Enhanced system and method for activated sludge in sewage treatment and application thereof

Abstract

The application provides a sewage treatment activated sludge strengthening system and method and application thereof, and relates to the technical field of sewage treatment. The system adopts a new activated sludge gathering growth core walnut kernel powder, an inverse inorganic separation device, a medium high-density activated sludge flow replacement, long-term medium high-density sludge accumulation separation enrichment and other multiple schemes, systematically and synchronously realizes activated sludge density improvement, sludge inorganicization inhibition, original system sludge age stability maintenance, sludge activity component proportion improvement and system embedded operability and acceptance enhancement, and finally achieves the activated sludge strengthening goal of sewage treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and specifically to an enhanced system and method for activated sludge in wastewater treatment. Background Technology

[0002] The activated sludge process is one of the commonly used processes in municipal wastewater treatment and is one of the most prevalent existing processes in the wastewater treatment industry. However, with the increase in urban population size and density, the volume and fluctuation of wastewater within the collection area of ​​existing wastewater treatment plants will increase. Therefore, wastewater treatment plants based on the activated sludge process will experience increased treatment loads, and existing wastewater treatment systems will face the need for in-situ expansion. Generally, this need can be met by enhancing the performance of activated sludge without changing the existing facilities.

[0003] Enhancing the performance of activated sludge in wastewater treatment plants can be achieved by increasing the proportion of MLVSS (mixed liquor volatile suspended solids) to MLSS (mixed liquor suspended solids), thereby improving the sludge's activity. It's also necessary to increase the sludge density in the system to improve its settling performance and enhance the wastewater treatment facility's ability to cope with hydraulic load fluctuations. A common method is the addition of activated sludge carriers, i.e., the MBBR (moving bed biofilm reactor) process. This simply increases the biofilm in a local unit to increase the system's resistance to load shocks, without substantially altering the activated sludge system itself. Another method is activated sludge densification, which involves adding inorganic materials such as diatomaceous earth, attapulgite, powdered activated carbon, and polyaluminum iron salts as microbial aggregation nuclei to increase the activated sludge density. High-density activated sludge is then extracted through cyclone separation, discarding low-density activated sludge. However, this process involves the accumulation of heavy inorganic matter from the added materials and wastewater, and sludge sorting, leading to the sludge becoming more inorganic. Although the density and settling performance of activated sludge are improved, the content of the active ingredient MLVSS decreases, thus reducing its ability to degrade pollutants. Furthermore, activated sludge cyclone separation processes are typically added directly to the pipeline from the secondary settling tank to the anaerobic tank. Activated sludge is separated by cyclone separation at a certain flow rate, and the discarded light sludge is directly discharged. This reduces the total return flow rate of activated sludge and increases the amount of discharged sludge, thereby shortening the sludge age of the original activated sludge system. Alternatively, heavy sludge can be directly added to the original system after cyclone separation of the discharged sludge from the original secondary settling tank, reducing the total sludge discharge but increasing the system's sludge age. Both of these methods disrupt the stability of the original activated sludge system. Therefore, there is an urgent need for an activated sludge enhancement technology that can prevent inorganication and avoid sludge age interference. Summary of the Invention

[0004] This invention aims to overcome the deficiencies in existing technologies and provide an enhanced system, method, and application for activated sludge in wastewater treatment. The system employs multiple innovative solutions, including novel activated sludge aggregation and growth using walnut kernel powder, reverse inorganic separation device, mid-stage high-density activated sludge flow replacement, and long-term mid-stage high-density sludge accumulation, separation, and enrichment. The system simultaneously and systematically achieves increased activated sludge density, inhibits sludge inorganication, maintains stable sludge age in the original system, increases the proportion of active components in the sludge, and enhances the operability and acceptability of system integration, ultimately achieving the goal of enhanced activated sludge in wastewater treatment.

[0005] The technical solution adopted in this invention is as follows: An enhanced activated sludge system for wastewater treatment, characterized in that it comprises a primary sedimentation tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, and a sludge thickening tank connected in sequence. The sludge thickening tank is equipped with a thickening isolation tank, the anaerobic tank is equipped with an anaerobic isolation tank, the anoxic tank is connected to a growth nucleus addition device, and the sludge thickening tank is connected in sequence to a reverse inorganic separation device, a separation sludge temporary storage tank, and a dual-channel sludge pump. The dual-channel sludge pump is connected to the anoxic tank.

[0006] Preferably, the enhanced activated sludge system for wastewater treatment includes: a mixed liquor return pipe between the anoxic tank and the aerobic tank; and an activated sludge return pipe between the anaerobic tank and the secondary sedimentation tank.

[0007] Preferably, the enhanced system for activated sludge in wastewater treatment includes: the inorganic separation device comprising an external sludge extraction pipe, a separated sludge output pipe, a discarded sludge output pipe, a heavy sludge separator, and a light sludge separator; one end of the external sludge extraction pipe is connected to a thickening and isolation tank, and the other end is connected to the inlet of the heavy sludge separator.

[0008] Preferably, in the enhanced activated sludge system for wastewater treatment, the inlet of the heavy sludge separator is connected to the sludge extraction pipe, the light sludge outlet of the heavy sludge separator is connected to the discarded sludge output pipe, and the heavy sludge outlet of the heavy sludge separator is connected to the inlet of the light sludge separator.

[0009] Preferably, in the enhanced activated sludge system for wastewater treatment, the inlet of the light sludge separator is connected to the heavy sludge outlet of the heavy sludge separator, the heavy sludge outlet of the light sludge separator is connected to the discarded sludge output pipe, the light sludge outlet of the light sludge separator is connected to the sorted sludge output pipe, one end of the sorted sludge output pipe is connected to the light sludge outlet of the light sludge separator, and the other end is connected to the sorted sludge temporary storage tank.

[0010] Preferably, the enhanced activated sludge system for wastewater treatment includes: the dual-channel sludge pump comprising an input sludge inlet pipe, an input sludge outlet pipe, an output sludge inlet pipe, and an output sludge outlet pipe; the input sludge inlet pipe is connected to a sludge sorting tank; the input sludge outlet pipe is connected to an anaerobic tank; the output sludge inlet pipe is connected to an anaerobic tank isolation tank; and the output sludge outlet pipe is connected to a thickening isolation tank.

[0011] Preferably, in the enhanced system for activated sludge in wastewater treatment, the growth nucleus addition device is located above the anoxic tank, and the growth nucleus material in the growth nucleus addition device is peach pit powder with a particle size of 0.1-2 mm.

[0012] A method for enhancing activated sludge in wastewater treatment, comprising the following steps: Step S1. Pre-enhancement of activated sludge aggregation: In order to improve the aggregation of activated sludge in the activated sludge system and facilitate the separation of high-density sludge in the middle stage, growth nuclei need to be added first for microorganisms to attach, aggregate and grow. Peach pit powder is selected as the growth nuclei. The growth nuclei are added to the inlet of the anaerobic tank, anoxic tank and aerobic tank. After the growth nuclei are added, the activated sludge system continues to run for more than 7 days. Step S2. Constructing an activated sludge enhancement system for wastewater treatment: Construct the system in the wastewater treatment system according to the structure and connection method of the activated sludge enhancement system for wastewater treatment described above; Step S3. Continuous sorting of high-density sludge in the middle stage: Start the reverse inorganic separation device to extract the discharged activated sludge from the thickening and isolation tank to the heavy sludge separator of the reverse inorganic separation device, separate the heavy activated sludge from the activated sludge, and input the separated heavy activated sludge into the light sludge separator to separate the light activated sludge, and transport the light activated sludge to the sludge temporary storage tank. Step S4. Equal replacement of high-density sludge in the middle stage: Start the dual-channel sludge pump, and extract the light activated sludge from the sorting sludge tank through the input sludge inlet pipe and inject it into the anaerobic tank through the input sludge outlet pipe. At the same time, the output sludge inlet pipe of the dual-channel sludge pump extracts the fresh return activated sludge from the anaerobic isolation tank at the same flow rate as the light activated sludge injected into the anaerobic tank and discharges it into the thickening isolation tank through the output sludge outlet pipe. Step S5. The growth nucleus feeding device is kept running continuously, and growth nuclei are fed into the growth nucleus feeding device every day.

[0013] Preferably, in the method for enhancing activated sludge for wastewater treatment, the following steps are described: in step S1, the particle size of the peach pit powder is 0.1-2 mm, and the amount of growth nuclei added is 0.1‰ to 2‰ of the volume of the sludge-water mixture in the anaerobic, anoxic, and aerobic tanks; in step S3, the proportion of heavy activated sludge in the sorted sludge is 5% to 95%; the proportion of light activated sludge in the sorted sludge is 95% to 5%; and in step S5, the addition ratio of growth nuclei is 0.01‰ to 0.2‰ of the total volume of the sludge-water mixture.

[0014] An application of an enhanced method for activated sludge in wastewater treatment, wherein the method is applied to activated sludge systems for treating wastewater from the dyeing and printing industry and wastewater from the agricultural product processing industry.

[0015] The beneficial effects of this invention are: (1) The wastewater treatment activated sludge enhancement method of the present invention uses peach pit powder as the growth nucleus. Peach pit powder biomass as the activated sludge enhancement growth nucleus has better microbial affinity and is easy for microorganisms to attach. Because its density is close to that of water, it is not easy to be centrifuged by the hydrocyclone separator and has a low loss rate. The natural organic components can be decomposed by microorganisms to provide a slow-release carbon source, which is beneficial to the health and stability of the activated sludge system. (2) The wastewater treatment activated sludge enhancement system of the present invention adopts a reverse inorganic separation device, and the combined use of heavy separator and light separator makes both low-density activated sludge and high-density inorganic matter discharged, and only the mid-stage high-density activated sludge with higher density and activity is retained; the forward and reverse combination separation method of the two separators can prevent the accumulation effect of heavy inorganic matter contained in the original wastewater due to unidirectional heavy screening, and prevent the inorganicization of sludge enhancement process.

[0016] (2) The enhanced system for activated sludge in wastewater treatment of the present invention adopts a dual-channel sludge pump. Since the input and output channels of the dual-channel sludge pump have the characteristic of equal flow, the return activated sludge in the original wastewater treatment system is replaced by the mid-stage high-density sludge with equal flow. Therefore, the total amount of return activated sludge does not change, and the replacement of the mid-stage high-density sludge with equal flow will not change the sludge age of the original wastewater treatment system, thus avoiding the impact on the sludge age of the original wastewater treatment system.

[0017] (4) The enhanced activated sludge system for wastewater treatment of the present invention, through long-term accumulation and sorting of high-density sludge in the middle stage, will gradually increase the amount of high-density sludge in the middle stage of the wastewater treatment system. The high-density sludge in the middle stage can maintain or increase the proportion of MLVSS (volatile suspended solids in mixed liquor) in the activated sludge in MLSS (mixed liquor suspended solids), thereby increasing the abundance of active ingredients and enhancing the performance of activated sludge in treating wastewater. The high-density sludge in the middle stage screened by the present invention can increase both sludge density and the proportion of active ingredients.

[0018] (5) The activated sludge enhancement system for wastewater treatment of the present invention is an independent system design. When the activated sludge enhancement system is installed, it does not change any pipelines and structures of the original wastewater treatment system. It can be embedded without any impact. The activated sludge enhancement system and method are friendly to the original wastewater treatment system and are more operable and acceptable in application.

[0019] (6) The wastewater treatment activated sludge enhancement method of the present invention adopts multiple innovative schemes, including the aggregation and growth of activated sludge using walnut kernel powder, reverse inorganic separation device, equal flow replacement of mid-stage high-density sludge, and long-term accumulation, separation and enrichment of mid-stage high-density sludge. The system simultaneously achieves increased activated sludge density, inhibits sludge inorganication, maintains stable sludge age of the original system, and increases the proportion of active components in the sludge. It has high operability and acceptability for integration into the system. Attached Figure Description

[0020] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the wastewater treatment process in the prior art of this invention.

[0022] Figure 2 This is a schematic diagram of an activated sludge enhancement system according to the present invention.

[0023] Figure 3 is a schematic diagram of the reverse inorganic sorting device of the present invention.

[0024] In the diagram, 11: Primary sedimentation tank, 12: Anaerobic tank, 13: Anoxic tank, 14: Aerobic tank, 15: Secondary sedimentation tank, 16: Sludge thickening tank, 17: Mixed liquor return pipe, 18: Activated sludge return pipe, 21: Thickening and isolation tank, 22: Reverse inorganic separation device, 23: Sludge temporary storage tank, 24: Dual-channel sludge pump, 25: Anaerobic isolation tank, 26: Growth nucleus addition device, 221: External sludge extraction pipe, 222: Sludge output pipe, 223: Waste sludge output pipe, 224: Heavy separator; 225: Light separator; 241: Dual-channel sludge pump inlet pipe, 242: Dual-channel sludge pump inlet and outlet pipe, 243: Dual-channel sludge pump outlet pipe, 244: Dual-channel sludge pump outlet pipe. Detailed Implementation

[0025] Example 1 An enhanced activated sludge system for wastewater treatment includes a primary sedimentation tank 11, an anaerobic tank 12, an anoxic tank 13, an aerobic tank 14, a secondary sedimentation tank 15, and a sludge thickening tank 16 connected in sequence. The sludge thickening tank 16 contains a thickening isolation tank 21. The anaerobic tank 12 contains an anaerobic isolation tank 25. The anoxic tank 13 is connected to a growth nucleus addition device 26. The sludge thickening tank 16 is connected in sequence to a reverse inorganic separation device 22, a separation sludge temporary storage tank 23, and a dual-channel sludge pump 24. The dual-channel sludge pump 24 is connected to the anoxic tank 13.

[0026] Thickening and isolation tank 21, located within the sludge thickening tank 16 of the original wastewater treatment system, is used to isolate a separate area for the extraction of fresh, discharged activated sludge. Reverse inorganic separation device 22, situated between the sludge thickening tank 16 and the separation sludge storage tank 23, is used to separate intermediate high-density sludge and inhibit the inorganication of activated sludge. Separation sludge storage tank 23, located between the reverse inorganic separation device 22 and the dual-channel sludge pump 24, is used to regulate and temporarily store the separated intermediate high-density sludge. The dual-channel sludge pump, positioned between the separation sludge storage tank 23 and the anaerobic tank 13, is used to input intermediate high-density sludge and output an equal volume of returned ordinary activated sludge. Anaerobic isolation tank 21, located within the anaerobic tank 12, is used to isolate a separate area for the extraction of fresh, externally returned sludge.

[0027] In one implementation, a mixed liquor return pipe 17 is provided between the anoxic tank 13 and the aerobic tank 14; and an activated sludge return pipe 18 is provided between the anaerobic tank 12 and the secondary sedimentation tank 15.

[0028] In one implementation, the inorganic sorting device 22 includes an external sludge extraction pipe 221, a sorted sludge output pipe 222, a discarded sludge output pipe 223, a heavy sludge separator 224, and a light sludge separator 225. One end of the external sludge extraction pipe 221 is connected to the thickening and isolation tank 21, and the other end is connected to the inlet of the heavy sludge separator 224. The external sludge extraction pipe 221 is used to extract the external sludge from the thickening and isolation tank 21 to the heavy sludge separator 224.

[0029] In one implementation, the inlet of the heavy sludge separator 224 is connected to the external sludge extraction pipe 221, the light sludge outlet of the heavy sludge separator 224 is connected to the discarded sludge output pipe 223, and the heavy sludge outlet of the heavy sludge separator 224 is connected to the inlet of the light sludge separator 225, which is used to separate out activated sludge with higher density.

[0030] In one implementation, the inlet of the light sludge separator 225 is connected to the heavy sludge outlet of the heavy sludge separator 224, the heavy sludge outlet of the light sludge separator 225 is connected to the discarded sludge output pipe 223, and the light sludge outlet of the light sludge separator 225 is connected to the sorted sludge output pipe 222. This is used to separate the less dense activated sludge from the higher density activated sludge, i.e., the intermediate high-density sludge, which can remove heavier inorganic impurities and inhibit the accumulation and inorganicization of activated sludge.

[0031] One end of the sorting sludge output pipe 222 is connected to the light sludge outlet of the light sludge separator 225, and the other end is connected to the sorting sludge temporary storage tank 23, for conveying the sorted intermediate high-density sludge.

[0032] In one implementation, the dual-channel sludge pump 24 includes an input sludge inlet pipe 241, an input sludge outlet pipe 242, an output sludge inlet pipe 243, and an output sludge outlet pipe 244. The input sludge inlet pipe 241 is connected to the sludge sorting tank 23, the input sludge outlet pipe 242 is connected to the anaerobic tank 12, the output sludge inlet pipe 243 is connected to the anaerobic tank isolation tank 25, and the output sludge outlet pipe 244 is connected to the thickening isolation tank 21.

[0033] In one embodiment, the growth nucleus addition device 26 is disposed above the anoxic pool 13. The growth nucleus material in the growth nucleus addition device 26 is peach pit powder with a particle size of 0.1-2mm, which is used to add peach pit powder growth nuclei into the anoxic pool 13.

[0034] Example 2 A method for enhancing activated sludge in wastewater treatment, comprising the following steps: Step S1. Pre-enhancement of activated sludge aggregation: To improve the aggregation of activated sludge in the activated sludge system and facilitate the later separation of high-density sludge in the middle stage, growth nuclei need to be added first for microorganisms to attach, aggregate, and grow. The growth nuclei material is peach pit powder with a particle size of 0.1-2mm. The growth nuclei are added at the inlet of each tank at a rate of 0.1‰ to 2‰ of the volume of the sludge-water mixture in the anaerobic tank 12, anoxic tank 13, and aerobic tank 14 of the wastewater treatment system. After addition, the activated sludge system continues to operate for more than 7 days. Step S2. Constructing an activated sludge enhancement system for wastewater treatment: Construct the system in the wastewater treatment system according to the structure and connection method of the activated sludge enhancement system for wastewater treatment described above; Step S3. Continuous sorting of high-density sludge in the middle stage: Start the reverse inorganic separation device 22 to extract the discharged activated sludge from the thickening and isolation tank 21 to the heavy sludge separator 224 of the reverse inorganic separation device 22. The heavy activated sludge in the activated sludge is separated out, and the proportion of the separated heavy activated sludge is 5%~95%. The separated heavy activated sludge is then fed into the light sludge separator 225 to separate out the light activated sludge. The proportion of the separated light activated sludge in the activated sludge is... For example, 95%~5% of the inorganic matter in the activated sludge can be removed by this method, achieving the purpose of reverse screening, preventing the accumulation of inorganic matter caused by unidirectional screening, and avoiding the inorganicization of activated sludge. The combined use of heavy separator 224 and light separator 225 ensures that both low-density activated sludge and high-density inorganic matter are discharged, leaving only the mid-stage high-density activated sludge with higher density and activity, and transporting the light activated sludge to the sludge temporary storage tank 23. Step S4. Equal-volume replacement of high-density sludge in the middle stage: Start the dual-channel sludge pump 24. The light activated sludge in the sorting sludge tank 23 is extracted from the inlet sludge pipe 241 and injected into the anaerobic tank 12 through the inlet sludge pipe 242. At the same time, the fresh return activated sludge entering the anaerobic isolation tank 25 is extracted from the outlet sludge pipe 243 of the dual-channel sludge pump 24 and discharged into the thickening isolation tank 21 through the outlet sludge pipe 244. Since the inlet and outlet channels of the dual-channel sludge pump 24 have equal flow characteristics, the return activated sludge in the original sewage treatment system is replaced by the high-density activated sludge in the middle stage with equal flow. Therefore, the total amount of activated sludge returned to the anaerobic tank 12 does not change. The equal-flow replacement of high-density activated sludge in the middle stage will not change the sludge age of the original sewage treatment system, will not damage the stability of the original system, and can continuously accumulate and increase the density of activated sludge in the original sewage treatment system, improve the performance of activated sludge in treating sewage, and achieve the goal of stabilizing and strengthening activated sludge. Step S5. Maintaining Activated Sludge Aggregation: Due to the continuous growth of activated sludge, excess activated sludge needs to be discharged, and some growth nuclei will also be discharged. It is necessary to continuously add growth nuclei to maintain the aggregation of activated sludge. Therefore, after the activated sludge enhancement system is started, the growth nuclei addition device 26 is continuously turned on, and growth nuclei are continuously added daily at a rate of 0.01‰~0.2‰ of the total volume of the sludge-water mixture in the biochemical treatment unit. The activated sludge system can maintain stable enhancement.

Claims

1. An enhancement system for activated sludge in wastewater treatment, characterized in that: The system includes a primary sedimentation tank (11), an anaerobic tank (12), an anoxic tank (13), an aerobic tank (14), a secondary sedimentation tank (15), and a sludge thickening tank (16) connected in sequence. A thickening isolation tank (21) is set in the sludge thickening tank (16). An anaerobic isolation tank (25) is set in the anaerobic tank (12). A growth nucleus addition device (26) is connected to the anoxic tank (13). A reverse inorganic separation device (22), a separation sludge temporary storage tank (23), and a dual-channel sludge pump (24) are connected in sequence to the sludge thickening tank (16). The dual-channel sludge pump (24) is connected to the anoxic tank (13).

2. The enhanced system for activated sludge in wastewater treatment according to claim 1, characterized in that: A mixed liquor return pipe (17) is provided between the anoxic tank (13) and the aerobic tank (14); an activated sludge return pipe (18) is provided between the anaerobic tank (12) and the secondary sedimentation tank (15).

3. The enhanced system for activated sludge in wastewater treatment according to claim 1, characterized in that: The inorganic sorting device (22) includes an external sludge extraction pipe (221), a sorted sludge output pipe (222), a discarded sludge output pipe (223), a heavy separator (224), and a light separator (225). One end of the external sludge extraction pipe (221) is connected to the thickening and isolation tank (21), and the other end is connected to the inlet of the heavy separator (224).

4. The enhanced system for activated sludge in wastewater treatment according to claim 3, characterized in that: The inlet of the heavy mass separator (224) is connected to the external sludge extraction pipe (221), the light sludge outlet of the heavy mass separator (224) is connected to the discarded sludge output pipe (223), and the heavy sludge outlet of the heavy mass separator (224) is connected to the inlet of the light mass separator (225).

5. The enhanced system for activated sludge in wastewater treatment according to claim 3, characterized in that: The inlet of the light separator (225) is connected to the heavy mud outlet of the heavy separator (224), the heavy mud outlet of the light separator (225) is connected to the discarded mud output pipe (223), the light mud outlet of the light separator (225) is connected to the sorted mud output pipe (222), one end of the sorted mud output pipe (222) is connected to the light mud outlet of the light separator (225), and the other end is connected to the sorted mud temporary storage tank (23).

6. The enhanced system for activated sludge in wastewater treatment according to claim 3, characterized in that: The dual-channel sludge pump (24) includes an input sludge inlet pipe (241), an input sludge outlet pipe (242), an output sludge inlet pipe (243), and an output sludge outlet pipe (244). The input sludge inlet pipe (241) is connected to the sludge sorting tank (23), the input sludge outlet pipe (242) is connected to the anaerobic tank (12), the output sludge inlet pipe (243) is connected to the anaerobic tank isolation tank (25), and the output sludge outlet pipe (244) is connected to the thickening isolation tank (21).

7. The enhanced system for activated sludge in wastewater treatment according to claim 1, characterized in that: The nucleus feeding device (26) is located above the anoxic pool (13), and the nucleus material in the nucleus feeding device (26) is peach kernel powder with a particle size of 0.1-2 mm.

8. A method for enhancing activated sludge in wastewater treatment, characterized in that: Includes the following steps: Step S1. Pre-enhancement of activated sludge aggregation in the original wastewater treatment system: Peach pit powder is selected as the growth nucleus and added to the inlet of the anaerobic tank (12), the anoxic tank (13), and the aerobic tank (14). After the growth nucleus is added, the activated sludge system continues to run for more than 7 days. Step S2. Construct the wastewater treatment activated sludge enhancement system: Construct the system according to the structure and connection method of the wastewater treatment activated sludge enhancement system; Step S3. Continuous sorting of high-density sludge in the middle section: Start the reverse inorganic separation device (22) to extract the discharged activated sludge from the thickening isolation tank (21) to the heavy sludge separator (224) of the reverse inorganic separation device (22), sort out the heavy activated sludge in the activated sludge, and input the sorted heavy activated sludge into the light sludge separator (225) to sort out the light activated sludge, and transport the light activated sludge to the sludge temporary storage tank (23); Step S4. Mid-section high-density sludge equal flow rate replacement: Start the dual-channel sludge pump (24), and use the input sludge inlet pipe (241) to extract the light activated sludge from the sorting sludge tank (23) and inject it into the anaerobic tank (12) through the input sludge outlet pipe (242). At the same time, the output sludge inlet pipe (243) of the dual-channel sludge pump (24) extracts the fresh return activated sludge from the anaerobic isolation tank (25) at the same flow rate as the light activated sludge injected into the anaerobic tank, and discharges it into the thickening isolation tank (21) through the output sludge outlet pipe (244). Step S5. Maintaining the aggregation of activated sludge: The growth nucleus addition device (26) is kept on continuously, and growth nuclei are added to the growth nucleus addition device (26) every day.

9. The method for enhancing activated sludge in wastewater treatment according to claim 8, characterized in that: In step S1, the particle size of the peach pit powder is 0.1-2 mm, and the amount of growth nuclei added is 0.1‰~2‰ of the volume of the mud-water mixture in the anaerobic tank (12), anoxic tank (13), and aerobic tank (14); in step S3, the proportion of heavy activated sludge in the sorted activated sludge is 5%~95%; the proportion of light activated sludge in the sorted activated sludge is 95%~5%; in step S5, the addition ratio of growth nuclei is 0.01‰~0.2‰ of the total volume of the mud-water mixture.

10. An application of the enhanced activated sludge method for wastewater treatment according to claim 8, characterized in that: This method has been applied to wastewater treatment systems in the dyeing and printing industry and the agricultural product processing industry using the activated sludge process.

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