The effect of salinity on nitrite accmulation in a DHS reactor
The effect of salinity on nitrite accmulation in a DHS reactor
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盐度对 DHS 反应器中亚硝酸盐积累的影响
DOI：
10.1002/jctb.3770
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发表时间：
2012
影响因子：
3.4
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
1.Natori;T.;Takemura;Y.;Harada;H.;Abe;K.;Ohashi;A.;Kimura;M.;Yamagichi;T.;Okubo;T. and Uemura;S.
背景：通过1400d以上的长期连续实验，评价了盐度对下行悬挂式海绵反应器中亚硝酸盐积累的诱导作用。结果：进水盐度控制在0~25gCl−L−1。随着盐度的增加，出水亚硝酸盐浓度增加。即出水中亚硝酸盐占总氮的比例从0 g Cl−L−1时的1.6%增加到25 g Cl−L−1时的87.6%。荧光原位杂交(FISH)分析表明，随着盐度的增加，DHS中的硝化细菌群落在物种水平上发生了显著变化。特别是，优势亚硝酸氧化细菌从0gC l−L−1亚种转变为亚硝化细菌。在15g氯离子−L−1。在25g氯离子−L−1中，没有检测到亚硝酸氧化细菌。结论：DHS反应器适用于低成本的亚硝酸盐生产过程，盐度控制是一种有效的诱导亚硝酸盐积累的方法。版权所有©2012中国化学工业学会
BACKGROUND:In this study, the inductive effect of salinity on nitrite accumulation in a down‐flow hanging sponge (DHS) reactor, developed as a novel and cost‐effective wastewater treatment process, was evaluated by conducting a long‐term continuous experiment lasting more than 1400 days.RESULTS:The influent salinity was controlled by adding NaCl at concentrations ranging from 0 to 25 g Cl−L−1. The effluent nitrite increased with increases in salinity, i.e. the fraction of nitrite to total nitrogen in the effluent increased from 1.6% at 0 g Cl−L−1to 87.6% at 25 g Cl−L−1. Fluorescencein situhybridization (FISH) analysis revealed that as salinity increased, the nitrifying bacterial community in the DHS changed markedly at the species level. In particular, the dominant nitrite‐oxidizing bacteria changed fromNitrospira‐sublineage I at 0 g Cl−L−1toNitrobacterspp. at 15 g Cl−L−1. At 25 g Cl−L−1, no nitrite‐oxidizing bacteria were detected.CONCLUSION:Our findings suggest that the DHS reactor is suitable for cost‐effective nitrite production processes and that salinity control using NaCl is an effective method for inducing nitrite accumulation. Copyright © 2012 Society of Chemical Industry