Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
Bioresour Technol. 2015 Aug;189:302-308. doi: 10.1016/j.biortech.2015.04.006. Epub 2015 Apr 8.
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 1L 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.
在这项研究中，考察了 COD/N 比对亚硝酸盐完全自养脱氮（CANON）过程的影响。五个相同的膜生物反应器同时接种了 1L CANON 污泥，并在相同条件下运行了两个多月，进水 COD/N 比分别为 0、0.5、1、2 和 4。DGGE 用于分析五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，CANON 与低浓度 COD 的反硝化协同作用良好，而过高的 COD 浓度则抑制了 AOB 和 AAOB。随着 COD 的增加，AOB 和 AAOB 的生物多样性均降低，从而导致氮去除效果变差。COD/N 比对于 CANON 的抑制阈值为 1.7。CANON 适用于处理低 COD/N 的污水，而高浓度污水应事先通过厌氧沼气产生工艺进行转化。
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