Polyhydroxyalkanoates (PHAs) production was carried out under various C:N ratios. A ratio of 100 resulted best polymer yield. C-source was an important factor in synthesis. For example, as the ratio of valeric acid (C5) to butyric acid (C4) in N-free medium was increased, the mole fraction of HV in the copolymer increased. When soy waste was used as a C-source a copolymer, a high HV mole fraction (HB:HV, 75:25) was produced while when malt waste was used, a much lower HV mole fraction (HB:HV, 90:10) was generated. It was concluded that activated sludge bacteria could be induced to produce PHAs using food wastes as C-sources and this could be the basis for production of biodegradable plastics. Copyright © 2006 Elsevier Ltd. All rights reserved.
carbon nitrogen ratio
CitationWang, Y. J., Hua, F. L., Tsang, Y. F., Chan, S. Y., Sin, S. N., Chua, H., Yu, P. H. F., Ren, N. Q. (2007). Synthesis of PHAs from waste under various C:N ratios. Bioresource Technology, 98(8), 1690-1693.
- Activated sludge