| 进水渗滤液总氮和BOD5/TN对填埋场反应器反硝化和厌氧氨氧化协同脱氮的影响 |
| 摘要点击 3052 全文点击 1381 投稿时间：2014-09-14 修订日期：2014-12-02 |
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| 中文关键词 填埋场生物反应器 晚期垃圾渗滤液 总氮负荷 BOD5/TN 脱氮 |
| 英文关键词 landfill bioreactor mature landfill leachate TN loading BOD5/TN nitrogen removal |
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| 中文摘要 |
| 晚期垃圾渗滤液具有氨氮浓度较高、碳氮比(C/N)较低和可生化性差的特点,生物脱氮较困难. 本文研究了改变进水总氮负荷和BOD5/TN比值对填埋场生物反应器处理垃圾渗滤液的脱氮效果的影响. 结果表明, 总氮负荷为15~25g ·(m3 ·d)-1的范围内时,总氮去除负荷稳定为10~12 g ·(m3 ·d)-1,但是总氮去除率随着负荷的增加从67.7%下降至60.2%,说明在一定范围总氮负荷的增加会降低总氮去除率,但不会影响去除负荷. 当改变进水的BOD5/TN从0.3提高到0.4后,总氮负荷为9g ·(m3 ·d)-1时的厌氧、准好氧反应器,总氮去除率可从79.9%分别提高到89.9%和86.2%,表明提高BOD5/TN能够有效促进填埋场生物反应器对总氮污染物的去除,并且厌氧条件下效果更好. 脱氮途径分析表明,填埋场生物反应器中厌氧氨氧化和反硝化作用可以协同脱氮. |
| 英文摘要 |
| Mature landfill leachate, featured with high ammonium (NH4+) content and low biodegrade ability (low BOD5/COD ratio), is hard to be treated. This study mainly focused on the effects of influent TN (total nitrogen) loading and BOD5/TN ratios on the nitrogen removal efficiency of landfill leachate by landfill bioreactors. The results showed that when the influent total nitrogen loading was in the range of 15 g ·(m3 ·d)-1 to 25 g ·(m3 ·d)-1, the TN removal loading could remain stable between 10g ·(m3 ·d)-1 and 12 g ·(m3 ·d)-1, while the TN removal efficiency decreased from 67.7% to 60.2% with the increasing loading. Therefore, TN loading shocks would lower the bioreactor's TN removal rate, but would not affect its TN removal loading. When the influent BOD5/TN ratio was increased from 0.3 to 0.4 and the TN loading was controlled at 9 g ·(m3 ·d)-1, the TN removal rates were increased from 79.9% to 89.9% and 86.2% in anaerobic and aerobic, respectively. This implied that properly enhancing BOD5/TN ratio could significantly increase the TN removal efficiency of the bioreactor, and the effect was more significant under anaerobic condition. Analysis of nitrogen removal pathways showed that denitrification and anammox could take place synergistically in landfill bioreactor. |
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