Effects of aeration and internal recycle flow on nitrous oxide emissions from a Modified Ludzak Ettinger process fed with glycerol
Effects of aeration and internal recycle flow on nitrous oxide emissions from a Modified Ludzak Ettinger process fed with glycerol
复制标题
曝气和内部循环流对使用甘油的改良 Ludzak Ettinger 工艺中一氧化二氮排放的影响
DOI：
10.1007/s11356-015-5129-8
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发表时间：
2015
影响因子：
5.8
通讯作者：
Akihiko Terada
中科院分区：
文献类型：
--
作者：
Kang Song，Toshikazu Suenaga;Willie F. Harper Jr.;Tomoyuki Hori;Shohei Riya;Masaaki Hosomi;Akihiko Terada
一氧化二氮（N2 O）是从改良的Ludzak-Ettinger（MLE）工艺中排放出来的，作为一级活性污泥系统，需要缓解。以甘油为原料，研究了曝气速率和内循环流量（IRF）对MLE过程中N2 O排放的影响。将曝气量从1.5 L/min降低到0.5 L/min，好氧池中气态N2 O浓度和缺氧池中溶解N2 O浓度分别增加了54.4%和53.4%。在高通气期，N_2 O-N转化率为0.9%，潜在的N_2O还原菌主要是红细菌，占总菌数的21.8%。IRF比从3.6增加到7.2，好氧池的N2 O排放速率和缺氧池的溶解N2 O浓度分别下降了56%和48%。这项研究提出了有效的N2 O减排策略MLE系统。
Nitrous oxide (N2O) is emitted from a modified Ludzak–Ettinger (MLE) process, as a primary activated sludge system, which requires mitigation. The effects of aeration rates and internal recycle flow (IRF) ratios on N2O emission were investigated in an MLE process fed with glycerol. Reducing the aeration rate from 1.5 to 0.5 L/min increased gaseous the N2O concentration from the aerobic tank and the dissolved N2O concentration in the anoxic tank by 54.4 and 53.4 %, respectively. During the period of higher aeration, the N2O–N conversion ratio was 0.9 % and the potential N2O reducers were predominantlyRhodobacter, which accounted for 21.8 % of the total population. Increasing the IRF ratio from 3.6 to 7.2 decreased the N2O emission rate from the aerobic tank and the dissolved N2O concentration in the anoxic tank by 56 and 48 %, respectively. This study suggests effective N2O mitigation strategies for MLE systems.