Abstract Freshwater scarcity has been troubling the high-quality development of many countries and regions, and seawater desalination is a vital source of freshwater. Recently, gas hydrate based desalination (GHBD) technology attracts much attention because of bringing no extra pollution to water. We developed a novel multifunctional desalination apparatus via gas hydrate with various operation modes and separation methods. In this study, the desalination characters under different separation modes were conducted using simulated seawater, and the hydrate-purging method with a desalination efficiency of more than 80% was selected to desalt the natural seawater sample. In addition, the purging method can greatly improve the desalination effects of both squeezed hydrate column and loose hydrates. The experimental results indicate that the removal efficiencies of different ions in the seawater were similar and their difference was related to the strength of ionic hydration. And above all, we designed and conducted a continuous desalination process including multiple injection, separation, washing and purging operations. The ultimate desalination efficiency using hydrate-purging method was over 80%, and the freshwater recovery was above 30% with 200 mL initial seawater in this study. The experimental proposal and results of this study are of great significance to the development of GHBD technology.

中文翻译：

---

新型天然气水合物脱盐系统实验研究

摘要 淡水稀缺一直困扰着许多国家和地区的高质量发展，海水淡化是淡水的重要来源。近年来，基于天然气水合物的海水淡化（GHBD）技术由于不会对水造成额外污染而备受关注。我们开发了一种新型的多功能气体水合物脱盐装置，具有多种操作模式和分离方法。本研究利用模拟海水对不同分离模式下的脱盐特性进行了研究，选择了脱盐效率大于80%的水合物净化方法对天然海水样品进行脱盐。此外，吹扫法可以大大提高挤压水合物柱和松散水合物的脱盐效果。实验结果表明，海水中不同离子的去除效率相似，其差异与离子水化强度有关。最重要的是，我们设计并实施了一个连续的脱盐工艺，包括多次注入、分离、洗涤和吹扫操作。使用水合物净化法的最终脱盐效率超过80%，本研究中200 mL初始海水的淡水回收率超过30%。本研究的实验方案和结果对GHBD技术的发展具有重要意义。清洗和吹扫操作。使用水合物净化法的最终脱盐效率超过80%，本研究中200 mL初始海水的淡水回收率超过30%。本研究的实验方案和结果对GHBD技术的发展具有重要意义。清洗和吹扫操作。使用水合物净化法的最终脱盐效率超过80%，本研究中200 mL初始海水的淡水回收率超过30%。本研究的实验方案和结果对GHBD技术的发展具有重要意义。