蠕虫床污泥减量对A²O-MBR系统中细菌特性的影响

Worm predation is one of the most promising sludge reduction technologies, with the advantages of high efficiency and environmental friendliness. In order to investigate the effects of worm predation on the bacterial characteristics of the wastewater treatment process, a combined system of an anaerobic-anoxic-oxic-membrane bioreactor (A²O-MBR) and worm reactor was established. A conventional A²O-MBR and a combined system of A²O-MBR and blank worm reactor were established as two control systems. The bacterial characteristics of three systems were analyzed by high-throughput sequencing of the 16S rRNA gene after 120 days stable operation. The results showed that the microbe richness increased while the diversity decreased in the A²O-MBR-worm reactor system, which promoted the enrichment of the dominant bacteria. In the combined system, the functional bacteria for nitrogen and phosphorus removal were enriched, of which the abundance of denitrifying phosphorus removal bacteria reached 12.71%, and the synergistic removal of nitrogen and phosphorus occurred. The combination of worm predation improved the removal efficiencies of nitrogen and phosphorus in A²O-MBR system. This study provided an efficient approach for practical application of worm predation for sludge reduction and wastewater treatment.