Treatment of laundry wastewater by solar photo-Fenton process at pilot plant scale
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RESEARCH ARTICLE
Treatment of laundry wastewater by solar photo-Fenton process at pilot plant scale Ana Belén Esteban García 1,2 & Kacper Szymański 3 & Sylwia Mozia 3
&
José Antonio Sánchez Pérez 1,2
Received: 12 June 2020 / Accepted: 5 October 2020 # The Author(s) 2020
Abstract Laundry sector consumes a huge amount of water which is usually discharged as wastewater instead of being reused. The application of biological treatment of laundry wastewater coupled with post-treatment utilizing advanced oxidation processes creates a possibility to recycle water to the washing process. However, the investigations on such systems are very limited. In the present work, a novel approach of post-treatment of laundry wastewater utilizing solar photo-Fenton operated at a pilot scale in a compound parabolic collector (CPC) photoreactor is proposed. Sodium dodecyl sulfate (SDS) was used as a representative of surfactants applied in the laundry system. The effect of feed matrix was investigated using distilled water as a reference matrix and synthetic wastewater simulating the composition of biologically pre-treated laundry wastewater. Different concentrations of H2O2 (50–400 mg/L) and ferrous iron (2.75–10 mg/L) were assayed. For comparison purpose, experiments at neutral pH using ethylenediamine-N,N′-disuccinic acid (EDDS) as an iron complexing agent were carried out. A high SDS removal efficiency was obtained under both neutral and acidic pH, reaching 89% and 96%, respectively, in just 8 min. However, the remaining organic load originating from EDDS needs application of further post-treatment steps. Therefore, the solar photo-Fenton operated under acidic pH was found to be a more promising approach of post-treatment of laundry wastewater aimed at its reuse. Keywords Advanced oxidation process . Surfactants . Sodium dodecyl sulphate . Mineralization . Compound parabolic collector
List of symbols and abbreviations AOPs Advanced oxidation processes CPC Compound parabolic collector DOC Dissolved organic carbon DW Distilled water EDDS Ethylenediamine-N,N’-disuccinic acid F Fenton HPLC-DAD High-performance liquid chromatography with diode array detector
IC LOQ PF SDS SW TOC UV Vi VT
Inorganic carbon Limit of quantification Photo-Fenton Sodium dodecyl sulphate Synthetic wastewater Total organic carbon Ultraviolet Illuminated volume Total volume
Responsible editor: Vítor Pais Vilar * Sylwia Mozia [email protected] 1
Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, 04120 Almería, Spain
2
Chemical Engineering Department, University of Almería, 04120 Almería, Spain
3
Faculty of Chemical Technology and Engineering, Department of Inorganic Chemical Technology and Environment Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland
Introduction Laundry wastewater is generated during the washing of clothes at household and industrial scale. Modern laundries use 10 L of water per 1 kg of dry clothing, while the water consumption in the old ty
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