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

Graciela Gonzalez-Gil; Sílvia I C Lopes; Pascal Saikaly; Piet Nl L Lens

doi:10.1016/j.biortech.2012.09.044

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

Graciela Gonzalez-Gil, Sílvia I C Lopes, Pascal Saikaly, Piet Nl L Lens

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

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 (4gCODl reactor -1d -1) and sulfate at different COD/SO 4 2- 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 1year without supplementation of trace elements and no significant sludge wash-out occurred. © 2012 Elsevier Ltd.

Original language	English (US)
Pages (from-to)	238-246
Number of pages	9
Journal	Bioresource Technology
Volume	126
DOIs	https://doi.org/10.1016/j.biortech.2012.09.044
State	Published - Dec 2012

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was partially funded by a Ph.D. grant from the Fundacao para a Ciencia e Tecnologia, Portugal (SFRH/BD/9268/2002) and by a Global Collaborative Research award from King Abdullah University of Science and Technology, Saudi Arabia (GRP-CF-2011-13-P). We thank Ricardo Sampaio for contributing to the operation of the bioreactors.

ASJC Scopus subject areas

Bioengineering
Environmental Engineering
Waste Management and Disposal

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10.1016/j.biortech.2012.09.044

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

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 (4gCODl reactor -1d -1) and sulfate at different COD/SO 4 2- 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 1year without supplementation of trace elements and no significant sludge wash-out occurred. {\textcopyright} 2012 Elsevier Ltd.",

author = "Graciela Gonzalez-Gil and Lopes, {S{\'i}lvia I C} and Pascal Saikaly and Lens, {Piet Nl L}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was partially funded by a Ph.D. grant from the Fundacao para a Ciencia e Tecnologia, Portugal (SFRH/BD/9268/2002) and by a Global Collaborative Research award from King Abdullah University of Science and Technology, Saudi Arabia (GRP-CF-2011-13-P). We thank Ricardo Sampaio for contributing to the operation of the bioreactors.",

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AU - Lens, Piet Nl L

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was partially funded by a Ph.D. grant from the Fundacao para a Ciencia e Tecnologia, Portugal (SFRH/BD/9268/2002) and by a Global Collaborative Research award from King Abdullah University of Science and Technology, Saudi Arabia (GRP-CF-2011-13-P). We thank Ricardo Sampaio for contributing to the operation of the bioreactors.

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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 (4gCODl reactor -1d -1) and sulfate at different COD/SO 4 2- 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 1year without supplementation of trace elements and no significant sludge wash-out occurred. © 2012 Elsevier Ltd.

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

Abstract

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