Aerobic sludge modification system for sewage in-situ biochemical system

Abstract

The utility model discloses an aerobic sludge modification system for a sewage in-situ biochemical system. The aerobic sludge modification system comprises a hydraulic slag removal tank, a mechanical slag remover, a sludge conditioning and sorting device connected with the hydraulic slag removal tank, a heavy sludge buffer tank connected with the mechanical slag remover and the sludge conditioning and sorting device. According to the utility model, after the activated sludge subjected to biochemical treatment of sewage is subjected to slag removal, suspended impurity crushing and sludge density separation, light aged sludge with low density is discharged to a sludge dewatering system as residual sludge, and heavy activated sludge with high density is sent back to a biochemical treatment system for cyclic enrichment; according to the method, flocculent activated sludge is subjected to multi-strain multi-enzyme synergistic co-metabolism modification, aerobic granular sludge is formed in a biochemical system, so that multi-strain multi-enzyme synergistic co-metabolism modification of the flocculent activated sludge is realized, the activity of the sludge is improved, and finally the purposes of reducing the discharge amount of residual sludge, improving the volume load of an aerobic treatment system and enhancing the phosphorus removal effect are realized.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an aerobic sludge modification system for in-situ biochemical wastewater systems. Background Technology

[0002] Aerobic biological wastewater treatment is a method that, under the premise of providing free oxygen, primarily uses aerobic microorganisms to degrade and stabilize organic matter, resulting in harmless treatment. Bacteria, microorganisms, and other microorganisms, along with suspended solids and other impurities in the wastewater, mix together to form a flocculent mass with strong adsorption and decomposition capabilities—activated sludge. This sludge contains various microorganisms in stasis, logarithmic, stationary, and aging phases. Existing wastewater treatment plants discharge excess sludge directly from the sedimentation tank of the biological treatment system. This sludge is homogeneous with the returned sludge from the biological treatment system, containing various microorganisms in stasis, logarithmic, stationary, and aging phases, and is considered indiscriminate discharge. Aging sludge has poor adsorption and decomposition capabilities for organic matter, is lightweight and has poor settling properties, and occupies a relatively stable proportion within the biological treatment system, resulting in low overall activity of the activated sludge, low wastewater treatment efficiency, and high treatment costs. Therefore, it is necessary to optimize and modify the flocculent activated sludge in the in-situ wastewater treatment biochemical system, adjust its ecological niche, add inert carrier packing, and change the density of microorganisms at different life stages. Sludge in its aging stage has the weakest adsorption capacity and the lowest density, making it easier to be screened out of the activated sludge and discharged as excess sludge. Microorganisms in other life stages have strong adsorption capacity and relatively high density, and are screened and retained as heavy activated sludge, which is then returned to the in-situ biochemical system for recycling and enrichment. The heavy sludge, guided by the carrier packing as an inducing core, gradually granulates within the in-situ biochemical system under hydraulic shear and other effects, forming a new activated sludge mainly composed of aerobic granular sludge. This improves wastewater treatment efficiency, reduces excess sludge discharge, saves energy, and lowers wastewater treatment costs. Utility Model Content

[0003] The purpose of this invention is to provide an aerobic sludge modification system for in-situ biochemical wastewater treatment systems, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an aerobic sludge modification system for in-situ wastewater biochemical systems, comprising...

[0005] A hydraulic sludge removal tank is used to remove sludge, such as sand and small stones, from flocculent activated sludge from a wastewater treatment biochemical system.

[0006] A mechanical slag remover is connected to a hydraulic slag remover tank. The mechanical slag remover is used to crush large, light, suspended impurities in the activated sludge after slag removal in the hydraulic slag remover tank.

[0007] The sludge conditioning and sorting device is connected to the mechanical slag remover. The sludge conditioning and sorting device is used to perform density screening on the activated sludge after it has been crushed by the mechanical slag remover, and to separate the heavy activated sludge with high density, the aged sludge with low density, and the crushed light suspended impurities. It also has the functions of adjusting the discharge of heavy sludge and air backwashing to prevent clogging.

[0008] A heavy sludge buffer tank is connected to a sludge conditioning and sorting device. The heavy sludge buffer tank is used to receive and temporarily store the heavy sludge separated and retained by the sludge conditioning and sorting device, and to provide a certain level fluctuation buffer for the operation of the heavy sludge lift pump.

[0009] Preferably, it also includes

[0010] The anaerobic tank, anoxic tank, aerobic tank, secondary sedimentation tank, and secondary sedimentation tank sludge well are connected in series.

[0011] The sludge well of the secondary sedimentation tank is then connected to the anaerobic tank, the anoxic tank, and the aerobic tank.

[0012] The sludge well in the secondary sedimentation tank is connected to the hydraulic sludge removal tank via a sludge lifting pump.

[0013] In any of the above embodiments, it is preferred that the heavy sludge buffer tank is connected to the anaerobic tank, anoxic tank, and aerobic tank via a heavy sludge lift pump, and the heavy sludge lift pump lifts the heavy sludge back to the anaerobic tank, anoxic tank, and / or aerobic tank of the wastewater treatment in-situ biological system for recycling and enrichment.

[0014] Preferably, any of the above schemes further includes a packing material addition trolley connected to a heavy sludge buffer tank. The carrier packing material trolley is used to add the carrier packing material to the in-situ biological treatment system of the wastewater treatment system, providing an induction nucleus for the flocculent sludge in the in-situ biological treatment system, increasing the sludge density and playing a coagulation role. The carrier packing material can be a coagulant, such as micro sand or activated carbon.

[0015] Preferably, in any of the above embodiments, the sludge conditioning and sorting device includes:

[0016] The hydrocyclone separator and its external casing are provided. The hydrocyclone separator is used to perform hydrocyclone shearing on the sludge from the secondary sedimentation tank of the wastewater treatment biological system, stripping away microorganisms that are not tightly attached to the aerobic granular sludge, promoting the growth of loose small granular sludge into heavy granular sludge, conditioning and sorting the microbial community at different life stages in the sludge from the secondary sedimentation tank, retaining the carrier packing material and heavy granular sludge that have disintegrated from the granular sludge, and sorting out the light, aged sludge with low density. The external casing provides an air backwash sealing container for the hydrocyclone separator, used for air backwashing of the sludge inlet, upper sludge outlet and lower sludge outlet of the hydrocyclone separator, removing large suspended solids that clog the separator, and effectively solving the clogging problem of the hydrocyclone separator.

[0017] The sludge feed header, lower sludge discharge header, upper sludge discharge header, and compressed air header are installed on the outer casing as external connection lines.

[0018] Preferably, a sludge inlet control valve is installed on the sludge inlet header.

[0019] In any of the above embodiments, it is preferred that a sludge discharge control valve is installed on the sludge discharge header.

[0020] In any of the above embodiments, it is preferred that an upper sludge discharge control valve is installed on the upper sludge discharge header.

[0021] In any of the above embodiments, it is preferred that a backwash intake control valve is installed on the compressed air header.

[0022] The sludge inlet control valve, upper sludge outlet control valve, lower sludge outlet control valve, and backwash air inlet control valve are used for the time-sequential interlocking air backwashing of the sludge conditioning and separating device.

[0023] Preferably, any of the above-mentioned solutions also includes a pressure gauge, which is installed on the outer casing and is used to monitor the backwash pressure of the sludge conditioning and sorting device.

[0024] This invention discloses an aerobic sludge modification system for in-situ wastewater biochemical systems. After removing slag, crushing suspended impurities, and separating sludge density from the activated sludge following wastewater biochemical treatment, the lighter, aged sludge with lower density is discharged as excess sludge to the sludge dewatering system. The denser, heavier activated sludge is returned to the biochemical treatment system for recycling and enrichment, forming aerobic granular sludge within the system. This achieves multi-species, multi-enzyme synergistic co-metabolic modification of the flocculent activated sludge, improving sludge activity, ultimately reducing excess sludge discharge, increasing the volumetric load of the aerobic treatment system, and enhancing phosphorus removal efficiency.

[0025] This invention relates to a sludge conditioning and sorting device for secondary sedimentation tanks in in-situ biological treatment systems for wastewater. It addresses the issue of sludge buildup in secondary sedimentation tanks after wastewater biological treatment. The device utilizes hydraulic cyclone shearing to remove loosely attached microorganisms from aerobic granular sludge, promoting the growth of loose small granular sludge into heavy granular sludge. It also conditions and sorts microbial communities at different lifecycles within the sedimentation sludge, retaining carrier packing material and heavy granular sludge that have disintegrated from the granular sludge, and separating low-density, light, aged sludge. The carrier packing material and heavy granular sludge are discharged from the sludge conditioning and sorting device via a lower sludge discharge pipe, while the light, aged sludge is discharged via an upper sludge discharge pipe. This invention achieves time-controlled air backwashing by incorporating sludge inlet control valves, upper sludge discharge control valves, lower sludge discharge control valves, and backwash air inlet control valves, effectively solving the clogging problem of hydraulic cyclone separators. This utility model requires little investment and is flexible in application. Depending on the applicable scenario, it can be used independently or in combination with other equipment, and multiple units can be connected in parallel.

[0026] The technical effects and advantages of this utility model are as follows: 1. The system of this utility model can be externally coordinated with the in-situ biological treatment system of sewage treatment. It has a small footprint, low investment, does not change the process route of the existing in-situ biological treatment system and sludge dewatering system of sewage treatment plant, has a short construction period and quick results, and can form granular sludge within 2 weeks.

[0027] 2. The system of this utility model has a wide range of applications and is suitable for biochemical treatment systems of various chemical wastewater and domestic sewage;

[0028] 3. The system of this utility model is applicable to AAO and AO combined processes, and is also applicable to the biochemical reduction of activated sludge in wastewater biochemical treatment systems with independent aerobic treatment processes.

[0029] 4. The system of this utility model has strong resistance to load shocks and can maintain the efficient and stable operation of the in-situ biological treatment system for wastewater under conditions of large fluctuations in hydraulic load and / or organic load.

[0030] 5. The system of this utility model can remove phosphorus efficiently, achieve near-zero addition of phosphorus removal agent, and save more than 80% of phosphorus removal agent;

[0031] 6. The system of this utility model can realize the transformation of flocculent activated sludge in the in-situ biological system into activated sludge mainly composed of aerobic granular sludge. The sludge has high activity, which increases the volumetric load of the in-situ biological system by 30-50%. It can be applied to existing sewage treatment plants with in-situ capacity expansion needs.

[0032] 7. The system of this utility model can reduce the amount of residual sludge in the in-situ biochemical system, and reduce the amount of oven-dried sludge by 30-50%. Attached Figure Description

[0033] Figure 1 This is a structural and working principle diagram of the present invention;

[0034] Figure 2 This is a schematic diagram illustrating the structural principle of the sludge conditioning and sorting device of this utility model.

[0035] In the diagram: 101, Anaerobic tank; 201, Anoxic tank; 301, Aerobic tank; 401, Secondary sedimentation tank; 402, Secondary sedimentation tank sludge well; 501, Thickening tank; 601, Sludge lift pump; 602, Hydraulic sludge removal tank; 603, Mechanical sludge removal machine; 604, Sludge conditioning and sorting device; 605, Heavy sludge buffer tank; 606, Heavy sludge lift pump; 607, Air compressor; 608, Packing material feeding trolley; 1, Sludge feed header; 2, Lower sludge discharge header; 3, Upper sludge discharge header; 4, Compressed air header; 5, External casing; 6, Hydrocyclone separator; 7, Sludge inlet control valve; 8, Lower sludge discharge control valve; 9, Upper sludge discharge control valve; 10, Backwash air inlet control valve; 11, Pressure gauge. Detailed Implementation

[0036] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0039] This utility model provides, for example Figure 1-2The aerobic sludge modification system for in-situ biological treatment of wastewater shown includes a sludge lift pump 601, a hydraulic sludge removal tank 602, a mechanical sludge removal machine 603, a sludge conditioning and sorting device 604, a heavy sludge buffer tank 605, a heavy sludge lift pump 606, an air compressor 607, a packing material feeding trolley 608, an anaerobic tank 101, an anoxic tank 201, an aerobic tank 301, a secondary sedimentation tank 401, a secondary sedimentation tank sludge well 402, and a thickener 501.

[0040] Mechanical slag remover 603 is connected to hydraulic slag remover 602; sludge conditioning and sorting device 604 is connected to mechanical slag remover 603; heavy sludge buffer tank 605 is connected to sludge conditioning and sorting device 604; heavy sludge buffer tank 605 is connected to anaerobic tank 101, anoxic tank 201, and aerobic tank 301 via heavy sludge lift pump 606.

[0041] Anaerobic tank 101, anoxic tank 201, aerobic tank 301, secondary sedimentation tank 401 and secondary sedimentation tank sludge well 402 are connected in series. The secondary sedimentation tank sludge well 402 is then connected to anaerobic tank 101, anoxic tank 201 and aerobic tank 301. The secondary sedimentation tank sludge well 402 is connected to hydraulic sludge removal tank 602 through sludge lifting pump 601.

[0042] The sludge lift pump 601 lifts the flocculent activated sludge from the sludge well 402 of the secondary sedimentation tank of the in-situ biological treatment system of the sewage treatment plant to the hydraulic sludge removal tank 602 for sludge removal treatment, separating the inorganic particles such as mud and sand accumulated in the in-situ biological system, and using the system pressure difference, it is discharged to the in-situ sludge thickening tank 501 and the hydraulic sludge removal tank 602 through the light aged sludge (residual sludge) pipeline.

[0043] The mechanical sludge remover 603 receives activated sludge from the hydraulic sludge remover 602 after the separation of inorganic particles such as mud and sand. It crushes the large light suspended impurities still carried in the sludge into small flocculent suspended impurities, reducing the burden of subsequent process blockage, which is conducive to the stable operation of integrated equipment and reduces the intensity of maintenance and repair work.

[0044] The heavy sludge storage tank 605 is used to temporarily store and buffer the sludge conditioning and sorting device 604, which separates and retains the high-density, large-particle activated sludge, providing continuous and stable operating conditions for the heavy sludge lift pump. The heavy sludge lift pump 606 is used to lift the high-density aerobic granular sludge from the heavy activated sludge storage tank 605 back to the anaerobic tank 101, anoxic tank 201, and aerobic tank 301 of the in-situ biological treatment system for wastewater treatment.

[0045] The carrier packing trolley 608 is used to add the carrier packing to the in-situ biological treatment system for wastewater treatment, providing induction nuclei for flocculent sludge in the in-situ biological treatment system, increasing sludge density and playing a coagulation role. The carrier packing can be a coagulant, such as micro sand or activated carbon.

[0046] Secondary sedimentation tank 401 is used for sedimentation and separation of the sludge-water mixture after biological treatment. The sludge obtained from sedimentation is collected in secondary sedimentation tank sludge well 402. Most of the secondary sedimentation sludge is transported as external return sludge to the anaerobic tank 101, anoxic tank 201, and aerobic tank 301 of the in-situ biological treatment system for sewage treatment. A small portion is lifted by sludge lift pump 601 and sent to the external collaborative skid-mounted integrated aerobic sludge modification system. Heavy sludge is lifted and sent to the anaerobic tank 101, anoxic tank 201, and aerobic tank 301 of the in-situ biological treatment system for sewage treatment. A small amount of mud and sand separated from the hydraulic sludge removal tank, light small-particle aged sludge separated from the sludge conditioning and sorting device 604, and a small amount of crushed suspended impurities enter the thickening tank 501 for thickening and dewatering treatment.

[0047] The sludge conditioning and sorting device includes a sludge feed header 1, a lower sludge discharge header 2, an upper sludge discharge header 3, a compressed air header 4, an outer casing 5, a hydrocyclone separator 6, a sludge feed control valve 7, a lower sludge discharge control valve 8, an upper sludge discharge control valve 9, a backwash air intake control valve 10, and a pressure gauge 11.

[0048] The outer casing 5 is located outside the hydrocyclone separator 6 and is sealed, providing a sealed container for air backwashing of the hydrocyclone separator 6.

[0049] The sludge feed header 1, lower sludge discharge header 2, upper sludge discharge header 3, and compressed air header 4 are external connecting pipes of the sludge sorting and classifying device, which are connected to the outer casing 5. A sludge inlet control valve 7, a lower sludge discharge control valve 8, an upper sludge discharge control valve 9, and a backwash air inlet control valve 10 are respectively installed on the sludge feed header 1, lower sludge discharge header 2, upper sludge discharge header 3, and compressed air header 4.

[0050] Pressure gauge 11, installed on the outer casing 5, monitors the backwashing operation pressure and provides operating pressure parameters for the commissioning and operation of the sludge sorting and conditioning unit's backwashing.

[0051] The sludge from the secondary sedimentation tank is fed through the inlet sludge header 1, flows through the inlet sludge control valve 7, and enters the hydrocyclone separator 6. Utilizing the shearing action of the hydrocyclone, microorganisms that are not tightly attached to the aerobic granular sludge are separated, promoting the growth of loose small granular sludge into heavy granular sludge. The carrier packing material and heavy granular sludge that have detached from the granular sludge are retained, and the low-density, light, aged sludge is separated. The carrier packing material and heavy granular sludge flow through the lower sludge discharge control valve 8 and enter the lower sludge header 2 to be discharged back into the on-site biological treatment system. The light, aged sludge flows through the upper sludge discharge control valve 9 and enters the upper sludge header 3, being discharged from the on-site biological treatment system as excess sludge. The internal hydrocyclone separator 6 separates activated sludge particles of different sizes (small granular sludge particles less than 150μm, large particles ≥150μm).

[0052] A backwash air compressor is provided as a supporting component. The backwash air compressor is installed on the outer casing 5 to perform backwashing, preventing clogging of the sludge conditioning and sorting device, promoting stable operation of the integrated equipment, and reducing maintenance workload. Backwashing is scheduled once every 6 hours. Specifically, backwashing is first performed at the lower sludge discharge port by closing the sludge inlet control valve 7 and the upper sludge discharge control valve 9, while keeping the lower sludge discharge control valve 8 open. Then, the backwash air inlet control valve 10 is opened to perform a 15-second backwash at the lower sludge discharge port. For the upper sludge discharge port, backwashing is performed by opening the upper sludge discharge control valve 9 and closing the lower sludge discharge control valve 8. Sludge discharge control valve 8 and sludge inlet control valve 7 remain closed, while backwash air inlet control valve 10 remains open. Backwash the upper sludge discharge port with air for 15 seconds. For air backwashing the sludge inlet, open sludge inlet control valve 7, close upper sludge discharge control valve 9, keep lower sludge discharge control valve closed, and keep backwash air inlet control valve 10 open. Backwash the sludge inlet with air for 15 seconds. Close backwash air inlet control valve 10, open lower sludge discharge control valve 8 and upper sludge discharge control valve 9, and keep sludge inlet control valve 7 open. Air backwashing ends, and the system automatically switches to working state.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An aerobic sludge modification system for use in a wastewater in-situ biological system, characterized by: Comprising a hydraulic deslagging tank (602); a mechanical deslagging machine (603) connected with the hydraulic deslagging tank (602); a sludge conditioning and sorting device (604) connected with the mechanical deslagging machine (603); a heavy sludge buffer tank (605) connected with the sludge conditioning and sorting device (604).

2. The system for modifying the activated sludge of a wastewater in-situ biological system according to claim 1, characterized in that: Further comprising an anaerobic tank (101), an anoxic tank (201), an aerobic tank (301), a secondary sedimentation tank (401) and a secondary sedimentation tank sludge well (402) connected in series; the secondary sedimentation tank sludge well (402) is further connected with the anaerobic tank (101), the anoxic tank (201) and the aerobic tank (301); the secondary sedimentation tank sludge well (402) is connected with the hydraulic deslagging tank (602) through a sludge lifting pump (601).

3. The system for modifying the activated sludge of a wastewater in-situ biological system according to claim 2, wherein: the heavy sludge buffer tank (605) is connected with the anaerobic tank (101), the anoxic tank (201) and the aerobic tank (301) through a heavy sludge lifting pump (606).

4. The system for modifying activated sludge according to claim 3, wherein: Further comprising a filler adding trolley (608) connected with the heavy sludge buffer tank (605).

5. The system for modifying activated sludge for use in a wastewater in-situ biological system of claim 1, wherein: the sludge conditioning and sorting device (604) comprises a hydraulic cyclone separator (6) and an outer shell (5) arranged outside the hydraulic cyclone separator (6); a sludge feeding main pipe (1), a lower sludge discharge main pipe (2), an upper sludge discharge main pipe (3) and a compressed air main pipe (4) arranged on the outer shell (5) as external connecting pipelines.

6. The system for modifying the activated sludge of an aerobic wastewater treatment system according to claim 5, characterized in that: a sludge inlet control valve (7) is installed on the sludge feeding main pipe (1).

7. The system for modifying the activated sludge of an aerobic wastewater treatment system according to claim 6, characterized in that: a lower sludge discharge control valve (8) is installed on the lower sludge discharge main pipe (2).

8. The system for modifying the activated sludge of an aerobic wastewater treatment system according to claim 7, characterized in that: an upper sludge discharge control valve (9) is installed on the upper sludge discharge main pipe (3).

9. The system for modifying the activated sludge of an aerobic wastewater treatment system according to claim 8, characterized in that: a backwashing air inlet control valve (10) is installed on the compressed air main pipe (4).

10. The system for modifying the activated sludge of an aerobic wastewater treatment system according to claim 9, characterized in that: a pressure gauge (11) is further installed on the outer shell (5).

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