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|Title:||Long-term operation of a two-stage polyhydroxyalkanoates production process from hardwood sulphite spent liquor|
Lemos, Paulo C.
Serafim, Luisa S.
|Keywords:||MIXED MICROBIAL CULTURES|
SEQUENCING BATCH REACTOR
|Abstract:||BACKGROUNDThe development of sustainable industrial processes demands the recovery and transformation of their by-products. The production of polyhydroxyalkanoates (PHAs) by mixed microbial cultures (MMC) is one of the available routes. This study evaluated the possibility of applying a two-step PHAs production process using an industrial by-product, hardwood sulphite spent liquor (HSSL), as feedstock for a MMC. The first step consisted in the selection of PHAs-storing microorganisms using an aerobic dynamic feeding strategy followed by a second step, accumulation. RESULTSThe selected MMC, despite not being able to use the main carbon source of HSSL, lignosulphonates, revealed the capacity to consume acetate and xylose to accumulate poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and glucose biopolymer. The maximum PHAs content was relatively low, 6.6%, with a maximum production yield of 0.49 C-mmol HA C-mmol S-1 during the selection stage. CONCLUSIONA MMC was able to adapt to HSSL by consuming acetate and xylose. The imposed operational conditions resulted in a partial selection of the culture, since only acetate-consuming organisms experienced a real feast/famine regime, resulting in low PHAs production. (c) 2015 Society of Chemical Industry|
|Appears in Collections:||CICECO - Artigos|
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|Long-term operation of a two-stage polyhydroxyalkanoates production process from hardwood sulphite spent liquor_10.1002jctb.4841.pdf||508.76 kB||Adobe PDF|
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