This study evaluates the technical, economical, and environmental impact of sodium persulfate (Na S O ) as an enhancing 2 2 8 agent in a photo-Fenton process within a solar-pond type reactor (SPR). Photo-Fenton (PF) and photo-Fenton intensified with the addition of persulfate (PFPS) processes decolorize 97% the azo dye direct blue 71 (DB71) and allow producing a highly biodegradable effluent. Intensification with persulfate allowed reducing treatment time in 33% (from 120 to 80 min) and the consumption of chemical auxiliaries needed for pH adjustment. Energy, reagents, and chemical auxiliaries are still and environmental hotspot for PF and PFPS; however, it is worth mentioning that their environmental footprint is lower than that observed for compound parabolic concentrator (CPC)-type reactors. A life-cycle assessment (LCA) confirms that H O , NaOH, and energy consumption are the variables with the highest impact from an environmental standpoint. The use 2 2 of persulfate reduced the relative impact in 1.2 to 12% in 12 of the 18 environmental categories studied using the ReCiPe method. The PFPS process emits 1.23 kg CO (CO -Eqv/m treated water). On the other hand, the PF process emits 1.28 kg 2 2 CO (CO -Eqv/m treated water). Process intensification,
Environmental Science and Pollution Research – Springer Journals
Published: May 31, 2018
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