Sequencing batch reactor (SBR) pool clear liquid sampling system containing activated sludge

Abstract

The utility model provides an activated sludge-containing clear liquid sampling system for an SBR (Sequencing Batch Reactor) pool, which adopts the technical scheme that a primary filter is arranged in the SBR pool, the primary filter is connected with a liquid inlet of a first peristaltic pump through a pipeline, a liquid outlet of the first peristaltic pump is connected with a centrifugal mechanism, and the centrifugal mechanism discharges clear liquid into a sample pool; clear liquid in the sample pool is pumped to a detection section through a suction filtration pump. The solid-liquid separation device has the beneficial effects that (1) solid-liquid separation is efficient, and the analysis error is reduced: the analysis error is reduced from 30% to less than 5%; the single treatment time is shortened to 5-8 minutes; (2) the whole process is automatic, and human intervention is reduced: when the turbidity of one centrifugal group exceeds the standard, the system is seamlessly switched to a standby group, so that continuous operation is guaranteed, and manual intervention for fault processing is not needed; only when the turbidity reaches the standard, the suction filtration pump is automatically started, so that unqualified clear liquid is prevented from entering a detection section; (3) the operation and maintenance cost is reduced: the long-term operation cost is reduced; and repeated detection caused by unstable quality of clear liquid is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of sampling device technology, and in particular relates to a clear liquid sampling system for SBR tanks containing activated sludge. Background Technology

[0002] In wastewater treatment processes in public workshops, the sequencing batch reactor (SBR) is the core treatment unit, which degrades organic matter and removes nitrogen and phosphorus through activated sludge. However, the mixed liquor discharged during SBR operation contains a high concentration of suspended activated sludge (MLSS), resulting in a high degree of mixing between the solid and liquid phases in the water sample. When analyzing key water quality indicators such as ammonia nitrogen and COD, the residual tiny sludge particles can interfere with the accuracy of optical detection (such as spectrophotometry) or chemical reactions. Water samples with insufficient sludge removal can lead to analytical errors of up to 30%, seriously affecting the reliability of process control.

[0003] Currently, existing technologies employ manual filter paper filtration and natural sedimentation. Manual filter paper filtration requires on-site water sample collection followed by repeated filtration through multiple layers of filter paper (e.g., 0.45μm pore size) to remove sludge. This method is time-consuming (20-30 minutes per filtration cycle), the filter paper is prone to clogging and requires frequent replacement, and the process is labor-intensive, making it difficult to meet continuous sampling requirements. Natural sedimentation requires allowing water samples to stand for several hours or more, relying on gravity settling to separate the solid and liquid phases. However, activated sludge, due to its colloidal properties, easily forms a stable suspension system, resulting in low sedimentation efficiency. Furthermore, prolonged standing may lead to ammonia nitrogen volatilization or further degradation of organic matter, affecting the timeliness and accuracy of the analysis. Summary of the Invention

[0004] To address the problems of low sedimentation efficiency and impact on the timeliness and accuracy of analysis in the existing technologies, this invention provides a system for sampling the clarified liquid containing activated sludge in an SBR tank. The technical solution includes an SBR tank containing a primary filter. The primary filter is connected to the inlet of a first peristaltic pump via a pipe. The outlet of the first peristaltic pump is connected to a centrifuge mechanism. The centrifuge mechanism discharges the clarified liquid into a sample tank. The clarified liquid in the sample tank is then pumped to the testing section by a filtration pump.

[0005] In a preferred embodiment, the centrifugation mechanism includes an electric three-way connector, two sets of centrifuge units connected in parallel, and a first turbidity monitor. The outlet of the first peristaltic pump is connected to one of the three-way connectors, and the remaining two of the three-way connectors are connected to the two sets of centrifuge units respectively. The effluent from the centrifuge units is connected to the first turbidity monitor respectively.

[0006] In a preferred embodiment, the centrifuge assembly includes a feed valve, a continuous flow centrifuge, and a second peristaltic pump. One end of an electric three-way connector is connected to the feed valve, which is connected to the inlet of the continuous flow centrifuge. The outlet of the continuous flow centrifuge is connected to the inlet of the second peristaltic pump, and the outlet of the second peristaltic pump is connected to a first turbidity monitor.

[0007] In a preferred embodiment, the electric tee is interlocked with the first turbidity monitor.

[0008] In a preferred embodiment, the continuous flow centrifuge is equipped with a liquid level sensor and a liquid level display screen. The liquid level sensor is interlocked with the second peristaltic pump, and the liquid level display screen is used to display the liquid level inside the continuous flow centrifuge.

[0009] In a preferred embodiment, the sample cell has a depth of at least 50 cm, the inlet pipe of the filtration pump is located in the middle of the sample cell, and a second turbidity monitor is also provided in the middle of the sample cell.

[0010] In a preferred embodiment, the second turbidity monitor is interlocked with the filtration pump.

[0011] In a preferred embodiment, the primary filter has a pore size of 0.5-1.0 mm.

[0012] The beneficial effects of this utility model are:

[0013] (1) High-efficiency solid-liquid separation, reducing analytical error: The two-stage treatment mode of primary filter pre-filtration and continuous flow centrifuge deep separation can quickly remove 0.5-1.0mm coarse sludge particles and micron-sized colloidal suspended matter from water samples, effectively eliminating the optical interference of sludge on ammonia nitrogen and COD detection, reducing the analytical error from 30% to less than 5%; the continuous flow centrifuge is interlocked with the second peristaltic pump, and the liquid level sensor monitors the liquid level in the centrifuge in real time, shortening the single processing time to 5-8 minutes, and the efficiency is more than 4 times higher than that of manual filtration;

[0014] (2) Full-process automation, reducing human intervention: The electric three-way head is interlocked with the first turbidity monitor to automatically switch the working status of the parallel centrifuge group. When a centrifuge group exceeds the turbidity standard, the system seamlessly switches to the standby group to ensure continuous operation without the need for manual intervention to handle the fault; The second turbidity monitor is interlocked with the vacuum filter pump to monitor the quality of the sample cell clear liquid in real time. The vacuum filter pump is automatically started only when the turbidity meets the standard to prevent unqualified clear liquid from entering the testing section;

[0015] (3) Reduced operation and maintenance costs: Compared with manual filter paper filtration, the system does not require frequent replacement of consumables, thus reducing long-term operating costs; automated control reduces the risk of human error and avoids repeated testing due to unstable quality of the clear liquid. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] In the diagram: 1. SBR tank; 2. Primary filter; 3. First peristaltic pump; 4. Electric tee; 5. Feed valve; 6. Continuous flow centrifuge; 7. Liquid level display screen; 8. Second peristaltic pump; 9. Liquid level sensor; 10. First turbidity monitor; 11. Sample cell; 12. Second turbidity monitor; 13. Vacuum filtration pump. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example

[0020] like Figure 1 The SBR tank containing activated sludge sampling system shown includes an SBR tank 1, a primary filter 2 placed in the SBR tank 1, the primary filter 2 being connected to the inlet of a first peristaltic pump 3 via a pipe, the outlet of the first peristaltic pump 3 being connected to a centrifuge mechanism, the centrifuge mechanism discharging the effluent into a sample tank 11, and the effluent in the sample tank 11 being pumped to the testing section by a filtration pump 13.

[0021] Furthermore, the centrifugation mechanism includes an electric three-way connector 4, two sets of centrifuge groups connected in parallel, and a first turbidity monitor 10. The outlet of the first peristaltic pump 3 is connected to one of the terminals of the electric three-way connector 4, and the remaining two terminals of the electric three-way connector 4 are respectively connected to the two sets of centrifuge groups. The effluent from the centrifuge groups is respectively connected to the first turbidity monitor 10.

[0022] Furthermore, the centrifuge assembly includes a feed valve 5, a continuous flow centrifuge 6, and a second peristaltic pump 8. One end of the electric three-way connector 4 is connected to the feed valve 5, the feed valve 5 is connected to the inlet of the continuous flow centrifuge 6, the outlet of the continuous flow centrifuge 6 is connected to the inlet of the second peristaltic pump 8, and the outlet of the second peristaltic pump 8 is connected to the first turbidity monitor 10.

[0023] Furthermore, the electric tee head 4 is interlocked with the first turbidity monitor 10.

[0024] Furthermore, the continuous flow centrifuge 6 is equipped with a liquid level sensor 9 and a liquid level display screen 7. The liquid level sensor 9 is interlocked with the second peristaltic pump 8, and the liquid level display screen 7 is used to display the liquid level inside the continuous flow centrifuge 6.

[0025] Furthermore, the sample cell 11 has a depth of at least 50 cm, the inlet pipe of the filtration pump 13 is located in the middle of the sample cell 11, and a second turbidity monitor 12 is also provided in the middle of the sample cell 11.

[0026] Furthermore, the second turbidity monitor 12 is interlocked with the filtration pump 13.

[0027] Furthermore, the primary filter 2 has a pore size of 0.5-1.0 mm.

[0028] The above system operates as follows: The first peristaltic pump 3 draws samples from the SBR tank 1 through the primary filter 2. The primary filter 2 removes most mechanical impurities. The samples then enter one of the centrifuge groups through the electric three-way valve 4 and are centrifuged in the continuous flow centrifuge 6. Once the liquid level in the continuous flow centrifuge 6 reaches the critical value, the corresponding injection valve 5 is closed and centrifugation begins. After centrifugation, the second peristaltic pump 8 is activated to discharge the samples into the sample tank 11. The samples in the sample tank 11 are then pumped away by the filtration pump 13 to the detection section. When the first turbidity monitor 10 detects… When the turbidity is higher than 30 NTU, the second peristaltic pump 8 stops running and the rotating bowl of the continuous flow centrifuge 6 is replaced. At this time, the electric three-way connector 4 switches the sample to another centrifuge group for centrifugation. After switching to another centrifuge group, the system monitors the liquid level and controls the start and stop of the second peristaltic pump 8 according to the same logic. When the liquid level sensor 9 detects that the liquid level of the continuous flow centrifuge 6 is lower than 1 / 5, the second peristaltic pump 8 stops and starts again after the liquid level rises to the specified value. When the second turbidity monitor 12 in the sample cell 11 detects that the turbidity is higher than 20 NTU, the filtration pump 13 stops running.

Claims

1. A system for sampling clarified liquid containing activated sludge from an SBR tank, comprising an SBR tank (1), characterized in that, The SBR tank (1) contains a primary filter (2), which is connected to the inlet of the first peristaltic pump (3) via a pipe. The outlet of the first peristaltic pump (3) is connected to the centrifugal mechanism. The centrifugal mechanism discharges the effluent into the sample tank (11), and the effluent in the sample tank (11) is pumped to the testing section by the filtration pump (13).

2. The SBR tank clear liquid sampling system containing activated sludge according to claim 1, characterized in that, The centrifugation mechanism includes an electric three-way connector (4), two sets of centrifuge groups connected in parallel, and a first turbidity monitor (10). The outlet of the first peristaltic pump (3) is connected to one of the electric three-way connectors (4), and the remaining two of the electric three-way connectors (4) are connected to the two sets of centrifuge groups respectively. The effluent from the centrifuge groups is connected to the first turbidity monitor (10) respectively.

3. The SBR tank clear liquid sampling system containing activated sludge according to claim 2, characterized in that, The centrifuge assembly includes a feed valve (5), a continuous flow centrifuge (6), and a second peristaltic pump (8). One end of an electric three-way connector (4) is connected to the feed valve (5). The feed valve (5) is connected to the inlet of the continuous flow centrifuge (6). The outlet of the continuous flow centrifuge (6) is connected to the inlet of the second peristaltic pump (8). The outlet of the second peristaltic pump (8) is connected to the first turbidity monitor (10).

4. The SBR tank clear liquid sampling system containing activated sludge according to claim 2, characterized in that, The electric three-way connector (4) is interlocked with the first turbidity monitor (10).

5. The SBR tank clear liquid sampling system containing activated sludge according to claim 3, characterized in that, The continuous flow centrifuge (6) is equipped with a liquid level sensor (9) and a liquid level display screen (7). The liquid level sensor (9) is interlocked with the second peristaltic pump (8), and the liquid level display screen (7) is used to display the liquid level in the continuous flow centrifuge (6).

6. The SBR tank clear liquid sampling system containing activated sludge according to claim 1, characterized in that, The sample cell (11) is at least 50 cm deep, the inlet pipe of the filtration pump (13) is located in the middle of the sample cell (11), and a second turbidity monitor (12) is also provided in the middle of the sample cell (11).

7. The SBR tank clear liquid sampling system containing activated sludge according to claim 6, characterized in that, The second turbidity monitor (12) is interlocked with the vacuum pump (13).

8. The SBR tank clear liquid sampling system containing activated sludge according to claim 1, characterized in that, The primary filter (2) has a pore size of 0.5-1.0 mm.

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