Production of polyhydroxyalkanoates by activated sludge treating a paper mill wastewater

Bengtsson, Stina; Werker, Alan; Christensson, Magnus; Welander, Thomas

doi:10.1016/j.biortech.2007.01.020

Cited by 325 publications

(171 citation statements)

References 21 publications

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“…To reduce the production cost of PHA and allow broad application, various researchers investigated the use of open microbial communities and waste organic carbon as substrate (Albuquerque et al, 2010;Bengtsson et al, 2008;Coats et al, 2007;Dionisi et al, 2005;Jiang et al, 2012). The process for non-axenic PHA production from organic waste comprises three steps: (1) acidogenic fermentation of the waste stream, (2) enrichment of a PHA-producing culture, and (3) production of the PHA (Dionisi et al, 2004;Serafim et al, 2008).…”

Section: -Or Recombinantmentioning

confidence: 99%

Combining the enrichment and accumulation step in non-axenic PHA production: Cultivation of Plasticicumulans acidivorans at high volume exchange ratios

Marang

Loosdrecht

Kleerebezem

2016

Journal of Biotechnology

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Section: -Or Recombinantmentioning

confidence: 99%

Combining the enrichment and accumulation step in non-axenic PHA production: Cultivation of Plasticicumulans acidivorans at high volume exchange ratios

Marang

Loosdrecht

Kleerebezem

2016

Journal of Biotechnology

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“…The application of open mixed cultures avoids costs in sterilization and simplifies the process control, given that it is designed based on the ecological role of species survival with PHAs. Additionally, agroindustrial wastes and by-products, such as olive oil mill effluents (18), sugar cane molasses (1), or paper mill wastewater (7), may be used as the carbon source (42), rather than refined organic substrates.…”

mentioning

confidence: 99%

Community Structure Evolution and Enrichment of Glycogen-Accumulating Organisms Producing Polyhydroxyalkanoates from Fermented Molasses

Pisco

Bengtsson²,

Werker³

et al. 2009

Appl Environ Microbiol

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An open mixed culture was enriched with glycogen-accumulating organisms (GAOs) by using a sequencing batch reactor and treating an agroindustrial waste (sugar cane molasses) under cyclic anaerobic-aerobic conditions. Over a 1-year operating period, the culture exhibited a very stable GAO phenotype with an average polyhydroxyalkanoate (PHA) content of 17% total suspended solids. However, the GAO microbial community evolved over the course of operation to a culture exhibiting unusual characteristics in producing PHAs comprised of short-chain-length monomers, namely, 3-hydroxybutyrate, 3-hydroxy-2-methylbutyrate, 3-hydroxyvalerate, and 3-hydroxy-2-methylvalerate, and also, up to 31 mol% of the medium-chain-length (MCL) monomer 3-hydroxyhexanoate (3HHx). Microbial community analysis by fluorescence in situ hybridization revealed a concurrent long-term drift in the GAO community balance, from mainly "Candidatus Competibacter phosphatis" to mainly Defluviicoccus vanus-related organisms. The production of 3HHx was confirmed by 13 C nuclear magnetic resonance (NMR) and appeared to be related to the increased presence of D. vanus-related GAOs. These results suggest a broadened spectrum of material, chemical, and mechanical properties that can be achieved for biopolymers produced by open mixed cultures from fermented waste. The increased spectrum of polymer properties brings a wider scope of potential applications.Polyhydroxyalkanoates (PHAs) are biopolymers synthesized by bacteria as intracellular reserves of carbon, energy, and reducing power, with physical properties that make them an attractive source of biobased thermoplastics. These polymers are completely biodegradable and biocompatible and show promise for a broad range of engineering applications, from commodity to high-value-added specialty niche products (27).The most common PHAs are homopolymers of 3-hydroxybutyrate [P(3HB)] and copolymers with, for example, 3-hydroxyvalerate (3HV) [P(3HB-co-3HV)]. The homopolymer P(3HB) is highly crystalline with low impact strength. The copolymer P(3HB-co-3HV) exhibits contrasting mechanical properties, such as lower crystallinity and an increased impact strength and flexibility due to the incorporation of 3HV units. The copolymers with P(3HB) thus exhibit properties that are strongly dependent on the type and content of additional monomer elements. The incorporation of monomers other than 3HV may further extend the scope for PHA applications by tailoring the polymer's mechanical properties (8,17).The industrial production of PHAs is currently conducted using bacterial cultures of pure or recombinant strains that require sterile production conditions and strict process control. This state of the art has a high energy demand and, consequently, high production costs relative to those of, for example, polypropylene. Furthermore, well-defined and expensive substrates, such as glucose or propionic acid, are used as feedstock, contributing even further to the relatively high costs of production (10). As a result and notwithstandin...

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“…The problem that is faced by industry is the high production costs of biopolymers. Biodegradable polymers derived from polyhydroxyalkanoates (PHAs) are considered to be good candidates for biodegradable plastics due to their large range application and capability of being produced from renewable resources (Dionisi et al, 2005;Bengtsson et al, 2008;Albuquerque et al, 2007). These materials have attracted interest because of their potential use as biodegradable alternatives to petroleum-based synthetic plastics such as polypropylene and polyethylene.…”

Section: The Science Of Biopolymermentioning

confidence: 99%

“…Fermented POME composition constitute up to 50% of acetic acid, 30% of butyric acid, and 10% of propionic and lactic acids. Earlier studies have shown that the VFAs (acetic, butyric, propionic, etc) have been used as carbon source by bacteria, as individual or mixed or of the VFAs (Yu, 2003;Dionisi et al, 2005;Bengtsson et al, 2008). Table 10.…”

Section: Cod(l)mentioning

confidence: 99%

Microbial Biopolimerization Production from Palm Oil Mill Effluent (POME)

Ujang¹,

Salmiati²,

Salim³

2010

Biopolymers

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Production of polyhydroxyalkanoates by activated sludge treating a paper mill wastewater

Cited by 325 publications

References 21 publications

Combining the enrichment and accumulation step in non-axenic PHA production: Cultivation of Plasticicumulans acidivorans at high volume exchange ratios

Combining the enrichment and accumulation step in non-axenic PHA production: Cultivation of Plasticicumulans acidivorans at high volume exchange ratios

Community Structure Evolution and Enrichment of Glycogen-Accumulating Organisms Producing Polyhydroxyalkanoates from Fermented Molasses

Microbial Biopolimerization Production from Palm Oil Mill Effluent (POME)

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