ANGELA MARCHETTI

Dottoressa di ricerca

ciclo: XXXIV


supervisore: Prof.ssa Marianna Villano

Titolo della tesi: Optimisation of biotechnological processes for polyhydroxyalkanoates production from food industry by-products

This thesis is part of the European Horizon 2020 project, entitled “USABLE Packaging” (Unlocking the potential of Sustainable BiodegredabLe Packaging, BBI JU-Project ID: 836884). The aim of this project was to develop plastic materials that are biodegradable and bio-based, and that does not compete with the food chain or cause land use problems, thus implementing a correct circular economy in the plastics sector. To date, the continuous impoverishment of the land, the increase in atmospheric emissions and, in general, the increase in pollution in all environmental sectors, has generated the interest of the scientific, social and political world in finding increasingly green and eco-sustainable solutions. Among the solutions proposed by the new circular economy model is undoubtedly the replacement of some non-recyclable and non-biodegradable materials with more eco-friendly alternatives. One of the most widely used materials in the world is plastic, a material that is as useful and versatile as it is harmful to the environment and human health if not disposal correctly at the end-of-life. Therefore, replacing fuel-based plastics with bio-based and biodegradable products would be beneficial on several fronts. Indeed, this would reduce the volume of waste dumped into the environment, the amount of greenhouse gases released into the atmosphere and all the environmental risks associated with these issues. Thus, biopolymers have emerged as a great alternative, as they come from renewable sources and can be biodegradable. Among the others, polyhydroxyalkanoates (PHAs) are one of the most promising bioplastics, as they are synthesised by microbial fermentation of renewable resources such as agro-industrial and urban waste, are biodegradable, biocompatible, non-toxic, with properties comparable to their petroleum-based counterparts. Thanks to its characteristics, PHA can be used for a wide range of applications, but above all it can overcome the problems caused especially by non-biodegradable packaging. In this context, the general objective of this PhD thesis was: The optimisation of the PHA production process by means of mixed microbial cultures and purple bacteria, testing different operating conditions to obtain a polymer while valorizing food industry by-products. To achieve this goal, specific objectives had to be realized: 1 Implementing sustainable production of volatile fatty acids as precursors in the production of PHA from MMC. 1.1 Evaluation of fermentation degree of food industry by-products through acidogenic fermentation process. Study performed through batch tests and semi-continuous stirred tank reactor. 2 Management of a sequencing batch reactor for the PHA-MMC production. 2.2 Study of the Influence of the Organic Loading Rate applied and of the cycle length using a synthetic acids mixture as substrate in the PHA-MMC production through a sequencing batch reactor in laboratory scale. 2.3 Influence of real feed, obtained from the acidogenic fermentation semi-continuous test, on selected biomass at different OLRs during the accumulation tests. 2.4 PHA-MMC production operated under different feeding conditions. 3 PHA production from photosynthetic micro culture and from phototrophic purple bacteria. 3.2 Study of permanent Feast regime, through a laboratory scale SBR, using real feed as a substrate in purple bacteria-PHA production.

Produzione scientifica

  • 11573/1688607 - 2023 - Evaluation of the acidogenic fermentation potential of food industry by-products (01a Articolo in rivista)
    MARCHETTI, ANGELA; SALVATORI, GAIA; ASTOLFI, MARIA LUISA; VILLANO, MARIANNA
  • 11573/1682988 - 2023 - Characterization of P(3HB-co-3HV) with different 3HV content: Effect on properties, processability and miscibility with mcl-PHA (14s Intervento a convegno non pubblicato)
    ALFANO, SARA; SALVATORI, GAIA; MARCHETTI, ANGELA; VILLANO, MARIANNA; MARTINELLI, ANDREA
  • 11573/1688732 - 2023 - Coupled Biological and Thermochemical Process for Plastic Waste Conversion into Biopolymers (01a Articolo in rivista)
    MARZULLI, FLAVIA; DE CAPRARIIS, BENEDETTA; DE FILIPPIS, PAOLO; MARCHETTI, ANGELA; MAJONE, MAURO; VILLANO, MARIANNA
  • 11573/1669564 - 2023 - Biotic transformation products of sulfonamides in environmental water samples. High-resolution mass spectrometry-based tentative identification by a suspect screening approach (01a Articolo in rivista)
    MONTONE, CARMELA MARIA; GIANNELLI MONETA, BENEDETTA; AITA, SARA ELSA; CAPRIOTTI, ANNA LAURA; CERRATO, ANDREA; LAGANA', ALDO; MARCHETTI, ANGELA; PIOVESANA, SUSY; VILLANO, MARIANNA; CAVALIERE, CHIARA
  • 11573/1304425 - 2019 - Continuous removal of Cr(VI) by lab-scale fixed-bed column packed with chitosan-nanomagnetite particles (01a Articolo in rivista)
    VUPPALA, NAGA VENKATA SRIKANTH; MARCHETTI, ANGELA; CIANFRINI, CLAUDIO; STOLLER, MARCO
  • 11573/1304421 - 2019 - On the effect of specific boundary flux parameters on membrane process design (01a Articolo in rivista)
    STOLLER, MARCO; MARCHETTI, ANGELA
  • 11573/1304429 - 2019 - Design of novel equipment capable to quickly produce efficient nanomaterials for use in environmental and sanitary emergencies (01a Articolo in rivista)
    STOLLER, MARCO; VUPPALA, NAGA VENKATA SRIKANTH; MARCHETTI, ANGELA; CHIAVOLA, AGOSTINA
  • 11573/1568118 - 2019 - On the micromixing behavior of a spinning disk reactor for metallic Cu nanoparticles production (01a Articolo in rivista)
    MARCHETTI, ANGELA; STOLLER, MARCO
  • 11573/1637030 - 2021 - “Insights in the electro-fermentation process with 13C-labelled experiments supported by NMR spectroscopy analysis” (14s Intervento a convegno non pubblicato)
    SALVATORI, GAIA; SCIUBBA, FABIO; GIAMPAOLI, OTTAVIA; MARCHETTI, ANGELA; MICCHELI, ALFREDO; MAJONE, MAURO; VILLANO, MARIANNA
  • 11573/1654327 - 2022 - Characterization of MMC-produced PHAs with tailored chemical composition (14s Intervento a convegno non pubblicato)
    ALFANO, SARA; SALVATORI, GAIA; MARCHETTI, ANGELA; VILLANO, MARIANNA; MARTINELLI, ANDREA
  • 11573/1654473 - 2022 - Characterization of MMC-produced PHAs with tailored chemical composition (14s Intervento a convegno non pubblicato)
    ALFANO, SARA; SALVATORI, GAIA; MARCHETTI, ANGELA; VILLANO, MARIANNA; MARTINELLI, ANDREA
  • 11573/1637350 - 2022 - Electro-fermentation: sustainable bioproductions steered by electricity (01a Articolo in rivista)
    MARCHETTI, ANGELA; VILLANO, MARIANNA
  • 11573/1666113 - 2022 - Polyhydroxyalkanoates production by mixed microbial cultures in sequencing batch reactors operated under different feeding conditions (01a Articolo in rivista)
    MARCHETTI, ANGELA; LORINI, LAURA; SALVATORI, GAIA; MAJONE, MAURO; VILLANO, MARIANNA
  • 11573/1662667 - 2022 - Influence of monomeric composition on properties of MMC-produced polyhydroxyalkanoates (14s Intervento a convegno non pubblicato)
    ALFANO, SARA; MARCHETTI, ANGELA; MARTINELLI, ANDREA; SALVATORI, GAIA; VILLANO, MARIANNA
  • 11573/1673440 - 2022 - COMBINING MIXED CULTURE-BASED POLYHYDROXYALKANOATES PRODUCTION WITH MICROBIAL ELECTROCHEMICAL TECHNOLOGIES (14s Intervento a convegno non pubblicato)
    SALVATORI, GAIA; MARCHETTI, ANGELA; NGUEMNA TAYOU, LIONEL; MAJONE, MAURO; VILLANO, MARIANNA
  • 11573/1673441 - 2022 - Electrochemically-steered processes for polyhydroxyalkanoates production with mixed microbial cultures (14s Intervento a convegno non pubblicato)
    SALVATORI, GAIA; MARCHETTI, ANGELA; GIAMPAOLI, OTTAVIA; SCIUBBA, FABIO; MICCHELI, ALFREDO; VILLANO, MARIANNA

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