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Views: 0 Author: Site Editor Publish Time: 2025-06-11 Origin: Site
Provide sufficient oxygen: Restore the respiratory activity of aerobic bacteria.
Degrade inhibitors / intermediate products: Continuous aeration helps microorganisms gradually degrade or adapt to residual toxic substances or accumulated refractory intermediate products.
Promote endogenous respiration of microorganisms: Without new food (influent), microorganisms consume their stored substances, which helps eliminate decaying bacteria and leaves more active bacterial species.
Improve sludge properties: Promote the re - formation of flocs and improve sedimentation performance.
Avoid excessive DO: Excessively high DO (such as long - term > 5 - 6 mg/L) may lead to excessive oxidation and disintegration of sludge, which will damage the floc structure. Especially for restorative MSA, it can be slightly higher (such as 3 - 5 mg/L) in the initial stage, and should be adjusted to the normal range (2 - 3 mg/L) in the later stage.
Ensure uniformity: Check whether the aeration is uniform to avoid dead corners and anaerobic areas. Start the aeration equipment (blower, surface aerator, etc.) to provide sufficient oxygen to the mixed liquor in the tank.
Dissolved Oxygen (DO): This is the most important control index for MSA! Usually, DO needs to be maintained at a relatively high level of 2.0 - 4.0 mg/L. However, it should be noted that:
Monitor Key Indicators: During MSA, close monitoring is required to judge the effect and decide when to end:
Dissolved Oxygen: Continuously monitor to ensure it is within the target range.
Sludge Concentration: Regularly measure the mixed liquor suspended solids concentration.
Sludge Sedimentation Performance: Regularly conduct sludge settlement ratio tests, observe the settlement speed, the clarity of the supernatant, whether the sludge interface is clear, and whether there is floating sludge or bulking phenomenon. This is the most intuitive index to judge the recovery of sludge activity and the improvement of properties.
Chemical Oxygen Demand / Biochemical Oxygen Demand: Monitor the changes of COD or BOD5 in the tank to see if pollutants are effectively degraded. A significant decrease and stabilization of concentration is a sign of effective MSA.
pH Value: Monitor pH changes to avoid abnormal fluctuations in pH due to microbial metabolic activities (such as excessive nitrification leading to pH drop).
Microscopic Observation: If possible, observe the microbial phase of the sludge, check the structure of flocs, the activity and species changes of protozoa and metazoa, which is an important basis for judging the health status of the sludge.
Initial Cultivation Stage: It may take several days to a week or even longer (combined with intermittent influent MSA).
Activity Recovery / Pollutant Degradation: Usually takes several hours to dozens of hours.
When the following situations are observed, MSA can be considered to end:
The SV30 sedimentation performance is significantly improved (faster settlement, clearer supernatant, clear sludge - water interface).
The COD/BOD5 in the tank decreases significantly and stabilizes.
The dissolved oxygen consumption rate tends to be stable (indicating that easily degradable substances are basically consumed).
The microbial activity under the microscope is enhanced, and the flocs are compact.
Definition: MSA = Stop water + Continuous aeration.
Purpose: Rapidly cultivate/restore sludge activity, degrade specific pollutants, and respond to impacts.
Core: Provide sufficient and appropriate dissolved oxygen.
Key Operations: Control DO (2 - 4 mg/L, avoid excessive high), closely monitor sedimentation performance (SV30) and pollutant concentration changes (COD/BOD).
Time: Flexible, determined by monitoring indicators, end when the effect is achieved.
Nature: It is a temporary and intensive biological treatment method.
Taboo: Cannot be used for a long time, otherwise it will lead to sludge disintegration and aging. It is only a "first - aid measure" or "booster" to help the system get through difficulties or complete start - up, not a daily operation mode.
