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https://hdl.handle.net/2440/82955
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Type: | Journal article |
Title: | Effects of chemical amendments on the lability and speciation of metals in anaerobically digested biosolids |
Author: | Donner, E. Brunetti, G. Zarcinas, B. Harris, P. Tavakkoli, E. Naidu, R. Lombi, E. |
Citation: | Environmental Science and Technology (Washington), 2013; 47(19):11157-11165 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2013 |
ISSN: | 0013-936X 1520-5851 |
Statement of Responsibility: | Erica Donner, Gianluca Brunetti, Bernie Zarcinas, Paul Harris, Ehsan Tavakkoli, Ravi Naidu and Enzo Lombi |
Abstract: | The interaction of inorganic contaminants present in biosolids with iron, aluminum, and manganese oxy/hydroxides has been advocated as a key mechanism limiting their bioavailability. In this study, we investigated whether this is indeed the case, and further, whether it can be exploited to produce optimized biosolids products through the addition of chemical additives during sewage sludge processing. Experiments were conducted to investigate whether the addition of iron- and aluminum-based amendments (at 5 different rates) during the anaerobic digestion phase of wastewater treatment can effectively change the speciation or lability of contaminant metals (copper, zinc and cadmium) in biosolids destined for use in agriculture. The performance of the bioreactors was monitored throughout and the speciation and lability were determined in both fresh and 3-month aged biosolids using X-ray absorption spectroscopy (Cu, Zn) and isotopic dilution (65Cu, 65Zn, 109Cd). The tested amendments (FeCl3, Al2(SO4)3, and Al-rich water treatment residual) did not cause significant changes in metal speciation and were of limited use for reducing the lability of contaminant metals in good quality biosolids (suitable for use in agriculture), suggesting that high affinity binding sites were already in excess in these materials. However, the use of chemical amendments may offer advantages in terms of treatment process optimization and may also be beneficial when biosolids are used for contaminated site remediation. |
Keywords: | Bacteria Alum Compounds Chlorides Ferric Compounds Metals Bioreactors Sewage Waste Disposal, Fluid Anaerobiosis |
Rights: | © 2013 American Chemical Society |
DOI: | 10.1021/es400805j |
Published version: | http://dx.doi.org/10.1021/es400805j |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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