Integrated sewage treatment equipment with nitration liquid reflux enhancement

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a kind of integrated equipment for sewage using nitrification liquid backflow to enhance, the equipment includes pedestal and its above treatment assembly, and anaerobic, anoxic and aerobic pool are separated in treatment box by the baffle with flow guide groove;Its core improvement is in the dynamic aeration structure of aerobic pool: driving motor is rotated by gas slip ring and drives rotating pipe, and the middle part of pipe body is net cage and is equipped with poking plate;When blast air escapes from net cage, it is cut into fine bubble by the rotating poking plate, thereby greatly improving oxygen mass transfer efficiency;At the same time, equipment is backflowed to anoxic pool by suction pump, and nitrification liquid of aerobic pool is provided for denitrification reaction substrate, and denitrification effect is strengthened;Anaerobic tank and anoxic tank are equipped with stirring device to keep sludge suspended;The utility model effectively improves nitrogen removal efficiency and system operation stability by the synergy of efficient aeration and nitrification liquid backflow.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an integrated wastewater treatment equipment that utilizes nitrification liquid recirculation to enhance wastewater treatment. Background Technology

[0002] In biological wastewater treatment, nitrogen removal is a key step in achieving water quality standards, and nitrification liquor recirculation technology is a core means to enhance nitrogen removal efficiency. Developed from the traditional activated sludge process, biological nitrogen removal processes require the recirculation of nitrates generated in an aerobic environment to an anoxic zone, providing substrates for denitrifying bacteria and thus completing the conversion of nitrogen from the liquid phase to the gaseous phase. The significance of integrated equipment lies in integrating anaerobic, anoxic, and aerobic multifunctional units into a compact space. Through internal flow optimization and functional synergy, it achieves efficient integration and energy consumption control of the wastewater treatment process, making it particularly suitable for land-constrained or decentralized wastewater treatment scenarios. Its synergistic removal capacity for nitrogen and phosphorus pollutants directly relates to the ecological safety of the receiving water body.

[0003] In wastewater treatment, aeration equipment is typically used to supplement air in aerobic tanks. Current technologies mostly employ fixed aeration heads or perforated pipe aeration systems, with a blower providing the air source. Air diffuses through the tiny pores on the surface of the aerator to form bubbles, which then contact the mixed liquid during their ascent to complete oxygen transfer. This type of aeration relies on air pressure to overcome the hydrostatic pressure and pore resistance of the water. After being generated, the bubbles float along their natural path, and their distribution range and residence time are affected by the density of the aerators and the hydraulic conditions of the tank. To maintain the dissolved oxygen concentration, a continuous supply of compressed air is required, and the aeration intensity must be adjusted to meet the oxygen requirements of nitrifying bacteria.

[0004] However, existing aeration methods suffer from short bubble residence time and limited mass transfer efficiency. Due to the large bubble size and rapid rise of the generated bubbles, the gas-liquid two-phase contact area is limited, and oxygen escapes into the atmosphere before it can fully dissolve, resulting in low oxygen transfer efficiency. To maintain the dissolved oxygen level required by the process, it is often necessary to increase the output pressure and volume of the blower, which not only increases energy consumption but also aggravates equipment operating noise and maintenance frequency. In addition, large bubbles have a weak disturbance effect on the mixed liquor, and sludge deposition or oxygen-deficient dead zones are prone to occur in local areas, affecting the overall stability of the biological system. Insufficient bubble density further limits the mass transfer efficiency of pollutants and microorganisms, becoming a technical bottleneck for improving the nitrification efficiency of aerobic tanks. Utility Model Content

[0005] The purpose of this invention is to provide an integrated wastewater treatment equipment that enhances nitrification by recirculating nitrification liquid. This solves the problems of low oxygen transfer efficiency caused by the large bubble size, fast rising speed, and limited gas-liquid contact area generated by the aeration method in the aerobic tank in the prior art, as well as the high energy consumption and high operating noise caused by the need to increase the output pressure and air volume of the blower unit to maintain the dissolved oxygen concentration. At the same time, it improves the phenomenon of local sludge deposition or oxygen-deficient dead zones that may be caused by insufficient bubble density and weak disturbance ability, thereby improving the nitrification reaction efficiency of the aerobic tank and the stability of system operation.

[0006] To achieve the above objectives, this utility model provides a base, with a processing assembly bolted to the top of the base. The processing assembly includes a processing box, inside which two vertical partitions are fixedly installed. A flow guide channel is formed below each partition. The processing box forms an aerobic pool, an anoxic pool, and an anaerobic pool through the partitions. Two inclined support blocks are fixedly installed on one side of the processing box, opposite the aerobic pool. Drive motors are bolted to the top of each inclined support block. The output shafts of the drive motors are connected to rotating tubes via air slip rings. The rotating tubes are mounted inside the aerobic pool via bearings. A mesh cage is located in the middle of each rotating tube, and several actuating plates are spaced apart on the outside of the mesh cage.

[0007] The bottom of the processing box is fixedly installed with a fixing plate, and several diagonal bracing plates are installed at intervals at the connection angle between the fixing plate and the processing box. The fixing plate is installed on the top of the base by bolts.

[0008] A discharge connector is installed through one side of the treatment tank and between the inclined support blocks, and a suction pump is installed on the other side of the treatment tank and opposite to the aerobic tank by bolts.

[0009] The suction end of the suction pump extends through a pipe into the aerobic tank, and the pumping end of the suction pump extends through a pipe into the anoxic tank.

[0010] The top of the treatment tank is bolted to the opposite positions of the anoxic tank and the anaerobic tank, and a rotating motor is bolted to the top of the support plate.

[0011] The output end of the rotating motor is provided with a rotating shaft, which passes through the bottom end of the support plate and extends into the anoxic tank and the anaerobic tank. Several stirring rods are installed at intervals on both sides of the rotating shaft.

[0012] This utility model discloses an integrated wastewater treatment device that utilizes nitrification liquor recirculation to enhance the treatment process. It includes a base and a treatment assembly bolted to the top of the base. The treatment assembly centers on a treatment tank, which is divided into three reaction zones—an anaerobic tank, an anoxic tank, and an aerobic tank—by two vertical partitions. A guide channel beneath the partitions facilitates the orderly flow of the mixed liquor between the tanks. A diagonal support block is installed on one side of the treatment tank opposite the aerobic tank. A drive motor is bolted to the top of the diagonal support block, and the output of the drive motor is connected to a rotating pipe via a slip ring. The rotating pipe is supported inside the aerobic tank by bearings. The middle section of the rotating pipe is designed as a mesh cage structure, with several actuating plates installed at intervals on the outer side of the mesh cage. When the device is running, the drive motor rotates the rotating pipe. Gas supplied by a blower enters the rotating pipe through the slip ring and escapes through the mesh cage openings. Simultaneously, the actuating plates continuously cut and break up air bubbles as the rotating pipe rotates, refining and dispersing the bubbles throughout the mixed liquor. This structure extends the bubble residence time and increases the gas-liquid contact area through dynamic rotating aeration, thereby improving oxygen mass transfer efficiency, helping to reduce energy consumption and the risk of sludge deposition, and overcoming the problem of limited oxygen transfer efficiency caused by large bubble particle size and fast rising speed in traditional aeration methods. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the processing component in an embodiment of this utility model.

[0016] Figure 3 This is a schematic diagram of the support plate in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the planar structure of the processing box according to an embodiment of the present invention.

[0018] In the diagram: 101, base; 102, treatment component; 103, treatment box; 104, partition; 105, aerobic tank; 106, anoxic tank; 107, anaerobic tank; 108, inclined support block; 109, drive motor; 110, air slip ring; 111, rotating pipe; 112, wire mesh cage; 113, actuating plate; 114, fixing plate; 115, inclined support plate; 116, discharge connector; 117, suction pump; 118, support plate; 119, rotating motor; 120, rotating shaft; 121, stirring rod; 122, guide channel. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] As attached Figures 1 to 4 As shown, an integrated wastewater treatment device utilizing nitrification liquor recirculation includes a base 101 serving as the overall support structure. A treatment component 102 is bolted to the top of the base 101. The core of the treatment component 102 is a treatment tank 103. Two vertical partitions 104 are fixedly installed inside the treatment tank 103, dividing the inner cavity into three continuous reaction zones: an anaerobic tank 107, an anoxic tank 106, and an aerobic tank 105. A guide channel 122 below the partitions 104 enables the orderly serial flow of the mixed liquor between the tanks. A fixing plate 114 is welded to the bottom of the treatment tank 103. Several diagonal bracing plates 115 reinforce the angle between the fixing plate 114 and the treatment tank 103, enhancing structural stability. The fixing plate 114 is bolted to the top of the base 101 for overall fixation.

[0021] Two inclined support blocks 108 are fixedly installed on one side of the treatment tank 103, opposite to the aerobic tank 105. A drive motor 109, bolted to the top of the inclined support blocks 108, is connected to an air slip ring 110 via its output shaft. The air slip ring 110 is connected to a rotating tube 111, horizontally placed inside the aerobic tank 105 and supported by bearings. The middle section of the rotating tube 111 is designed as a mesh cage 112 structure. Several actuating plates 113, spaced apart on the outside of the mesh cage 112, form a dynamic aeration unit when rotating. The blower output is connected to the air slip ring 110. Gas continuously flows through the air slip ring 110 into the rotating tube 111 and escapes from the gaps in the mesh cage 112. When the drive motor 109 drives the rotating tube 111 to rotate, the actuating plates 113 rotate synchronously, continuously cutting and breaking up the bubbles to refine and disperse them. This significantly increases the gas-liquid contact area, effectively improving oxygen dissolution efficiency and utilization, creating a highly efficient aerobic environment for nitrification.

[0022] A support plate 118 is bolted to the top of the treatment tank 103, corresponding to the positions of the anoxic tank 106 and the anaerobic tank 107. A rotating motor 119, bolted to the top of the support plate 118, drives the rotating shaft 120 to rotate. Several stirring rods 121, which are installed at intervals on both sides of the rotating shaft 120, which extends through the anoxic tank 106 and the anaerobic tank 107, continuously stir the mixed liquid, ensuring that the sludge is suspended and in full contact with the wastewater. An anaerobic environment is created in the anaerobic tank 107 to promote phosphorus release by polyphosphate-accumulating bacteria, and an anaerobic conditions are formed in the anoxic tank 106 to drive denitrification. A suction pump 117, bolted to one side of the treatment tank 103 opposite the aerobic tank 105, has its suction end extending through a pipe into the deep liquid layer inside the aerobic tank 105, and its pumping end connected through a pipe to the front end of the anoxic tank 106. During operation, it continuously draws and transports the nitrate-rich nitrified liquid from the aerobic tank 105 to the anoxic tank 106, replenishing the necessary reaction substrate for denitrifying bacteria and enhancing the removal of nitrogen pollutants. The treated mixture is finally discharged from the system through a discharge connector 116 installed between the inclined support blocks 108 on the width side of the treatment tank 103, completing the wastewater purification process. This equipment, through the structural coordination and functional linkage of its components, achieves an organic combination of enhanced nitrification denitrification via nitrified liquid recirculation and efficient aeration, ensuring a stable improvement in wastewater treatment efficiency.

[0023] Working principle: Wastewater is transported to the anaerobic tank 107 formed by the partition 104 inside the treatment tank 103. At this time, the rotating motor 119 installed at the top of the support plate 118 starts, driving the rotating shaft 120 and the stirring rods 121 installed on both sides to rotate, which fully stirs the mixed liquid in the anaerobic tank 107. This operation ensures uniform contact between sludge and wastewater and creates a strict anaerobic environment, which is conducive to the phosphorus release reaction of microorganisms. The mixed wastewater is pushed by fluid pressure and flows naturally into the adjacent anoxic tank 106 through the guide channel 122 located below the partition 104.

[0024] After entering the anoxic tank 106, another set of stirring rods 121, driven by a rotating motor 119, continues to agitate the mixture, maintaining an anoxic state to promote denitrification. Simultaneously, a suction pump 117 installed along the length of the treatment tank 103 begins operation. Its suction end pipe draws nitrate-rich nitrified liquor from the end of the aerobic tank 105 and transports it to the front of the anoxic tank 106 through the pumping end pipe. This nitrified liquor recirculation process replenishes the anoxic tank 106 with the electron acceptors necessary for denitrification, enhancing nitrogen removal.

[0025] Wastewater then enters the aerobic tank 105 via the guide channel 122 below another baffle 104. The aerobic tank 105 is the core component of the entire system. The output end of the blower is connected to the air slip ring 110, and the gas enters the rotating pipe 111 that runs through the aerobic tank 105 via the air slip ring 110. The drive motor 109, which is fixedly installed on the top of the inclined support block 108 on the outside of the aerobic tank 105, starts and drives the rotating pipe 111 and the mesh cage 112 on it to rotate together through the output shaft. The gas escapes from the gaps in the mesh cage 112 of the rotating pipe 111, forming fine bubbles. At the same time, the actuating plate 113, which is fixed to the outside of the mesh cage 112, rotates with the rotating pipe 111, continuously cutting and breaking the bubbles during the rotation process, making the bubbles smaller and more densely distributed. This effect significantly increases the gas-liquid contact area and prolongs the residence time of the bubbles in the water, thereby greatly improving the oxygen transfer efficiency and utilization rate, creating a highly efficient aerobic environment for the nitrification reaction.

[0026] The aerobic-treated mixed liquor is finally discharged through the discharge connector 116 installed on the wide side of the treatment tank 103. The structural stability of the entire equipment is ensured by the fixing plate 114 and several diagonal bracing plates 115 connecting the treatment tank 103 and the fixing plate 114, while the treatment tank 103 is firmly installed on the top of the base 101 by the fixing plate 114. Through the physical separation of the partition plate 104, the orderly guidance of the flow guide channel 122, the stirring action driven by the rotating motor 119, the rotary aeration driven by the drive motor 109, and the nitrification liquor return achieved by the suction pump 117, the equipment synergistically achieves the effective separation of anaerobic, anoxic, and aerobic environments and the enhancement of the reaction process, ultimately achieving the efficient removal of organic matter and nitrogen from wastewater.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An integrated wastewater treatment equipment utilizing nitrification liquor recirculation, comprising a base (101), characterized in that: The base (101) is bolted to the top of a processing assembly (102). The processing assembly (102) includes a processing box (103). Two vertical partitions (104) are fixedly installed inside the processing box (103). A guide channel (122) is opened below the partitions (104). The processing box (103) forms an aerobic pool (105), an anoxic pool (106), and an anaerobic pool (107) through the partitions (104). The width of the processing box (103) is connected to the aerobic pool. (105) Two inclined support blocks (108) are fixedly installed at opposite positions. The top of each inclined support block (108) is equipped with a drive motor (109) by bolts. The output shaft of the drive motor (109) is connected to the rotating tube (111) by air slip ring (110). The rotating tube (111) is installed inside the aerobic tank (105) by bearings. The middle of the rotating tube (111) is a net cage (112). Several actuating plates (113) are installed at intervals on the outside of the net cage (112).

2. The integrated wastewater treatment equipment utilizing nitrification liquor recirculation as described in claim 1, characterized in that: A fixing plate (114) is fixedly installed at the bottom of the processing box (103). Several diagonal bracing plates (115) are installed at intervals at the connection angle between the fixing plate (114) and the processing box (103). The fixing plate (114) is installed on the top of the base (101) by bolts.

3. The integrated wastewater treatment equipment utilizing nitrification liquor recirculation as described in claim 2, characterized in that: A discharge connector (116) is installed through one side of the width of the treatment box (103) and between the diagonal bracing blocks (108). A suction pump (117) is installed by bolts on one side of the length of the treatment box (103) opposite to the aerobic tank (105).

4. The integrated wastewater treatment equipment utilizing nitrification liquor recirculation as described in claim 3, characterized in that: The suction end of the suction pump (117) is connected to the interior of the aerobic tank (105) through a pipe, and the pumping end of the suction pump (117) is connected to the interior of the anoxic tank (106) through a pipe.

5. The integrated wastewater treatment equipment utilizing nitrification liquor recirculation as described in claim 4, characterized in that: The top of the treatment tank (103) is respectively bolted to the opposite positions of the anoxic tank (106) and the anaerobic tank (107), and a rotating motor (119) is bolted to the top of the support plate (118).

6. The integrated wastewater treatment equipment utilizing nitrification liquor recirculation as described in claim 5, characterized in that: The output end of the rotating motor (119) is provided with a rotating shaft (120). The rotating shaft (120) passes through the bottom end of the support plate (118) and extends into the anoxic tank (106) and the anaerobic tank (107). Several stirring rods (121) are installed at intervals on both sides of the rotating shaft (120).

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