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The production of volatile fatty acids (VFAs) from waste stream has been recently getting attention as a cost-effective and environmentally friendly approach in mechanical–biological treatment plants. This is the first study to explore the use of a functional bacterium, AM5 isolated from forest soil, which is capable of enhancing the production of VFAs in the presence of soil bacteria as a co-digester in non-strict anaerobic fermentation processes of food waste leachates. Batch laboratory-scale trials were conducted under thermophilic conditions at 55 °C and different pH values ranging from approximately 5 to 11, as well as under uncontrolled pH for 15 days. Total solid content (TS) and volatile solid content (VS) were observed with 58.42% and 65.17% removal, respectively. An effluent with a VFA concentration of up to 33,849 mg/L (2365.57 mg/g VS; 2244.45 mg/g chemical oxygen demand (COD)-VFA VS; 1249 mg/g VSremoved) was obtained at pH 10.5 on the second day of the batch culture. The pH resulted in a significant effect on VFA concentration and composition at various values. Additionally, all types of VFAs were produced under pH no-adjustment (approximately 5) and at pH 10.5. This research might lead to interesting questions and ideas for further studies on the complex metabolic pathways of microbial communities in the mixture of a soil solution and food waste leachate.
Van Hong Thi Pham; Jeongyoon Ahn; Jaisoo Kim; Sangbeom Lee; Ingyu Lee; Sungchul Kim; Soonwoong Chang; Woojin Chung. Volatile Fatty Acid Production from Food Waste Leachate Using Enriched Bacterial Culture and Soil Bacteria as Co-Digester. Sustainability 2021, 13, 9606 .
AMA StyleVan Hong Thi Pham, Jeongyoon Ahn, Jaisoo Kim, Sangbeom Lee, Ingyu Lee, Sungchul Kim, Soonwoong Chang, Woojin Chung. Volatile Fatty Acid Production from Food Waste Leachate Using Enriched Bacterial Culture and Soil Bacteria as Co-Digester. Sustainability. 2021; 13 (17):9606.
Chicago/Turabian StyleVan Hong Thi Pham; Jeongyoon Ahn; Jaisoo Kim; Sangbeom Lee; Ingyu Lee; Sungchul Kim; Soonwoong Chang; Woojin Chung. 2021. "Volatile Fatty Acid Production from Food Waste Leachate Using Enriched Bacterial Culture and Soil Bacteria as Co-Digester." Sustainability 13, no. 17: 9606.
Waste stream has well known as a best option for biorefinery process as it effectively mitigates the organic amount to produces biogas as a renewable and an alterative energy. Volatile Fatty Acids (VFAs) are huge valuable sources for the chemical industry as the precursors of reduced chemicals and derivatives. On the other hand, they have well known as the substrates for bio-fuel production like methane and hydrogen. Thus, the aim of this study is to isolate a pure specific bacterial strains from a variety of sources such as soil, wastewater and food waste leachate that play a crucial role in VFAs degradation and production. In this study, twenty bacterial strains isolated from soil and waste samples were tested in presence of VFAs components concluding acetic acid, butyric acid and propionic acid at 35 °C in four periods: 1-day, 5-day, 10-day and 15-day incubations. Consequently, eight strains illustrated strong growth in the mineral salt media containing VFAs components after 15 days. Four strains out of eight have been found as producing VFAs bacterial candidates. These strains later were tested back in the Food Waste Leachate as a substrate for carbon and energy sources at the same operational conditions. Moreover, there are other four strains which have been explored from the other group chosen for an examination of VFA degradation. After determining potential VFAs consuming and producing candidates, a consortium has been screening for accelerating and optimizing the gas production in the next study at variety of operation conditions.
Van Ht Pham; Sw Chang. Exploring the Effect of Specific Bacterial Strains on the Degradation and Production of Volatile Fatty Acids from Food Waste Leachate. IOP Conference Series: Earth and Environmental Science 2020, 435, 012014 .
AMA StyleVan Ht Pham, Sw Chang. Exploring the Effect of Specific Bacterial Strains on the Degradation and Production of Volatile Fatty Acids from Food Waste Leachate. IOP Conference Series: Earth and Environmental Science. 2020; 435 (1):012014.
Chicago/Turabian StyleVan Ht Pham; Sw Chang. 2020. "Exploring the Effect of Specific Bacterial Strains on the Degradation and Production of Volatile Fatty Acids from Food Waste Leachate." IOP Conference Series: Earth and Environmental Science 435, no. 1: 012014.