Mixed culture resource recovery from industrial waste glycerin pitch: Microbial analysis and production of bio-flocculants extracellular polymeric substances

Ng, Wai Lun; Chua, Adeline Seak May; Low, Jiun Hor; Yoon, Li Wan

doi:10.1016/j.cej.2024.149074

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Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.149074

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Mixed culture resource recovery from industrial waste glycerin pitch: Microbial analysis and production of bio-flocculants extracellular polymeric substances

Wai Lun Ng,

Adeline Seak May Chua,

Jiun Hor Low

et al.

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Cited by 2 publications

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Novel biostimulant bacterial exopolysaccharides production via solid-state fermentation as a valorisation strategy for agri-food waste

Garcia-Muchart,

Martínez-Avila,

Mejias

et al. 2024

Environ Sci Pollut Res

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Bacterial exopolysaccharides (EPS) are extracellular polymer-based substances recently defined as potential plant biostimulants, as they can increase nutrient uptake, water retention, and resistance to abiotic stress. As sugar-based substances, the bacteria producing them need to grow in a sugar-rich substrate. Hence, some agri-food by-products could be used as suitable carbon sources for EPS production as a cost-effective and more sustainable alternative to conventional substrates. Thus, this study aimed to produce EPS from specific bacterial strains through solid-state fermentation (SSF) using agri-food waste as a low-cost substrate. Six residues and five bacterial strains were tested in a lab-scale SSF system. From the assessed substrate-strain combinations, Burkholderia cepacia with ginger juice waste (GJW) resulted in the most promising considering several process parameters (EPS production, cumulative oxygen consumption, biomass growth, reducing sugars consumption). Also, dynamic monitoring of the system allowed for establishing 5 days as a suitable fermentation time. Then, using response surface methodology (Box-Behnken design), the process was optimised based on airflow rate (AF), inoculum size (IS), and micronutrient concentration (MN). In this stage, the best conditions found were at 0.049 (± 0.014) L h−1 per gram of dry matter (DM) for AF, 8.4 (± 0.9) E + 09 CFU g−1 DM for IS, and 0.07 (± 0.01) mL g−1 DM for MN, reaching up to 71.1 (± 3.2) mg crude EPS g−1 DM. Results show the potential of this approach to provide a new perspective on the value chain for the agri-food industry by introducing it to a circular economy framework.

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Novel biostimulant bacterial exopolysaccharides production via solid-state fermentation as a valorisation strategy for agri-food waste

Garcia-Muchart,

Martínez-Avila,

Mejias

et al. 2024

Environ Sci Pollut Res

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Removal and recovery of nitrogen from anaerobically treated leachate based on a neglected HNAD nitrogen removal pathway: NH3 stripping

An,

Gao,

et al. 2024

Bioresource Technology

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Mixed culture resource recovery from industrial waste glycerin pitch: Microbial analysis and production of bio-flocculants extracellular polymeric substances

Cited by 2 publications

References 72 publications

Novel biostimulant bacterial exopolysaccharides production via solid-state fermentation as a valorisation strategy for agri-food waste

Novel biostimulant bacterial exopolysaccharides production via solid-state fermentation as a valorisation strategy for agri-food waste

Removal and recovery of nitrogen from anaerobically treated leachate based on a neglected HNAD nitrogen removal pathway: NH3 stripping

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