4.7 Article

Microcontaminant removal in solar pilot scale photoreactors with commercial iron nanoparticles obtained from olive mill wastewater

Journal

CATALYSIS TODAY
Volume 413, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.cattod.2022.11.029

Keywords

Olive mill waste; Pilot plant; Solar energy; Wastewater treatment; Zero valent iron

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This study investigated the removal efficiency of microcontaminants (MCs) from natural water using iron nanoparticles derived from olive mill wastewater (ZVI-OMW) combined with oxidants under solar radiation. The effects of corrosion, adsorption, solar photolysis, and different concentrations of H2O2, S2O82-, carbonates, and ZVI-OMW were examined. Lab tests showed that the optimal treatment option was the combination of 1 mM S2O82- with NW and 1 mM ZVI-OMW. Pilot-scale experiments were conducted in raceway pond reactors (RPR) and a compound parabolic collector (CPC) photo-reactor. The results showed that the removal time of microcontaminants increased with liquid depth in the RPR, while the mass removal rate increased with depth in the CPC, but higher ZVI-OMW concentration hindered the process efficiency in both reactors.
This study assessed removal of microcontaminants (MCs) from natural water (NW) using iron nanoparticles extracted from olive mill wastewater (ZVI-OMW), an agro-industrial waste product, combined with oxidants under natural solar radiation. The specific effects of corrosion, adsorption and solar photolysis, and of H2O2, S2O82-, carbonates and ZVI-OMW concentrations on treatment efficiency were also evaluated. Lab tests demonstrated that the combination of 1 mM S2O82- with NW and 1 mM ZVI-OMW was the best treatment option. Process performance was evaluated under these operating conditions in pilot-scale raceway pond reactors (RPR) at three liquid depths (5, 10 and 15 cm), as well as in a compound parabolic collector (CPC) photo-reactor. The time required to achieve 50% removal of a MC mixture (atrazine, carbendazim, imidacloprid and thiamethoxam, at 100 mu g/L each) increased with liquid depth, resulting in 164, 224, and 250 min for 5, 10, and 15 cm, respectively. MC mass removal rate increased with liquid depth, achieving 50% MC removal in the CPC (1 mM ZVI-OMW) in 120 min. Doubling ZVI-OMW concentration was detrimental to process efficiency in both photoreactors due to light obstruction. Partial sedimentation of ZVI-OMW in the RPR suggests that the use of this type of reactor for heterogeneous photocatalysis could present problems for large-size operation.

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