电子受体及投加方式对内源反硝化及N_(2)O的影响研究

Effect of Electron Acceptors and Dosing Method on Endogenous Denitrification Removal and Nitrous Oxide Emission

以驯化好的内源反硝化污泥为研究对象,通过批式实验考察了不同电子受体及投加方式对内源反硝化及N_(2)O释放的影响。结果表明:当以硝酸盐为电子受体时,系统中N_(2)O的释放极少,而高浓度NO_(3)^(-)-N更有利于NO_(2)^(-)-N的累积。当以亚硝酸盐为电子受体时,NO_(2)^(-)-N会产生FNA从而抑制N_(2)O的还原。当进水NO_(2)^(-)-N为20 mg/L时,NO_(2)^(-)-N降解能力最大为16.81mg。当进水NO_(2)^(-)-N浓度为40 mg/L时,N_(2)^(-)-N转化率最高为,25.38%。在不同的进水方式下,N_(2)O的释放主要发生各分段进水的第一阶段,且脱氮效果与N_(2)O的释放量随着NO_(2)^(-)-N投加次数的增加均降低。

The effects of nitrite and salinity concentration on endogenous enitrification and nitrous oxide release were investigated by batch experiments.The effects of different electron acceptors and dosing methods on endogenous denitrification and nitrous oxide release were investigated by batch experiment.The results show that when nitrate was used as electron acceptor,the release of N_(2)O in the system were infrequent.The high concentration of nitrate was conducive to accumulation of nitrite.When nitrite was used as electron acceptor,nitrite could produce FNA to inhibit the reduction of N_(2)O.When the influent nitrite was 20 mg/L,the maximum degradation capacity of nitrite was 16.81mg.When the influent nitrite concentration was 40 mg/L,the N_(2)^(-)-N conversion rate was the highest,25.38%.Under different dosing methods,N_(2)O released mainly occurs in the first stage of each segmented influent,and the denitrification removal and N_(2)O release decreased with the increased of nitrite dosing times.