| 曝气生物滤池中的亚硝酸盐积累及其影响因子 |
| 摘要点击 2480 全文点击 4233 投稿时间：2002-02-02 修订日期：2002-04-01 |
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| 中文关键词 曝气生物滤池 脱氮 亚硝酸盐积累 短程硝化反硝化 反冲洗 |
| 英文关键词 biological aerobic filter (BAF) nitrogen removal accumulation of nitrite shortcut nitrification-denitrification backwash |
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| 中文摘要 |
| 通过模型试验研究了曝气生物滤池脱氮过程中的亚硝酸盐积累现象,考察了运行条件对亚硝酸盐积累的影响.试验结果表明,曝气生物滤池在滤速1～2m/h、气水比3:1、水温20.5℃～26.5℃、进水氨氮负荷0.26～0.62kg/(m3·d)、总氮负荷0.28～0.63kg/(m33·d)和0.18～0.42kg/(m3·d)反应器内反应液和处理水连续监测结果、反应器内含氮化合物空间分布分析以及微生物数量及活性测定结果表明,反应器中出现了明显的亚硝酸盐积累现象,表现出显著的短程硝化反硝化特征.初步分析探讨了亚硝酸盐积累的形成机理和运行条件对亚硝酸盐积累的影响,认为反冲洗过程是最主要的影响因素,而曝气生物滤池的结构特征和运行方式是其能够出现亚硝酸盐积累,并进行短程硝化反硝化脱氮的主要原因. |
| 英文摘要 |
| The nitrite accumulation in a bench-scale biological aerobic filter (BAF) for nitrogen removal was reported in this paper. The influences of operational variables on filter performance and nitrite accumulation were also investigated. The influent loading of NH4+-N and TN were 0.26～0.62 kg /(m3·d) and 0.28～0.63kg/(m3·d) respectively, the hydraulic loading, gas/water ratio and temperature were 1～2m/h, 3∶1 and 20.5℃～26.5℃ respectively, the nitrogen removal loading of NH4+-N, TN were among 0.15～0.52 kg/(m33·d) respectively. The nitrite concentrations in the bulk and effluent, the profiles of inorganic nitrogen-compounds, the microbial populations in the reactor and their activity were investigated, suggesting that the nitrite accumulation and shortcut nitrification-denitrification took place in the bioreactor. The mechanism of nitrite accumulation and the influences of operational variables were analyzed. The backwash process was considered as the key influential factor of nitrite accumulation. It was believed that the structure feature and operational pattern were the principal factors that may result in the nitrite accumulation and shortcut nitrification-denitrification occurring in the BAF reactor. |
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