标题：MICROBIAL COMMUNITY CHARACTERISTICS AND SHORTCUT NITRIFICATION-DENITRIFICATION UNDER THE INTERMITTENT AERATION PROFILE IN A SBR TREATING SWINE WASTEWATER
摘要：Nitrogen removal processes from the livestock wastewater is becoming more and more important as reduced nitrogen loads can be applied to land due to stringent China regulations. A SBR operating the nitritation / denitritation process was tested for 110 days and the suitable treatment conditions (influent 15min, reaction 480min, precipitation 60min, effluent 15min, idle 810min), the removal efficiency of COD, NH_4~+-N and TN in livestock wastewater in SBR were 89.6%, 97.5% and 70.0%, respectively. Effects of DO concentration on the nitritation rate were also assessed. The lower DO increase the anoxic and anaerobic environment in the reactor, it will inhibit the nitrifying bacteria, which leads to the failure of the NH_4~+-N to be effectively removed. The short nitrification - denitrification was inhibited by excessive aeration, and NO_2~--N was further oxidized to NO_3~--N by the nitrite oxidizing bacteria. When the concentration of DO is 2.0mg/L, the nitrous acid was accumulated. It indicate the appearance of partial denitrification, and the results are similar to the microbial community analysis. Furthermore, Illumina MiSeq sequencing analysis demonstrated that the predominant bacteria were Rhodocyclaceae, Comamonadaceae and Nitrosomonadaceae on the family level, and they were the key to nitrogen removal processes.
