Study of speciation of metals in an industrial sludge and evaluation of metal chelators for their removal

Nair, Anupa; Juwarkar, Asha A.; Devotta, S.

doi:10.1016/j.jhazmat.2007.07.054

Cited by 87 publications

(29 citation statements)

References 54 publications

(57 reference statements)

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“…A significant factor determining plant growth as well as trace elements' phytoextraction efficiency is occurrence (Nair et al 2008) and concentration levels of macro-and microelements in soil (interaction) (Fargašová and Beinrohr 1998;Walker and Bernal 2003;Ke et al 2007). Excess of one element with respect to another element usually is the cause of the physiological response of the plant (Benzarti et al 2008;Guala et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Copper phytoextraction with willow (Salix viminalis L.) under various Ca/Mg ratios. Part 1. Copper accumulation and plant morphology changes

et al. 2013

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This work reports a part of hydroponic experiment results concerning changes in Salix viminalis L. cv. 'Cannabina' morphology and physiology under stress conditions with different copper concentration levels and verifies our earlier results about the role of different Ca/Mg ratios in trace elements' accumulation efficiency. In this part, we present the copper accumulation and changes in willow biomass. Concentration of copper in roots, rods, shoots and leaves was analyzed with flame atomic absorption spectrometry. Selected indices characterizing copper accumulation and plant biomass structure were calculated to estimate the potential of willow to remove metal from polluted solution. Our results indicate a general increase of copper accumulation by selected willow organs with increase of copper concentration in modified Knop's medium. Moreover, significant differences in copper phytoextraction between plants under different Ca/Mg ratios were affirmed (1:10 [ 4:1 [ 20:1 [ 1: 1 / 4 ).

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Section: Introductionmentioning

confidence: 99%

Copper phytoextraction with willow (Salix viminalis L.) under various Ca/Mg ratios. Part 1. Copper accumulation and plant morphology changes

et al. 2013

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“…EDTA and citric acid effi ciencies for metals removal, determined previously by Nair et al for electroplating industry wastewater sludge, were signifi cantly lower [13]. That behavior suggested that metals ions bounding with matrix strictly determined the mobility of metal and optimization of extraction process conditions, especially extractant concentration, have to be considered as a fi rst step of experiment.…”

Section: Resultsmentioning

confidence: 77%

“…Generally EDTA, citric acid and other chelators were reported as useful agents for metals ions removal from industrial [10,13] and municipal sewage sludge [1], water sediments [6] as well as soil [18].…”

Section: Resultsmentioning

confidence: 99%

“…In comparison with other chelating agents, they present some advantages, mainly a high level of complexing capacity with respect to heavy metals [18] and a large stability as complexing agents [15]. Due to their high extraction effi ciency for most metals and high stability, EDTA and citric acid have been extensively investigated for applications in contaminated sediment remediation [9,13,15].…”

Section: Introductionmentioning

confidence: 99%

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Optimalization of Metals Ions Extraction from Industrial Wastewater Sludge with Chelating Agents / Optymalizacja Procesu Ekstrakcji Jonów Metali Z Przemysłowych Osadów Ściekowych Za Pomocą Roztworów Związków Chelatujących

Karwowska¹

2012

Archives of Environmental Protection

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Abstract:The report presents the results of selected heavy metals (Zn, Cu, Cd, Ni, Pb) removal from industrial wastewater sludge collected from metallurgy industry. As washing solutions two chelating agents were used: EDTA and citric acid. The study was focused on 0.000 (deionized water), 0.010, 0.050, 0.075, 0.100 M and 0.000, 0.050, 0.100, 0.500, 1.000 M, EDTA and citric acid solutions, respectively.Effi ciency of EDTA and citric acid solutions for metal removal was studied by extraction of sludge samples with chelators. Chemical extraction of selected metals was effective for both types of solution. Optimal concentration of EDTA was 0.100M for Zn, Ni and Cd, 0.075 M for Cu and Pb. Optimal concentration of citric acid was 0.500 M for all analyzed metals.

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“…Therefore, the bioavailability of heavy metals provides more important evidence of metal toxicity [32]. Even if the heavy metals concentration in sewage sludge or compost is far below the regulation limit, the long-term land application of compost with background heavy metals concentration can increase the content and accumulation of the heavy metals in the soil [10].…”

Section: Heavy Metals Bioavailabilitymentioning

confidence: 99%

Effects of Natural Zeolites on Bioavailability and Leachability of Heavy Metals in the Composting Process of Biodegradable Wastes

Singh¹,

Kalamdhad²,

Lee³

2016

Zeolites - Useful Minerals

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The bioavailability and leachability of heavy metals play an important role in the toxicity of heavy metals in the final compost followed by land application. This chapter examines the effects of natural zeolite on bioavailability of heavy metals (Zn, Cu, Mn, Fe, Ni, Pb, Cd, and Cr) in the form of water soluble and diethylenetriaminepentaacetic acid (DTPA) extractable. The toxicity characteristic leaching procedure (TCLP) test was performed to examine the leachability of heavy metals. Water solubility, DTPA extractability, leachability, and most bioavailable fractions were reduced during agitated pile composting (APC) and rotary drum composting (RDC) of water hyacinth with zeolite addition. The addition of the natural zeolite (clinoptilolite) during the composting process led to an increase in Na, Ca, and K concentrations and significantly reduced the water solubility and DTPA and TCLP extractability of heavy metals. The addition of an appropriate amount of natural zeolite during the composting process enhanced the organic matter degradation, thereby increasing the conversion into the most stabilized organic matter and reducing the bioavailability and leachability of heavy metals.

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Study of speciation of metals in an industrial sludge and evaluation of metal chelators for their removal

Cited by 87 publications

References 54 publications

Copper phytoextraction with willow (Salix viminalis L.) under various Ca/Mg ratios. Part 1. Copper accumulation and plant morphology changes

Copper phytoextraction with willow (Salix viminalis L.) under various Ca/Mg ratios. Part 1. Copper accumulation and plant morphology changes

Optimalization of Metals Ions Extraction from Industrial Wastewater Sludge with Chelating Agents / Optymalizacja Procesu Ekstrakcji Jonów Metali Z Przemysłowych Osadów Ściekowych Za Pomocą Roztworów Związków Chelatujących

Effects of Natural Zeolites on Bioavailability and Leachability of Heavy Metals in the Composting Process of Biodegradable Wastes

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