中文关键词Cu²⁺NO₂^-反硝化短期影响长期影响 英文关键词Cu²⁺NO₂^-denitrificationshort-term effectlong-term effect

作者	单位	E-mail
买文可	北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 北京市水质科学与水环境恢复工程重点实验室, 北京 100124	393315366@qq.com
彭永臻	北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 北京市水质科学与水环境恢复工程重点实验室, 北京 100124	pyz@bjut.edu.cn
吉建涛	北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 北京市水质科学与水环境恢复工程重点实验室, 北京 100124

中文摘要 短程生物脱氮工艺在废水处理中已经得到较为广泛的应用，其反硝化过程是实现氮去除的关键步骤，而关于废水中常见重金属离子Cu²⁺对以NO₂^-为电子受体反硝化过程的影响尚无系统研究.选取A/O反应器内具有良好短程生物脱氮特性的污泥，通过批次试验及SBR长期试验分别探究了Cu²⁺对以NO₂^-为电子受体反硝化过程的短期及长期影响.短期试验结果表明，Cu²⁺对以NO₂^-为电子受体反硝化过程具有明显抑制作用，对污泥反硝化活性的半抑制浓度EC₅₀为4.79mg·L^-1.在长期影响试验中逐渐提高污泥对Cu²⁺的耐受浓度，当Cu²⁺浓度为0.5 mg·L^-1和1 mg·L^-1时，污泥反硝化活性降低后均能够通过驯化恢复至原有水平；而Cu²⁺浓度升高至3 mg·L^-1后污泥反硝化性能遭到破坏且难以恢复，NO₂^--N去除率降低至10%以下，反硝化系统遭到严重抑制.但是，停止投加Cu²⁺后污泥反硝化活性在第14 d恢复至原有水平.同时，在Cu²⁺的长期影响过程中，EPS含量增多，对微生物抵御Cu²⁺的毒害起到重要保护作用，促使污泥粒径增大，污泥沉降性得到提高. 英文摘要 The short-cut biological nitrogen removal process has been widely used in industrial wastewater treatment, and denitrification is a crucial step for removing nitrogen on which the effect of Cu²⁺, a common heavy metal ion in wastewater, has not been studied. In this study, sludge with good short-range biological nitrogen removal characteristics in an A/O reactor was selected to investigate the short-term and long-term effects of Cu²⁺ on denitrification using NO₂^- as an electron acceptor. The results showed that Cu²⁺ had a significant inhibitory effect on denitrification process using NO₂^- as an electron acceptor, and the semi-inhibitory concentration EC₅₀ of sludge activity was 4.79 mg·L^-1. In the long-term experiment, the concentration of Cu²⁺ was gradually increased. When the concentration of Cu²⁺ was 0.5 mg·L^-1and 1 mg·L^-1, the denitrification activity of the sludge could be restored to the original level after acclimation. When the concentration of Cu²⁺ was increased to 3 mg·L^-1, the denitrification performance was destroyed and difficult to recover, at which point the NO₂^--N removal rate was reduced to less than 10% and the denitrification system was severely inhibited. However, there was some recovery of sludge denitrification capacity after the addition of Cu²⁺ had been stopped for 14 days. At the same time, during the long-term effect of Cu²⁺, the EPS content increased, which played an important role in protecting the microorganism against Cu²⁺ toxicity, and increased the sludge particle size and, as a result, sludge sedimentation.

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