Heavy metal (Zn and Cu) complexation and molecular size distribution in wastewater treatment plant effluent

Chaminda, G. G. Tushara; Nakajima, Fumiyuki; Furumai, Hiroaki

doi:10.2166/wst.2008.480

Cited by 13 publications

(12 citation statements)

References 8 publications

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“…1. Full data set is shown for the comparison even though the Zn and Cu results for WWTP 2 in August, November and January have already been reported elsewhere (Chaminda et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…The labile metals, which were operationally defined as the entrapped metals in Empore TM chelating disk cartridge (3M 4371-HD, USA), were analyzed in accordance with the method described by Chaminda et al (2008). Simply, the labile metal measured by this chelating disk cartridge is representing the combined concentration of free metal ions in the original sample and quickly dissociated metals during the sample passage through the cartridge within around 5 minutes.…”

Section: Determination Of Total Dissolved and Labile Metal Concentratmentioning

confidence: 99%

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Metal (Zn, Cu, Cd and Ni) Complexation by Dissolved Organic Matter (DOM) in Wastewater Treatment Plant Effluent

Chaminda

Nakajima

Furumai

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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Eight effluent samples were collected from four conventional activated sludge wastewater treatment plants (WWTPs) to determine the complexation of Zn, Cu, Cd and Ni by dissolved organic matter (DOM) in WWTP effluent. The collected effluents were subjected to determine the labile Zn, Cu, Cd and Ni concentrations using Empore TM chelating disk cartridge. It was observed that more than 55% of the dissolved metals were strongly complexed by ligands in the effluents. In addition, the Zn, Cu and Cd titration data obtained by square wave anodic stripping voltammetry were interpreted with Scatchard linearization to determine the conditional stability constant and the total binding site concentrations of DOM in three of the WWTP effluents. The titration data for Zn and Cu fitted to a two-ligand system while Cd data represented a one-ligand system. The conditional stability constant for Cu was greater than that for Zn with DOM in WWTP effluents. Zinc complexation parameters in natural organic matter (river water DOM and Suwanee River humic substances) were also compared with those of DOM in WWTP effluents. The results demonstrated higher stability constant and higher binding site concentrations for the DOM in WWTP effluents than the natural organic matter.

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“…1. Full data set is shown for the comparison even though the Zn and Cu results for WWTP 2 in August, November and January have already been reported elsewhere (Chaminda et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Section: Determination Of Total Dissolved and Labile Metal Concentratmentioning

confidence: 99%

Metal (Zn, Cu, Cd and Ni) Complexation by Dissolved Organic Matter (DOM) in Wastewater Treatment Plant Effluent

Chaminda

Nakajima

Furumai

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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“…Specific UV absorbance is defined as the UV 254 divided by the DOC concentration. Dissolved Zn and labile Zn concentrations were analyzed by an ICP-MS (HP 4500, Yokogawa, Japan), in accordance with the methods described by Chaminda et al (2008). The labile Zn was operationally defined by fractionation using a chelating disk cartridge (Empore) (Chaminda et al, 2008).…”

Section: Biodegradation Experimentsmentioning

confidence: 99%

“…The chemical structure of DOM, which originated from biological wastewater treatment plant, is much complicated and includes organic compounds in different groups (Ma et al, 2001). Recent studies have revealed that DOM in treated effluent tends to bind with many metals (eg; Zn and Cu) to a greater degree than natural organic matter (NOM) does (Sarathy and Allen., 2005;Cheng and Allen., 2006;Chaminda et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Biological Alteration of Zinc Complexation Characteristics of Dissolved Organic Matter in Domestic Wastewater Treatment Plant Effluent under River Water Environment

Nakajima

Kasuga

2010

J. of Wat. & Envir. Tech.

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Naturally occurring processes such as biological reaction might modify the properties of dissolved organic matter (DOM) for binding with heavy metals. Complexation of heavy metals with DOM determines their environmental and ecological impacts. In this study, biodegradation experiments were carried out separately for river water and river water spiked with DOM in wastewater treatment plant (WWTP) effluent to evaluate the biological alteration of zinc complexation characteristics of DOM under river water environment. Zinc complexation parameters, conditional stability constant and binding site concentrations were determined using anodic stripping voltammetry with Scatchard linearization. Total ambient zinc binding site concentration of river water DOM was reduced from 410 nM to 74 nM (82% decline) during two weeks of incubation. Compared to the river water DOM, 1-month incubation of DOM in WWTP effluent under the river water environment, showed only 22% decline in total ambient Zn binding sites. On the other hand, conditional stability constants, for Zn binding sites of DOM from WWTP effluent, did not vary during 1 month of incubation. The result suggests that metal (Zn) binding sites of DOM from WWTP effluents are biologically persistent in the urban river water environment.

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“…Previous studies have shown that wastewater effluent ligands are capable of binding trace elements present in the matrix to a greater degree than naturally derived DOC from, for example, standard Suwannee River humic and fulvic acids (Chaminda et al 2008, 2013) or that derived from road runoff (Chaminda et al 2010). Furthermore, effluent-derived DOC has been shown to be different in form compared to DOC derived from natural sources.…”

Section: Introductionmentioning

confidence: 99%

The effect of wastewater effluent derived ligands on copper and zinc complexation

Constantino

Comber

Scrimshaw

2017

Environ Sci Pollut Res

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The shift toward bioavailability-based standards for metals such as copper and zinc not only improves the ecological relevance of the standard but also introduces significant complexity into assessing compliance. This study examined differences in the copper and zinc complexation characteristics of effluents from a range of different sewage treatment works and in relation to so-called ‘natural’ samples. This information is essential to determine whether the inclusion of effluent-specific complexation characteristics within the regulatory framework could enhance the environmental relevance of compliance criteria. The data show that for copper, binding affinity was not greater than that measured for materials derived from the receiving water environment, with a mean log K of between 4.4 and 5.15 and mean complexation capacity ranging from 38 to 120 μg/mg dissolved organic carbon (DOC) for effluents compared with a log K of 5.6 and complexation capacity of 37 μg/mg DOC for the Suwannee River fulvic acid. For zinc, however, effluents exhibited a much higher complexation capacity, with effluent means ranging from 3 to 23 μg/mg DOC compared with the Suwannee River fulvic acid, for which the complexation capacity could not be determined. Synthetic ligands in sewage effluent, such as ethylenediaminetetraacetic acid (EDTA), are implicated as contributing to these observed differences. This suggests that the current biotic ligand models for zinc might overstate the risk of harm in effluent-impacted waters. The data also show that the copper and zinc complexation characteristics of effluent samples obtained from the same sewage treatment works were less different from one another than those of effluents from other treatment works and therefore that sewage source has an important influence on complexation characteristics. The findings from this study support the case that the contribution to complexation from effluent-derived ligands could enhance the environmental relevance of bioavailability-based compliance criteria, in particular for zinc, owing to the additional complexation capacity afforded by effluent-derived ligands.

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Heavy metal (Zn and Cu) complexation and molecular size distribution in wastewater treatment plant effluent

Cited by 13 publications

References 8 publications

Metal (Zn, Cu, Cd and Ni) Complexation by Dissolved Organic Matter (DOM) in Wastewater Treatment Plant Effluent

Metal (Zn, Cu, Cd and Ni) Complexation by Dissolved Organic Matter (DOM) in Wastewater Treatment Plant Effluent

Biological Alteration of Zinc Complexation Characteristics of Dissolved Organic Matter in Domestic Wastewater Treatment Plant Effluent under River Water Environment

The effect of wastewater effluent derived ligands on copper and zinc complexation

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