A sludge conditioning and separation device for biological treatment of sewage

Abstract

This utility model discloses a sludge conditioning and sorting device for wastewater biochemical treatment, including a hydrocyclone separator and an outer casing disposed outside the hydrocyclone separator. A sludge feed header, a lower sludge discharge header, an upper sludge discharge header, and a compressed air header are disposed on the outer casing as external connection lines. This utility model can condition the settled sludge in the secondary sedimentation tank of an in-situ biochemical system, separating the low-density, light, aged sludge, while retaining the carrier packing material detached from the disintegration of granular sludge and the high-density, heavy granular sludge. Simultaneously, the addition of an air backwash control system effectively solves the clogging problem of the hydrocyclone separator and significantly improves the operational stability of the hydrocyclone separator.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a sludge conditioning and sorting device for wastewater biochemical treatment. Background Technology

[0002] Aerobic granular sludge technology originated at Delft University of Technology in the Netherlands in the 1990s. Domestic research began in 1995. After nearly 30 years of research, the formation mechanism and advantages of aerobic granular sludge have been demonstrated. However, industrialization has been slow, and various process routes exist. Some methods involve adding a three-phase separator to the aerobic tank, while others use hydrocyclones. Using a three-phase separator requires large-scale modification of the in-situ biological treatment system, resulting in a long construction period and high costs. Hydrocyclones treat excess sludge with less modification to the in-situ biological treatment system, a shorter construction period, and lower investment. However, in practical applications at urban wastewater treatment plants, hydrocyclones frequently become clogged by large suspended solids, affecting sludge conditioning and sorting efficiency and leading to unstable excess sludge discharge. To address the frequent clogging issue in hydrocyclones, an outer shell is added to the hydrocyclone. This shell includes a backwash air inlet and a pressure gauge on the top. Electric control valves are also installed at the sludge inlet, upper sludge outlet, lower sludge outlet, and backwash air inlet for interlocked control. This allows for sequential, time-controlled backwashing of the sludge inlet, upper sludge outlet, and lower sludge outlet, effectively resolving the clogging problem and significantly improving the operational stability of the hydrocyclone. Utility Model Content

[0003] The purpose of this invention is to provide a sludge conditioning and sorting device for wastewater biochemical treatment, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sludge conditioning and sorting device for wastewater biochemical treatment, comprising...

[0005] 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.

[0006] 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.

[0007] Preferably, a sludge inlet control valve is installed on the sludge inlet header.

[0008] In any of the above embodiments, it is preferred that a sludge discharge control valve is installed on the sludge discharge header.

[0009] In any of the above embodiments, it is preferred that an upper sludge discharge control valve is installed on the upper sludge discharge header.

[0010] In any of the above embodiments, it is preferred that a backwash intake control valve is installed on the compressed air header.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] The technical effects and advantages of this utility model are as follows: 1. The device of this utility model has low investment and flexible application. It can be used independently or in combination with other equipment according to different applicable scenarios. Multiple units can be connected in parallel.

[0015] 2. The device of this utility model is applied to sludge treatment in biological systems. It has the functions of conditioning and sorting sludge in the secondary sedimentation tank of the in-situ biological system, intercepting the carrier packing material and heavy granular sludge that have fallen off from the disintegration of granular sludge, and sending them back to the in-situ biological system by gravity or through other supporting equipment. It sorts out the light aged sludge with low density and discharges it as excess sludge from the in-situ biological system.

[0016] 3. The automatic air backwashing function of the device with time-sequence interlock control of this utility model can effectively solve the problem of fouling in hydrocyclone separators;

[0017] 4. Reduce maintenance workload, effectively improve operational stability, and lower maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0019] In the diagram: 1. Sludge feed header; 2. Lower sludge discharge header; 3. Upper sludge discharge header; 4. Compressed air header; 5. External housing; 6. Hydrocyclone separator; 7. Sludge feed control valve; 8. Lower sludge discharge control valve; 9. Upper sludge discharge control valve; 10. Backwash air intake control valve; 11. Pressure gauge. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] This utility model provides, for example Figure 1 The sludge conditioning and sorting device for wastewater biochemical treatment shown 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.

[0024] 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.

[0025] The sludge feed main pipe 1, lower sludge discharge main pipe 2, upper sludge discharge main pipe 3 and compressed air main pipe 4 are the 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 main pipe 1, lower sludge discharge main pipe 2, upper sludge discharge main pipe 3 and compressed air main pipe 4.

[0026] 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.

[0027] The sludge from the secondary sedimentation tank is fed into the sludge inlet manifold 1, flows through the sludge inlet 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 are discharged into the lower sludge manifold 2. The light, aged sludge flows through the upper sludge discharge control valve 9 and enters the upper sludge manifold 3, where it is discharged as excess sludge. The internal hydrocyclone separator 6 separates activated sludge particles of different sizes (small granular sludge particles less than 150 μm, large particles ≥ 150 μm).

[0028] 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.

[0029] 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. A sludge conditioning and sorting device for wastewater biochemical treatment, characterized in that: include Hydrocyclone separator (6) and outer casing (5) disposed outside the hydrocyclone separator (6); The sludge feed header (1), the lower sludge discharge header (2), the upper sludge discharge header (3), and the compressed air header (4) are installed on the outer casing (5) as external connecting lines; The sludge feed header (1) is equipped with a sludge feed control valve (7), the lower sludge discharge header (2) is equipped with a lower sludge discharge control valve (8), the upper sludge discharge header (3) is equipped with an upper sludge discharge control valve (9), the compressed air header (4) is equipped with a backwash air intake control valve (10), and a pressure gauge (11) is also included, which is installed on the outer casing (5).

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