鸟粪石沉淀法回收废水中磷的工艺建模与优化

K. Fattah, D. Mavinic
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引用次数: 0

摘要

鸟粪石沉淀途径回收废水中的磷可为磷提供一个可行的、可持续的来源。这条途径很重要,因为目前的磷矿储量预计将在未来几十年内耗尽,或者从矿石中回收将变得更加昂贵。然而,从废水中回收磷并不是简单的,因为磷以鸟粪石的形式沉淀的变量和化学成分的数量引起了复杂性。对结晶现象的动态性质进行建模似乎是控制这一过程的首选方法。建立了鸟粪石结晶法回收磷过程的动态控制模型。该模型结合了化学和控制软件,并用于提高中试规模流化结晶器的效率和流程操作的便利性。该过程模型是自动控制器的基础,该控制器具有操纵流量和化学添加剂的能力,从而将系统控制在所需的设定点。然后将控制模型用作预测工具,以确定影响过程的过饱和比(主要控制参数)的条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling and optimization of struvite precipitation process for phosphorus recovery from wastewater
The recovery of phosphorus from wastewater following struvite precipitation pathway can provide a viable and sustainable source for phosphorus. This pathway is important because current phosphorus ore reserves are expected to be exhausted within the next few decades, or, the recovery from the ores will become more costly. However, the recovery of phosphorus from wastewater is not straightforward due to the complexities arising from the number of variables and chemistry involved with the precipitation of phosphorus as struvite. Modeling the dynamic nature of the crystallization phenomenon appears to be the method of choice to control the process. In this study, a dynamic control model for phosphorus recovery process via struvite crystallization was developed. This model incorporated both chemistry and control software, and was used to increase the efficiency and ease of process operation of a pilot-scale fluidized crystallizer. This process model was the basis of an automatic controller that had the capability to manipulate flows and chemical additions, and thereby control the system at a desired set point. The control model was then used as a prediction tool to determine conditions that influence the supersaturation ratio — the primary control parameter — of the process.
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