| 生物膜CANON反应器性能的优化:从FBBR到MBBR |
| 摘要点击 2331 全文点击 750 投稿时间：2017-10-11 修订日期：2017-11-12 |
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| 中文关键词 移动床生物膜反应器 固定床生物膜反应器 全程自养脱氮工艺 高氨氮 污水处理 改性聚乙烯 |
| 英文关键词 moving-bed biofilm reactor (MBBR) fixed-bed biofilm reactor (FBBR) CANON process high-ammonia wastewater treatment modified polyethylene |
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| 中文摘要 |
| 控制温度为30℃±1℃，在移动床式生物膜反应器（MBBR）采用以改性聚乙烯为填料的全程自养脱氮（CANON）工艺，以无机高NH4+-N（约400 mg·L-1）人工模拟废水为连续进水，研究MBBR对生物膜CANON工艺脱氮性能的优化.试验控制pH在7.8左右，HRT为6 h，填料填充率为35%，经过一个月调试与培养，NH4+-N及TN平均去除率达到74.28%和87.93%，最高分别可达84.68%和98.82%，此时ΔNO3-/ΔTN为0.12，接近理论值0.127，由此判断CANON污泥在MBBR工艺中逐渐适应并得以稳定运行.同时，对比采用相同进水基质及控制条件的固定床式生物膜反应器（FBBR），计算发现MBBR与FBBR工艺NH4+-N去除率、TN去除率及去除负荷3组均方差分别为：8.31%和14.06%，7.09%和11.79%，0.17 kg·（m3·d）-1和0.27 kg·（m3·d）-1，前者均低于后者；并且，在MBBR与FBBR的DO平均浓度分别为1.96 mg·L-1和3.09 mg·L-1的情况下，MBBR与FBBR中每升氮去除负荷分别为0.53 kg·（m3·d）-1和0.37 kg·（m3·d）-1.因此，①相比FBBR，MBBR具有更加稳定的脱氮性能；②相比FBBR，MBBR中每升填料中的微生物具有更高的O2利用效率及总氮去除负荷. |
| 英文摘要 |
| To optimize the performance of completely autotrophic nitrogen removal over nitrite (CANON), a CANON process with modified polyethylene as carriers was operated in a moving-bed biofilm reactor (MBBR), using synthetic inorganic ammonia-rich wastewater (NH4+-N about 400 mg ·L-1) as influent at 30℃±1℃. With an HRT of 6 h, pH at 7.8, and filling rate of 35%, the average removal rate of NH4+-N and TN reached 74.28% and 87.93%, respectively, and the highest removals reached 84.68% and 98.82%, respectively, while the value of ΔNO3-/ΔTN was 0.12, which was close to the theoretical value of 0.127. This suggested that CANON sludge gradually adapted to the environment in the MBBR and began to enter the stable stage. Compared with a fixed-bed biofilm reactor (FBBR) under the same influent and operating conditions, the mean square error of MBBR and FBBR in terms of NH4+-N removal rate, TN removal rate, and TN removal load were 8.31% and 14.06%, 7.09% and 1.79%, 0.17 kg ·(m3 ·d)-1 and 0.27 kg ·(m3 ·d)-1, respectively, the former are lower than the latter. Moreover, while DO concentrations of MBBR and FBBR were 1.96 mg·L-1 and 3.09 mg ·L-1, respectively, their TN removals of per liter carriers were 0.53 kg ·(m3 ·d)-1 and 0.37 kg ·(m3 ·d)-1. Therefore, it was concluded that:① MBBR had a more stable nitrogen removal performance than did of FBBR, and ② MBBR had a higher TN removals of per liter carriers than did FBBR in addition to the higher utilization rate of oxygen. |
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