ISSN: 2734-9438
Website: www.jomc.vn
Kinetic equation of aerobic granular sludge cultivation in a Sequencing Batch Reactor (SBR) treating municipal wastewater in Vietnam
Abstract
During the formation of aerobic granular sludge in wastewater treatment systems, numerous factors influence the granulation time, granule size, and structural stability of the sludge. The kinetics of granule formation are associated with the increase in granule size over the cultivation period. Kinetic-related factors include the influent organic loading rate, aeration intensity, and the nitrogen-to-COD (N/COD) ratio.In this study, the kinetic equation and the kinetic profile of aerobic granular sludge cultivation using Sequencing Batch Reactor (SBR) technology for domestic wastewater treatment under laboratory conditions in Vietnam are presented. The research was conducted using a laboratory-scale SBR model with a reactor diameter of 0.110 m, a height of 1 m, and a working volume of 2.5 L. Each operational cycle lasted 4 hours and consisted of four phases: a feeding phase of 1–2 minutes, an aeration phase of 180 minutes, a settling phase of 20–30 minutes, and a discharge phase of 10–15 minutes. The influent wastewater with an organic loading rate ranging from 2.7 to 3.0 kg COD/m³·day. The total experimental duration was 140 days. The results indicated that the kinetic model could successfully predict the formation and development of aerobic granular sludge with a reliability coefficient of 0.985 (R² ≈ 0.98).
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