Details

Autor(en) / Beteiligte

• Moreira, Irina S.
• Amorim, Catarina L.
• Ribeiro, Ana R.
• Mesquita, Raquel B.R.
• Rangel, António O.S.S.
• van Loosdrecht, Mark C.M.
• Tiritan, Maria E.
• Castro, Paula M.L.

Titel

Removal of fluoxetine and its effects in the performance of an aerobic granular sludge sequential batch reactor

Ist Teil von

• Journal of hazardous materials, 2015-04, Vol.287, p.93-101

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2015

Quelle

ScienceDirect

Beschreibungen/Notizen

• •Enantioselective removal of fluoxetine by aerobic granular sludge was evaluated.•Sorption of fluoxetine to aerobic granules occurred.•Bacterial community gradually changed during operation of sequential batch reactor.•Main biological processes occurring within the granules were preserved.•Overall performance of the reactor was recovered after initial fluoxetine shock loads. Fluoxetine (FLX) is a chiral fluorinated pharmaceutical mainly indicated for treatment of depression and is one of the most distributed drugs. There is a clear evidence of environmental contamination with this drug. Aerobic granular sludge sequencing batch reactors constitute a promising technology for wastewater treatment; however the removal of carbon and nutrients can be affected by micropollutants. In this study, the fate and effect of FLX on reactor performance and on microbial population were investigated. FLX adsorption/desorption to the aerobic granules was observed. FLX shock loads (≤4μM) did not show a significant effect on the COD removal. Ammonium removal efficiency decreased in the beginning of first shock load, but after 20 days, ammonia oxidizing bacteria became adapted. The nitrite concentration in the effluent was practically null indicating that nitrite oxidizing bacteria was not inhibited, whereas, nitrate was accumulated in the effluent, indicating that denitrification was affected. Phosphate removal was affected at the beginning showing a gradual adaptation, and the effluent concentration was <0.04mM after 70 days. A shift in microbial community occurred probably due to FLX exposure, which induced adaptation/restructuration of the microbial population. This contributed to the robustness of the reactor, which was able to adapt to the FLX load.