期刊
DESALINATION AND WATER TREATMENT
卷 56, 期 3, 页码 598-607出版社
DESALINATION PUBL
DOI: 10.1080/19443994.2014.950336
关键词
Ammonia-oxidizing bacteria; Free ammonia; Free nitrous acid; Nitrite-oxidizing bacteria; Oxygen limitation; Partial nitrification; Reject water
资金
- University-wide internal grant agency-CIGA [20132012]
- Czech Ministry of Education, Youth and Sports [MSM 6046137308]
- Marie Curie Reintegration Grant Biofilms in Bioreactors for Advanced Nitrogen Removal from Wastewater [ERG-2010-268417]
The direct and indirect influence of temporary oxygen limitation on the nitrification of reject water was investigated using a continuous stirred tank bioreactor operated for 330d at laboratory temperature (23 +/- 1 degrees C). A decrease in dissolved oxygen (DO) concentration from 3 to 0.7mgL(-1) lasted for 38d and led to effective nitrite accumulationmore than 95% of total oxidized nitrogen was present as nitrite. The drop of DO concentration, at the same time, caused a decrease in the nitrogen oxidation rate from 1.36 to 0.73kgNm(-3)d(-1). After a subsequent DO concentration increase to 3mgL(-1), the nitrite accumulation remained stable for another 90d. This development was caused mainly by the indirect effects of DO limitation, consisting especially in the change of nitrogen species represented. A significant increase in free nitrous acid concentration induced by temporary DO limitation seems to be the key factor in this respect. The results of Fluorescence in situ hybridization analysis confirmed a washout of nitrite-oxidizing bacteria (NOB) during the period with high nitrite accumulation. The representation of NOB in total biomass decreased from 6.4% to less than 1% as a consequence of temporary DO limitation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据