Assessment of toxicity and biodegradability on activated sludge of priority and emerging pollutants

Abstract

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Thiamethoxam removal by Fenton and biological oxidation

“…The toxicity of the Fenton effluent was assessed through the Microtox ® assay, which was used previously with various pesticides . Figure also shows the IC 50 values (TU) of the effluents from Fenton‐like oxidation at different H 2 O 2 doses.…”

“…The toxicity of the Fenton effluent was assessed through the Microtox ® assay, which was used previously with various pesticides. 36 Figure 3 also shows the IC 50 values (TU) of the effluents from Fenton-like oxidation at different H 2 O 2 doses. The assay revealed that a 25% H 2 O 2 dose dramatically decreased the luminescence of the effluent from Fenton oxidation.…”

“…Ecotoxic effects were examined through the decrease in light emission by the bacterium as a result of exposure to the samples after incubation at 15 °C for 15 min. Ecotoxicity was assessed in terms of EC 50 (PTMX) or IC 50 (CTMX and effluents from Fenton‐like oxidation), defined as the effective concentration or dilution ratio decreasing the bioluminescence by 50% …”

Dietary quercetin abrogates hepatorenal oxidative damage associated with dichloromethane exposure in rats

“…MDA and 4-hydroxynonenal are biomarkers of lipid peroxidation (Demir et al, 2011), attacking distant targets and covalently binding with biomolecules (Levent et al, 2006). Reduction in MDA level in rats co-treated with quercetin indicates its ability to protect against DCM mediated lipid peroxidation, due to its antioxidant activity (Xiao et al, 2018). DCM treatment also resulted in decreased hepatorenal antioxidant enzymes (SOD, CAT, GPx), essential for superoxide radical biotransformation to H 2 O 2, thus preventing its damaging effects (Klaunig et al, 2011) on one hand and cytotoxicity by transforming H 2 O 2 to water and oxygen (Kohen & Nyska, 2002;Adedara et al, 2012) on the other hand.…”

“…Acute and chronic exposure to DCM reportedly poses great threat to humans and ecosystems due to its toxicity, persistence, and bioaccumulation in the food chain (Tobajas et al, 2016). DCM, due to its lipophilicity is easily absorbed and metabolized in humans and animals resulting in multiple organ damage (Schlosser et al, 2015).…”