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29. Effect of feeding regime, batch and continuous, on aerobic granulation process treating industrial soft drink wastewater

Author

Vafaie, M., Zinatizadeh, A.A., and Asadi, A.

Abstract

Aerobic granular sludge process, as an effective biotechnological process, was increasingly drawing the interest of researchers in the area of biological wastewater treatment. In this research, laboratory experiments were conducted to investigate the effect of feeding regime on the granulation process in a sequencing batch reactor (SBR) and continuous feed and intermittent discharge (CFID) bioreactor treating soft drink wastewater. To have a proper comparison between batch and CFID regimes, both bioreactors were operated under the same conditions with the initial chemical oxygen demand (COD) concentrations of 300 and 500 mg/L and cycle time of 4 h. From the results, contrasting to CFID regime, the batch regime was capable to form granular sludge at the applied conditions. To investigate the aerobic granulation process in the CFID bioreactor, hydraulic retention time (HRT) values of 8 and 12 h with idling times of 60 and 90 min, respectively, were examined. In the CFID bioreactor, at HRT of 8 h (CODinof 500 mg/L), the aerobic granules started to be appeared. By increasing HRT to 12 h (CODinof 1,000 mg/L), the aerobic granules were enlarged with more stability. As a conclusion, the higher values of HRT favored the granulation process in the CFID bioreactor. In addition, from the scanning electron microscopic images, the granules formed in the SBR and CFID bioreactor showed different structures.

Published
2017
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