Authors: Lust, Mariko; Stensel, H. David

Source: Proceedings of the Water Environment Federation, WEFTEC 2011: Session 71 through Session 80 , pp. 5020-5040(21)

Publisher: Water Environment Federation

Abstract:

Lab-scale sequencing batch reactors (SBRs) were operated to simulate aerobic only, anoxic/aerobic and anaerobic/aerobic activated sludge selector designs at 5 and 10-day aerobic solids retention times (SRTs). At the 5-day aerobic SRT, higher 17α-ethinylestradiol (EE2) degradation kinetics were obtained with an anaerobic/aerobic process versus aerobic only and anoxic/aerobic with pseudo first-order biodegradation (k_b) coefficients of 19, 6, and 3 L/gVSS·d for the anaerobic/aerobic, aerobic only and anoxic/aerobic mixed liquors, respectively. At the 10-day aerobic SRT, EE2 k_b values for the aerobic only and anoxic/aerobic mixed liquors increased to 16 and 22 L/gVSS·d, respectively, and were close to the anaerobic/aerobic k_b value of 19 L/gVSS·d. Improvements in estrone (E1) degradation were observed swith an anaerobic/aerobic process and at a longer SRT. E1 was reduced to 17β-estradiol (E2) during the anaerobic period while E2 was oxidized to E1 during the anoxic period. No EE2 degradation occurred during the anoxic or anaerobic periods.

Keywords: Estrogens; biological nutrient removal; anaerobic; anoxic; activated sludge

Document Type: Research article

DOI: http://dx.doi.org/10.2175/193864711802765273

Publication date: 2011-01-01

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