Effect of COD/N ratio on nitrogen removal and microbial communities of CANON process in membrane bioreactors.
Effect of COD/N ratio on nitrogen removal and microbial communities of CANON process in membrane bioreactors.
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DOI：
10.1016/j.biortech.2015.04.006
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发表时间：
2015-08
影响因子：
11.4
通讯作者：
Xiaojing Zhang;Hongzhong Zhang;Changming Ye;Mingbao Wei;Jingjing Du
中科院分区：
文献类型：
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作者：
Xiaojing Zhang;Hongzhong Zhang;Changming Ye;Mingbao Wei;Jingjing Du
在本研究中，在五个相同的膜生物反应器中研究了 COD/N 比率对亚硝酸盐完全自养脱氮 (CANON) 过程的影响。五个反应器同时接种 1 L CANON 污泥，并在相同条件下运行两个多月，进水 COD/N 比分别为 0、0.5、1、2 和 4。利用DGGE分析了5个反应器中好氧氨氧化菌（AOB）和厌氧氨氧化菌（AAOB）的微生物群落。结果表明，低COD浓度下CANON和反硝化作用协调工作，而过高的COD浓度则抑制AOB和AAOB。 AOB和AAOB生物多样性均随着COD的增加而降低，从而导致脱氮效果恶化。 CANON的COD/N比抑制阈值为1.7。 CANON对于处理低COD/N污水是可行的，而高污水则需要预先通过厌氧沼气生产工艺进行转化。
In this study, the effect of COD/N ratio on completely autotrophic nitrogen removal over nitrite (CANON) process was investigated in five identical membrane bioreactors. The five reactors were simultaneously seeded for 1 L CANON sludge and be operated for more than two months under same conditions, with influent COD/N ratio of 0, 0.5, 1, 2 and 4, respectively. DGGE was used to analyze the microbial communities of aerobic ammonia-oxidizing bacteria (AOB) and anaerobic ammonia-oxidizing bacteria (AAOB) in five reactors. Results revealed the harmonious work of CANON and denitrification with low COD concentration, whereas too high COD concentration suppressed both AOB and AAOB. AOB and AAOB biodiversity both decreased with COD increasing, which then led to worse nitrogen removal. The suppressing threshold of COD/N ratio for CANON was 1.7. CANON was feasible for treating low COD/N sewage, while the high sewage should be converted by anaerobic biogas producing process in advance.