title: Kinetics of methane production and biodegradation of linear alkylbenzene sulfonate from laundry wastewater.
abstract: This study evaluates the kinetics of methane production and degradation of standard linear alkylbenzene sulfonate (LAS) (50 ± 3.5 mg/L) and LAS from laundry wastewater (85 ± 2.1 mg/L) in anaerobic batch reactors at 30°C with different sources of inoculum. The inocula were obtained by auto-fermentation (AFM) and UASB reactors from wastewater treatment of poultry slaughterhouse (SGH), swine production (SWT) and wastewater treatment thermophilic of sugarcane industry (THR). The study was divided into three phases: synthetic substrate (Phase I), standard LAS (Phase II) and LAS from laundry wastewater (Phase III). For SGH, the highest values for cumulative methane productions (1,844.8 ± 149 µmol-Phase II), methane production rate (70.8 ± 88 µmol/h-Phase II and 4.01 ± 07 µmol/h-Phase III) were observed. The use of thermophilic biomass (THR) incubated at 30°C was not favorable for methane production and LAS biodegradation, but the highest kinetic coefficient degradation (k1app) was obtained for LAS (0.33 ± 0.3 h) compared with mesophilic biomass (SGH and SWT) (0.13 ± 0.02 h). Therefore, both LAS sources influenced the kinetics of methane production and organic matter degradation. For SGH, inoculum obtained the highest LAS degradation. In the SGH inoculum sequenced by MiSeq-Illumina was identified genera (VadinCA02, Candidatus Cloacamonas, VadinHB04, PD-UASB-13) related to degrade toxic compounds. Therefore, it recommended the reactor mesophilic inoculum UASB (SGH) for the LAS degradation.
authors.affiliation: a Department of Hydraulics and Sanitation , School of Engineering of São Carlos, University of São Paulo , São Carlos, São Paulo , Brazil.
authors.forename: Fabrício
authors.initials: F
authors.lastname: Motteran
authors.affiliation: a Department of Hydraulics and Sanitation , School of Engineering of São Carlos, University of São Paulo , São Carlos, São Paulo , Brazil.
authors.forename: Juliana K
authors.initials: JK
authors.lastname: Braga
authors.affiliation: b Department of Chemical Engineering , Federal University of São Carlos , São Carlos, São Paulo , Brazil.
authors.forename: Edson L
authors.initials: EL
authors.lastname: Silva
authors.affiliation: a Department of Hydraulics and Sanitation , School of Engineering of São Carlos, University of São Paulo , São Carlos, São Paulo , Brazil.
authors.forename: Maria Bernadete A
authors.initials: MB
authors.lastname: Varesche
mesh_terms: D017738:Alkanesulfonic Acids / Q000378:metabolism*; D000693:Anaerobiosis; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D007220:Industrial Waste; D007700:Kinetics; D008697:Methane / Q000378:metabolism*; D031786:Saccharum; D013501:Surface-Active Agents / Q000378:metabolism*; D013552:Swine; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D017738:Alkanesulfonic Acids; D007220:Industrial Waste; D008697:Methane; D013501:Surface-Active Agents; D062065:Wastewater; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid
keywords: Anionic surfactant; LAS; mesophilic; recalcitrant; thermophilic; xenobiotic