Abstract
The present study demonstrated that aerobic granular sludge is capable of treating livestock wastewater from a cattle farm in a sequencing batch reactor (SBR) without the presence of support material. A lab scale SBR was operated for 80d using 4h cycle time with an organic loading rate (OLR) of 9kg CODm−3d−1. Results showed that the aerobic granules were growing from 0.1 to 4.1mm towards the end of the experimental period. The sludge volume index (SVI) was 42mlg−1 while the biomass concentration in the reactor grew up to 10.3gL−1 represent excellent biomass separation and good settling ability of the granules. During this period, maximum COD, TN and TP removal efficiencies (74%, 73% and 70%, respectively) were observed in the SBR system, confirming high microbial activity in the SBR system.
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