Abstract:

A sequencing batch reactor（SBR）was used to treat synthetic wastewater. Effects of organic carbons including sodium acetate，amylum and glucose on simultaneous nitrification and denitrification（SND）were investigated when pH，temperature，DO，MLSS and NH₄⁺-N were 7.0—8.0，30—32℃，0.5—1 mg/L，（4000±300）mg/L and 35—45 mg/L，respectively. Results indicated that removal efficiency of COD was 93.95%，and effluent NO₃^－-N was 7 mg/L when glucose was used as carbon source. Removal efficiency of COD was only 70% and effluent NO₃^－-N was 12 mg/L when amylum was used as carbon source. For sodium acetate，the COD removal efficiency was 88.34% and the effluent NO₃^－-N was 4 mg/L. When COD/NH₄⁺-N was 12 and sodium acetate was added intermittently，the removal efficiency of total nitrogen was higher than 90%，and simultaneous nitrification and denitrification were achieved. As a carbon source，sodium acetate was found more appropriate for SND in the SBR system than glucose and amylum.

摘要：

采用序批式生物反应器（SBR）处理模拟废水，在pH值7.0～8.0、温度30～32 ℃、DO浓度0.5～1 mg/L、MLSS (4000±300) mg/L、NH₄⁺-N 35～45 mg/L条件下，考察乙酸钠、淀粉和葡萄糖作为碳源对SBR工艺同步硝化反硝化效果的影响。结果表明：投加葡萄糖时，COD去除率达到93.95%，出水硝酸盐浓度为7 mg/L；投加淀粉时，COD去除率仅70%，出水硝酸盐浓度为12 mg/L；采用乙酸钠作为碳源时，COD去除率为88.34%，出水硝酸盐浓度为4 mg/L。COD/NH₄⁺-N为12，分次投加乙酸钠时，氨氮去除率高于95%，总氮去除率高于90%，实现了同步硝化反硝化。在同步硝化反硝化SBR系统中，乙酸钠比淀粉和葡萄糖更适合作为碳源。