Stabilisation of microalgae: Iodine mobilisation under aerobic and anaerobic conditions

Han, Wei; Clarke, William P.; Pratt, Steven

doi:10.1016/j.biortech.2015.06.063

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Despite wide ecological distribution and the capability to produce RHS, VHC emissions by microalgae “are still poorly known” [ 86 ] and not well understood [ 80 ]. “Waste microalgae”, defined as algae from laboratory algal growth systems, underwent I 2 mobilization which was linearly correlated with carbon emission, suggesting the formation of organoiodine [ 87 ]. Arctic microalgae (predominantly pennate diatoms) were found to emit significant amounts of bromoform [ 76 ].…”

Section: In Vivo Microalgae Vocsmentioning

confidence: 99%

Volatile Metabolites Emission by In Vivo Microalgae—An Overlooked Opportunity?

et al. 2017

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Fragrances and malodors are ubiquitous in the environment, arising from natural and artificial processes, by the generation of volatile organic compounds (VOCs). Although VOCs constitute only a fraction of the metabolites produced by an organism, the detection of VOCs has a broad range of civilian, industrial, military, medical, and national security applications. The VOC metabolic profile of an organism has been referred to as its ‘volatilome’ (or ‘volatome’) and the study of volatilome/volatome is characterized as ‘volatilomics’, a relatively new category in the ‘omics’ arena. There is considerable literature on VOCs extracted destructively from microalgae for applications such as food, natural products chemistry, and biofuels. VOC emissions from living (in vivo) microalgae too are being increasingly appreciated as potential real-time indicators of the organism’s state of health (SoH) along with their contributions to the environment and ecology. This review summarizes VOC emissions from in vivo microalgae; tools and techniques for the collection, storage, transport, detection, and pattern analysis of VOC emissions; linking certain VOCs to biosynthetic/metabolic pathways; and the role of VOCs in microalgae growth, infochemical activities, predator-prey interactions, and general SoH.

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Section: In Vivo Microalgae Vocsmentioning

confidence: 99%

Volatile Metabolites Emission by In Vivo Microalgae—An Overlooked Opportunity?

et al. 2017

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“…A by-product of the anaerobic digestion process is a nutrient-rich digestate which can be used as a fertiliser for agriculture and thus decrease the use of energy-intensive mineral fertilisers [167]. For example, Han et al, [168] grew microalgae in iodine-rich groundwater (2.0 mg iodide L −1 ). The algae were stabilised in an anaerobic environment.…”

Section: Bioremediation As Part Of Refining Macroalgae For Biofuel Production and Its Challengesmentioning

confidence: 99%

“…Of the initial algae iodine concentration (0.35 ± 0.05 mg g −1 VS), 0.19 ± 0.01 mg g −1 VS remained in the solid phase in the anaerobic environment. The authors concluded that the stabilised material had potential to be used as an iodine-rich fertiliser but also noted that the iodine content of the stabilised material was five times higher than what has been reported to be an effective I-fertilisation dose [168]. Biomass for AD and the resulting digestate as part of a bioremediation process must, therefore, be carefully characterised prior to use.…”

Section: Bioremediation As Part Of Refining Macroalgae For Biofuel Production and Its Challengesmentioning

confidence: 99%

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

et al. 2020

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The urgent need to replace fossil fuels has seen macroalgae advancing as a potential feedstock for anaerobic digestion. The natural methane productivity (dry weight per hectare) of seaweeds is greater than in many terrestrial plant systems. As part of their defence systems, seaweeds, unlike terrestrial plants, produce a range of halogenated secondary metabolites, especially chlorinated and brominated compounds. Some orders of brown seaweeds also accumulate iodine, up to 1.2% of their dry weight. Fluorine remains rather unusual within the chemical structure. Halogenated hydrocarbons have moderate to high toxicities. In addition, halogenated organic compounds constitute a large group of environmental chemicals due to their extensive use in industry and agriculture. In recent years, concerns over the environmental fate and release of these halogenated organic compounds have resulted in research into their biodegradation and the evidence emerging shows that many of these compounds are more easily degraded under strictly anaerobic conditions compared to aerobic biodegradation. Biosorption via seaweed has become an alternative to the existing technologies in removing these pollutants. Halogenated compounds are known inhibitors of methane production from ruminants and humanmade anaerobic digesters. The focus of this paper is reviewing the available information on the effects of halogenated organic compounds on anaerobic digestion.

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“…The effect of redox condition on iodine enrichment during deposition is also provided by previous research conducted on recent marine sediment [14] , which suggests that high iodine concentration of oxidized sediment is mostly due to easier uptake of iodine relative to phytoplankton at the seafloor and iodine contained in planktonic matter originating in surface waters forms the bulk of iodine in reduced sediment. Besides, it is assessed iodine mobilization in the aerobic environment is less than in the anaerobic environment based on laboratory experiment of microalgae [15] . Different geochemical behavior of iodine is related closely to its species, which is also controlled by the redox condition [1,2] .…”

Section: The Implications Of Iodine Enrichmentmentioning

confidence: 99%

Implications of depositional environment on the iodine enrichment in the sedimentary system: evidences from the N-alkane in sediments

Xue

Wang

2019

E3S Web Conf.

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To understand the implications of depositional environment on the enrichment of iodine in sediments, the N-alkane analysis has been conducted on the sediment from the North China Plain (NCP). The iodine contents of sediments ranged from 0.03 to 2.54 μg/g with the highest content occurring in the depth of 170-185 m. The results of sediment N-alkane (TAR, ΣT/ΣM and ACL) indicate that the marine source input is the predominant factor controlling the enrichment of iodine in the groundwater system. The Pr/Ph ratios (from 0.13 to 1.68) and the plot of Pr/n-C17 vs. Ph/n-C18 suggest that sediments deposited under suboxic to anoxic conditions. Under the oxdizing conditions, the iodine tends to be rich in the sediment, while the iodine may prefers to be released into groundwater under the reducing conditions.

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Stabilisation of microalgae: Iodine mobilisation under aerobic and anaerobic conditions

Cited by 4 publications

References 32 publications

Volatile Metabolites Emission by In Vivo Microalgae—An Overlooked Opportunity?

Volatile Metabolites Emission by In Vivo Microalgae—An Overlooked Opportunity?

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

Implications of depositional environment on the iodine enrichment in the sedimentary system: evidences from the N-alkane in sediments

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