Abstract
The fate of emerging organic micropollutants (EOMs) in wastewater treatment plants (WWTPs) is still not fully determined, and further studies are still needed to assess whether the existing treatment units can be further exploited (e.g., by modifying the operating parameters) or new and different techniques have to be implemented for their removal. The present study investigates the fate of a class of EOMs, i.e., the endocrine disrupting chemicals (EDCs), in batch-activated sludge tests under mixed and aerated conditions, as those usually adopted in full-scale WWTPs. Among the EDCs, the research focused on: bisphenol A, 17α-ethinylestradiol (EE2), and two natural EDCs—estrone (E1) and 17β-estradiol (E2). By applying different operating conditions to the tests, it was possible to distinguish between contributions due to volatilization, adsorption onto the sludge flocs, and biodegradation to the overall removal of each EDC. It was found that all the investigated EDCs were removed mainly by adsorption and biodegradation. Starting from a relatively high concentration (1000 ng/L), the removal process was capable of reducing the influent load to very low values within the duration of the test (i.e., 48 h). Kinetics of the removal process were found to be best fitted by the pseudo-second-order model for all the investigated EDCs; the values of the relative constants were always found to be equal to about 0.0023 1/h. Furthermore, the values of the coefficients K D and K OM were determined and found to be comparable with the data reported by the specialized literature.
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Chiavola, A., Tedesco, P. & Boni, M.R. Fate of Some Endocrine Disruptors in Batch Experiments Using Activated and Inactivated Sludge. Water Air Soil Pollut 227, 424 (2016). https://doi.org/10.1007/s11270-016-3126-2
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DOI: https://doi.org/10.1007/s11270-016-3126-2