Purification of Eutrophic River Water Using a Biological Aerated Filter with Functional Filler

摘要

Biological aerated filter was used to treat eutrophic river water at different filler mass ratio and temperature on the removal of contaminants. The filter contained a functional composite filler which was made of activated iron and ceramsite. The results showed that the reactor was stable after 30 days of start-up at room temperature and that the proportion of filler mass exerted little effect on COD removal. At different temperatures, the denitrification and phosphorus removal capacity of reactor #1 was better than that of reactor #2, in which the composite filler with an activated iron and ceramsite mass ratio was 1:1(reactor #1) and 1:3 (reactor #2). At 10 degrees C, both reactor #1 and # 2 had removed COD, TN and TP effectively. The relative abundance of species and the diversity of microorganisms in reactor #1 were higher than those in reactor #2. According to the analysis at the phylum and the genus level, bacteria with nitrification and denitrification functions in #1 and #2 were dominant and the proportion of activated iron affected the distribution of microbial population.