| 短程硝化-反硝化生物滤池脱氮机制研究 |
| 摘要点击 2411 全文点击 1365 投稿时间：2011-12-01 修订日期：2012-03-11 |
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| 中文关键词 生物滤池 生物膜 生物脱氮 短程硝化 反硝化 |
| 英文关键词 biological filter biofilm biological nitrogen removal partial nitrification denitrification |
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| 中文摘要 |
| 研究了短程硝化生物滤池的调控因素以及短程硝化-反硝化生物滤池的脱氮机制. 结果表明,针对城市污水处理厂二级出水中的氨氮和总氮,在水温为(30±1)℃的条件下,提高进水pH值有助于硝化生物滤池中亚硝酸盐的积累,较好地实现短程硝化过程,当进水pH值平均为8.5时,亚硝酸盐的积累达到最大. 沿硝化生物滤池水流方向,pH和DO的变化呈相反趋势,亚硝酸盐的积累呈增加趋势,在反应器出水口较好地实现了亚硝酸盐的积累. 短程硝化-反硝化生物滤池对NH4+-N有较好的去除效率(90%以上); 当反硝化生物滤池进水COD/TN为3.0时,出水TN的浓度降低到8~9 mg·L-1的范围,去除率稳定在79%~81%. |
| 英文摘要 |
| The controlling factors for nitrite accumulation in partial nitrification and mechanism of nitrogen removal from the secondary effluent of wastewater treatment plant by partial nitrification-denitrification biological filter were investigated. The results showed that nitrite accumulated with increasing of pH value in the influent under the condition of temperature was (30±1)℃. The nitrite accumulation achieved to the highest at a pH value of 8.5 in this batch experiments. In addition, the nitrite accumulation presented increasing tendency through the up-flow nitrifying biological filter, which can be adjusted by the changes of pH and DO through the filter. The removal efficiency of NH4+-N was over 90% by the partial nitrification-denitrification biological filter. Meanwhile, carbon sources were supplied for the denitrifying bacteria to accomplish denitrification process. Under the condition of COD/TN at a value of 3.0, the concentration of TN in the effluent of denitrifying biofilter was 8-9 mg·L-1 and the removal efficiency achieved 79%-81%, stably. |
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