铜、锌离子对厌氧氨氧化污泥脱氮效能的影响

Effect of Cu(Ⅱ) and Zn(Ⅱ) on nitrogen removal efficiency in anammox sludge

通过接种厌氧氨氧化污泥,研究了 Cu2＋、Zn2＋浓度变化对厌氧氨氧化污泥脱氮效能长短期的影响.短期实验结果表明,铜、锌离子对厌氧氨氧化污泥的脱氮效能影响主要分为3个阶段.刺激阶段,Cu2＋浓度0-1mg/L和Zn2＋浓度0-4mg/L时,随着进水金属离子浓度的增加,微生物活性受到刺激,氮去除速率迅速增加；稳定阶段,Cu2＋浓度1-8mg/L 时,氮去除速率处于稳定状态.抑制阶段,Cu2＋浓度大于8mg/L 和Zn2＋大于4mg/L时,随着进水金属离子浓度的增加,氮去除速率逐步下降.Cu2＋、Zn2＋对厌氧氨氧化污泥脱氮效能长期影响表明,当进水Cu2＋浓度达到4mg/L和Zn2＋达到8mg/L时厌氧氨氧化污泥的活性将受到抑制.降低进水重金属浓度后,厌氧氨氧化污泥活性可以得到恢复.厌氧氨氧化菌对Cu2＋的敏感性强于Zn2＋.

Theeffects of copper and zinc ion concentration on nitrogen removal efficiency were studied in short or long term by inoculating anammox sludge. The influence of copper and zinc ion in anammox sludge was mainly divided into three stages in the short-term. The stimulus phase, anammox bacteria activity was stimulated and the nitrogen removal rate increased rapidly with the increase of concentration of copper ion and zinc ion from 0mg/L to 1mg/L and from 0mg/L to 4mg/L respectively. The stabilization phase, the nitrogen removal rate in steady state with the concentration of copper ion increased from 1mg/L to 8mg/L. The Inhibition phase, the nitrogen removal rate decrease gradually with the increase of the concentration of copper ion or the zinc ion greater than 8mg/L and 4mg/L. Copper ions and zinc ions on anammox sludge nitrogen removal efficiency of long-term effects showed that, the nitrogen removal rate decrease rapidly and the sludge activity would be inhibited when the influent concentration of copper ion at 4mg/L and zinc ions to achieve 8mg/L. Anammox sludge activity can be recovery when reduce the influent concentration of heavy metals. Copper ion more susceptible than the zinc ion on anammox bacteria.