Electrokinetic dewatering of Turkish glass sand plant tailings

Bayat, Oktay; Kiliç, Özen; Bayat, Belgin; Anil, Mesut; Akarsu, H.; Poole, Colin F.

doi:10.1016/j.watres.2005.10.021

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…These metal ions react with hydroxyl ions released at the cathode, leading to the formation of metal hydroxides which favor flocks constitution. The hydrogen gas evolved at the cathode can help to remove these flocks by flotation . Although the mechanism of electrocoagulation is similar to that of chemical coagulation, the cationic species responsible of the neutralization of the colloids charge, and the coagulated flocks differ in each of these processes: during electrocoagulation, the coagulants (iron or aluminum ions) are delivered in situ by anode dissolution, this is not the case of the chemical coagulation where these ions are produced by dissolution of iron or aluminum salts, which is also accompanied by the liberation of counter ions .…”

Section: Resultsmentioning

confidence: 99%

“…The hydrogen gas evolved at the cathode can help to remove these flocks by flotation. [17][18][19][20][21] Although the mechanism of electrocoagulation is similar to that of chemical coagulation, the cationic species responsible of the neutralization of the colloids charge, and the coagulated flocks differ in each of these processes: during electrocoagulation, the coagulants (iron or aluminum ions) are delivered in situ by anode dissolution, this is not the case of the chemical coagulation where these ions are produced by dissolution of iron or aluminum salts, which is also accompanied by the liberation of counter ions. 22,23 Compared to chemical coagulation, electrocoagulation provides a simple, reliable and cost-effective method for the treatment of wastewater without any need for additional chemicals, and thus prevents secondary pollution.…”

Section: Results and Discussion Electrocoagulationmentioning

confidence: 99%

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Removal of chlorophyll and tannins from Anthocleista schweinfurthii Gilg leaves by electrocoagulation using iron electrodes: optimization using response surface methodology

Tsopjio

Tchamango

Momeni

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND An electrocoagulation process using iron electrodes was applied for chlorophyll and tannins removal from ethanol extract of aerial parts of Anthocleista schweinfurthii Gilg. A second‐order regression using Central Composite Design (CCD) was used to investigate the main effects of four independent variables, namely supporting electrolyte concentration (in g L−1), ethanol percentage (%), current intensity (in amps) and electrolysis time (in minutes) and their interactions. The chlorophyll removal (CR), total tannins content (TTC) and total phenols content (TPC) were analyzed using response surface methodology (RSM) and CCD. Crude and optimized extracts were characterized by UV‐visible spectrometry and Fourier‐transform infrared spectroscopy. RESULTS The RSM model obtained from the present study (R2 > 0.95) showed a good fit which suggests a good correlation between the predicted values and experimental results of CR and tannins removal. Under optimized conditions (supporting electrolyte concentration 2.4 g L−1; ethanol percentage 67%; current intensity 0.4 A and electrolysis time 75 min), CR of 98.23% and TTC of 58.83% were achieved while remaining 91.21% of TPC. CONCLUSION Ethanol percentage, current intensity and electrolysis time influences positively CR, TTC and TPC. According to the results, electrocoagulation is an appropriate technique indicated for extracting secondary metabolites while reducing the risks associated with the use of organic solvents. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussion Electrocoagulationmentioning

confidence: 99%

Removal of chlorophyll and tannins from Anthocleista schweinfurthii Gilg leaves by electrocoagulation using iron electrodes: optimization using response surface methodology

Tsopjio

Tchamango

Momeni

et al. 2020

J of Chemical Tech & Biotech

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“…Additionally, precipitation of Fe(OH) 3 or Al(OH) 3 solids results in a decline in solution pH values. In EC, this pH decline is counterbalanced by the cathode reactions of hydrogen evolution and oxygen reduction that remove protons from solution (Mickley 2004;Holt et al 2005;Lin et al 2005;Bayat et al 2006) EC has been applied to treat water containing organic contaminants (Laridi et al 2005), dyes (Kim et al 2002;Can et al 2003), metals (Bissen & Frimmel 2003;Adhoum et al 2004;Gao et al 2005;Parga et al 2005), and suspended solids. Recently, several studies have focused on the removal of colloidal silica via EC (Den & Huang 2006;Kin et al 2006;Lai & Lin 2006) and on the removal of hardness ions (Kannan et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Treatment of cooling tower blowdown water containing silica, calcium and magnesium by electrocoagulation

Liao

Schulz

et al. 2009

Water Science and Technology

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This research investigated the effectiveness of electrocoagulation using iron and aluminium electrodes for treating cooling tower blowdown (CTB) waters containing dissolved silica (Si(OH)(4)), Ca(2 + ) and Mg(2 + ). The removal of each target species was measured as a function of the coagulant dose in simulated CTB waters with initial pH values of 5, 7, and 9. Experiments were also performed to investigate the effect of antiscaling compounds and coagulation aids on hardness ion removal. Both iron and aluminum electrodes were effective at removing dissolved silica. For coagulant doses < or =3 mM, silica removal was a linear function of the coagulant dose, with 0.4 to 0.5 moles of silica removed per mole of iron or aluminium. Iron electrodes were only 30% as effective at removing Ca(2 + ) and Mg(2 + ) as compared to silica. There was no measurable removal of hardness ions by aluminium electrodes in the absence of organic additives. Phosphonate based antiscaling compounds were uniformly effective at increasing the removal of Ca(2 + ) and Mg(2 + ) by both iron and aluminium electrodes. Cationic and amphoteric polymers used as coagulation aids were also effective at increasing hardness ion removal.

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“…Few studies have investigated treatment of potentially scale-forming species, such as silica, calcium and magnesium, especially at the concentrations present in industrial process waters. Two studies have investigated EC for dissolved silica removal, one as part of a dewatering process (Bayat et al, 2006) and one as a pretreatment for reverse osmosis (Den and Huang, 2008). However, neither of these studies investigated the relationship between coagulant dose and silica removal.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and pilot testing of electrocoagulation for removing scale-forming species from industrial process waters

Schulz

Baygents

Farrell

2009

Int. J. Environ. Sci. Technol.

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This study investigated the performance of electrocoagulation using iron and aluminum electrodes for removing silica, calcium and magnesium from cooling tower blowdown and reverse osmosis reject waters. Experiments were conducted at both the bench and pilot scales to determine the levels of target species removal as a function of the coagulant dose. At the bench scale, aluminum removed the target compounds from both cooling tower blowdown and reverse osmosis reject more efficiently than iron. A 2 mM aluminum dose removed 80 % of the silica and 20 to 40 % of the calcium and magnesium. The same iron dose removed only 60 % of the silica and 10 to 20 % of the calcium and magnesium. When operated with iron electrodes, pilot unit performance was comparable to that of the bench unit, which suggests that such systems can be scaled-up on the basis of coagulant dose. However, when operated with aluminum electrodes the pilot unit underperformed the bench unit due to fouling of the electrode surfaces after a few hours of operation. This result was completely unexpected based on the short-term experiments performed using the bench unit.

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Electrokinetic dewatering of Turkish glass sand plant tailings

Cited by 13 publications

References 14 publications

Removal of chlorophyll and tannins from Anthocleista schweinfurthii Gilg leaves by electrocoagulation using iron electrodes: optimization using response surface methodology

Removal of chlorophyll and tannins from Anthocleista schweinfurthii Gilg leaves by electrocoagulation using iron electrodes: optimization using response surface methodology

Treatment of cooling tower blowdown water containing silica, calcium and magnesium by electrocoagulation

Laboratory and pilot testing of electrocoagulation for removing scale-forming species from industrial process waters

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