Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7484152 | Journal of Environmental Management | 2013 | 4 Pages |
Abstract
Linear alkylbenzene sulfonate (LAS) is an anionic surfactant used in cleaning products, which is usually found in wastewaters. Despite the greater LAS removal rate related to a lower concentrations of volatile fatty acids (VFA), the influence of different ranges of VFA on LAS degradation is not known. LAS degradation was evaluated in upflow anaerobic sludge blanket (UASB) and expanded granular sludge bed (EGSB) reactors at different ranges of VFA concentrations. The reactors were fed with a synthetic wastewater containing LAS (14Â mg/L). A greater LAS removal rate (40-80%) was related to the lower and narrower range of acetic acid concentration (1-22Â mg/L) in the EGSB reactor. In the UASB reactor, the acetic acid concentrations presented a wider range (2-45Â mg/L), and some low LAS removal rates (around 20-25%) were observed even at low acetic acid concentrations (<10Â mg/L). The high recirculation rate in the EGSB reactor improved substrate-biomass contact, which resulted in a narrower range of VFA and greater LAS removal rate.
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Authors
Dagoberto Y. Okada, Tiago P. Delforno, Andressa S. Esteves, Juliana Polizel, Julia S. Hirasawa, Iolanda C.S. Duarte, Maria B.A. Varesche,