89 results about "Oxidation ditch" patented technology

The invention discloses an oxidation ditch sludge state monitoring method and system, and relates to the field of computers, and the method comprises the steps: obtaining image data; generating unique metadata for each piece of image data; performing data annotation on the image data; recognizing the image data according to the image recognition model to obtain a recognition result; the metadata and the recognition result are fused, and cue words are constructed; inputting the cue word into the large model to obtain an analysis result; and generating a diagnosis report according to the analysis result. Through high-precision image monitoring and the deep reasoning analysis capability of a large model, the sludge state change is mastered in real time, so that the real-time, accurate and intelligent monitoring and diagnosis of key indexes such as sludge structure stability and filamentous bacteria abundance are realized.

The utility model belongs to the technical field of sewage treatment, and particularly relates to high-strength integrated large metal equipment for biological sewage treatment, which comprises a water inlet pipe, a water outlet pipe, sewage, activated sludge, an aeration oxygen supply device and a metal shell so as to form a pool-shaped biological sewage treatment system. A metal shell on the periphery of the pool-shaped biological sewage treatment system is composed of hollow double-layer metal composed of two layers of metal plates and a core pipe in the middle, the hollow double-layer metal is formed through hot air copper brazing of the core pipe, and an air channel and a flow channel are formed between the inner gap and the outer gap of the core pipe. The activated sludge is formed by combining an oxidation ditch and an MBR, the aeration oxygen supply device comprises a fixed rubber aeration pipe, and the metal shell is made of a stainless steel material.The device has a heat preservation measure, the sludge activity can be improved, the equipment strength is high, the overall installation efficiency of the equipment is high, rapid splicing is achieved, and the service life of the equipment is prolonged. Compared with other large-scale sewage biological treatment equipment, the cost is lower.

The invention discloses an urban sewage treatment system which comprises a water inlet channel, a pretreatment mechanism, a primary sedimentation ditch, a grease adsorption mechanism, an oxidation ditch and a secondary sedimentation ditch, the water inlet channel is communicated with the primary sedimentation ditch, the pretreatment mechanism is arranged in the water inlet channel, most solid impurities in sewage are removed through the pretreatment mechanism, and the grease adsorption mechanism is arranged in the oxidation ditch. A grease adsorption mechanism is arranged in the primary precipitation ditch, is communicated with the oxidation ditch at the tail part of the primary precipitation ditch, and is communicated with the secondary precipitation ditch after oxidation; grease in sewage can be conveniently cleared away before biochemical treatment, so that the aeration time of subsequent biochemical treatment is shortened, and the sewage treatment efficiency is improved.

The invention discloses an oxidation ditch optimization method and system based on computational fluid mechanics simulation and a medium, mainly relates to the technical field of oxidation ditch optimization, and aims to solve the problems that an existing process of searching and solving unsmooth backflow, high energy consumption and sludge deposition and an adjustment process of an oxidation ditch operation state highly depends on artificial experience and needs to be repeatedly tested and verified, and the working efficiency is high. And the problems of long adjustment period and low efficiency are solved. Comprising the steps of establishing an oxidation ditch three-dimensional model; obtaining distribution data, a velocity field and sludge concentration distribution data; presetting operation parameters, returned by the expert terminal, of the stirrer and the water impeller; using the oxidation ditch three-dimensional model to simulate angles and rotating speeds of a flow impeller and a stirrer meeting a preset flow field flow state under different sewage, mixed liquid and return sludge flow data, and storing the angles and rotating speeds in a simulated flow field flow state database; actual water flow data are collected, and corresponding angle and rotating speed data of the water impeller and the stirrer are obtained from the simulated flow field flow state database to be automatically adjusted.

The invention discloses a sewage treatment device with an intelligent phosphorus removal agent adding system, which comprises a phosphorus removal agent adding system, an oxidation ditch structure and a secondary sedimentation tank, and the secondary sedimentation tank is communicated with the oxidation ditch structure; in the whole phosphorus removal agent adding process, the phosphorus removal agent can be automatically added according to the orthophosphate measured value measured by orthophosphate measuring equipment, and in the circulating regulation process, the influence of the initial orthophosphate demand value can be gradually reduced, so that the timeliness in the whole adding system is higher, the adding amount of the phosphorus removal agent is more accurate, and the phosphorus removal efficiency is improved. The orthophosphate index of the effluent of the secondary sedimentation tank is stable and close to the required value, and the dephosphorization effect is better; the stirring structure is arranged to mix water and iron salt on site and prepare the phosphorus removal agent, so that the iron salt content is more stable, the prepared phosphorus removal agent is temporarily stored in the agent temporary storage bin, the spiral shoveling plate is used for continuously mixing bottom liquid and upper liquid, the iron salt content is uniform, and the iron salt content in the added phosphorus removal agent is more accurate.

The invention relates to an induced granulation type oxidation ditch reactor for continuous flow aerobic granular sludge culture and a use method thereof, the induced granulation type oxidation ditch reactor comprises a reaction chamber, the reaction chamber is divided into an aerobic zone and an anoxic zone by a baffle plate, the top of the aerobic zone is connected with a support, a selector is arranged above the support, and the selector is communicated to the bottom of the aerobic zone through a selector water outlet pipe; the bottom of the side wall of one end of the selector is communicated with a sewage inlet pipe, a multi-tank sedimentation tank is arranged on one side in the anoxic zone and communicated with the selector through a gas stripping pipe, a sedimentation tank inlet is formed in one end of the multi-tank sedimentation tank, and a reactor water outlet pipe is arranged at the other end of the multi-tank sedimentation tank; the selector, the multi-tank sedimentation tank and the gas stripping system are integrated, sludge with different particle sizes or sedimentation properties is screened through the multi-tank sedimentation tank, and a sludge-water mixture directionally flows back to different positions in the selector in a gas stripping manner, so that the sludge with small particle sizes or poor sedimentation properties is mixed with high-matrix sewage to strengthen a satiation stage; and the large-particle-size sludge flows back to the low-matrix area, so that particle formation and stable operation of the system are promoted.

This invention discloses a method for treating high-COD benzene-containing wastewater from phenol and acetone production, comprising sequential pretreatment and biological treatment. The pretreatment includes a single-effect falling film evaporator, a first-effect evaporator, a second-effect evaporator, and a third-effect evaporator. The biological treatment includes an acidification hydrolysis tank, an oxidation ditch, a primary aerobic tank, a secondary aerobic tank, a primary sedimentation tank, a secondary sedimentation tank, and a sludge thickening tank. This invention achieves chain-breaking degradation and carbon reduction, effectively treating the wastewater and ensuring that the final effluent meets the prescribed discharge requirements.

The present invention discloses a biochemical aeration system for an oxidation ditch in a sewage treatment plant, which includes a first aeration pipe group (1) and a second aeration pipe group (2) located in the middle layer of the aerobic zone of the oxidation ditch. A swirl aerator (3) is arranged between the first aeration pipe group (1) and the second aeration pipe group (2); the first aeration pipe group (1) includes two symmetrically distributed first aeration pipes (101), and the first aeration pipes (101) are inclined; the second aeration pipe group (2) includes multiple concentrically arranged annular aeration pipes (201) up and down. An air delivery connecting pipe (202) is arranged between adjacent annular aeration pipes (201), and the diameters of the annular aeration pipes (201) decrease successively from bottom to top. The present invention has the characteristic of being able to effectively improve the overall aeration effect.

The utility model relates to the technical field of float sludge cleaning, in particular to an oxidation ditch float sludge cleaning device which comprises an oxidation ditch body, a collecting mechanism used for collecting float sludge is arranged in the oxidation ditch body, and a driving mechanism used for directionally moving the collecting mechanism is arranged at the top of the oxidation ditch body. Cleaning mechanisms for discharging float sludge are arranged on the two sides of the oxidation ditch body, and each collecting mechanism comprises a collecting tank and a sludge scraping screen frame. According to the device disclosed by the utility model, the collecting mechanism and the driving mechanism are arranged, so that the device can automatically clean floating sludge in the oxidation ditch, the winding wheel a pulls the traction rope a to enable the sludge scraping net frame to move on the directional guide rail, and the sludge scraping net frame collects the floating sludge on the pool surface in the moving process; when the sludge scraping screen frame is separated from the directional guide rail and enters the collecting tank, the clamping block is clamped with the clamping groove, so that the floating sludge on the pool surface is comprehensively collected, and the floating sludge cleaning effect of the device is ensured.

The utility model discloses an oxidation ditch for sewage treatment, which relates to the field of sewage treatment and comprises an oxidation pond, a water pumping pipe and a water inlet pipe are respectively arranged on two sides of one end of the oxidation pond, mounting sleeves are fixed on two sides of one end of the oxidation pond and in the middle of one side of the oxidation pond, and the water pumping pipe and the water inlet pipe are connected with the mounting sleeves; a filter part is arranged in one side of one end of the oxidation pond, and a biological treatment assembly is arranged at the other end of the oxidation pond and is used for treating sewage in the oxidation pond; a sludge pumping assembly is arranged on one side of the filtering part, is arranged on one side of the oxidation pond and is used for pumping and treating sludge settled in the oxidation pond. According to the sewage treatment device, the filtering piece is arranged in the oxidation pond, and the coarse filtering plate on the filtering piece plays a role in preliminarily filtering sewage, so that large foreign matters in the sewage can be filtered out, and workers can intensively fish out the large foreign matters conveniently.

The invention relates to a facultative anaerobic MSBR sewage treatment method. Raw water enters an anaerobic zone oxidation ditch to be subjected to anaerobic circulation baffling treatment; the sewage treated in the step A enters an oxidation ditch of an anoxic tank through a channel below a partition wall to be subjected to circulating baffling treatment; the sewage treated in the step B enters an oxidation ditch of a facultative tank through a pipeline below the partition wall to be subjected to circulating baffling treatment, and the facultative tank enables part of mixed liquid to flow back to the anoxic tank through a backflow pipe; the sewage treated in the step C enters an SBR pool through a channel below the partition wall to be treated, part of sludge flows back to the anaerobic zone oxidation ditch through a sludge pump, and part of sludge is discharged through a sewage pump; and discharging the clear water treated in the step D from a water outlet of the SBR tank. According to the invention, the nitrogen and phosphorus removal function is enhanced, the conditions that the TN of the effluent of the secondary biochemical pool in conventional sewage treatment is difficult to break through 10mg / L and the TP is difficult to discharge below 0.5 mg / L are overcome, and meanwhile, the requirements of energy conservation, consumption reduction and land conservation are met.

The utility model discloses a liftable aeration system for an oxidation ditch. The liftable aeration system comprises a bottom plate, an outer ditch and an inner ditch, a positioning frame is arranged at the top of the bottom plate, and an anoxic zone is formed in the positioning frame; the outer groove is formed in one side of the positioning frame, and a middle groove is formed in one side of the outer groove; the inner ditch is formed in one side of the outer ditch; according to the utility model, gas flows to the inside of the aeration pipe from the inside of the square head and the joint, and the gas is sprayed out from the surface of the aeration pipe to the inside of the outer ditch and the inside of the inner ditch, so that the aeration inside the outer ditch and the inner ditch is improved; the sealing ring is arranged between the joint and the square head to seal gas, so that the gas is prevented from flowing out from a gap between the joint and the square head; the aeration pipes are arranged in the outer ditch and the inner ditch, gas enters the aeration pipes through the gas inlet pipes, the gas is sprayed out from the interiors of the aeration pipes, aeration is increased, the oxidation rate is increased, the content of dissolved oxygen in water can be increased through aeration, and oxygen needs to be consumed when microorganisms degrade pollutants.

The invention discloses three-dimensional circulating oxidation ditch equipment which solves the problem of unicity of circulating flow of a mixed solution of sewage and activated sludge and improves the sewage treatment effect of different types of microorganisms. According to the technical scheme, the device comprises a shell, a treatment chamber and a settling chamber, the treatment chamber and the settling chamber are both arranged in the shell, and the settling chamber is arranged at one end of the treatment chamber; a shunting layer partition plate is arranged in the treatment chamber and is used for dividing the treatment chamber into an upper-layer channel and a lower-layer channel, an impeller aeration device is arranged at the top of the upper-layer channel, and a plug flow pump is arranged at one end, close to the settling chamber, of the lower-layer channel; a sewage inlet and a stirring shaft are vertically arranged in the middle of the settling chamber, the stirring shaft and the sewage inlet are coaxially arranged, a settling pond is arranged below the stirring shaft, a sludge pump is arranged at the bottom of the settling pond and communicated with the plug flow pump, and a water outlet is further formed in the side wall of the settling chamber.

The utility model relates to the related technical field of sewage treatment, in particular to an intensive oxidation ditch and sedimentation integrated pool which comprises a bottom plate and a pretreatment mechanism, the pretreatment mechanism is arranged on one side of the surface of the bottom plate, and an oxidation and sedimentation mechanism is arranged at one end of the bottom plate. According to the intensive oxidation ditch and sedimentation integrated pool, through the arrangement of the pretreatment mechanism, sewage enters the pretreatment mechanism through a first water inlet, firstly flows into a first box body, passes through a water inlet hopper, and is preliminarily filtered through a first filter frame and a filter screen mounted inside, so that large-particle impurities in water are removed; filtered water is conveyed to a first water pump through a first connecting pipe, the water pump pumps the water to a follow-up treatment unit, tempered glass of the pretreatment mechanism can protect the internal structure, the water flow state is easy to observe, and it is ensured that the filter frames are firmly fixed and convenient to disassemble and clean through the two filter frames and bolts distributed at equal intervals.

The invention provides a rotary disc aerator with spiral plug flow, which overcomes the tedious structure of an oxidation ditch rotary disc aerator, is reasonable in design and good in aeration effect, and comprises a driving motor, a speed reducer, a mounting frame, a rotating shaft, a main shaft and a rotary disc which are connected in sequence, the main shaft is longitudinally distributed and is driven by a motor, and the core is that the rotating disc aerator and the water impeller are combined into a whole, so that the unification of surface flow pushing and mechanical aeration is realized.

The utility model discloses an oxidation ditch type sewage nitrogen and phosphorus removal device, and relates to the technical field of sewage treatment. The oxidation ditch type sewage nitrogen and phosphorus removal device comprises a sewage aeration tank and a defoaming mechanism, the defoaming mechanism comprises a mounting plate, a threaded rod, a driving motor, a sliding block, a connecting rod, a fixing frame, a limiting strip and a rotating baffle, the mounting plate is fixedly connected to the surface of the sewage aeration tank, and the threaded rod is rotationally connected to the surface of the mounting plate; the driving motor is fixedly connected to the surface of the mounting plate, the output end of the driving motor is fixedly connected with the threaded rod, floating foam can be scraped into the foam treatment pond through movement of the rotating baffle, the water surface cleanliness is improved, the rotating baffle rotates on the outer surface of the connecting rod under water flow resistance when resetting, and the rotating baffle is driven to rotate. And therefore, a gap is formed between the rotating baffle and the fixing frame, floating foam can be discharged from the gap, the situation that the floating foam is scraped to the other side during resetting is avoided, the device is cleaner, and the cleaning difficulty is reduced.

The utility model discloses an air push flow type bottom exposure oxidation ditch system belongs to biochemical treatment technical field of sewage treatment plant. The system includes oxidation ditch pool body, and oxidation ditch pool body is by the water inlet pipe, anaerobic area, anoxic area, aerobic area and water outlet pipe who links to each other in proper order is formed, and its characterized in that: the aeration assembly and push flow subassembly are equipped in the aerobic area, and the gas supply subassembly that supplies the aeration assembly and push flow subassembly is equipped with in the pool body side of aerobic area, and the aeration assembly and push flow subassembly are respectively by multiple aeration ware units and air push flow unit who set up along the pool body longitudinal interval are formed, and the air push flow unit includes gas supply cross pipe, and multiple gas supply vertical pipes who extend to the pool bottom and can be dismantled are arranged at the gas supply cross pipe interval, and the bottom push flow ware and middle push flow ware are all installed on the gas supply vertical pipe. The oxidation ditch system is the novel oxidation ditch system that sets high -efficient aeration, air push flow, convenient repair as a whole.

The invention discloses vertical flow type oxidation ditch sewage treatment equipment and a sewage treatment process, the sewage treatment equipment comprises an equipment main body, the equipment main body is internally provided with a plurality of biochemical reaction zones and settling zones which are sequentially connected in series; a sludge return area is arranged at the bottoms of the partition plates of the plurality of biochemical reaction areas, sludge in the sludge return area flows back to the first biochemical reaction area through a gas stripping return device and is mixed with inlet water of an equipment water inlet pipe, and the rear end of the sludge return area is communicated with the sludge deposition area; a bidirectional aeration device is arranged between every two adjacent biochemical reaction areas; the bottom sludge backflow area is additionally arranged, and compared with a traditional oxidation ditch process, the overall biomass in equipment can be increased, and the sewage treatment effect is improved; through the arrangement of the bidirectional aeration device, the aeration holes in the lower part of the aeration disc face the sludge backflow area, so that an air layer is formed in the oxidation ditch process and the sludge backflow position, and the effects of promoting sludge backflow, preventing sludge from aging and stacking and reducing the sludge dewatering difficulty can be achieved.

The invention discloses an oxidation ditch effluent total nitrogen control method based on a precise aeration system. The method comprises the following steps: constructing a mathematical model between oxidation ditch effluent total nitrogen and ammonia nitrogen concentration; calculating the corresponding ammonia nitrogen concentration as a control target through a mathematical model according to the target value of the effluent total nitrogen; the accurate aeration system calculates the initial aeration amount required by the oxidation ditch according to the control target; measuring the real-time ammonia nitrogen concentration of the effluent through an ammonia nitrogen on-line measuring instrument arranged at the water outlet end of the oxidation ditch; the accurate aeration system determines the actual air demand according to the control target and the real-time ammonia nitrogen concentration, and adjusts the horizontal shaft surface aeration equipment in combination with the initial aeration quantity to realize the total nitrogen control of the effluent of the oxidation ditch. According to the method, a mathematical model between oxidation ditch effluent total nitrogen and ammonia nitrogen is established, the oxidation ditch effluent total nitrogen is controlled by applying an accurate aeration system, denitrification optimal distribution between secondary treatment and deep treatment is realized, and quality improvement and efficiency improvement of a reclaimed water plant are assisted.

The application relates to the technical field of sewage treatment, and discloses a denitrification oxidation ditch, which comprises a plurality of ring channels, the ring channels are sequentially sleeved from inside to outside, a channel is formed between two adjacent ring channels, the channel is divided into a first channel, a second channel and a third channel, the first channel and the third channel are both communicated with the second channel, the first channel is provided with a water inlet, the third channel is provided with a water outlet one, and the dissolved oxygen concentration ratio of the first channel, the second channel and the third channel is (0.5-1):(0-0.5):(2-3). Through the technical scheme, the problem of low total nitrogen removal efficiency of the outlet water of the Orbal oxidation ditch in the prior art is solved.

The utility model discloses an oxidation ditch activated sludge treatment system, which relates to the technical field of sewage treatment, and comprises a coarse screen and a fine screen, a communicating pipe is fixedly communicated between the coarse screen and the fine screen, a lift pump is fixedly arranged in the middle of the communicating pipe, the water outlet end of the fine screen is communicated with a rotational flow grit chamber, and the water outlet end of the fine screen is communicated with the rotational flow grit chamber. The water outlet end of the rotational flow grit chamber is communicated with a pre-anoxic tank, the water outlet end of the pre-anoxic tank is communicated with an anoxic tank, the water outlet end of the anoxic tank is connected with an oxidation ditch, the other part of effluent of the oxidation ditch enters a secondary sedimentation tank through a water outlet pipe, and mud-water separation is realized in the secondary sedimentation tank through gravity sedimentation; a part of sludge in the secondary sedimentation tank flows back into the anoxic tank through the sludge return pipe, so that microorganisms in the part of sludge are fully utilized, the microbial biomass of a biochemical system can be greatly increased, and the degradation efficiency of unit tank capacity of the biochemical tank on various pollutants is improved.

According to the distributed rural domestic sewage treatment device and method, a plurality of functional areas, an anoxic area, an aerobic area, a membrane separation area and an equipment area are arranged and connected through pipelines or partition plates, and effective treatment of rural domestic sewage is achieved. Through spatial layout, an aerobic zone adopts an oxidation ditch form with large circulation, belongs to a complete mixing type in space and a plug flow type in flow state, does not have a specific sludge backflow facility and a nitrification liquid backflow facility, and utilizes an MBR membrane module to replace a secondary sedimentation tank, so that higher sludge concentration can be maintained, the effluent quality is improved, and the occupied area and investment are saved; the whole system is high in impact resistance, low in power investment and good in effluent quality.

The utility model discloses sludge bulking prevention equipment for an oxidation ditch, which belongs to the technical field of oxidation ditch equipment and particularly comprises an oxidation ditch, an aeration component and a clearing component, the removing assembly comprises an alkaline assembly which is arranged below the oxidation groove and is connected with the oxidation groove through a pipeline, and a scraping assembly which swings in the oxidation groove is arranged above the injection end of the alkaline assembly; the aeration assembly comprises a fixing rod which is arranged above the scraping assembly and is in the horizontal transverse direction, the surface of the fixing rod is sleeved with a plurality of fixing rings, the upper ends and the lower ends of the fixing rings are rotationally connected with rotating rods in the direction perpendicular to the fixing rod, and one end of each rotating rod is rotationally connected with a sleeve plate; the rotating end of the sleeve plate is rotatably connected with a push plate, one end of the push plate is fixedly connected with a double-acting air cylinder, and the surface of the rotating rod is rotatably connected with a swing blade. The swing type sludge water body aeration device can swing sludge water body aeration, improve the sludge treatment effect, and meanwhile can alkalify to reduce sludge formation and prevent sludge bulking.

The utility model discloses an oxidation ditch type A2 / O nitrogen and phosphorus removal device, and relates to the technical field of treatment of water, wastewater, sewage or sludge. An oxidation ditch type A2 / O nitrogen and phosphorus removal device comprises a non-aeration oxidation ditch, an aeration oxidation ditch and a sedimentation tank which are connected through pipelines, and a foam fishing structure which is located on the aeration oxidation ditch and comprises a discharging pipe, a fishing frame, a plurality of fishing plates and a gear ring. The discharging pipe is fixedly connected to the interior of the aeration oxidation ditch, one end of the discharging pipe rotationally extends to the exterior of the aeration oxidation ditch, under the cooperation of the discharging pipe, the salvage frame, the salvage plates, a gear ring and a gear, the salvage frame can drive the multiple salvage plates to salvage foam floating on the sewage surface, and therefore sewage in the salvage plates can be discharged through water filtering holes; and the salvage plate can discharge the salvaged foam into the discharge pipe, so that the foam can be salvaged continuously and effectively.

The utility model relates to an oxidation ditch convenient for sewage treatment, which comprises an oxidation ditch body, a driving device is arranged outside the oxidation ditch body, the driving device comprises a mounting rod, the mounting rod is fixedly mounted on the outer surface of the oxidation ditch body, a threaded rod is rotatably connected inside the mounting rod, and the threaded rod is fixedly connected with the oxidation ditch body. And a driving motor is fixedly mounted on the left side of the mounting rod. According to the oxidation ditch convenient for sewage treatment, a U-shaped frame is controlled to move through an arranged driving device, so that a treatment device on the U-shaped frame is driven to move, an electric sliding rail is matched with a hinge rod to drive a lifting plate to move, so that the treatment device on the lifting plate is driven to move up and down, and then the sewage treatment effect is enhanced through the arranged treatment device; meanwhile, the generated floating foam is treated, and the oxidation ditch body is cleaned, so that the purposes of conveniently treating the sewage, cleaning the generated floating foam and cleaning the device are achieved.

The invention discloses an oxidation ditch type energy-saving carbon-reducing efficient denitrification reaction tank and a sewage treatment method. The reaction tank comprises an anaerobic zone, a first anoxic zone, a first aerobic zone, a second aerobic zone and a second anoxic zone; sewage sequentially flows through the anaerobic zone, the first anoxic zone, the first aerobic zone, the second aerobic zone and the second anoxic zone to be treated, and part of nitrification liquid in the first aerobic zone flows back to the first anoxic zone in the treatment process. The existing oxidation ditch type A2 / O process town sewage treatment plant is transformed, the area of the aerobic zone is reduced, and the reduced aerobic zone is transformed into the second aerobic zone and the second anoxic zone which are connected end to end and circularly flow, so that the consumption of excessive carbon sources in the aerobic stage is avoided, the denitrification performance is improved, and the denitrification efficiency is improved. The aeration energy consumption, external carbon source and indirect carbon emission in the town sewage treatment process are reduced, so that the operation cost of a town sewage treatment plant is reduced.

The present invention relates to a device for transforming an oxidation ditch process based on pre-anoxic denitrification and nitrogen removal and a method for using the same, belonging to the field of sewage treatment. The transformation device comprises a pre-anoxic tank, an oxidation ditch, a secondary sedimentation tank and a double reflux system; by transforming the existing primary sedimentation tank into a pre-anoxic tank or newly building a pre-anoxic tank and simultaneously establishing double sludge reflux and two-stage nitrification liquid reflux to form a two-stage anoxic denitrification system, the anoxic residence time is effectively extended, and the full utilization of the raw water carbon source is realized; and by reasonably distributing the carbon source and effectively controlling the two-stage nitrification liquid reflux ratio, the nitrogen removal and phosphorus removal effects of the oxidation ditch process are improved simultaneously.

The invention discloses a composite biological reaction pool combining an oxidation ditch and an MBR membrane reactor, belongs to the technical field of water treatment, and solves the problem that the oxidation ditch and the MBR membrane reactor are difficult to combine. The invention comprises an anaerobic tank, a pre-anoxic tank, an oxidation ditch tank and an MBR membrane reaction pool, a water outlet is provided at the rear end of the oxidation ditch tank, a membrane pool water inlet channel is connected to the water outlet, an electric regulating weir gate is provided at the connection, a membrane pool return sludge pipe is provided between the MBR membrane reaction pool and the oxidation ditch tank, a sludge storage tank is provided at the side of the sludge collecting channel of the MBR membrane reaction pool, one end of the membrane pool return sludge pipe is provided at the upper end of the sludge storage tank, and the other end is provided between the middle partition wall at the water outlet and the arc-shaped guide wall, a membrane pool return sludge pump is provided on the membrane pool return sludge pipe, an anaerobic pool return sludge pipe is provided between the pre-anoxic tank and the anaerobic tank, and an anaerobic pool return sludge pump is provided on the anaerobic pool return sludge pipe. The invention realizes a good combination of the oxidation ditch and the MBR membrane reactor, and has a good water treatment effect.

The utility model belongs to the technical field of sewage treatment devices, and in particular, is an oxidation ditch structure for sewage treatment, including a primary oxidation ditch, a secondary oxidation ditch and a tertiary oxidation ditch, wherein the primary oxidation ditch, the secondary oxidation ditch and the tertiary oxidation ditch are arranged in sequence from the outside to the inside, and a central water pool is arranged on the inner side of the tertiary oxidation ditch, and the primary oxidation ditch, the secondary oxidation ditch, the tertiary oxidation ditch and the central water pool are separated by a partition wall, and the primary oxidation ditch, the secondary oxidation ditch and the tertiary oxidation ditch are all fixed with a barrier wall for blocking water flow, and the end of the barrier wall is fixed on the corresponding partition wall. The utility model arranges a plurality of oxidation ditches in stages, and the oxidation treatment effect of sewage increases in sequence, which can effectively improve the treatment effect of sewage, and the guide plate of the device can be disassembled and assembled, which is convenient for cleaning, solving the problem that the sewage treatment effect of the current device is not ideal and the guide plate is inconvenient to clean.

The utility model relates to the technical field of sewage treatment, in particular to oxidation ditch pool surface scum cleaning and collecting equipment which comprises an oxidation ditch pool body with a liquid guide pipe arranged at the middle end of the bottom, and a plurality of supporting sleeves distributed at equal intervals are fixedly connected to the left end of the bottom of the inner side of the oxidation ditch pool body. A rotating rod is movably connected to the middle end of the top of the supporting sleeve through a bearing, guiding sliding grooves are formed in the left side and the right side of the upper end of the rotating rod, a fixing sleeve is slidably connected to the upper end of the outer surface of the rotating rod, and limiting sliding blocks sliding in the guiding sliding grooves are fixedly connected to the left side and the right side of the lower end of an inner cavity of the fixing sleeve. Under the action of the guide vanes, the collecting and deslagging seat, the guide floating disc, the fixed sleeve, the rotating rod and the floating sleeve, the collecting equipment has the advantages of simplicity in cleaning and low use cost, and solves the problems that scum on the pool surface of an existing oxidation ditch is very complicated to clean, the cleaning cost is higher, and inconvenience is brought to manufacturers.