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

Huang, Diying; Li, Zhuang; Cao, Weidong; Xu, Wujie; Zhou, Shungui; Li, Fangbai

doi:10.1007/s11368-009-0161-2

Cited by 33 publications

(11 citation statements)

References 40 publications

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“…In three continuous cycles, both the EDC and EAC reached constant values, suggesting that the electron transfer in the DOM was reversible. These results also indicated that the electron transfer of DOM could be recycled, which is similar to the results of previous studies conducted to the evaluate reversible ETC of DOM determined with iron-reducing strains/iron complex coupled redox systems (Huang et al 2010) and humic acid with an electrochemistry oxygen coupled redox system (Aeschbacher et al 2010). …”

Section: Reversibility Of Electron Transfer To and From Domsupporting

confidence: 89%

“…The sewage sludge was composted and the DOM was extracted as previously reported by Huang et al (2010). The detailed DOM extraction procedures were as follows: DOM were extracted with double-distilled water by preparing the compost with a solid/water ratio of 1:5 (w/v, dry weight basis) and then shaking the samples at 200 rpm in a reciprocal shaker for 16 h at 20°C.…”

Section: Extraction Of Dommentioning

confidence: 99%

“…As mentioned in the introduction, chemical measurements are usually time-and laborintensive processes. For example, it normally takes more than 24 h to reduce DOM by using Zn (Blodau et al 2009;Huang et al 2010). However, these measurements could be determined in tens of seconds by using CA, which greatly saved assay time.…”

Section: Chronoamperometric Determination Of Eacmentioning

confidence: 99%

“…Meanwhile, other studies have indirectly determined the EAC by measuring the differences in EDCs of a microbial or chemically prereduced DOM and a nontreated DOM (Scott et al 1998;Kappler and Haderlei 2003). The EDC of DOM was usually indirectly determined by quantifying the amount of iron (II) formed by the reduction of added iron (III; Huang et al 2010). Although widely used, the above methods are usually time consuming and inaccurate because of the slow reaction rates of DOM with Zn or iron (III), the indirect determination of EAC and EDC, and the side reactions caused by the complexation of added metal ions with the DOM.…”

Section: Introductionmentioning

confidence: 99%

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A rapid and simple electrochemical method for evaluating the electron transfer capacities of dissolved organic matter

Yuan

Zhou

et al. 2011

J Soils Sediments

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Purpose The evaluation of the electron transfer capacities (ETC) of DOM is important to understand their roles in microbial activity, pollution degradation, and metal mobility. Those currently used methods to quantify ETC, such as Zn and Fe 3+ assays, are normally time consuming and usually require experience and skills to achieve reproducible results. The aim of this paper is to develop a rapid and simple approach to accurately and directly quantify the ETC of DOM. Materials and methods DOM was extracted from sewage sludge compost. Cycle voltammetry (CV) was used to investigate the redox behavior of DOM derived from sludge compost. Chronoamperometry (CA) was employed to study the electron-accepting capacities (EAC) and electrondonating capacities (EDC) by applying fixed positive or negative potentials to a working electrode in a conventional three-electrode cell. For comparison, the EAC and EDC of DOM were also determined by chemical methods using Zn as the reductant and Fe 3+ as the oxidant. The reversible electron transfer of DOM was studied electrochemically by CA with a multi-potential step technique. Results and discussionThe CV of sludge DOM displayed that a couple of quasi-reversible redox peaks with a formal potential of -0.866 V (vs. Ag/AgCl), demonstrating that the DOM was capable of reversibly transferring electrons. The value of EAC was determined by CA to be 361.6 μmol e− (g C) −1 at a potential of −0.6 V (vs. Ag/AgCl), and the value of initial EDC was 5.0 μmol e− (g C) −1 at a potential of +0.4 V (vs. Ag/AgCl). Both the values of EAC and EDC depended on the applied potentials on the working electrode. The results determined by the proposed method were comparable with those by using chemical methods. Conclusions A rapid electrochemical approach was employed to investigate the EAC and EDC of DOM extracted from sewage sludge compost. The acquired values of EAC and EDC were comparable with those measured by chemical methods using zinc as the reductant and ferric iron as the oxidant. The determination could be completed in tens of seconds, which was faster and more direct than conventional chemical methods.

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Section: Reversibility Of Electron Transfer To and From Domsupporting

confidence: 89%

Section: Extraction Of Dommentioning

confidence: 99%

Section: Chronoamperometric Determination Of Eacmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A rapid and simple electrochemical method for evaluating the electron transfer capacities of dissolved organic matter

Yuan

Zhou

et al. 2011

J Soils Sediments

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“…Humic substance can also be electron acceptors of anaerobic respiration (Scott et al 1998). Humic substances can accept electrons from anaerobic microorganisms and transfer them to solid Fe(III) minerals, facilitating microbial Fe(III) reduction (Newman and Kolter 2000;Huang et al 2010). Not only dissolved but also particulate humic substances have shown an electron transfer capability (Roden et al 2010).…”

Section: Thermodynamic Energymentioning

confidence: 99%

Thermodynamic energy of anaerobic microbial redox reactions couples elemental biogeochemical cycles

2017

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Purpose The thermodynamic energy of redox reactions affects the distribution of microbial redox reactions and cyclic transformation of elements in various anaerobic ecosystems. The principle of thermodynamics is of dramatic significance in understanding the energetics of metabolic processes, the biogeochemical behavior of microorganisms, and mass and energy cycles. The purpose of this paper is to relate the distribution of the coupling reactions between C, N, Fe, and S, the most important elements involved in microbially mediated redox reactions, with their thermodynamic feasibility to provide theoretical foundation of their occurrence. Results and discussion Anaerobic microorganisms catalyze diverse redox reactions in anoxic environments, driving elemental biogeochemical cycles on the earth. They capture energy from catalyzing these redox reactions in order to support life. The thermodynamic feasibility of these microbe-driven redox reactions is controlled by their energy yields which depend on environmental conditions. Anaerobic microorganisms can oxidize organic carbon with diverse inorganic compounds including nitrate/nitrite, ferric iron, and sulfate as electron acceptors in various anoxic environments which is referred to anaerobic respiration of organic matter; reversely, inorganic carbon can be reduced to synthesize cell material with ferrous iron and sulfide as an alternative electron donor by phototrophs under different sets of circumstances. Nitrate/nitrate can be microbically reduced by inorganic compounds such as ferrous iron and sulfide under some specific situations; the coupling of anaerobic anammox oxidation and reduction of nitrite (anammox), ferric iron (feammox), and sulfate (suramox) driven by anaerobes occurs in other particular systems. Conclusions and perspectives Although there are increasing researches investigating the anaerobe-driven coupling of pairs of elements such as C-N, C-Fe, C-S, N-Fe, N-S, and Fe-S, much more intricate situations associating the coupling of multiple elements are still not comprehensively understood. A great many reactions which are thermodynamically feasible have not yet been identified in natural environments or laboratories. Further work focusing on the metabolic pathways from a genetic and enzymatic perspective and the factors controlling the feasibility of the reactions by using updated technical tools and methods is required.

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Effects of Dissolved Organic Matter on the Bioavailability of Heavy Metals During Microbial Dissimilatory Iron Reduction: A Review

Gong

2021

Reviews of Environmental Contamination and Toxicology Volume 257

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

Cited by 33 publications

References 40 publications

A rapid and simple electrochemical method for evaluating the electron transfer capacities of dissolved organic matter

A rapid and simple electrochemical method for evaluating the electron transfer capacities of dissolved organic matter

Thermodynamic energy of anaerobic microbial redox reactions couples elemental biogeochemical cycles

Effects of Dissolved Organic Matter on the Bioavailability of Heavy Metals During Microbial Dissimilatory Iron Reduction: A Review

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