Effect of controlled and uncontrolled pH on tannery wastewater treatment by the electrocoagulation process

Bingül, Züleyha; İrdemez, Şahset; Demircioğlu, Nuhi

doi:10.1080/03067319.2021.1925261

Cited by 11 publications

(6 citation statements)

References 32 publications

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“…The primary method by which the speciation and solubility of Al are regulated in the aluminum polymeric coagulant-electrocoagulation (APC-EC) process involves the hydrolysis and polymerization reactions of trivalent aluminum ions (Al þ3 ). In a theoretical context, the presence of several aluminum hydroxide species, namely, Al(OH) 3 (which is preferred for the coagulation process), Al(OH) þ5 4 , Al(OH) 13 (also preferred for the coagulation process), Al(OH) þ7 32 , and Al(OH) þ 2 , may be theoretically seen within the pH range of 3-5 (Lu et al 1999;Bingül et al 2023). The concentration of aluminum hydroxide (Al(OH) 3 ) decreased and was transformed into the aluminum hydroxide ion (Al(OH) À 4 ) when the pH decreased bellow 7 (Lu et al 1999;Bingül et al 2023).…”

Section: Resultsmentioning

confidence: 99%

“…In a theoretical context, the presence of several aluminum hydroxide species, namely, Al(OH) 3 (which is preferred for the coagulation process), Al(OH) þ5 4 , Al(OH) 13 (also preferred for the coagulation process), Al(OH) þ7 32 , and Al(OH) þ 2 , may be theoretically seen within the pH range of 3-5 (Lu et al 1999;Bingül et al 2023). The concentration of aluminum hydroxide (Al(OH) 3 ) decreased and was transformed into the aluminum hydroxide ion (Al(OH) À 4 ) when the pH decreased bellow 7 (Lu et al 1999;Bingül et al 2023). According to the study findings, the optimal pH for achieving the maximum removal of COD and Cr þ3 was determined to be 5.6 by comparing Tables 3 and 4.…”

Section: Resultsmentioning

confidence: 99%

“…According to the study findings, the optimal pH for achieving the maximum removal of COD and Cr þ3 was determined to be 5.6 by comparing Tables 3 and 4. Hence, it can be deduced that the observed pH level is optimal for conducting EC due to the predominant formation of aluminum complexes (coagulants) in this pH range (Lu et al 1999;Bingül et al 2023).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Development of an electrocoagulation method using alternating pulse current to treat wastewater generated by tanneries

Al Hariri,

Atallah,

Hathal

2024

Water Quality Research Journal

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Direct current electrocoagulation has various drawbacks, including electrode passivation, heat creation from energy consumption, and high sludge formation. The restrictions limit its usage in tannery wastewater treatment. Therefore, alternating pulse current EC (APC-EC) was developed to solve these obstacles. The study was empirically examined, considering high-frequency (3,000–11,000 Hz), stirring speed (400–1,200 rpm), and reaction time (15–30 min). This research examined how factors affect chemical oxygen demand (COD) removal efficiency, turbidity from trivalent chromium (Cr+3), and energy consumption for perforated aluminum electrodes. The central composite design in the surface response design approach has improved various operational parameters in the APC-EC process for tannery wastewater treatment. The employment of mathematical and statistical methods resulted in optimal removal of COD, Cr+3, and turbidity while reducing energy usage. Using mathematical and statistical methods, we achieved maximum COD, Cr+3 ion, and turbidity reduction while reducing energy use. The investigation found that COD (70.3%), Cr+3 (89.56%), and turbidity (96%) were the most rapidly removed components at 11,000 Hz, 576 rpm, and 30 min. Surface response data explain high-frequency APC-EC dynamics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Development of an electrocoagulation method using alternating pulse current to treat wastewater generated by tanneries

Al Hariri,

Atallah,

Hathal

2024

Water Quality Research Journal

View full text Add to dashboard Cite

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“…In this case, since (OH -) ions precipitate as Al(OH) 3 , the rate of rise in pH slows down. Above this pH, due to the formation of soluble Al(OH) 4 in the environment, this compound buffers the pH of the water and prevents it from increasing further [29].…”

Section: Resultsmentioning

confidence: 99%

“…They are also preferred because hydroxides of aluminium and iron are poorly soluble in water. The reactions occurring in water when aluminium is used as electrode are given in Equation 1-3 [20].…”

Section: Introductionmentioning

confidence: 99%

The Effect of pH on Removal of Phosphate from Water Using Aluminum Electrodes by Electrocoagulation Method

İrdemez¹,

Bingül²,

Kul³

et al. 2021

El-Cezeri Fen Ve Mühendislik Dergisi

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In this study, the effect of wastewater pH on phosphate removal by electrocoagulation method using aluminum plate electrodes was investigated. For this purpose, experiments were carried out at initial pH values ranging from 3-10, and the effect of the initial pH of the wastewater on phosphate removal efficiency, energy consumption and reaction rate was analyzed. From the results obtained, it was determined that the initial pHs of the optimum wastewater was 3 and 4. Because at low pH, both phosphate removal efficiency is high and the energy consumption of the system is low. While 97% removal efficiency is reached in 20 minutes at pH i =3, it increases in this period with the increase of the wastewater initial pH. These data show that the removal rate is higher at lower initial pHs. While the 1st degree reaction rate constant at pH i =3 is k 1 =0.2154 min -1 , this value decreases to k 1 =0.071 min -1 at pH i =10. At pH i =3, the energy consumption of the system has been determined as 0.553 kWh m -3 in 12 minutes of contact time. In addition, in the measurements made during the trials, it was observed that the highest PO 4 -P removal occurred during the period when the pH of the system was between 5-7.

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Membrane Reactor and Moving Bed Biofilm Reactor for Tannery Wastewater Treatment

Raja

Anandkumar²,

Sahariah³

2023

Modern Approaches in Waste Bioremediation

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Effect of controlled and uncontrolled pH on tannery wastewater treatment by the electrocoagulation process

Cited by 11 publications

References 32 publications

Development of an electrocoagulation method using alternating pulse current to treat wastewater generated by tanneries

Development of an electrocoagulation method using alternating pulse current to treat wastewater generated by tanneries

The Effect of pH on Removal of Phosphate from Water Using Aluminum Electrodes by Electrocoagulation Method

Membrane Reactor and Moving Bed Biofilm Reactor for Tannery Wastewater Treatment

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