Removal of hexavalent chromium from electroplating wastewaters using marine macroalga Pelvetia canaliculata as natural electron donor

Hackbarth, Fabíola V.; Maass, Danielle; Souza, Antônio Augusto Ulson de; Vilar, Vítor J.P.; Souza, Selene M.A. Guelli U. de

doi:10.1016/j.cej.2016.01.070

Cited by 64 publications

(15 citation statements)

References 34 publications

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“…Electroplating is a metalwork industry activity in which the treatment of metal surfaces is carried out through chemical and/or electrochemical processes [4]. It involves a sequence of pretreatment, coating and conversion baths, that lead to several types of wastewaters containing high amounts of metals, principally zinc, iron and hexavalent chromium [4]. Chromium (Cr) species are also waste byproducts of electroplating activities.…”

Section: Introductionmentioning

confidence: 99%

Reducing Cr6+ in electroplating wastewater with Bacillus cereus strain B1

2019

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In this study Bacillus cereus was used to evaluate the Cr6+ reducing capacity in electroplating effluents. TheCr6+ bioreduction assays were carried out using real waste water (RWW) from an electroplating plant and artificial wastewater (AWW), with and without added glucose. The AWW was prepared using Ni ,Zn ,Cu, Pb, and Cr salts, simulating RWW concentrations. The Cr6+ concentration and bacterial growth were monitored three times a day for the duration of five days. Also, were evaluated the effects of wastewater on B. cereus B1 morphology using scanning electron microscopy. Cr6+ reduction percentage of 100 % was reached for AWW containing glucose, of 71 % for AWW without glucose, of 75.6 % for RWW with glucose, and of 31.7 % for RWW without glucose. Despite the low reduction percentage obtained for RWW without glucose, concentrations of 0.14 mg/L of Cr6+ were reached, which were within allowed limits (0.5mg/L of Cr6+). Electron Microscopy showed alterations in the bacterial cell wall and a decrease in size, mainly in the bacteria exposed to RWW. The results allow us to propose B. cereus B1 as a promising microorganism for use in the bioremediation of effluents containing Cr6+.

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Section: Introductionmentioning

confidence: 99%

Reducing Cr6+ in electroplating wastewater with Bacillus cereus strain B1

2019

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“…Alginates and fucoidans contained in the cells walls of P. canaliculata are poly-anions due to the presence of carboxylic and sulfonic groups, and as a consequence this alga can act as a natural cation exchanger. This ability is widely documented in the scientific literature, and it was proposed to use P. canaliculata biomass to sequestrate and remove metal ions (zinc, iron, copper, trivalent chromium, lead, nickel) from industrial wastewaters [64][65][66].…”

Section: Anti-pollution Ingredients From Algaementioning

confidence: 99%

Cosmetic Functional Ingredients from Botanical Sources for Anti-Pollution Skincare Products

Juliano

Magrini

2018

Cosmetics

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Air pollution is a rising problem in many metropolitan areas around the world. Airborne contaminants are predominantly derived from anthropogenic activities, and include carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds, ozone and particulate matter (PM; a mixture of solid and liquid particles of variable size and composition, able to absorb and delivery a large number of pollutants). The exposure to these air pollutants is associated to detrimental effects on human skin, such as premature aging, pigment spot formation, skin rashes and eczema, and can worsen some skin conditions, such as atopic dermatitis. A cosmetic approach to this problem involves the topical application of skincare products containing functional ingredients able to counteract pollution-induced skin damage. Considering that the demand for natural actives is growing in all segments of global cosmetic market, the aim of this review is to describe some commercial cosmetic ingredients obtained from botanical sources able to reduce the impact of air pollutants on human skin with different mechanisms, providing a scientific rationale for their use.

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“…In recent years, the electroplating industry is developing rapidly and the yield of electroplating wastewater is up to 4 billion m 3 each year [1]. Cyanide has been gradually replaced by phosphate in plating cleaning, descaling, and anticorrosion due to the lower toxicity of phosphate [2].…”

Section: Introductionmentioning

confidence: 99%

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Guan

Tian

2017

Journal of Chemistry

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In this experiment, the porous calcium silicate hydrates (P-CSHs) were prepared via a hydrothermal method and then modified by polyethylene glycol (PEG). The modified P-CSHs combined with an internal recycle reactor could successfully recover the phosphorus from electroplating wastewater. The modified P-CSHs were characterized by X-ray diffraction (XRD), N 2 adsorptiondesorption isotherms, and Fourier transform infrared spectroscopy (FT-IR). After compared with different samples, the modified P-CSHs-PEG2000 sample had larger specific surface area of 87.48 m 2 /g and higher pore volume of 0.33 cm 3 /g, indicating a high capacity for phosphorus recovery. In the process of phosphorus recovery, the pH value of solution was increased to 9.5, which would enhance the recovery efficiency of phosphorus. The dissolution rate of Ca 2+ from P-CSH-PEG2000 was fast, which was favorable for phosphorus precipitation and phosphorus recovery. The effects of initial concentration of phosphorus, P-CSHs-PEG2000 dosage, and stirring speed on phosphorus recovery were analyzed, so the optimal operation conditions for phosphorus recovery were obtained. The deposition was analyzed by XRD, N 2 adsorption-desorption, and SEM techniques; it was indicated that the pore volume and surface area of the P-CSHs-PEG2000 were significantly reduced, and the deposition on the surface of P-CSHs-PEG2000 was hydroxyapatite.

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Removal of hexavalent chromium from electroplating wastewaters using marine macroalga Pelvetia canaliculata as natural electron donor

Cited by 64 publications

References 34 publications

Reducing Cr6+ in electroplating wastewater with Bacillus cereus strain B1

Reducing Cr6+ in electroplating wastewater with Bacillus cereus strain B1

Cosmetic Functional Ingredients from Botanical Sources for Anti-Pollution Skincare Products

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

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