Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luiz, Km 235, SP 310, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Science of The Total Environment;
NOV 1 2018.
Web of Science Citations:
In this study, the microbial community characterization and metabolic pathway identification involved in the linear alkylbenzene sulfonated (LAS) degradation from commercial laundry wastewater in a fluidized bed reactor (FBR) on an increased scale were performed using the Illumina MiSeq platform. Ethanol and non-ionic surfactant (LAE, Genapol C-100) were used as co-substrates. The FBR was operated in five operational phases: (I) synthetic substrate for inoculation; (II) 7.9 +/- 4.7 mg/L LAS and 11.7 +/- 6.9 mg/L LAE; (III) 19.4 +/- 12.9 mg/L LAS, 19.6 +/- 9.2 mg/L LAE and 205 mg/L ethanol; (IV) 25.9 +/- 11 mg/L LAS, 19.5 +/- 9.1 mg/L LAE and 205 mg/L ethanol and (V) 43.9 +/- 18 mg/L LAS, 25 +/- 9.8 mg/L LAE and 205 mg/L ethanol. At all operation phases, organic matter was removed from 40.4 to 85.1% and LAS removal was from 24.7 to 56%. Sulfate-reducing bacteria (SRB) were identified in the biofilm of FBR in all operational phases. Although the LAS promoted a toxic effect on the microbiota, this effect can be reduced when using biodegradable co-substrates, such as ethanol and LAE, which was observed in Phase IV. In this phase, there was a greater microbial diversity (Shannon index) and higher microorganism richness (Chao 1 index), both for the Domain Bacteria, and for the Domain Archaea. (c) 2018 Elsevier B.V. All rights reserved. (AU)