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Author(s): Maria Francisca Moreira
Rui Boaventura
Enric Brillas
Vitor Vilar
Title: Remediation of a winery wastewater combining aerobic biological oxidation and electrochemical advanced oxidation processes
Issue Date: 2015
Abstract: Apart from a high biodegradable fraction consisting of organic acids, sugars and alcohols, winery wastewaters exhibit a recalcitrant fraction containing high-molecular-weight compounds as polyphenols, tannins and lignins. In this context, a winery wastewater was firstly subjected to a biological oxidation to mineralize the biodegradable fraction and afterwards an electrochemical advanced oxidation process (EAOP) was applied in order to mineralize the refractory molecules or transform them into simpler ones that can be further biodegraded. The biological oxidation led to above 97% removals of dissolved organic carbon (Doc), chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD5), but was inefficient on the degradation of a bioresistant fraction corresponding to 130 mg L-1 of DOC, 380 mg 02 L-1 of COD and 8.2 mg caffeic acid equivalent L-1 of total dissolved polyphenols. Various EAOPs such as anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), UVA photoelectro-Fenton (PEF) and solar PEF (SPEF) were then applied to the recalcitrant effluent fraction using a 2.2 L lab-scale flow plant containing an electrochemical cell equipped with a boron-doped diamond (BDD) anode and a carbon-PTFE air-diffusion cathode and coupled to a photoreactor with compound parabolic collectors (CFCs). The influence of initial Fe2+ concentration and current density on the PEF process was evaluated. The relative oxidative ability of EA0Ps increased in the order AO-H2O2< EF < PEF < SPEF. The SPEF process using an initial Fe2+ concentration of 35 mg L-1, current density of 25 mA cm(-2), pH of 2.8 and 25 degrees C reached removals of 86% on DOC and 68% on COD after 240 min, regarding the biologically treated effluent, along with energy consumptions of 45 kWh (kg DOC)(-1) and 5.1 kWh m(-3). After this coupled treatment, color, odor, COD, BOD5, NH4+, NO3- and SO42- parameters complied with the legislation targets and, in addition, a total dissolved polyphenols content of 0.35 mg caffeic acid equivalent L-1 was found. Respirometry tests revealed low biodegradability enhancement along the SPEF process.
Subject: Tecnologia ambiental, Engenharia do ambiente
Environmental technology, Environmental engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
info:eu-repo/grantAgreement/Universidade do Porto/Investigação Científica na Pré-Graduação/PP-IJUP2011-46/Aproveitamento da Energia Solar para o Tratamento de Efluentes Vinícolas /SOLARVIN
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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