蚀刻液废水厌氧氨氧化脱氮性能研究

采用上流式生物膜反应器接种厌氧氨氧化污泥,研究了印制电路板行业蚀刻液废水厌氧氨氧化脱氮可行性.结果表明,蚀刻液废水作为NH4+-N源时,其所携带的物质对厌氧氨氧化污泥活性具有毒性作用.当蚀刻液废水稀释到NH4+-N浓度150mg/L进入反应器14d后,厌氧氨氧化氮去除速率从3.2kg/(m3·d)下降到1.2kg/(m3·d).但是通过驯化培养可以很好地缓解蚀刻液对厌氧氨氧化污泥的毒性影响.经过110d的驯化,蚀刻液废水稀释到NH4+-N浓度300mg/L进入反应器后并未出现明显的抑制现象.厌氧氨氧化氮去除速率从1.6kg/(m3·d)上升到6.0kg/(m3·d).说明通过驯化培养后,厌氧氨氧化工艺能够很好的运用到PCB行业高NH4+-N废水的处理.

Study on nitrogen removal performance of ANAMMOX process of etching wastewater

The performance of anaerobic ammonia oxidation (ANAMMOX) for nitrogen removal from etching wastewater was investigated using an up flow biofilm reactor by inoculating with ANAMMOX sludge．The reactor operation results indicate that etching wastewater was toxic to activity of ANAMMOX sludge as NH4+-N source. Nitrogen removal rate of ANAMMOX reactor was reduced from 3.2 kg/(m3·d) to 1.2 kg/(m3·d) in 14 days, when the concentration of NH4+-N in the influent was 150 mg/L by diluting the etching wastewater. However, the effect of etching wastewater on ANAMMOX sludge was relieved marked by domestication. After 110d domestication, obvious inhibition phenomenon was not observed when the concentration of NH4+-N in the influent was 300 mg/L by diluting etching wastewater. At the same time, nitrogen removal rate of ANAMMOX reactor increased from 1.6 kg/(m3·d) to 6.0 kg/(m3·d). It was suggested that ANAMMOX process could be well applied to printed circuit board industry wastewater treatment with high concentration of NH4+-N through domestication of ANAMMOX sludge.