Effect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactors

Handle URI:
http://hdl.handle.net/10754/563395
Title:
Effect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactors
Authors:
Villa-Gómez, Denys Kristalia; Enright, Anne Marie; Rini, Eki Listya; Buttice, Audrey L.; Kramer, Herman J M; Lens, Piet Nl L
Abstract:
BACKGROUND: Metal sulfide recovery in sulfate reducing bioreactors is a challenge due to the formation of small precipitates with poor settling properties. The size of the metal sulfide precipitates with the change in operational parameters such as pH, sulfide concentration and reactor configuration has been previously studied. The effect of the hydraulic retention time (HRT) on the metal precipitate characteristics such as particle size for settling has not yet been addressed. RESULTS: The change in size of the metal (Cu, Zn, Pb and Cd) sulfide precipitates as a function of the HRT was studied in two sulfate reducing inversed fluidized bed (IFB) reactors operating at different chemical oxygen demand concentrations to produce high and low sulfide concentrations. The decrease of the HRT from 24 to 9h in both IFB reactors affected the contact time of the precipitates formed, thus making differences in aggregation and particle growth regardless of the differences in sulfide concentration. Further HRT decrease to 4.5h affected the sulfate reducing activity for sulfide production and hence, the supersaturation level and solid phase speciation. Metal sulfide precipitates affected the sulfate reducing activity and community in the biofilm, probably because of the stronger local supersaturation causing metal sulfides accumulation in the biofilm. CONCLUSIONS: This study shows that the HRT is an important factor determining the size and thus the settling rate of the metal sulfides formed in bioreactors.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Chemical and Biological Engineering Program
Publisher:
Wiley-Blackwell
Journal:
Journal of Chemical Technology & Biotechnology
Issue Date:
13-Feb-2014
DOI:
10.1002/jctb.4296
Type:
Article
ISSN:
02682575
Sponsors:
This research was supported financially by the National Council for Science and Technology, Mexico (CONACYT-192635). The authors would like to thank the laboratory staff (UNESCO-IHE), the Microbial Ecology Laboratory (National University of Ireland) and the Laboratory of Process and Energy (TU Delft) for the analytical support.
Appears in Collections:
Articles; Chemical and Biological Engineering Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorVilla-Gómez, Denys Kristaliaen
dc.contributor.authorEnright, Anne Marieen
dc.contributor.authorRini, Eki Listyaen
dc.contributor.authorButtice, Audrey L.en
dc.contributor.authorKramer, Herman J Men
dc.contributor.authorLens, Piet Nl Len
dc.date.accessioned2015-08-03T11:47:31Zen
dc.date.available2015-08-03T11:47:31Zen
dc.date.issued2014-02-13en
dc.identifier.issn02682575en
dc.identifier.doi10.1002/jctb.4296en
dc.identifier.urihttp://hdl.handle.net/10754/563395en
dc.description.abstractBACKGROUND: Metal sulfide recovery in sulfate reducing bioreactors is a challenge due to the formation of small precipitates with poor settling properties. The size of the metal sulfide precipitates with the change in operational parameters such as pH, sulfide concentration and reactor configuration has been previously studied. The effect of the hydraulic retention time (HRT) on the metal precipitate characteristics such as particle size for settling has not yet been addressed. RESULTS: The change in size of the metal (Cu, Zn, Pb and Cd) sulfide precipitates as a function of the HRT was studied in two sulfate reducing inversed fluidized bed (IFB) reactors operating at different chemical oxygen demand concentrations to produce high and low sulfide concentrations. The decrease of the HRT from 24 to 9h in both IFB reactors affected the contact time of the precipitates formed, thus making differences in aggregation and particle growth regardless of the differences in sulfide concentration. Further HRT decrease to 4.5h affected the sulfate reducing activity for sulfide production and hence, the supersaturation level and solid phase speciation. Metal sulfide precipitates affected the sulfate reducing activity and community in the biofilm, probably because of the stronger local supersaturation causing metal sulfides accumulation in the biofilm. CONCLUSIONS: This study shows that the HRT is an important factor determining the size and thus the settling rate of the metal sulfides formed in bioreactors.en
dc.description.sponsorshipThis research was supported financially by the National Council for Science and Technology, Mexico (CONACYT-192635). The authors would like to thank the laboratory staff (UNESCO-IHE), the Microbial Ecology Laboratory (National University of Ireland) and the Laboratory of Process and Energy (TU Delft) for the analytical support.en
dc.publisherWiley-Blackwellen
dc.subjectBiofilmen
dc.subjectMetalsen
dc.subjectSulfate reducing reactoren
dc.subjectSulfideen
dc.titleEffect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactorsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentChemical and Biological Engineering Programen
dc.identifier.journalJournal of Chemical Technology & Biotechnologyen
dc.contributor.institutionChair group Pollution Prevention and Resource Recovery, UNESCO-IHE, Institute for Water Education, PO Box 3015Delft, Netherlandsen
dc.contributor.institutionMicrobial Ecology Laboratory, Department of Microbiology and Environmental Change Institute (ECI), National University of Ireland, Galway (NUI, Galway), University RoadGalway, Irelanden
dc.contributor.institutionDepartment of Civil and Environmental Engineering, University of South Florida, 4202 E. Fowler Ave, ENB 118Tampa, FL, United Statesen
dc.contributor.institutionLaboratory of Process and Energy, University of Technology, Leeghwaterstraat 44Delft, Netherlandsen
kaust.authorRini, Eki Listyaen
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