6.51 – Mixed Culture Processes for Polyhydroxyalkanoate Production from Agro-Industrial Surplus/Wastes as Feedstocks

摘要: Polyhydroxyalkanoates (PHAs) are a group of biologically synthesized polyesters that considered promising eco-efficient bioplastics because they both biobased and biodegradable, thus meeting the criteria closed loop life cycle. In past decades, industrial biotechnology has devoted considerable effort to PHA production by bacterial pure culture fermentation. However, PHAs have not yet entered bulk materials markets due high costs. The combined use mixed microbial cultures (MMCs) low-value feedstocks is currently under investigation in order decrease operating For sake enhanced production, be preliminarily enriched PHA-accumulating organisms. This usually carried out dynamic feeding suitable carbon sources create transient conditions excess lack availability, designated as feast famine. then subsequent accumulation stage. To make waste- surplus-based for acidogenic fermentation used convert their organic fraction into volatile fatty acids, which viable precursors synthesis. main issues three-stage process from using MMCs here described discussed.