An urban biorefinery for food waste and biological sludge conversion into polyhydroxyalkanoates and biogas

Moretto, Giulia; Russo, Ivan; Bolzonella, David; Pavan, Paolo; Majone, Mauro; Valentino, Francesco

doi:10.1016/j.watres.2019.115371

Cited by 130 publications

(59 citation statements)

References 42 publications

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“…At the end of this phase, PHA-rich biomass was collected, stabilized, stored, and finally addressed to the extraction/purification steps. The total mass yield was equal to 7.6% gPHA/g volatile solids (VS) [27].…”

Section: Pha Production and Extractionmentioning

confidence: 99%

Polychlorinated Biphenyl Profile in Polyhydroxy-alkanoates Synthetized from Urban Organic Wastes

et al. 2020

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The microbial synthesis of polyhydroxyalkanoates (PHA) from organic wastes is a valuable process to valorize available renewable resources, such as food wastes and biological sludge. Bioplastics find many applications in various sectors, from medical field to food industry. However, persistent organic pollutants could be transferred from wastes to the final product. The present paper demonstrates that the use of municipal wastes in PHA production is safe for the environment and human health and provides a polychlorinated biphenyl (PCB) profile in both commercial and waste-based PHA samples. PCB analysis in several PHA samples showed very low concentrations of the target analytes. Commercial PHA samples showed a similar PCB level with respect to PHA samples from municipal waste/sludge and higher than PHA samples from fruit waste. For all analyzed PCBs, detected concentrations were consistently lower than the ones reported in regulatory framework or guidelines.

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Section: Pha Production and Extractionmentioning

confidence: 99%

Polychlorinated Biphenyl Profile in Polyhydroxy-alkanoates Synthetized from Urban Organic Wastes

et al. 2020

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“…The transformation of low value waste materials such as municipal solid waste (MSW) into renewable chemicals, energy and biofuels, supports the development of a circular economy model by closing the waste loop and meeting the EU Strategy (COM (2015) 80 final) goals (Moretto et al, 2020;Scarlat et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Across the EU there are already over 17,000 biogas digesters and Italy, one of the leading countries in this respect with its 1,500 AD operating units, could have a great potential for the utilization of a biorefinery chain in the urban scenario (Moretto et al, 2020). AD is a well-known and established strategy for the treatment of organic waste.…”

Section: Introductionmentioning

confidence: 99%

Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

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et al. 2020

Bioresource Technology

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A simple biorefinery aimed at producing both biomethane (CH4) and polyhydroxyalkanoates (PHAs), was proposed to valorize the organic fraction of municipal solid waste (OFMSW). Anaerobic digestion (AD) was tested at different organic loading rates (OLR-I-II-III) (i.e. 3, 4 and 6 g L-1 d-1 , respectively), producing biomethane and volatile fatty acids (VFAs)-rich digestate, the VFAs were then used to produce PHAs. Specific biogas and CH4 production remained similar when adopting different OLRs (biogas of 522-600 NL kg-1 VS and CH4 of 64-67% v/v). VFAs concentrated with OLR increases and their patterns were modified. PHA production was in the range of 117-199 g kg-1 OFMSWTS with the lowest production being associated to different polymer composition.

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“…Mixed microbial consortia are promising for accumulating PHAs because of their potential in using low-cost waste streams as substrates like wastewater, crude palm kernel oil, used cooking oil, cheese whey, and coffee grounds, as well as swine waste liquor [10,[13][14][15][16][17]. After hydrolysis and acidogenic fermentation, most organic waste streams contain mixtures of (volatile) fatty acids, such as acetic acid, propionic acid, butyric acid, valeric acid, and hexanoic acid [18,19]. These fatty acids are perfect substrates for the production of PHAs, that consist of the polymerized hydroxylated fatty acid monomers.…”

Section: Introductionmentioning

confidence: 99%

Thauera aminoaromatica MZ1T Identified as a Polyhydroxyalkanoate-Producing Bacterium within a Mixed Microbial Consortium

et al. 2020

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Polyhydroxyalkanoates (PHAs) form a highly promising class of bioplastics for the transition from fossil fuel-based plastics to bio-renewable and biodegradable plastics. Mixed microbial consortia (MMC) are known to be able to produce PHAs from organic waste streams. Knowledge of key-microbes and their characteristics in PHA-producing consortia is necessary for further process optimization and direction towards synthesis of specific types of PHAs. In this study, a PHA-producing mixed microbial consortium (MMC) from an industrial pilot plant was characterized and further enriched on acetate in a laboratory-scale selector with a working volume of 5 L. 16S-rDNA microbiological population analysis of both the industrial pilot plant and the 5 L selector revealed that the most dominant species within the population is Thauera aminoaromatica MZ1T, a Gram-negative beta-proteobacterium belonging to the order of the Rhodocyclales. The relative abundance of this Thauera species increased from 24 to 40% after two months of enrichment in the selector-system, indicating a competitive advantage, possibly due to the storage of a reserve material such as PHA. First experiments with T. aminoaromatica MZ1T showed multiple intracellular granules when grown in pure culture on a growth medium with a C:N ratio of 10:1 and acetate as a carbon source. Nuclear magnetic resonance (NMR) analyses upon extraction of PHA from the pure culture confirmed polyhydroxybutyrate production by T. aminoaromatica MZ1T.

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An urban biorefinery for food waste and biological sludge conversion into polyhydroxyalkanoates and biogas

Cited by 130 publications

References 42 publications

Polychlorinated Biphenyl Profile in Polyhydroxy-alkanoates Synthetized from Urban Organic Wastes

Polychlorinated Biphenyl Profile in Polyhydroxy-alkanoates Synthetized from Urban Organic Wastes

Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

Thauera aminoaromatica MZ1T Identified as a Polyhydroxyalkanoate-Producing Bacterium within a Mixed Microbial Consortium

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