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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 1, 2014, pp. 9-20
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Bioline Code: st14002
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 1, 2014, pp. 9-20
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Effect of the injection of pure oxygen into a membrane bioreactor on the elimination of bisphenol A
Dorival-García, N.; Zafra-Gómez, A.; Oliver-Rodríguez, B.; Navalón, A.; González-López, J. & Vílchez, J. L.
Abstract
The effect of the injection of pure oxygen
instead of air in a membrane bioreactor for the elimination
of bisphenol A is investigated. A dynamic experiment was
developed in a pilot plant where the aerobic reactor was
continuously spiked with 1 mg L-1 of bisphenol A. Air
was injected for 10 days and then pure oxygen was injected
for another 10 days. The bisphenol A concentration was
determined in aqueous phases and activated sludge using
simple and sensitive analytical methods based on different
extraction procedures and liquid chromatography tandem
mass spectrometry analysis. Enzymatic activity was also
determined and toxicity tests were performed to discard
that the spiked bisphenol A concentration could negatively
affect the microorganisms in the bioreactor and, thus, the
membrane bioreactor performance. The effluent bisphenol
A concentration increased up to 0.26 mg L-1 after 4 days
in the air injection treatment, and up to 0.48 mg L-1 after
only 12 h in the oxygen injection treatment. In both cases,
this was followed by a decrease in concentration despite
the continuous spiking of bisphenol A into the bioreactor.
In presence of pure oxygen, bisphenol A concentration
reached background levels (below the limit of quantification)
after 5 days. In contrast, when using air a total of
10 days were required to reach background levels. The
injection of pure oxygen instead of air is an important
innovation in wastewater treatment, allowing permanent
elimination of organic contaminants, avoiding their return
to the environment and ensuring the safety of water.
Keywords
Bisphenol A; Liquid chromatography tandem mass spectrometry; Membrane bioreactor; Sewage sludge; Wastewater
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