Remediation Options for the Treatment of Electroplating and Leather Tanning Effluent Containing Chromium—a Review

Agrawal, Atul; Kumar, Vinay; Pandey, B.D.

doi:10.1080/08827500600563319

Cited by 140 publications

(65 citation statements)

References 55 publications

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“…Scans of the solution were obtained every 10 min over a period of 3 h and show the removal of Cr(VI) from the solution. This is consistent with the reduction of Cr(VI) by PPy at other substrates [17][18][19][20][21][22]. The PPy was grown to a thickness of 0.5, 1.0 and 5.0 lm and similar UV-Vis experiments were performed in order to assess the effect of polymer thickness.…”

Section: Methodssupporting

confidence: 57%

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Remediation of chromium(VI) at polypyrrole-coated titanium

et al. 2009

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The application of conducting polypyrrole (PPy) and polyaniline (PAni) coated substrates in remediation of chromium, Cr(VI), is an area of considerable interest. Here, we discuss the implementation of PPy-coated titanium as a new material for the reduction of Cr(VI) to the less toxic trivalent state, Cr(III). An alkaline-peroxide based etching process was used to ensure the adhesion of the PPy coatings to the underlying titanium. The PPy films showed excellent resistance to acidic Cr(VI) solutions and remained adherent after continuous exposure to the solutions. In order to optimise the remediation process a number of experimental parameters were investigated, including the thickness of the PPy coating, the reduction potential used in pre-treatment of the PPy and the degree of solution agitation. The durability of the materials on exposure to the Cr(VI) test solutions made them suitable for repeated remediation experiments. Following several test-runs, the cleanup efficiency of the material was found to decrease slightly, however, increasing the exposure/experiment time resulted in significantly improved cleanup ability.

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Section: Methodssupporting

confidence: 57%

“…Typically, a substrate is coated with a layer of conducting polymer, which is then used to reduce the toxic Cr(VI) to Cr(III), Eq. 1, which can be removed by precipitation of the chromium hydroxide [19]. Unlike ferrous or photocatalytic based methods, the reducing agent, i.e.…”

Section: Introductionmentioning

confidence: 99%

Remediation of chromium(VI) at polypyrrole-coated titanium

et al. 2009

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“…These techniques, known as "removal-disposal", have numerous drawbacks, such as their high cost, low efficiency, lengthy and complex treatments for a wide variety of metals, and the formation of large amounts of toxic sub-products (Adki et al, 2013). Consequently, processes based on "recovery-reuse" are now being increasingly projected and used (Agrawal et al, 2006). Phytoremediation could avoid some of the problems of the aforementioned treatments, as it is a harmless procedure that respects the environment (Adki et al, 2013;Ali et al, 2013;Paz-Ferreiro et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Physicochemical and biological methods, such as precipitation-flocculation coupled with pre/post-oxidation, reduction and concentration, have all been studied (Agrawal et al, 2006) in order to decontaminate soils with a high content of heavy metals and to preserve the environment; they are also often employed to control environmental pollution. These techniques, known as "removal-disposal", have numerous drawbacks, such as their high cost, low efficiency, lengthy and complex treatments for a wide variety of metals, and the formation of large amounts of toxic sub-products (Adki et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Cobalt, chromium and nickel contents in soils and plants from a serpentinite quarry

et al. 2015

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Abstract. The former serpentinite quarry of Penas Albas (Moeche, Galicia, NW Spain) left behind a large amount of waste material scattered over the surrounding area, as well as tailing areas. In this area several soils were studied together with the vegetation growing spontaneously over them with the aim of identifying the bioavailability of heavy metals. The potential of spontaneous vegetation for phytoremediation and/or phytostabilization was evaluated. The pH of the soils ranges from neutral to basic, with very low organic matter and nitrogen contents. There are imbalances between exchangeable cations like potassium (K) and calcium (Ca), mainly due to high magnesium (Mg) content that can strongly limit plant production. Moreover, in all of the studied soils there are high levels of cobalt (Co), chromium (Cr) and nickel (Ni) ( >70, >1300 and >1300 mg kg −1 , respectively). They exceed the intervention limits indicated by soil guideline values. Different soil extractions were performed in order to evaluate bioavailability. CaCl 2 0.01 M is the most effective extraction reagent, although the reagent that best predicts plant availability is a mixture of low molecular weight organic acids. Festuca rubra, L. is the spontaneous plant growing in the soils that accumulates the highest amount of the metals, both in shoot and roots. Festuca also has the highest translocation factor values, although they are only > 1 for Cr. The bioconcentration factor is > 1 in all of the cases, except in the shoot of Juncus sp. for Co and Ni. The results indicate that Festuca is a phytostabilizer of Co and Ni and an accumulator of Cr, while Juncus sp. is suitable for phytostabilization.

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“…[1]. Chromium exists in several oxidation states ranging from -2 to +6, among which chromium (IV) and chromium (III) are the most significant because of their persistence and stability.…”

Section: Introductionmentioning

confidence: 99%

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

Basu¹,

Dasgupta²,

Chakraborty³

2014

IJBBB

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Abstract-Chromium (VI), one of the major pollutants released from tanneries, dye and textile industries, is highly toxic and carcinogenic in nature. Chemical methods for bulk treatment of industrial effluents often fail to reduce the level to meet the environmental regulations. For end of the pipe treatment, bioremediation is considered a better alternative. East Calcutta Wetlands, the major sewage treatment site of Kolkata (previously known as Calcutta), has been reported to be contaminated with several heavy metals including chromium (VI). Therefore, there is a possibility that bacterial population of this region can tolerate chromium (VI) and would be useful for bioremediation of chromium (VI). A strain of Bacillus subtilis isolated from this region was grown in presence of chromium (VI) (2.5 g/L-7.5 5 g/L). There were 97% and 90% reduction of residual chromium concentration in growth media after 24 hours with initial concentrations of 2.5 g/L and 5 g/L respectively. Best removal was observed at 30C. Growth of the Bacillus strain in presence of chromium (VI) was found to be best fit for Tessier model by non-linear regression analysis using MATLAB® 7.4. The Bacillus strain has the potential for the end of the pipe treatment removal of chromium (VI).

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Remediation Options for the Treatment of Electroplating and Leather Tanning Effluent Containing Chromium—a Review

Cited by 140 publications

References 55 publications

Remediation of chromium(VI) at polypyrrole-coated titanium

Remediation of chromium(VI) at polypyrrole-coated titanium

Cobalt, chromium and nickel contents in soils and plants from a serpentinite quarry

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

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