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Effects of oxygen concentration on N-removal in an aerobic granular sludge reactor

机译：氧浓度对好氧颗粒污泥反应器脱氮的影响

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摘要

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.
机译：为了优化好氧颗粒污泥系统中的氮去除，研究了降低氧气浓度对反应器性能的短期和长期影响。需要在降低的氧气浓度下运行才能获得有效的脱氮和较低的充气能量需求。短期氧气减少（从饱和浓度的100％降低到50％，40％，20％或10％）不会影响乙酸盐的吸收速率。在较低的氧气浓度下，较低的需氧乙酸盐摄入量显然被缺氧的乙酸盐摄入量所补偿。降低氧气浓度有利于脱氮，测试的最低氧气浓度达到34％。在两个氧饱和度水平（100％和40％）下评估了长期影响。当氧饱和度降低到40％时，脱氮率从8％增加到45％。然而，颗粒开始崩解并发生生物质冲刷。在施加的条件下，在氧浓度降低的情况下不可能获得稳定的颗粒污泥。为了使好氧颗粒污泥反应器在实践中可行，需要一种在低氧浓度下获得稳定的好氧颗粒污泥的解决方案。

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