Combined process for removal of tetracycline antibiotic - Coupling pre-treatment with a nickel-modified graphite felt electrode and a biological treatment.

Abstract : Biodegradability improvement of tetracycline-contg. solns. after an electrochem. pre-treatment was examd. Cyclic voltammetry with a nickel electrode revealed a significant electrochem. activity of tetracycline, in both oxidn. and redn. Electrochem. treatment was therefore performed in a home-made flow cell using a nickel-modified graphite felt electrode as the working electrode. Optimal conditions, namely 100 mg l-1 initial tetracycline, above 0.45 V potential, and between 1 and 6 mL min-1 flow rate, led to a more than 99% conversion yield of tetracycline in oxidn. in alk. conditions, after only a single pass through the percolation cell. However, total org. carbon (TOC) analyses revealed a low mineralization level, i.e., always below 31%, underscoring the importance of a combined electrochem. and biol. treatment. This was confirmed by the favorable trends of the COD/TOC ratio, decreasing from 2.7 to 1.9, and the av. oxidn. state, increasing from 0.044 to 1.15, before and after oxidn. pretreatment at 0.7 V and 3 mL min-1 flow rate. Electrolyzed solns. appeared biodegradable, since BOD5/COD increased from 0 to 0.46 for untreated and pretreated TC at 0.7 V/SCE. Biol. treatment showed only biosorption for non-pretreated tetracycline, while after 11.5 days of culture, the mineralization of solns. electrolyzed in oxidn. was 54%, leading to a 69% overall TOC decrease during the combined process.
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Daouia Belkheiri, Florence Fourcade, Florence Geneste, Didier Floner, Hamid Aït-Amar, et al.. Combined process for removal of tetracycline antibiotic - Coupling pre-treatment with a nickel-modified graphite felt electrode and a biological treatment.. International Biodeterioration and Biodegradation, Elsevier, 2015, 103, pp.147-153. ⟨10.1016/j.ibiod.2015.02.032⟩. ⟨hal-01153056⟩

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