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Choudhari S.K.,Technology Center for Biorefining and Bioenergy | Choudhari S.K.,Trinity College Dublin | Cerrone F.,Technology Center for Biorefining and Bioenergy | Cerrone F.,University College Dublin | And 8 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

Polyether block amides (PEBA) composite membranes were prepared by dispersing different two dimensional (2D) layered nanomaterials such as graphene, graphene oxide and molybdenum disulphide (MoS2) in PEBA matrix. These composite membranes were applied for the pervaporation separation of butyric acid produced by anaerobic digestion (AD) of perennial grass. Among all the tested membranes PEBA-graphene membrane showed the best performance with butyric acid flux og 24.3g/m2h and separation factor of 21. Further on varying the graphene content in the membranes showed improved separation efficiency with increased thermal and mechanical properties of the membranes. © 2014 The Korean Society of Industrial and Engineering Chemistry.

Cerrone F.,University College Dublin | Cerrone F.,Technology Center for Biorefining and Bioenergy | Duane G.,University College Dublin | Casey E.,University College Dublin | And 11 more authors.
Applied Microbiology and Biotechnology | Year: 2014

A mathematically based fed-batch bioprocess demonstrated the suitability of using a relatively cheap and renewable substrate (butyric acid) for Pseudomonas putida CA-3 high cell density cultivation. Butyric acid fine-tuned addition is critical to extend the fermentation run and avoid oxygen consumption while maximising the biomass volumetric productivity. A conservative submaximal growth rate (μ of 0.25 h−1) achieved 71.3 g L−1 of biomass after 42 h of fed-batch growth. When a more ambitious feed rate was supplied in order to match a μ of 0.35 h−1, the volumetric productivity was increased to 2.0 g L−1 h−1, corresponding to a run of 25 h and 50 g L−1 of biomass. Both results represent the highest biomass and the best biomass volumetric productivity with butyrate as a sole carbon source. However, medium chain length polyhydroxyalkanoate (mcl-PHA) accumulation with butyrate grown cells is low (4 %). To achieve a higher mcl-PHA volumetric productivity, decanoate was supplied to butyrate grown cells. This strategy resulted in a PHA volumetric productivity of 4.57 g L−1 h−1 in the PHA production phase and 1.63 g L−1 h−1over the lifetime of the fermentation, with a maximum mcl-PHA accumulation of 65 % of the cell dry weight. © 2014, Springer-Verlag Berlin Heidelberg.

Cerrone F.,University College Dublin | Cerrone F.,Technology Center for Biorefining and Bioenergy | Davis R.,University College Dublin | Davis R.,Technology Center for Biorefining and Bioenergy | And 11 more authors.
Bioresource Technology | Year: 2015

This study demonstrates the use of a mannitol rich ensiled grass press juice (EGPJ) as a renewable carbon substrate for polyhydroxyalkanoates (PHA) production in shaking flask experiments and fed-batch stirred tank reactor cultivations. Fed-batch cultivations of Burkholderia sacchari IPT101 using EGPJ as sole carbon source produced 44.5. g/L CDW containing 33% polyhydroxybutyrate (PHB) in 36. h, while Pseudomonas chlororaphis IMD555 produced a CDW of 37. g/L containing 10% of medium chain length polyhydroxyalkanoates (mcl-PHA) in 34. h. PHB and mcl-PHA extracted from B. sacchari IPT101 and P. chlororaphis IMD555, grown on EGPJ, had a molecular weight of 548. kg/mol and 115.4. kg/mol, respectively. While mcl-PHA can be produced from EGPJ, PHB production is more interesting as there is a 4-fold higher volumetric productivity compared to mcl-PHA. © 2015 Elsevier Ltd.

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