Abstract: This paper systematically summarizes the research progress of which mixed bacteria produce PHA using substrate from organic wastewater. Generally speaking, mixed bacteria can produce PHA by two ways, AN/AE technology and ADF technology. Domestic researches emphasized the operating conditions in the reactor including the domestication and accumulation. Besides, the researchers extracted the microorganism producing PHA. Foreign researches emphasized the identification of different kinds of microorganism for keeping PHA. Whats more, they studied the influence that different substrates pose to PHA yield and composition and looked for more effective substrate from organic wastewater. Thanks to some technical breakthrough, PHA producing pattern can apply to industrial production. According to the current producing methods, this paper proposes that more reliable microorganism with high PHA storage should be identified and researches should go deep into the role of specific bacteria. Meanwhile, nutrition from the substrate needs to be balanced. Then it should optimize the operating conditions so as to achieve PHA production maximization.

Key words: polyhydroxyalkanoate(PHA); mixed bacteria; organic wastewater