Electrocoagulation treatment of mine water from the deepest working European metal mine – Performance, isotherm and kinetic studies

Nariyan, Elham; Sillanpää, Mika; Wolkersdorfer, Christian

doi:10.1016/j.seppur.2016.12.042

Cited by 77 publications

(26 citation statements)

References 35 publications

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“…The Langmuir isotherm is commonly used to describe the monolayer adsorption on the homogeneous sites of sorbent . The good fitting of the sorption to the Freundlich isotherm suggests that the sorption of salt ions on the two electrodes is not restricted to one specific class of sites and the adsorption of ions occurs on a heterogeneous surface by monolayer sorption . There are large amounts of oxygen‐containing functional groups on the surface of MWCTNs and MWCNTs‐m electrodes.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

2018

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Multiwalled carbon nanotubes (MWCNTs) were treated by nitric acid to probe the effect of nitric acid modification on their properties and desalination performance in capacitive deionization (CDI). The nitric acid modification exerts a slight influence on the morphologies, specific surface area, and pore properties of the MWCNTs but can increase the amount of oxygen-containing functional groups and then obviously enhance the specific capacitance of the electrodes. Thus, the desalination efficiency can be significantly improved as the modified MWCNTs serve as electrodes in CDI. The adsorption of salt ions on the original and modified MWCNT electrode is fitted well by the Freundlich isotherm other than the Langmuir isotherm.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

2018

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“…EC performance can be also influenced by characteristics of the aqueous medium, especially pH of the electrolyte [15,[20][21][22]24]. A set of experiments were carried out by ranging initial pH between 2 and 12.…”

Section: The Ph Effectsmentioning

confidence: 99%

“…Similar results have been reported previously by several authors while determining the most suitable kinetic model for 1-phenylazo-2-naphthol (PAN), alizarin saphirol (AS), indigo carmine (IC) [1,[27][28][29][30]. On the other hand, other researchers determined the pseudo-first order as a suitable model to describe the kinetics for the following dyes: Rhodamine B (RhB), alizarin red S (ARS), methyl orange (MO), congo red (CR), methylene blue (BMylene), methyl blue (BM-yl) [14,20,27,29,[31][32][33][34].…”

Section: Determination Of Kinetic Model For Mb Removalmentioning

confidence: 99%

Removal of Methylene Blue in aqueous solutions by Electrocoagulation process: Adsorption, Kinetics, studies

et al. 2018

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The purpose of this study is to understand the mechanism driving the removal of methylene blue through electrocoagulation process. Experiments were carried out using iron as anode and cathode in a batch electrochemical cell operated in a monopolar configuration. The effects of operating parameters (initial pH, current density, initial dye concentration and energy consumption) on the removal of methylene blue from solution were investigated. The results showed that the optimum removal efficiency of 93.2% was achieved for a current density of 9.66 mA/cm2, optimal pH of 8±0.01 with a specific energy consumption of 7.451 kWh/m3. Afterwards, first and second-order rate equations were successively applied to study adsorption kinetics models. On top of usual correlation coefficients (r2), statistical test Chi-square (χ2) were applied to evaluate goodness of fit and consequently find out the best kinetic model. Results showed that MB adsorption process onto iron hydroxides formed in aqueous solution during electrocoagulation treatment followed a second-order kinetic.

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“…A rather different electrochemical process for the treatment of AMD has been made by Nariyan et al 2017 who suggested establishing an electrocoagulation (EC) cell using aluminum and iron as sacrificial electrodes. Nevertheless, the main drawbacks of EC are the high cost of the sacrificial metal anodes (Bejan & Bunce 2015).…”

Section: Mining Wastewater Treatmentmentioning

confidence: 99%

“…However, the removal of metals present in AMD can be increased with the current density (Oncel et al 2013). As an example, the electrocoagulation (EC) process was able to achieve higher removal efficiencies (>99.9%) at pH of 2.5 as compared to the results obtained with the chemical precipitation at pH 8 (Nariyan, Sillanpää & Wolkersdorfer 2017). In similar condition, BESs could enhance metal removal from AMD in particular, but has not been investigated to date.…”

Section: Bio-electrochemical System As a Resource Recovery And Treatmmentioning

confidence: 99%

Bio-Electrochemical process for Metal and Sulfur Recovery from Acid Mine Drainage

Zamora¹,

Alonso²

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Water recycling and resource recovery from acid mine drainage (AMD) are increasingly being regarded as desirable practices with direct benefits for the environment and the operational and economic viability of the resources sector.This thesis proves the concept of a novel bioelectrochemical system (BES) for the direct electrode-driven resource recovery and practically permanent AMD treatment. The technology consists of a two-cell bioelectrochemical setup to enable the removal of sulfate from the ongoing reduction-oxidation sulfur cycle, thereby also reducing salinity, without external addition of chemicals.In particular, the goals of this thesis are: (i) to enrich a sulfate reducing bacterial community capable of directly utilising a carbon based cathode as electron donor for autotrophic sulfate reduction, or via bioelectrochemically-produced H 2 ; (ii) to elucidate the electron flux pathways of autotrophic sulfate reduction and microbial interactions in cathodic mixed cultures; (iii) to develop a high-rate sulfate reducing bioelectrochemical reactor based on high surface area electrode materials; (iv) to design and implement a combined chemical-free bioelectrochemical process that enables the sulfur, metal and water recovery from AMD.In order to elucidate whether cathodes can effectively release electrons and act as the only electron donor to support sulfate reduction process, the effect of cathode potential and inoculum source were evaluated using electrochemical tools, including the recording of chronoamperometry and cyclic/linear sweep voltammetry (Chapter 5). Electrochemical and off-gas analysis coupled to liquid phase sampling was carried out to determine the electron fluxes from the electrode to the final electron acceptor (sulfate) during autotrophic sulfate reduction (Chapter 6). Fluorescence in situ hybridization (FISH) and digital image analysis (DAIME) of the microbial communities in z-stack confirmed the microbial stratification. After obtaining a well-functioning biocathode for autotrophic sulfate reduction, its performance was experimentally optimised in terms of high-surface area electrode materials, like multi-wall carbon nanotubes on reticulated vitreous carbon (MWCNT-RVC) and carbon granules (CG) (Chapter 7). Finally, a novel BES was tested for AMD treatment , outcompeting methanogens and homoacetogens for the hydrogen without the need to add chemical inhibitors.The findings of this thesis show that inexpensive CG can achieve higher current-tosulfide efficiencies at lower power consumption than the nano-modified three-dimensional MWCNT-RVC. Sequencing analysis of the 16S rRNA gene on day 58 revealed that MWCNT-RVC retained the bacteria and archaea population from the inoculum, while CG electrode surface was able to select for bacteria over archaea.The feasibility to integrate a two-stage BES was proven with a lab-scale setup for AMD treatment. Using AMD, the BES operation enhanced the sulfate reduction rate ( The solid metal-sludge was 2 times less voluminous and 9 times more readily s...

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Electrocoagulation treatment of mine water from the deepest working European metal mine – Performance, isotherm and kinetic studies

Cited by 77 publications

References 35 publications

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

Removal of Methylene Blue in aqueous solutions by Electrocoagulation process: Adsorption, Kinetics, studies

Bio-Electrochemical process for Metal and Sulfur Recovery from Acid Mine Drainage

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