Anaerobic Digestion of Laminaria japonica Waste from Industrial Production Residues in Laboratory- and Pilot-Scale

Barbot, Yann Nicolas; Thomsen, Claudia; Thomsen, Laurenz; Benz, Roland

doi:10.3390/md13095947

Cited by 24 publications

(18 citation statements)

References 58 publications

(98 reference statements)

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“…Methane yields obtained with a 300-L pilot-scale reactor was approximately 80% of that obtained from the smaller scale test (Ruffino et al, 2015). Small differences between BMPs and methane yields obtained with a 1700-L fermenter were observed for wastes from macroalgae processed for biofuel, pharmaceutical, or food industries (Barbot et al, 2015). Overall these different studies indicate that batch tests provide a good estimate of the methane yield that can be obtained at larger scale, however, in general with a slight overestimation.…”

Section: Comparison Of Measured and Calculated Methane Production Of mentioning

confidence: 73%

Methane Production of Full-Scale Anaerobic Digestion Plants Calculated from Substrate’s Biomethane Potentials Compares Well with the One Measured On-Site

2017

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Biomethane potential (BMP) tests are used to determine the amount of methane that can be produced from organic materials in order to design different components of fullscale anaerobic digestion (AD) plants such as size of the digesters and units exploiting the produced biogas. However, little is known on how well BMPs compare with biogas production from the same organic materials in full-scale installations. In this study, two AD plants were chosen to carry out such comparisons, a dry AD plant treating green waste from urban areas and food waste from restaurants and supermarkets, and a liquid AD plant treating waste sludge from wastewater treatment and seven additional organic wastes. The BMPs of multiple samples of the individual organic materials collected during a period of 7-9 months were determined. Separate tests of mixtures of organic materials confirmed that the BMP of the mixtures can be calculated by adding the BMPs of the individual materials. The weekly methane production during the investigated periods was calculated from the full-scale installation data on the feeding of the digesters and the BMPs of each substrate fed into the digesters and compared with the weekly methane production measured on-site. The latter was calculated from the most accurately measured entity, either the electricity or the volume of purified biomethane injected into the grid. The weekly methane production rates calculated from BMPs and the one measured on-site were very similar and followed the same pattern. Some exceptions could be explained by, e.g., an overload of the full-scale installation. The measured weekly methane production accounted for 94.0 ± 6.8 and 89.3 ± 5.7% of the calculated weekly methane production for the wet and dry AD plant, respectively. For 26 out of 29 weeks, the calculated weekly methane production overestimated the measured one in the case of the wet AD plant and for 37 out of 39 weeks for the dry AD plant. Based on these results, it is proposed using an extrapolation coefficient of 0.8 to 0.9 to estimate the methane production of full-scale AD plants from BMPs of the substrates to be digested and their specific organic loads.

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Section: Comparison Of Measured and Calculated Methane Production Of mentioning

confidence: 73%

Methane Production of Full-Scale Anaerobic Digestion Plants Calculated from Substrate’s Biomethane Potentials Compares Well with the One Measured On-Site

2017

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“…One approach to improving biogas may be to treat the seaweed prior to anaerobic digestion to break down recalcitrant polymers, such as alginic acid, to more readily digested simple molecules A variety of pre-treatment methods for biomass disruption, such as mechanical, thermal, enzymatic and thermo-chemical treatment, have been shown to improve methane production by 19% -68% (Barbot et al 2015). However, the energy and financial costs of these procedures may offset any potential gain from increased biogas output (Barbot et al 2016).…”

Section: Discussionmentioning

confidence: 99%

The inhibition of anaerobic digestion by model phenolic compounds representative of those from Sargassum muticum

2018

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Practical yields of biogas from the anaerobic digestion of macroalgae, and Sargassum muticum in particular, are substantially below the theoretical maximum. There is considerable conjecture about the reasons for the relatively low practical methane yields from seaweed and polyphenols are suggested as one of the elements in the low yield of methane from brown seaweeds. However, there appears to be little information on the effect of specific phenolics on defined substrates. This paper examines the effect of some simple phenolic compounds, representative of those reported in Sargassum muticum, on methane production from a range of model substrates. Three simple phenolics were selected, gallic acid, epicatechin and phloroglucinol; at four addition levels, 0, 0.5, 3.5 and 7.5% w/w of substrate; for four substrates, a readily digested simple organic substance, glycerol, and three polymers found in seaweed, cellulose, alginic acid and the sodium salt of alginic acid. Alginic acid and its sodium salt were found to be recalcitrant with average methane yields equivalent to only 23%-28% of their theoretical methane potential. Methane yield was further reduced by the presence of high concentrations (7% of substrate equivalent to 17.5 mg L-1) of phloroglucinol and epicatechin. None of the phenolic compounds studied appeared to inhibit the breakdown of the simple and readily digested compound, glycerol. Low methane yield in seaweed may be due to the recalcitrance of complex hydrocolloids and phenolic inhibition of the breakdown of more complex molecules in the initial hydrolysis stage of anaerobic digestion, but further research is required.

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“…The decomposition and pollution, together with variable and undefined composition, may make golden tides unsuitable for food, nutraceutical, and pharmaceutical use, and considerable sorting and cleaning may be required for other applications. Sand in the biomass may also be problematic, having been shown to increase technical problems and reduce biomethane conversion efficiency in the pilot scale anaerobic digestion of seaweed [118]. The collection of Sargassum immediately offshore from the beach, such as that proposed in Guadeloupe [119], may eliminate much of the decomposition, but the variability of the feedstock and potential for pollutants being present will remain.…”

Section: Cleaning and Sortingmentioning

confidence: 99%

“…Not only is it a relatively simple process from an engineering/infrastructure standpoint, but it has the potential to exploit the entire organic carbon content of macroalgae and can readily tolerate high moisture content without incurring additional process energy penalties. It is also readily scaled up [118]. A report for the Crown Estates has concluded that AD at a small, distributed scale was economically feasible for the co-digestion of seaweed with food waste [171].…”

Section: Anaerobic Digestionmentioning

confidence: 99%

“…The economics of the AD of seaweed could also be improved if it is part of a process that yields high-value products [173]. The residue remaining after the anaerobic digestion of seaweed, or digestate, is also considered to have considerable potential as fertiliser and could be an additional income source from the disposal of Sargassum [118].…”

Section: Anaerobic Digestionmentioning

confidence: 99%

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Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

Milledge

Harvey

2016

JMSE

163

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Abstract:In recent years there have been massive inundations of pelagic Sargassum, known as golden tides, on the beaches of the Caribbean, Gulf of Mexico, and West Africa, causing considerable damage to the local economy and environment. Commercial exploration of this biomass for food, fuel, and pharmaceutical products could fund clean-up and offset the economic impact of these golden tides. This paper reviews the potential uses and obstacles for exploitation of pelagic Sargassum. Although Sargassum has considerable potential as a source of biochemicals, feed, food, fertiliser, and fuel, variable and undefined composition together with the possible presence of marine pollutants may make golden tides unsuitable for food, nutraceuticals, and pharmaceuticals and limit their use in feed and fertilisers. Discontinuous and unreliable supply of Sargassum also presents considerable challenges. Low-cost methods of preservation such as solar drying and ensiling may address the problem of discontinuity. The use of processes that can handle a variety of biological and waste feedstocks in addition to Sargassum is a solution to unreliable supply, and anaerobic digestion for the production of biogas is one such process. More research is needed to characterise golden tides and identify and develop commercial products and processes.

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Anaerobic Digestion of Laminaria japonica Waste from Industrial Production Residues in Laboratory- and Pilot-Scale

Cited by 24 publications

References 58 publications

Methane Production of Full-Scale Anaerobic Digestion Plants Calculated from Substrate’s Biomethane Potentials Compares Well with the One Measured On-Site

Methane Production of Full-Scale Anaerobic Digestion Plants Calculated from Substrate’s Biomethane Potentials Compares Well with the One Measured On-Site

The inhibition of anaerobic digestion by model phenolic compounds representative of those from Sargassum muticum

Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

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