Combined photo-Fenton and biological oxidation for pesticide degradation: Effect of photo-treated intermediates on biodegradation kinetics

Treatment of synthetic soil washing solutions containing phenanthrene and cyclodextrin by electro-oxidation. Influence of anode materials on toxicity removal and biodegradability enhancement

“…However, the most common one is the Vibrio fischeri bioluminescence inhibition assay [59]. In the aim to get data comparable to other research papers, toxicity assays of the present study were performed by using Microtox ® standard method (ISO 11348-3) with marine bacteria Vibrio fischeri from LUMIStock LCK-487 (Hach Lange).…”

Confirming Pseudomonas putida as a reliable bioassay for demonstrating biocompatibility enhancement by solar photo-oxidative processes of a biorecalcitrant effluent

“…After 96 h of culture, the biodegradation efficiency (E f ) of photo-reaction intermediates was calculated as the ratio between the actual organic carbon uptake and the maximum DOC consumption [12], according to the following equation:…”

“…The use of Pseudomonas putida for this purpose seems interesting as it is commonly a part of the consortium of micro-organisms present in activated sludge; these assays might combine the improved reproducibility of using a more simple system than activated sludge, with a behaviour that is not expected to differ substantially to that of the biological reactors [12]. Furthermore, biodegradability assay using P. putida is faster (some few days) than the widely used Zahn-Wellens test for which 28 days are needed.…”

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

“…Advanced oxidation processes are based on the production in situ of free oxidizing radical species mainly hydroxyl radicals (HO • ). These radicals can be generated by chemical (Fenton (H 2 O 2 /Fe 2+ ) [11] [12], ozonation at alkaline medium [13], peroxonation (O 3 /H 2 O 2 ) [14], photochemical UV/TiO 2 [15] [16] UV/H 2 O 2 [17] [18], UV/O 3 [19], photo-Fenton UV/H 2 O 2 /Fe 2+ [20] [21], and electrochemical (anodic oxidation, electro-Fenton) [22] [23]. Hydroxyl radicals are powerful oxidants (E˚ = 2.80 V/NHE), which react immediately and non-selectively with organic pollutants in water which leads in most cases to a complete mineralization these compounds or to transform them into readily biodegradable compounds.…”