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Articoli di riviste sul tema "Valorisation des microalgues"

Autore: Grafiati

Pubblicato: 26 settembre 2023

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1

Bauzá, J., B. Ruiz, A. Pascual e L. Thomas. "Biomaqua project: Energetic valorisation of microalgae". Journal of Biotechnology 150 (novembre 2010): 183. http://dx.doi.org/10.1016/j.jbiotec.2010.08.476.

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González, Inmaculada, Natalia Herrero, José Ángel Siles, Arturo F. Chica, M. Ángeles Martín, Carlos García Izquierdo e José María Gómez. "Wastewater nutrient recovery using twin-layer microalgae technology for biofertilizer production". Water Science and Technology 82, n. 6 (10 agosto 2020): 1044–61. http://dx.doi.org/10.2166/wst.2020.372.

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Abstract This study evaluates the feasibility of advanced biofilm microalgae cultivation in a twin layer (TL) system for nutrient removal (N and P) as the tertiary treatment in small wastewater treatment plants (WWTPs) located in sensitive areas. Furthermore, the potential valorisation of microalgae biomass as a component of bio-based fertilizers is assessed. Scenedesmus sp. was chosen among 33 microalgae strains for inoculation of TL due to its high growth rate and its nutrient uptake capacity. The tests carried out in the prototype were markedly efficient for total soluble and ammoniacal nitrogen removal (up to 66 and 94%, respectively). In terms of potential valorisation of microalgae, the nutrient content was 5.5% N (over 40% protein), 8.8% P2O5 and 1.5% K2O, high enzymatic activity, very low levels of heavy metals and no detectable pathogen presence. However, in the formulation of solid-state bio-based fertilizers, the microalgae proportions in blends of over 2% of microalgae led to negative effects on ryegrass (Lolium perenne L. ssp.) and barley (Hordeum vulgare ssp.). The obtained results demonstrate that TL represents a promising technology, which allows efficient tertiary treatment of urban wastewater and the production of high-quality bio-based fertilizer.

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Juárez, Judit Martín, Jelena Vladic, Silvia Bolado Rodríguez e Senka Vidovic. "Sequential valorisation of microalgae biomass grown in pig manure treatment photobioreactors". Algal Research 50 (settembre 2020): 101972. http://dx.doi.org/10.1016/j.algal.2020.101972.

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4

Sahni, Prashant, Poonam Aggarwal, Savita Sharma e Baljit Singh. "Nuances of microalgal technology in food and nutraceuticals: a review". Nutrition & Food Science 49, n. 5 (9 settembre 2019): 866–85. http://dx.doi.org/10.1108/nfs-01-2019-0008.

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PurposeThe purpose of this paper is to acquaint the readers with the insights regarding the interventions of microalgal technology for production of metabolites and functional ingredients from microalgae for food and nutraceutical application and exploration of microalgae biomass for food application.Design/methodology/approachVarious information databases such as journals, library catalogues and professional websites were used to collect information pertaining to application of microalgae in food and nutraceutical sector. Systematic review was made with recent studies covering the vital aspects of art of microalgae cultivation for metabolite production, functional ingredients from microalgae, market scenario and utilisation of microalgae biomass for the valorisation of the food products. Key points have been discussed after every section to highlight the practical implications to make this review more insightful for the readers.FindingsMicroalgal technology provides sustainable solution for its application in food and nutraceutical sector. The heart of metabolite production lies in the optimisation of cultivation conditions of microalgae. Wide array of functional components are obtained from microalgae. Microalgae offer an alternative source for omega-3 fatty acids. Microalgae is widely exploited for production of pigments, namely, ß-carotene, astaxanthin, lutein, phycocyanin and chlorophyll, that have important implication as natural colourants and nutraceuticals in food. Larger diversity of sterols found in microalgae confers bioactivity. Microalgae is finding its place in market shelves as nutraceuticals where its functional ingredients are in the form of powder, tablets, extract and beverages and in innovative products such as microalgae protein and fat, culinary algae oil and butter. Sprulina and Chlorella are popular choice for the supplementation of food products with microalgae biomass.Originality/valueThis is a comprehensive review that highlights the application of microalgal technology for the development of healthy food products and presents holistic intervention in food and nutraceutical sector.

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Esteves, Ana F., Sara M. Soares, Eva M. Salgado, Rui A. R. Boaventura e José C. M. Pires. "Microalgal Growth in Aquaculture Effluent: Coupling Biomass Valorisation with Nutrients Removal". Applied Sciences 12, n. 24 (8 dicembre 2022): 12608. http://dx.doi.org/10.3390/app122412608.

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Natural resources are becoming increasingly scarce, and the need to control their consumption and recycle their use is growing. Water is one of the essential resources for human survival. Therefore, there has been an increasing interest in ways to save, recycle and treat water supplies. Aquaculture is one of the most polluting activities as it produces a significant wastewater volume, which needs proper treatment before being discharged into the environment or recycled. Microalgae are a potential solution for wastewater treatment. Due to their numerous advantages, the use of microalgal biomass is being studied, and, at present, there is already a market and room for profit in the sale of microalgal components in various forms, such as animal and human supplements. From a biorefinery point of view, it is important to take advantage of all the qualities and benefits that microalgae have by combining their great capacity to treat wastewater and exploit the produced biomass, analysing its composition for subsequent valorisation, for example. In this study, Chlorella vulgaris was used to treat aquaculture wastewater from a trout farm aquaculture facility, and the treatment efficiency was evaluated. To valorise the resulting biomass, its composition was also assessed. C. vulgaris successfully grew in the effluent with growth rates of 0.260 ± 0.014 d−1 and with average productivity of 32.9 ± 1.6 mg L−1 d−1. The achieved removal efficiencies were 93.5 ± 2.1% for total nitrogen, 98.0 ± 0.1% for nitrate-nitrogen and 92.7 ± 0.1% for phosphate-phosphorus. Concerning biomass composition, the lipids (15.82 ± 0.15%), carbohydrates (48.64 ± 0.83%), and pigment contents (0.99 ± 0.04% for chlorophyll a + b and 0.21 ± 0.04% for carotenoids) were similar to the values of similar studies. However, the protein content obtained (17.93 ± 1.21%) was lower than the ones mentioned in the literature.

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Sepúlveda-Muñoz, Cristian A., Ignacio de Godos e Raúl Muñoz. "Wastewater Treatment Using Photosynthetic Microorganisms". Symmetry 15, n. 2 (16 febbraio 2023): 525. http://dx.doi.org/10.3390/sym15020525.

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Wastewaters are mainly classified as domestic, industrial and agro-industrial based on their production source. Piggery wastewater (PWW) is a livestock wastewater characterized by its high concentrations of organic matter and ammonium, and by its odour nuisance. Traditionally, PWW has been treated in open anaerobic lagoons, anaerobic digesters and activated sludge systems, which exhibit high greenhouse gas emissions, a limited nutrients removal and a high energy consumption, respectively. Photosynthetic microorganisms can support a sustainable wastewater treatment in engineered photobioreactors at low operating costs and with an efficient recovery of carbon, nitrogen and phosphorous. These microorganisms are capable of absorbing solar irradiation through the photosynthesis process to obtain energy, which is used for their growth and associated carbon and nutrients assimilation. Purple phototrophic bacteria (PPB) represent the photosynthetic microorganisms with the most versatile metabolism in nature, whereas microalgae are the most-studied photosynthetic microorganisms in recent years. This review describes the fundamentals, symmetry and asymmetry of wastewater treatment using photosynthetic microorganisms such as PPB and microalgae. The main photobioreactor configurations along with the potential of PPB and microalgae biomass valorisation strategies are also discussed.

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Huang, Zhigang, Jiang Zhang, Minmin Pan, Yuhang Hao, Ruichen Hu, Wenbo Xiao, Gang Li e Tao Lyu. "Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production". Biochemical Engineering Journal 179 (febbraio 2022): 108330. http://dx.doi.org/10.1016/j.bej.2021.108330.

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Milhazes-Cunha, Hugo, e Ana Otero. "Valorisation of aquaculture effluents with microalgae: The Integrated Multi-Trophic Aquaculture concept". Algal Research 24 (giugno 2017): 416–24. http://dx.doi.org/10.1016/j.algal.2016.12.011.

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Amaro, Helena M., Eva M. Salgado, Olga C. Nunes, José C. M. Pires e Ana F. Esteves. "Microalgae systems - environmental agents for wastewater treatment and further potential biomass valorisation". Journal of Environmental Management 337 (luglio 2023): 117678. http://dx.doi.org/10.1016/j.jenvman.2023.117678.

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Spennati, Elena, Alessandro Alberto Casazza, Attilio Converti, Matthew P. Padula, Fariba Dehghani, Patrizia Perego e Peter Valtchev. "Winery waste valorisation as microalgae culture medium: A step forward for food circular economy". Separation and Purification Technology 293 (luglio 2022): 121088. http://dx.doi.org/10.1016/j.seppur.2022.121088.

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Silva, Andreia, Ricardo N. Coimbra, Carla Escapa, Sónia A. Figueiredo, Olga M. Freitas e Marta Otero. "Green Microalgae Scenedesmus Obliquus Utilization for the Adsorptive Removal of Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) from Water Samples". International Journal of Environmental Research and Public Health 17, n. 10 (25 maggio 2020): 3707. http://dx.doi.org/10.3390/ijerph17103707.

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In view of the valorisation of the green microalga Scenedesmus obliquus biomass, it was used for the biosorption of two nonsteroidal anti-inflammatory drugs, namely salicylic acid and ibuprofen, from water. Microalgae biomass was characterized, namely by the determination of the point of zero charge (pHPZC), by Fourier transform infrared (FT-IR) analysis, simultaneous thermal analysis (STA) and scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS). Kinetic and equilibrium batch experiments were carried out and results were found to fit the pseudo-second order equation and the Langmuir isotherm model, respectively. The Langmuir maximum capacity determined for salicylic acid (63 mg g−1) was larger than for ibuprofen (12 mg g−1), which was also verified for a commercial activated carbon used as reference (with capacities of 250 and 147 mg g−1, respectively). For both pharmaceuticals, the determination of thermodynamic parameters allowed us to infer that adsorption onto microalgae biomass was spontaneous, favourable and exothermic. Furthermore, based on the biomass characterization after adsorption and energy associated with the process, it was deduced that the removal of salicylic acid and ibuprofen by Scenedesmus obliquus biomass occurred by physical interaction.

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Bellucci, Micol, Francesca Marazzi, Alida Musatti, Riccardo Fornaroli, Andrea Turolla, Simone Visigalli, Martina Bargna et al. "Assessment of anammox, microalgae and white-rot fungi-based processes for the treatment of textile wastewater". PLOS ONE 16, n. 3 (2 marzo 2021): e0247452. http://dx.doi.org/10.1371/journal.pone.0247452.

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The treatability of seven wastewater samples generated by a textile digital printing industry was evaluated by employing 1) anammox-based processes for nitrogen removal 2) microalgae (Chlorella vulgaris) for nutrient uptake and biomass production 3) white-rot fungi (Pleurotus ostreatus and Phanerochaete chrysosporium) for decolorization and laccase activity. The biodegradative potential of each type of organism was determined in batch tests and correlated with the main characteristics of the textile wastewaters through statistical analyses. The maximum specific anammox activity ranged between 0.1 and 0.2 g N g VSS-1 d-1 depending on the sample of wastewater; the photosynthetic efficiency of the microalgae decreased up to 50% during the first 24 hours of contact with the textile wastewaters, but it improved from then on; Pleurotus ostreatus synthetized laccases and removed between 20–62% of the colour after 14 days, while the enzymatic activity of Phanerochaete chrysosporium was inhibited. Overall, the findings suggest that all microbes have great potential for the treatment and valorisation of textile wastewater after tailored adaptation phases. Yet, the depurative efficiency can be probably enhanced by combining the different processes in sequence.

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Fernández-Acero, Francisco Javier, Francisco Amil-Ruiz, María Jesús Durán-Peña, Rafael Carrasco, Carlos Fajardo, Palmira Guarnizo, Carlos Fuentes-Almagro e Roberto A. Vallejo. "Valorisation of the microalgae Nannochloropsis gaditana biomass by proteomic approach in the context of circular economy". Journal of Proteomics 193 (febbraio 2019): 239–42. http://dx.doi.org/10.1016/j.jprot.2018.10.015.

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Silkina, Alla, Naomi E. Ginnever, Fleuriane Fernandes e Claudio Fuentes-Grünewald. "Large-Scale Waste Bio-Remediation Using Microalgae Cultivation as a Platform". Energies 12, n. 14 (19 luglio 2019): 2772. http://dx.doi.org/10.3390/en12142772.

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Municipal and agricultural waste treatment is one of the key elements of reducing environmental impact with direct effects on the economy and society. Algal technology has been tested to enable effective recycling and valorisation of wastewater nutrients including carbon, nitrogen and phosphorus. An integrated evaluation and optimisation of the sustainability of an algal bio-refinery, including mass and energy balances, carbon, water and nutrient use and impact analysis, was assessed. A bio-refinery approach of waste remediation using algal cultivation was developed at Swansea University, focusing on nutrient recovery via algal biomass exploitation in pilot facilities. Mass cultivation (up to 1.5 m3) was developed with 99% of nitrogen and phosphorus uptake by microalgal cultures. Nannochloropsis oceanica was used as a biological model and grown on three waste sources. The compounds obtained from the biomass were evaluated for animal feed and as a potential source of energy. The bioremediation through algal biotechnology was examined and compared to alternative nutrient recovery passive and active methods in order to know the most efficient way of excess nutrient management. Conclusions emphasise the high potential of algal biotechnology for waste remediation and nutrients recovery, despite the need for further development and scalable applications of this new technology.

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González-Benito, G., V. Barrocal, S. Bolado, M. Coca e M. T. García-Cubero. "Valorisation of by-products from food industry, for the production of single cell protein (SCP) using microalgae". New Biotechnology 25 (settembre 2009): S262. http://dx.doi.org/10.1016/j.nbt.2009.06.586.

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Avila, Romina, Álvaro Justo, Elvira Carrero, Eudald Crivillés, Teresa Vicent e Paqui Blánquez. "Water resource recovery coupling microalgae wastewater treatment and sludge co-digestion for bio-wastes valorisation at industrial pilot-scale". Bioresource Technology 343 (gennaio 2022): 126080. http://dx.doi.org/10.1016/j.biortech.2021.126080.

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KAZBAR, Antoinette, Imma GIFUNI, Christophe LOMBARD, Benoit DEGRENNE, Jérémy PRUVOST e Olivier LéPINE. "Valorisation industrielle des microalgues photosynthétiques". Chimie verte, dicembre 2021. http://dx.doi.org/10.51257/a-v1-chv4032.

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JENCK, Jean, Olivier LÉPINE, Jack LEGRAND, Philippe DRENO, Dominique GRIZEAU e Catherine DUPRÉ. "Valorisation industrielle des microalgues photosynthétiques". Bioprocédés et bioproductions, novembre 2011. http://dx.doi.org/10.51257/a-v1-in201.

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Girotto, Francesca, e Laura Piazza. "Food waste bioconversion into new food: A mini-review on nutrients circularity in the production of mushrooms, microalgae and insects". Waste Management & Research: The Journal for a Sustainable Circular Economy, 4 agosto 2021, 0734242X2110381. http://dx.doi.org/10.1177/0734242x211038189.

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The global challenge of feeding an ever-increasing world population is leading scientists’ attention towards nutritious and sustainable foods whose production should have low impacts on environment, economy and society. In case the input feedstock can be waste nutrients, the label of such productions becomes even greener. Nutrients circularity is nowadays an important circular economy practice. This mini-review focuses on the valorisation of food waste as precious biomass to grow new food and feed. In particular, three functional edibles are discussed in the present paper: mushrooms, microalgae and insects. These foods are part of people diets since ages in certain areas of the world and the original aspect of their cultivation and breeding found on waste nutrients recovery is here reviewed. Proofs of such food waste biorefinery viability are already given by several researches featuring the main traits of a suitable growing medium: optimal pool of nutrients and optimal pH. However, lot of work still needs to be done in order to assess the optimal growth and cultivation conditions and the health security of the harvested/bred edibles. A SWOT factors analysis was performed.

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Bemejo-Padilla, E., H. Kinsou, R. Filali, B. Perez-Bibbins e B. Taidi. "Rapid indicators for monitoring the health of Chlamydomonas nivalis biomass during preservation". Journal of Applied Phycology, 2 agosto 2021. http://dx.doi.org/10.1007/s10811-021-02517-w.

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AbstractMicroalgae are photosynthetic microorganisms that have increasingly attracted interest in the last decade due to their potential for industrial applications. One crucial aspect for the industrial-scale valorisation of algae biomass concerns the quality control during its preservation before being treated to obtain the end-product. Monitoring biomass quality is essential and can be potentially accomplished with the aid of specific biochemical indicators called biomarkers. In this context, the main aim of this work was to identify potential indicators of microalgae biomass viability that could be used as markers of its quality during storage/preservation for commercial operations. The health status of a suspension of Chlamydomonas nivalis was assessed at 4 ºC and 25 ºC during 10 days of storage. The use of the pulse-amplitude-modulation technique, based on chlorophyll fluorescence, was a valuable indicator of the culture viability. The measurement of DNA and of chlorophyll in the supernatant, indicative of cell lysis, also provided satisfactory results; in the case of the DNA, the limit of detection was 3.9 µg DNA·mL−1. The effect of different concentrations of a well-known and cheap preservative, acetic acid, was also evaluated at 4 ºC. This work identified three suitable biomarkers to be used as rapid indicators of the quality of the microalgal suspension prior to its reception for biorefinery activities.

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