Coupling of polyhydroxyalkanoate production with volatile fatty acid from food wastes and excess sludge |
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| Institution: | 1. Department of Chemistry, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy;2. Department of Civil, Chemical, Environmental and Materials Engineering, Alma Mater Studiorum, University of Bologna, Via Terracini 28, 40131 Bologna, Italy;1. REQUIMTE/CQFB, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;2. IBET, Apartado 12, 2781-901 Oeiras, Portugal;1. Dept. of Chemistry, “Sapienza” University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy;2. AnoxKaldnes AB, Klosterängsvägen 11A, 226 47, Lund, Sweden;3. The University of Queensland, Brisbane Queensland, 4072 Australia;1. AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden;2. Dept. of Biotechnology and Biosystems, Veolia Recherche et Innovation (VERI) – Centre de Recherche de Maisons Laffitte, Chemin de la Digue – BP 76, 78603 Maisons-Laffitte, France;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan |
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| Abstract: | In this paper, the synthesis of polyhydroxyalkanoates (PHAs) by activated sludge with aerobic dynamic feeding process was conducted in a sequencing batch reactor by using food wastes and excess sludge fermentation liquid as the carbon source. The volatile fatty acids (VFAs) in the fermentation liquid were divided into even-numbered (acetic and butyric acid) and odd-numbered (propionic and valeric acid). The experiments conducted by central-composite design (CCD) showed that the pH could significantly affect the ratio of even-numbered to odd-numbered VFAs. Statistical analysis indicated a positive correlation (R2 = 0.97, P < 0.05) between the consumption of even-numbered VFAs and the synthesized of PHB, while the consumption of odd-numbered VFAs were correlated with the synthesized PHV. By controlling the ratio of even-numbered to odd-numbered VFAs, the contents of PHV in the PHAs could be controlled within the range of 22–30%. When fermentative VFAs were used as the substrate for the synthesis of PHAs, the microbial synthesis of PHA and biomass was higher than that mixture of analytically pure acids was used. These results are of vital significance for the comprehensive utilization of solid wastes. |
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