The reactors also demonstrated relatively various nutrient removal performances. More than 50% of acetate was utilized during the anoxic feeding phase in SBR40, while in SBR30 and SBR50 less than 50% of acetate was consumed during 60 min of anoxic feeding phase. However, the leftover acetate was utilized efficiently during the aerobic phase apparently due to the presence of most of the substrate (oxygen and nitrate) which is advantageous for the uptake rate of acetate by the microorganisms as described by de Kreuk et al. (2005b) leading to the highest removal rate of 98.17% for COD at 50°C, while 95.37% and 85.37% removal rate of COD achieved at the temperature of 40°C and 30°C, respectively which is comparable to previous situation reported by Song et al. (2009) in synthetic wastewater treatments using aerobic granules. Nitrification process also took part quite differently for all the reactors with the production of nitrite and nitrate. Interestingly, excellent ammonia removal started to happen in SBR30 after 2 weeks of operation, meanwhile for SBR40 and SBR50, great ammonia removal began after 3 weeks of operation. This occurred perhaps due to assimilation of biomass formation (Song et al., 2009). The highest ammonia removal rate was 97.50% achieved at 30°C, whereas ammonia removal rate at 40°C and 50°C were 94.64% and 94.45%, respectively which is comparable to the results in previous publications by Song et al. (2009) in treating synthetic wastewater using aerobic granular sludge.