Bioprocess Engineering of Sulfate Reduction for Environmental Technology

Lens, P.N.L.; Meulepas, Roel J.W.; Sampaio, R.M.M.; Vallero, M.V.G.; Esposito, Giovanni

doi:10.1007/978-3-540-72682-1_22

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…In addition, it is low cost, applicable in low-metal concentration leachates, and it provides better settling. It is however more complex to operate compared to the chemical precipitation method [61]. Sulfate reduction by bacteria is a common method applied in heavy metal precipitation in this genre.…”

Section: Biological Precipitationmentioning

confidence: 99%

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Kinoti

Karanja

Nthiga

et al. 2022

Journal of Chemistry

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Due to rapid industrialization, urbanization, and surge in modern human activities, water contamination is a major threat to humanity globally. Contaminants ranging from organic compounds, dyes, to inorganic heavy metals have been of major concern in recent years. This necessitates the development of affordable water remediation technologies to improve water quality. There is a growing interest in nanotechnology recently because of its application in eco-friendly, cost-effective, and durable material production. This study presents a review of recent nanocomposite technologies based on clay, applied in the removal of heavy metals from wastewater, and highlights the shortcomings of existing methods. Recently published reports, articles, and papers on clay-based nanocomposites for the removal of heavy metals have been reviewed. Currently, the most common methods utilized in the removal of heavy metals are reverse osmosis, electrodialysis, ion exchange, and activated carbon. These methods, however, suffer major shortcomings such as inefficiency when trace amounts of contaminant are involved, uneconomical costs of operation and maintenance, and production of contaminated sludge. The abundance of clay on the Earth’s surface and the ease of modification to improve adsorption capabilities have made it a viable candidate for the synthesis of nanocomposites. Organoclay nanocomposites such as polyacrylamide-bentonite, polyaniline-montmorillonite, and β-cyclodextrin-bentonite have been synthesized for the selective removal of various heavy metals such as Cu2+, Co2+, among others. Bacterial clay nanocomposites such as E. coli kaolinite nanocomposites have also been successfully synthesized and applied in the removal of heavy metals. Low-cost nanocomposites of clay using biopolymers like chitosan and cellulose are especially in demand due to the cumulative abundance of these materials in the environment. A comparative analysis of different synthetic processes to efficiently remove heavy metal contaminants with clay-based nanocomposite adsorbents is made.

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Section: Biological Precipitationmentioning

confidence: 99%

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Kinoti

Karanja

Nthiga

et al. 2022

Journal of Chemistry

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“…The success of the precipitation process depends not only on the heavy metal removal from the soluble phase but also on its separation from the liquid phase. Thus, solid-liquid separation processes (for instance, sedimentation and filtration) are of great importance for a successful removal [55].…”

Section: Selective Precipitation Of Heavy Metalsmentioning

confidence: 99%

Removal of Heavy Metals from Aqueous Solutions by Aerobic and Anaerobic Biomass

Monge-Amaya¹,

Certucha-Barragán²,

Almendariz-Tapia³

et al. 2015

Biomass Production and Uses

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“…Their growth rates are usually slower than those of methanogenic microorganisms at high methanol concentrations, but SRMs have been reported to outcompete methanogens for methanol, where the environmental conditions such as methanol concentration or temperature seem more favorable for SRMs [10][11][12][13]. In methanol-fed bioreactors, stimulation of SRMs is particularly problematic because dissimilatory sulfate reduction accumulates toxic and corrosive hydrogen sulfide [14,15]. While a role for SRMs in methanol-containing environments has been shown, knowledge about their underlying physiology remains limited.…”

Section: Introductionmentioning

confidence: 99%

Physiological, genomic, and sulfur isotopic characterization of methanol metabolism by Desulfovibrio carbinolicus

2021

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Methanol is often considered as a non-competitive substrate for methanogenic archaea, but an increasing number of sulfate-reducing microorganisms (SRMs) have been reported to be capable of respiring with methanol as an electron donor. A better understanding of the fate of methanol in natural or artificial anaerobic systems thus requires knowledge of the methanol dissimilation by SRMs. In this study, we describe the growth kinetics and sulfur isotope effects of Desulfovibrio carbinolicus, a methanol-oxidizing sulfate-reducing deltaproteobacterium, together with its genome sequence and annotation. D. carbinolicus can grow with a series of alcohols from methanol to butanol. Compared to longer-chain alcohols, however, specific growth and respiration rates decrease by several fold with methanol as an electron donor. Larger sulfur isotope fractionation accompanies slowed growth kinetics, indicating low chemical potential at terminal reductive steps of respiration. In a medium containing both ethanol and methanol, D. carbinolicus does not consume methanol even after the cessation of growth on ethanol. Among the two known methanol dissimilatory systems, the genome of D. carbinolicus contains the genes coding for alcohol dehydrogenase but lacks enzymes analogous to methanol methyltransferase. We analyzed the genomes of 52 additional species of sulfate-reducing bacteria that have been tested for methanol oxidation. There is no apparent relationship between phylogeny and methanol metabolizing capacity, but most gram-negative methanol oxidizers grow poorly, and none carry homologs for methyltransferase (mtaB). Although the amount of available data is limited, it is notable that more than half of the known gram-positive methanol oxidizers have both enzymatic systems, showing enhanced growth relative to the SRMs containing only alcohol dehydrogenase genes. Thus, physiological, genomic, and sulfur isotopic results suggest that D. carbinolicus and close relatives have the ability to metabolize methanol but likely play a limited role in methanol degradation in most natural environments.

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Bioprocess Engineering of Sulfate Reduction for Environmental Technology

Cited by 7 publications

References 33 publications

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Removal of Heavy Metals from Aqueous Solutions by Aerobic and Anaerobic Biomass

Physiological, genomic, and sulfur isotopic characterization of methanol metabolism by Desulfovibrio carbinolicus

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