title: Nutrient removal performance and microbial community structure in an EBPR system under the limited filamentous bulking state.
abstract: 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 μm) 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.
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China. yx106@emails.bjut.edu.cn
authors.forename: Xiong
authors.initials: X
authors.lastname: Yang
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.forename: Nanqi
authors.initials: N
authors.lastname: Ren
authors.forename: Jianhua
authors.initials: J
authors.lastname: Guo
authors.forename: Xiaoxue
authors.initials: X
authors.lastname: Tang
authors.forename: Jichen
authors.initials: J
authors.lastname: Song
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D005427:Flocculation; D017404:In Situ Hybridization, Fluorescence; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology; D014873:Water Pollutants / Q000302:isolation & purification
chemical_list: D009584:Nitrogen; D010100:Oxygen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater; D014873:Water Pollutants
keywords: EBPR; Filamentous bacteria; Limited filamentous bulking; Microbial community structure; SND