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Giovanni Antonio Lutzu

Bio: Giovanni Antonio Lutzu is an academic researcher from Oklahoma State University–Stillwater. The author has contributed to research in topics: Biomass & Wastewater. The author has an hindex of 9, co-authored 20 publications receiving 398 citations. Previous affiliations of Giovanni Antonio Lutzu include University of Cagliari & Chinese Academy of Sciences.

Papers
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Journal ArticleDOI
TL;DR: This comprehensive review summarizes the most important and recent developments of microalgae use as supplement or feed additive to replace fishmeal and fish oil for use in aquaculture.
Abstract: Due to the rapid global expansion of the aquaculture industry, access to key feedstuffs (fishmeal and fish oil) is becoming increasingly limited because of the finite resources available for wild fish harvesting. This has resulted in other sources of feedstuffs being investigated, namely plant origin substitutes for fishmeal and fish oil for aquafeed. Conventional land-based crops have been favored for some applications as substitutes for a portion of the fishmeal, but they can result in changes in the nutritional quality of the fish produced. Microalgae can be regarded as a promising alternative that can replace fishmeal and fish oil and ensure sustainability standards in aquaculture. They have a potential for use in aquaculture as they are sources of protein, lipid, vitamins, minerals, pigments, etc. This comprehensive review summarizes the most important and recent developments of microalgae use as supplement or feed additive to replace fishmeal and fish oil for use in aquaculture. It also reflects the microalgal nutritional quality and digestibility of microalgae-based aquafeed. Simultaneously, safety and regulatory aspects of microalgae feed applications, major challenges on the use microalgae in aquafeed in commercial production, and future research and development perspective are also presented in a critical manner. This review will serve as a useful guide to present current status of knowledge and highlight key areas for future development of a microalgae-based aquafeed industry and overall development of a sustainable aquaculture industry.

261 citations

Journal ArticleDOI
TL;DR: This work addresses a novel mathematical model of the growth of Chlorella vulgaris in semi-batch photobioreactors fed with pure CO 2 (100% v/v) and it might represent a useful tool to develop suitable control and optimization strategies to improve microalgal cultures fed with high concentration of CO 2.

79 citations

Journal ArticleDOI
TL;DR: In this article, a review of the latest developments in algal technologies for environmental remediation, with a specific focus on novel applications in the field of petrochemical wastewater treatment, is presented.
Abstract: The use of microalgae is nowadays recognized to be an efficient and eco-friendly strategy for the removal of contaminants from wastewater. Thanks to their versatility, these photosynthetic organisms can grow in a broad spectrum of wastewaters, including those from agricultural, animal, municipal, and industrial sources, while converting nutrients such as nitrogen and phosphorus into useful products. Currently, microalgae are beginning to be exploited at large scale for the treatment of agricultural and municipal wastewaters. However, novel applications for specific types of wastewater, such as from petrochemical sources, while producing promising results, are still in their early stages. Thus, further work should be performed to optimize microalgal technology in light of its application to industrial contexts. Currently, there is also a growing interest in making these technologies even more economically and environmentally sustainable by using microalgal biomass, obtained during wastewater remediation processes, to produce novel bioplastic materials, potentially replacing petroleum-based counterparts and reducing the adverse impact of human activities and manufacturing on the environment. The present review will encompass the latest developments in algal technologies for environmental remediation, with a specific focus on novel applications in the field of petrochemical wastewater treatment. Then, a literature review of bioplastics production via microalgae and its integration into the wastewater treatment process will be conducted. Information gathered in this review can be used to identify research topics that need to be addressed in order to optimize the use of microalgae-based technology for wastewater remediation.

67 citations

Journal ArticleDOI
TL;DR: Oleaginous microalgae species Pseudochlorococcum was cultured in an attached biofilm and influential factors on the growth rate of biofilm were investigated and the results showed that Pseud CochlorOCoccum sp.
Abstract: The cultivation of microalgae in biofilm has been a potential way to overcome the shortcoming of conventional algal culture modes of open pond and photobioreactors in liquid suspension. However, the growth characteristics and related effect factors of the biofilm are still far from being understood. In this work, oleaginous microalgae species Pseudochlorococcum was cultured in an attached biofilm and influential factors on the growth rate of biofilm were investigated. The results showed that Pseudochlorococcum sp. preferred to accumulate more biomass on hydrophilic substrata than on hydrophobic one. The photon flux density of 100 μmol m−2 s−1 was its light saturation point. The optimal inoculum density was about 3–5 g m−2. The appropriate concentrations of nitrogen, phosphorus in medium and CO2 in aerated gas were determined as 8.8, 0.22 mmol L−1 and 1 %, respectively.

61 citations

Journal ArticleDOI
TL;DR: The final microalgae biomass, considering its high lipid content as well as its compliance with the standards for the quality of biodiesel, and considering also the high removal efficiencies obtained for macronutrients and organic carbon, makes the brewery wastewater a viable option as a priceless medium for the cultivation ofmicroalgae.
Abstract: This work investigates the potential use of a brewery wastewater as a medium for the cultivation of the oleaginous species Scenedesmus dimorphus with the double aim of removing nutrients and to produce biomass as feedstock for biodiesel. For this purpose, effects of nitrogen (61.8–247 mg L−1), phosphorous (1.4–5.5 mg L−1), and iron (1.5–6 mg L−1) concentrations on growth, nutrients uptake, lipid accumulation, and fatty acids profile of this microalga were investigated.Results showed that brewery wastewater can be used as a culture medium even if nitrogen and phosphorous concentrations should have been modified to improve both biomass (6.82 g L−1) and lipid accumulation (44.26%). The analysis revealed a C16–C18 composition of 93.47% fatty acids methyl esters with a relative high portion of unsaturated ones (67.24%). High removal efficiency (>99%) for total nitrogen and total phosphorous and a reduction of up to 65% in chemical oxygen demand were achieved, respectively.The final microalgae biomass, ...

40 citations


Cited by
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Journal ArticleDOI
22 Nov 2019
TL;DR: There is considerable scope for improved efficiency in fed aquaculture and the development and optimization of alternative protein sources for aquafeeds to ensure a socially and environmentally sustainable future for the Aquaculture industry.
Abstract: Approximately 70% of the aquatic-based production of animals is fed aquaculture, whereby animals are provided with high-protein aquafeeds. Currently, aquafeeds are reliant on fish meal and fish oil sourced from wild-captured forage fish. However, increasing use of forage fish is unsustainable and, because an additional 37.4 million tons of aquafeeds will be required by 2025, alternative protein sources are needed. Beyond plant-based ingredients, fishery and aquaculture byproducts and insect meals have the greatest potential to supply the protein required by aquafeeds over the next 10–20 years. Food waste also has potential through the biotransformation and/or bioconversion of raw waste materials, whereas microbial and macroalgal biomass have limitations regarding their scalability and protein content, respectively. In this review, we describe the considerable scope for improved efficiency in fed aquaculture and discuss the development and optimization of alternative protein sources for aquafeeds to ensure a socially and environmentally sustainable future for the aquaculture industry.

369 citations

Journal ArticleDOI
TL;DR: The identity, body of knowledge, safety concerns and antimicrobial resistance of valid taxonomic units were assessed and Lactobacillus animalis was a new taxonomic unit recommended to have the QPS status.
Abstract: Qualified presumption of safety (QPS) was developed to provide a generic safety evaluation for biological agents to support EFSA's Scientific Panels. The taxonomic identity, body of knowledge, safety concerns and antimicrobial resistance are assessed. Safety concerns identified for a taxonomic unit (TU) are where possible to be confirmed at strain or product level, reflected by 'qualifications'. No new information was found that would change the previously recommended QPS TUs and their qualifications. The list of microorganisms notified to EFSA was updated with 54 biological agents, received between April and September 2019; 23 already had QPS status, 14 were excluded from the QPS exercise (7 filamentous fungi, 6 Escherichia coli, Sphingomonas paucimobilis which was already evaluated). Seventeen, corresponding to 16 TUs, were evaluated for possible QPS status, fourteen of these for the first time, and Protaminobacter rubrum, evaluated previously, was excluded because it is not a valid species. Eight TUs are recommended for QPS status. Lactobacillus parafarraginis and Zygosaccharomyces rouxii are recommended to be included in the QPS list. Parageobacillus thermoglucosidasius and Paenibacillus illinoisensis can be recommended for the QPS list with the qualification 'for production purposes only' and absence of toxigenic potential. Bacillus velezensis can be recommended for the QPS list with the qualification 'absence of toxigenic potential and the absence of aminoglycoside production ability'. Cupriavidus necator, Aurantiochytrium limacinum and Tetraselmis chuii can be recommended for the QPS list with the qualification 'production purposes only'. Pantoea ananatis is not recommended for the QPS list due to lack of body of knowledge in relation to its pathogenicity potential for plants. Corynebacterium stationis, Hamamotoa singularis, Rhodococcus aetherivorans and Rhodococcus ruber cannot be recommended for the QPS list due to lack of body of knowledge. Kodamaea ohmeri cannot be recommended for the QPS list due to safety concerns.

347 citations

Journal ArticleDOI
19 Aug 2020-Nature
TL;DR: Modelled supply curves show that, with policy reform and technological innovation, the production of food from the sea may increase sustainably, perhaps supplying 25% of the increase in demand for meat products by 2050.
Abstract: Global food demand is rising, and serious questions remain about whether supply can increase sustainably1 Land-based expansion is possible but may exacerbate climate change and biodiversity loss, and compromise the delivery of other ecosystem services2–6 As food from the sea represents only 17% of the current production of edible meat, we ask how much food we can expect the ocean to sustainably produce by 2050 Here we examine the main food-producing sectors in the ocean—wild fisheries, finfish mariculture and bivalve mariculture—to estimate ‘sustainable supply curves’ that account for ecological, economic, regulatory and technological constraints We overlay these supply curves with demand scenarios to estimate future seafood production We find that under our estimated demand shifts and supply scenarios (which account for policy reform and technology improvements), edible food from the sea could increase by 21–44 million tonnes by 2050, a 36–74% increase compared to current yields This represents 12–25% of the estimated increase in all meat needed to feed 98 billion people by 2050 Increases in all three sectors are likely, but are most pronounced for mariculture Whether these production potentials are realized sustainably will depend on factors such as policy reforms, technological innovation and the extent of future shifts in demand Modelled supply curves show that, with policy reform and technological innovation, the production of food from the sea may increase sustainably, perhaps supplying 25% of the increase in demand for meat products by 2050

346 citations

Journal ArticleDOI
TL;DR: In this paper, the feasibility and sustainability of food waste derived chemicals, together with the market outlook of recycling and valorization of food wastes from state-of-the-art perspectives are discussed.

207 citations

Journal ArticleDOI
TL;DR: This paper reviewed potential sources of single cell protein (SCP) strains and their respective production processes, highlight recent advances on identification of new SCP strains and feedstocks, and, finally, review new feeding trial data on important aquaculture species, specifically Atlantic salmon, rainbow trout, and whiteleg shrimp.

174 citations