Birnhack Liat, Nir Oded, Telzhenski Marina, Lahav Ori
a Faculty of Civil and Environmental Engineering , Technion - Israel Institute of Technology , Technion City , Haifa 32000 , Israel.
Environ Technol. 2015 Jul-Aug;36(13-16):1892-901. doi: 10.1080/09593330.2015.1015455. Epub 2015 Mar 9.
Deliberate struvite (MgNH4PO4) precipitation from wastewater streams has been the topic of extensive research in the last two decades and is expected to gather worldwide momentum in the near future as a P-reuse technique. A wide range of operational alternatives has been reported for struvite precipitation, including the application of various Mg(II) sources, two pH elevation techniques and several Mg:P ratios and pH values. The choice of each operational parameter within the struvite precipitation process affects process efficiency, the overall cost and also the choice of other operational parameters. Thus, a comprehensive simulation program that takes all these parameters into account is essential for process design. This paper introduces a systematic decision-supporting tool which accepts a wide range of possible operational parameters, including unconventional Mg(II) sources (i.e. seawater and seawater nanofiltration brines). The study is supplied with a free-of-charge computerized tool (http://tx.technion.ac.il/~agrengn/agr/Struvite_Program.zip) which links two computer platforms (Python and PHREEQC) for executing thermodynamic calculations according to predefined kinetic considerations. The model can be (inter alia) used for optimizing the struvite-fluidized bed reactor process operation with respect to P removal efficiency, struvite purity and economic feasibility of the chosen alternative. The paper describes the algorithm and its underlying assumptions, and shows results (i.e. effluent water quality, cost breakdown and P removal efficiency) of several case studies consisting of typical wastewaters treated at various operational conditions.
在过去二十年中，从废水流中有意沉淀鸟粪石（MgNH4PO4）一直是广泛研究的课题，并且作为一种磷再利用技术，预计在不久的将来会在全球范围内得到更多关注。对于鸟粪石沉淀，已经报道了多种操作方案，包括使用各种镁（II）源、两种提高pH值的技术以及几种镁磷比和pH值。鸟粪石沉淀过程中每个操作参数的选择都会影响工艺效率、总成本以及其他操作参数的选择。因此，一个综合考虑所有这些参数的模拟程序对于工艺设计至关重要。本文介绍了一种系统的决策支持工具，该工具接受广泛的可能操作参数，包括非常规的镁（II）源（即海水和海水纳滤盐水）。该研究提供了一个免费的计算机工具（http://tx.technion.ac.il/~agrengn/agr/Struvite_Program.zip），该工具连接两个计算机平台（Python和PHREEQC），以便根据预定义的动力学考虑进行热力学计算。该模型尤其可用于优化鸟粪石流化床反应器工艺操作，以提高磷去除效率、鸟粪石纯度以及所选方案的经济可行性。本文描述了算法及其基本假设，并展示了几个案例研究的结果（即出水水质、成本细目和磷去除效率），这些案例研究包括在各种操作条件下处理的典型废水。
