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Anoxic and aerobic values for the yield coefficient of the heterotrophic biomass: Determination at full-scale plants and consequences on simulations

机译：异养生物质产量系数的缺氧和好氧值：大规模植物的测定及其对模拟的影响

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The present study aims at optimizing the nitrification and denitrification phases at intermittently aerated process (activated sludge) removing nitrogen from municipal wastewater. The nitrogen removal performance recorded at 22 intermittently aerated plants was compared to the results obtained from the simulations given by the widely used ASM1. It is shown that simulations with a single value for the heterotrophic yield with any electron acceptor over-predict the nitrate concentration in the effluent of treatment plants. The reduction of this coefficient by 20% for anoxic conditions reduces the nitrate concentration by 10 g N·m-3. It significantly improves the accuracy of the predictions of nitrate concentrations in treated effluents compare to real data. Simulations with dual values (aerobic and anoxic conditions) for heterotrophic yield (modified ASM1) were then used to determine the practical daily aerobic time interval to meet a given nitrogen discharge objective. Finally, to support design decisions, the relevance of a pre-denitrification configuration in front of an intermittently aerated tank was studied. It is shown that when the load of BOD5 is below the conventional design value, a small contribution of the anoxic zone to nitrate removal occurs, except for over-aerated plants. When plants receive a higher load of BOD5, the modified ASM1 suggests that the anoxic zone has a higher contribution to nitrogen removal, for both correctly and over-aerated plants.
机译：本研究旨在优化间歇曝气过程（活性污泥）中从市政废水中去除氮的硝化和反硝化阶段。将在22个间歇充气植物中记录的脱氮性能与由广泛使用的ASM1给出的模拟结果进行了比较。结果表明，使用任何电子受体的异养产量的单一数值模拟会过度预测处理厂废水中的硝酸盐浓度。在缺氧条件下将该系数降低20％，可使硝酸盐浓度降低10 g N·m-3。与真实数据相比，它显着提高了处理废水中硝酸盐浓度的预测准确性。然后使用具有双值（需氧和缺氧条件）的异养产量（改良的ASM1）进行模拟，以确定满足给定氮排放目标的实际每日需氧时间间隔。最后，为了支持设计决策，研究了在间歇充气池前进行预脱硝配置的相关性。结果表明，当BOD5的负荷低于常规设计值时，除过度充气的植物外，缺氧区对硝酸盐去除的贡献很小。当植物受到较高的BOD5负荷时，修饰的ASM1表明，对于正确和过度充气的植物，缺氧区对脱氮的贡献更大。

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