Fluidized-bed denitrification of mining water tolerates high nickel concentrations
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Fluidized-bed denitrification of mining water tolerates high nickel concentrations. / Zou, G.; Papirio, S.; van Hullebusch, E. D.; Puhakka, J. A.
julkaisussa: Bioresource Technology, Vuosikerta 179, 01.03.2015, s. 284-290.Tutkimustuotos › › vertaisarvioitu
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T1 - Fluidized-bed denitrification of mining water tolerates high nickel concentrations
AU - Zou, G.
AU - Papirio, S.
AU - van Hullebusch, E. D.
AU - Puhakka, J. A.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - This study revealed that fluidized-bed denitrifying cultures tolerated soluble Ni concentrations up to 500mg/L at 7-8 and 22°C. From 10 to 40mg/L of feed Ni, denitrification resulted in complete nitrate and nitrite removal. The concomitant reduction of 30mg/L of sulfate produced 10mg/L of sulfide that precipitated nickel, resulting in soluble effluent Ni below 22mg/L. At this stage, Dechloromonas species were the dominant denitrifying bacteria. From 60 to 500mg/L of feed Ni, nickel remained in solution due to the inhibition of sulfate reduction. At soluble 60mg/L of Ni, denitrification was partially inhibited prior to recover after 34days of enrichment by other Ni-tolerant species (including Delftia, Zoogloea and Azospira) that supported Dechloromonas. Subsequently, the FBR cultures completely removed nitrate even at 500mg/L of Ni. Visual Minteq speciation model predicted the formation of NiS, NiCO3 and Ni3(PO4)2, whilst only Ni3(PO4)2 was detected by XRD.
AB - This study revealed that fluidized-bed denitrifying cultures tolerated soluble Ni concentrations up to 500mg/L at 7-8 and 22°C. From 10 to 40mg/L of feed Ni, denitrification resulted in complete nitrate and nitrite removal. The concomitant reduction of 30mg/L of sulfate produced 10mg/L of sulfide that precipitated nickel, resulting in soluble effluent Ni below 22mg/L. At this stage, Dechloromonas species were the dominant denitrifying bacteria. From 60 to 500mg/L of feed Ni, nickel remained in solution due to the inhibition of sulfate reduction. At soluble 60mg/L of Ni, denitrification was partially inhibited prior to recover after 34days of enrichment by other Ni-tolerant species (including Delftia, Zoogloea and Azospira) that supported Dechloromonas. Subsequently, the FBR cultures completely removed nitrate even at 500mg/L of Ni. Visual Minteq speciation model predicted the formation of NiS, NiCO3 and Ni3(PO4)2, whilst only Ni3(PO4)2 was detected by XRD.
KW - Denitrification
KW - Denitrifying communities
KW - Fluidized-bed reactor
KW - Nickel
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=84919934975&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2014.12.044
DO - 10.1016/j.biortech.2014.12.044
M3 - Article
VL - 179
SP - 284
EP - 290
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -