Anaerobic digestion of waste sludges from the alginate extraction process

Kerner, Karl N.; Hanssen, Jon Fredrik; Pedersen, T. A.

doi:10.1016/0960-8524(91)90107-u

Cited by 21 publications

(18 citation statements)

References 5 publications

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“…This process has the advantage of using wet algae (no need for expensive drying) (Harun et al 2011), but the establishment of this process at industrial scale still has many drawbacks due to production costs. Probably the best way to overcome this problem is by cultivation of algae in a multi-purpose facility, where other fuels and high-value products are also produced and extracted (Kerner et al 1991;Sialve et al 2009;Ehimen et al 2011).…”

Section: Biogasmentioning

confidence: 99%

Mixotrophic Algae Cultivation for Energy Production and Other Applications

Bassi

Saxena

Aguirre

2013

Algal Biorefineries

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Micro-algae offer potentially significant advantages over other approaches to overcome the current challenges of energy shortages and for pollution control. In addition major new directions in the genetic manipulation of algae and in new bioreactor design have been initiated in an effort to design new systems and approaches for this purpose. However, significant barriers for the commercialization of microalgae still exist including economic barriers, the level of technology readiness and lack of established co-products to make the overall process of energy from algae attractive. Mixotrophic algae cultivation offers the benefits of high biomass productivity and allows for integrated approaches which combine both photosynthetic and heterotrophic components during the diurnal cycle. This chapter focuses mainly on mixotrophic algae, the different methods of cultivation and different roles of algae in energy production. The large number of algal species and their versatile habitats and adaptability make mixotrophic microalgae serious candidates for applied research and development and for commercialization of new technologies. Approaches based on mixotrophic cultivation of algae will continue to play a role in efforts to mitigate the above mentioned challenges.

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Section: Biogasmentioning

confidence: 99%

Mixotrophic Algae Cultivation for Energy Production and Other Applications

Bassi

Saxena

Aguirre

2013

Algal Biorefineries

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“…Horn et al (2000) fermented Laminaria hyperborea extract for ethanol production (30°C and pH 5). Kerner et al (1991) presented an anaerobic digestion system for waste sludges produced during the industrial extraction of alginate, as did Carpentier et al (1988). The process compromised batch and semi-continuous cultures, at 35°C, with intermittent stirring and at a neutral pH (addition of NaOH).…”

Section: Introductionmentioning

confidence: 99%

“…The final filtration of this extraction process produces a sludge residue (on which this paper is based), which remains rich in nutrients and should offer potential for other products (Kerner et al 1991).…”

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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“…and Macrocystis are excellent substrates for biomethane generation (Bird et al 1990). The view expressed by many authors is that the best approach to biomethane production from macroalgae is the multipurpose use of algal biomass, for example gas evolution from the digestion of the residues from hydrocolloid extraction (Kerner et al 1991). In this way, the coproduction of methane with the other products could bring down the production costs and could make biomethane production profitable.…”

Section: Composition and Processing Of Macroalgal Biomassmentioning

confidence: 99%

Potential of Micro and Macro Algae for Biofuel Production: A Brief Review

Rajkumar¹,

Yaakob²,

Takriff³

2013

BioResources

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The world seems to be raising its energy needs owing to an expanding population and people's desire for higher living standards. Diversification biofuel sources have become an important energy issue in recent times. Among the various resources, algal biomass has received much attention in the recent years due to its relatively high growth rate, its vast potential to reduce greenhouse gas (GHG) emissions and climate change, and their ability to store high amounts of lipids and carbohydrates. These versatile organisms can also be used for the production of biofuel. In this review, sustainability and the viability of algae as an up-coming biofuel feedstock have been discussed. Additionally, this review offers an overview of the status of biofuel production through algal biomass and progress made so far in this area.

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Anaerobic digestion of waste sludges from the alginate extraction process

Cited by 21 publications

References 5 publications

Mixotrophic Algae Cultivation for Energy Production and Other Applications

Mixotrophic Algae Cultivation for Energy Production and Other Applications

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

Potential of Micro and Macro Algae for Biofuel Production: A Brief Review

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