Distribution of trace metals (Cu, Pb, Ni, Zn) between particulate, colloidal and truly dissolved fractions in wastewater treatment

Hargreaves, Andrew J.; Vale, Peter; Whelan, Jonathan; Constantino, Carlos J. L.; Dotro, Gabriela; Campo, Pablo; Cartmell, Elise

doi:10.1016/j.chemosphere.2017.02.034

Cited by 34 publications

(48 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Except for As and Zn, which are distributed equally between the two fractions, all other metal species are principally distributed in the NP fraction. These results confirm the high affinity of metal species with carbon-based colloids generally observed in the environment (Dai et al, 1995; M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT Hargreaves et al, 2017;Sau et al, 2010;Waeles et al, 2008). A recent work from Hargreaves et al showed that wastewater effluent contained a considerable distribution of metal (Cu, Pb, Ni and Zn) in the nanoscale fraction adsorbed and/or complexed with non-humic macromolecules, such as soot nanoparticles (Hargreaves et al, 2017).…”

Section: Accepted Manuscript 11supporting

confidence: 76%

Nano-litter from cigarette butts: Environmental implications and urgent consideration

et al. 2018

View full text Add to dashboard Cite

Cigarette butts (CGB) are equivalent to plastic litter in terms of number of pieces released directly into the environment. Due to their small size and social use, CGB are commonly found in natural systems, and several questions have been raised concerning the contaminants that are released with CGB, including metals, organic species, and nanoparticles. The aim of the present study is to investigate the release of nanoscale particles from CGB by leaching with rainwater. After seven days of passive stirring of both smoked and unsmoked CGB in synthetic rainwater, the solutions were treated and analyzed by specific nano-analytical methods. Our results demonstrate the release of 4.12 ± 0.24% (w/CGB) organic carbon in the range of 10 nm up to 400 nm and with a z-average diameter of 202.4 ± 74.1 nm. The fractal dimension (D) of the nanoscale particles ranges from 1.14 to 1.52 and suggests a soot (carbon)-based composition. The analysis of some metallic species (As, Pb, Cd, Cu, Ni, Cr, Co, Al, Mn, Zn, and Fe) shows that these species are essentially attached to the nanoscale particles per gram of carbon released. By considering the diffusion of the nanomaterials into different environmental compartments, our results suggest a new emerging and global contamination of the environment by cigarette butts, comparable to plastic litter, which urgently needs to be considered.

show abstract

Section: Accepted Manuscript 11supporting

confidence: 76%

Nano-litter from cigarette butts: Environmental implications and urgent consideration

et al. 2018

View full text Add to dashboard Cite

show abstract

“…4 panels a and b, respectively). Studies (Hargreaves et al 2017(Hargreaves et al , 2018 have reported that these metals are mainly bound to particulate and colloidal materials that readily adsorb to the surface of flocs. Hence, elimination of Cu and Pb by CF was expected.…”

Section: Metalsmentioning

confidence: 99%

“…Conversely, Ni and Zn abound in the soluble fraction, which requires adsorption/ion exchange processes or chemical modification for their effective elimination (Martin et al 1995). Such two-fraction distinction has been challenged by recent findings (Worms et al 2010;Hargreaves et al 2017Hargreaves et al , 2018) that indicate metals can adsorb or complex with organic material within the colloidal size fraction (1 kDa-0.45 µm). Such findings suggest that technologies capable of removing particles within the colloidal fraction have good potential to enhance metals removal from wastewater (Hargreaves et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Coagulation–flocculation process with metal salts, synthetic polymers and biopolymers for the removal of trace metals (Cu, Pb, Ni, Zn) from municipal wastewater

Hargreaves

Vale

Whelan

et al. 2018

Clean Techn Environ Policy

Self Cite

View full text Add to dashboard Cite

To ensure compliance with regulatory standards, it is important to examine the potential of treatment technologies to enhance trace metal removal from wastewater. This study investigated the effectiveness of coagulation-flocculation at removing trace metals from humus effluent with ferric chloride (FeCl 3), the synthetic polymer polyethyleneimine (PEI) and the biopolymers chitosan and floculan. Effluent samples were collected from a trickling filter treatment works operating in the UK and contained 21 ± 4 μg/L Cu, 0.8 ± 0.1 μg/L Pb, 4 ± 1 μg/L Ni and 43 ± 9 μg/L Zn. The influence of coagulant dosage and the velocity and time of the slow mixing stage were studied via a series of jar tests. Chitosan and PEI had a moderate effect on the removal of trace metals (≤ 35%). FeCl 3 removed 48% Cu, 56% Pb and 41% Zn at the optimised dose of 0.10 mg/L. At the optimised dose of 0.25 mg/L, floculan removed 77% Cu, 68% Pb and 42% Zn. The dominant mechanism for particle removal by FeCl 3 was enmeshment in the precipitates (i.e. sweep flocculation), whereas, for floculan, inter-particle bridging was the dominant removal mechanism. Overall, FeCl 3 and floculan were found to be most effective at removing trace metals from wastewater.

show abstract

“…Hence, in this study, SHS molecular weight less than 1 kDa was designated as the low molecular weight SHS (LMHS), and the molecular weight higher than 1 kDa was designated as the high molecular weight SHS (HMHS). It is worth noting that the LMHS still contained various heavy metal species (free ion metals, binding with low molecular weight SHS) [17,18,19,20,21,22,23]. Moreover, the low molecular weight DOM and SHS had a metal and hydrophobic organic compound binding capacity [24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Cadmium (Cd) and Nickel (Ni) Distribution on Size-Fractioned Soil Humic Substance (SHS)

Hsieh

Chiu

Huang

et al. 2019

IJERPH

View full text Add to dashboard Cite

Soil humic substances (SHS) are heterogeneous, complex mixtures, whose concentration, chemical composition, and structure affect the transport and distribution of heavy metals. This study investigated the distribution behavior of two heavy metals [cadmium (Cd) and nickel (Ni)] in high molecular weight SHS (HMHS, 1 kDa–0.45 μm) and low molecular weight SHS (LMHS, <1 kDa) extracted from agricultural soils. The HMHS mass fractions were 45.1 ± 19.3%, 17.1 ± 6.7%, and 57.7 ± 18.5% for dissolved organic carbon (DOC), Cd, and Ni, respectively. The metal binding affinity, unit organic carbon binding with heavy metal ratios ([Me]/[DOC]), were between 0.41 ± 0.09 μmol/g-C and 7.29 ± 2.27 μmol/g-C. Cd preferred binding with LMHS (p < 0.001), while Ni preferred binding with HMHS (p < 0.001). The optical indicators SUVA254, SR, and FI were 3.16 ± 1.62 L/mg-C/m, 0.54 ± 0.18 and 1.57 ± 0.15, respectively for HMHS and 2.65 ± 1.25 L/mg-C/m, 0.40 ± 0.17, and 1.68 ± 0.12, respectively for LMHS. The HMHS contained more aromatic and lower FI values than LMHS. Multilinear regression showed a significant positive correlation between the measured predicted [Me]/[DOC] ratios (r = 0.52–0.72, p < 0.001). The results show that the optical indices can distinguish the chemical composition and structure of different size SHS and predict the binding ability of Me-SHS.

show abstract

Distribution of trace metals (Cu, Pb, Ni, Zn) between particulate, colloidal and truly dissolved fractions in wastewater treatment

Cited by 34 publications

References 33 publications

Nano-litter from cigarette butts: Environmental implications and urgent consideration

Nano-litter from cigarette butts: Environmental implications and urgent consideration

Coagulation–flocculation process with metal salts, synthetic polymers and biopolymers for the removal of trace metals (Cu, Pb, Ni, Zn) from municipal wastewater

Cadmium (Cd) and Nickel (Ni) Distribution on Size-Fractioned Soil Humic Substance (SHS)

Contact Info

Product

Resources

About