Ca^(2+)、Mg^(2+)对SBR工艺脱氮效果的影响

Influence of Ca^(2+),Mg^(2+) on the effect of denitrification with SBR process

为有效治理工业废水,改善生态环境,笔者采用SBR工艺对含盐废水进行了长期连续实验研究,考察Ca2+、Mg2+对脱氮效果的影响。实验结果表明,在溶解氧为2~3 mg/L、pH为7~9、温度30℃条件下,当CaCl2浓度为0.10 mol/L时,氨氮去除率最高达到63%,亚硝态氮积累率为80.8%。当MgCl2浓度为0.2 mol/L时,氨氮去除率最高达到86%,亚硝态氮积累率高于90%。当CaCl2和MgCl2总浓度为0.10 mol/L,Ca2+/Mg2+分别为4∶1、1∶1和1∶4时,亚硝态氮积累率均高于96%;当Ca2+/Mg2+为4∶1时,氨氮去除率最高,达到80%。

In order to effectively control industrial wastewater and improve ecological environment, the author takes a long-term study on salinity wastewater with SBR process to investigate the influence of Ca^2＋ , Mg^2＋ on the effect of denitrification. The result shows that, dissolved oxygen - 2 - 3 mg/L, pH = 7 to 9, temperature = 30 ℃, when the concentration of CaCl2 is 0. 10 mol/L, the removal rate of ammonia nitrogen reaches 63% with the accumulation rate of nitrite nitrogen which is 80. 0% ;when the concentration of MgCl2 is 0. 2 mol/L, the removal rate of ammonia nitrogen reaches 86% with the accumulation rate of nitrite nitrogen which is over 90% ;when the concentration of CaCl2 and MgCl2 is 0. 10 mol/L, and Ca^2＋/Mg^2＋ is 4： l, 1：1 and 1：4, the accumulation rate of nitrite nitrogen which is over 96% ;when Ca^2＋/Mg^2＋ is 4：1 ,the removal rate of ammonia nitrogen is the highest,reaching 80%.