Toxic metals removal from waste waters by upflow filtration with floating filter medium. I. The case of zinc

Zouboulis, Anastasios; Lazaridis, Nikolaos; Grohmann, A.

doi:10.1081/ss-120000795

Cited by 36 publications

(16 citation statements)

References 8 publications

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“…Optimal pH for the hydroxide precipitation in pure zinc solution is in the range of 9.0 to 9.8. However, the optimal pH for actual wastewater is fluctuated because of the different aquatic speciation (Zouboulis et al 2002). As the result of fluctuation in the optimal pH and effluent of zinc hydroxide colloids, zinc concentration in effluent exceeds the effluent regulation of 2 mg/L in some cases (Inamoto 2006).…”

Section: Introductionmentioning

confidence: 98%

Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron

Kishimoto

Iwano

Narazaki

2011

Water Air Soil Pollut

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Mechanism of zinc iron removal by zerovalent iron was discussed through zinc removal responses to several operational conditions of a packed column reactor with zero-valent iron powder. The adsorption isotherm observed implied that a kind of chemisorption was responsible for zinc removal. Zinc removal by zero-valent iron was enhanced by dissolved oxygen and ferric ion addition. However, it was deteriorated under acidic pH. In addition, zinc adsorbed on zero-valent iron was eluted by a reducing agent such as citric acid, whereas the zinc was not eluted by diluted sulfuric acid. Consequently, the zinc removal mechanism by zero-valent iron was inferred to be as follows: Zero-valent iron was firstly corroded and oxidized into ferric ion by dissolved oxygen. The ferric ion was precipitated as iron hydroxide onto the surface of the zero-valent iron powder. Zinc ion was adsorbed on and/or coprecipitated with the iron hydroxide. The iron hydroxide was finally oxidized and transformed into iron oxides.

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Section: Introductionmentioning

confidence: 98%

Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron

Kishimoto

Iwano

Narazaki

2011

Water Air Soil Pollut

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“…Methods such as coagulation [14], flocculation [15], froth flotation [16], filtration [17], ion exchange [18], aerobic and anaerobic treatment [19][20][21], and reverse osmosis [22] are commonly used to treat effluents, but these methods are not completely effective or economically advantageous in treating these compounds due to cost factors and the formation of by-products [3,23].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of the reactive gray BF-2R dye on orange peel: kinetics and equilibrium studies

Nascimento

Duarte

Campos

et al. 2014

Desalination and Water Treatment

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A B S T R A C TAdsorption of the reactive gray BF-2R dye from an aqueous solution using orange peel as the adsorbent was investigated by the batch method. Experiments characterizing the chemical and physical properties of the adsorbent found that orange peel is a microporous material with a pH zpc 3.9 and containing carboxylic and sulfonic groups. The greatest adsorption capacity was obtained using a 2 3 factorial design for 0.25 g of adsorbent, particle size < 0.419 mm and at 300 rpm. The pseudo-second-order model provided the best fit of the experimental data. The Weber-Morris model indicated that two or more mechanisms control the process. Statistical analysis of the equilibrium studies indicated that there was not a significant difference between the Langmuir and the Fritz-Schlunder models according to an F-test. The results showed that orange peel can remove the reactive gray BF-2R dye.

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“…3 A number of technologies are available to control and reduce the water pollution with dye contaminants. Among them are coagulation 4 , filtration 5 , ionexchange, 6 electrolysis, 7 advanced oxidation processes 8 , foam flotation, 9 etc. The removal of dyes in an economic way remains an important problem, although a number of systems have been developed using adsorption techniques.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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The adsorption of malachite green (MG) from aqueous solution by waste green tea (WGT) biomass was investigated. A series of experiments in batch conditions were conducted in order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum removal efficiency for untreated WGT was 89% (4 g biomass, 100 mL solution of 94 mg/L, 316 K). It was found that the adsorption of MG increased by increasing temperature from 296 to 316 K. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) were calculated, and indicated that dye adsorption onto the studied biomass was endothermic and non-spontaneous. Six chemical treatments were tested (four acidic -H 3 PO 4 , H 2 SO 4 , HCl, and tartaric acid, one oxidant -H 2 O 2 , and one basic -NaOH) in order to study the chemical groups responsible for MG adsorption onto WGT biomass. The alkali and acidic treatments led to an increase of adsorption efficiency up to 92% and 95% (H 2 SO 4 ) respectively. The FTIR spectroscopy results emphasized the modifications of the biomass surface and how these are influencing the adsorption process.

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Toxic metals removal from waste waters by upflow filtration with floating filter medium. I. The case of zinc

Cited by 36 publications

References 8 publications

Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron

Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron

Adsorption of the reactive gray BF-2R dye on orange peel: kinetics and equilibrium studies

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

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