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Sustainability 2017, 9(2), 244; doi:10.3390/su9020244

H2O2 Based Oxidation Processes for the Treatment of Real High Strength Aqueous Wastes

1
Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 1, 27100 Pavia, Italy
2
Department of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
3
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, 25123 Brescia, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Marco Ragazzi
Received: 1 December 2016 / Revised: 25 January 2017 / Accepted: 7 February 2017 / Published: 10 February 2017
(This article belongs to the Section Sustainable Use of the Environment and Resources)
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Abstract

This work was aimed at studying the applicability of H2O2-based oxidation processes (namely H2O2/UV, photo-Fenton, and Fenton) for the treatment of six real aqueous wastes. These wastes derived from chemical, pharmaceutical, and detergent production, and were characterised by high COD (chemical oxygen demand) and, in four cases, surfactant concentrations: overall, about 100 tests were conducted. The H2O2/UV and photo-Fenton processes proved to be very effective in COD removal, the efficiency being greater than 70%. The optimal treatment conditions for the H2O2/UV process were: 120 min reaction, H2O2/CODinitial dosage ratio = 1/2; the radiation intensity (up to 2000 W·L−1) revealed to be a crucial factor, especially in the earlier stage of the process (about 40 min): this aspect can be exploited to reduce the costs related to energy consumption. For the photo-Fenton process the following conditions were chosen: Fe2+/H2O2 ratio = 1/30; specific power input = 125 W·L−1; H2O2/CODinitial = 1/2; reaction time = 240 min. Photolytic reactions and the presence of dissolved oxygen revealed to be crucial factors for COD removal. The Fenton process, while showing a moderate efficiency (25% COD removal) in the treatment of high loaded wastewaters, provided excellent results in the treatment of aqueous wastes with high content of surfactants. An average yield removal of 70% for non-ionic surfactants (TAS) and 95% for anionic surfactants (MBAS) was obtained, under the following optimal conditions: Fe2+/H2O2 = 1/4, H2O2/CODinitial ratio = 1, and contact time = 30 min. View Full-Text
Keywords: advanced oxidation processes; Fenton; H2O2/UV; hydroxyl radical; photo-Fenton; surfactants advanced oxidation processes; Fenton; H2O2/UV; hydroxyl radical; photo-Fenton; surfactants
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MDPI and ACS Style

Collivignarelli, M.C.; Pedrazzani, R.; Sorlini, S.; Abbà, A.; Bertanza, G. H2O2 Based Oxidation Processes for the Treatment of Real High Strength Aqueous Wastes. Sustainability 2017, 9, 244.

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