初始pH值对废水反硝化脱氮的影响  

The Impacts of Initial pH on Wastewater Denitrification

作　　者：赵樑[1] 倪伟敏[1] 贾秀英[1] 周霞[1] 

机构地区：[1]杭州师范大学生命与环境科学学院,浙江杭州310036

出　　处：《杭州师范大学学报（自然科学版）》2014年第6期616-622,共7页Journal of Hangzhou Normal University(Natural Science Edition)

基　　金：国家863计划子课题(2011AA060801-6);浙江省新苗计划项目(2014R421056)

摘　　要：为探讨pH值对硝态氮反硝化体系的影响，设定初始pH范围为4-10，对反硝化过程中NO3-N、NO2-N、TN、TOC和△TOC/△TN的变化规律、反硝化动力学以及抑制机理进行研究. 结果发现：最适宜的反硝化pH值为8，过酸过碱都不利于反硝化过程的进行. 在pH=8时，反应时间最短，硝态氮的去除率为99.4%，TN的降解率为95.5%. 亚硝态氮积累量在pH〈7时小于1 mg/L；pH〉7时，随pH的增大而增大，最大积累率为22%. 硝态氮比反硝化速率在pH=8时最大，为2.52 mg NOx-N/（g MLVSS·h）；亚硝态氮比反硝化速率在pH=7时最大，为1.66 mg NOx-N/（g MLVSS·h）. 因此，反硝化最佳的pH值为7～8.In order to study the impacts of different initial pH on nitrate denitrification system,the paper set the initial pH value from 4to 10,and studied the change rules of NO-3-N,NO-2-N,TN,TOC and△TOC/△TN in the denitrification process,denitrification dynamics and inhibiting mechanism of denitrification.It was found that the most optimal denitrifying condition was pH=8.The value of pH was not conducive to the denitrification process,if it was bigger or smaller.When pH=8,the reaction time was the shortest,the nitrate removal rate was 99.4% and the maximum degradation rate of TN was 95.5%.The accumulation of nitrite was less than 1 mg/L when pH7,when pH7,the nitrite accumulation rate increased with the increase of pH,the greatest accumulation rate was 22%.The maximum special denitrification rate of nitrate was 2.52（mg NO-x-N）/（g MLVSS·h）when pH=8,while the maximum special denitrification rate of nitrite was1.66（mg NO-x-N）/（g MLVSS·h）when pH=7.Therefore,the optimum pH of denitrification was 7-8.

关 键 词：PH 厌氧反硝化 比反硝化速率 抑制机理 

分 类 号：X703.1[环境科学与工程—环境工程]