AI Article Synopsis
- The lactic acid fermentation supernatant from food waste (FSFW-LA) serves as an effective and cost-efficient carbon source for denitrification.
- The study developed five types of liquid carbon sources, with FSFW-LA achieving a concentration of 68.1 g/L lactic acid, which competes well with sodium acetate in denitrification performance.
- Long-term experiments showed that adding FSFW-LA to a Sequential Batch Reactor (SBR) system resulted in excellent removal rates of total nitrogen (96%) and chemical oxygen demand (84%) in wastewater, highlighting its potential for economic carbon source production.
Article Abstract
The lactic acid fermentation supernatant of food waste (FSFW-LA) is an excellent carbon source for denitrification regarding performance and cost. Currently, limited attention has been paid to the concentration of lactic acid and its composition in the final product. In this study, five types of liquid carbon sources were obtained under optimal conditions to ensure a high concentration and percentage of the target products. Among them, FSFW-LA reached 68.1 g/L (81.8 %, w/w) of lactic acid by oriented bioconversion and possessed denitrification parameters closest to sodium acetate. Under the combined long-term operation of the SBR system with domestic wastewater, the TN and COD removal in the effluent after the addition of FSFW-LA stabilized at 96 % and 84 %, respectively, similar to sodium acetate (96 % and 85 %). Overall, the denitrification capabilities of high-quality FSFW-LA were explored, providing details on economic carbon source production.
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| http://dx.doi.org/10.1016/j.biortech.2024.131739 | DOI Listing |
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