曝气生物滤池处理含氰废水的启动性能及污染物去除特性

为了探讨曝气生物滤池（BAF）对氰化物的去除能力，采用两级曝气生物滤池对含氰废水进行了启动研究。结果表明，当BAF1和BAF2的HRT分别为7 h和5 h、进水温度为20～25 ℃、气水比为10∶1、进水COD为400 mg/L左右（葡萄糖配水）时，随着进水CN?的增加，两级BAF对CN?、COD和TN的去除率逐渐下降。当进水CN?从20.22 mg/L增加到65.23 mg/L时，两级BAF对CN?、COD和TN的去除率相应从92.1%、90.2%和61.7%降至59.1%、53%和25.4%。当初始CN?低于35.34 mg/L时，经过24 h闷曝后，BAF对CN?的去除率可达99%以上，出水CN?低于0.2 mg/L。初始CN?越高，BAF对CN?的降解速率越慢，完全降解CN?所需的时间 越长。

Start-up performance and characteristics of pollutant degradation in biological aerated filter for treating cyanide wastewater

To investigate the capacity of cyanide removal by biological aerated filter (BAF), two-stage BAF was used for treating cyanide wastewater in its start-up test. The results show that the removal rate of CN?、COD and TN in two-stage BAF decreased with the influent CN? increasing, under the condition of HRT of 7h in BAF1 and 5 h in BAF2, influent temperature of 20─25 ℃，air-water ratio of 10∶1, influent COD of 400mg/L (containing glucose). When influent CN? increased from 20.22 mg/L up to 65.23 mg/L, the removal rate of CN?、COD and TN were decreased from 92.1%、90.2% and 61.7% down to 59.1%、53% and 25.4%, respectively. BAF can get higher than 99% removal rate of CN? by 24 h reaction with initial CN? less than 35.34 mg/L. Degradation rate of cyanide in BAF decreased with higher initial cyanide concentration, and more time is needed in BAF to degrade cyanide completely.