liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Chemical Speciation of Sulfur and Metals in Biogas Reactors - Implications for Cobalt and Nickel Bio-uptake Processes
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Umeå, Sweden.
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Show others and affiliations
2016 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, Vol. xx, no xx, xx-xx p.Article in journal (Refereed) In press
Abstract [en]

This article deals with the interrelationship between overall chemical speciation of S, Fe, Co, and Ni in relation to metals bio-uptake processes in continuous stirred tank biogas reactors (CSTBR). To address this topic, laboratory CSTBRs digesting sulfur(S)-rich stillage, as well as full-scale CSTBRs treating sewage sludge and various combinations of organic wastes, termed co-digestion, were targeted. Sulfur speciation was evaluated using acid volatile sulfide extraction and X-ray absorption spectroscopy. Metal speciation was evaluated by chemical fractionation, kinetic and thermodynamic analyses. Relative Fe to S content is identified as a critical factor for chemical speciation and bio-uptake of metals. In reactors treating sewage sludge, quantity of Fe exceeds that of S, inducing Fe-dominated conditions, while sulfide dominates in laboratory and co-digestion reactors due to an excess of S over Fe. Under sulfide-dominated conditions, metals availability for microorganisms is restricted due to formation of metal-sulfide precipitates. However, aqueous concentrations of different Co and Ni species were shown to be sufficient to support metal acquisition by microorganisms under sulfidic conditions. Concentrations of free metal ions and labile metal complexes in aqueous phase, which directly participate in bio-uptake processes, are higher under Fe-dominated conditions. This in turn enhances metal adsorption on cell surfaces and bio-uptake rates.

Place, publisher, year, edition, pages
2016. Vol. xx, no xx, xx-xx p.
Keyword [en]
Biogas, Chemical, speciation, Bio-uptake, Sulfur, Iron Cobalt, Nickela
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-127149DOI: 10.1016/j.jhazmat.2015.12.058OAI: oai:DiVA.org:liu-127149DiVA: diva2:919792
Available from: 2016-04-15 Created: 2016-04-15 Last updated: 2016-04-29

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Shakeri Yekta, SepehrDanielsson, ÅsaBjörn, AnnikaSvensson, Bo H.
By organisation
Tema Environmental ChangeFaculty of Arts and Sciences
Analytical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 172 hits
ReferencesLink to record
Permanent link

Direct link