Application of electro-Fenton oxidation for the detoxification of olive mill wastewater phenolic compounds

Khoufi, Sonia; Aouissaoui, Hedi; Penninckx, Michel; Sayadi, Sami

doi:10.2166/wst.2004.0231

Cited by 35 publications

(21 citation statements)

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“…Interestingly, COD appears to increase or remain unchanged during the early stages of reaction and this is more pronounced at 15 mA cm -2 . This phenomenon may be due to oxidative polymerization of certain OMW constituents like phenols and tannins, which would result in COD increase in the effluent as has also been observed by other researchers [7,13], as well as dissolution of unfiltered solids upon electrochemical oxidation, thus releasing organic matter in the liquid phase as has also been reported by Kotta et al [24]. Nonetheless, such dissolution is not expected to contribute substantially to the increased concentrations since most of the solids had already been removed from the effluent by means of filtration.…”

Section: Effect Of Operating Conditions On Cod and Toc Removalsupporting

confidence: 60%

“…The industrial use of dimensionally stable anodes (DSA) for wastewater treatment has led to technological solutions, thus reducing operational and investment costs [3]. Such DSA-type materials have been used for the oxidation of model aqueous solutions containing phenolic compounds typically found in OMW with emphasis on titanium based on different oxides such as IrO 2 , RuO 2 , SnO 2 [4][5][6][7][8][9]. As has already been emphasized [1], only few of these investigations have dealt with the DSA oxidation of actual OMW.…”

Section: Introductionmentioning

confidence: 99%

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DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode

2009

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The electrochemical oxidation of olive mill wastewater (OMW) over a Ti/RuO 2 anode was studied by means of cyclic voltammetry and bulk electrolysis and compared with previous results over a Ti/IrO 2 anode. Experiments were conducted at 300-1,220 mg L -1 initial chemical oxygen demand (COD) concentrations, 0.05-1.35 V versus SHE and 1.39-1.48 V versus SHE potential windows, 15-50 mA cm -2 current densities, 0-20 mM NaCl, Na 2 SO 4 , or FeCl 3 concentrations, 80°C temperature, and acidic conditions. Partial and total oxidation reactions occur with the overall rate being near first-order kinetics with respect to COD. Oxidation at 28 Ah L -1 and 50 mA cm -2 leads to quite high color and phenols removal (86 and 84%, respectively), elimination of ecotoxicity, and a satisfactory COD and total organic carbon reduction (52 and 38%, respectively). Similar performance can be achieved at the same charge (28 Ah L -1 ) using lower current densities (15 mA cm -2 ) but in the presence of various salts. For example, COD removal is less than 7% at 28 Ah L -1 in a salt-free sample, while addition of 20 mM NaCl results in 54% COD reduction. Decolorization of OMW using Ti/RuO 2 anode seems to be independent of the presence of salts in contrast with Ti/IrO 2 where addition of NaCl has a beneficial effect on decolorization.

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Section: Effect Of Operating Conditions On Cod and Toc Removalsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode

2009

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“…The presence of inhibitory compounds, such as phenols, limits the COD removal as observed in the residual COD of the present study ( Figure 3B). These phenolic compounds are known to show antimicrobial properties (Acar et al, 1992;Khoufi et al, 2004;Chen et al, 2010;Mohamed et al, 2010).…”

Section: Olive Oil Washing Water Feedingmentioning

confidence: 99%

Suitability of olive oil washing water as an electron donor in a feed batch operating bio-electrochemical system

et al. 2017

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SUMMARY:Olive oil washing water derived from the two-phase manufacturing process was assessed as an electron donor in a bio-electrochemical system (BES) operating at 35 ºC. Start-up was carried out by using acetate as a substrate for the BES, reaching a potential of around +680 mV. After day 54, BES was fed with olive oil washing water. The degradation of olive oil washing water in the BES generated a maximum voltage potential of around +520 mV and a Chemical Oxygen Demand (COD) removal efficiency of 41%. However, subsequent loads produced a decrease in the COD removal, while current and power density diminished greatly. The deterioration of these parameters could be a consequence of the accumulation of recalcitrant or inhibitory compounds, such as phenols. These results demonstrated that the use of olive oil washing water as an electron donor in a BES is feasible, although it has to be further investigated in order to make it more suitable for a real application. KEYWORDS: Bio-electrochemical system; COD removal; Electricity generation; Electron donor; Olive oil washing watersRESUMEN: Idoneidad del agua de lavado de aceites de oliva como donador de electrones en un sistema alimentado por lotes bioelectroquímico. El agua de lavado del aceite de oliva procedente del proceso de elaboración en dos fases fue utilizada como donador de electrones en un Sistema Bioelectroquímico (BES) operado a 35ºC. Se realizó una etapa de arranque del sistema mediante alimentación con acetato, alcanzando un potencial de referencia de +680 mV. Tras 54 días, el sistema se alimentó con agua de lavado de aceite, generando un potencial máximo de +520 mV y una eliminación de materia del 41%, en demanda química de oxígeno. Sin embargo, cargas subsecuentes conllevaron una bajada en la eliminación de materia, mientras que la densidad de corriente y de potencia disminuyeron ostensiblemente. El empeoramiento de estos parámetros puede deberse a la acumulación de compuestos recalcitrantes o inhibidores, como fenoles. Por tanto, el uso del agua de lavado de aceite de oliva en un BES es factible, aunque es necesario llevar a cabo nuevas investigaciones que hagan más atractiva su aplicación a escala real. Citation/Cómo citar este artículo: Fermoso FG, Fernández-Rodríguez MJ, Jiménez-Rodríguez A, Serrano A, Borja R. 2017. Suitability of olive oil washing water as an electron donor in a feed batch operating bio-electrochemical system. Grasas Aceites 68 (2), e198. http://dx

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“…Other solutions, such as advanced oxidation processes and/or physico-chemical processes, have also been developed. Some examples include Fenton treatment (Nasr et al, 2004;Vlyssides et al, 2004), ozonation (Ahmed et al, 2005), ultra-filtration and photoperoxidation techniques (Drouiche et al, 2004), electrochemical oxidation (Panizza and Cerisola, 2006), electrocoagulation (Adhoum and Monser, 2004) and electro-Fenton oxidation (Khoufi et al, 2004). To our knowledge, there are only a few studies which involve wet air oxidation technologies (catalytic (CWAO) or non-catalytic (WAO)) to treat OMW (Rivas et al, 2001;Minh et al, 2006), although they seem to be very good options, because the concentrations of OMW are too high for biological treatment and too diluted for incineration.…”

Section: Introductionmentioning

confidence: 99%

Catalytic wet air oxidation of olive mill wastewater

2007

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The objective of this work was to study the suitability of catalytic wet air oxidation (CWAO) for the treatment of olive mill wastewater (OMW). Accordingly, experiments were performed in a high pressure reactor at 100ºC and 200ºC under an oxygen partial pressure of 6.9 bar, using carbon supported platinum (1wt.% Pt) and iridium (5 wt.% Ir) catalysts prepared by incipient wetness impregnation. Both catalytic systems showed a very high activity in the total organic carbon (TOC) removal of the effluent, an increase in TOC removal relatively to non-CWAO being observed. At 200ºC, complete TOC and colour removal was obtained with the Pt/C catalyst after 8 h of reaction. At 100ºC, the results indicate that a certain fraction of compounds in the effluent (low molecular weight recalcitrant carboxylic acids) could not be removed even after prolonged reaction time. A kinetic model was developed taking into account catalytic and noncatalytic reaction, formation of refractory compounds and catalyst deactivation. A very good agreement between the model results and the CWAO experimental data at 200ºC was found. The results obtained in this work indicate that Pt/C is a promising catalyst for the CWAO of OMW.

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Application of electro-Fenton oxidation for the detoxification of olive mill wastewater phenolic compounds

Cited by 35 publications

References 0 publications

DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode

DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode

Suitability of olive oil washing water as an electron donor in a feed batch operating bio-electrochemical system

Catalytic wet air oxidation of olive mill wastewater

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