Limited　filamentous　bulking　(LFB)　was　proposed　to　be　a　new　method　for　saving　energy　and　improving　effluent　quality.　In　order　to　validate　the　stability　of　LFB　in　enhanced　biological　phosphorus　removal　(EBPR)　systems,　the　LFB　was　further　achieved　in　a　lab-scale　EBPR　Nutrient　removal　performance　and　microbial　community　structure　including　dominant　filaments　and　polyphosphate-accumulating　organisms　(PAOs)　were　investigated.　Results　showed　that　the　enriched　PAOs　could　alleviate　the　negative　effect　of　low　dissolved　oxygen　concentration　on　sludge　settleability,　making　the　LFB　be　more　easily　achieved　and　maintained　in　the　EBPR　for　long-term　operation.　Sludge　volume　index　was　kept　between　150-200　mL/g　during　the　LFB　period.　Larger　floc　size　(＞=　400　mu　m)　was　commonly　observed　under　the　LFB　state,　which　significantly　enhanced　the　simultaneous　nitrification　and　denitrification　(SND)　efficiency.　An　average　SND　efficiency　of　36%　was　observed　in　the　EBPR　system　when　the　LFB　occurred.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.