Effects of anaerobic HRT and VFA loading on the kinetics and stoichiometry of enhanced biological phosphorus removal
Effects of anaerobic HRT and VFA loading on the kinetics and stoichiometry of enhanced biological phosphorus removal
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DOI：
10.1002/wer.1544
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发表时间：
2021-02
影响因子：
3.1
通讯作者：
Erik R. Coats;Brent Deyo;Nicole Brower;C. Brinkman
中科院分区：
文献类型：
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作者：
Erik R. Coats;Brent Deyo;Nicole Brower;C. Brinkman
强化生物除磷（EBPR）可以回收大量的废水磷.然而，这种资源回收过程实现了有限的使用，主要是由于过程稳定性的考虑。本研究评估了厌氧HRT（τAN）和VFA浓度的影响，关键的操作参数，可以外部控制的EBPR性能。单独评价时，τAN（1-4 h）对出水磷无统计学影响。然而，PHA增加VFA负荷和生物量积累更多的磷。关于弹性，在增加VFA负荷下，PAO水解更多的磷以吸收/分解代谢VFA;此外，归一化为VFA负荷的PHA合成随着τAN增加而增加，表明发酵。在动力学上，PAO表现出qPHAAN和qVFAAN作为厌氧P释放的函数的Monod样关系;此外，qPAE表现出与末端厌氧PHA浓度的Monod样关系。最后的分析肯定了提高好氧磷吸收和净磷去除之间的关系，参数（磷去除倾向因子），结合进水VFA浓度和τAN。
Enhanced biological phosphorus removal (EBPR) can recover significant quantities of wastewater phosphorus. However, this resource recovery process realizes limited use largely due to process stability concerns. The research evaluated the effects of anaerobic HRT (τAN) and VFA concentration—critical operational parameters that can be externally controlled—on EBPR performance. Evaluated alone, τAN (1–4 h) exhibited no statistical effect on effluent phosphorus. However, PHA increased with VFA loading and biomass accumulated more phosphorus. Regarding resiliency, under increasing VFA loads PAOs hydrolyzed more phosphorus to uptake/catabolize VFAs; moreover, PHA synthesis normalized to VFA loading increased with τAN, suggesting fermentation. Kinetically, PAOs exhibited a Monod‐like relationships for qPHAAN and qVFAAN as a function of anaerobic P release; additionally, qPAE exhibited a Monod‐like relationship with end‐anaerobic PHA concentration. A culminating analysis affirmed the relationship between enhanced aerobic P uptake, and net P removal, with a parameter (phosphorus removal propensity factor) that combines influent VFA concentration with τAN.