NDLI: Comparison of dissolved organic matter from sewage sludge and sludge compost as electron shuttles for enhancing Fe(III) bioreduction

Content Provider	Springer Nature Link
Author	Huang, De Yin Zhuang, Li Cao, Wei Dong Xu, Wei Zhou, Shun Gui Li, Fang Bai
Copyright Year	2009
Abstract	Land utilization of sewage sludge and sludge compost is a common practice in many countries. Soils amended with sewage sludge and sludge compost display different physicochemical properties, especially in terms of dissolved organic matter (DOM) composition that affects the electron-donating capacity (EDC) of DOM in soils. The aim of this paper was to compare the EDC of DOM derived from sewage sludge and sludge compost for enhancing Fe(III) bioreduction. It is expected that this research could be helpful for further understanding of soil remediation in the future.Sludge and compost DOM were extracted from sewage sludge and sludge compost, respectively. Fractionation, CHNO/S analysis, Fourier-transform infrared and ultraviolet-visible spectroscopy, and cyclic voltammetry were then used to determine the degree of aromaticity and humification in the samples. To determine if their EDC was altered during composting, samples were reduced by the humic-reducing bacterium, Shewanella cinica D14$^{T}$, after which their EDC values were determined. The initial and potential EDC values of the samples were measured using FeCl$_{3}$/Fe(citrate) as an electron acceptor. The insoluble Fe(III) oxide reduction by strain D14$^{T}$ was mediated by DOM.Both sludge and compost DOM contained redox-active functional groups that could shuttle electrons to insoluble Fe(III) oxide and accelerate Fe(III) bioreduction. When FeCl$_{3}$ was used as an oxidizing agent, their potential EDC reached 0.25 and 0.50 meq/(mg C), respectively. In addition, their electron transfer ability could be recycled.The degree of humification of DOM increased during sludge composting, which resulted in the EDC of compost DOM being greater than that of sludge DOM. Furthermore, the rate of Fe(III) bioreduction mediated by DOM could be accelerated under anaerobic conditions, which has important implications for soil biogeochemistry because it may accelerate the rate of some kinds of toxic metals and recalcitrant organic pollutants transformation or degradation.
Starting Page	722
Ending Page	729
Page Count	8
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	4
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved organic matter Electron shuttle Fe(III) bioreduction Humic-reducing bacteria Sewage sludge Sludge compost Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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