مجله آب و فاضلاب

مجله آب و فاضلاب

Integrated OSA, Ultrasonication and Oxidation for Excess Sludge Reduction in a Sequencing Batch Reactor

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسندگان
سارا نظیف 1
سروناز مصوری 2
زهرا اکبری 3
سیدتقی امید نائینی 1
1 Assoc. Prof., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 MSc., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
3 Assist. Prof., School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
10.22093/wwj.2026.555360.3523
چکیده
Among the various methods developed to reduce excess sludge in activated sludge processes, the Oxic-Settling-Anoxic process has attracted considerable attention due to its low cost, operational simplicity, and compatibility with existing wastewater treatment plants. When OSA process is integrated with a Sequencing Batch Reactor system, a portion of the activated sludge from the SBR is passed through an anaerobic side-stream reactor and then returned to the aerobic reactor. This approach promotes endogenous decay and uncouples catabolism from anabolism, resulting in less excess sludge production. In this study, the performance of the OSA process was enhanced by integrating ultrasonication and hydrogen peroxide (H₂O₂) oxidation in a laboratory-scale SBR. A pilot system was operated under different configurations, including a conventional SBR (as control system), OSA, OSA combined with ultrasonication, OSA integrated with H₂O₂ oxidation, and the combined OSA, ultrasonication and H₂O₂ system. The system performance was evaluated using the biomass yield coefficient (Y), sludge reduction efficiency, and COD removal efficiency. The Y for SBR was determined as 0.70 mg MLVSS/mg COD removed. Incorporating the OSA process reduced Y to 0.20 mg MLVSS/mg COD removed, corresponding to approximately 71% sludge reduction. Adding ultrasonication and H₂O₂ oxidation to the system decreased Y to 0.16 and 0.15 mg MLVSS/mg COD removed, representing sludge reductions of approximately 77% and 79%, respectively. The combined OSA, ultrasonication and H₂O₂ system achieved the lowest Y of 0.11 mg MLVSS/mg COD removed, showing an overall sludge reduction of 85%, while COD removal efficiency is remaining above 85%. The results demonstrate that combining biological (OSA), mechanical (ultrasonication), and chemical (H₂O₂ oxidation) treatments provides a synergistic approach for minimizing excess sludge production while preserving satisfactory treatment performance. This integrated strategy highly reduces the sludge management costs and environmental impacts in activated sludge wastewater treatment systems which is of high importance.
کلیدواژه‌ها
Wastewater Treatment
Biological Sludge Reduction
Oxic-Settling-Anoxic
Sequencing Batch Reactor
Ultrasonication
H2O2 Oxidant
Excess Sludge
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مجله آب و فاضلاب

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انتشار آنلاین از 02 دی 1403