Valorization of bio-residuals in the food and forestry sectors in support of a circular bioeconomy: A review

Gregg, Jay Sterling; Jürgens, Jonas; Happel, Maaike Karlijn; Strøm-Andersen, Nhat; Tanner, Anne Nygaard; Bolwig, Simon; Klitkou, Antje

doi:10.1016/j.jclepro.2020.122093

Cited by 68 publications

(43 citation statements)

References 71 publications

(249 reference statements)

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“…is minimal to non-existent. This is in line with the recognition of that weak market pull, needs for big investments, and the adoption of risk-averse approaches among the few incumbent firms in the sector are reducing the potential for the forestry industry to invest in technological and market capabilities for valorizing residuals [53].…”

Section: Incorporating Forest Management Into the Circular Economysupporting

confidence: 58%

Predicting Suitable Habitats of the African Cherry (Prunus africana) under Climate Change in Tanzania

Giliba

2020

Atmosphere

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Prunus africana is a fast-growing, evergreen canopy tree with several medicinal, household, and agroforestry uses, as well as ecological value for over 22 countries in sub-Saharan Africa. This species is under immense pressure from human activity, compounding its vulnerability to the effects of climate change. Predicting suitable habitats for P. africana under changing climate is essential for conservation monitoring and planning. This study intends to predict the impact of climate change on the suitable habitats for the vulnerable P. africana in Tanzania. We used maximum entropy modeling to predict future habitat distribution based on the representative concentration pathways scenario 4.5 and 8.5 for the mid-century 2050 and late-century 2070. Species occurrence records and environmental variables were used as a dependent variable and predictor variables respectively. The model performance was excellent with the area under curve (AUC) and true skill statistics (TSS) values of 0.96 and 0.85 respectively. The mean annual temperature (51.7%) and terrain ruggedness. index (31.6%) are the most important variables in predicting the current and future habitat distribution for P. africana. Our results show a decrease in suitable habitats for P. africana under all future representative concentration pathways scenario when compared with current distributions. These results have policy implications for over 22 countries of sub-Saharan Africa that are facing problems associated with the sustainability of this species. Institutional, policy, and conservation management approaches are proposed to support sustainable practices in favor of P. africana.

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Section: Incorporating Forest Management Into the Circular Economysupporting

confidence: 58%

Predicting Suitable Habitats of the African Cherry (Prunus africana) under Climate Change in Tanzania

Giliba

2020

Atmosphere

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“…Innovations for a circular bioeconomy are fourfold, according to Bröring et al (2020) [373]-product substitution, new bio-based processes, new biobased products and, last but not the least, new behaviour. Gregg et al (2020) [197], in their review of the dairy, brewery, slaughterhouse and forestry industries, have discovered that while the former avails of a strong and guaranteed market pull to invest in biowaste valorisation, the other three are hampered by the lack of the same and thereby are, by and large, fence-sitters in many parts of the world. Establishing a market pull is necessary for the entrenchment of a circular bio-economy, which can contribute to the attainment of 53 targets in 12 of the 17 SDGs [371,391] by year 2030, at which time, its value will be equal to USD 8 trillion [374].…”

Section: Discussionmentioning

confidence: 99%

Circular Bio-economy—Paradigm for the Future: Systematic Review of Scientific Journal Publications from 2015 to 2021

Govindarajan

2021

Circ.Econ.Sust.

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While ‘renewable’ is the keyword in a bioeconomy and resource conservation is the motivation behind a circular economy, a circular bioeconomy is one in which waste streams from renewable bio-resources are looped back into the technosphere—open-loop or closed-loop recycling or conversion from matter to energy. This systematic review brings together 385 publications from 2015 to 2021, originating from 50 countries and appearing in 150 journals, into a coherent account of the status quo of published research on circular bioeconomy. The numbers bear testimony to the growing interest in this field of research. Germany is the leading contributor to the scientific literature base (10%), while the Journal of Cleaner Production (9%) tops the list of journals in the fray. The methodology adopted has been clearly explained, and the discussion has been segmented into sub-sections and sub-sub-sections to do justice to the diversity of the nature of the publications. A little flexibility in organisation of the flow of the text has been availed of, to improve readability. The circular bioeconomy can be visualised as a set of ‘many through many to many’ relationships, enabling both economies of scale and scope in the longer run. This calls for extensive collaboration and cooperation among the numerous stakeholders involved. Several barriers will have to be overcome. Technology impact assessments and sustainability risk appraisals need to be carried out in order to ensure and convince stakeholders that they are on the right path. But as one knows and will appreciate, challenges lurk where there exist opportunities to be availed of, to replace the take-make-use-dispose paradigm of a linear economy to the grow-make-use-restore alternative. Graphical abstract

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“…These co-products may have several potential applications, such as electricity and heat generation [5], biofuel production [6], biopolymers [7], olefins [8], fertilizers [9], biochar [10], or bioflocculant [11], and/or other value-added products such as ingredients for livestock feed [12] or nutritional supplements [13]. Moreover, rendering of animal residues can significantly contribute to the 2030 UN Agenda for Sustainable Development [14], particularly to the UN sustainable development Goal 12 of responsible consumption and production, by promoting and facilitating the efficient use of natural resources throughout their life cycle and sustainable management, minimizing negative impacts on human health and environment, substantially reducing waste generation, and contributing to a more circular economy [15].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Agro-Industrial Residues: Bioprocessing of Animal Fats to Reduce Their Acidity

et al. 2021

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Adding value to agro-industrial residues is becoming increasingly important, satisfying needs to promote resources’ use efficiency and a more sustainable and circular economy. This work performs a parametric and kinetic study of enzymatic esterification of lard and tallow with high acidity, obtained by the rendering of slaughter by-products, allowing their use as a feed ingredient and increasing their market value. After an initial analysis of potential enzyme candidates, a Candida antarctica lipase B was selected as a biocatalyst for converting free fatty acids (FFA) to esters, using excess ethanol as the reagent. Results show that the fat acidity can be reduced by at least 67% in up to 3 h of reaction time at 45 °C, using the mass ratios of 3.25 ethanol/FFA and 0.0060 enzyme/fat. Kinetic modelling shows an irreversible second-order rate law, function of FFA, and ethanol concentration better fitting the experimental results. Activation energy is 54.7 kJ/mol and pre-exponential factor is 4.6 × 106 L mol−1 min−1.

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Valorization of bio-residuals in the food and forestry sectors in support of a circular bioeconomy: A review

Cited by 68 publications

References 71 publications

Predicting Suitable Habitats of the African Cherry (Prunus africana) under Climate Change in Tanzania

Predicting Suitable Habitats of the African Cherry (Prunus africana) under Climate Change in Tanzania

Circular Bio-economy—Paradigm for the Future: Systematic Review of Scientific Journal Publications from 2015 to 2021

Valorization of Agro-Industrial Residues: Bioprocessing of Animal Fats to Reduce Their Acidity

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