Abstract
This study developed a control system using pH and DO sensors to dynamically control an aerobic granular sludge (AGS) reactor while varying the influent chemical oxygen demand (COD) with a high COD to phosphate ratio (COD/P ratio). The AGS reactor was operated in an anaerobic/aerobic sequence. The pH profile was used to control the anaerobic step and the oxygen uptake rate (OUR) was applied to control the aerobic step. AGS was successfully formed and retained for 220 days. The sludge volume index, SVI5 and SVI30 remained below 50 ml/g and the average granule size (DV50) increased to approximately 500 μm. The anaerobic and aerobic step durations were effectively controlled guaranteeing (1) an optimal anaerobic COD uptake, which is key to granulation and (2) a good effluent quality.
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