Optimized design of a sequencing batch reactor (SBR) for efficient municipal wastewater treatment
摘要
This study presents a comprehensive and optimized design for a Sequencing Batch Reactor (SBR) system tailored for municipal wastewater treatment in resort areas characterized by significant hydraulic and organic load variability. The design explicitly addresses peak and off-peak seasonal fluctuations through strategic tank sizing, flexible cycle control, and an integrated automation strategy. Key process parameters include a Hydraulic Retention Time (HRT) of 1.92 days, a Sludge Retention Time (SRT) of 16 days, and a Mixed Liquor Suspended Solids (MLSS) concentration of 3,617 mg/L, achieving target effluent qualities of BOD₅ ≤ 20 mg/L and TSS ≤ 20 mg/L. Energy optimization is a central focus, achieved using shared fine-bubble aeration blowers operating at less than 50% of the cycle time, resulting in a specific energy consumption of 0.939 kWh/m3, which is competitive with modern wastewater treatment plants. A robust PLC-based control system manages sequencing, aeration, and sludge wasting, enhancing resilience to shock loads. The sludge management strategy yields 1,125 kg of dry solids per day, which are aerobically stabilized and dewatered to 16–25% solids concentration, producing biosolids suitable for agricultural reuse. This work provides a validated, sustainable design framework that bridges the gap between conventional systems and advanced, cost-intensive technologies, offering a practical and efficient solution for wastewater treatment under highly variable conditions.