Excess sludge of municipal wastewater treatment plant is the solid waste in treatment process of municipal wastewater and industrial wastewater, and the inevitable outcome of the sewage treatment plants. In this study, active sludge systems containing four different dominant organisms were constructed with sludge form sewage treatment plants. With these systems, we studied the influencing factors of producing fully-biodegradable plastic poly-hydroxyalkanoates (PHAs) with different organisms.
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