Leaching and accumulation of trace elements in sulfate reducing granular sludge under concomitant thermophilic and low pH conditions

G. Gonzalez-Gil, S.I.C. Lopes, P.E. Saikaly, P.N.L. Lens

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

The leaching and/or accumulation of trace elements in sulfate reducing granular sludge systems was investigated. Two thermophilic up-flow anaerobic sludge bed (UASB) reactors operated at pH 5 were fed with sucrose (4 g COD l(reactor)(-1) d(-1)) and sulfate at different COD/SO42- ratios. During the start-up of such acidogenic systems, an initial leaching of trace elements from the inoculum sludge occurred regardless of trace elements supplementation in the reactor influent. The granular sludge maintained the physical structure despite high Fe leaching. After start-up and nonetheless the acidic conditions, Co, Ni, Cu, Zn, Mo and Se were retained or accumulated by the sludge when added. Particularly, Ni and Co accumulated in the carbonates and exchangeable fractions ensuring potential bioavailability. Otherwise, the initial stock in the inoculum sludge sufficed to operate the process for nearly I year without supplementation of trace elements and no significant sludge wash-out occurred.
Original languageEnglish
Pages (from-to)238-246
JournalBioresource Technology
Volume126
DOIs
Publication statusPublished - 2012

Fingerprint

Trace Elements
Trace elements
Leaching
Sulfates
sludge
leaching
trace element
sulfate
Carbonates
Sugar (sucrose)
Sucrose
sucrose
bioavailability
carbonate
reactor

Keywords

  • anaerobic-digestion
  • uasb reactors
  • heavy-metals
  • bed reactor
  • bacteria
  • degradation
  • reduction
  • removal
  • media
  • water

Cite this

Gonzalez-Gil, G. ; Lopes, S.I.C. ; Saikaly, P.E. ; Lens, P.N.L. / Leaching and accumulation of trace elements in sulfate reducing granular sludge under concomitant thermophilic and low pH conditions. In: Bioresource Technology. 2012 ; Vol. 126. pp. 238-246.
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abstract = "The leaching and/or accumulation of trace elements in sulfate reducing granular sludge systems was investigated. Two thermophilic up-flow anaerobic sludge bed (UASB) reactors operated at pH 5 were fed with sucrose (4 g COD l(reactor)(-1) d(-1)) and sulfate at different COD/SO42- ratios. During the start-up of such acidogenic systems, an initial leaching of trace elements from the inoculum sludge occurred regardless of trace elements supplementation in the reactor influent. The granular sludge maintained the physical structure despite high Fe leaching. After start-up and nonetheless the acidic conditions, Co, Ni, Cu, Zn, Mo and Se were retained or accumulated by the sludge when added. Particularly, Ni and Co accumulated in the carbonates and exchangeable fractions ensuring potential bioavailability. Otherwise, the initial stock in the inoculum sludge sufficed to operate the process for nearly I year without supplementation of trace elements and no significant sludge wash-out occurred.",
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Leaching and accumulation of trace elements in sulfate reducing granular sludge under concomitant thermophilic and low pH conditions. / Gonzalez-Gil, G.; Lopes, S.I.C.; Saikaly, P.E.; Lens, P.N.L.

In: Bioresource Technology, Vol. 126, 2012, p. 238-246.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Leaching and accumulation of trace elements in sulfate reducing granular sludge under concomitant thermophilic and low pH conditions

AU - Gonzalez-Gil, G.

AU - Lopes, S.I.C.

AU - Saikaly, P.E.

AU - Lens, P.N.L.

N1 - WOS:000313997500035

PY - 2012

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N2 - The leaching and/or accumulation of trace elements in sulfate reducing granular sludge systems was investigated. Two thermophilic up-flow anaerobic sludge bed (UASB) reactors operated at pH 5 were fed with sucrose (4 g COD l(reactor)(-1) d(-1)) and sulfate at different COD/SO42- ratios. During the start-up of such acidogenic systems, an initial leaching of trace elements from the inoculum sludge occurred regardless of trace elements supplementation in the reactor influent. The granular sludge maintained the physical structure despite high Fe leaching. After start-up and nonetheless the acidic conditions, Co, Ni, Cu, Zn, Mo and Se were retained or accumulated by the sludge when added. Particularly, Ni and Co accumulated in the carbonates and exchangeable fractions ensuring potential bioavailability. Otherwise, the initial stock in the inoculum sludge sufficed to operate the process for nearly I year without supplementation of trace elements and no significant sludge wash-out occurred.

AB - The leaching and/or accumulation of trace elements in sulfate reducing granular sludge systems was investigated. Two thermophilic up-flow anaerobic sludge bed (UASB) reactors operated at pH 5 were fed with sucrose (4 g COD l(reactor)(-1) d(-1)) and sulfate at different COD/SO42- ratios. During the start-up of such acidogenic systems, an initial leaching of trace elements from the inoculum sludge occurred regardless of trace elements supplementation in the reactor influent. The granular sludge maintained the physical structure despite high Fe leaching. After start-up and nonetheless the acidic conditions, Co, Ni, Cu, Zn, Mo and Se were retained or accumulated by the sludge when added. Particularly, Ni and Co accumulated in the carbonates and exchangeable fractions ensuring potential bioavailability. Otherwise, the initial stock in the inoculum sludge sufficed to operate the process for nearly I year without supplementation of trace elements and no significant sludge wash-out occurred.

KW - anaerobic-digestion

KW - uasb reactors

KW - heavy-metals

KW - bed reactor

KW - bacteria

KW - degradation

KW - reduction

KW - removal

KW - media

KW - water

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JO - Bioresource Technology

JF - Bioresource Technology

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