Sequential removal of selenate, nitrate and sulfate and recovery of elemental selenium in a multi-stage bioreactor process with redox potential feedback control

S. Yan; K.Y. Cheng; M.P. Ginige; C. Morris; X. Deng; J. Li; S. Song; G. Zheng; L. Zhou; A.H. Kaksonen

doi:10.1016/j.jhazmat.2021.127539

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Sequential removal of selenate, nitrate and sulfate and recovery of elemental selenium in a multi-stage bioreactor process with redox potential feedback control

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Sequential removal of selenate, nitrate and sulfate and recovery of elemental selenium in a multi-stage bioreactor process with redox potential feedback control

S. Yan, K.Y. Cheng, M.P. Ginige, C. Morris, X. Deng, J. Li, S. Song, G. Zheng, L. Zhou and A.H. Kaksonen

Journal of Hazardous Materials, Vol.424, Art. 127539

2022

DOI: https://doi.org/10.1016/j.jhazmat.2021.127539

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Abstract

Bioreduction can facilitate oxyanions removal from wastewater. However, simultaneously removing selenate, nitrate and sulfate and recovering high-purity elemental selenium (Se0) from wastewater by a single system is difficult and may lead to carcinogenic selenium monosulfide (SeS) formation. To solve this issue, a two-stage biological fluidized bed (FBR) process with ethanol dosing based on oxidation-reduction potential (ORP) feedback control was developed in this study. FBR1 performance was first evaluated at various ORP setpoints (between −520 and −360 mV vs. Ag/AgCl) and elevated sulfate concentration. Subsequently, ethanol-fed FBR2 was used to reduce sulfate from FBR1 effluent, followed by an aerated sulfide oxidation reactor (SOR). At − 520 mV ≤ ORPs ≤ − 480 mV, FBR1 removed 100 ± 0.1% nitrate and 99.7 ± 0.3% selenate without sulfate reduction. At ORPs ≥ − 440 mV, selenate reduction was incomplete, whereas nitrate removal remained stable. Se0 recovery efficiency from FBR1 effluent was 37.5% with 71% Se purity. FBR2 converted 86% of the remaining sulfate in FBR1 effluent to hydrogen sulfide, but the over-oxidation of dissolved sulfide in SOR decreased the overall sulfate removal efficiency to ~46.3%. Overall, the two-stage FBR process with ORP feedback dosing of ethanol was effective for sequentially removing selenate, nitrate and sulfate and recovering Se0 from wastewater.

Details

Title: Sequential removal of selenate, nitrate and sulfate and recovery of elemental selenium in a multi-stage bioreactor process with redox potential feedback control
Authors/Creators: S. Yan (Author/Creator) - Nanjing Tech University
K.Y. Cheng (Author/Creator) - CSIRO Land and Water
M.P. Ginige (Author/Creator) - CSIRO Land and Water
C. Morris (Author/Creator) - CSIRO Land and Water
X. Deng (Author/Creator) - National Institute for Materials Science
J. Li (Author/Creator) - Australian Resources Research Centre
S. Song (Author/Creator) - CSIRO Land and Water
G. Zheng (Author/Creator) - Nanjing Agricultural University
L. Zhou (Author/Creator) - Nanjing Agricultural University
A.H. Kaksonen (Author/Creator) - CSIRO Land and Water
Publication Details: Journal of Hazardous Materials, Vol.424, Art. 127539
Publisher: Elsevier BV
Identifiers: 991005541599007891
Murdoch Affiliation: School of Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.91 Contamination & Phytoremediation; 3.91.920 Selenium
Web Of Science research areas: Engineering, Environmental; Environmental Sciences
ESI research areas: Engineering