Effective partial nitrification to nitrite by down-flow hanging sponge reactor under limited oxygen condition
Effective partial nitrification to nitrite by down-flow hanging sponge reactor under limited oxygen condition
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DOI：
10.1016/j.watres.2006.10.019
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发表时间：
2007-01-01
期刊：
影响因子：
12.8
通讯作者：
Harada, Hideki
中科院分区：
文献类型：
--
作者：
Chuang, Hui-Ping;Ohashi, Akiyoshi;Harada, Hideki
短程硝化-厌氧氨氧化（ANAMMOX）工艺是一种具有吸引力的污水脱氮技术。在这项研究中，我们研究了部分硝化通过实施一个封闭的下降流悬挂海绵（DHS）反应器操作在控制氧气浓度。DHS工艺的基本概念类似于滴滤池，其中可以通过控制进入反应器的气流来容易地操纵氧浓度。向封闭反应器中加入含有NH 4Cl的人工废水，并在30 ℃下以1.5小时的HRT操作。将反应器内的氧气维持在低于3%（1.2mg DO . L-1）（DO-溶解氧），启动期间除外。5个月的连续运行表明，氧浓度和亚硝酸盐的产生有很强的关系。随着氧浓度的降低，亚硝酸盐相对于氧化铵的比例增加。在气相中氧限制在0.5%左右（0.2 mg DO L-1）下，部分硝化令人满意地完成。即使在有限的氧气浓度下，该系统也表现出高的铵去除率，最大为1.46kg NH 4 +-Nm（-3）天（-1）。我们还发现，氧气浓度在一氧化二氮的产生中起着重要的作用，随着氧气浓度的降低而增加。(c)2006爱思唯尔有限公司保留所有权利。
Combining the processes of partial nitrification and anaerobic ammonium oxidation (ANAMMOX) is an attractive wastewater-treatment technology for nitrogen removal. In this study we investigated partial nitrification by implementing a closed down-flow hanging sponge (DHS) reactor operated at controlled oxygen concentrations. Basic concept of DHS process is similar to that of trickling filter, in which oxygen concentration can be easily manipulated by controlling airflow to the reactor. The closed reactor was fed with artificial wastewater containing NH4Cl and operated with an HRT of 1.5 h at 30 degrees C. Oxygen inside the reactor was maintained below 3% (1.2 mg DO . L-1) (DO-dissolved oxygen) except during the startup periods. Five months of continuous operation showed that there was a strong relationship between oxygen concentration and nitrite production. The ratio of nitrite produced relative to ammonium oxidized increased by decreasing oxygen concentration. Partial nitrification was satisfactorily accomplished under oxygen limitation at around 0.5% in the gas phase (0.2 mg DO L-1). The system showed a high ammonium-removal rate, at a maximum of 1.46kg NH4+-Nm(-3)day(-1), even at limited oxygen concentration. We also found that oxygen concentration played an important role in the production of nitrous oxide, which increased with decreasing oxygen concentration. (c) 2006 Elsevier Ltd. All rights reserved.