“…The dominance of Proteobacteria phylum observed from 16S rRNA analysis concurs with others [ 39 , 44 ]. At 3 d SRT, Thiothrix eikelboomii , the filamentous sulphur-oxidising bacterium responsible for bulking, loss of performance and sludge washout [ 45 ] dominated as also reported by Xie et al [ 46 ].…”