Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater

Abstract

Results obtained from three aerobic granular sludge reactors treating brewery wastewater are presented. Reactors were operated for 60d days in each of the two periods under different cycle duration: (Period I) short 6h cycle, and (Period II) long 12h cycle. Organic loading rates (OLR) varying from 0.7kgCODmd to 4.1kgCODmd were tested. During Period I, granules successfully developed in all reactors, however, results revealed that the feast and famine periods were not balanced and the granular structure deteriorated and became irregular. During Period II at decreased 12h cycle time, granules were observed to develop again with superior structural stability compared to the short 6h cycle time, suggesting that a longer starvation phase enhanced production of proteinaceous EPS. Overall, the extended famine conditions encouraged granule stability, likely because long starvation period favours bacteria capable of storage of energy compounds.

Stratified microbial structure and activity within anode biofilm during electrochemically assisted brewery wastewater treatment

“…The removal rate of the polarized system was maintained at 80.3–81.8%, significantly higher than that of the open‐circuit system (74.6–75.9%; p <.05). The anaerobic treatment of brewery wastewater could remove less than 75% of the COD, while a bioelectrochemical treatment can provide a COD removal rate higher than 80% (Corsino et al, 2017; Tejedor‐Sanz et al, 2018). The results of this and previous studies suggest that the electrode polarization considerably contributed to the removal of organic matter from brewery wastewater.…”

“…Wastewater often contains various suspended inorganic and organic particulates. It is likely that these particulates from brewery wastewater were trapped during the biofilm development (Corsino et al, 2017; Khalfbadam, Ginige, Sarukkalige, Kayaalp, & Cheng, 2016).…”

Activated Sludge and other Aerobic Suspended Culture Processes

“…In the actual treatment process, biogas production and removal of residual pollutants are usually produced in combination with anaerobic and aerobic processes. AGS can be successfully cultured when dealing with actual brewery wastewater (Corsino et. al.…”

Formation of AGS in an Airlift Reactor with Divided Funnels Under Combined Selective Pressure

“…However, the understanding on the capacity of the system to recover the granulation process when instability occurs remained scarce since current research works on continuous variation in the OLR applied have been rarely reported [10]. Most of the works regarding stability as presented in Table S1 have been performed using synthetic wastewater with constant OLR except for Corsino et al [11] and Liu and Tay [12] which used brewery and industrial wastewater, respectively.…”