Online detection system and detection method for toxicity of inflow water of sewage plant

Abstract

The invention provides an online detection system and method for toxicity of inflow water of a sewage plant. The sewage plant inflow toxicity online detection system comprises a case, a sludge circulation tank, a sewage circulation tank, a rotating assembly and a connecting assembly, the rotating assembly comprises a rotating disc which can be driven by a first power unit to rotate. A plurality of detection bottles are arranged on the rotating disc, each detection bottle is provided with a sludge inlet and a sewage inlet, and a dissolved oxygen measuring instrument, a stirring unit and an aeration disc are arranged in each detection bottle; the connecting assembly comprises a second power unit, a mounting block and two connecting pipes, one ends of the two connecting pipes are connected with the sludge circulating tank and the sewage circulating tank, the free ends of the two connecting pipes are arranged on the mounting block, and the mounting block can be driven by the second power unit to move; the free ends of the two connecting pipes are driven to be connected with or separated from the sludge inlet and the sewage inlet of one of the detection bottles. The on-line detection system for the toxicity of the inlet water of the sewage plant, provided by the invention, can have relatively high detection frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage toxicity detection equipment, and specifically, to an on-line detection system and method for the toxicity of influent water in a sewage treatment plant. Background Art

[0002] At present, the activated sludge process is usually used to treat sewage in the field of sewage treatment. It utilizes the metabolic functions of microorganisms in the activated sludge to transform and degrade pollutants in wastewater. When toxic wastewater enters a sewage treatment plant adopting the activated sludge process, it will have an inhibitory and toxic effect on the microorganisms in the activated sludge, inhibit the biological activity of the activated sludge, reduce the treatment efficiency of microorganisms, disrupt the normal operation of the sewage treatment plant, and ultimately result in the unqualified effluent quality of the sewage treatment plant. Toxic wastewater may even completely inactivate the microorganisms in the sewage treatment plant.

[0003] The existing methods for detecting the toxicity of influent water in a sewage treatment plant mainly include physicochemical analysis methods and biological analysis methods. Physicochemical analysis methods mainly conduct quantitative analysis on the main components in toxic pollutants, and can accurately understand the content of a certain toxic substance component. However, due to the diversity of toxic substances in water, it is difficult to conduct quantitative analysis on all toxic substance components, and it is even more impossible to consider the inhibitory and synergistic effects between various toxic substance components. Therefore, only the content of the main toxic substance components in toxic pollutants can be quantitatively analyzed, and the comprehensive impact of various toxic substance components in pollutants on the environment cannot be reflected. As a toxicity detection method, biological analysis methods utilize the reactions generated by organisms sensitive to environmental pollution or toxicity to evaluate environmental quality. The biological toxicity detection method can quickly reflect the comprehensive impact of various toxic substances on the environment, and is a rapid detection method for comprehensive indicators of environmental toxicity.

[0004] Biological toxicity detection methods can be classified according to the different biological species used. They mainly include fish toxicity detection methods, flea toxicity detection methods, algae toxicity detection methods, luminescent bacteria toxicity detection methods, and activated sludge respiration rate detection methods, etc. Since the test organisms used in the activated sludge respiration rate detection method are the same organisms used for sewage treatment, the measured results have more practical guiding significance for the control of the sewage treatment process, and it is an ideal method for evaluating the toxicity of influent water quality in a sewage treatment plant.

[0005] In view of the above problems, the utility model patent with the application number 202422749431X previously applied by the applicant provides an on-line detection system for the toxicity of influent water in a sewage treatment plant, which can detect the toxicity of influent water in a sewage treatment plant more objectively and accurately. However, it still has the following defects: it takes at least 30 - 50 minutes to complete one detection, and the detection frequency can only be reduced but not increased. Summary of the Invention

[0006] For this reason, the present invention provides an on-line detection system and method for the toxicity of influent water in a sewage treatment plant to at least partially solve the technical problems that the detection frequency of the existing detection system for the toxicity of influent water in a sewage treatment plant may be relatively low and cannot be increased.

[0007] The technical solution of the present invention is as follows: An on-line detection system for the toxicity of influent water in a sewage treatment plant, comprising: A chassis; A sludge circulation tank, which is arranged inside the chassis, and the sludge circulation tank has a sludge input port communicated with a biochemical tank, and a sludge output port is also arranged on the sludge circulation tank; A sewage circulation tank, which is arranged inside the chassis, and the sewage circulation tank has a sewage input port communicated with the sewage inlet pipe of the sewage treatment plant, and a sewage output port is also arranged on the sewage circulation tank; A rotating assembly, including a first power unit and a turntable arranged inside the chassis, the turntable can be driven by the first power unit to rotate; and a plurality of detection bottles are arranged on the turntable, each detection bottle is respectively provided with a sludge inlet and a sewage inlet, and a dissolved oxygen measuring instrument, a stirring unit and an aeration disc are arranged inside the detection bottle; A connecting assembly, including a second power unit, a mounting block and two connecting pipes, one ends of the two connecting pipes are correspondingly connected to the sludge output port and the sewage output port, the free ends of the two connecting pipes are respectively arranged on the mounting block, and the mounting block can be driven by the second power unit to move, so as to drive the free ends of the two connecting pipes to be connected to or separated from the sludge inlet and the sewage inlet of one of the detection bottles.

[0008] Furthermore, it further includes a circulation pipeline and a first pump body. The two ends of the circulation pipeline respectively extend into different positions of the biochemical tank. The first pump body is used to form sludge entering one end of the circulation pipeline from the biochemical tank and flowing back into the biochemical tank through the other end of the circulation pipeline. The sludge circulation tank is communicated with the middle of the circulation pipeline.

[0009] Furthermore, a mounting plate is fixedly arranged inside the chassis. The first power unit is a motor fixedly arranged below the mounting plate. The motor shaft of the motor axially penetrates through the mounting plate, and the turntable is fixedly sleeved on the motor shaft; and a plurality of blind holes are formed on the mounting plate, and each detection bottle can be fixedly inserted into each blind hole in a one-to-one correspondence.

[0010] Furthermore, a mounting disc is fixedly arranged inside the chassis and located below the mounting plate. A plurality of gas supply pipelines are arranged on the mounting disc. One ends of the gas supply pipelines on the mounting disc are connected to an external gas supply device, and the other ends pass through the mounting plate and are connected to the aeration discs inside the corresponding detection bottles.

[0011] Further, the stirring unit includes a magnetic drive disposed on the bottom surface of the blind hole and a magnetic stirrer placed in the test bottle.

[0012] Further, it further includes a fresh water tank and a chemical agent tank disposed in the chassis. The test bottle is further provided with a first interface; the mounting block is further provided with a first pipeline. Branch pipes are respectively provided between the fresh water tank and the chemical agent tank and the first pipeline. A second pump body is provided on the first pipeline. The first pipeline can be connected to or disconnected from the first interface as the mounting block moves.

[0013] Further, the test bottle is further provided with a first interface. The mounting block is further provided with a second pipeline connected to the fresh water tank. A third pump body is provided on the second pipeline. The second pipeline can be connected to or disconnected from the first interface as the mounting block moves.

[0014] Further, the test bottle includes a bottle body and a bottle cap assembly. The bottle cap assembly includes a cap body and a closing mechanism. The cap body is provided with through holes into which the free ends of the respective connecting pipes on the mounting block can be inserted. The closing mechanism includes two cover plates slidably disposed on the cap body, and a pushing portion is provided on the two cover plates. A pushing portion is provided on the mounting block. When the mounting block moves towards the cap body, the pushing portion can push the pushing portion, so that the respective through holes are exposed.

[0015] Further, the pushing portion is an inclined surface respectively disposed on the two cover plates, and the pushing portion is a second inclined surface correspondingly disposed on the mounting block and capable of fitting with the two inclined surfaces.

[0016] In a second aspect, the present invention provides an on-line detection method for the toxicity of the influent of a sewage treatment plant. Further, the above-mentioned on-line detection system for the toxicity of the influent of a sewage treatment plant is applied, and it includes the following steps: S1. Turn on the first pump body to form a cycle of sludge from the self-aeration tank to the circulation pipeline and then to the aeration tank by the first pump body; S2. Transport sludge from the circulation pipeline to the sludge circulation tank, and transport sewage from the sewage inlet pipe to the sewage circulation tank; S3. Respectively transport a fixed amount of sludge and sewage from the sludge circulation tank and the sewage circulation tank into the test bottle, and after adding a fixed amount of nutrient agent to the test bottle, perform the following processes: S31. Aerate the test bottle until the dissolved oxygen is maximized, and then place it for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real time throughout the process, and calculate the sludge respiration rate curve 1 through the system; S32. After the process S31 ends, pump a fixed amount of sewage into the detection bottle, aerate it until the dissolved oxygen reaches the maximum, and then let it stand for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real time, and calculate the respiration rate curve 2 of the sludge through the system. S33. Judge the toxicity of the sewage by comparing the respiration rate curve 1 and the respiration rate curve 2.

[0017] The working principle and beneficial effects of the present invention are as follows: The on-line detection system for the toxicity of the influent of the sewage treatment plant provided by the present invention sets a turntable in the chassis and a plurality of detection bottles on the turntable, so that the plurality of detection bottles can be sequentially rotated to the positions where sludge and sewage can be filled and detected, thereby improving the detection frequency. Brief Description of the Drawings

[0018] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] Figure 1 It is a schematic connection structure diagram of the on-line detection system for the toxicity of the influent of the sewage treatment plant provided by the embodiment of the present invention; Figure 2 It is a schematic internal structure diagram of the chassis provided by the embodiment of the present invention; Figure 3 For Figure 2 The partial enlarged view at A in Figure 4 It is a schematic structural diagram of the sludge circulation tank provided by the embodiment of the present invention; Figure 5 It is a schematic structural diagram of the sewage circulation tank provided by the embodiment of the present invention; Figure 6 It is an exploded view of the detection bottle provided by the embodiment of the present invention.

[0020] In the figure: 100, sludge circulation tank; 110, biochemical pool; 120, circulation pipeline; 130, first pump body; 140, connecting pipeline; 101, sludge input port; 102, overflow port; 103, sewage discharge port; 104, sludge outlet; 105, diaphragm metering pump; 200, sewage circulation tank; 201, cylindrical section; 202, conical section; 210, sewage inlet pipe; 300, chassis; 310, rotating assembly; 311, turntable; 320, connecting assembly; 321, mounting block; 322, connecting pipe; 323, first pipeline; 324, second pipeline; 325, push block; 330, mounting plate; 331, air supply pipeline; 400, detection bottle; 410, bottle body; 420, cover body; 430, cover plate; 431, inclined surface; 440, spring; 401, through hole; 500, clear water tank; 600, chemical agent tank. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] This embodiment provides an on-line detection system for the toxicity of the influent of a sewage treatment plant, which will be briefly referred to as the detection system hereinafter. Refer to Figure 1 As shown, it includes a sludge circulation tank 100 and a sewage circulation tank 200. Among them, the sludge circulation tank 100 has a sludge input port 101 communicating with the biochemical tank 110, and a sludge output port is also provided on the sludge circulation tank 100. The sewage circulation tank 200 has a sewage input port communicating with the sewage inlet pipe 210 of the sewage treatment plant, and a sewage output port is also provided on the sewage circulation tank 200.

[0023] The detection system of this embodiment further includes a chassis 300, a rotating assembly 310 and a connecting assembly 320. Refer to Figure 2 As shown, the rotating assembly 310 of this embodiment includes a first power unit and a turntable 311 provided in the chassis 300. The turntable 311 can be driven by the first power unit to rotate; and a plurality of detection bottles 400 are provided on the turntable 311. Each detection bottle 400 is respectively provided with a sludge inlet and a sewage inlet, and a dissolved oxygen measuring instrument, a stirring unit and an aeration disc are provided in the detection bottle 400.

[0024] Refer to Figure 2 and Figure 3 As shown, the connecting assembly 320 includes a second power unit, a mounting block 321 and two connecting pipes 322. One ends of the two connecting pipes 322 are correspondingly connected to the sludge output port and the sewage output port. The free ends of the two connecting pipes 322 are respectively provided on the mounting block 321, and the mounting block 321 can be driven by the second power unit to move, so as to drive the free ends of the two connecting pipes 322 to be connected to or separated from the sludge inlet and the sewage inlet of one of the detection bottles 400.

[0025] Based on the above structure, in the detection system of this embodiment, the sludge in the biochemical tank 110 can enter the sludge circulation tank 100, and the sewage in the sewage inlet pipe 210 can enter the sewage circulation tank 200. Each detection bottle 400 can rotate with the turntable 311 so that one of the detection bottles 400 rotates to the lower part of the mounting block 321. At this time, the second power unit drives the mounting block 321 to move downward, so that the connecting pipe 322 on the mounting block 321 can communicate with the detection bottle 400 below the mounting block 321, so as to inject the sludge in the sludge circulation tank 100 and the sewage in the sewage circulation tank 200 into the detection bottle 400, so as to detect the toxicity of the sewage through the activity of the sludge. The specific detection method can be seen in the following description.

[0026] In this embodiment, the connection mode between the sludge circulation tank 100 and the biochemical tank 110 is referred to Figure 1 As shown, a circulation pipeline 120 is provided on the biochemical tank 110. Both ends of the circulation pipeline 120 extend into different positions of the biochemical tank 110, and a first pump body 130 is provided on the circulation pipeline 120. The first pump body 130 can enable sludge to enter the circulation pipeline 120 from one end of the circulation pipeline 120 and flow back into the biochemical tank 110 from the other end of the circulation pipeline 120. A connection pipeline 140 is provided between the sludge input port 101 of the sludge circulation tank 100 and the middle of the circulation pipeline 120.

[0027] Through the above structure, the first pump body 130 can make the sludge form a cycle from the biochemical tank 110 to the circulation pipeline 120 and then back to the biochemical tank 110. When detection is required, a part of the sludge can be taken from the circulation pipeline 120 and enter the sludge circulation tank 100 for use. Since the sludge has been circulating in the circulation pipeline 120 all the time, the sludge for detection in the sludge circulation tank 100 is flowing rather than the sludge at a fixed position, which can better ensure the activity of the sludge, and thus can more effectively reflect the toxicity of the sewage inflow and reduce the influence of the sludge.

[0028] Refer to Figure 1 and Figure 4 As shown, an overflow port 102 for overflowing the sludge in the sludge circulation tank 100 is further provided on the sludge circulation tank 100 of this embodiment. Specifically, when the sludge stored in the sludge circulation tank 100 is higher than the overflow port 102, the sludge in the sludge circulation tank 100 will overflow from the overflow port 102 to avoid excessive pressure in the sludge circulation tank 100.

[0029] Refer to Figure 1 and Figure 2 As shown, a sewage discharge port 103 for discharging sludge is provided at the bottom of the sludge circulation tank 100, and the sewage discharge port 103 is connected to a first sewage discharge pipe. A first valve body for opening or closing the sewage discharge pipe is provided on the first sewage discharge pipe.

[0030] In this embodiment, by providing the sewage discharge port 103, the first sewage discharge pipe and the first valve body, when needed, the first valve body can be opened to open the sewage discharge pipe, so that the sludge in the sludge circulation tank 100 can be completely emptied to completely hold new sludge, avoiding mutual contamination of the sludge and affecting the detection results.

[0031] In this embodiment, an air supply pipe is also fixedly installed in the sludge circulation tank 100. The air supply pipe is connected to an external air supply device, so that the air supply device and the air supply pipe can aerate the sludge circulation tank 100. By aerating the sludge circulation tank 100 through the air supply device and the air supply pipe, the activity of the sludge in the sludge circulation tank 100 can be maintained. It should be noted that the air supply pipe and the air supply device can refer to the prior art, and will not be elaborated here, and their structures are not shown in the drawings of this embodiment either.

[0032] Refer to Figure 1 and Figure 4 As shown, in this embodiment, a sludge outlet 104 is also provided on the sludge circulation tank 100. One end of one of the two connecting pipes 322 is communicated with the sludge outlet 104, and a diaphragm metering pump 105 for pumping sludge from the sludge circulation tank 100 into the test bottle 400 is provided on the connecting pipe 322. By providing the diaphragm metering pump 105, sludge can be quantitatively transported into the test bottle 400.

[0033] Refer to Figure 5 As shown, the water sampler in this embodiment includes a cylindrical section 201 and a conical section 202 connected in series, wherein the conical section 202 is located below the cylindrical section 201. A sewage inlet for communicating with the sewage inlet pipe 210 is provided on the cylindrical section 201, and the sewage in the sewage inlet pipe 210 can enter the water sampler through the sewage inlet for detection.

[0034] Refer to Figure 5 As shown, an installation pipe is provided at the bottom end of the conical section 202. The inner hole of the installation pipe is communicated with the inner cavity of the conical section 202. The other end of one of the two connecting pipes 322 is connected to the installation pipe, and a second sewage discharge pipe is provided at the other end of the installation pipe. A second valve body for opening or closing the second sewage discharge pipe is provided on the second sewage discharge pipe. When the second valve body is opened, the sewage in the water sampler can be completely discharged from the second sewage discharge pipe, so that the sewage in the water sampler can be completely updated, and the mutual pollution of sewage can be avoided to affect the detection result.

[0035] In this embodiment, refer to Figure 2 As shown, an installation plate is fixedly installed in the chassis 300. The first power unit is a motor fixedly installed below the installation plate. The motor shaft of the motor passes through the installation plate axially, and the turntable 311 is fixedly sleeved on the motor shaft; and a plurality of blind holes are formed on the installation plate, and each test bottle 400 can be fixedly inserted into each blind hole in a one-to-one correspondence.

[0036] Refer to Figure 2As shown in the figure, an installation disk 330 is fixedly installed inside the chassis 300 and is located below the installation plate. A number of gas supply pipelines 331 are provided on the installation disk 330. One end of each gas supply pipeline 331 on the installation disk 330 is connected to a gas supply device, and the other end passes through the installation plate and is connected to an aeration disk inside the corresponding detection bottle 400.

[0037] In this embodiment, by providing the above-mentioned installation disk 330 and arranging the gas supply pipelines 331 corresponding one-to-one to the aeration disks in the respective detection bottles 400 on the installation disk 330, aeration of the detection bottles 400 can be maintained when the detection bottles 400 rotate with the turntable 311. Specifically, the length of the gas supply pipeline 331 is greater than the distance from the detection bottle 400 to the installation disk 330, so that when the detection bottle 400 rotates with the turntable 311, the connection with the aeration disk in the detection bottle 400 can be maintained through the expansion and contraction of the gas supply pipe.

[0038] In this embodiment, the above-mentioned stirring unit includes a magnetic drive installed on the bottom surface of the blind hole and a magnetic stirrer placed inside the detection bottle 400. It should be noted that the magnetic drive and the magnetic stirrer can adopt existing products, and their structures and working principles will not be elaborated here.

[0039] It should be noted that the cables of the magnetic drive below the detection bottle 400 and the cables connected to the dissolved oxygen meter inside the detection bottle 400 can both adopt the same installation method as the above-mentioned gas supply pipeline 331, which will not be elaborated here and is not shown in the drawings of this embodiment either.

[0040] Reference Figure 1 and Figure 3 As shown in the figure, the detection system of this embodiment further includes a clear water tank 500 and a reagent tank 600. A first interface is further provided on the detection bottle 400; a first pipeline 323 is further provided on the installation block 321. Branch pipes are respectively provided between the clear water tank 500 and the reagent tank 600 and the first pipeline 323. A second pump body is provided on the first pipeline 323, and the first pipeline 323 can be connected to or disconnected from the first interface as the installation block 321 moves.

[0041] Reference Figure 1 and Figure 3 As shown in the figure, a second interface is further provided on the detection bottle 400 of this embodiment. A second pipeline 324 connected to the clear water tank 500 is further provided on the installation block 321. A third pump body is provided on the second pipeline 324, and the second pipeline 324 can be connected to or disconnected from the first interface as the installation block 321 moves.

[0042] In this embodiment, by setting the above structure, when performing detection, the second pump body can pump a fixed amount of clear water and nutrient agents required for microorganisms into the detection bottle 400. When it is necessary to replace the nutrient agent in the reagent tank 600, the second pump body pumps clear water into the detection bottle 400 to clean the first pipeline 323. When the detection is completed and the detection bottle 400 needs to be cleaned, a large amount of clear water can be pumped into the detection bottle 400 by the third pump body through the second pipeline 324 and then discharged through the discharge port of the detection bottle 400 to complete the cleaning of the detection bottle 400.

[0043] The second power unit of this embodiment is a cylinder provided in the chassis 300, and the mounting block 321 is fixedly arranged on the telescopic rod of the cylinder. The two connecting pipes 322, the first pipeline 323 and the second pipeline 324 mentioned above respectively have free ends protruding downward from the mounting block 321.

[0044] Reference Figure 6 As shown, the detection bottle 400 of this embodiment includes a bottle body 410 and a bottle cap assembly. The bottle cap assembly includes a cap body 420 and a closing mechanism. The sludge inlet, the sewage inlet, the first interface and the second interface mentioned above are all through holes 401 provided on the cap body 420. The closing mechanism includes two cover plates 430 slidably arranged on the cap body 420, and a pushing part is provided on the two cover plates 430, and a pushing part is provided on the mounting block 321. When the mounting block 321 moves towards the cap body 420, the pushing part can push the pushing part, so that each through hole 401 is exposed.

[0045] That is to say, in this embodiment, when the above-mentioned mounting block 321 moves downward, the pushing part on the mounting block 321 can push the pushing part on the cover plate 430, so that each through hole 401 on the cap body 420 is exposed, so that each plug on the mounting block 321 can be correspondingly inserted into each through hole 401 to inject corresponding substances into the detection bottle 400.

[0046] In this embodiment, reference Figure 6 As shown, a spring 440 capable of respectively pushing the two cover plates 430 is provided on the detection bottle 400, so that after the mounting block 321 moves upward, the spring 440 pushes the two cover plates 430 to reset to block each through hole 401, thereby closing the detection bottle 400.

[0047] Reference Figure 6As shown in the figure, the pushing part in this embodiment is the inclined surfaces 431 respectively arranged on the two cover plates 430, and the pushing part is the pushing blocks 325 correspondingly arranged on the mounting blocks 321; when the pushing blocks 325 move downward, they can push the corresponding inclined surfaces 431, making the two cover plates 430 move away from each other, so that the through holes 401 are exposed. When the mounting blocks 321 continue to move downward, the free ends can be inserted into the corresponding through holes 401 to complete the connection of the two connecting pipes 322, the first pipeline 323 and the second pipeline 324 with the detection bottle 400.

[0048] Based on the above structure, this embodiment also provides an online detection method for the toxicity of the influent water in a sewage treatment plant, which includes the following steps: S1. Turn on the first pump body 130 to form a cycle of sludge from the self - biochemical tank 110 to the circulation pipeline 120 and then to the biochemical tank 110 by the first pump body 130. S2. Transport sludge to the sludge circulation tank 100 through the circulation pipeline 120, and transport sewage to the sewage circulation tank 200 through the sewage inlet pipe 210. S3. Respectively transport a fixed amount of sludge and sewage from the sludge circulation tank 100 and the sewage circulation tank 200 into the detection bottle 400. After adding a fixed amount of nutrient agent into the detection bottle 400, the following processes are carried out: S31. Aerate the detection bottle 400 until the dissolved oxygen reaches the maximum, and then place it for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real - time throughout the process, and calculate the sludge respiration rate curve 1 through the system. S32. After the process S31 ends, pump a fixed amount of sewage into the detection bottle 400, aerate it until the dissolved oxygen reaches the maximum, and then place it for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real - time, and calculate the sludge respiration rate curve 2 through the system. S33. Judge the toxicity of the sewage by comparing the respiration rate curve 1 and the respiration rate curve 2.

[0049] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An on-line toxicity detection system for the influent of a sewage treatment plant, comprising a sludge circulation tank (100) and a sewage circulation tank (200). The sludge circulation tank (100) has a sludge input port (101) communicating with a biochemical tank (110), and a sludge output port is further provided on the sludge circulation tank (100); the sewage circulation tank (200) has a sewage input port communicating with a sewage inlet pipe (210) of the sewage treatment plant, and a sewage output port is further provided on the sewage circulation tank (200); characterized in that, Further comprising: a chassis (300); a rotating assembly (310), including a first power unit and a turntable (311) disposed within the chassis (300), the turntable (311) being capable of being driven to rotate by the first power unit; and a plurality of test bottles (400) are provided on the turntable (311), each of the test bottles (400) is respectively provided with a sludge inlet and a sewage inlet, and a dissolved oxygen meter, a stirring unit and an aeration disc are provided within the test bottle (400); a connection assembly (320), including a second power unit, a mounting block (321) and two connecting pipes (322), one ends of the two connecting pipes (322) are correspondingly connected to the sludge outlet and the sewage outlet, the free ends of the two connecting pipes (322) are respectively disposed on the mounting block (321), and the mounting block (321) is capable of being driven to move by the second power unit to drive the free ends of the two connecting pipes (322) to connect or separate from the sludge inlet and the sewage inlet of one of the test bottles (400).

2. The on-line toxicity detection system for the influent of the sewage treatment plant according to claim 1, wherein Further comprising a circulation pipeline (120) and a first pump body (130), two ends of the circulation pipeline (120) respectively extend into different positions of the biochemical tank (110), the first pump body (130) is used to form sludge to enter one end of the circulation pipeline (120) from the biochemical tank (110) and return to the biochemical tank (110) through the other end of the circulation pipeline (120), and the sludge circulation tank (100) is communicated with the middle of the circulation pipeline (120).

3. The online toxicity detection system for the influent of the sewage treatment plant according to claim 1, characterized in that A mounting plate is fixedly provided within the chassis (300), the first power unit is a motor fixedly provided below the mounting plate, the motor shaft of the motor axially penetrates through the mounting plate, and the turntable (311) is fixedly sleeved on the motor shaft; and a plurality of blind holes are formed on the mounting plate, and each of the test bottles (400) can be fixedly inserted into each of the blind holes in a one-to-one correspondence manner.

4. The on-line toxicity detection system for the influent of a sewage treatment plant according to claim 3, wherein A mounting disc (330) is fixedly provided within the chassis (300) and located below the mounting plate, a plurality of gas supply pipelines (331) are provided on the mounting disc (330), one ends of the gas supply pipelines (331) located on the mounting disc (330) are connected to an external gas supply device, and the other ends pass through the mounting plate and are connected to the aeration disc within the corresponding test bottle (400).

5. The on-line toxicity detection system for the influent of a sewage treatment plant according to claim 3, wherein The stirring unit includes a magnetic drive disposed on the bottom surface of the blind hole and a magnetic stirrer placed within the test bottle (400).

6. The on-line toxicity detection system for the influent of the sewage treatment plant according to claim 1, wherein Further comprising a clean water tank (500) and a chemical agent tank (600), a first interface is further provided on the test bottle (400); a first pipeline (323) is further provided on the mounting block (321), branch pipes are respectively provided between the clean water tank (500) and the chemical agent tank (600) and the first pipeline (323), a second pump body is provided on the first pipeline (323), and the first pipeline (323) can connect or disconnect from the first interface along with the movement of the mounting block (321).

7. The on-line toxicity detection system for the influent of a sewage treatment plant according to claim 6, wherein The detection bottle (400) is further provided with a second interface. The mounting block (321) is further provided with a second pipeline (324) connected to the clean water tank (500). A third pump body is provided on the second pipeline (324). The second pipeline (324) can be connected to or disconnected from the first interface as the mounting block (321) moves.

8. The online toxicity detection system for the influent of a sewage treatment plant according to any one of claims 1 to 7, characterized in that, The detection bottle (400) includes a bottle body (410) and a bottle cap assembly. The bottle cap assembly includes a cap body (420) and a closing mechanism. The cap body (420) is provided with through holes (401) into which the free ends of the connecting pipes (322) on the mounting block (321) can be inserted. The closing mechanism includes two cover plates (430) slidably arranged on the cap body (420). The two cover plates (430) are provided with thrust receiving portions, and the mounting block (321) is provided with a pushing portion. When the mounting block (321) moves in the direction close to the cap body (420), the pushing portion can push the thrust receiving portions to expose the through holes (401).

9. The online detection system for the toxicity of the influent water of a sewage treatment plant according to claim 8, characterized in that, The thrust receiving portions are inclined surfaces (431) respectively arranged on the two cover plates (430), and the pushing portion is a second inclined surface (431) correspondingly arranged on the mounting block (321) and capable of fitting with the two inclined surfaces (431).

10. An on-line detection method for the toxicity of the influent water of a sewage treatment plant, characterized in that: Apply the on-line detection system for the toxicity of the influent of the sewage treatment plant according to any one of claims 1 to 9, and include the following steps: S1. Turn on the first pump body (130), and the first pump body (130) constitutes a cycle of sludge from the self-aeration tank (110) to the circulation pipeline (120) and then to the aeration tank (110). S2. Convey sludge to the sludge circulation tank (100) through the circulation pipeline (120), and convey sewage to the sewage circulation tank (200) through the sewage inlet pipe (210). S3. Respectively convey a fixed amount of sludge and sewage from the sludge circulation tank (100) and the sewage circulation tank (200) into the detection bottle (400). After adding a fixed amount of nutrient agent into the detection bottle (400), perform the following processes: S31. Aerate the detection bottle (400) until the dissolved oxygen is maximized, and then place it for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real time throughout the process, and calculate the sludge respiration rate curve 1 through the system. S32. After the process S31 ends, pump a fixed amount of sewage into the detection bottle (400), aerate until the dissolved oxygen is maximized, and then place it for 5 - 15 minutes. Record the dissolved oxygen change curve formed by the dissolved oxygen in real time, and calculate the sludge respiration rate curve 2 through the system. S33. Judge the toxicity of the sewage by comparing the respiration rate curve 1 and the respiration rate curve 2.

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