51results about How to "Help recycling" patented technology

The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural. The method is applicable to herbaceous plants, in particular.

A process for removing Mg from phosphorus ore in order to prepare phosphoric acid by wet method features use of static microbubble floatation column, and includes such steps as breaking the crude phosphorus ore, grinding, classifying, mineralizing by mixing the reverse floatation chemical with ore sludge, and floatating in said static microbubble floatation column while conditioning the ore sludge to obtain the bubble-phase tailings and low-Mg phosphorus ore concentrate from the column bottom.

The invention relates to the technical field of manufacturing of artificial fiberboards, in particular to a method for producing a fiberboard containing an ultramicro amount of residual formaldehyde. The method for producing the fiberboard comprises the technological steps of preparation of adhesive, manufacturing of wood fibers, adhesive application, drying, mat formation and pre-pressing, hot pressing and obtaining of a finished product. According to the method, forest logging residues or wood processing residues or bagasse or other materials are used as raw materials for producing the fiberboard, waste materials are changed into valuable things, and full utilization of wood resources is effectively achieved; the adhesive used for producing the fiberboard is adhesive containing only a micro amount of residual formaldehyde, in this way, environmental friendliness and safety are achieved, and the fiberboard has good water resistance and high bonding strength; the fiberboard produced by using the adhesive hardly contains residual formaldehyde and high in binding powder; the content of substances harmful to human bodies is low, the substances harmful to the human bodies hardly exist, and thus harm to the human bodies is reduced; in addition, the internal structure of the board is uniform, the density is proper, the dimensional stability is high, the quality is stable, and the service life is long.

The invention provides an overrun clutch achieving rotating speed control drive and driven power reversing. The overrun clutch is formed by combining two sets of pin roller overrun clutch bodies. An inner ring base and an outer ring base of the first set of pin roller overrun clutch body are fixedly combined with an outer ring base and an inner ring base of the second set of pin roller overrun clutch body respectively. In the initial stage, pin rollers of the two sets of pin roller overrun clutch bodies make contact with and separate from the inner walls of the outer ring bases through springs respectively. The clutch works in a low-speed state, a middle-speed state and a high-speed state. At the low speed, a drive mechanism drives a driven mechanism to rotate through the first set of pin roller overrun clutch body. At the middle speed, the speed of the driven mechanism is increased to exceed the speed of the drive mechanism, and the pin roller overrun clutch bodies are in a separation state. At the high speed, the speed of the driven mechanism is higher than that of the drive mechanism, the second set of clutch body works and reversely drags an original drive mechanism, and power reversing is achieved. The clutch can be applied to the aspects such as electric cars and engine turbine supercharging systems, the performance of a car is improved under driving of a motor at the low speed, the motor is reversely dragged for power generation to achieve energy saving at the high speed, and it is guaranteed that the mechanisms run within the appropriate speed range.

The invention discloses a method for treating high-salt wastewater and recycling nutritive salt through a microbial desalination cell. The method comprises the steps of (1) acclimating an anodic microbe under the conditions with high salinity and high ammonium; (2) sequentially assembling a cathode chamber, a recycle chamber and an anode chamber to form a microbial desalination cell, separating the cathode chamber and the recycle chamber through an anion-exchange membrane, separating the anode chamber and the recycle chamber through a cation-exchange membrane, and adopting a carbon brush and an air cathode as an anode material and a cathode material; and (3) inoculating the acclimated anodic microbe to the carbon brush, adopting the high-salt wastewater as an anode chamber water intake matrix, operating the desalination cell by adopting an intermittent water intake and cathode-anode fluid circulation type operation mode, and collecting the nutritive salt through the recycle chamber. According to the method provided by the invention, the degradation of complex organic matters is remarkably promoted, the organic matter removal rate can reach to more than 90 percent along with the increase of ammonium concentration, part of nutritive salt is recycled, the wastewater treatment cost is effectively reduced, and the method is economic and environmental-friendly.

The invention discloses a household pure water machine which is mainly composed of an intake tee joint (15), a pressure-limiting valve (21), a first-stage filter cylinder (13), a front water breaking solenoid valve (12), a booster pump (11), a second-stage filter cylinder (10), a third-stage filter cylinder (9), a reverse osmosis filter cylinder (5) and a rear filter barrel (2), which are all interconnected in sequence. The pure water machine is characterized in that a water-saving drainage and flush solenoid valve (18) provided with a water inlet (101) and a concentrate collecting port (115), and a mixed water storage barrel (20) provided with a mixed water outlet (213) and an original water port (214) are arranged between a concentrated water outlet end of the reverse osmosis filter cylinder (5) and the waterways of the pressure-limiting valve (21) and the front water breaking solenoid valve (12). In the process of operating for water-making, the household pure water machine of the invention can automatically recycle the generated concentrated water, preferentially utilize the recycled concentrated water while using tap water and can automatically replenish the tap water after the concentrated water is used up.

The invention discloses environment-friendly construction waste treatment equipment for civil engineering, and relates to the technical field of civil engineering. The environment-friendly construction waste treatment equipment for the civil engineering comprises a machine body, wherein a feeding hopper is arranged at the top end of the machine body, a crushing mechanism is arranged above the interior of the machine body, a vibration screening mechanism is arranged in the middle of the interior of the machine body, a collecting mechanism is arranged at the bottom of the interior of the machine body, one side of the machine body is connected with a first discharging pipe corresponding to the vibration screening mechanism, and one side of the bottom of the machine body is connected with a second discharging pipe communicating with the collecting mechanism. According to the environment-friendly construction waste treatment equipment, through the arrangement of a cleaning brushing mechanism, the crushing mechanism can be cleaned and brushed, so that the crushing mechanism is cleaned, crushed materials are effectively prevented from remaining on the crushing mechanism, rapid crushing of waste materials is facilitated, the crushing efficiency of the crushing mechanism is greatly improved, and the working efficiency of the equipment is improved favorably.

The invention discloses a method for comprehensively utilizing gasification ash. The method comprises the following steps: 1) the gasification ash is preliminarily dehydrated to obtain concentrated ash; 2) the concentrated ash is further dehydrated and dried by exchanging heat with a gasification heat carrier medium to obtain dry ash with a low water content; and 3) the dry ash is combusted and reused. The invention also discloses a system using the method for comprehensively utilizing gasification ash. The system comprises a concentrating system, a drying system and a combustion system; and the concentrating system reduces water in the gasification ash and increases the relative content of residual carbon in the gasification ash, the concentrated ash is further dried and dehydrated by using excess heat carried by the gasification heat carrier medium in the drying system, and then the product is sent to the combustion system and is combusted and reused. The method and the system have the advantages of full utilization of the waste heat of a gasification device, recycling of the residual carbon in the ash, increase of the overall heat utilization efficiency of the device, reductionof the ash treatment cost and the adverse impact on the environment, and good economic and environmentally-friendly benefits.

The invention discloses a method for recovering nickel resource in a waste acid system. The method comprises the following steps: (1) adding a lime neutralizer into waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and carrying out filter pressing to obtain filtrate A and filter residues A; (2) adding a strong alkali neutralizer into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizer, and adjusting the pH value to 9.0-11.0 to obtain a mixed solution; (3) adding a heavy metal remover into the mixed solution, stirring, and carrying out filter pressing to obtain filtrate B and nickel mud; and (4) drying and dehydrating the nickel mud to obtain a nickel product. According to the method, three-step neutralization is carried out by using different neutralizers in sequence, the recovery rate of nickel in the waste acid and the purity of nickel products can be effectively improved, pollution to the environment is reduced, the process of the recovery method is simple, the price of the used neutralizers is low, and the cost can be greatly reduced.

The invention discloses a puerpera nutritive meal. The puerpera nutritive meal is designed according to special physiological and psychological characteristics of puerperae just after delivery and is a systematized three-month adjustment nourishing meal realizing expelling, adjustment and nourishing. Expelling-effect components of the puerpera nutritive meal comprise, by weight, 3-5 parts of Chinese angelica, 2-4 parts of ligusticum wallichii, 1-3 parts of peach seed, 2-4 parts of baked ginger, 1-2 parts of licorice root and 10-15 parts of glutinous rice. Adjustment-effect components of the puerpera nutritive meal comprise, by weight, 0.6-1 part of pilose asiabell root, 1-3 parts of radix ophiopogonis, 0.8-1.5 parts of wolfberry, 0.6-1.3 parts of Chinese yam, 1-2 parts of longan, 1.3-2.5 parts of red sage root and 1-3 parts of pumpkin. Nourishing-effect components of the puerpera nutritive meal comprise, by weight, 1-3 parts of motherwort, 2-3 parts of embryo cervi powder, 1.3-2.5 parts of safflower, 3-5 parts of pseudo-ginseng, 6-8 parts of sweet potato and 2-4 parts of cucumber. The puerpera nutritive meal contains scientific and reasonable nutrients, and realizes staged scientific adjustment matching of the nutrients according to different physiological and psychological demands of puerperae in different stages after delivery.

The invention discloses a dye coating device for spinning, and relates to the technical field of spinning. The dye coating device for spinning comprises a base, wherein a feeding roller, a coating boxand a material collecting roller are sequentially fixedly arranged on the base; non-woven fabric wound on the feeding roller passes through the coating box and is connected to the material collectingroller; a printing and dyeing assembly, a stirring assembly and a drying assembly are arranged in the coating box; the stirring assembly is arranged in the printing and dyeing assembly; the drying assembly is arranged at the right upper side of the printing and dyeing assembly; and an auxiliary assembly and a uniform-coating assembly are further arranged in the coating box. The stirring assemblyarranged in the printing and dyeing assembly can achieve effective stirring effect, so that color is conveniently regulated, and dyeing effect is further favorably improved, and therefore, practicability is high; and an auxiliary assembly can be arranged to improve integral functionality, so that recycling of dyes and drying of non-woven fabric are facilitated.

The invention discloses a method for extracting chlorophyll and aromatic oil from leaves of Zanthoxylum bungeanum. The method comprises the following steps: picking fresh leaves of Zanthoxylum bungeanum; grinding the leaves into slurry; filtering the slurry to respectively obtain a first filtrate and first filter dregs; adding ethanol into the first filter dregs, then performing filtration to obtain a second filtrate and second filter dregs; mixing the first filtrate and the second filtrate to obtain a mixed filtrate; adsorbing chlorophyll in the mixed filtrate by utilizing an adsorption column, with the mixed filtrate adsorbed by the adsorption column being Zanthoxylum bungeanum leaf juice, and eluting the adsorption column to extract the chlorophyll; distilling the Zanthoxylum bungeanumleaf juice to obtain an oil-water mixture; storing the oil-water mixture in a sealedpool, and uniformly and continuously injecting air into the sealed pool; transferring the sealed oil-water mixture into an oil-water separator, and obtaining aromatic oil in a high-speed centrifugal state; and adding an acetone-ethanol mixed solution into the second filter dregs, uniformly stirring the mixture, filtering the mixture to obtain a filtrate, and concentrating the filtrate to recover acetone and ethanol and to obtain chlorophyll. The use amount of the organic solvent is reduced.

The invention provides a self-repairing and recoverable polyimide insulating film as well as a preparation method and application thereof, and belongs to the technical field of insulating films. Comprising the following steps: S1, carrying out first polymerization reaction on an amino monomer and 4, 4 '-(4, 4'-isopropyl diphenoxy) bis (phthalic anhydride) to obtain an amino-terminated copolymerized polyamide acid solution; the amino monomer comprises 1, 4-bis (4-amino-2-trifluoromethyl phenoxy) benzene and / or 9, 9-bis (3-fluoro-4-aminophenyl) fluorene, and the amino monomer comprises 1, 4-bis (4-amino-2-trifluoromethyl phenoxy) benzene and / or 9, 9-bis (3-fluoro-4-aminophenyl) fluorene; s2, carrying out azeotropic water removal treatment on the copolymerized polyamide acid solution and an organic solvent to obtain polyimide powder; s3, carrying out a second polymerization reaction with a tri-aldehyde group cross-linking agent; and S4, carrying out a thermal cross-linking reaction at the temperature of 250-300 DEG C. The film disclosed by the invention can be recycled and repaired for multiple times, and has the advantages of low dielectric constant, good mechanical property, high thermal stability, high insulation characteristic and excellent insulation property recovery capability.

The invention discloses a puerpera recovery adjustment nourishing meal. The puerpera recovery adjustment nourishing meal is designed according to special physiological and psychological characteristics of puerperae just after delivery and is a systematized three-month adjustment nourishing meal realizing expelling, adjustment and nourishing. Expelling-effect components of the puerpera recovery adjustment nourishing meal comprise, by weight, 40-50 parts of pawpaw, 42-55 parts of Chinese yam, 23-35 parts of peach seed, 35-45 parts of baked ginger, 50-65 parts of licorice root and 600-630 parts of glutinous rice. Adjustment-effect components of the puerpera recovery adjustment nourishing meal comprise, by weight, 55-65 parts of pawpaw, 56-68 parts of longan, 20-30 parts of fingered citron, 58-65 parts of Chinese-date, 20-33 parts of peach seed and 580-620 parts of sweet potato. Nourishing-effect components of the puerpera recovery adjustment nourishing meal comprise, by weight, 55-70 parts of ginseng, 40-55 parts of lotus seed, 36-42 parts of spine date seed, 56-63 parts of mulberry and 560-610 parts of coix seed. The puerpera recovery adjustment nourishing meal contains scientific and reasonable nutrients, and realizes staged scientific adjustment matching of the nutrients according to different physiological and psychological demands of puerperae in different stages after delivery.

The invention relates to a hand-operated water sieve for SiC abrasive material. The hand-operated water sieve comprises a bottom plate, a supporting plate is arranged at the upper end of the bottom plate, a rotating shaft is arranged on the supporting plate, the right end of the rotating shaft is connected to a special-shaped arm, the right end of the special-shaped arm is connected to a first universal joint, the right end of the first universal joint is connected to a second universal joint, the right end of the second universal joint is connected to a swing arm, the right end of the swing arm is connected to a swing rod, the right end of the swing rod is connected to a limiting guide rod, the right end of the limiting guide rod is connected to an ear, the ear is welded to a pushing plate, and a screen is fixedly connected to the upper end of the pushing plate. According to the sieve, by arranging the swing arm with the second universal joint, shock excitation of the swing arm can be promoted, and shifting of the swing arm can be adjusted easily; by arranging the special-shaped arm, eccentric transmission of the rotating shaft force can be promoted; by arranging the limiting guide rod, the screen can be located easily. In addition, the hand-operated water sieve has the advantages of being simple in structure, convenient to operate, economical and practical.

The invention provides an intelligent garbage sorting system. The intelligent garbage sorting system comprises a base, a box body, a control cabinet, a garbage classification cabinet, a grabbing and classifying device, an image collecting device, a feeding port and a garbage recognition and classification module, wherein the box body is arranged on the base, the control cabinet is arranged on one side in the box body, the garbage classification cabinet is arranged in the box body and adjacent to the control cabinet, the grabbing and classifying device is arranged at the upper part of the garbage classification cabinet in the box body, the image collecting device is arranged below the grabbing and classifying device, the feeding port is formed in the top of the box body, and the garbage recognition and classification module is used for recognizing garbage. According to the intelligent garbage sorting system, the image collection device is arranged below the grabbing and classifying device, an image of the garbage is collected when the garbage is grabbed, and the image is transmitted to the garbage recognition and classification module through a controller to be recognized; and meanwhile, according to garbage information fed back by the garbage recognition and classification module, the controller controls the grabbing and classifying device to grab and move the garbage into sub garbage cans of the corresponding types, so that the garbage is classified and treated, the sorting precision is improved, the labor amount of garbage classification is reduced, the pollution of the garbage to the environment is reduced, and meanwhile, the recycling and cyclic utilization of resources are facilitated.

The invention belongs to the technical field of water pollution control in environmental protection and relates to wastewater treatment in the printing and dyeing process, in particular to a method and a device for separately treating alkali-decrement wastewater according to the quality. The method comprises the steps as follows: 1) electrodialysis of concentrated alkali-decrement alkaline water for liquid alkali recovery: concentrated alkali-decrement alkaline water is collectively collected and pumped into an electrodialysis device, and separated regenerated alkaline water is supplemented with sodium hydroxide and reused in an alkali-decrement production link; 2) acidification and filter pressing of alkali-decrement washing wastewater and diluted electrodialysis alkaline water for separation of terephthalic acid; 3) filtrate neutralization: filtrate is neutralized until the pH ranges from 6 to 8.4 with an electrodialysis regenerated alkali liquid; 4) degradation of remaining organic matter with a biological method. According to the developed technology for separately treating alkali decrement wastewater according to the quality, alkali and terephthalic acid in the alkali-decrement production wastewater are recovered step by step, the dosage of acid and alkali is reduced, the impact of the alkali-decrement production wastewater on a biological system is reduced, and the method has the advantages that energy consumption is low, the dosage of agents is small and the like.

The invention provides a tailing pre-discarding method for andalusite ore separation. The tailing pre-discarding method comprises the following steps: 1) andalusite crude ores are crushed until the particle sizes are not more than 20 mm; 2) the crushed raw materials are burned in a high-temperature furnace at the burning temperature of 700-900 DEG for 10-20 minutes, and then the crushed materials are cooled to room temperature in a cooling bed; and 3) the cooled materials are subjected to dry process selective ore grinding, ore grinding products are subjected to dry process grading so as to remove tailing discarding materials, and the residual materials enters into the sequent ore separation work to carry out separation and purification. According to the invention, some gangue minerals are removed by tailing discarding before separation, so that water resources are saved, the sequent separation efficiency is improved, and the ore separation cost is reduced.

The invention discloses a household domestic garbage smashing treatment device which comprises a shell. A ring-shaped lining plate, a sliding inner shell, a fixed blade, a smashing rotating shaft anda material guide bottom plate are arranged in the shell. A sliding feeding port is formed in the upper end of the sliding inner shell in an integral forming manner. An upper cover is arranged at the upper end of the sliding feeding port. Rotating screen plates are arranged on the two sides of the ring-shaped lining plate. Pushing rods and rolling wheels are arranged at the lower end of the slidinginner shell. A rotating blade and a rotating bearing are arranged on the periphery of the smashing rotating shaft. A motor and a supporting bottom rod are arranged at the lower end of the shell. Theleft wall of the shell is provided with a discharging port, a discharging pipe and a filtering cover. The inner wall of the right side of the shell is provided with an air injection pipeline and an air pump. The lower end of the supporting bottom rod is provided with a blind hole, a sliding bottom rod, a pad, a ring-shaped sliding sleeve and a corrugated pipe. The household domestic garbage smashing treatment device can collect sewage, efficiently smash materials and collect the materials, the materials are processed only by pressing when being needed, use is convenient, and supporting is stable.

The invention discloses a bulk cement storage and recovery silo. The silo comprises a silo body, an exhaust hole is formed in the top of the silo body, a discharging opening is formed in the bottom of the silo body, the discharging opening is connected into a transfer tank, the exhaust hole communicates with an exhaust pressurization mechanism through an exhaust pipeline, and an outlet of the exhaust pressurization mechanism extends into the transfer tank; the exhaust pressurizing mechanism comprises an exhaust pump and a filter box, an air inlet of the exhaust pump communicates with the exhaust pipeline, an outlet of the exhaust pump communicates with the filter box, and one end of the filter box communicates with the transfer tank. When filling is conducted on the silo body, air in the silo body is continuously extracted through the exhaust pressurizing mechanism and pressurized to be injected into the transfer tank, bulk cement in the transfer tank can enter the silo body from the discharging opening, dust generated in the silo body is mixed with the air and then enters the filter box through the exhaust pump to be filtered, and fine particles are discharged into the transfer tank again to be settled until the cement is completely injected into the silo.

The invention discloses a preparation method of a photoelectric component, which includes the steps of: a) forming a high-molecular layer on a base material, wherein the photoelectric component mainlyincludes a material which is degraded under light radiation; b) forming a photoelectric component above the photoelectric component; c) irradiating the high-molecular layer to degrade the high-molecular layer and separate the base material from the photoelectric component; d) using a cleaning composition to clean the base material or the photoelectric component, wherein the cleaning composition includes chain carbonate represented as the formula (1), and an organic solvent of which Hansen dissolubility parameter range is 9-15 (cal / cm<3>)1 / 2. The preparation method includes the step of cleaning the composition so that the high-molecular layer does not remain on the base material or the photoelectric component, and the base material is easy to recycle.

The invention discloses an active card communication system and method based on working clock calibration. The active card communication system comprises card reading equipment and an active card, wherein the card reading equipment and the active card establish communication wirelessly. An equipment counter is arranged inside the card reading equipment in a built-in mode. A clock calibration module and a card counter are arranged in the active card in a built-in manner. The clock calibration module is used for determining whether a counting value of the equipment counter is equal to a counting value of the card counter after communication establishment between the card reading equipment and the active card; if so, a work clock calibration course is completed; and if not, the counting value of the equipment counter is written into the card counter and thus working clocks of the card reading equipment and the active card are synchronized and then the working clock calibration course is completed. Therefore, the communication success rate can be improved; the service life of the active card can be prolonged; and the active card can be maintained, upgraded, and recycled conveniently.

The invention discloses a method for extracting chlorophyll and aromatic oil from Zanthoxylum bungeanum leaves, which comprises the following steps: obtaining fresh Zanthoxylum bungeanum leaves and grinding them into a slurry; filtering the slurry to obtain a first filtrate and a first filter residue respectively; adding ethanol to the first filter residue and filtering to obtain respectively The second filtrate, the second filter residue, the first filtrate, and the second filtrate are mixed to obtain a mixed filtrate: the chlorophyll in the mixed filtrate is adsorbed by an adsorption column, and the mixed filtrate after adsorption by the adsorption column is Zanthoxylum bungeanum leaf juice, and the adsorption column is eluted and extracted Chlorophyll; distill the juice of pepper leaves to obtain an oil-water mixture; store the oil-water mixture in a sealed pool, and inject air evenly and continuously into the sealed pool; transfer the sealed oil-water mixture into an oil-water separator, and obtain aromatic oil under high-speed centrifugation ; Add acetone and ethanol mixture to the second filter residue, stir evenly, filter to obtain the filtrate, concentrate the filtrate and recover acetone and ethanol to obtain chlorophyll. The invention reduces the usage amount of the organic solvent.

The invention relates to the field of chemical synthesis processes, in particular to a high-purity trioxymethylene refining system and process. The system comprises a gas-liquid extraction tower and a benzene recovery tower; a water washing tower is arranged between the gas-liquid extraction tower and the benzene recovery tower; and trioxymethylene crude gas firstly enters the gas-liquid extraction tower to be extracted with benzene, a solution at the tower bottom enters the water washing tower to be washed, overflow liquid at the tower top of the water washing tower enters the benzene recovery tower for benzene separation, and refined high-purity trioxymethylene is obtained. According to the process, the problems of high formic acid content, high water content and the like in the trioxymethylene component can be solved, the trioxymethylene content is increased to 99.9%, and a high-quality comonomer is provided for polymerization reaction.

The invention relates carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with a Pizza structure as well as a preparation method and application of the CNNS composite pH-sensitive hydrogel. Acrylic acid solution is irradiated by ultraviolet under a certain condition to be directly polymerized into a polyacrylic acid (PAA) film, a certain mass of CNNS is deposed on the PAA film as a substrate, then, CNNS / PAA and an acrylamide solution are irradiated by an xenon lamp under filtering by a 420 nm optical filter, and the CNNS can initiate the acrylamide to be polymerized on the CNNS / PAAto produce Pizza CNNS composite hydrogel with an interpenetrating network structure. The prepared PAM / CNNS / PAA with the interpenetrating network structure is found to have substantially improved tensile strength as compared with PAA, besides, the film form structure of the PAM / CNNS / PAA composite hydrogel is different agglomeration hydrogel structures of common organic polymeric materials and photocatalytic materials, the adsorption function of PAM and the photodegradation function of the CNNS and PAA can cooperate in printing and dyeing wastewater treatment, and meanwhile, the problem of difficulty in recovering multiple photocatalysts.

The invention belongs to the technical field of water pollution control in environmental protection and relates to wastewater treatment in the printing and dyeing process, in particular to a method and a device for separately treating alkali-decrement wastewater according to the quality. The method comprises the steps as follows: 1) electrodialysis of concentrated alkali-decrement alkaline water for liquid alkali recovery: concentrated alkali-decrement alkaline water is collectively collected and pumped into an electrodialysis device, and separated regenerated alkaline water is supplemented with sodium hydroxide and reused in an alkali-decrement production link; 2) acidification and filter pressing of alkali-decrement washing wastewater and diluted electrodialysis alkaline water for separation of terephthalic acid; 3) filtrate neutralization: filtrate is neutralized until the pH ranges from 6 to 8.4 with an electrodialysis regenerated alkali liquid; 4) degradation of remaining organic matter with a biological method. According to the developed technology for separately treating alkali decrement wastewater according to the quality, alkali and terephthalic acid in the alkali-decrement production wastewater are recovered step by step, the dosage of acid and alkali is reduced, the impact of the alkali-decrement production wastewater on a biological system is reduced, and the method has the advantages that energy consumption is low, the dosage of agents is small and the like.