GRESSLER, V.

MATTHIENSEN, A.

MICHELON, W.

SOARES, H. M.

VIANCELLI, A.

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 -- 68 --  MICROALGAE-BASED PROCESS FOR THE DEPLETION OF TETRACYCLINES IN SWINE WASTEWATER  William Michelon*, Alexandre Matthiensen, Vanessa Gressler, Aline Viancelli, Hugo Moreira Soares * Universidade Federal de Santa Catarina - Brazil Embrapa Suínos e Aves - Brazil  eng.williammichelon@gmail.com  Abstract: Antibiotics (ATB) have been used to treat animal diseases and, in some countries, to promote animal growth in livestock industry. The use of ATB in food-producing brings up an environmental trouble once it is known that a significant amount of the ATB is excreted and reach the environment. This study evaluated the degradation efficiency of four tetracyclines (TCs) by a consortium of indigenous microalgae (mainly Chlorella spp.) cultivated in swine wastewater. Reactors containing chlorine-free water (64% v v-1), effluents from an UASB reactor (6% v v-1), microalgae consortium (30% v v-1) and 1 mg L-1 of ATB were exposed to white light (21.6 W m-2) in a 12h:12h light:dark cycle, temperature of 23 °C and continuous agitation for 11 days. TCs were extracted from culture samples using pre-conditioned Oasis HLB SPE cartridge and after elution they were analyzed by ESI(+)-LC-MS/MS. The results of biomass growth showed no significant difference among the experiments and the control (p>0.05), showing that concentration of the TCs did not inhibit the growth rate. ATB depletion was around 98% for tetracycline, 91% for doxycycline, 89% for oxytetracycline and 87% for chlortetracycline by the phycoremediation process (considering 0% at time zero) after 11 days of treatment. This work concludes that the microalgae-based process is an efficient technology for tetracycline degradation in swine wastewater.  Keywords: Veterinary antibiotics, phycoremediation, biomass.      

Microalgae-based process for the depletion of tetracyclines in swine wastewater.

http://www.alice.cnptia.embrapa.br/bitstream/doc/1142886/1/final9728.pdf

Microalgae-based process for the depletion of tetracyclines in swine wastewater.

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