摘要
以模拟焦化废水为对象,分析了不同C/N(m(COD)/m(NO_3^--N))条件下,反硝化过程中NO_2^--N积累及pH和氧化还原电位ORP的变化规律。结果表明:在C/N分别为6、9、13时,pH和ORP变化规律可以表征反硝化过程中NO_2^--N的积累特征,能较好地指示"NO_2^--N积累最大点"和"反硝化真正结束点"。C/N为2.5或17时,碳源不足或碳源过量,反硝化过程指示效果较差。以NO_3^--N+0.6NO_2^--N作为反硝化电子受体,利用修正的能斯特方程对反硝化体系ORP进行模拟,在碳源适中(C/N为6,9)时模拟效果较好,R^2大于0.80,碳源不足或超量时拟合效果一般,R^2小于0.80.
Simulation coking wastewater was used as carbon source to investigate the variations of pH and ORP（oxidation-reduction potential）and NO_2^--N accumulation during denitrification under different C/N（m（COD）/m（NO_3^--N））ratios.Results show that the C/N ratio was 6,9 or 13,the changes of pH and ORP could reflect the variation of NO_2^--N accumulation concentration,and could indicate ＂the maximum points of NO_2^--N accumulation＂and ＂the real end points of denitrification＂well.When C/N ratio was 2.5 or 17,carbon for denitrification was insufficient or excess,the changes of pH and ORP indicated less effective.The main factors of pH were the production of alkali in denitrification and acids of carbon metabolic intermediates.ORP change was more related with the system NO_3^--N,NO_2^--N,COD concentrations.With NO_3^--N＋0.6NO_2^--N as the electronic acceptor of denitrification,revised Nernst Equation could accurately（R2〉0.80）simulate variation of ORP when C/N ratio was 6,9.However,when carbons for denitrification were insufficient or excess,the model could not give good Fitting（R2〈0.80）.
作者
王孝维
薛晖军
岳秀萍
WANG Xiaowei XUE Huijun YUE Xiuping(College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Chin)
出处
《太原理工大学学报》
北大核心
2017年第5期741-746,共6页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目:含氮杂环化合物在厌氧同时反硝化产甲烷体系中的降解性能研究(51378330)
