title: Effects of hydraulic retention time, co-substrate and nitrogen source on laundry wastewater anionic surfactant degradation in fluidized bed reactors.
abstract: The aim of this study was to evaluate the influence of hydraulic retention time (HRT) on linear alkylbenzene sulfonate (LAS) removal in fluidized bed reactors (FBRs). FBR1 (HRT of 8h) and FBR2 (HRT of 12h) were fed laundry wastewater with 18.6±4.1 to 27.1±5.6mg/L of LAS in the following conditions: ethanol and nitrate addition (Phases I, II and III), nitrate (Phase IV), ethanol (Phase V) and laundry wastewater (Phase VI). LAS removal was 93±12% (FBR1) and 99±2% (FBR2). In FBR1, nitrate influenced significantly on LAS removal (99±3% - Phase IV) compared to the phase without nitrate (90±15% - Phase V). In FBR1 the absence of ethanol was more favourable for LAS removal (99±3% - Phase IV) compared to ethanol addition (87±16% - Phase II). In FBR2, 99±2% LAS removal was found up to 436days. By microbial characterization were identified bacteria as Acinetobacter, Dechloromonas, Pseudomonas and Zoogloea.
authors.affiliation: Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Trabalhador São-carlense Avenue 400, 13566-590 São Carlos, SP, Brazil.
authors.forename: Marcus Vinicius Freire
authors.initials: MVF
authors.lastname: Andrade
authors.affiliation: Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Trabalhador São-carlense Avenue 400, 13566-590 São Carlos, SP, Brazil.
authors.forename: Isabel Kimiko
authors.initials: IK
authors.lastname: Sakamoto
authors.affiliation: Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Trabalhador São-carlense Avenue 400, 13566-590 São Carlos, SP, Brazil.
authors.forename: Juliano José
authors.initials: JJ
authors.lastname: Corbi
authors.affiliation: Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luiz, Km 235, SP 310, 13565-905 São Carlos, SP, Brazil.
authors.forename: Edson Luiz
authors.initials: EL
authors.lastname: Silva
authors.affiliation: Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Trabalhador São-carlense Avenue 400, 13566-590 São Carlos, SP, Brazil. Electronic address: varesche@sc.usp.br.
authors.forename: Maria Bernadete Amâncio
authors.initials: MBA
authors.lastname: Varesche
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D054750:Ecotoxicology / Q000379:methods; D004867:Equipment Design; D059013:Microbial Consortia / Q000235:genetics / Q000502:physiology; D009584:Nitrogen / Q000378:metabolism; D013501:Surface-Active Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D017738:Alkanesulfonic Acids; D009584:Nitrogen; D013501:Surface-Active Agents; D062065:Wastewater; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid
keywords: Ethanol; LAS degradation; Microbial diversity; Nitrate; Toxicity