43results about How to "The processing effect is stable and efficient" patented technology

The invention provides a templated integration system and method for medical information system data and relates to the technical field of medical industry data integration. During the process of medical information system data integration, combined with target data standards and aimed at medical information system features (including manufacturers and versions, etc.), a reusable medical information system data integration template is established so as to realize data integration of different medical information systems (such as HIS, LIS, RIS, EMR,PEIS, etc.) Through solidification of special data set and the data conversion rules thereof, a reusable template for a certain medical information system during the process of multiple medical institution data integration is formed; at the same time, the different system templated integration process will enhance the adaptability of the template; a positive correlation between the reuse rate and completeness of the template is established; depending on the continuously improved and optimized template library resource, the implementation difficulty can be effectively reduced, the data integration efficiency can be increased, and the efficient and high quality development of medical information system integration programs is guaranteed.

The invention provides a heterogeneous system data mapping template-based medical data acquisition system and a heterogeneous system data mapping template-based medical data acquisition method. The system comprises a data acquisition unit, a data source management unit and a template management unit. The method comprises the following steps of acquiring business data information in a medical data source; acquiring a health data business standard on a regional health information platform, and according to the business standard, building a regional health information platform-based result set; if the current data mapping model completely accords with the result set, performing business standard-based data source data mapping processing, otherwise, if a data model according with the result set exists in the current data mapping model, multiplexing the data model, and if the data model according with the result set does not exist in the current data mapping model, executing the regional health information platform-based result set to build the data mapping model. By the system and the method provided by the invention, the standard acquisition of hospital data is realized, normalized acquisition on the data is realized through business constraints of a data acquisition template, and the data acquisition process is more normative and effective.

The invention discloses a sub-grid adjustable anaerobic-anoxic-aerobic biochemical reactor which is in the form of a covered way and comprises 24 sub-grid tanks (A), wherein the 24 sub-grid tanks (A) are divided into an anaerobic segment, an anoxic segment and an aerobic segment; a trough (B) is formed between every two sub-grid tanks from the first sub-grid tank (A) to the twelfth sub-grid tank (A); division plates (C) are inserted into the troughs (B) to realize the segmentation of the anaerobic segment, the anoxic segment and the aerobic segment; a water passing orifice is formed in the lower part of each trough (B); and an aerator is arranged at the lower part of each sub-grid tank (A) of the reactor. The biochemical reactor is reasonable in design and compact in structure, the relative residence time of the anaerobic segment, the anoxic segment and the aerobic segment can be flexibly adjusted according to the water quality condition of waste water to be treated, and when different waste water is treated or the water quality of the waste water to be treated is changed, the anaerobic segment, the anoxic segment and the aerobic segment can perform efficient biochemical treatment, so that the reactor can obtain an overall stable and efficient treatment effect and has good environmental and economic benefits.

The invention discloses a coking wastewater advanced treatment method and system and mainly aims to solve the problem that wastewater treated with a conventional coking wastewater treatment technology cannot meet an emission standard. According to the coking wastewater advanced treatment method and system, coking wastewater treated by a biochemical system is firstly treated through microwave radiation and then is subjected to iron-carbon micro-electrolysis catalytic reduction treatment, the wastewater is further subjected to heterogeneous Fenton catalytic oxidation treatment and subjected to coagulating sedimentation treatment and microfiltration treatment, and finally, the wastewater meets the emission standard. The coking wastewater advanced treatment method and system solve the problem that the coking wastewater after biochemical treatment cannot meet the emission standard with the conventional coking wastewater treatment technology, and have the characteristics of low chemical dosage, low sludge yield, low energy consumption and stable and efficient treatment effect.

A precipitated sludge backflow coagulation aiding and re-nucleation clarifying device comprises a water inlet and outlet unit, an agent adding and mixing unit and a coagulation precipitating unit. The coagulation precipitating unit comprises a shell connected with a water outlet part of a raw water tank. The shell is composed of an outer cylinder, a middle cylinder and an inner cylinder which are coaxial, a mixing area, a coagulating area, a flocculating area and a precipitating area are formed in the shell, a sludge outlet pipe is arranged at the bottom of the flocculating area, a water inlet and backflow precipitate sludge mixing area is communicated with a backflow sludge pipe, the sludge outlet pipe and the backflow sludge pipe are communicated with the rest of sludge pipes outside the shell, coagulation granules precipitate in the precipitating area by relaying on the gravity action. Raw water, a coagulating agent, a coagulant aid and backflow sludge are fully mixed in the mixing area. A coagulating reaction occurs with backflow sludge granules as coagulating nucleuses in the coagulating area. Growth and granulation of flocculating constituents are promoted with the re-nucleation action of the backflow sludge granules in the flocculating area. The precipitated sludge backflow coagulation aiding and re-nucleation clarifying device has the advantages that small agent consumption is achieved, the occupied area is small, outlet water quality is good, the backflow concentration of sludge is large, a small backflow amount is achieved, and control is easy.

The invention discloses a method for treating coal water slurry gasification wastewater with microbes. Wastewater sequentially enters a conditioning tank, a multifunctional tank, a composite denitrification tank and a sedimentation tank, and finally, is discharged after reaching the standard. A stirrer and an aerator are added to the multifunctional tank, and an aerator is arranged in the composite denitrification tank. A microbe carrier, which accounts for 1.0-2.5% by volume, and an environmental microbe preparation, which accounts for 1.5-4.0% by volume, are respectively added into the multifunctional tank and the composite denitrification tank. After being treated by the method disclosed by the invention, the ammonia nitrogen content in the coal water slurry gasification wastewater canbe controlled at below 15 mg / L, the COD (chemical oxygen demand) can be controlled at below 100 mg / L, and other indexes can also achieve Grade 1 in National Sewage Comprehensive Discharge Standard (GB8978-1996).

The invention discloses a U-shaped flow treatment method for saliferous hardly degraded organic wastewater. An accommodation body is adopted; on the upper part of the accommodation body, one end is used for feeding water, and the other end is used for discharging water; a middle baffle plate is vertically arranged in the accommodation body to ensure that the water flow can flow in the accommodation body in the U shape; and a filler which is obtained by uniformly mixing waste scrap iron and activated carbon particles is filled into the accommodation body; aeration is performed upward at the bottom of the accommodation body to ensure that the filler is contacted with the wastewater to shake, and meanwhile, wastewater can be subjected to combined action of reaction processes of primary battery reaction, reduction reaction, electrochemical enrichment, physical adsorption, coagulation and precipitation of iron ions and the like in the filler, and wastewater is treated so as to remove pollutant. The method has an efficient and stable treatment effect, the adopted accommodation body treatment device has a reasonable structural design, is convenient to install, runs efficiently and stably, and can overcome the disadvantages of high treatment cost of high-concentration hardly degraded organic wastewater, unsatisfactory effect and the like.

The invention discloses a corner adjustable type wastewater treatment biochemical reactor which is of annular gallery shape and comprises an anaerobic section (3), an anoxic section (5) and an aerobiotic section (7), wherein the anaerobic section (3) is connected with a water inlet pipe (1); the aerobiotic section (7) is connected with a water outlet pipe (8); a moveable separating plate (4) is arranged on the annular gallery; a slide rail (21) is arranged on an annular gallery wall; the moveable separating plate (4) is located on the slide rail (21); a driving device (20) is arranged at the center of the annular gallery; the moveable separating plate (4) is connected with the driving device (20) through a rotating arm (17); a water hole (22) is formed in the moveable separating plate (4). The corner adjustable type wastewater treatment biochemical reactor is reasonable in structure design; the relative staying time of each section can be flexibly adjusted according to the quality condition of the to-be-treated water; the microbial population is relative independent; the corresponding biochemical reaction environment is more stable; when different wastewater is treated, the efficient biochemical treatment can be kept; a settling pond is arranged at the center, so that the purifying effect is more excellent.

The invention discloses a denitrifying bacterium capable of efficiently denitriding under the condition of low carbon-nitrogen ratio and an application thereof. The denitrifying bacterium disclosed by the invention is Bacillus sp. DN-LWX4 which can be used to remove nitrate nitrogen, the perseveration number of the Bacillus sp. DN-LWX4 in China General Microbiological Culture Collection Center is No. 8290. The Bacillus sp. DN-LWX4 disclosed by the invention can be completely denitrified by glucose, ethanol, acetic acid, sodium acetate and other carbon sources, the removal rate of NO3-N can reach 95% when the initial concentration of NO3-N is 110.13mg / L; the carbon-nitrogen ratio of 3:1 is sufficient to satisfy the conditions of the bacterial demand for a carbon source, and the nitrogen removal rate of nitrate is 99.52% when the initial NO3-N concentration is 110.13mg / L.

The invention discloses a rotary adjustable anaerobic-anoxic-aerobic biochemical reactor. The rotary adjustable anaerobic-anoxic-aerobic biochemical reactor is in the form of a rotary channel, and are divided into 4 continuous water channels with equal width and height including an anaerobic segment, an anoxic segment, and an aerobic segment; volume distribution adjustment of the anaerobic segment, the anoxic segment, and the aerobic segment can be realized by moving movable separating plates; the lower parts of the movable separating plates are provided with water passing orifices; and the lower part of each channel of the rotary adjustable anaerobic-anoxic-aerobic biochemical reactor is provided with a controllable aerating apparatus. The rotary adjustable anaerobic-anoxic-aerobic biochemical reactor is reasonable in design and compact in structure; the channels are designed to be flexible, and adjustment is convenient and practicable; investment and operation cost is low; the relative hydraulic retention time of the anaerobic segment, the anoxic segment and the aerobic segment can be flexibly adjusted according to the water quality conditions of waste water to be treated; and when different waste water is treated or the water quality of the waste water to be treated is changed, overall stable and efficient treatment effects of the rotary adjustable anaerobic-anoxic-aerobic biochemical reactor can be maintained, and excellent environmental benefits and economic benefits are obtained.

The invention discloses a method for quickly starting a denitrifying desulfurization process, relates to the method for starting the denitrifying desulfurization process, and aims to solve the technical problems that in the conventional denitrifying desulfurization process, the starting period is long, granule sludge is hard to form, the biological holding amount is low, and a long-term, stable and efficient treatment effect is hard to keep. The method comprises the following steps: I, forming stable and mature granule sludge; II, carrying out denitrifying desulfurization. The method has the following advantages: (1) the method is stable and efficient in treatment efficiency, and the removing rate of sulfide, nitrate and acetate is 95% or above; (2) the granule sludge formed by sulfate and sodium lactate as the main components of the substrate is adopted as inoculated sludge, and the denitrifying desulfurization process is started and operated, so that the biological holding amount of autotrophic denitrifying bacteria in the granule sludge is improved, the risk of autotrophic denitrifying bacterium loss is reduced, the efficiency of sulfide oxidization is guaranteed, and the endurance capacity of the system for toxicity of sulfide can be effectively improved.

The invention discloses a high concentration waste emulsion deep treatment system. The system at least includes: an acid-base regulating pool, which is used for adjusting the pH value of waste emulsion; a demulsification reaction stirring pool, which is used for receiving the waste emulsion subjected to pH value adjustment by the acid-base regulating pool, and adding a PAC and PAM mixed demulsification solution; an inorganic ceramic membrane purifier, which is used for receiving the liquid output by the demulsification reaction stirring pool and purifying the liquid under a pressure state. According to the invention, the PAC and PAM combination is adopted as the demulsifier, charged oil droplets, colloid, suspended matters and other large particle substances in the waste emulsion are connected by adsorption bridging effect, therefore oil and water are separated to achieve the oil-water separation purpose. Then an inorganic ceramic membrane is used as the main body separation process, and by means of physical interception, low concentration waste emulsion can flow into a purification water tank through the ceramic membrane, and the oil droplets, colloid, suspended matters and otherlarge particle substances can flow back. The high concentration waste emulsion deep treatment system provided by the invention realizes low energy consumption, high efficiency and synchronous removalof pollutants from the waste emulsion.

The invention discloses a composite fiber modular bio-filler and its layout method used for sewage treatment in the new material field for environmental protection. It fixes the polyamide fiber and polyester fiber webs on the stainless steel frame, where the polyamide fiber web is placed in the middle and the polyester fiber web is on both sides to form a modular composite fiber structure of three-tier network. It first installs the channel beam or angle steel mold base in the biochemical treatment pool, which connects the biochemical pool through the expansion bolts; the filler connects the channel beam through its stainless steel framework and is arranged according to the adjacent column crossing method and at an angle of 55 DEG-75 DEG between the module and the biochemical pool bottom. The invention can greatly reduce the cost of supporting structure and has a strong capacity to resist shock load. It can improve the number of microorganisms per unit volume in the biochemical pool, improve the wastewater treatment performance, the original pool pollutant volume load and the capacity to resist water impulse and also has the features as easy installation and maintenance.

The invention discloses a stabilizer for repairing soil heavy metal pollution and an application method thereof. After the stabilizer is used for carrying out stabilization treatment on heavy metal polluted soil, the leaching concentration of soil heavy metal ions is lower than a standard limited value of Identification Standard for Hazardous Wastes-Identification for Extraction Toxicity; the cost of raw materials of the stabilizer is relatively low and the stability of the treated soil heavy metal ions is high.

The invention provides a cutting emulsion wastewater treatment system and a cutting emulsion wastewater treatment method. The system comprises an adjusting pool, an oil separation pool, an agent feeding pool, an air floatation unit, a middle pool, a security filter, a catalytic oxidation unit, a middle water pool, a heat exchanger, a UASB reactor, a contact oxidation device, an MBR unit, a clear water pool, a circulating pump and an incineration system. According to the present invention, the system and the method select the active carbon loaded transition metal catalyst, and have characteristics of efficient and stable treatment effect, short reaction time, low chemical sludge yield, no hardening of the filler, low backwash frequency and low filler loss; based on catalytic oxidation, thetoxic and harmful substances in the raw water are subjected to ring opening and chain breaking so as to improve the biodegradability of the wastewater, provide the conditions for the application of the biochemical system, remove the organic pollutants, and reduce the sludge yield of the biochemical system and the investment and operation cost of the subsequent biochemical system; and the system and the method have advantages of strong impact load resistance, high and stable treatment efficiency, low operation cost and no toxic and harmful odor emission, and can be widely used in low-biodegradability and high-concentration organic wastewater treatment.

The invention relates to a process for neutralizing and rectifying high-hydrochloric-acid n-butyl alcohol wastewater. The method comprises the following steps: (1) adding high-purity calcium stone into a stone neutralizing tank, wherein the hydrochloric acid in wastewater can be neutralized by calcium carbonate in the calcium stone; (2) arranging a first-stage lift pump in a regulating tank, and controlling high start and low stop by a floating ball liquid level meter to supply water to the neutralizing tank; (3) adding a small amount of calcium carbonate powder into the neutralizing tank to neutralize the wastewater to be neutral, then conveying the wastewater to a security filter through a second-stage lifting pump, and filtering; (4) enabling the wastewater filtered by the security filter to enter a raw material storage tank under the pressure of a pump; (5) arranging a third-stage lift pump in the raw material storage tank, arranging a flow meter and a pneumatic valve, and controlling the flow of the wastewater entering a rectifying tower through the pneumatic valve so as to achieve the separation of n-butyl alcohol from water; and (6) arranging a finished product tank beside the rectifying tower, wherein the finished product tank is used for receiving the separated n-butyl alcohol. The method can be used for efficiently and stably treating the high-hydrochloric-acid n-butyl alcohol wastewater.

The invention discloses a secondary constructed wetland treatment system applicable to advanced nitrogen and phosphorus removal of domestic sewage. The building method of the system comprises the following steps: (1) uniformly distributing domestic sewage through a water distribution pipe in a centralized manner, and entering the primary constructed wetland treatment unit which is built by taking volcanic rock as a main filler; the filler of the first-stage constructed wetland treatment unit sequentially comprises 2-4mm ceramsite (with the thickness of 20cm), 4-8mm volcanic rock (with the thickness of H1) and 10-20mm gravel (with the thickness of 30cm) from top to bottom; and (2) the effluent of the primary treatment unit is concentrated and uniformly distributed by a water distribution pipe and enters a secondary artificial wetland treatment unit which takes natural manganese sand as a main filler. And the filler of the secondary artificial wetland treatment unit sequentially comprises 2-4mm ceramsite (with the thickness of 20cm), 4-8mm natural manganese sand (with the thickness of H2) and 10-20mm gravel (with the thickness of 30cm) from top to bottom. After deep nitrogen and phosphorus removal through the two-stage constructed wetland, the nitrogen and phosphorus concentration of the domestic sewage effluent can reach the surface water environment quality standard. The method has the characteristics of ecological economy, efficient and stable treatment effect and the like, and can achieve the purpose of deep phosphorus and nitrogen removal.

An integrated soil restoration photocatalytic reactor, a reactor shell thereof comprising a soil grinding chamber and a three-phase cyclic photocatalytic degradation chamber; the soil grinding chamber is connected to the three-phase cyclic photocatalytic degradation chamber, and a cutting blade (4) is rotatably connected to an inner wall of the soil grinding chamber so as to efficiently, rapidly, and uniformly grind soil; a soil inlet is opened on the inner wall of the soil grinding chamber, and a soil outlet is opened on a bottom wall of the three-phase cyclic photocatalytic degradation chamber; a spraying device is arranged above the three-phase cyclic photocatalytic degradation chamber, an aeration device is arranged below the chamber, and an ultraviolet LED light (8) is arranged in the middle; guide plates (6) are symmetrically arranged on both sides of the ultraviolet LED light (8) so that three phases of gas, liquid and solid may be uniformly mixed and may flow circularly; a surface of the guide plate (6) is coated with a photocatalyst titanium dioxide, thus solving the problem wherein a catalyst is difficult to recycle; the device integrates the functions of cutting and refining soil and photocatalytic restoration of soil, and has the advantages of a small area, a simple structure, a mild reaction condition, absence of secondary pollution, and an efficient and stable treatment effect.

The invention provides a device for treating high-concentration pharmaceutical wastewater through electric power assisted microbial enhanced degradation and a method for treating the pharmaceutical wastewater, relates to a pharmaceutical wastewater treatment device and a pharmaceutical wastewater treatment method adopting the device and aims to solve the technical problems of low toxicity removal rate and poor COD (chemical oxygen demand) removal capacity of a conventional high-concentration pharmaceutical wastewater treatment method. The device comprises a water inlet, a water outlet, a tank body, a top cover, water quality monitoring ports, organic glass sheets, carbon fiber brushes, titanium wires, a gas collecting pipe, a wet gas flow meter, a water seal tank, a sludge deposit hopper and a sludge drain port. The method comprises steps as follows: step one, sludge is sieved by a screen, pharmaceutical wastewater is added to the sludge, NaH2PO3 and NH4Cl are added, acclimatization is performed for 2 weeks, and a mixture after acclimatization is added to each isolation chamber of the pharmaceutical wastewater treatment device; step two, the titanium wires are connected with a transformer, the device operates in a sequencing batch type mode, then the operating mode is changed into a continuous water feeding mode, water is discharged from the water outlet, and the water treatment process is finished. The device and the method are applied to the field of sewage treatment.

The invention discloses a recycling treatment method of high-ammonia-nitrogen wastewater. The method comprises the steps of adjusting delivery volume of three streams of wastewater flowing to a prepositioned denitrification tank so as to control the mass ratio of C / N in the prepositioned denitrification tank to be greater than 4, meanwhile, control the DO of the prepositioned denitrification tankto be smaller than 0.5mg / L, and control the DO of an aerobic pool to be smaller than 1.5mg / L, the MLSS of the aerobic pool to be 4,000mg / L to 6,000mg / L and the C / N mass ratio of the postpositioned denitrification tank to be greater than 2.5, completing biochemical treatment on the high-ammonia-nitrogen wastewater with a TN value greater than 500g / L and a NH3-N value greater than 400mg / L, then, carrying out deep treatment of high-density precipitation and ozone catalyzed oxidation, and finally, carrying out recycling treatment of ultrafiltration and reverse osmosis, thereby obtaining deionizedwater capable of being recycled to production. According to the recycling treatment method of the high-ammonia-nitrogen wastewater, the treatment performance is stable and efficient, the operating isenvironmentally friendly and is low in cost and free of secondary pollution, the high-ammonia-nitrogen wastewater can be directly recycled to production, and thus, water resources are saved.

The invention discloses a particle-reinforced iron-based composite material, a ball milling preparation method and an application thereof. The iron-based composite material uses monometallic iron as a parent matrix, and uniformly intersperses particle reinforcements with relatively high hardness in the iron matrix through a ball milling process. The particle reinforcement can be used as an abrasive in the ball milling process to accelerate the ball milling process, and due to the uniform dispersion of the particle reinforcement in the iron phase, many highly reactive areas are formed between the particle reinforcement and the iron interface, which is conducive to adsorption. Organic matter in this area is reductively degraded. The particulate reinforcement includes at least one of quartz sand, alumina, boron carbide and silicon carbide. The preparation method is simple and easy, and the materials used are cheap and easy to obtain. The particle-reinforced iron-based composite material provided by the invention can also efficiently reduce and degrade halogenated and nitro organic pollutants in waste water, has efficient and stable treatment effect, wide pH adaptability range, and high material reutilization rate.

The invention relates to a sulfuric acid mist purification device of a high-performance storage battery. The sulfuric acid mist purification device of the high-performance storage battery comprises a purification tower, a rotary flow plate, a first spraying device, a first filling layer, a second spraying device, a second filling layer, a filtering screen and a circulation water tank, wherein the rotary flow plate, the first spraying device, the first filling layer, the second spraying device, the second filling layer, the filtering screen and the circulation water tank are sequentially arranged in the purification tower from top to bottom; the circulation water tank is connected with a circulation water pump through a water inlet pipeline; clean water in the circulation water tank can be sprayed into a tower of the purification tower from the upper part of the purification tower by the circulation water pump; the purification tower is also connected with an air suction machine through an air suction pipeline; the air suction pipeline is connected with a gas collecting cover. The multi-layer sprayer and the filling layer are used, so that the air-liquid contact area is greatly increased; the absorption efficiency is improved; through the filtering by the filtering screen, larger particles are effectively prevented from being discharged into the air; the exhausted air is enabled to conform to the national standard; the structure is simple; the processing effect is stable and efficient.

The invention discloses a sub-grid adjustable anaerobic-anoxic-aerobic biochemical reactor which is in the form of a covered way and comprises 24 sub-grid tanks (A), wherein the 24 sub-grid tanks (A) are divided into an anaerobic segment, an anoxic segment and an aerobic segment; a trough (B) is formed between every two sub-grid tanks from the first sub-grid tank (A) to the twelfth sub-grid tank (A); division plates (C) are inserted into the troughs (B) to realize the segmentation of the anaerobic segment, the anoxic segment and the aerobic segment; a water passing orifice is formed in the lower part of each trough (B); and an aerator is arranged at the lower part of each sub-grid tank (A) of the reactor. The biochemical reactor is reasonable in design and compact in structure, the relative residence time of the anaerobic segment, the anoxic segment and the aerobic segment can be flexibly adjusted according to the water quality condition of waste water to be treated, and when different waste water is treated or the water quality of the waste water to be treated is changed, the anaerobic segment, the anoxic segment and the aerobic segment can perform efficient biochemical treatment, so that the reactor can obtain an overall stable and efficient treatment effect and has good environmental and economic benefits.

The invention discloses a bioreactor-plant nursery retention tank combined system which comprises a water distributing tank, a bioreactor, an adjusting tank and a plant nursery retention tank, whereinthe water distributing tank, the bioreactor, the adjusting tank and the plant nursery retention tank are sequentially combined from front to back; the water distributing tank is connected with the bioreactor through a pipeline, outlet water of the bioreactor can directly enter the adjusting tank, and an overflow opening of the adjusting tank is connected with the plant nursery retention tank. Domestic wastewater is collected and sequentially flows through the devices to be further purified. According to the bioreactor-plant nursery retention tank combined system disclosed by the invention, plants and ecological units are organically combined; thus, the bioreactor-plant nursery retention tank combined system has good adaptability to water quality and water volume change, has simpleness inoperation and management, has a good treating effect on rural distributed sewage and especially has a high-efficiency and stable treating effect on phosphorus nutrient salt which is difficult for an ordinary biological system to treat; a COD and TP removing rate can reach 90% or more, and a TN removing rate is as stable as 85 to 90%; the bioreactor-plant nursery retention tank combined system is suitable for treating rural distributed sewage and beautifying rural environment.

A settling sludge return coagulation aiding and coagulation clarification device, including a water inlet and outlet unit, a chemical dosing and mixing unit, and a coagulation and sedimentation unit, wherein the coagulation and sedimentation unit includes a shell connected to the water outlet of the raw water tank, and the shell is composed of the same The outer cylinder of the shaft, the middle cylinder and the inner cylinder are composed of three layers of cylinders. The mixing zone, the coagulation zone, the flocculation zone and the sedimentation zone are formed in the shell. The area is connected to the return sludge pipe, and the sludge outlet pipe and the return sludge pipe are connected to the remaining sludge pipe outside the shell. The flocculated particles settle in the sedimentation area by gravity. The sludge is fully mixed. In the coagulation zone, the coagulation reaction occurs with the return sludge particles as the coagulation core. In the flocculation zone, the nucleation of the return sludge particles is used to promote the floc growth and granulation. It has the characteristics of small amount, low floor space, good effluent quality, high sludge return concentration, small return flow and easy control.