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首页> 外文期刊>Bioprocess and Biosystems Engineering >Microbial population response to changes of the operating conditions in a dynamic nutrient-removal sequencing batch reactor
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Microbial population response to changes of the operating conditions in a dynamic nutrient-removal sequencing batch reactor

机译：动态脱氮定序分批反应器中微生物种群对运行条件变化的响应

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A nutrient-removal sequencing batch reactor operated with short anaerobic/aerobic cycles was subjected to different operating conditions, namely, cycle length, feeding pattern and feed composition. The changes in microbial population, as well as the contribution of microbial groups to the total nutrient removal, were estimated using the kinetic parameters obtained in this study. Denitrifying polyphosphate-accumulating organisms (DPAOs) were detected in the system, representing a fraction of 23% of phosphorus-accumulating organisms (PAOs). The results suggest that DPAOs and non-DPAOs are different microorganisms. The presence of nitrate in the feed stimulated DPAOs to predominate over non-DPAOs. Feeding the reactor with a mixture of organic substrates also stimulated DPAOs. Glycogen-accumulating organisms (GAOs) were likely to be present in the system and their development over PAOs was apparently favoured by increasing the aeration time and feeding during the aerobic phase. In contrast, the presence of propanoate in the feed apparently favoured PAOs over GAOs.
机译：在短的厌氧/好氧循环下运行的营养去除顺序分批反应器要经受不同的操作条件，即循环长度，进料方式和进料组成。使用本研究获得的动力学参数估算了微生物种群的变化以及微生物群对总养分去除的贡献。在系统中检测到了反硝化聚磷酸盐积累生物（DPAO），占磷积累生物（PAO）的23％。结果表明，DPAO和非DPAO是不同的微生物。饲料中硝酸盐的存在刺激了DPAO高于非DPAO。向反应器中加入有机底物的混合物也刺激了DPAO。糖原累积生物（GAOs）可能存在于系统中，并且通过增加曝气时间和好氧阶段的进食，它们在PAOs上的发展显然受到了青睐。相比之下，饲料中丙酸酯的存在显然较之于GAO更有利于PAO。

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