5TH International Congress on Technology - Engineering & Science - Kuala Lumpur - Malaysia (2018-02-01)

Effect Of Reaction Time On Performance Of Aerobic Granular System

Undesired settling property of sludge is a widespread problematic issue in wastewater treatment plants (WWTP). Aerobic granulation technology is a newly suggested solution for poor settling sludge. The performance of aerobic granular systems depends on several parameters such as substrate composition, dissolved oxygen (DO) and reaction time. In this study, at reaction times of 12 and 24 h, nutrients removal efficiency and the settleability of aerobic granular sludge (AGS) were investigated. At reaction time of 12 h, average ammonium removal of 45% was achieved. Also, at extended reaction time of 24 h, 99.9% of ammonium content was oxidized. More than 90% total phosphorus removal was obtained at both reaction times. Moreover, in 12 h runs, average SVI30/SVI5 was around 0.6 which indicates floccular sludge was dominant; while in 24 h runs, the sludge tended to be more granular as SVI5, SVI10 and SVI30 were decreased to 37.5, 33.1 and 27.6 mL/g MLSS, respectively. Finally, aerobic biogranules possessed dense and compact structure with less filamentous growth on the exterior surface, which led to enhanced settling property. Keywords: Aerobic granular sludge (AGS), Floccular sludge, Settling properties, Sequential batch reactor
Ali Matinfar, Ghasem Najafpour, Soheil Neshat