Heavy metals recovery from industrial wastewater using Taguchi method

Kaminari, N.M.S.; Schultz, D.R.; Ponte, Maria José Jerônimo de Santana; Ponte, Haroldo de Araújo; Marino, Cláudia Eliana Bruno; Neto, A. Canal

doi:10.1016/j.cej.2006.08.024

Cited by 49 publications

(18 citation statements)

References 21 publications

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“…Year after year, the interest in the development of effective electrochemical methods for elimination and recovery of metallic ions from residual waters has increased because studies have demonstrated the possibility of recovering the metals in a pure state [28,29].…”

Section: Introductionmentioning

confidence: 99%

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Reyes-Valderrama

Salinas‐Rodríguez

Montiel‐Hernández

et al. 2017

Metals

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Abstract:We report potentiodynamic studies to characterize copper, nickel and zinc leaching solutions from electronic waste. The metals were leached using oxygen and sulfuric acid (pH = 1.5). As is known, reduction potentials are determined using thermodynamics laws, and metal recovery strategies from electronic waste are usually considered according these thermodynamic values. Pourbaix-type diagrams are not appropriate to plan strategies in electrochemical processing. Therefore, knowledge of electrode potentials for the metal deposit/dissolution process is the basis for the selective recovery planning. For this reason, potentiodynamic studies, specifically cyclic voltammetry, are revealed as a good way to decide the best conditions for the process of electrochemical recovery of metals from electronic waste, which is also cost-efficient and has no interference from strange ions, such as lead, in this case.

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Section: Introductionmentioning

confidence: 99%

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Reyes-Valderrama

Salinas‐Rodríguez

Montiel‐Hernández

et al. 2017

Metals

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“…The most important Taguchi design is fractional factorial design which is used for estimating the effects of many factors with two or more levels on the response using orthogonal array 24,25 . The analysis of the experimental data using ANOVA estimate the effect of the factors on the characteristics properties 19 .…”

Section: Taguchi Methodsmentioning

confidence: 99%

“…The degree of the effect that each influential factor has on the characteristics of the output can be expressed in the form of an equation by an experimental design. The goals of experimental design in this study include reducing the number of experiments, lowering costs and determining the variables with the most effect on response 18,19 . The removal of unnecessary factors, calculating the percentage of importance of each variable, determining the extent of error and determining the optimum conditions are among other goals of the experimental design.…”

Section: Introductionmentioning

confidence: 99%

Specification of the Operational Parameters Contribution in the Efficiency of TiO2-P25 Nanoparticles in the Photocatalytic Removal of Cr(VI) by Taguchi Method

Sabonian¹,

Behnajady²

2014

Orient J Chem

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Chromium exists in environment both as trivalent [Cr(III)] and hexavalent [Cr(VI)] forms. However, hexavalent form is five hundred times more toxic than the trivalent form. Heterogeneous photocatalysis processes, using aqueous suspensions of semiconductors, have received considerable attention in the removal of toxic metals from aqueous media. In this work the nanoparticles of TiO 2 -P25 in the form of slurry were used for photoreduction of Cr(VI) to the less harmful Cr(III). The process has been conducted in different operational conditions such as different initial concentrations of Cr(VI), dosage of photocatalyst, irradiation times, irradiation intensities of light and pH. For the optimization of the process Taguchi experimental design was used. The results of optimization using the Taguchi method, indicated that the pH with 28%, initial concentration of Cr(VI) with 26.99% and dosage of TiO 2 nanocatalyst with 20.53% have the most effects among the selected factors. The intensity of UV light irradiation has the least effect on the efficiency of the process.

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“…Heavy metals in liquid wasted water are usually removed by chemical and electrochemical methods (Kaminari et al, 2007;Hunsom et al, 2005). Thiobacillus ferrooxidans and Thiobacillus thiooxidans are the common micro-organisms used in bio-leaching methods.…”

Section: Introductionmentioning

confidence: 99%

Using microbiological leaching method to remove heavy metals from sludge

Gu¹,

Aikebaier²,

Arefieva³

et al. 2017

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 13.05.2016 Accepted : 11.07.2016 Microbial leaching is one of the most effective methods to remove heavy metals from sludge. In the conducted researches, the sludge samples were processed with Thiobacillus ferrooxidans and Thiobacillus thiooxidans obtained via cultivation, extraction and purification processes. Heavy metals such as Pb, Cd, Cu and Ni were leached from sludge by Thiobacillus ferrooxidans and Thiobacillus thiooxidans within different substrate concentration and pH value conditions. It is defined that from the point of view of economy and efficiency the optimal concentration of FeSO4.7H2O and sulfur for bio-leaching process was 0.2 g. The leaching rates of heavy metals such as Pb, Cd, Cu and Ni of the same concentration were 74.72%, 81.54%, 70.46% and 77.35% respectively. However, no significant differences depending on the pH value among the leaching rates were defined, even for the pH value of 1.5. Along with the removal of heavy metals from sludge, the organic matter, N, P, K were also leached to some extent. The losing rate of phosphorus was the highest and reached 38.44%. However, the content of organic matter, N, P, K in the processed sludge were higher in comparison with level I of the National Soil Quality Standards of China. Ecological risk of heavy metals in sludge before and after leaching was assessed by Index of Geo-accumulation (Igeo) and comprehensive potential risk (RI). The results of research defined that the content of heavy metals in sludge meets the level of low ecological risk after leaching and their contents is lower in comparison with the National Agricultural Sludge Standard of China. Sludge leached by biological methods is possible to use for treatment for increasing soil fertility.

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Heavy metals recovery from industrial wastewater using Taguchi method

Cited by 49 publications

References 21 publications

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Specification of the Operational Parameters Contribution in the Efficiency of TiO2-P25 Nanoparticles in the Photocatalytic Removal of Cr(VI) by Taguchi Method

Using microbiological leaching method to remove heavy metals from sludge

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