Development of Biodegradable Plastic Production Using Activated Sludge
Polyhydroxyalkanoates (PHAs) are polyesters of hydroxyalkanoates, which are synthesized by numerous bacteria as intracellular carbon and energy storage compounds and accumulated as granules in the cytoplasm of cells. PHAs have been recognized as a sort of new candidates for producing biodegradable plastic. This paper reviews the synthesis of PHAs by use of activated sludge, including the microorganism, carbon sources and synthesis pathway, focusing on PHAs accumulation in anaerobic-aerobic process. It is showed that PHAs content in activated sludge can be improved by rational technology and proper nutritive condition. The study will likely contribute to the present endeavors to ameliorate excess sludge problem.