AI Article Synopsis
- Researchers explored using fungal fermentation, specifically Aspergillus niger, to treat hydrothermal liquefaction aqueous phase (HTLAP) from corn stover, showing its ability to tolerate HTLAP and produce oxalic acid.
- A co-culture of A. niger and Rhodococcus jostii effectively removed 69% of chemical oxygen demand (COD) at a lower loading, while also generating oxalic acid and microbial biomass with lipid content.
- At higher COD levels, while R. jostii struggled, A. niger thrived and increased oxalic acid production without significantly affecting COD removal, demonstrating the potential for converting HTLAP into valuable products.
Article Abstract
To promote the sustainability of hydrothermal liquefaction (HTL) for biofuel production, fungal fermentation was investigated to treat HTL aqueous phase (HTLAP) from corn stover. The most promising fungus, Aspergillus niger demonstrated superior tolerance to HTLAP and capability to produce oxalic acid as a value-added product. The fungal-bacterial co-culture of A. niger and Rhodococcus jostii was beneficial at low COD (chemical oxygen demand) loading of 3800 mg/L in HTLAP, achieving 69% COD removal while producing 0.5 g/L oxalic acid and 11% lipid content in microbial biomass. However, higher COD loading of 4500, 6040, and 7800 mg/L significantly inhibited R. jostii, but promoted A. niger growth with increased oxalic acid production while COD removal remained similar (58-65%). Additionally, most total organic carbon (TOC) in HTLAP was transformed into oxalic acid, representing 46-56% of the consumed TOC. These findings highlighted the potential of fungi for bio-upcycling of HTLAP into value-added products.
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| http://dx.doi.org/10.1016/j.biortech.2024.131240 | DOI Listing |
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