Study on dephosphorisation microorganism community of activated sludge in CAST reaction tank
In order to grasp the characteristics of the dephosphorization microbial community structure of the activated sludge in each stage of the CAST reaction tank in Xiashan Water Treat-ment Plant in Zhanjiang,China,the high-throughout sequencing analysis was performed on the ac-tivated sludge at different stages of the CAST reaction tank after DNA extraction.The results indi-cate that the activated sludge at each stage of the CAST reaction tank was rich in dephosphorization bacterial,and it performs efficiently in phosphor removing.The dominant bacterial groups at the phylum level included Proteobacteria、Chloro flexi、Actinobacteriota、Acidobacteriota and Firmi-cutes.The dominant flora at the genus level mainly included Norank_f_Caldilineaceae、Candida-tus_Competibacter、Norank_f_norank_o_Saccharimonadales、Tetrasphaera、Norank_f_Blastoca-tellaceae and so on.The phosphorus accumulating organisms and glycogen accumulating organisms were coexisted in the CAST reaction tank,the relative abundance of these two bacteria were rela-tively high,the competition between the bacteria and the change of the environmental condition will affect the efficiency of the phosphor removal.Due to long-time aeration in main reaction zone,the relative abundance of Tetrasphaera in main reaction zone much higher than the biological selec-tion zone and facultative oxygen zone.The relative abundance of Streptococcus and Acinetobacter in the biological selection zone was much higher than that in the main reaction zone and the facultative oxygen zone.The denitrification phosphorus accumulating bacteria were more suitable for its growth in the anaerobic stage of the biological selection zone,resulting in a higher relative abun-dance,which leads to enhance the phosphorus removal efficiency of this stage.In actual produc-tion,efforts should be made to improve suitable environment to enhance the biomass of phosphorus accumulating bacteria to ensure the phosphorus removal effect.
万方数据
维普
