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Factors affecting SVI in small scale WWTPs
V Kõrgmaa1, M Kriipsalu2, T Tenno3
1Tallinn University of Technology, Ehitajate tee 5, Tallinn, Estonia
Summary
Wastewater treatment plant bulking is linked to pipe infiltration, reactor design, and operational issues. Effective management and operator skill are key to preventing bulking and ensuring compliance.
Area of Science:
- Environmental Engineering
- Microbiology
- Water Quality Management
Background:
- Bulking in wastewater treatment plants (WWTPs) is a common operational challenge affecting sludge settling and effluent quality.
- Small-scale WWTPs present unique challenges due to variations in influent and operational practices.
- Understanding the factors contributing to bulking is crucial for maintaining efficient wastewater treatment.
Purpose of the Study:
- To identify and analyze the key factors associated with sludge bulking in small-scale WWTPs in Estonia.
- To investigate the correlation between operational parameters and sludge settling characteristics.
- To provide insights into preventing bulking and improving process control.
Main Methods:
- Statistical analysis of operational data from 195 small-scale WWTPs.
- Correlation analysis between process parameters and sludge volume index (SVI).
- Analysis of factors influencing the growth of Microthrix parvicella.
Main Results:
- Infiltration, reactor type, operational practices, and influent characteristics were identified as key factors for bulking.
- Anaerobic fraction and volumetric fraction correlated positively with SVI values below 150 ml/g.
- Long solids retention time (SRT), low food-to-microorganism ratio (F/M), and low carbon content were linked to Microthrix parvicella growth.
Conclusions:
- Good operation, maintenance, and operator competence are vital for bulking prevention.
- Relying solely on the 30-minute settling test (V30) can lead to process control errors.
- Instrumentation, control, and automation enhance process stability and reduce bulking probability.
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