A biological multiplication based sewage treatment system

Abstract

The present application relates to sewage treatment technical field, especially to a kind of sewage treatment system based on biological doubling. Aerobic module;Anaerobic module;Precipitation module;Analysis module is used to determine whether the operation of sewage treatment system meets preset standard according to nitrogen content, meets preset standard, and the corresponding operating parameter of the anaerobic module is adjusted to corresponding value by analysis module;If not meet preset standard, analysis module corrects the determination standard according to the water level in aerobic module, or determines the reason of not meeting preset standard.Compared with prior art, the beneficial effects of the present application are that the present application detects the nitrogen content of aerobic module and compares with preset standard, to determine whether the operation of sewage treatment system meets preset standard, and adjusts the corresponding operating parameter to corresponding value in time, thereby increasing the processing efficiency of sewage treatment system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment system based on biological multiplication. BACKGROUND

[0002] In a sewage biological treatment system based on biological multiplication process, not only is high aeration efficiency required, but also uniform DO concentration in the aeration zone is required; a contradiction between low dissolved oxygen aeration and high active sludge concentration is prone to occur. For example, in order to meet the low dissolved oxygen, the aeration power is low, and high content of active sludge is prone to sludge precipitation, thereby easily leading to reduction of sludge concentration and affecting the treatment effect, and the settled sludge also affects the work of the aeration pipe at the bottom of the aeration zone (for example, causing the aeration pipe to be blocked); if the aeration amount is increased, the denitrification efficiency is also prone to be low. Therefore, in the specific application of the sewage biological treatment system based on the biological multiplication process, the realization of the engineering effect is highly dependent on the advanced aeration technology of the aeration zone, especially the aeration pipe technology arranged at the bottom of the aeration zone, and the denitrification effect is limited. For the treatment of sewage with high concentration of ammonia nitrogen (NH3-N) (for example, spandex wastewater, tannery wastewater, etc.), or when the ammonia nitrogen content of the sewage at the front end of the aeration zone is relatively high, the denitrification effect is difficult to meet the standards.

[0003] Chinese patent publication No. CN104045154A discloses a sewage biological treatment system based on a biological contact oxidation process, which comprises a treatment tank and an integrated water inlet zone, a lifting zone, an aeration zone and a sludge-water separation zone arranged in the treatment tank; the aeration zone is configured to include a plurality of sub-zones, and a biological membrane filler is arranged in each sub-zone; the plurality of sub-zones are in any combination of two or more of an anaerobic zone, an anoxic zone and an aerobic zone. It can be seen that the sewage biological treatment system based on the biological contact oxidation process has the following problems: real-time monitoring of the sewage treatment process cannot be performed, adjustment cannot be performed in time when it is determined that the operation is abnormal, and the treatment efficiency is low. SUMMARY

[0004] Therefore, the present application provides a sewage treatment system based on biological multiplication to overcome the problem of low treatment efficiency in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a sewage treatment system based on biological multiplication. The sewage treatment system comprises:

[0006] The aerobic module comprises a dispersion plate arranged at an intermediate position of the aerobic module to disperse the sewage entering the aerobic module, a filling base layer arranged at the bottom of the aerobic module to promote autotrophic denitrification, a drainage short pipe arranged at the bottom of the aerobic module to discharge the sewage from the aerobic module, an oxygen content detector arranged in the aerobic module to detect the oxygen content, and a nitrogen content detector arranged in the aerobic module to detect the nitrogen content.

[0007] an anaerobic module arranged below the aerobic module and separated from the aerobic module by a partition, comprising a submersible sewage pump arranged at the bottom of the anaerobic zone to pump sludge in the anaerobic module into the aerobic module;

[0008] a sedimentation module comprising a circular sedimentation tank for sedimentation of sewage sludge and a sludge scraping plate, the anaerobic module being arranged in the middle of the circular sedimentation tank and being connected to the bottom of the sedimentation tank through a lifting mechanism;

[0009] an analysis module connected to the aerobic module, the anaerobic module and the sedimentation module respectively, to determine whether the operation of the sewage treatment system meets the preset standard according to the nitrogen content measured by the nitrogen content sensor in the aerobic module, and to adjust the corresponding operation parameter of the anaerobic module to the corresponding value according to the nitrogen content if the analysis module determines that the operation of the sewage treatment system meets the preset standard;

[0010] If the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module corrects the determination standard according to the water level in the aerobic module, or determines the reason why the preset standard is not met.

[0011] Further, the analysis module determines whether the operation of the sewage treatment system meets the preset standard according to the nitrogen content of the aerobic module measured by the detection unit, and adjusts the power of the submersible sewage pump to the corresponding value according to the nitrogen content if the analysis module determines that the operation of the sewage treatment system meets the preset standard.

[0012] If the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module corrects the first preset nitrogen content to the corresponding value according to the water level in the aerobic module, or determines the reason why the preset standard is not met according to the oxygen content measured by the detection unit.

[0013] Further, when the analysis module determines that the operation of the sewage treatment system meets the preset standard, the analysis module records the difference between the first preset nitrogen content and the nitrogen content as a nitrogen content difference value and sets several adjustment modes for the power of the submersible sewage pump according to the nitrogen content difference value, and the adjustment range of each adjustment mode for the power of the submersible sewage pump is different.

[0014] Further, when the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module sets several correction modes for the first preset nitrogen content according to the water level in the aerobic module, and the adjustment range of each correction mode for the first preset nitrogen content is different.

[0015] Further, the analysis module determines whether the operation of the sewage treatment system meets the preset standard according to the nitrogen content under a first preset condition, and determines the reason why the operation of the sewage treatment system does not meet the preset standard according to the oxygen content of the aerobic module measured by the detection unit when the analysis module determines that the operation of the sewage treatment system does not meet the preset standard.

[0016] The first preset condition is that the analysis module completes the correction of the primary preset nitrogen content and records the corrected primary preset nitrogen content as a corrected nitrogen content.

[0017] Further, when the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module determines the reason why the operation of the sewage treatment system does not meet the preset standard according to the oxygen content of the aerobic module measured by the detection unit, which includes that the flow rate of wastewater in the aerobic module is greater than a preset standard, and the oxygen diffusion of the aerobic module is uneven.

[0018] Further, when the analysis module determines that the reason why the operation of the sewage treatment system does not meet the preset standard is that the flow rate of wastewater in the aerobic module is greater than a preset standard, the analysis module records the difference between the oxygen content and the preset oxygen content as an oxygen content difference, and sets a plurality of power adjustment modes for the submerged sewage pump according to the oxygen content difference, and the adjustment amplitudes of the power of the submerged sewage pump for each adjustment mode are different.

[0019] Further, when the analysis module determines that the reason why the operation of the sewage treatment system does not meet the preset standard is that the oxygen diffusion of the aerobic module is uneven, the analysis module records the difference between the preset oxygen content and the oxygen content as a standard difference, and sets a plurality of height adjustment modes for the anaerobic module according to the standard difference, and the adjustment amplitudes of the height for each adjustment mode are different.

[0020] Further, the analysis module determines the speed adjustment mode for the mud scraping plate according to the selected adjustment mode under a second preset condition, and the adjustment amplitudes of the speed of the mud scraping plate for each speed adjustment mode are different.

[0021] The second preset condition is that the analysis module completes the adjustment of the height of the anaerobic module.

[0022] Further, a submerged sewage pump is arranged at the bottom of the anaerobic module, the water inlet pipe of the submerged sewage pump is located in the middle of the anaerobic reaction zone, and the water outlet pipe of the submerged sewage pump is located in the upper middle part of the aerobic zone and penetrates through the dispersion plate.

[0023] Compared with the prior art, the beneficial effects of the present application are that, by detecting the nitrogen content of the aerobic module and comparing it with the preset standard, the present application determines whether the operation of the sewage treatment system meets the preset standard, so that when it is determined that the preset standard is not met, the corresponding operating parameter is adjusted to the corresponding value in time, thereby increasing the processing efficiency of the sewage treatment system; on the other hand, the present application helps water flow by adopting a cylindrical pool body; the present patent, by cooperating with the filling base layer containing rare earth tailings and pyrite matrix, helps to control low dissolved oxygen, realizes longitudinal short-cut nitrification / denitrification, helps to control high sludge concentration, and ensures efficient and stable treatment, thereby further improving the processing efficiency of the sewage treatment system.

[0024] Further, the present application compares the measured nitrogen content in the aerobic module with the preset standard periodically, thereby determining in time whether the operation of the sewage treatment system meets the preset state, and adjusting in time when it is determined that the preset operation state is not met, thereby further improving the processing efficiency of the sewage treatment system.

[0025] Further, the present application compares the nitrogen content difference with the preset standard, and can quickly select the corresponding power adjustment coefficient according to the actual situation, so as to quickly adjust the power of the submersible pump to the corresponding value, ensure the treatment effect, and speed up the processing speed, thereby further improving the processing efficiency of the sewage treatment system.

[0026] Further, the present application corrects the first preset nitrogen content according to the water level in the aerobic module, thereby determining whether the operation of the sewage treatment system meets the preset standard, so as to detect the oxygen content to further determine the reason when it is determined that the preset standard is not met, thereby further improving the processing efficiency of the sewage treatment system.

[0027] Further, the present application re-determines whether the operation of the sewage treatment system meets the preset standard after the correction is completed, thereby multi-level determining the actual situation, increasing the detection accuracy, and thereby further improving the processing efficiency of the sewage treatment system.

[0028] Further, the present application detects the oxygen content to determine the reason why the sewage treatment system does not meet the preset standard, thereby performing corresponding operations according to the determined reason, thereby quickly correcting the problem, and thereby further improving the processing efficiency of the sewage treatment system.

[0029] Further, the present application calculates the standard deviation and compares it with the preset standard, thereby selecting the corresponding power adjustment coefficient according to the actual situation, so as to adjust the power of the submersible pump to the corresponding value, thereby reducing the flow rate of wastewater in the aerobic module, and thereby further improving the processing efficiency of the sewage treatment system.

[0030] Further, the present application can select the corresponding adjustment coefficient to adjust the height of the anaerobic module according to the actual situation by calculating the standard deviation value and comparing with the preset standard, avoid over-adjustment or under-adjustment caused by using the same adjustment coefficient, thereby quickly and accurately adjusting, and further improve the processing efficiency of the sewage treatment system.

[0031] Further, the present application further improves the processing efficiency of the sewage treatment system by synchronously adjusting the speed of the mud scraping plate when adjusting the height of the anaerobic module.

[0032] Further, the present application further improves the processing efficiency of the sewage treatment system. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structural block diagram of the sewage treatment system based on biological multiplication according to the present application is shown in the figure;

[0034] Figure 2 The structural schematic diagram of the sewage treatment system based on biological multiplication according to the present application is shown in the figure;

[0035] Figure 3 The determination flow chart of the determination mode according to the present application is shown in the figure;

[0036] Figure 4 The determination flow chart of the correction mode according to the present application is shown in the figure. DETAILED DESCRIPTION

[0037] In order to make the purpose and advantages of the present application more clear and explicit, the present application is further described below in combination with examples; it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0038] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application.

[0039] It should be noted that in the description of the present application, the terms indicating the direction or position relationship such as "up", "down", "left", "right", "in", "out" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] Furthermore, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense and for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] Please refer to Figure 1 Fig. 1 is a structural block diagram of the biological multiplication-based sewage treatment system according to the present application, which will be combined with Figure 2 Fig. 2 is a structural schematic diagram of the biological multiplication-based sewage treatment system according to the present application, which includes:

[0042] The aerobic module 1 includes a dispersion plate 11 arranged at the middle position of the aerobic module to disperse the sewage entering the aerobic module, a filling base 12 arranged at the bottom of the aerobic module to promote autotrophic denitrification reaction, a drainage short pipe 13 arranged at the bottom of the aerobic module to discharge the sewage from the aerobic module, an oxygen content detector 14 arranged to detect the oxygen content in the aerobic module, and a nitrogen content detector 15 arranged to detect the nitrogen content;

[0043] The anaerobic module 2 is arranged below the aerobic module and is separated from the aerobic module by a partition plate, and includes a sludge pump 21 arranged at the bottom of the anaerobic zone to pump the sludge in the anaerobic module into the aerobic module;

[0044] The sedimentation module 3 includes a circular sedimentation tank 31 to sediment the sewage sludge and a mud scraping plate 32 to scrape the mud, and the anaerobic module is arranged at the middle of the circular sedimentation tank and is connected with the bottom of the sedimentation tank and is connected by a lifting mechanism 33;

[0045] The analysis module 4 (not shown in the figure) is connected with the aerobic module, the anaerobic module and the sedimentation module respectively and is arranged on the outer wall of the sedimentation zone of the sewage treatment system, to determine whether the operation of the sewage treatment system meets the preset standard according to the nitrogen content measured by the nitrogen content sensor in the aerobic module, and if the analysis module determines that the operation of the sewage treatment system meets the preset standard, the analysis module adjusts the corresponding operation parameters of the anaerobic module to the corresponding values according to the nitrogen content;

[0046] If the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module corrects the determination standard according to the water level in the aerobic module, or determines the reason why the preset standard is not met.

[0047] Specifically, the analysis module determines whether the operation of the sewage treatment system meets the preset standard according to the nitrogen content of the aerobic module measured by the detection unit, wherein:

[0048] The first determination mode is that the analysis module determines that the operation of the sewage treatment system meets the preset standard, and the analysis module adjusts the power of the submersible pump to a corresponding value according to the nitrogen content; the first determination mode meets the nitrogen content being less than a first preset nitrogen content preset in the analysis module; the first preset nitrogen content is set to 5 mg / L;

[0049] The second determination mode is that the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, and the analysis module corrects the first preset nitrogen content to a corresponding value according to the water level in the aerobic module; the second determination mode meets the nitrogen content being greater than or equal to the first preset nitrogen content and less than or equal to a second preset nitrogen content preset in the analysis module; the second preset nitrogen content is set to 8 mg / L;

[0050] The third determination mode is that the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, and the analysis module determines the reason why the operation of the sewage treatment system does not meet the preset standard according to the oxygen content measured by the detection unit; the third determination mode meets the nitrogen content being greater than the second preset nitrogen content.

[0051] Specifically, in the first determination mode, the analysis module records the difference between the first preset nitrogen content and the nitrogen content as a nitrogen content difference and determines the adjustment mode of the power of the submersible pump according to the nitrogen content difference, wherein:

[0052] The first adjustment mode is that the analysis module adjusts the power of the submersible pump to a corresponding value using a first adjustment coefficient; the first adjustment mode meets the nitrogen content difference being less than a first preset nitrogen content difference preset in the analysis module; the first adjustment coefficient is set to 1.10, and the first preset nitrogen content difference is set to 0.7 mg / L;

[0053] The second adjustment mode is that the analysis module adjusts the power of the submersible pump to a corresponding value using a second adjustment coefficient; the second adjustment mode meets the nitrogen content difference being greater than or equal to the first preset nitrogen content difference and less than or equal to a second preset nitrogen content difference preset in the analysis module; the second adjustment coefficient is set to 1.30, and the second preset nitrogen content difference is set to 1.5 mg / L;

[0054] The third adjustment mode is that the analysis module adjusts the power of the submersible pump to a corresponding value using a third adjustment coefficient; the third adjustment mode meets the nitrogen content difference being greater than the second preset nitrogen content difference; the third adjustment coefficient is set to 1.50.

[0055] Specifically, the analysis module determines a correction mode for the first preset nitrogen content according to the water level in the aerobic module under the second determination mode, wherein:

[0056] The first correction mode is that the analysis module corrects the first preset nitrogen content to a corresponding value by using a first correction coefficient; the first correction mode satisfies that the water level is greater than a first preset water level preset in the analysis module; the first correction coefficient is set to 1.25, and the first preset water level is 1.5 m;

[0057] The second correction mode is that the analysis module corrects the first preset nitrogen content to a corresponding value by using a second correction coefficient; the second correction mode satisfies that the water level is less than or equal to the first preset water level and greater than or equal to a second preset water level preset in the analysis module; the second correction coefficient is set to 1.20, and the second preset water level is 0.8 m; the third correction mode is that the analysis module corrects the first preset nitrogen content to a corresponding value by using a third correction coefficient; the third correction mode satisfies that the water level is less than the second preset water level; the third correction coefficient is set to 1.15.

[0058] Specifically, the analysis module determines a second determination mode for determining whether the operation of the sewage treatment system meets a preset standard according to the nitrogen content under a first preset condition, wherein:

[0059] The first second determination mode is that the analysis module determines that the operation of the sewage treatment system meets the preset standard; the first second determination mode satisfies that the nitrogen content is less than a corrected nitrogen content;

[0060] The second second determination mode is that the analysis module determines that the operation of the sewage treatment system does not meet the preset standard and determines the reason why the operation of the sewage treatment system does not meet the preset standard according to the oxygen content of the aerobic module measured by the detection unit; the first second determination mode satisfies that the nitrogen content is less than the corrected nitrogen content;

[0061] The first preset condition is that the analysis module completes the correction for the first preset nitrogen content and records the corrected first preset nitrogen content as the corrected nitrogen content.

[0062] Specifically, the analysis module determines, in the third determination mode, a cause for the operation of the sewage treatment system not satisfying the preset standard according to the oxygen content of the aerobic module measured by the detection unit, wherein: the first cause determination mode is that the analysis module determines that the cause for the operation of the sewage treatment system not satisfying the preset standard is that the flow rate of the wastewater in the aerobic module is greater than the preset standard, and the analysis module adjusts the power of the submersible pump to a corresponding value according to the oxygen content; the first cause determination mode satisfies that the oxygen content is greater than the preset oxygen content 0.15 mg / L in the analysis module;

[0063] The second cause determination mode is that the analysis module determines that the cause for the operation of the sewage treatment system not satisfying the preset standard is that the oxygen diffusion of the aerobic module is uneven, and the analysis module adjusts the height of the anaerobic module to a corresponding value according to the oxygen content; the second cause determination mode satisfies that the oxygen content is less than or equal to the preset oxygen content.

[0064] Specifically, the analysis module records the difference between the oxygen content and the preset oxygen content as an oxygen content difference value in the first cause determination mode, and determines the power adjustment mode for the submersible pump according to the oxygen content difference value, wherein:

[0065] The first power adjustment mode is that the analysis module selects a first power adjustment coefficient to adjust the power of the submersible pump to a corresponding value; the first power adjustment mode satisfies that the oxygen content difference value is less than or equal to a first preset oxygen content difference value set in the central control module; the first power adjustment coefficient is set to 0.95, and the first preset oxygen content difference value is 0.06 mg / L;

[0066] The second power adjustment mode is that the analysis module selects a second power adjustment coefficient to adjust the power of the submersible pump to a corresponding value; the second power adjustment mode satisfies that the oxygen content difference value is less than or equal to a second preset oxygen content difference value and greater than or equal to a first preset oxygen content difference value set in the analysis module; the second power adjustment coefficient is set to 0.85, and the second preset oxygen content is 0.12 mg / L;

[0067] The third power adjustment mode is that the analysis module selects a third power adjustment coefficient to adjust the power of the submersible pump to a corresponding value; the second power adjustment mode satisfies that the oxygen content difference value is less than the second preset oxygen content difference value; the third power adjustment coefficient is set to 0.75.

[0068] Specifically, the analysis module records the difference between the preset oxygen content and the oxygen content as a standard difference value in the second cause determination mode, and determines the height adjustment mode for the anaerobic module according to the standard difference value, wherein:

[0069] The first height adjustment mode is that the analysis module adjusts the height of the anaerobic module to a corresponding value by using a first height adjustment coefficient; the first height adjustment mode satisfies that the standard deviation is less than a first preset standard deviation value set in the analysis module; the first height adjustment coefficient is set as 0.95, and the first preset standard deviation value is 0.05 mg / L.

[0070] The second height adjustment mode is that the analysis module adjusts the height of the anaerobic module to a corresponding value by using a second height adjustment coefficient; the second height adjustment mode satisfies that the standard deviation is greater than or equal to the first preset standard deviation value and less than or equal to a second preset standard deviation value set in the analysis module; the second height adjustment coefficient is set as 0.90, and the second preset standard deviation value is 0.10 mg / L.

[0071] The third height adjustment mode is that the analysis module adjusts the height of the anaerobic module to a corresponding value by using a third height adjustment coefficient; the third height adjustment mode satisfies that the standard deviation is greater than the second preset standard deviation value; the third height adjustment coefficient is set as 0.85.

[0072] Specifically, the analysis module determines a speed adjustment mode for the mud scraping plate according to the selected adjustment mode under a second preset condition, wherein:

[0073] The first speed adjustment mode is that the analysis module adjusts the speed of the mud scraping plate to a corresponding value by using a first speed adjustment coefficient; the first speed adjustment mode satisfies that the analysis module adjusts the height of the anaerobic module to a corresponding value by using the first height adjustment coefficient; the first speed adjustment coefficient is set as 1.10.

[0074] The second speed adjustment mode is that the analysis module adjusts the speed of the mud scraping plate to a corresponding value by using a second speed adjustment coefficient; the second speed adjustment mode satisfies that the analysis module adjusts the height of the anaerobic module to a corresponding value by using the second height adjustment coefficient; the second speed adjustment coefficient is set as 1.20.

[0075] The third speed adjustment mode is that the analysis module adjusts the speed of the mud scraping plate to a corresponding value by using a third speed adjustment coefficient; the third speed adjustment mode satisfies that the analysis module adjusts the height of the anaerobic module to a corresponding value by using the third height adjustment coefficient; the third speed adjustment coefficient is set as 1.30.

[0076] The second preset condition is that the analysis module completes the adjustment of the height of the anaerobic module.

[0077] Specifically, a sewage pump is arranged at the bottom of the anaerobic module, the water inlet of the sewage pump is located in the middle of the anaerobic reaction zone, and the water outlet of the sewage pump is located in the middle and upper part of the aerobic zone and penetrates through the dispersion plate.

[0078] The technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will fall within the protection scope of the present application.

[0079] The above description is only the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sewage treatment system based on biological multiplication, characterized in that: include: The aerobic module includes: a dispersion plate disposed in the middle of the aerobic module for dispersing sewage entering the aerobic module, a filling base disposed at the bottom of the aerobic module for promoting autotrophic denitrification reaction, a short drainage pipe disposed at the bottom of the aerobic module for discharging sewage from the aerobic module, an oxygen content detector for detecting oxygen content in the aerobic module, and a nitrogen content detector for detecting nitrogen content; The anaerobic module is arranged below the aerobic module and separated from the aerobic module by a partition, and includes a submersible sewage pump arranged at the bottom of the anaerobic zone for pumping the sludge in the anaerobic module into the aerobic module; The sedimentation module comprises: a circular sedimentation tank for settling sewage sludge and a scraper for scraping the sludge, wherein the anaerobic module is arranged in the middle of the circular sedimentation tank, and the anaerobic module is connected to the bottom of the sedimentation tank and connected via a lifting mechanism; an analysis module, connected to the aerobic module, the anaerobic module, and the sedimentation module, respectively, for determining whether the operation of the sewage treatment system meets a preset standard based on the nitrogen content measured by the nitrogen content sensor in the aerobic module; if the analysis module determines that the operation of the sewage treatment system meets the preset standard, the analysis module adjusts the corresponding operating parameters of the anaerobic module to corresponding values ​​based on the nitrogen content; If the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the analysis module modifies the determination standard according to the water level in the aerobic module, or determines the reason why the preset standard is not met.

2. The sewage treatment system based on biological multiplication according to claim 1, characterized in that: The analysis module determines whether the operation of the sewage treatment system meets the preset standard based on the nitrogen content of the aerobic module measured by the nitrogen content detector. If the analysis module determines that the operation of the sewage treatment system meets the preset standard, the analysis module adjusts the power of the submersible sewage pump to a corresponding value based on the nitrogen content; If the analysis module determines that the operation of the sewage treatment system does not meet the preset standards, the analysis module corrects the first-level preset nitrogen content to a corresponding value according to the water level in the aerobic module, or determines the reason why the operation of the sewage treatment system does not meet the preset standards based on the oxygen content measured by the detection unit.

3. The sewage treatment system based on biological multiplication according to claim 2, characterized in that: When the analysis module determines that the operation of the sewage treatment system meets the preset standards, the difference between the first-level preset nitrogen content and the nitrogen content is recorded as the nitrogen content difference and several adjustment methods for the power of the submersible sewage pump are set according to the nitrogen content difference, and the adjustment range of the power of the submersible sewage pump for each adjustment method is different.

4. The sewage treatment system based on biological multiplication according to claim 2, characterized in that: When the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, several correction methods for the first-level preset nitrogen content are set according to the water level in the aerobic module, and the adjustment range of each correction method for the first-level preset nitrogen content is different.

5. The sewage treatment system based on biological multiplication according to claim 4, characterized in that: The analysis module performs a secondary determination on whether the operation of the sewage treatment system meets a preset standard based on the nitrogen content under a first preset condition, and when the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, determines the reason why the operation of the sewage treatment system does not meet the preset standard based on the oxygen content of the aerobic module measured by the detection unit; The first preset condition is that the analysis module completes the correction of the first-level preset nitrogen content and records the corrected first-level preset nitrogen content as the corrected nitrogen content.

6. The sewage treatment system based on biological multiplication according to claim 2, characterized in that: When the analysis module determines that the operation of the sewage treatment system does not meet the preset standard, the reasons for determining that the operation of the sewage treatment system does not meet the preset standard include: the flow rate of the wastewater in the aerobic module is greater than the preset standard, and the oxygen diffusion of the aerobic module is uneven.

7. The sewage treatment system based on biological multiplication according to claim 6, characterized in that: When the analysis module determines that the operation of the sewage treatment system does not meet the preset standard because the flow rate of the wastewater in the aerobic module is greater than the preset standard, the difference between the oxygen content and the preset oxygen content is recorded as the oxygen content difference, and several power adjustment methods for the submersible sewage pump are set according to the oxygen content difference, and the adjustment range of the power of the submersible sewage pump for each adjustment method is different.

8. The sewage treatment system based on biological multiplication according to claim 6, characterized in that: When the analysis module determines that the operation of the sewage treatment system does not meet the preset standard due to uneven oxygen diffusion in the aerobic module, the difference between the preset oxygen content and the oxygen content is recorded as a standard deviation value and a plurality of height adjustment methods for the anaerobic module are set according to the standard deviation value, and each adjustment method has a different height adjustment method.

9. The sewage treatment system based on biological multiplication according to claim 8, characterized in that: The analysis module determines a speed adjustment method for the scraper blade according to the selected adjustment method under the second preset condition, and each speed adjustment method has a different adjustment range for the speed of the scraper blade; The second preset condition is that the analysis module completes the adjustment of the height of the anaerobic module.

10. The sewage treatment system based on biological multiplication according to claim 4, characterized in that: A submersible sewage pump is arranged at the bottom of the anaerobic module, the water inlet of the submersible sewage pump is located in the middle of the anaerobic reaction zone, and the water outlet of the submersible sewage pump is located in the upper middle of the aerobic zone and passes through the dispersion plate.

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