China is facing environmental problems due to massive growth of coal gasification industries. Biological treatment process is the core process for coal gasification wastewater treatment, in which microbial communities play major role in pollutant removal. However, the microbial communities in biological process for coal gasification wastewater treatment remained elusive. Therefore, this research focused on microbial communities in two experimental systems(fixed carrier anoxic/oxic-MBR), which were tested fo...