Microalgae-utilizing biorefinery concept for pulp and paper industry: Converting secondary streams into value-added products

Kouhia, Mikko; Holmberg, Henrik; Ahtila, Pekka

doi:10.1016/j.algal.2015.04.001

Cited by 28 publications

(9 citation statements)

References 38 publications

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“…Oleaginous yeasts offer an incredible alternative to microalgae for biodiesel production owing to the ability to easily scale up without seasonal and climatic variations, short life cycle, and high cell densities on a variety of low-cost raw materials, such as industrial wastewater containing sugars [9], agricultural wastes [10], raw glycerol [11] and wastewater streams [12]. Among these, wastewater remains the least explored source of microbial lipids.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous lipid production for biodiesel feedstock and decontamination of sago processing wastewater using Candida tropicalis ASY2

Thangavelu

Sundararaju

Srinivasan

et al. 2020

Biotechnol Biofuels

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Background: Without sufficient alternatives to crude oil, as demand continues to rise, the global economy will undergo a drastic decline as oil prices explode. Dependence on crude oil and growing environmental impairment must eventually be overcome by creating a sustainable and profitable alternative based on renewable and accessible feedstock. One of the promising solutions for the current and near-future is the substitution of fossil fuels with sustainable liquid feedstock for biofuel production. Among the different renewable liquid feedstock's studied, wastewater is the least explored one for biodiesel production. Sago wastewater is the byproduct of the cassava processing industry and has starch content ranging from 4 to 7%. The present investigation was aimed to produce microbial lipids from oleaginous yeast, Candida tropicalis ASY2 for use as biodiesel feedstock and simultaneously decontaminate the sago processing wastewater for reuse. Initial screening of oleaginous yeast to find an efficient amylolytic with maximum lipid productivity resulted in a potent oleaginous yeast strain, C. tropicalis ASY2, that utilizes SWW as a substrate. Shake flask experiments are conducted over a fermentation time of 240 h to determine a suitable fatty acid composition using GC-FID for biodiesel production with simultaneous removal of SWW pollutants using ASY2. Results: The maximum biomass of 0.021 g L −1 h −1 and lipid productivity of 0.010 g L −1 h −1 was recorded in SWW with lipid content of 49%. The yeast strain degraded cyanide in SWW (79%) and also removed chemical oxygen demand (COD), biological oxygen demand (BOD), nitrate (NO 3), ammoniacal (NH 4), and phosphate (PO 4) ions (84%, 92%, 100%, 98%, and 85%, respectively). GC-FID analysis of fatty acid methyl esters (FAME) revealed high oleic acid content (41.33%), which is one of the primary fatty acids for biodiesel production. Conclusions: It is evident that the present study provides an innovative and ecologically sustainable technology that generates valuable fuel, biodiesel using SWW as a substrate and decontaminates for reuse.

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Section: Introductionmentioning

confidence: 99%

Simultaneous lipid production for biodiesel feedstock and decontamination of sago processing wastewater using Candida tropicalis ASY2

Thangavelu

Sundararaju

Srinivasan

et al. 2020

Biotechnol Biofuels

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“…Additionally, interesting connections are apparent between AD inclusion in forest-based biorefineries and the extension of biorefinery feedstocks. In particular, the ability to use digestate from AD as a source for microalgae growth, and subsequent harvesting of high value algal lipids, poses a unique development possibility (Kouhia et al, 2015;Polishchuk et al, 2015). In several instances, the forest-based biorefinery literature also highlights that the presence of an AD system opens new opportunities for expanding waste sources and streams for co-digestion (Chinnaraj et al, 2011;Kemppainen et al, 2012).…”

Section: Forestmentioning

confidence: 99%

The role of biogas solutions in sustainable biorefineries

Hagman

Blumenthal

Eklund

et al. 2018

Journal of Cleaner Production

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Biorefineries strive to maximise product mix and value while contributing to the bioeconomy. Circularity and waste valorisation are some important but often neglected concepts in this context. As such, biogas solutions in biorefineries could be a key technology to improve sustainability. This study has, through a literature review and investigation into three Swedish case studies, analysed this relationship between biogas solutions and biorefineries by assessing the added value and development potential to which biogas solutions may contribute. This analysis across agricultural, forest, and marine sectors indicates that biogas solutions contribute with several added values, including through making the biorefinery more sustainable and competitive. The study also shows that biogas solutions can be an enabler of biorefinery development through making the system more resilient and versatile, as well as through improving the value of the product portfolio.

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“…Biorefineries should aim at producing high-value products first even though they are in small amounts, but low-value products which come in larger volumes should also be included in the product spectra of a biorefinery. In the biorefinery research, there is an increased focus on studying the importance of valorising biomass and by-products (see ElMekawy et al, 2013;Kouhia et al, 2015). To be more successful, it can be helpful for a biorefinery to have its own energy recovery to reduce external energy demand as there are often energy-intense processes (Wagemann, 2012).…”

Section: Biorefineries -Value From Biomassmentioning

confidence: 99%

How do biogas solutions influence the sustainability of bio-based industrial systems?

Hagman

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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Biomass is a valuable and limited resource that should be used efficiently. The potential of replacing fossil-based products with bio-based ones produced in biobased industrial systems is huge. One important aim of increasing the share of biobased products is to improve the sustainability of systems for production and consumption. Therefore, it is important to evaluate what solutions are available to improve the sustainability performance of bio-based industrial systems, and if they also bring negative impacts. The thesis focuses on assessing the role of biogas solutions in developing sustainable bio-based systems. Such assessments are often quite narrow in their scope and focus on quantitative environmental or economic aspects. This thesis aims at also including feasibility related aspects involving the contextual conditions that are assessed more qualitatively. Biogas solutions are identified as a versatile approach to treat organic materials which are generated in large volumes in bio-based industrial systems. The results show that biogas solutions in bio-based industrial systems (i) improve circular flows of energy and nutrients, (ii) are especially viable alternatives when the quality of the by-product streams become poorer, and (iii) may improve the profitability of the bio-based industrial system. To perform better assessments of these systems, it seems valuable to broaden the set of indicators assessed and include feasibility-related indicators, preferably through the involvement of relevant stakeholders as they contribute with different perspectives and can identify aspects that influence the sustainability in different areas. Future studies could benefit from applying those broader assessments on more cases to build on a more generalisable knowledge base.

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Microalgae-utilizing biorefinery concept for pulp and paper industry: Converting secondary streams into value-added products

Cited by 28 publications

References 38 publications

Simultaneous lipid production for biodiesel feedstock and decontamination of sago processing wastewater using Candida tropicalis ASY2

Simultaneous lipid production for biodiesel feedstock and decontamination of sago processing wastewater using Candida tropicalis ASY2

The role of biogas solutions in sustainable biorefineries

How do biogas solutions influence the sustainability of bio-based industrial systems?

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