Modeling the Plantwide Implications of Struvite Loss from Sidestream Precipitation Reactors
Modeling the Plantwide Implications of Struvite Loss from Sidestream Precipitation Reactors
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DOI：
10.1021/acsestengg.1c00404
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Samuel E. Aguiar;Manying Zhang;Adrian Romero-Flores;Tom Johnson;R. Cusick
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作者：
Samuel E. Aguiar;Manying Zhang;Adrian Romero-Flores;Tom Johnson;R. Cusick
强化生物除磷（EBPR）与侧流鸟粪石沉淀相结合是一种协同除磷和回收磷的处理方法。然而，在结晶反应器中的周期性中断事件可能会导致精细鸟粪石颗粒冲刷，然后P溶解，导致EBPR出水质量下降，但建模工具不存在量化鸟粪石损失的全工厂影响。为了了解鸟粪石损失和溶解对EBPR的影响，这项工作首先量化的溶解速率的现场收获鸟粪石使用表面积依赖的收缩对象模型，并提出了一种新的粒子群体平衡溶解建模工具，与全工厂过程模拟器（SUMO）集成。从溶解实验的时间序列P浓度数据的分析产生的速率常数为1.14 mm min-1。植物内磷动力学的模拟表明，当鸟粪石反应器操作具有高的捕获效率，大部分流入的正磷酸盐可以通过侧流沉淀被捕获。在鸟粪石损失的情况下，大颗粒不会完全溶解，并且在初级澄清期间通过沉淀去除，而不会显著破坏EBPR。相比之下，200 μ m大小的鸟粪石颗粒的损失可导致高达0.8 mg P/L的出水磷酸盐差异。我们的研究结果表明，表面积依赖的模型是必不可少的量化鸟粪石损失的影响，反应器的设计应集中在颗粒保留，而不是可溶性磷鸟粪石的转换。
The combination of enhanced biological phosphorus removal (EBPR) with sidestream struvite precipitation is a synergistic treatment approach for P removal and recovery. However, periodic disruption events in crystallization reactors can cause fine struvite particle washout followed by P solubilization, leading to decreases in EBPR effluent quality, yet modeling tools do not exist to quantify plantwide impacts of struvite loss. To understand the impacts of struvite loss and dissolution on EBPR, this work first quantifies the dissolution rate of field-harvested struvite using the surface area-dependent shrinking object model and presents a novel particle population balance dissolution modeling tool for integration with a plantwide process simulator (SUMO). Analysis of time series P concentration data from dissolution experiments yields a rate constant of 1.14 mm min–1. Simulations of intra-plant phosphorus dynamics indicate that when struvite reactors operate with a high capture efficiency, the majority of influent orthophosphate can be captured through sidestream precipitation. In the event of struvite loss, large particles would not fully dissolve and are removed through sedimentation during primary clarification without significant disruption of EBPR. In contrast, the loss of 200 μm-sized struvite particles can lead to a difference in effluent phosphate of up to 0.8 mg P/L. Our results suggest that surface area-dependent models are essential to quantify the impacts of struvite loss and that reactor design should center on particle retention, rather than conversion of soluble P to struvite.