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Forward Osmosis for Ion Exchange Waste Brine Management
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-01-22 , DOI: 10.1021/acs.estlett.9b00733 Miguel S. Arias-Paić 1 , Julie A. Korak 2
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-01-22 , DOI: 10.1021/acs.estlett.9b00733 Miguel S. Arias-Paić 1 , Julie A. Korak 2
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For many water systems, ion exchange is the best available technology to meet nitrate, chromium, arsenic, and other inorganic removal requirements. The principal economic, environmental, and operational considerations relate to waste disposal. The salt saturator at ion exchange (IX) installations provides an untapped chemical energy source to reduce the IX waste brine volume that can be leveraged by integrating forward osmosis (FO) between the saturator and waste brine tank. The waste brine (FO feed solution) is concentrated by the salt saturator solution (FO draw solution) as water permeates across the FO membrane from the waste to the saturator. This study demonstrates waste reductions of 85% for chromium and 65% for nitrate IX waste brines. The augmented draw solution produced can be directly used in a subsequent IX regeneration, and waste solids can be recovered through precipitation. Due to the periodic generation of IX waste, high fluxes and single-pass efficiency are not required from the FO process. With the incorporation of FO into the IX process, significant operational flexibility to optimize the recovery of water from the waste brine exists, thereby decreasing the primary cost of IX operation.
中文翻译：
正向渗透用于离子交换废物盐水管理
对于许多水系统而言，离子交换是满足硝酸盐，铬，砷和其他无机去除要求的最佳可用技术。主要的经济，环境和运营考虑与废物处理有关。离子交换（IX）设施中的盐饱和器提供了未开发的化学能源，可减少IX废盐水的体积，通过在饱和器和废盐水箱之间集成正向渗透（FO）可以利用该盐饱和器。当水从废物到饱和器穿过FO膜渗透时，废盐水（FO进料溶液）被盐饱和器溶液（FO抽出溶液）浓缩。这项研究表明，铬的废料减少了85％，硝酸盐IX废盐水减少了65％。产生的增强抽提溶液可直接用于后续的IX再生中，废物可以通过沉淀回收。由于IX废物的周期性产生，因此FO工艺不需要高通量和单程通过效率。随着将FO掺入IX工艺中，存在显着的操作灵活性以优化从废盐水中回收水，从而降低了IX操作的主要成本。
更新日期：2020-01-23
中文翻译：
正向渗透用于离子交换废物盐水管理
对于许多水系统而言，离子交换是满足硝酸盐，铬，砷和其他无机去除要求的最佳可用技术。主要的经济，环境和运营考虑与废物处理有关。离子交换（IX）设施中的盐饱和器提供了未开发的化学能源，可减少IX废盐水的体积，通过在饱和器和废盐水箱之间集成正向渗透（FO）可以利用该盐饱和器。当水从废物到饱和器穿过FO膜渗透时，废盐水（FO进料溶液）被盐饱和器溶液（FO抽出溶液）浓缩。这项研究表明，铬的废料减少了85％，硝酸盐IX废盐水减少了65％。产生的增强抽提溶液可直接用于后续的IX再生中，废物可以通过沉淀回收。由于IX废物的周期性产生，因此FO工艺不需要高通量和单程通过效率。随着将FO掺入IX工艺中，存在显着的操作灵活性以优化从废盐水中回收水，从而降低了IX操作的主要成本。
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