title: Influence of feeding pattern and hydraulic selection pressure to control filamentous bulking in biological treatment of dairy wastewaters.
abstract: In sequencing batch reactors (SBRs) treating dairy wastewaters, the overgrowth of filamentous bacteria is a frequent cause of operational problems. The present study aimed at understanding to what extent the operating conditions of a SBR can be optimized to convert a bulking activated sludge into a well-settling biomass at low aeration velocity. The abundance of filament morphotypes and floc-formers able to store biopolymers were analysed by PCR-DGGE and 16S amplicon sequencing. The results indicated that a combination of an anaerobic-microaerated feeding pattern with a low selective pressure was beneficial to supress filamentous overgrowth and to form aerobic granules, while increasing the efficiency of suspended solid removal. Average removal efficiencies for total chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) were 94±2%, 95±1% and 83±13%, respectively.
authors.affiliation: CEBEDEAU, Research and Expertise Center for Water, Allée de la Découverte 11 (B53), Quartier Polytech 1, B-4000 Liège, Belgium. Electronic address: cmeunier@cebedeau.be.
authors.forename: Christophe
authors.initials: C
authors.lastname: Meunier
authors.affiliation: Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
authors.forename: Olivier
authors.initials: O
authors.lastname: Henriet
authors.affiliation: CEBEDEAU, Research and Expertise Center for Water, Allée de la Découverte 11 (B53), Quartier Polytech 1, B-4000 Liège, Belgium.
authors.forename: Bastien
authors.initials: B
authors.lastname: Schoonbroodt
authors.affiliation: CEBEDEAU, Research and Expertise Center for Water, Allée de la Découverte 11 (B53), Quartier Polytech 1, B-4000 Liège, Belgium.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Boeur
authors.affiliation: Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
authors.forename: Jacques
authors.initials: J
authors.lastname: Mahillon
authors.affiliation: CEBEDEAU, Research and Expertise Center for Water, Allée de la Découverte 11 (B53), Quartier Polytech 1, B-4000 Liège, Belgium.
authors.forename: Paul
authors.initials: P
authors.lastname: Henry
mesh_terms: D000818:Animals; D001419:Bacteria / Q000254:growth & development* / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D003612:Dairying / Q000379:methods*; D009584:Nitrogen / Q000378:metabolism; D010316:Particle Size; D010758:Phosphorus / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology*
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Aerobic granule; Bulking sludge; Dairy wastewater; Filamentous bacteria; Long-term stability; SBR