Microbial community structures in continuous FMBR treating dyestuff wastewater: relationship between community stability and reactor performance

The polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) was used to analyze the stability of microbial community structure in continuous white rot Fungal Membrane Bio-Reactor (FMBR) and the results were interpreted using sophisticated multidimensional scaling (MDS) analysis. The experiment was carried out for 100 days continuously. The results indicate that the Phanerochaete chrysosporium (P. chrysosporium) was identified by sequencing and it was the predominant species in microbial community. Then with the time increasing, the predominant was more and more obvious. The Shannon-Wiener indices of the microbial community at the end of the experiment decreased to 0.92 lower than the average of 1.92. The MDS analysis show that the changes among the microbial communities was relatively stable during the continuous FMBR operation stable. The average rate of decoloration maintained at 82.5% and the maximum rate could reach to 93.2%. The continuous FMBR could decolorize dyestuff wasterwater efficiently during the operation.