Optimization and regulation effects of microbial community on the efficient degradation of aromatic hydrocarbons

At present, the difficulty of removing aromatic hydrocarbons was the key factor restricting the discharge of industrial wastewater. In this study, the optimization and regulation effects of microbial community on the efficient degradation of aromatic hydrocarbons were investigated. The results indicated that some functional bacteria were selectively enriched under the stress of high molecular weight pyrene, and the relative proportion of key enzymes gene associated with the degradation of aromatic hydrocarbons was significantly increased, as well as the Thauera strain played a central role in the degradation of polycyclic aromatic hydrocarbon substances. Under the optimization of the microbial community, the mineralization rate of naphthalene, phenanthrene, and pyrene was increased by 32.8 %, 34.5 %, and 32.4 %, respectively, and their biotoxicity reduction was also obviously improved. Moreover, the activity of electron transfer system activity (ETSA) and dehydrogenase (DHA) was increased by 1.42-1.75 times and 1.58-3.17 times, respectively. Simultaneously, microbial community optimization obviously promoted the secretion of EPS, which would help to increase their bioavailability. Furthermore, the activity of initial dioxygenase (NDO) and catechol 2,3-dioxygenase (C23O) was increased by 1.28-3.21 times and 1.25-1.77 times, respectively, which would be the essence of the efficient degradation of aromatic hydrocarbons.