A membrane electroflotation process for recovery of recyclable chromium(III) from tannery spent liquor effluent

Selvaraj, Rajeswari; Santhanam, Manikandan; Selvamani, V.; Sundaramoorthy, Sundarapandiyan; Maruthamuthu, S.

doi:10.1016/j.jhazmat.2017.11.052

Cited by 37 publications

(9 citation statements)

References 35 publications

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“…The samples were given a 30 min settling time to bring about coagulation and the supernatant was then taken for quality measurements [29]. The removal of Cr(III) was evaluated by atomic absorption spectroscopy (AAS) [30].…”

Section: Ecp Reactor and Proceduresmentioning

confidence: 99%

“…(8) and (9)] promote the production of ferric hydroxo complexes. The decrease in removal concentration of Cr(III) may also be due to the formation of Fe(OH) + , which has lesser reaction rate resulting in decreased hydroxyl radical production thereby reducing the oxidation efficiency [30,34]. So it is evident that when the increasing pH > 3, the removal rate of Cr(III) concentration is decreased [17].…”

Section: Effect Of Phmentioning

confidence: 99%

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Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selvabharathi¹,

Adishkumar²,

Banu³

2019

DWT

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Chromium(III) used in tanning process is not consumed fully and around 30-40% of Chromium(III) is washed away to the environment causing severe environmental problem especially to the aquatic system. To remove Chromium(III) from wastewater, many different treatment techniques have been developed. This study deals with the ability of electrochemical peroxidation process for the removal of Chromium(III) from tannery wastewater in a batch stirred tank bench scale reactor with hopper bottom of 5 L working volume equipped with two iron electrodes which were investigated. The removal percentage of chromium was determined by varying operating parameters such as pH = 2-8, Fe 2+ = 2-5 mg/L, H 2 O 2 = 5-20 mg/L and current density = 10-40 mA/cm 2 were studied. The results showed that the Chromium(III) removal efficiency of 87% was achieved under optimum condition such as pH = 2, Fe 2+ = 2 mg/L H 2 O 2 = 15 mg/L, current density = 30 mA/cm 2 and contact time was 120 min with an electrical energy consumption of 0.073 kWh/L. The operating costs for the removal of Chromium(III) was found to be 0.4 $/m 3 for treated tannery wastewater. The electrochemical peroxidation process proved to be an efficient and appropriate technique for the removal of Chromium(III) from tannery wastewater.

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Section: Ecp Reactor and Proceduresmentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selvabharathi¹,

Adishkumar²,

Banu³

2019

DWT

View full text Add to dashboard Cite

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“…Various techniques including chemical precipitation [3], ion exchange [4], membrane extraction [5], electrochemical separation [6], and adsorption [7][8][9][10][11][12][13] have been applied for heavy metal scavenging. In particular, adsorption is recognized as one of the most promising techniques due to its high efficiency, design flexibility, operation easiness, and low cost.…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient Adsorbent Based On Starch-Graphene Oxide Architecture For Scavenging Aqueous Pb(II): Isotherms, Kinetics, Thermodynamics And Interaction Mechanism

Guo

Bulin

Zhang

et al. 2021

Preprint

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Heavy metal pollution stems from the modern industry is a severe environmental problem. In this work, a highly efficient adsorbent based on starch-graphene oxide architecture (SGO) was fabricated, characterized and employed to scavenge aqueous Pb(Π). The scavenging performance was evaluated, and the interaction mechanism between SGO and Pb(Π) was elucidated. Results indicate, the starch introduction brought performance enhancement, consequently made SGO outperform both single starch and GO in terms of adsorption efficiency. SGO adsorbs 95.83 % of Pb(Π) in 16 min, with adsorption capacity 383.32 mg•g− 1, manifesting some advantages over other analogous adsorbents, such as higher capacity and faster kinetics. The chemical interaction between Pb(OH)+ and C = O, C-O related groups in SGO supported the adsorption, which was a spontaneous, exothermic and entropy increasing process. The adsorption was well described by the Freundlich, pseudo-second-order model and Intra-particle diffusion models, both intra-particle diffusion and chemical interaction were the rate controlling steps. Based on its high adsorption efficiency, SGO may have promising application in heavy metal scavenging from water.

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“…Various technologies, including adsorption [5], precipitation [6], flotation [6,7] electroflotation [8,9], ion exchange [10], solvent extraction [4], and membrane filtration [11], are utilized for the separation of heavy metals from industrial effluent. Among these techniques, adsorption is considered a promising method for removing heavy metal from effluent because of its distinct advantages over other technologies, including easy to operate, cost-effective, and element trace metal ions [5,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization of Magnetic Oil Palm Empty Fruits Bunch Cellulose Nanofiber Composite as a Bio-Sorbent for Cu(II) and Cr(VI) Removal

et al. 2020

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In the present study, magnetic oil palm empty fruits bunch cellulose nanofiber (M-OPEFB-CNF) composite was isolated by sol-gel method using cellulose nanofiber (CNF) obtained from oil palm empty fruits bunch (OPEFB) and Fe3O4 as magnetite. Several analytical methods were utilized to characterize the mechanical, chemical, thermal, and morphological properties of the isolated CNF and M-OPEFB-CNF. Subsequently, the isolated M-OPEFB-CNF composite was utilized for the adsorption of Cr(VI) and Cu(II) from aqueous solution with varying parameters, such as pH, adsorbent doses, treatment time, and temperature. Results showed that the M-OPEFB-CNF as an effective bio-sorbent for the removal of Cu(II) and Cr(VI) from aqueous solution. The adsorption isotherm modeling revealed that the Freundlich equation better describes the adsorption of Cu(II) and Cr(VI) on M-OPEFB-CNF composite. The kinetics studies revealed the pseudo-second-order kinetics model was a better-described kinetics model for the removal of Cu(II) and Cr(VI) using M-OPEFB-CNF composite as bio-sorbent. The findings of the present study showed that the M-OPEFB-CNF composite has the potential to be utilized as a bio-sorbent for heavy metals removal.

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A membrane electroflotation process for recovery of recyclable chromium(III) from tannery spent liquor effluent

Cited by 37 publications

References 35 publications

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

A Highly Efficient Adsorbent Based On Starch-Graphene Oxide Architecture For Scavenging Aqueous Pb(II): Isotherms, Kinetics, Thermodynamics And Interaction Mechanism

Isolation and Characterization of Magnetic Oil Palm Empty Fruits Bunch Cellulose Nanofiber Composite as a Bio-Sorbent for Cu(II) and Cr(VI) Removal

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