Anaerobic digestion of Laminaria spp. and Ascophyllum nodosum and application of end products

Hanssen, Jon Fredrik; Indergaard, Mentz; Østgaard, Kjetill; Bævre, Olav Arne; Pedersen, T. A.; Jensen, Arne

doi:10.1016/0144-4565(87)90019-9

Cited by 70 publications

(41 citation statements)

References 11 publications

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“…The levels' values were selected by considering previous studies on the subject [29,31]. According to these studies, a centre point at 10 min and 2.5% of VS concentration was also selected.…”

Section: Response Surface Methodology (Rsm)mentioning

confidence: 99%

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Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

et al. 2016

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h i g h l i g h t sAutumn was the best harvesting period of Laminaria sp. as feedstock for AD, in Ireland. During spring, the system was improved by applying the pretreatment and at a VS concentration of 2.5%. Higher methane yields were observed at short pretreatment times and at VS concentration below 2.5%. A positive energy balance was estimated in autumn and early spring. a b s t r a c tBrown seaweeds are a suitable substrate for biogas production through anaerobic digestion (AD). Since the carbohydrates' content is subjected to a seasonal variation, this research aimed to select the best harvesting period of beach cast brown seaweed Laminaria sp. for methane production, while optimising the use of a beating pretreatment and the organic substrate concentration. Response surface methodology (RSM) was used to estimate the effect of the beating pretreatment in terms of pretreatment time (5-10-15 min) and organic matter concentration in terms of volatile solids (VS) (1-2.5-4%) on methane production. The highest methane yield of 342 ± 17 ml g À1 VS was observed during November at 1% of VS and after 5 min of pretreatment, while the lowest yields were registered in March with an average of 163 ± 28 ml g À1 VS. However, an enhancement of 47% with respect to the untreated sample was achieved at 2.5% of VS and after 15 min of pretreatment, in March.

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Section: Response Surface Methodology (Rsm)mentioning

confidence: 99%

“…Amongst all the parameters which influence the biogas yields, the substrate concentration is one of the most crucial [31]. It is known that an excessive substrate concentration leads to imbalances in the bacterial population, leading to VS accumulation and digester failure [32].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

et al. 2016

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“…Hanssen et al [10] Other studies on anaerobic digestion have shown lower methane yields. Furthermore in the same study (also in the present one) was shown that a large fraction of the sugars present (mannitol and laminarin) in macro-algae are passing in the liquefaction water phase which could be potentially used as a feedstock for further fermentation of the sugars to ethanol.…”

Section: Comparison Of Liquefaction Products With Biochemical Conversmentioning

confidence: 99%

“…It was of interest to compare how these biochemical processes compare with hydrothermal liquefaction on energy content of product yields. In order to do that, data from published work for fermentation of brown macro-algae [6], [7], [11] and [12] as well as data from published work for anaerobic digestion of brown macro-algae [7], [8], [9], [10] and [13] were compared with the results of this study.…”

Section: Comparison Of Liquefaction Products With Biochemical Conversmentioning

confidence: 99%

Hydrothermal liquefaction of four brown macro-algae commonly found on the UK coasts: An energetic analysis of the process and comparison with bio-chemical conversion methods

Anastasakis

Ross

2015

Fuel

116

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Hydrothermal liquefaction (HTL) of four brown macro-algae was used to produce bio-crude and bio-char in an energy favourable way. Bio-crude yields between 9.8wt% and 17.8wt% (daf) with HHVs between 32 and 34 MJ/kg and biochar yields between 10.9wt% and 18.6wt% (db) with HHVs between 15.7 and 26.2 MJ/kg were produced. A modification of the energy consumption ratio (ECR) index was attempted in order to include in the formula the calculation of the specific heat capacity of the feedstock used, as well as the increase of the specific heat capacity of 1 water with temperature. A comparison in terms of energy output was made between the products from HTL and products from bio-chemical conversion of macro-algae such as anaerobic digestion (AD) and fermentation. The results indicate that HTL has higher energy output than fermentation and analogue of that from anaerobic digestion (7.91 MJ/kg seaweed and 8.25 MJ/kg seaweed from HTL and AD respectively).

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“…However, if a cost-effective, more complete digestion were possible by alternate means, then a supplementary product, or extract, might arise. Some authors have investigated microbial digestions of fresh brown seaweeds as a biogas source (Hanssen et al 1987), employing batch and semi-continuous cultures of anaerobic digestion at 35°C. In this particular study, A. nodosum showed lower production of gas than the Laminaria spp studied.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the microbial digestion of an industrial seaweed-based residue

2012

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Commercial preparation of a seaweed extract from the brown alga Ascophyllum nodosum for use as fertiliser and soil improver produces a sludge residue which requires remediation. This residue is rich in nutrients and offers the potential for other value-added products. The residue composition was analysed, a microbial digestion process for the residue was developed, and several factors affecting the digestion process were studied. The residue showed an alkaline pH (8.61±0.39) and 16% (w/w) total solids, which comprised 40.6% mineral, 29.5% fibre, 24.3% lipid, 4.9% protein and 0.5% polyphenols. The optimised digestion system included a 3-day anaerobic phase to decrease pH (from 8.96±0.40 to 7.72±0.38), the addition of an inoculum, followed by a 10-day aerobic phase where the insoluble material was digested. Every 3 days, the solubilised material was decanted and replaced with water to delay metabolite inhibition. The rate of digestion (decrease in insoluble material of 28.6±14.2% over 13 days) was influenced by the initial insoluble (R 2 00.773) and soluble (R 2 0 0.672) matter, the pH at the beginning of the aerobic phase (R 2 00.528) and by the accumulation of solubilised digestion products. A compositional analysis of the insoluble material after digestion showed that the lipid content of the residue was 96% digested and that the proportion of protein increased by 82.4%. Inocula and metabolite inhibition were critical features of A. nodosum residue digestion. Similar organic residues require a carefully chosen inoculum and a minimum initial insoluble content (65-70%) and/or a maximum soluble content (25.30%).

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Anaerobic digestion of Laminaria spp. and Ascophyllum nodosum and application of end products

Cited by 70 publications

References 11 publications

Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

Hydrothermal liquefaction of four brown macro-algae commonly found on the UK coasts: An energetic analysis of the process and comparison with bio-chemical conversion methods

Factors affecting the microbial digestion of an industrial seaweed-based residue

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