Sewage treatment process based on aerobic granular sludge

By employing an intelligent cycle adjustment method based on a granular sludge lifecycle model, the system instability problem of aerobic granular sludge process under influent load shock and mass transfer limitation was solved. This method enabled accurate identification and dynamic control of granular sludge, improving the system's adaptability and stability.

CN121974483APending Publication Date: 2026-05-05NANJING BEIDE ENVIRONMENTAL PROTECTION EQUIP MFG
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Patent Information

Application Number
CN202512040901.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-05-05

AI Technical Summary

Technical Problem

Existing aerobic granular sludge processes lack refined management and are susceptible to influent load shocks, dissolved oxygen changes, and internal mass transfer limitations, leading to abnormally large particle sizes, decreased settling performance, or loose sludge structure, resulting in system instability or even particle disintegration.

Method used

An intelligent cycle adjustment method based on the granular sludge life cycle model is adopted. By collecting parameters such as particle size, settling ratio, density and redox potential of granular sludge, the life cycle index (LCI) is calculated. The aeration time, settling time and sludge discharge ratio are dynamically adjusted according to different life cycle stages. Combined with a multi-index cross-judgment mechanism, the precise identification and dynamic control of granular sludge can be achieved.

Benefits of technology

It improves the adaptability and stability of system operation, avoids large-scale particle disintegration, maintains compact particle structure and high microbial activity, and is suitable for industrial wastewater treatment scenarios with large fluctuations in water quality load.

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Abstract

The invention discloses a sewage treatment process based on aerobic granular sludge, which comprises the following steps: introducing sewage to be treated into a reaction tank, and enabling the sewage to be in contact with the aerobic granular sludge in the reaction tank; aerating the reaction tank; stopping aeration; discharging supernatant of the reaction tank and retaining granular sludge; a proper amount of aged sludge is discharged according to the system operation load, new living sludge is supplemented, and the water inflow is adjusted; the invention discloses intelligent cycle adjustment based on a granular sludge life cycle model. The method comprises the following specific steps: collecting related operation parameters; calculating the life cycle index LCI of the granular sludge; and dynamically adjusting the aeration time, the precipitation time and the sludge discharge proportion of the SBR according to the life cycle stage. According to the method, the life cycle model of the aerobic granular sludge is introduced, and an intelligent cycle adjustment algorithm is constructed in combination with multi-index data such as the particle size, the settling performance and the oxidation-reduction potential, so that accurate identification and dynamic regulation and control of the running state of the aerobic granular sludge are realized.
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