316 results about "Reduction treatment" patented technology

This invention belongs to the field of catalytic material preparation technology, specifically relating to a method for preparing high specific surface area pure phase α-type molybdenum carbide by hydrogen intercalation modification of MoO3 and its application, including the following steps: (1) adding MoO3 powder to hydrochloric acid and dispersing it to prepare a mixture of MoO3 and hydrochloric acid; (2) adding metal powder to the mixture in step (1) and performing pre-reduction treatment by in-situ hydrogenation of the metal and hydrochloric acid to prepare H x MoO3 precursor; (3) H prepared in step (2) x The MoO3 precursor is carbonized under a carbon source gas to obtain a pure α-type molybdenum carbide with a high specific surface area. This method is simple and effective, avoids the use of corrosive NH3 gas during carbonization, and does not require a metal as a medium, thus solving the current problem of not being able to prepare metal-free modified pure α-MoC in one step.

The invention discloses a graphene-organic silicon core-shell defoaming agent and a preparation method thereof.The defoaming agent is of a core-shell structure with graphene as a core and organic silicon as a shell, and the graphene and the organic silicon have a synergistic effect, so that the defoaming agent is good in monodispersity and can stably play a defoaming role at the high temperature. Preparing a graphene oxide dispersion liquid; meanwhile, a PDMS prepolymer is prepared, and the graphene oxide dispersion liquid is dropwise added into a PDMS prepolymer system, so that the organic silicon monomer is subjected to graft polymerization reaction on the surface of the graphene oxide. And then carrying out reduction treatment on the reaction product to convert the graphene oxide into reduced graphene oxide to form a core-shell structure, and carrying out centrifugal separation, washing and vacuum drying to obtain the graphene-organic silicon core-shell defoaming agent. The problems that an existing defoaming agent is poor in dispersity, weak in interface bonding force and insufficient in high temperature resistance in the high polymer material forming process are solved, and the defoaming efficiency and the product quality are improved.

The invention provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The utility model discloses a reduction treatment system for oily sludge, and relates to the technical field of oily sludge treatment, an outlet of a feeding module is connected with an inlet of a conditioning module through a pipeline, and an outlet of the conditioning module is respectively connected with an inlet of a liquid-liquid separation module and an inlet of a solid-liquid separation module through pipelines; the liquid-liquid separation module adopts centrifugal separation, a residue water pump outlet of the liquid-liquid separation module is connected with an inlet of the solid-liquid separation module through a pipeline, an oil residue outlet of the liquid-liquid separation module is connected with an inlet of the conditioning module and the outside through pipelines, and a water pump outlet of the solid-liquid separation module is connected with the inlet of the conditioning module and the outside through pipelines. An oil pump outlet of the solid-liquid separation module is respectively connected with an inlet of the tempering module and the outside through pipelines, a solid phase outlet of the solid-liquid separation module is connected with the outside through pipelines, and valves are arranged on the pipelines. According to the utility model, the recycled oil does not contain a flocculating agent component, so that the equipment is not influenced during recycling.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

The present invention provides a Fenton iron sludge treatment method and device, comprising the following steps: allowing the Fenton iron sludge to enter an iron reduction unit, undergoing reduction treatment under the action of dissimilatory iron-reducing bacteria, reducing the trivalent iron in the Fenton iron sludge to divalent iron through the reduction treatment to obtain reduced iron sludge; allowing at least a portion of the reduced iron sludge to enter a bioleaching unit, undergoing bioleaching treatment under the action of specific microorganisms to obtain a first mixed liquid; dehydrating the first mixed liquid to obtain an aqueous phase and dehydrated sludge, respectively; and returning the aqueous phase to the bioleaching system to participate in the bioleaching treatment. The present invention can solve technical problems existing in the prior art, such as the need for additional acid, the generation of a large amount of strongly acidic water, the susceptibility to environmental pollution, the inability to recycle iron, and high costs.

The invention discloses a preparation method of a bifunctional catalyst, the bifunctional catalyst and application, the preparation method comprises the following steps: (1) soaking an acidic functional component with an organic matter solution to obtain an acidic functional component precursor; (2) carrying out pre-reduction treatment on the dehydrogenation hydrogenation functional component to obtain a pretreated dehydrogenation hydrogenation functional component; and (3) kneading, molding, drying and roasting a mixture containing the acidic functional component precursor, the pretreated dehydrogenation and hydrogenation functional component, an auxiliary agent and a binder to obtain the bifunctional catalyst. The bifunctional catalyst disclosed by the invention has the characteristics of high conversion rate, good selectivity and excellent regeneration performance.

The invention discloses a multi-stage cooperative processing technology for a tinned pin oxide layer of a plastic package device, and belongs to the technical field of electronic component packaging. The process comprises the following steps of: (1) low-temperature plasma pretreatment: under a vacuum condition, adopting mixed gas of argon and nitrogen, and generating plasma through a radio frequency power supply to carry out irradiation treatment on the surface of a pin; (2) composite reduction treatment: soaking the device in a citric acid-ascorbic acid composite solution with the pH value of 2.8-3.5; and (3) molecular self-assembly protection: carrying out surface coating by adopting an ethanol solution of gamma-aminopropyltriethoxysilane, and curing to form an anti-oxidation protection layer. According to the method, effective removal and protection reconstruction of the oxide layer are achieved through a three-stage cooperative processing mechanism, the pin welding qualification rate can be increased to 98.5% or above, and the temperature in the processing process is always lower than the glass-transition temperature of a plastic packaging material.

The invention provides a reverse osmosis reducing agent and a preparation method and application thereof, and belongs to the technical field of reverse osmosis water treatment.The reverse osmosis reducing agent comprises a first reducing agent, a second reducing agent and a solvent; the first reducing agent is thiosulfate, and the second reducing agent is sulfite and / or bisulfite; the mass ratio of the first reducing agent to the second reducing agent is (1: 18)-(10: 1). The reverse osmosis reducing agent can be applied to reverse osmosis water treatment, the reverse osmosis reducing agent is added into reverse osmosis inlet water to be treated, and the reverse osmosis inlet water subjected to reduction treatment can be obtained after full reaction. The first reducing agent and the second reducing agent are compounded according to the specific mass ratio, so that the compounded reverse osmosis reducing agent can effectively inhibit the occurrence of advanced oxidation chain reaction while keeping high reducibility, and effective reduction of reverse osmosis inlet water can be realized by using a small amount of the reverse osmosis reducing agent.

This method for treating a paper diaper involves: a step for crushing a used paper diaper and washing same; and a pulp content reduction treatment step for reducing the pulp content ratio of a pulp-containing plastic fraction produced in the previous step by fracturing treatment and sorting treatment. The sorting treatment is performed by wind power sorting treatment, sieving sorting treatment, wet specific gravity sorting treatment, or the like.

The embodiment of the invention belongs to the technical field of electrochemical gas sensors, and relates to a preparation method of a counter electrode of an NO sensor, which comprises the following steps: adding a polymer adhesive into an organic solvent to prepare a polymer adhesive mother solution; mixing manganese dioxide powder with the polymer adhesive mother liquor, and stirring to form uniform slurry; coating a substrate with the slurry, and performing drying treatment to form a counter electrode plate; and putting the counter electrode plate into an environment with reducing gas or inert gas to carry out high-temperature reduction treatment so as to improve the oxygen vacancy concentration, thereby obtaining the counter electrode of the NO sensor. The invention further provides an NO sensor and an NO detection method. The counter electrode of the NO sensor and the NO sensor prepared by the embodiment of the invention have the advantages of low cost and high anti-interference capability while keeping high oxygen reduction catalytic activity, and are particularly suitable for high-selectivity and high-sensitivity detection of NO gas in the fields of environmental monitoring, medical diagnosis and the like.

The application relates to a method for improving a tungsten-copper connecting interface based on internal oxidation and hydrogen reduction process, and relates to the technical field of tungsten-copper composite material preparation. First, an oxide (Cu2O, CuO) or oxygen is added to the surface of a tungsten block for internal oxidation treatment, a nano-oxide porous structure is generated on the surface, the surface roughness is increased, then hydrogen reduction is performed to remove surface oxide impurities, the surface pores are reserved, finally, the tungsten block with the treated surface is combined with copper powder through discharge plasma sintering to realize effective combination between tungsten and copper. Through the internal oxidation process, the influence of a metal alloy layer formed by a heterogeneous element brazing filler on the tungsten-copper interface compatibility and stability under radiation can be effectively avoided, and through the reduction treatment of high-purity hydrogen, the high-purity of the matrix is maintained, and the combination performance of the porous structure reinforced connecting layer is generated.

The utility model discloses a sludge reduction treatment system based on A2O process, which comprises an A2O tank, a secondary sedimentation tank, a sludge pump tank, a bacteria culture tank and a sludge storage tank, an outlet of the A2O tank is connected with the secondary sedimentation tank, an outlet of the secondary sedimentation tank is connected with the sludge pump tank, one outlet of the sludge pump tank is connected with the sludge storage tank, the other outlet is divided into two pipelines, one pipeline is in reflux connection with an anaerobic zone of the A2O tank, and the other pipeline is in reflux connection with a bacteria culture tank. The other pipeline is connected with a bacterium cultivation pool, and an outlet of the bacterium cultivation pool is connected with the aerobic zone of the A2O pool. Through the optimization and improvement of the A2O biochemical process system, the sludge is treated by the biological enhancement reactor, so that the generation of residual sludge is reduced from the source on the premise of keeping the biochemical treatment effect of the sludge unchanged, and the subsequent sludge dewatering, transportation and terminal treatment costs are greatly reduced.

The invention relates to the technical field of spinal fracture treatment, in particular to a spinal fracture controllable expansion reset device which comprises a first insertion screw rod, a first locking bolt is arranged in the first insertion screw rod, and a middle connecting piece is arranged at the top of the first insertion screw rod. According to the spinal fracture controllable expanding and resetting device, by arranging the adjusting and locking assembly, a first insertion screw rod is screwed into the spine, then a second insertion screw rod can be pushed to rotate around a rotating shaft rod, and the angle of the second insertion screw rod needs to be adjusted according to a pointer and a scale ring plate when the second insertion screw rod is arranged at the initial position; the second insertion screw rod is inserted into the vertebral column, it is ensured that the second insertion screw rod is aligned with the bent vertebral column when placed into the vertebral column, after the second insertion screw rod is adjusted to the vertical direction, a locking screw rod and a nut need to be used for locking, and therefore the angle of the second insertion screw rod is locked, centrum reduction treatment is completed, spine fracture distraction reduction can be achieved in a posterior operation, the reduction effect is excellent, and practicability is high.

The invention discloses a pretreatment method for recycling phosphorus in sludge, which is characterized in that the sludge is subjected to reduction treatment by adopting aerobic biological decomposition drying, phosphorus is screened and fixed, and then phosphorus is recycled through pickling, the pretreatment method for recycling phosphorus in sludge is provided, the method is simple to operate, the cost is low, and the method is suitable for industrial production. The sludge is subjected to reduction treatment, resource recovery of phosphorus in the sludge is realized, and the problem of environmental pollution caused by loss of phosphorus in wastewater is prevented.

The invention relates to a method for preparing a carbon nanotube by using a fixed bed. The method comprises the following steps: step 1, preparing a molecular sieve loaded FeCo bimetallic catalyst as a catalyst precursor; 2, placing the catalyst precursor in a fixed bed reaction furnace chamber, purging with Ar gas, and heating to 550 DEG C; 3, H2 is introduced into the environment with the temperature of 550 DEG C for reduction treatment, and then the temperature continues to rise to 600 DEG C in the Ar atmosphere; and 4, switching to introduce CO gas as a carbon source for reaction, and cooling to room temperature under the protection of Ar after the reaction is finished, thereby finishing the preparation of the carbon nanotube. By adopting the method, the activity and selectivity of the catalyst reach the optimal synergistic effect by regulating and controlling catalyst components, carrier properties, growth conditions and the like, and compared with the prior art and commercial SG65i carbon tubes, the single-walled carbon nanotubes (SWCNTs) prepared by adopting the method have the advantages that the difficulty in the aspect of (6, 5) chiral structure control is obviously reduced, and the purity is higher.

The invention belongs to the field of comprehensive treatment of oily sludge, and relates to a reduction treatment method of oily sludge. Comprising the following steps: step 1, mixing a first part of oily sludge to be treated with an organic loose material, inoculating a thermophilic compound bacteria solution into the mixture, feeding the mixture into a high-temperature microbiological treatment unit, introducing air, stirring and heating to a target fermentation temperature, and maintaining the target fermentation temperature; step 2, gradually adding a second part of to-be-treated oily sludge into the high-temperature microbiological treatment unit under heating and stirring conditions, and carrying out a first high-temperature aerobic fermentation reaction to obtain a high-temperature aerobic fermentation material; step 3, outputting a part of the material subjected to high-temperature aerobic fermentation, continuously adding a third part of oily sludge to be treated into the high-temperature microbiological treatment unit, and carrying out high-temperature aerobic fermentation reaction again; and step 4, repeating the step 3 until the reduction treatment of the oily sludge is completed. Compared with the prior art, the biological treatment method is lower in cost and higher in decrement rate.

The utility model discloses underwater deposited sludge reduction treatment equipment which comprises an aeration device and a supporting device, the aeration device comprises a submersible pump, a micropore aeration head connected with a water outlet pipe of the submersible pump and an air inlet pipe communicated with the micropore aeration head, and the upper end of the air inlet pipe is located above the water surface; the supporting device comprises a bottom plate and a supporting frame located on the upper portion of the bottom plate, and an inner tetrahedral cone composed of four slopes is arranged in the middle of the supporting frame. The lower part of the submersible pump is provided with a movable support, the movable support comprises a mounting plate, and the lower part of the mounting plate is provided with an outer four-side cone consisting of four inclined planes; the outer tetrahedral cone of the movable support is installed in the inner tetrahedral cone of the supporting device in a matched mode. According to the utility model, the modes of mobile aeration and medicament feeding are adopted, so that bio-enzyme can be in direct contact with sludge deposited at the bottom of an activated riverbed, the effect of rapid decomposition can be achieved along with the great increase of dissolved oxygen in an aeration state, and the efficiency of sludge reduction treatment is improved.

The application relates to the technical field of MOF-based catalysts, in particular to a noble metal MOF-based catalyst, a preparation method and application. The catalyst is prepared by the method. The method comprises the following steps: preparing a noble metal-ligand chelation solution; adding manganese salt, a second organic ligand, a second organic solvent and water into the noble metal-ligand chelation solution in sequence, adjusting the pH value to 3-5 after stirring and dissolving, and obtaining a precursor suspension; cooling the precursor suspension to room temperature after a crystallization reaction; then, performing suction filtration, and performing first washing treatment on the obtained solid until the washing liquid is colorless and transparent; performing first vacuum drying treatment on the obtained solid, and obtaining a precursor powder; and performing reduction treatment, second washing treatment and second vacuum drying treatment on the precursor powder in sequence, and obtaining the catalyst. The application is the application of the catalyst in adsorptive catalytic oxidation of formaldehyde, and the conversion rate of formaldehyde can be greater than or equal to 95% at room temperature.

The invention discloses thermocatalytic degradation equipment and method for reduction treatment of biochemical sludge. The equipment comprises an equipment base, a degradation barrel, a dehydration assembly and a pyrolysis assembly, the degradation cylinder is arranged on the equipment base, and a filter plate is arranged at the lower end of the degradation cylinder; the dehydration assembly comprises an extrusion disc clamped in the degradation barrel, a pushing frame clamped on the equipment base and connected with the extrusion disc, and a driving motor for providing power for the pushing frame; the pyrolysis assembly comprises a sliding heat insulation seat clamped in the extrusion disc, an electric heating rod arranged on the sliding heat insulation seat and a hydraulic oil cylinder for providing power for the heat insulation seat; the equipment disclosed by the invention is reasonable in structural design, the biochemical sludge is subjected to mechanical dehydration treatment before thermocatalytic degradation treatment, so that the volume of the biochemical sludge is effectively reduced, and the reduction treatment of the biochemical sludge is promoted; meanwhile, when the dewatered biochemical sludge is heated, the energy consumption of the equipment is lower, and the equipment is suitable for popularization and application.

Provided is a method for producing a catalyst that makes it easier to produce a supported metal catalyst for ammonia synthesis, which has limitations in production methods or production facilities, particularly, has large limitations in industrial-scale production, and that can produce the catalyst with high activity. This method for producing a catalyst for ammonia synthesis is characterized by comprising a first step for preparing 12CaO. 7Al2O3 having a specific surface area of 5 m2 / g or more, a second step for supporting a ruthenium compound on the 12CaO. 7Al2O3, and a third step for reducing the ruthenium compound-supported 12CaO. 7Al2O3 obtained in the second step. The reduction treatment is performed until the average particle diameter of the ruthenium after the reduction treatment is increased by at least 15% relative to the average particle diameter of the ruthenium before the reduction treatment.

The invention relates to the technical field of solid waste treatment, and discloses a sludge harmless and reduction treatment process which comprises a central control system, and a hydrolysis unit, an anaerobic reaction unit, a digestive juice temporary storage unit, a centrifugal dewatering unit, a sunlight drying unit and a sludge temporary storage and packaging unit which are sequentially connected in series. Marsh gas generated by the anaerobic reaction unit is purified and then enters the marsh gas utilization unit, and a heat energy recovery device configured in the marsh gas utilization unit conveys waste heat to the hydrolysis unit, the anaerobic reaction unit and the sunshine drying unit through a heat medium water circulation pipe network to form a heat circulation loop. The central control system is used for blending feeding based on a dry matter mass balance principle, controlling anaerobic temperature by utilizing cascade feedforward logic, and adjusting drying ventilation according to an indoor and outdoor absolute moisture content difference value. The energy self-sufficiency rate and the operation stability of sludge treatment are improved by constructing a closed-loop system for material conveying and energy recovery and combining a multi-parameter coupling control strategy.

The application relates to the technical field of organic synthesis, in particular to a catalyst, a preparation method thereof and a preparation method of methyl glycolate. The preparation method of the catalyst comprises the following steps: loading a copper salt and a silver salt on a carrier to obtain a catalyst precursor, wherein the material of the carrier comprises silicon dioxide; performing electromagnetic radiation treatment on the catalyst precursor to obtain a modified catalyst precursor; and performing reduction treatment on the modified catalyst precursor, so that the copper salt loaded on the carrier is reduced into elemental copper, and the silver salt loaded on the carrier is reduced into elemental silver. The preparation method can improve the DMO conversion rate and the MG selectivity.

The invention discloses an electroplating sludge reduction treatment device. The treatment device comprises an outer box body, a drying mechanism and a synergistic mechanism, the drying mechanism comprises a conveying part and a drying part, the conveying part is arranged in the outer box body, and the air exhaust position of the drying part is located under the conveying part; the efficiency increasing mechanism comprises a lifting assembly and a knocking assembly; wherein the lifting assembly is arranged on the inner side of the conveying part, and the lifting assembly swings under the rotation of the conveying part; the knocking assembly is located above the portion, conveying the mud strips, of the conveying part, the knocking assembly does vertical lifting reciprocating motion under swinging of the lifting assembly, and the knocking assembly is provided with at least two alternate knocking point positions. In the invention, the lifting assembly is designed, and the lifting assembly can enable the conveying mesh belt to generate periodic horizontal micro-amplitude vibration, so that not only can wet sludge be effectively prevented from being adhered to the mesh belt, but also upper-layer sludge strips can tend to be loosely arranged and be lifted by vibration.

A kind of low concentration chromium-containing leather wastewater treatment method, comprising the following steps: step one, after adjusting leather wastewater, send into membrane separator and obtain concentrated solution and waste liquid;Step two, send waste liquid into resin adsorption tank, and carry out adsorption recovery to chromium ion;Step three, send concentrated solution into hydrolysis fermentation tank and carry out hydrolysis fermentation;Then send into anaerobic tower and carry out further decomposition;Step four, send concentrated solution of step three into multi-medium filter and treat, the supernatant obtained is sent into resin adsorption tank;The waste of backwashing multi-medium filter is transported to adjusting tank and is treated again;Step five, the wastewater treated after resin adsorption tank is treated biochemically;Step six, resin adsorption tank is treated by desorption, then the pH of desorption waste liquid is adjusted, so that chromium ion is precipitated to obtain chromium precipitation recovery;The present application not only recycles chromium ion in leather wastewater, but also can carry out reduction treatment to leather waste in leather wastewater, reduce the pollution to environment.

The present invention proposes a method for manufacturing a TbDFe supermagnetic alloy based on stereolithography. The method first prepares a stereolithography slurry using a photosensitive resin as a matrix. A metal-organic chelating agent containing TbDFe supermagnetic alloy components is added to enhance the uniform distribution of the metal powder, ensuring printing accuracy and material stability. Next, degreasing is performed to remove the resin and chelating agent through heat treatment. The degreasing process is controlled by controlling the heating rate to avoid structural collapse. Decarburization is then performed in a low-oxygen atmosphere to improve the purity of the alloy and ensure structural integrity before sintering. A reduction treatment is then performed to improve structural stability and purity. Finally, high-temperature sintering is performed under the assistance of a magnetic field to optimize grain orientation and magnetic domain arrangement, thereby enhancing the magnetostrictive effect and force-to-magnetic energy conversion efficiency. This method combines stereolithography with magnetic field-assisted heat treatment, effectively avoiding the risk of structural damage during the printing of TbDFe supermagnetic alloy.

The utility model discloses a sludge reduction treatment system based on CASS process, which comprises a pretreatment unit, a CASS biochemical reaction unit, an effluent disinfection unit, a BSR reaction unit, a temporary bacteria culture unit and a sludge storage unit, the pretreatment unit is connected with the CASS biochemical reaction unit, the CASS biochemical reaction unit is communicated with the BSR reaction unit through a pipeline to form internal circulation, and the temporary bacteria culture unit is connected with the sludge storage unit. The temporary bacteria culture unit is communicated with the BSR reaction unit through a pipeline to form internal circulation, the CASS biochemical reaction unit is circularly connected with the temporary bacteria culture unit through a pipeline, the water outlet end of the CASS biochemical reaction unit is connected to the effluent disinfection unit, and the sludge outlet end of the CASS biochemical reaction unit is connected to the sludge storage unit. According to the utility model, the activated sludge treated by the BSR reaction unit in the temporary culture unit can be used as a strain culture medium without additionally supplementing nutrients, so that the biodegradability of microorganism remains is improved and the stable operation of a sewage treatment system is ensured on the premise of keeping the biochemical treatment effect of sewage unchanged.