Does the photo-Fenton reaction work for microalgae control? A case study with Desmodesmus subspicatus.

摘要: Increased concentrations of nutrients in water bodies caused by effluent discharge, fertilizers and other inputs can lead to artificial eutrophication, increasing the primary productivity, bringing well-known serious consequences environment (such as excessive macrophyte microalgae growth). Most strategies for phytoplankton control aquatic ecosystems result metal accumulation or toxic by-product formation after chlorination. Concerning this matter, photo-Fenton process (usually applied wastewater treatment degradation a variety contaminants) has been studied disinfection. However, its application inactivation not reported until now. Therefore, work aimed evaluate effectiveness inactivating microalgae, using Desmodesmus subspicatus model. Photo-Fenton experiments were carried out at lab scale, 105 cells per mL with 20 mg L-1 H2O2 5 Fe2+ (complexed oxalic acid). The cell concentration Growth Inhibition Test (GIT) used efficiency Scanning Electron Microscopy (SEM) analyze any alterations morphology. After performing reaction, individual contribution reactants radiation was investigated. significantly reduced during but SEM images indicated possible morphology GIT showed loss viability 30 minutes exposure. Effects on growth also observed when exposed only hydrogen peroxide.