CONTROLLED REMOVAL OF IONS FROM AQUEOUS FLUID

Methods and systems for removal of ions from aqueous fluids are provided. In certain embodiments, the present disclosure provides a method of removing one or more oxyanions from an aqueous fluid, including the steps of contacting an aqueous fluid containing oxyanions with an aluminum metal whereby aluminum ions are released from the aluminum metal into the aqueous fluid, wherein the one or more oxyanions in the aqueous fluid react with the aluminum ions to form one or more ettringites; controlling a rate of release of the aluminum ions from the aluminum metal; and removing at least a portion of precipitated ettringites from the aqueous fluid. 提供了用于从水性流体中去除离子的方法和系统。在某些实施方式中，本公开提供了一种从水性流体中去除一种或多种氧阴离子的方法，所述方法包括以下步骤：使包含氧阴离子的水性流体与铝金属接触，由此铝离子从所述铝金属释放到所述水性流体中，其中所述水性流体中的一种或多种氧阴离子与所述铝离子反应以形成一种或多种钙矾石；控制所述铝离子从所述铝金属释放的速率；以及从所述水性流体中去除沉淀的钙矾石的至少一部分。