不同盐度对SBR工艺氨氮去除效果的影响

Effect of Different Salinity on the Removal Efficiency of Ammonia Nitrogen

采用序批式生物反应器(SBR)处理模拟含盐废水,利用醋酸钠作为碳源,当DO为0.3-0.5 mg/L、温度为35±1℃、pH为7.5-8.5时,考察NaCl和KCl两种盐度对SBR工艺氨氮去除效果的影响。结果表明,当SBR反应器中无盐度添加的废水时,通过30 d的驯化,活性污泥系统氨氮去除率稳定在90%以上;SBR反应器中添加NaCl和KCl含盐废水,当NaCl盐度增加至15 g/L时,出水氨氮高于10mg/L;当KCl盐度增加至20 g/L时,出水氨氮低于5 mg/L。当NaCl盐度为10 g/L时,SBR反应器达到90%以上的氨氮去除率所需的驯化时间为3 d,相同KCl盐度下SBR反应器达到90%以上的氨氮去除率需要2 d的驯化时间。

A continuous experiment was carried out using SBR process to treat the simulated wastewater. The effect of the NaCl and KCl on the denitrification efficiency was investigated at 0. 3-0.5mg/L of dissolved oxy- gen,35±1℃ ,7.5-8.5 of pH when sodium acetate was used as carbon source. The results show that removal efficiency of ammonia nitrogen is 90% when the activated sludge is domesticated for 30 d when SBR is used to treat the wastewater without salinity. When NaCl and KCl wastewater is added,effluent NH4^＋-N is higher than 10 mg/L and lower than 5 rag/L, respectively,when NaC1 and KC1 salinity are increased to 15 g/Land 20 g/L, respectively. In the same salinity, domestication time of activated sludge system is 3d in the 10 g/L of NaCl wastewater when the removal efficiency of ammonia nitrogen is higher than 90% ,however, 10 g/L KCl is 2 d to achieve the same removal efficiency of ammonia nitrogen.