Effect of sulfide to nitrate ratios on the simultaneous anaerobic sulfide and nitrate removal
Effect of sulfide to nitrate ratios on the simultaneous anaerobic sulfide and nitrate removal
复制标题
DOI：
10.1016/j.biortech.2007.10.053
复制
发表时间：
2008-09-01
影响因子：
11.4
通讯作者：
Mahmood, Qaisar
中科院分区：
文献类型：
--
作者：
Jing, Cai;Ping, Zheng;Mahmood, Qaisar
本研究探讨了硫氮摩尔比（S/N）对同时厌氧除硫脱氮工艺的处理能力、稳定性和选择性的影响。当S/N摩尔比为5：2时，硫化物-硫和硝酸盐-氮的体积去除率分别为4.86 kg（m3·d）（-1）和0.99 kg（m3·d）（-1），高于S/N摩尔比为5：5和5：8时的去除率。此外，在S/N比为5：2的出水波动小于在其他两个测试的比例。在操作过程中，转化的硫化物与转化的硝酸盐的比率趋于接近5：2。当S/N摩尔比设定为5：2而不是5：5或5：8时，元素硫和二氮的选择性得到改善。如果进水硫化物超过其临界浓度，则该过程变得不稳定。还分析了不同S/N摩尔比下反应物之间的电子平衡。(C)2007爱思唯尔有限公司版权所有。
Present investigation deals with the effect of sulfide to nitrate (S/N) molar ratio on the simultaneous anaerobic sulfide and nitrate removal on capacity, stability and selectivity of the process. The volumetric sulfide-sulfur and nitrate-nitrogen removal rates at molar S/N ratio of 5:2 were 4.86 kg (m(3) d)(-1) and 0.99 kg ( m(3) d)(-1), respectively, which were higher than those at S/N molar ratios of 5:5 and 5:8. Moreover, the fluctuations in the effluent at S/N ratio of 5:2 were less than those at the other two tested ratios. During the operation, the ratio of converted sulfide to converted nitrate tended to approach 5:2. The selectivity for elemental sulfur and dinitrogen was improved when the S/N molar ratio was set at 5:2 rather than 5:5 or 5:8. The process became unstable if the influent sulfide surpassed its critical concentration. The electron balance between reactants was also analyzed for different S/N molar ratios. (C) 2007 Elsevier Ltd. All rights reserved.