Mosquera-Corral A, de Kreuk M K, Heijnen J J, van Loosdrecht M C M
Department of Chemical Engineering, School of Engineering, Avda. Lope Gómez de Marzoa s/n. E-15782 Santiago de Compostela, Galicia, Spain.
Water Res. 2005 Jul;39(12):2676-86. doi: 10.1016/j.watres.2005.04.065.
In order to optimise nitrogen removal in an aerobic granular sludge system, short- and long-term effects of decreased oxygen concentrations on the reactor performance were studied. Operation at decreased oxygen concentration is required to obtain efficient N-removal and low aeration energy requirement. A short-term oxygen reduction (from 100% to 50%, 40%, 20% or 10% of the saturation concentration) did not influence the acetate uptake rate. A lower aerobic acetate uptake at lower oxygen concentrations was obviously compensated by anoxic acetate uptake. Nitrogen removal was favoured by decreased oxygen concentrations, reaching a value of 34% for the lowest oxygen concentration tested. Long-term effects were evaluated at two oxygen saturation levels (100% and 40%). Nitrogen removal increased from 8% to 45% when the oxygen saturation was reduced to 40%. However, the granules started to disintegrate and biomass washout occurred. It was impossible to obtain stable granular sludge at this decreased oxygen concentration under applied conditions. A solution to obtain stable aerobic granular sludge at low oxygen concentrations is needed in order to make aerobic granular sludge reactors feasible in practice.
为了优化好氧颗粒污泥系统中的氮去除效果，研究了降低氧浓度对反应器性能的短期和长期影响。为了实现高效的氮去除和较低的曝气能量需求，需要在降低的氧浓度下运行。短期的氧浓度降低（从饱和浓度的100%降至50%、40%、20%或10%）并未影响乙酸盐的摄取速率。较低氧浓度下较低的好氧乙酸盐摄取明显被缺氧乙酸盐摄取所补偿。降低氧浓度有利于氮去除，在所测试的最低氧浓度下达到了34%的值。在两个氧饱和度水平（100%和40%）下评估了长期影响。当氧饱和度降至40%时，氮去除率从8%提高到了45%。然而，颗粒开始解体并发生生物量流失。在应用条件下，在这种降低的氧浓度下无法获得稳定的颗粒污泥。为了使好氧颗粒污泥反应器在实际中可行，需要找到一种在低氧浓度下获得稳定好氧颗粒污泥的解决方案。
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