equipment on the wastewater can be effectively improved in a treatment mode of combining physical treatment and chemical treatment, so that the qualified rate of the equipment on the printing and dyeing wastewater treatment is improved to the greatest extent.

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 belongs to the technical field of membranes, and discloses a preparation method and application of a small-aperture amination-polyamide roll type ultrafiltration membrane, a polyamide layer is subjected to amination treatment by using DETA (diethylenetriamine), the electronegativity of the surface of the membrane is changed by optimizing the concentration of DETA, the charge property of the surface of the membrane is optimized, and the electronegativity of the surface of the membrane is reduced, so that the ultrafiltration membrane is prepared. Therefore, the influence of the electrostatic repulsion effect on the rejection rate is reduced, and the separation performance of the membrane on small-molecular organic matters / inorganic salts is improved. The preparation method is simple to operate and low in cost. The prepared small-aperture amination-polyamide roll type ultrafiltration membrane can be used for recycling RO concentrated water in the field of printing and dyeing wastewater treatment and the application fields of purification and decoloration of macromolecules such as protein, polypeptide and drugs in the pharmaceutical industry.

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 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 is prepared from a multi-acyl chloride organic solution and an amine monomer water-phase solution on the surface of a porous supporting membrane through a one-step interfacial polymerization method, and the rejection rate of the loose nanofiltration membrane to methyl blue, Congo red and other dyes is 95% or above; meanwhile, the loose nanofiltration membrane has high water permeability and excellent dye / inorganic salt separation selectivity, and is expected to have wide application prospects in the fields of dye production and purification and dye wastewater desalination.

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 discloses a preparation process and application of a chemical flocculant for textile printing and dyeing wastewater treatment, and the preparation process comprises the following steps: selecting chitosan and starch as main raw materials, modifying the starch through oxidation treatment or cationization treatment, and combining aluminum salt, ferric salt, citric acid and lactic acid according to a specific ratio, so as to obtain the chemical flocculant for textile printing and dyeing wastewater treatment. Synthesizing a stable composite material under the condition of controlling the temperature and the pH value; the preparation method comprises the following steps: preparing a composite material, drying the composite material, crushing the dried composite material into a powdery flocculating agent with uniform particle size, and finally mixing the powdery flocculating agent with a polyacrylamide auxiliary agent to prepare the efficient flocculating agent. The method is suitable for treating wastewater with high chroma and refractory organic matters.

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 printing and dyeing wastewater filtering and cleaning equipment comprises a treatment tank, and the high end of the side wall of one side of the treatment tank is connected with a water inlet pipe; a first push rod motor pulls a main filter plate to move backwards along a first round rod, meanwhile, the main filter plate drives a connecting rod to move backwards, when the side, facing a water inlet pipe, of the main filter plate moves to be aligned with the rear side of a through hole, movement of the main filter plate is stopped, meanwhile, the connecting rod drives a driving rack to move backwards, and the driving rack drives a top gear to rotate; the top gear drives a rotating shaft to rotate, the rotating shaft drives a bottom gear to rotate, the bottom gear drives a driven rack to move, and the driven rack moves to the main filter plate along a second round rod, so that an opening of the main filter plate in a compartment of the supporting pipe is shielded, and the main filter plate can be separated from continuous impact of sewage; the opening of the supporting pipe at the standby filter plate is opened, so that the standby filter plate continues to filter, and the situation that continuous filtration of sewage is delayed is avoided.

The invention discloses a membrane bioreactor for treating printing and dyeing wastewater, which comprises a membrane bioreactor for treating printing and dyeing wastewater. Comprising a reaction tank, a bracket horizontally arranged in the reaction tank, a plurality of membrane assemblies distributed on the bracket side by side, four baffles supported in the reaction tank and an aeration pipe extending to the lower part of the bracket, the four baffles are arranged on the peripheral sides of the membrane assemblies in a surrounding manner, and the aeration pipe is used for aerating towards the membrane assemblies; generated bubbles act on membranes of the membrane assembly, circulating flow flows upwards along the outer sides of the four baffles under the blocking action of the outer sides of the four baffles, a small part of flow descending area exists on the upper portions of the inner sides of the four baffles, gas phase distribution is widened through the four baffles, and the gas gathering phenomenon is relieved. According to the membrane bioreactor provided by the utility model, a gas phase generated by the aeration effect is uniformly distributed among the membranes, and the surface stress of the membranes is more uniform, so that the aeration efficiency of the membrane bioreactor is improved, and the operation energy consumption of the membrane bioreactor is further reduced.

The invention relates to an intelligent water affair data monitoring management method and system, and relates to the field of water affair management, and the method comprises the steps: carrying out the alignment optimization processing of historical and current total nitrogen significance distribution and historical and current total phosphorus significance distribution, and obtaining the position deviation distribution of total nitrogen and total phosphorus; according to the position deviation of a plurality of positions in the total nitrogen and total phosphorus position deviation distribution, calculating to obtain a pollution source moving step length; according to the historical total nitrogen distribution, the historical total phosphorus distribution, the current total nitrogen distribution and the current total phosphorus distribution, the nitrogen and phosphorus change amplitude is obtained through calculation, searching is conducted in combination with the pollution source moving step length, and a pollution source searching result is obtained. The technical problem of limited treatment and removal effects of nitrogen and phosphorus compounds in the printing and dyeing wastewater in the prior art can be solved, and the technical effect of improving the water affair treatment management efficiency of the printing and dyeing wastewater is achieved.

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.