甲醇为碳源短程反硝化亚硝酸盐积累特性

发布时间：2019-03-04 13:06

【摘要】：接种反硝化过程中亚硝态氮(NO_2~--N)积累效果稳定的短程反硝化污泥,以甲醇为碳源,通过批次试验研究了不同碳氮比(C/N)、硝态氮(NO_3~--N)浓度及p H条件下短程反硝化过程中NO_2~--N积累特性.实验结果表明:当C/N为2.5时,NO_2~--N积累率最高为89%,且NO_2~--N不会被还原;当C/N为3~5时,NO_2~--N积累到最大值后开始降低,但NO_2~--N最大积累量和比反硝化速率没有明显差异.当NO_3~--N浓度在14.91~82.58mg/L范围内,NO_3~--N浓度越高,达到NO_2~--N最大积累率理论所需C/N越低.且当NO_3~--N浓度小于58.71mg/L时,比NO_3~--N还原速率、比NO_2~--N积累速率随NO_3~--N浓度增加而上升.当p H=7时,NO_2~--N积累量、比NO_3~--N还原速率和比NO_2~--N积累速率最高,分别为24.49mg/L、18.96(mg/(g VSS·h))、18.91(mg/(g VSS·h)),然后依次是p H=6、8、9.p H=5和10时,短程反硝化基本不能进行.本研究可以为短程反硝化的实现及应用提供理论依据.
[Abstract]:By inoculation of short-range denitrification sludge with stable accumulation of sub-nitrate nitrogen (NO_2~--N) during denitrification, different C / N ratios (C / N) were studied by batch test with methanol as carbon source. The concentration of nitrate nitrogen (NO_3~--N) and the characteristics of NO_2~--N accumulation in the process of short-range denitrification were studied. The experimental results show that the highest accumulation rate of NO_2~--N is 89% when C N is 2.5, and NO_2~--N will not be reduced. When C _ (N) was 3 ~ 5, NO_2~--N accumulated to the maximum value and began to decrease, but there was no significant difference in NO_2~--N maximum accumulation and specific denitrification rate. When the concentration of NO_3~--N is in the range of 14.91~82.58mg/L, the higher the concentration of NO_3~--N is, the lower the C _ (N) required by the theory of maximum accumulation rate of NO_2~--N is. When the concentration of NO_3~--N is less than 58.71mg/L, the specific NO_3~--N reduction rate and the specific NO_2~--N accumulation rate increase with the increase of NO_3~--N concentration. At pH 7, NO_2~--N accumulation, specific NO_3~--N reduction rate and specific NO_2~--N accumulation rate were the highest, which were 24.49 mg / L and 18.96 (mg/ (g VSS 路h), respectively. 18.91 (mg/ (g VSS 路h),) followed by pH 6, 8, 9.p H, 5 and 10:00, short-range denitrification was almost impossible. This study can provide theoretical basis for the realization and application of short-range denitrification.
【作者单位】：北京工业大学国家工程实验室北京市污水脱氮除磷处理与过程控制工程技术研究中心;
【基金】：国家自然科学基金资助项目(51478013) 北京市教委资助项目
【分类号】：X703

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