Sulfate reduction in acetate- and ethanol-fed bioreactors: Acidic mine drainage treatment and selective metal recovery

Yıldız, Müjgan; Yılmaz, Tülay; Arzum, Cemile Seyma; Yurtsever, Adem; Kaksonen, Anna H.; Uçar, Deniz

doi:10.1016/j.mineng.2019.01.007

Cited by 27 publications

(15 citation statements)

References 20 publications

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“…2b), respectively, demonstrating that ethanol might be a more favorable carbon source for sulfate reduction. Similarly, previous studies reported that the sulfate reduction e ciency of an ethanol-fed reactor was higher than that of its acetate-fed counterpart (Xing et al 2020, Yildiz et al 2019). Additionally, the incomplete oxidation of ethanol (ΔG 0 = − 66.4 kJ/mol) provides more energy than the complete oxidation of acetate (ΔG 0 = − 47.6 kJ/mol) according to the Gibbs free energy calculation, demonstrating that using ethanol as a carbon source could enhance sulfate reduction e ciency (Thauer et al 1977).…”

Section: Microbial Community and Functional Gene Analysismentioning

confidence: 51%

Effect of different carbon sources on sulfate reduction and microbial community structure in bioelectrochemical systems

Pan

Tan

Fan

et al. 2022

Environ Sci Pollut Res

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Microbial electrolysis cells (MECs) have rapidly developed into a promising technology to treat sulfaterich wastewater that lacks electron donors. However, little is known regarding the effect of different carbon sources on the microbial community structure bioelectrochemical systems. This study sought to investigate the effect of different carbon sources (NaHCO 3 , ethanol, and acetate were employed as sole carbon source respectively) on the performance of sulfate-reducing biocathodes. The sulfate reduction e ciency enhanced by the bioelectrochemical systems was 8.09%−11.57% higher than that of opencircuit reference experiments. Furthermore, the optimum carbon source was ethanol with a maximum sulfate reduction rate of 170 mg L −1 d −1 in the bioelectrochemical systems. The different carbon sources induced signi cant differences in sulfate reduction e ciency as demonstrated by the application of a micro-electrical eld. The dominant sulfate-reducing bacteria that use NaHCO 3 and acetate as carbon sources were Desulfobacter and Desulfobulbus, whereas those that use ethanol as carbon source were Desulfomicrobium and Desulfovibrio. Our results suggest that ethanol is a more suitable carbon source for sulfate reduction in bioelectrochemical systems.

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Section: Microbial Community and Functional Gene Analysismentioning

confidence: 51%

Effect of different carbon sources on sulfate reduction and microbial community structure in bioelectrochemical systems

Pan

Tan

Fan

et al. 2022

Environ Sci Pollut Res

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“…This degree of performance has been seen in other studies using acetate as an electron donor ( Omil et al, 1997 ). Yildiz et al (2019) reported similar sulfate conversions using acetate as the electron donor in a UAPBR but using 2 g/L sulfate, enabling this acetate reactor to achieve VSRR of up to 45.8 mg.L −1 . h −1 .…”

Section: Discussionmentioning

confidence: 81%

Integrated Kinetic Modelling and Microbial Profiling Provide Insights Into Biological Sulfate-Reducing Reactor Design and Operation

Hessler

Harrison

Huddy

2022

Front. Bioeng. Biotechnol.

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Biological sulfate reduction (BSR) is an attractive approach for the bioremediation of sulfate-rich wastewater streams. Many sulfate-reducing microorganisms (SRM), which facilitate this process, have been well-studied in pure culture. However, the role of individual members of microbial communities within BSR bioreactors remains understudied. In this study we investigated the performance of two up-flow anaerobic packed bed reactors (UAPBRs) supplemented primarily with acetate and with lactate, respectively, during a hydraulic retention time (HRT) study set up to remediate sulfate-rich synthetic wastewater over the course of 1,000 + days. Plug-flow hydrodynamics led to a continuum of changing volumetric sulfate reduction rates (VSRRs), available electron donors, degrees of biomass retention and compositions of microbial communities throughout these reactors. Microbial communities throughout the successive zones of the reactors were resolved using 16S rRNA gene amplicon sequencing which allowed the association of features of performance with discrete microorganisms. The acetate UAPBR achieved a maximum VSRR of 23.2 mg.L−1. h−1 at a one-day HRT and a maximum sulfate conversion of the 1 g/L sulfate of 96% at a four-day HRT. The sulfate reduction reactions in this reactor could be described with a reaction order of 2.9, an important observation for optimisation and future scale-up. The lactate UAPBR achieved a 96% sulfate conversion at one-day HRT, corresponding with a VSRR of 40.1 mg.L−1. h−1. Lactate was supplied in this reactor at relatively low concentrations necessitating the subsequent use of propionate and acetate, by-products of lactate fermentation with acetate also a by-product of incomplete lactate oxidation, to achieve competitive performance. The consumption of these electron donors could be associated with specific SRM localised within biofilms of discrete zones. The sulfate reduction rates in the lactate UAPBR could be modelled as first-order reactions, indicating effective rates were conferred by these propionate- and acetate-oxidising SRM. Our results demonstrate how acetate, a low-cost substrate, can be used effectively despite low associated SRM growth rates, and that lactate, a more expensive substrate, can be used sparingly to achieve high VSRR and sulfate conversions. We further identified the preferred environment of additional microorganisms to inform how these microorganisms could be enriched or diminished in BSR reactors.

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“…Two upflow bioreactors were used for sulfate reduction from AMD using acetate and ethanol as substrates (Yildiz et al, 2019). Copper precipitation occurred at low pH (<2) while nickel recovery took place at higher pH values (~8).…”

Section: Mine Drainage Remediation Technologymentioning

confidence: 99%

Mine drainage: Remediation technology and resource recovery

Viadero

Zhang

et al. 2020

Water Environment Research

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Drainage from current and historic mining operations remains a persistent environmental problem. Numerous research and development efforts were made in 2019 with a goal to minimize the impact of mine drainage on the environment, while other research endeavors addressed the mine drainage issue from a different perspective, where mine drainage was considered a resource for water and valuable products, such as metals, sulfuric acid, and rare earth elements. Thus, this review has two main sections: (a) focusing on research efforts in mine drainage remediation technology, and (b) emphasizing advances in resource recovery from mine drainage. The first section covers traditional and emerging passive and active treatment technologies. The second section summarizes resource recovery efforts using various technologies, such as selective precipitation, membrane process, and biological systems.

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Sulfate reduction in acetate- and ethanol-fed bioreactors: Acidic mine drainage treatment and selective metal recovery

Cited by 27 publications

References 20 publications

Effect of different carbon sources on sulfate reduction and microbial community structure in bioelectrochemical systems

Effect of different carbon sources on sulfate reduction and microbial community structure in bioelectrochemical systems

Integrated Kinetic Modelling and Microbial Profiling Provide Insights Into Biological Sulfate-Reducing Reactor Design and Operation

Mine drainage: Remediation technology and resource recovery

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