Sequencing batch water sample monitoring device

Abstract

The utility model provides a sequencing batch water sample monitoring device which comprises a sampling mechanism, a gravity separation tank and a sample tank, the sampling mechanism is respectively connected with a sewage treatment unit and the gravity separation tank through pipelines, and the gravity separation tank is connected with the sample tank through a pipeline; a water inlet and an emptying port are formed in the lower part of the gravity separation tank, the water inlet is connected with the sampling mechanism through a pipeline, and the emptying port and the water inlet are respectively positioned at two ends of the gravity separation tank; a water outlet is formed in the top of the gravity separation tank and is connected with the sample tank; and the upper part of the gravity separation tank is provided with a separation overflow port. According to the sequencing batch type water sample monitoring device disclosed by the utility model, medium filtering separation is replaced by quick gravity separation, continuous dynamic filtering separation treatment is replaced by sequencing batch type static separation, and on the premise of ensuring the separation effect, the operation and maintenance are simpler, and the operation cost is lower.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment plant testing and analysis, and in particular relates to a sequential batch water sample monitoring device. Background Technology

[0002] With increasingly stringent environmental regulations, online monitoring instruments have been widely used to monitor the influent / effluent and process water quality of wastewater treatment plants. This ensures that operators can understand water quality changes in a timely manner, thereby adjusting the operating parameters of wastewater treatment facilities and instruments to ensure that emissions meet standards.

[0003] Among various online monitoring points, the wastewater from the influent and process units has complex water quality, containing a large amount of suspended solids (SS) or MLSS from the biological tank. This poses a significant challenge to the stability and reliability of its online monitoring data, affecting the control judgment of process technicians or the effective operation of the water plant's operating system.

[0004] This problem can be solved by removing suspended solids (SS) through filtration technology, but filtration technology has disadvantages such as high energy consumption (sampling power, purge air, separation pressure difference) and large maintenance workload (frequent clogging, cleaning, and replacement of filter media). At the same time, filtration, especially membrane filtration, itself can have a significant impact on water quality test results.

[0005] As wastewater treatment plants continue to advance towards refined and intelligent operation and management, the sampling and pretreatment issues for influent and process online monitoring urgently need to be optimized and resolved to ensure the stable and compliant operation of wastewater treatment plants and the realization of refined and intelligent operation. Summary of the Invention

[0006] In view of this, the present invention aims to overcome the defects in the prior art and propose a sequential batch water sample monitoring device.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A sequential batch water sample monitoring device includes a sampling mechanism, a gravity separation tank, and a sample tank. The sampling mechanism is connected to a wastewater treatment unit and the gravity separation tank via pipelines, and the gravity separation tank is connected to the sample tank via pipelines.

[0009] The gravity separation tank is provided with an inlet and an outlet at its lower part. The inlet is connected to the sampling mechanism through a pipeline, and the outlet and inlet are located at opposite ends of the gravity separation tank.

[0010] The gravity separation cell is provided with a drain outlet at the top, and the drain outlet is connected to the sample cell;

[0011] The gravity separation tank is provided with a separation overflow port at the top.

[0012] Furthermore, a first water pump is installed between the sampling mechanism and the gravity separation cell. One end of the first water pump is connected to the sampling mechanism via a pipeline, and the other end is connected to the gravity separation cell via a pipeline. A second water pump is installed between the gravity separation cell and the sample cell. One end of the second water pump is connected to the gravity separation cell via a pipeline, and the other end is connected to the sample cell via a pipeline. The second water pump extracts the supernatant from the gravity separation cell, and the pipeline extends into the supernatant area through a drain outlet, delivering the supernatant from the gravity separation cell to the sample cell at regular intervals and in measured quantities. The water pipe extends below the water surface of the gravity separation cell, preferably to a depth of 5-25% of the effective water depth of the gravity separation cell. The depth is adjusted according to the sedimentation characteristics of the suspended solids (SS) in the influent to ensure that the water sample obtained by the system is not interfered with by SS during detection.

[0013] Furthermore, the sample cell has an inlet at the bottom, which is connected to the gravity separation cell via the second water pump, and an overflow outlet at the top. An immersion-type online detection instrument is installed at the top of the sample cell for real-time monitoring. An automatic sampling detection instrument has a sampling port in the upper middle part of the sample cell, preferably at a water depth of 50-80%. The online detection instrument using chemical analysis methods can extract test samples from the sampling port for online sampling and detection.

[0014] Furthermore, the sampling mechanism includes a support frame, a connecting sleeve, an outlet pipe, and a sampling component. The support frame is located on the wastewater treatment unit, the connecting sleeve is located on the support frame, one end of the outlet pipe passes through the connecting sleeve and is connected to the sampling component, and the other end is connected to the first water pump.

[0015] Furthermore, a primary filter sleeve is provided on the outer bottom of the sampling component, and the filter sleeve has several outer filter holes. A removable cover is provided on the top of the sampling component, and one end of the outlet pipe passes through the cover and is placed inside the sampling component. Several inner water inlet holes are provided on the bottom of the sampling component. The lowest point of the sampling component is located 30 cm below the liquid level of the wastewater treatment unit.

[0016] Furthermore, a secondary filter is provided on the inner side of the sampling element, the water outlet pipe is located above the secondary filter, and the inner water inlet is located below the secondary filter.

[0017] Furthermore, the diameter of the inner water inlet hole is less than or equal to the diameter of the outer filter hole.

[0018] Furthermore, a valve is installed on the effluent pipe, and a valve is installed at the drain outlet of the gravity separation tank. The valve at the drain outlet is used to periodically drain the remaining sewage and sludge in the gravity separation tank. The drain outlet is connected to the pretreatment or biological treatment process unit of the on-site sewage treatment system through a pipeline, so that the discharged remaining sewage and sludge can be returned to the sewage treatment system.

[0019] Furthermore, the gravity separation cell is circular or square, with a depth of 30-50 cm and a diameter or side length of 20-30 cm; the sample cell is also circular or square, with a depth of 10-15 cm and a diameter of 5-10 cm. The sample cell is used to collect the water sample to be tested. The water sample enters from the bottom and overflows from the sample overflow outlet at the top.

[0020] When using siphon sampling, the first water pump can be eliminated.

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] The sequential batch water sample monitoring device of this invention uses gravity separation instead of media filtration separation, and adopts sequential batch static separation instead of continuous dynamic filtration separation. Under the premise of ensuring separation effect, it is simpler to operate and maintain, and has lower operating costs. Moreover, the water sample prepared by gravity separation is basically consistent with the water sample collected by daily manual testing, avoiding the influence of fine filtration separation on water quality test results, making the test data more comparable, and saving the energy consumption required for fine filtration.

[0023] The sequential batch water sample monitoring device of this invention combines efficient initial sedimentation of the mixed solution with a small amount of water required for water quality testing, enabling rapid preparation of water samples. The operating cycle is short, generally 10-30 minutes, which can meet the real-time requirements of online monitoring for samples. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a schematic diagram of the sequential batch water sample monitoring device described in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the sampling mechanism described in an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the sampling component described in an embodiment of the present utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Sampling mechanism; 2. Gravity separation tank; 3. Sample tank; 4. First water pump; 5. Second water pump; 6. Wastewater treatment unit; 11. Support frame; 12. Connecting sleeve; 13. Outlet pipe; 14. Sampling component; 141. Cover; 142. Primary filter sleeve; 143. Secondary filter component; 144. Inner water inlet; 145. Outer filter hole; 21. Water inlet; 22. Drain outlet; 23. Separation overflow outlet; 24. Drain outlet; 31. Sample overflow outlet; 32. Immersion online detector; 33. Liquid inlet; 34. Sampling hole. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] like Figure 1-2As shown, a sequential batch water sample monitoring device includes a sampling mechanism, a gravity separation tank, and a sample tank. The sampling mechanism is connected to a wastewater treatment unit and a gravity separation tank via pipelines, and the gravity separation tank is connected to the sample tank via pipelines.

[0035] The gravity separation tank has an inlet and an outlet at its lower part. The inlet is connected to the sampling mechanism via a pipeline. The outlet and inlet are located at opposite ends of the gravity separation tank. The gravity separation tank has a drain outlet at its top, which is connected to the sample tank. The gravity separation tank also has a separation overflow outlet at its upper part.

[0036] A first water pump is installed between the sampling mechanism and the gravity separation cell. One end of the first water pump is connected to the sampling mechanism via a pipeline, and the other end is connected to the gravity separation cell via a pipeline. A second water pump is installed between the gravity separation cell and the sample cell. One end of the second water pump is connected to the gravity separation cell via a pipeline, and the other end is connected to the sample cell via a pipeline. The second water pump draws the supernatant from the gravity separation cell, and the pipeline extends into the supernatant area through a drain outlet, delivering the supernatant from the gravity separation cell to the sample cell at regular intervals and in measured quantities. The water pipe extends below the water surface of the gravity separation cell, preferably to a depth of 5-25% of the effective water depth of the gravity separation cell. The insertion depth is adjusted according to the sedimentation characteristics of the suspended solids (SS) in the influent to ensure that the water sample obtained by the system is not interfered with by SS during detection.

[0037] The sample cell has an inlet at the bottom, which is connected to the gravity separation cell via a second water pump. An overflow outlet is located at the top of the sample cell. Immersion-type online monitoring instruments (such as DO, ORP, and pH meters) are installed at the top of the sample cell for real-time monitoring. Simultaneously, an automatic sampling and monitoring instrument has a sampling port at a water depth of 50-80% of the sample cell. Online monitoring instruments using chemical analysis methods (such as COD, TN, and TP meters) can extract test samples through the sampling port for online monitoring.

[0038] A valve is installed on the effluent pipe, and a valve is installed at the drain outlet of the gravity separation tank. The valve at the drain outlet is used to periodically drain the excess sewage and sludge in the gravity separation tank. The drain outlet is connected to the pretreatment or biological treatment process unit of the on-site sewage treatment system through a pipeline, so that the drained excess sewage and sludge can be returned to the sewage treatment system.

[0039] The gravity separation cell is circular or square, with a depth of 30-50 cm and a diameter of 20-30 cm. The sample cell is also circular or square, with a depth of 10-15 cm and a diameter of 5-10 cm. The sample cell is used to collect the water sample to be tested. The water sample enters from the bottom and overflows from the sample overflow port at the top.

[0040] The sampling mechanism includes a support frame, a connecting sleeve, a water outlet pipe, and a sampling component. The support frame is located on the wastewater treatment unit, the connecting sleeve is located on the support frame, one end of the water outlet pipe passes through the connecting sleeve and is connected to the sampling component, and the other end is connected to the first water pump.

[0041] The sampling element has a primary filter sleeve on its bottom outer side, with several external filter holes on the filter sleeve. A removable cover is provided on the top of the sampling element, and one end of the water outlet pipe passes through the cover and is placed inside the sampling element. Several internal water inlet holes are provided on the bottom of the sampling element. The lowest point of the sampling element is located 30 cm below the liquid surface at the sampling point.

[0042] The sampling element has a secondary filter on its inner side, the water outlet pipe is located above the secondary filter, and the inner water inlet is located below the secondary filter. The diameter of the inner water inlet is less than or equal to the diameter of the outer filter hole.

[0043] The sequential batch water sample monitoring device is operated according to the following steps and methods:

[0044] 1. Water sampling: The water sampling time of the sampling device should preferably be controlled within 1-3 minutes.

[0045] 2. Separation: The influent is allowed to settle in a gravity separation tank. The settling time is preferably 5-25 minutes.

[0046] 3. Drainage: After gravity separation is completed, start the second water pump to send the supernatant into the sample cell. The water sample sent into the sample cell at one time should be more than 3 times the effective volume of the sample cell. After the supernatant is transported, the water pipe at the front end of the second water pump should be kept 0.5 cm below the liquid level to prevent surface scum from being extracted.

[0047] 4. Drainage: After drainage is completed, the valve on the drain port will automatically open to completely discharge the remaining sewage and sludge in the gravity separation tank.

[0048] 5. Standby: After emptying, the sequential batch water sample monitoring device is in standby mode or begins the next cycle. The preferred cycle for the entire process of this device is 10-30 minutes.

[0049] Furthermore, the standby time of this device is determined according to the measurement cycle of the detection method. Generally, detection instruments using chemical analysis methods perform detection once every 1-2 hours, which is significantly longer than the operating cycle of this device. In this case, its standby time is determined by the detection cycle. When using immersion online detection instruments (such as DO, ORP, and pH detectors), the standby time of this device is determined according to the water quality fluctuations. If the fluctuations are large, the standby time can be 0. If the fluctuations are small, the standby time is determined according to the sensing needs, with a maximum of 30 minutes.

[0050] Example 1

[0051] A municipal wastewater treatment plant installed an electrode-type ammonia nitrogen detector at the end of its wastewater treatment unit. Because MLSS in the wastewater treatment unit has a large interference with the detection results, the aforementioned sequential batch water sample monitoring device is used for online monitoring.

[0052] The wastewater treatment unit is located on the ground, with the water level approximately 3 meters higher than the surrounding ground. Therefore, a siphon sampling mechanism is used to draw the mixed liquid from the effluent of the wastewater treatment unit into a gravity separation tank through a pipe with an inner diameter of 2.5 cm. The gravity separation tank is a cube, 25 cm long and wide, and 30 cm high, with an effective volume of approximately 18 L. The bottom is approximately 0.5 meters above the ground. After siphoning in water for 30 seconds, the inlet control valve is closed, followed by 15 minutes of static settling.

[0053] After gravity separation is complete, the second water pump is activated to transfer the supernatant from the gravity separation cell to the sample cell. The water inlet pipe of the second water pump is positioned 5 cm below the overflow pipe of the gravity separation cell (2 cm from the top). Supernatant discharge is stopped when the liquid level drops to 4 cm below the overflow pipe. This means the discharged supernatant volume is 25 × 25 × 4 = 2500 mL, and the sample cell volume is 500 mL (circular, 8 cm inner diameter, approximately 10 cm high). The single supernatant discharge volume is approximately 5 times the sample cell volume, effectively replacing the original sample in the sample cell (the actual water sample volume is even smaller when a probe is inserted). The supernatant discharge time is approximately 30 seconds.

[0054] A submersible ammonia nitrogen detector is installed at the top of the sample tank, with its probe extending 6 cm below the liquid surface to monitor the ammonia nitrogen in the effluent from the aeration tank. A sampling port is set at 60% water depth in the sample tank, through which an online COD detector using chemical analysis methods automatically samples and tests, with a testing cycle of once every 2 hours. After the supernatant is discharged, the detector begins sampling and testing or real-time monitoring.

[0055] Simultaneously, after the supernatant is discharged, the valve on the drain outlet is immediately activated to completely empty the remaining sewage and sludge from the gravity separation tank within 60 seconds. Then it enters standby mode. Based on the ammonia nitrogen and COD monitoring requirements of the aeration tank, its operating cycle is set to 30 minutes: 30 seconds of influent, 15 minutes of gravity separation, 30 seconds of drainage, 60 seconds of emptying, and 13 minutes of standby. The submersible ammonia nitrogen detector performs one test per cycle, i.e., every 30 minutes; the COD detector using chemical analysis methods performs a sampling test every 4 cycles, i.e., every 2 hours.

[0056] After adopting the aforementioned sequential batch water sample monitoring device, the measurement data of the submerged ammonia nitrogen detector is more stable, effectively avoiding the influence of MLSS from the wastewater treatment unit on data fluctuations; the COD data detected by chemical analysis methods is also more consistent with daily manual testing data. Furthermore, this device has a simple structure and low operation and maintenance costs.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sequential batch water sample monitoring device, characterized in that: It includes a sampling mechanism, a gravity separation tank, and a sample tank. The sampling mechanism is connected to the wastewater treatment unit and the gravity separation tank via pipelines, and the gravity separation tank is connected to the sample tank via pipelines. The gravity separation tank is provided with an inlet and an outlet at its lower part. The inlet is connected to the sampling mechanism through a pipeline, and the outlet and inlet are located at opposite ends of the gravity separation tank. The gravity separation cell is provided with a drain outlet at the top, and the drain outlet is connected to the sample cell; The gravity separation tank is provided with a separation overflow port at the top.

2. The sequential batch water sample monitoring device according to claim 1, characterized in that: A first water pump is installed between the sampling mechanism and the gravity separation cell. One end of the first water pump is connected to the sampling mechanism through a pipeline, and the other end is connected to the gravity separation cell through a pipeline. A second water pump is installed between the gravity separation cell and the sample cell. One end of the second water pump is connected to the gravity separation cell through a pipeline, and the other end is connected to the sample cell through a pipeline.

3. The sequential batch water sample monitoring device according to claim 2, characterized in that: The sample cell is provided with an inlet at the bottom, which is connected to the gravity separation cell via the second water pump, and an overflow outlet at the top of the sample cell.

4. The sequential batch water sample monitoring device according to claim 2, characterized in that: The sampling mechanism includes a support frame, a connecting sleeve, a water outlet pipe, and a sampling component. The support frame is located on the wastewater treatment unit, the connecting sleeve is located on the support frame, one end of the water outlet pipe passes through the connecting sleeve and is connected to the sampling component, and the other end is connected to the first water pump.

5. The batch water sample monitoring device according to claim 4, characterized in that: The sampling component has a primary filter sleeve on its bottom outer side, and the filter sleeve has several outer filter holes. The sampling component has a detachable cover on its top, and one end of the water outlet pipe passes through the cover and is placed inside the sampling component. The sampling component has several inner water inlet holes on its bottom.

6. The sequential batch water sample monitoring device according to claim 5, characterized in that: The sampling device has a secondary filter on its inner side, the water outlet pipe is located above the secondary filter, and the inner water inlet is located below the secondary filter.

7. The batch water sample monitoring device according to claim 5, characterized in that: The diameter of the inner water inlet hole is less than or equal to the diameter of the outer filter hole.

8. The batch water sample monitoring device according to claim 4, characterized in that: A valve is installed on the water outlet pipe, and a valve is installed at the drain outlet of the gravity separation tank.

9. The batch water sample monitoring device according to claim 4, characterized in that: The gravity separation cell has a depth of 30-50 cm and a diameter or side length of 20-30 cm; the sample cell has a depth of 10-15 cm and a diameter of 5-10 cm.

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