Treatment of textile wastewaters by electrocoagulation using iron and aluminum electrodes

Kobya, Mehmet; Can, Orhan Taner; Bayramoǧlu, Mahmut

doi:10.1016/s0304-3894(03)00102-x

Cited by 704 publications

(468 citation statements)

References 24 publications

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“…These species have been reported to be charged hydroxo cationic complexes and amorphous aluminium hydroxide [11,17,18]. Electrocoagulation with aluminium electrodes was reported to show the best e ciency between pH 6 and 9 [19], which corresponds to the existence zone of amorphous Al(OH) 3 ( Fig.…”

Section: Coagulation Theorymentioning

confidence: 98%

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Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Baudequin

Couallier

Rakib

et al. 2011

Separation and Purification Technology

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Extinguishments of large scale solvent res produce large amounts of water that may contain various uorinated surfactants depending on the type of re ghting foam used. Due to their chemical nature, uorinated parts of uorinated compounds are highly resistant to biochemical and advanced oxidation processes. Therefore the current treatment for the degradation of uorinated surfactant from water used in re extinguishment is high temperature incineration of the water in halogen resistant incinerators. This paper aims to propose a process for purifying re ghting water containing uorinated surfactants.Pilot re ghting waters resulting from heptane re extinguishment with reghting foam containing a uorinated surfactant were produced. Suspended matter was estimated on the basis of turbidity measurement and uorinated not suitable for direct membrane processes because of high fouling, hence electrocoagulation and ltration were required. Electrocoagulation with aluminium electrodes at a charge loading of 600 C L −1 followed by ltration were found su cient to remove turbidity from pilot re ghting waters. Fluorinated surfactant removal was 71 77% and was not signi cantly increased by higher charge loading. Floc separation in bulk solution was achieved by ltration. Reverse osmosis of pretreated pilot re ghting water and concentrated model solutions of pretreated re ghting water were studied and though ux decline was observed, measured retention rates were 99.94 99.97%, with permeate concentrations down to 10 16 µg L −1 of uorinated surfactant at the laboratory scale. The concentrate from reverse osmosis could be recycled in electrocoagulation-ltration. Experimental results indicated that electrocoagulation and ltration followed by reverse osmosis e ciently treated the water from re extinguishment, which enables a further scale-up work.

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Section: Coagulation Theorymentioning

confidence: 98%

“…Aluminium hydroxide species nally precipitate according to complex kinetics to form amorphous Al(OH) 3 [17,18]:…”

Section: Coagulation Theorymentioning

confidence: 99%

Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Baudequin

Couallier

Rakib

et al. 2011

Separation and Purification Technology

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“…Presently, EC technologies are more efficient and more compact. Removal mechanisms of the EC process include coagulation, adsorption, precipitation, and flotation (Kobya et al, 2003). Similarly, the effect of DC electric fields on COD in aerobic mixed sludge processes has been investigated, and optimum operational conditions were determined (Alshawabkeh et al, 2004).…”

Section: Introduction Wmentioning

confidence: 99%

Treatment of Domestic Wastewater by Electrocoagulation in a Cell with Fe–Fe Electrodes

Kurt

Gönüllü

İlhan

et al. 2008

Environmental Engineering Science

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In this study, the potential to treat domestic wastewater (DWW) using an electrocoagulation (EC) process was tested on two different samples, one of which was heavily loaded [380 mg chemical oxygen demand (COD)/L]; the other was weakly loaded [260 mg COD/L]. The samples were supplied from the Istanbul-Yenikapi DWW pretreatment plant. The experimental studies were conducted within an electrolysis cell with Fe-Fe electrodes. In this cell, under optimum operational conditions in the form of electrical power and electrolysis time, pollutant removal efficiency (as COD), suspended solids (SS) and characteristics of formed sludge were tested. At the end of these studies, the optimum operational conditions found for electrical power was 0.6 W for both DWW samples, and electrolysis times were determined as 15 min for heavily loaded DWW (HLDWW) and 8 min for weakly loaded DWW (WLDWW). Energy consumption in optimum electrical charge conditions was 0.4 kWh/m 3 HLDWW and 0.2 kWh/m 3 WLDWW. The removal efficiency of COD and SS were obtained and shown to be over 60 and 70%, respectively. The level of sludge production was 1.5-2% during the optimal reaction time, and sludge volume was decreased 50% using H 2 O 2 .

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“…Referring to the reported results dealing with the electrocoagulation processes using aluminum as a sacrificial electrode, species such as Al(OH) 3 and/or Al(OH) 4 -could be formed in solution (Kobya et al 2003;Picard et al 2000). Based on the analytical data (Table 1) and the FT-IR analyses (Fig.…”

Section: Mineralogical and Chemical Characterization Of The Used Sorbmentioning

confidence: 86%

Adsorption of blue copper on a natural and electrochemically treated bentonite

2014

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Kinetics and equilibrium studies of the adsorption of blue copper on a natural (NC) and electrochemically treated (EMC) bentonite, taken in different experimental conditions, were carried out. Changes of the dye uptake versus operating factors were evaluated using response surface methodology (RSM). The kinetics at 5-50°C and pH \ 10 obeyed the pseudo-first-order equation. Beyond pH 10, the pseudo-second-order equation also was suitable. The kinetics for NC was essentially controlled by external diffusion. However, both internal and external diffusion were the rate-limiting steps of the EMC kinetics. The NC isotherms were well described by the Langmuir model and the maximum uptake was around 21 mg/g. In the case of EMC, the Freundlich equation was rather fitting. Dye adsorption on both sorbents was a nonspontaneous process (2 \ DG T 0 \ 8 kJ/mol). According to the RSM results, pH had a negative impact on the dye adsorption and was the most influential factor in the case of EMC. For NC, the clay dose was rather the most important parameter.

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Treatment of textile wastewaters by electrocoagulation using iron and aluminum electrodes

Cited by 704 publications

References 24 publications

Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Treatment of Domestic Wastewater by Electrocoagulation in a Cell with Fe–Fe Electrodes

Adsorption of blue copper on a natural and electrochemically treated bentonite

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