EFFECT OF OPERATIONAL MODE ON NITROGEN REMOVAL AND MICROBIAL CUMMUNITY IN PROCESS OF SIMULTANEOUS PARTIAL NITRIFICATION AND DENITRIFICATION
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摘要: 采用复合序批式生物膜反应器(HSBBR)处理高盐废水,实现了同步短程硝化反硝化脱氮。考察了运行模式对同步短程硝化反硝化系统COD去除和脱氮性能的影响,利用高通量测序技术分析了微生物群落的变化。结果表明:当反应器以缺氧/好氧交替模式运行时(缺氧/好氧时间比为2.0 h/4.5 h),NH3-N、总无机氮(TIN)和COD去除率分别为95.00%、84.83%和86.72%,出水中含有NO2--N和NO3--N。以完全好氧模式运行时(缺氧/好氧时间比为0.0/6.5 h),NH3-N去除率达到100.00%,TIN和COD去除率分别为85.94%和89.46%,出水中只含有NO2--N。高通量测序结果表明:在门水平上,2种模式下生物膜和悬浮污泥中的优势菌均为变形菌门(Proteobacteria)和拟杆菌门(Bacteroidetes);Nitrosomonas是本研究检测出的唯一氨氧化菌(AOB)属,当反应器由缺氧/好氧交替模式转换为完全好氧模式时,悬浮污泥和生物膜中Nitrosomonas的相对丰度均增加;悬浮污泥和生物膜中优势反硝化菌属相似,包括Candidatus_Competibacter、Paracoccus、Thauera和Denitratisoma,在完全好氧模式下,悬浮污泥和生物膜中Candidatus_Competibacter和Thauera的相对丰度较低,而Paracoccus和Denitratisoma的相对丰度较高。多种反硝化菌与氨氧化菌的共同作用,使反应器能够实现高效同步短程硝化反硝化脱氮。Abstract: In this study, simultaneous partial nitrification and denitrification (SPND) process was successfully established for the treatment of high-salinity wastewater in a hybrid sequencing batch biofilm reactor (HSBBR). The effect of operational mode on the reactor performance and microbial community was investigated. When the reactor was operated in alternating anoxic/aerobic mode (anoxic/aerobic hour ratio was 2.0 h/4.5 h), the removal efficiencies of NH4+-N, total inorganic nitrogen (TIN) and COD were 95.00%, 84.83% and 86.72%, respectively, and the effluent contained nitrite and nitrate. When operational mode was switched to fully aerobic mode (anoxic/aerobic hour ratio was 0.0/6.5 h), removal efficiencies of NH3-N, TIN and COD increased to 100.00%, 85.94% and 89.46%, and nitrate was the only nitrogen component in the effluent. The high-throughput sequencing results showed that the dominant phyla were Proteobacteria and Bacteroidetes in both suspended sludge (S-sludge) and biofilm in two modes. Genus Nitrosomonas was the only ammonia-oxidizing bacteria (AOB) detected in this study and appeared higher relative abundance in S-sludge and biofilm samples in the fully aerobic mode compared to the alternating anoxic/aerobic mode. S-sludge and biofilm shared similar dominant denitrifying bacteria (DNB), including genera Candidatus_Competibacter, Paracoccus, Thauera and Denittrasoma. The relative abundance of Candidatus_Competibacter and Thauera decreased in fully aerobic mode, while Paracoccus and Denitratisoma showed increasing tendency. Multiple DNB genera accompanied by AOB contributed to the efficient nitrogen removal via SPND process.
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