Ecological sustainability of aquafeed: An emergy assessment of novel or underexploited ingredients

Maiolo, Silvia; Cristiano, Silvio; Gonella, Francesco; Pastres, Roberto

doi:10.1016/j.jclepro.2021.126266

Cited by 19 publications

(16 citation statements)

References 27 publications

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“…Although the poultry sector is responsible for a substantial proportion of greenhouse gases emissions [9], these feedstuffs provide a valuable mean of animal by-products utilization and upgrade the ecological efficiency of the whole poultry production process [10]. Thus, the use of land animal proteins could enhance aquaculture's sustainability and eco-efficiency, as these have a more favorable carbon footprint and a higher environmental efficiency when compared with fishmeal and plant alternatives [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Dietary Fishmeal Replacement by Poultry By-Product Meal and Hydrolyzed Feather Meal on Liver and Intestinal Histomorphology and on Intestinal Microbiota of Gilthead Seabream (Sparus aurata)

et al. 2021

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The effects on liver and intestinal histomorphology and on intestinal microbiota in gilthead seabream (Sparus aurata) fed diets that contained poultry by-product meal (PBM) and hydrolyzed feather meal (HFM) as fishmeal replacements were studied. Fish fed on a series of isonitrogenous and isoenergetic diets, where fishmeal protein of the control diet (FM diet) was replaced by either PBM or by HFM at 25%, 50% and 100% without amino acid supplementation (PBM25, PBM50, PBM100, HFM25, HFM50 and HFM100 diets) or supplemented with lysine and methionine (PBM25+, PBM50+, HFM25+ and HFM50+ diets). The use of PBM and HFM at 25% fishmeal replacement generated a similar hepatic histomorphology to FM-fed fish, indicating that both land animal proteins are highly digestible at low FM replacement levels. However, 50% and 100% FM replacement levels by either PBM or HFM resulted in pronounced hepatic alterations in fish with the latter causing more severe degradation of the liver. Dietary amino acid supplementation delivered an improved tissue histology signifying their importance at high FM replacement levels. Intestinal microbiota was dominated by Proteobacteria (58.8%) and Actinobacteria (32.4%) in all dietary groups, but no specific pattern was observed among them at any taxonomic level. This finding was probably driven by the high inter-individual variability observed.

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Section: Introductionmentioning

confidence: 99%

Effects of Dietary Fishmeal Replacement by Poultry By-Product Meal and Hydrolyzed Feather Meal on Liver and Intestinal Histomorphology and on Intestinal Microbiota of Gilthead Seabream (Sparus aurata)

et al. 2021

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“…This is due to the less consumption of imported materials used in the treatment system despite the lesser renewable input. Maiolo et al [ 18 ] considered geothermal heat flow, tidal energy, wind, wave energy and rain as renewable input flow for production of dried microalgal biomass from Tetraselmis suecica and Tisochrysis lutea during outdoor cultivation using flat panel photobioreactor. Similarly, natural renewable input accounted for 7 and <0.01% in the passive and active treatment system, respectively [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

“…The main advantage of the microalgae-based technology is the use of biomass for biodiesel production following in situ transesterification process where the yield of biodiesel is around 10% [ 25 ], which is equivalent to 3.65 × 10 17 sej and 35% of overall emergy value. However, conventional extraction process of biodiesel from microalgal biomass showed that 59.40% of energy could be attributed to the overall emergy value [ 18 ]. Furthermore, enhanced hexane consumption and water loss caused by evaporation during extraction process also accounted for >7% of total emergy used by the system as reported recently by Maiolo et al [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, conventional extraction process of biodiesel from microalgal biomass showed that 59.40% of energy could be attributed to the overall emergy value [ 18 ]. Furthermore, enhanced hexane consumption and water loss caused by evaporation during extraction process also accounted for >7% of total emergy used by the system as reported recently by Maiolo et al [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

“…Although LCA is a valuable tool for measuring environmental effect, it does not consider the free ecosystem input of the process. Moreover, the amount of natural resource renewability and the planet’s ability to absorb the effects of the manufacturing process have an impact on environmental sustainability and, as a result, repeatability through time [ 18 ]. Any approach that considers both the environmental and sustainability aspects of energy systems coupled with the thermos-economic evaluation might be a good substitute.…”

Section: Introductionmentioning

confidence: 99%

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Sustainability Evaluation of Immobilized Acid-Adapted Microalgal Technology in Acid Mine Drainage Remediation following Emergy and Carbon Footprint Analysis

et al. 2022

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Sustainability evaluation of wastewater treatment helps to reduce greenhouse gas emissions, as it emphasizes the development of green technologies and optimum resource use rather than the end-of-pipe treatment. The conventional approaches for treating acid mine drainages (AMDs) are efficient; however, they need enormous amounts of energy, making them less sustainable and causing greater environmental concern. We recently demonstrated the potential of immobilized acid-adapted microalgal technology for AMD remediation. Here, this novel approach has been evaluated following emergy and carbon footprint analysis for its sustainability in AMD treatment. Our results showed that imported energy inputs contributed significantly (>90%) to the overall emergy and were much lower than in passive and active treatment systems. The microalgal treatment required 2–15 times more renewable inputs than the other two treatment systems. Additionally, the emergy indices indicated higher environmental loading ratio and lower per cent renewability, suggesting the need for adequate renewable inputs in the immobilized microalgal system. The emergy yield ratio for biodiesel production from the microalgal biomass after AMD treatment was >1.0, which indicates a better emergy return on total emergy spent. Based on greenhouse gas emissions, carbon footprint analysis (CFA), was performed using default emission factors, in accordance with the IPCC standards and the National Greenhouse Energy Reporting (NGER) program of Australia. Interestingly, CFA of acid-adapted microalgal technology revealed significant greenhouse gas emissions due to usage of various construction materials as per IPCC, while SCOPE 2 emissions from purchased electricity were evident as per NGER. Our findings indicate that the immobilized microalgal technology is highly sustainable in AMD treatment, and its potential could be realized further by including solar energy into the overall treatment system.

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Bioprocesses Coupling for Biohydrogen Production: Applications and Challenges

Magdalena,

Pérez-Bernal,

del Rosario Rodero

et al. 2024

Springer Water

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Ecological sustainability of aquafeed: An emergy assessment of novel or underexploited ingredients

Cited by 19 publications

References 27 publications

Effects of Dietary Fishmeal Replacement by Poultry By-Product Meal and Hydrolyzed Feather Meal on Liver and Intestinal Histomorphology and on Intestinal Microbiota of Gilthead Seabream (Sparus aurata)

Effects of Dietary Fishmeal Replacement by Poultry By-Product Meal and Hydrolyzed Feather Meal on Liver and Intestinal Histomorphology and on Intestinal Microbiota of Gilthead Seabream (Sparus aurata)

Sustainability Evaluation of Immobilized Acid-Adapted Microalgal Technology in Acid Mine Drainage Remediation following Emergy and Carbon Footprint Analysis

Bioprocesses Coupling for Biohydrogen Production: Applications and Challenges

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