Abstract
Aerobic granular sludge (AGS) as recent biological wastewater treatment has been developed in a modified sequencing batch reactor (SBR) using real textile wastewater. This experiment focused on comparing the effects of different nutrient sources, i.e. fine chemicals and fertilizer, on the characteristics of the AGS. The development of AGS conducted in a reactor that called as aerobic up-flow fluidized bed (AUFB) reactor. AUFB reactor allows the three-steps SBR operation namely filling-and-discharging, reaction, and settling. The developed AGS was characterized through some parameters i.e. physical characteristics (morphology, size distribution, settling velocity, specific gravity), granulation profile (MLSS and SVI), and removal performances (removal of COD and colour). The results showed that the developed AGS has a slight morphological difference as the effect of each nutrient source. Interestingly, metal ions contained in the nutrient sources affect the granulation profile and removal performances. Higher metal ions in the sources tent towards better profile (higher MLSS and lower SVI) but decreased removal performance (lower colour removal). In conclusions, this experiment suggests that the use of fertilizers as the nutrient source in developing AGS is comparable to the use of fine chemicals.
Highlights
Aerobic granular sludge (AGS) become a new standard technology in biological wastewater treatment in the near future [1]
The diagram showed that MLSS in the start-up of conventional SBR 4.5 L (CSBR) and AUFB1 was 13.4 g/L while in AUFB2 was 8.1 g/L
The MLSS was 1.7 g/L in AUFB1 (11th day) and 2.4 g/L in AUFB2 (18th day). This result is comparable to previous study that is 4.7 g/L in 27 days using conventional sequencing batch reactor (SBR) on artificial textile wastewater with reducing settling time strategy [5]. In this experiment, the MLSS in the CSBR was drop to 0.43 g/L on 11th day
Summary
Aerobic granular sludge (AGS) become a new standard technology in biological wastewater treatment in the near future [1]. By such a condition, the floccular activated sludge being developed into granular shape. AGS technology applied commercially both on municipal and industrial wastewater treatment since first full-scale plant launched in 2005 under the name of Nereda® [1]. The amount of treatment plants (in operation, under construction or in design) on municipal wastewater is much more than on industrial wastewater as informed on its official website [4]. Application on more challenging industrial wastewater is still in research, i.e. textile wastewater
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