College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou 310036, China.
College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou 310036, China.
Bioresour Technol. 2016 Jan;200:208-16. doi: 10.1016/j.biortech.2015.10.035. Epub 2015 Oct 19.
This study evaluated the interactive effect of Cu(II) and Zn(II) on anaerobic ammonium oxidation (anammox) activity using response surface methodology with a central composite design. A regression model equation was developed and validated to predict the normalized anammox activity (NAA) of anammox granules exposed to various heavy metal concentrations. The joint inhibitory effect tended to exacerbate initially and reversed as the concentrations increased and then moderated again. The most severe inhibition, resulting in a NAA of 20.1%, occurred at Cu(II) and Zn(II) concentrations of 16.3 and 20.0mgL(-1), respectively. Notably, the cumulative toxicity was mitigated with the aid of intermittent exposure acclimatization. Additionally, pre-exposure to Cu(II) in the absence of substrates strongly inhibited anammox activity. However, the presence of NO2(-) significantly enhanced Cu(II) inhibition. Therefore, such conditions should be avoided to minimize the disturbance of the anammox process.
本研究采用中心复合设计的响应面法评估了 Cu(II) 和 Zn(II) 对厌氧氨氧化（anammox）活性的交互影响。建立并验证了一个回归模型方程，用于预测暴露于不同重金属浓度下的厌氧氨氧化颗粒的归一化厌氧氨氧化活性（NAA）。随着浓度的增加，联合抑制作用最初加剧，然后逆转，然后再次缓和。在 Cu(II) 和 Zn(II) 浓度分别为 16.3 和 20.0mgL(-1)时，抑制作用最为严重，导致 NAA 为 20.1%。值得注意的是，间歇暴露驯化有助于减轻累积毒性。此外，在没有基质的情况下预先暴露于 Cu(II)会强烈抑制厌氧氨氧化活性。然而，NO2(-) 的存在显著增强了 Cu(II) 的抑制作用。因此，应避免这种条件，以最大程度地减少对厌氧氨氧化过程的干扰。
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