【摘要】 本实验研究在序批式模式下高浓度硝酸盐的反硝化,比较用甲醇、醋酸钠和消化污泥上清液作碳源。实验发现,间歇曝气有助于提高反硝化污泥的沉降性能,而厌氧条件下,污泥的沉降性能差。污泥浓度4~5gVSS/L下,3种碳源都能有效地进行反硝化。最大硝酸盐去除率为0486gNO3N/gVSS·d。开始阶段,亚硝酸盐浓度增加,但用醋酸盐和硝化污泥上清液作碳源,其浓度最终下降为零。更多还原

【Abstract】 Denitrification under high nitrate concentration was studied in a fed batch mode. Methanol,sodium acetate and effluent from anaerobic (AD) were compared as the carbon sources.A batch aeration seems to promote the establishment of denitrifying bio flocks of good settling characteristics .The bio flocks produced in an anoxic reactor were of inferior settling characteristics.Bio flocks at concentrations of 4 to 5 g VSS/L denitrify efficiently on all three carbon sources tested.A maximum nitrate removal rate was found to be 0.486 g NO 3 N/(g VSS day).Nitrite accumulated iniatially,but its concentration decreased with time,and eventually reached zero when acetate or AD effluent were used as carbon source.更多还原