78results about How to "Increase return flow" patented technology

The invention relates to a continuous preparation process for an environment-friendly plasticizer and a device used in the process. The process comprises the following steps of: enabling solid terephthalic acid and isooctyl alcohol which serve as raw materials to react in the existence of an esterification catalyst and an antioxidant for continuously preparing dioctyl terephthalate (DOTP); pulpifying the solid terephthalic acid in the isooctyl alcohol until the particle size of the solid terephthalic acid reaches 5 to 20 mu m; adding the isooctyl alcohol so as to adjust the mole ratio of alcohol to acid in pulp liquid as 2:1 to 4:1; adding into a slurry tank, preheating, and entering a reaction kettle from the bottom; reacting with the preheated isooctyl alcohol which enters from the bottom of the reaction kettle in the reaction kettle in the existence of the esterification catalyst and / or the antioxidant; reacting until an acid value decreases to be below 2, and continuously feeding the raw materials namely the solid terephthalic acid and the isooctyl alcohol; and adding the DOTP which is generated in reaction from the upper part of the reaction kettle to a product tank, condensing the isooctyl alcohol which does not completely reacts and the generated steam through a condenser on the top of the reaction kettle, separating through an oil water separator, and entering an octyl alcohol tank for recirculation.

A concentrated slurry and dual-alkali process for desulfurizing, dusting and reclaming fume includes such steps as removing SO2 and dust from fume by the desulfurizing liquid, exhausting clean fume, returning part of resultant liquid base to desulfurizing liquid, pumping its rest in crystallizer, crystallizing, flowing the most of slurry in regenerator while flowing the rest in deposition pool, taking the supernatant from deposition pool and delivering it to regenerator, discharging deposit, and adding lime / lime stone and sodium alkali to said slurry in regenerator for regeneration.

The invention belongs to the field of waste water treatment, and particularly relates to a method for treating waste water through a double catalytic oxidation process. A catalyst is added to the waste water for sodium hypochlorite catalytic oxidation, and then electrolytic catalysis is carried out. Gamma-Al2O3 is adopted as a carrier of the catalyst, and oxide loaded with one or more of Mn element, Cu element, Fe element, Co element, Ce element and K element is adopted as an active component of the catalyst. When the catalyst is added to the waste water for sodium hypochlorite catalytic oxidation, sodium hypochlorite is preferably added. Organic matter with weak oxidation resistance in the waste water is firstly subjected to catalytic oxidation decomposition through sodium hypochlorite, and organic matter with high oxidation resistance is subjected to electrolytic catalytic oxidation degradation later on. The organic matter in the waste water is treated in a classification mode through the double catalytic oxidation process, the hydraulic retention time is shortened, and treatment efficiency is improved. The invention further provides a device for achieving the method. The device is simple in structure and easy to implement.

A fluidized bed reactor for granulating and coating particles in very small amounts having an essentially conical product container, a filter housing with filters inserted above the product container, and a lower housing below the conical product container having a process air supply. The product container has a sieve bottom in the center of which is a height-adjustable two-component nozzle. At least one guide element associated with the sieve bottom directs at least part of the process air to the two-component nozzle in a radial manner.

The invention relates to a multi-tube-bundle jet-fluidized anti-scale shell and tube heat exchanger using sewage and refrigerant, belongs to the technical field of sewage heat exchange equipment, and solves the problems that the existing conventional shell and tube heat exchange has no functions of decontamination and scale prevention; during application of the chemical industry fluidized-bed heat exchanger in sewage, return of solid particles is unsmooth and reliable continuous descaling and heat exchange enhancement fail. Two ends of a shell are sealed through a solid-liquid separation end and a gland. A distribution plate is disposed in the shell. A cavity is enclosed by the solid-liquid separation end, the shell and the distribution plate. A heat exchange cavity is enclosed by the shell, the distribution plate and the gland. Heat exchange tube bundles are supported and fixed through the distribution plate and a plurality of baffles. The cavity is divided into a sewage inlet cavity and a solid-liquid separation cavity by a partition. Both the solid-liquid separation cavity and the sewage inlet cavity are filled with the sold particles. The upper end of the side wall of the shell is provided with a sewage outlet, a refrigerant inlet and a refrigerant outlet. An ejector is mounted at the lower end of the side wall of the shell. A solid-liquid return pipe is communicated with the solid-liquid separation cavity and the ejector. The multi-tube-bundle jet-fluidized anti-scale shell and tube heat exchanger using sewage and refrigerant is applicable to sewage heat exchange.

The present invention relates to an inner sole for a shoe, comprising a base body, a covering layer and several cushioned layers arranged on the surface of the sole. A first cushioned layer is provided in the ball area of the forefoot, a second cushioned layer is included in the transition area of the metatarsus and the tarsus and a third cushioned area is provided between the metatarsus and the heel. The cushioned layers are subdivided into individual, separate plateau-like fields which are located close to each other in the transversal direction of the sole surface. This provides an inner sole which brings about a substantial improvement in the transport of fluids in the venous and lymphatic vessel system in the legs during movement of the foot joints and ankle joints by means of synergistic support of the muscle structure.

The present invention relates to a constant water level sequencing batch type activated sludge treatment sewage system with a characteristic of multi-level A-O reinforced denitrogenation and phosphorus removing, and a method thereof. The system sequentially comprises an anaerobic cell, multiple stage anoxia-aerobic cells, and a facultative cell, wherein the rear of the facultative cell is dividedinto two branches, one branch is the first sequencing batch cell communicated with the first aerobic cell, and the other branch is the second sequencing batch cell communicated with the second aerobic cell. With the system of the present invention, the constant water level sequencing batch type activated sludge treatment sewage method is improved so as to enhance effects of denitrogenation and phosphorus removing.

The invention discloses a disposable circumcision anastomat and an auxiliary device for sheathing an annular elastic ring. The disposable circumcision anastomat comprises an inner ring and the annular elastic ring, wherein, the inner ring is provided with an upper end surface and a lower end surface, and the size of the annular elastic ring is matched with the inner ring. The supporting auxiliarydevice is a sleeve the size of which is matched with the annular elastic ring. The novel disposable circumcision anastomat provided by the invention has the advantages of novel structure, safety, sanitation and is convenient and comfortable to use; and the auxiliary device is used for sheathing and fastening the ring.

The invention provides an AAO-MBR sewage processing device and an optimization operation method. The device mainly comprises an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank, and the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are communicated with each other. The aerobic tank is composed of three galleries in series connection which are an aerobic tank c1, an aerobic tank c2 and an aerobic tank c3 in order. A first aeration system e1, a second aeration system e2 and a third aeration system e3 are arranged in the aerobic tank c1, the aerobic tank c2 and the aerobic tank c3 respectively and are connected with a blower through pipes and valves. Backflow systems are arranged between the membrane tank and the aerobic tank, between the aerobic tank and the anoxic tank and between the anoxic tank and the anaerobic tank respectively. The three galleries of the aerobic tank are subjected to interactive or alternative aeration on the premise that a lot of dissolved oxygen carried by backflow liquid in the membrane tank is fully utilized, operation energy consumption of an MBR technology is reduced, MBR technology energy saving consumption reduction optimization operation is achieved, and a nitrogen removal function of a traditional or present AAO-MBR technology is raised. The optimization operation method is suitable for optimization operation and control of various sewage processing technologies of an activated sludge process and MBR and has wide adaptability.

A fluidized bed reactor for granulating and coating particles in very small amounts having an essentially conical product container, a filter housing with filters inserted above the product container, and a lower housing below the conical product container having a process air supply. The product container has a sieve bottom in the center of which is a height-adjustable two-component nozzle. At least one guide element associated with the sieve bottom directs at least part of the process air to the two-component nozzle in a radial manner.

The invention discloses a sewage treatment control method and system for improving the treatment scale in situ, and belongs to the technical field of sewage treatment. The sewage treatment system comprises a pretreatment unit, an activated sludge treatment unit, a mixing unit, a secondary sedimentation unit and an advanced treatment unit which are sequentially communicated in the water flow direction. A dosing control unit is connected with the mixing unit; an online flow meter is used for detecting online inflow flow data of sewage in the pretreatment unit and sending the online inflow flow data to the dosing control unit; an online sludge concentration meter detects active sludge on-line concentration data MLSS of the active sludge unit and sends the active sludge on-line concentration data MLSS to the dosing control unit; and the dosing control unit determines the dosing amount of the medicament according to the online flow meter value and the online sludge concentration meter valueand adds the medicament to the mixing unit. The sewage treatment scale can be increased, and the problem of seasonal sewage overflow pollution can be solved.

The invention discloses a compound ethanol enzyme with acid proteases and a method for preparing the compound ethanol enzyme. The compound ethanol enzyme and the method have the advantages that the high-activity acid proteases and plant extract with abundant plant-based enzymes and nutrient substances are particularly compounded on the basis of scientific compound food-grade enzyme preparations, so that the compound ethanol enzyme is provided with complete enzyme systems; activators, protective agents and antioxidants are further added into the high-activity acid proteases and the plant extract, the enzyme activity can be completely released by the aid of the activators and can be stabilized by the aid of the protective agents and the antioxidants, and hops extract and novasil which are used for inhibiting bacteria contamination and promoting saccharification of leaven and quick proliferation and fermentation of saccharomyces cerevisiae are further scientifically compounded; starch, proteins, fat, cellulose, hemi-cellulose, pectin and the like in unprocessed grain can be sufficiently and effectively hydrolyzed, accordingly, the raw material utilization rate and the liquor yields can be effectively increased, and the alcohol contents can be increased by 13.63%, 36.25% and 17.44% respectively as compared with commercially available special compound ethanol enzymes; the liquor yields of raw materials can be respectively increased by 17.41%, 38.81% and 20.04%, and the ethanol production cost can be obviously reduced.

The invention relates to an artificial wetland sewage treatment system adopting rotational flow active sludge method pretreatment, which comprises a primary sedimentation tank, a venturi, a rotational flow active sludge pool, a secondary sedimentation tank and an artificial wetland, wherein a bar screen is positioned in the front of the primary sedimentation tank; the inlet of the gradually reducing part of the venturi is connected with the upper part of the primary sedimentation tank through a high-pressure pump, the throat part is connected with the atmosphere through an air inlet pipe, and the outlet of the gradually expanding part is provided with a jet pipe extending forwards; the jet pipe is tangentially connected with the lower part of the rotational flow active sludge pool, and the shape of the cross section of the rotational flow active sludge pool is round; the yielding water of the rotational flow active sludge pool is connected into the secondary sedimentation tank, and the yielding water of the secondary sedimentation tank is connected into the artificial wetland; and the artificial wetland adopts a horizontal baffling structure, and the water outlet is provided with a water storage tank. The artificial wetland sewage treatment system has the advantages of simple structure, convenient operation, good adaptability, high oxygen content in the sewage and good purification effect, and is mainly adapted to the treatment of domestic sewage.

The invention discloses a municipal wastewater purification treatment method which comprises a pretreatment step, a bioreaction step, a filtration step, a sterilization step and an adsorption step which are carried out in sequence, wherein in the pretreatment step, gravel and large-sized floating objects can be removed and a stable water source is provided for subsequent treatment; in the bioreaction step, municipal wastewater is removed in low-carbon and high-efficiency manners, the treatment load is high, the treatment effect is good, organic and inorganic carbon sources do no need to be additionally added, and the oxygen consumption and the reflux quantity are low; in the filtration step, small particles and suspended matters in the wastewater are further removed; in the sterilization step, harmful organisms such as bacteria and viruses in the wastewater are killed; in the adsorption step, calcium magnesium ions, fluorine ions and other heavy metal ions in the wastewater can be efficiently removed. Purified product water from which pollutants are basically removed is stable in water quality, and the water quality is superior to the national standard A.

The invention discloses an ozone catalytic fluidized bed device for treating high-concentration organic wastewater difficult to biodegrade, and relates to sewage treatment technology in the field of environmental protection. The ozone catalytic fluidized bed device structurally comprises an organic wastewater conveying pipeline and a dissolved air water conveying pipeline which are used for beingconnected with a sewage storage tank, a sewage pressure pump, an ozone generation device, a dissolved air pump, a fluidized bed reactor and a plurality of control valves, a top dissolved air water distribution pipe is arranged at the top of the fluidized bed reactor and is communicated with a dissolved air water distribution head to convey dissolved air water; the invention also discloses a methodfor organic wastewater treatment. The method comprises the following steps: adding the organic wastewater into the sewage storage tank, starting the ozone generation device, and filling a catalyst atthe bottom of the fluidized bed reactor; at least one part of ozone generated by the ozone generation device is mixed with the organic wastewater and then is conveyed to the dissolved air pump to generate dissolved air water; gas-dissolved water enters the bottom of the fluidized bed reactor through a pipeline from the top gas-dissolved water distribution pipe to the gas-dissolved water distribution head and is in contact with the granular catalyst to generate a catalytic degradation reaction.

The invention discloses a method for producing rose vinegar by a pump reflux method. The method comprises the following steps: rinsing rice; steaming rice; cooling cooked rice; putting the cooked ricein a tank and erecting a nest; floating; adding water; fermenting; aging; squeezing; and sterilizing. The tank is cylindrical, the upper end of the tank is open while the lower end of the tank is provided with a cone-shaped or arc-shaped bottom; a mash discharge hole is formed in the lowest part of the cone-shaped or arc-shaped bottom of the tank; the mash discharge hole is connected to a refluxspray hole in the upper end hole of the tank through a pipeline; a liquid pump is arranged on the pipeline; and a grass cover is arranged on the upper end hole. The fermenting step comprises the following steps: (1) medium frequency large reflux fermentation control in early stage; (2) high frequency medium reflux fermentation control in middle stage; and (3) low frequency small reflux fermentation control in later stage. According to the method for producing rose vinegar by the pump reflux method disclosed by the invention, the production scale of the rose vinegar can be expanded, the yield of the rose vinegar is increased, the quality of the rose vinegar is stabilized and improved, and the labor intensity is alleviated.

The invention discloses a municipal wastewater purification treatment method which comprises a pretreatment step, a bioreaction step, a filtration step, a sterilization step and an adsorption step which are carried out in sequence, wherein in the pretreatment step, gravel and large-sized floating objects can be removed and a stable water source is provided for subsequent treatment; in the bioreaction step, municipal wastewater is removed in low-carbon and high-efficiency manners, the treatment load is high, the treatment effect is good, organic and inorganic carbon sources do no need to be additionally added, and the oxygen consumption and the reflux quantity are low; in the filtration step, small particles and suspended matters in the wastewater are further removed; in the sterilization step, harmful organisms such as bacteria and viruses in the wastewater are killed; in the adsorption step, calcium magnesium ions, fluorine ions and other heavy metal ions in the wastewater can be efficiently removed. Purified product water from which pollutants are basically removed is stable in water quality, and the water quality is superior to the national standard A.

The invention relates to a liquid absorption core supporting element, a production method thereof and an integrated heat pipe. The liquid absorption core supporting element comprises a metal sheet of a wave belt shape formed by gear rolling, a metal sheet segment is provided between a wave crest and a wave trough, the wave crest and the wave trough are welded on the inner wall of the integrated heat pipe casing, a though hole is provided on the metal sheet segment, adjacent metal sheet fragments adhere together, and through holes on the metal sheet fragments are at least partially overlapped. The integrated heat pipe adopts the liquid absorption core supporting element, and the wave crest and the wave trough of the liquid absorption core supporting element metal sheet of a wave belt shape are connected on the inner wall of the integrated heat pipe casing. Metal sheets of a wave belt shape are formed by gear rolling and are connected in the integrated heat pipe by welding of wave crest and wave trough, overcoming problem of groove obstruction caused by melt welding liquid flowing into space between metal sheet segments. Metal sheets formed by gear rolling have smaller thickness and high porosity, thereby avoiding return liquid drying up and improving heat conduction effect of the integrated pipe.

The invention relates to an automatic nail insertion device of a prefabricated laminated plate with positioning nails. The automatic nail insertion device of the prefabricated laminated plate with thepositioning nails comprises a horizontal sliding mechanism, a longitudinal sliding mechanism, a nail entering mechanism and a flattening mechanism, wherein the nail entering mechanism comprises an insertion assembly arranged on the longitudinal sliding mechanism, a cement collecting assembly used for chiseling a pit in a cement board in a closed state and used for collecting scattered cement intothe chiseled pit in an opened state, a pressure limiting assembly arranged on the insertion assembly in a sleeving mode and used for limiting the scattered cement and a control assembly which is linked with the cement collecting assembly and used for controlling the nails in the insertion assembly to perform intermittent discharging; and the flattening mechanism comprises a tensioning assembly which is arranged at the rear of the moving track of the insertion assembly and is used for flattening the cement board with nail-driving completing and a guiding assembly which is used for guiding thesliding track of the tensioning assembly. The technical problems that large-sized stones are encountered and the pit is difficult to chisel when a hole is drilled on a prefabricated board after solidification, and after the nails are installed vertically, the installation of a heating pipe is affected due to falling off of the nails are solved

The invention relates to a cooling liquid recovery process for a six-axis grinding machine. The process comprises a workpiece grinding process, a cooling process and an impurity screening process, wherein the impurity screening process comprises the following steps: 1, gathering wastewater; 2, quantitatively dropping the wastewater; 3, shaking off impurities by oscillation; 4, outputting scrap iron; 5, outputting clean water; 6, outputting millstone particles; and 7, recycling clear water. The technical problems that scrap iron and millstone particles cannot be discharged in time, consequently, the water flow is low, output of much water cannot be achieved, and nearly equal amount of water circulates and flows back in time are solved.

The invention provides a sewage disposal tank integrating diversified processes of Orbal, bio-dopp, MBBR and MBR. The sewage disposal tank comprises a tank body, the tank body is internally provided with compartment plates which sequentially divide the tank body into an anaerobic zone, an anoxic zone, an aerobic zone, a sedimentation zone and a membrane filtration zone, water via holes are formedin the compartment plates, the tank body is provided with a water inlet and a water outlet, the water inlet is located in the anaerobic zone, and the water outlet is located in the membrane filtrationzone; the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone is (18-25):(25-35):(45-60), sewage in the aerobic zone flows back to the anaerobic zone through a sludge reflux pipe, and the membrane filtration zone is provided with an MBR membrane which is an MBR dynamic membrane, an MBR flat membrane or an MBR curtain membrane; carriers are arranged in the anaerobic zone, theanoxic zone and the aerobic zone respectively. The sewage disposal tank integrating diversified processes of Orbal, bio-dopp, MBBR and MBR has the advantages of being small in occupied area and highin disposal efficiency and effluent quality.

The invention discloses a preparation method of ethylene glycol antimony. The method comprises the following steps of: feeding antimonous oxide and ethylene glycol into a sealed reaction kettle according to the mass ratio of 1 to (4-7), and heating the antimonous oxide and the ethylene glycol to 120-150 DEG C to react for 1-3 hours at a pressure is -0.05MPa to -0.07MPa; adding active carbon to decolor the reaction liquid and remove impurities of the reaction liquid for 15-30 minutes after the reaction is finished; filtering the cleaned reaction liquid by a 200-400 mesh filter screen to obtain feed liquid; cooling the feed liquid to 35-25 DEG C to crystallize; and drying crystallized solid for 15-25 minutes in an centrifugal machine with 800-1200 r / min. The method is short in reaction time, short in flow and low in cost, and the ethylene glycol antimony prepared by the method is high in content and good in chromaticness, and can be widely applied to industrial production.

The invention relates to a continuous preparation process for an environment-friendly plasticizer and a device used in the process. The process comprises the following steps of: enabling solid terephthalic acid and isooctyl alcohol which serve as raw materials to react in the existence of an esterification catalyst and an antioxidant for continuously preparing dioctyl terephthalate (DOTP); pulpifying the solid terephthalic acid in the isooctyl alcohol until the particle size of the solid terephthalic acid reaches 5 to 20 mu m; adding the isooctyl alcohol so as to adjust the mole ratio of alcohol to acid in pulp liquid as 2:1 to 4:1; adding into a slurry tank, preheating, and entering a reaction kettle from the bottom; reacting with the preheated isooctyl alcohol which enters from the bottom of the reaction kettle in the reaction kettle in the existence of the esterification catalyst and / or the antioxidant; reacting until an acid value decreases to be below 2, and continuously feeding the raw materials namely the solid terephthalic acid and the isooctyl alcohol; and adding the DOTP which is generated in reaction from the upper part of the reaction kettle to a product tank, condensing the isooctyl alcohol which does not completely reacts and the generated steam through a condenser on the top of the reaction kettle, separating through an oil water separator, and entering an octyl alcohol tank for recirculation.

The invention relates to integrated sewage treatment equipment and method. The equipment comprises an inner barrel, a middle barrel and an outer barrel which are sequentially arranged from inside to outside, wherein an anaerobic zone is arranged inside the inner barrel; an anoxic zone is arranged between the middle barrel and the inner barrel; an aerobic zone is arranged between the outer barrel and the middle barrel; a through hole is formed in the side wall of the inner barrel; the through hole is used for introducing sewage in the anaerobic zone into the anoxic zone; a circulating hole is formed in the side wall of the middle barrel for realizing communication between the anaerobic zone and the aerobic zone; guide plates with adjustable deflection directions are separately arranged at the two sides of the circulating hole, and are used for controlling a circulating direction and circulating amount of sewage; the aerobic zone is provided with an aerator; and a film assembly is further arranged in the aerobic zone and is used for realizing solid-liquid separation in the aerobic zone. The equipment disclosed by the invention can conveniently and effectively treat sewage. Dischargedwater can reach primary standards of Town Sewage Treatment Plant Pollutant Discharge Standards (GB19818-2002). The invention further discloses a method for treating sewage by utilizing the equipment.

The invention discloses distributed rural domestic sewage low-energy-consumption integrated treatment equipment, and belongs to the technical field of water treatment. The equipment comprises an integrated box-shaped main body, wherein the interior of the integrated box-shaped main body is sequentially divided into an anoxic tank, an aerobic tank, a sedimentation tank and an equipment room by separation walls along a sewage flowing direction, the anoxic tank and the aerobic tank are filled with biological fillers, the nitrification liquid in the aerobic tank flows back to the anoxic tank in agas stripping manner so as to achieve the denitrification function, the active biological membrane in the aerobic tank degrades COD, ammonia nitrogen, total phosphorus and other pollutants while utilizes oxygen, mud-water separation is achieved through a structure form forming by matching the mud bucket plate with holes of the sedimentation tank and a mud baffle and an internal inclined pipe, supernatant is discharged through an effluent weir, and effluent can reach the first-level B standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant. A purpose of the invention is to provide distributed rural domestic sewage low-energy-consumption integrated treatment equipment having characteristics of simple and compact structure, small occupation area, low energy consumption and high treatment efficiency and used for sewage treatment.

A valve assembly that includes a valve body defining a fluid passage. First and second ends of the fluid passage define first and second ports for fluid flow. A spring and piston are located in the fluid passage. The piston has a travel length extending between first and second positions with a third position located therebetween. The spring biases the piston from the first toward the third position and is located outside the axial piston passage. The piston at least partially defines a first, second and at least one third opening. The first opening defines a variable constriction which increases in size as the piston moves from the first to third positions. The piston end wall defines the second opening and the piston sidewall defines the third openings. Movement of the piston from the third to second position exposes the third openings increasing the area of the second port.

The invention relates to a desulfurization wastewater treatment device which comprises a pH regulation area, a reaction area and a precipitation area, wherein the pH regulation area comprises an alkali regulation area and an acid regulation area independently arranged from each other; an upper water inlet is formed at one end of the alkali regulation area; a lower water outlet is formed on one side of the acid regulation area; a lower water inlet is formed on the other side of the acid regulation area; the alkali regulation area is communicated with the reaction area through a water outlet pipe; the reaction area is communicated with the precipitation area; and an outlet end of the precipitation area is communicated with the lower water inlet through a water outlet pipe of a precipitation tank. In the device provided by the invention, by adopting an integrated device and a high-load mixed-flow reaction unit, the volume of the reaction area is reduced; with a relatively large flocculation adsorption area, the treatment efficiency is improved, and the volume of the precipitation tank is reduced; and through a great quantity of sludge circulation, the reaction is more sufficient, and the drug is saved. The system is an efficient novel process integration device which is compact in structure and simple to control.

The invention relates to a rotational flow type active sludge sewage treatment device, which comprises a cylindrical shell and a venturi, wherein the inlet of a gradually-reducing part of the venturi is connected with a high-pressure pump, the throat part is connected with an air inlet pipe communicated with the atmosphere, the outlet of a gradually-expanding part is provided with a jet pipe extending forwards, and the jet pipe is connected with the bottom of the cylindrical shell tangentially. The air inlet pipe is provided with a one-way valve and an adjusting valve, the height position of the jet pipe on the venturi connected into the cylindrical shell is 10 to 20 percent of the height of the inner space of the shell, and the shell is provided with a sludge backflow pipe interface of which the structure ensures that the connection mode between a sewage backflow pipe and the shell is tangential connection and the direction accords with the tangential direction of the jet pipe so as to comply with the rotational flow direction of the sewage in the shell. The rotational flow type active sludge sewage treatment device has the advantages of simple structure, convenient operation and good adaptability, greatly improves the oxygen content in the sewage, enhances the contact opportunities among microorganisms in water pollutants and sludge, is advantageous for improving the sludge concentration and improving the purification effect of the sewage, and is mainly adapted to sewage treatment.