摘要
采用水合物生成装置分别加入二氧化碳和甲烷气体通过水合物法进行2组海水淡化实验。每组实验分别提取3次不同反应时间的水合物晶体,检测水合物中Na+、Mg2+、K+、Ca2+、B3+的离子浓度。结果表明:CH4水合物形成过程中,盐离子的脱盐效率与离子半径和所带电荷量呈线性相关性。CO2水合物生成实验中,由于Ca2+与CO2-3反应生成Ca CO3颗粒,故Ca2+离子浓度变化与离子半径和电荷量呈非线性关系。同时提出更全面的水合物法海水淡化中盐离子的排斥机制。较于反渗透传统方法,水合物法具有脱硼效果好的优势。
Using CO2 and CH4respectively to generate hydrate based on a special designed apparatus,the paper discussed the formation of hydrate in two experiments. Each experiment collected hydrate crystals at three different reaction periods. The ion concentration of Na+,Mg2 +,K+,Ca2 +,B3 +in the hydrate was dectected. The result showed that: Removal efficiency of each dissolved mineral strongly depends on the ionic size and charge during the hydrate process of CH4,showing a linear correlation. By the use of CO2 as the hydrate forming gas,the carbonate ions caused the precipitation of calcium ions in the form of Ca CO3. So the calcium ion( Ca2 +) did not show the linear correlation. The study illustrated a more comprehensive ion rejection mechanism of dissolved minerals by the process of gas hydrate. Compared with the traditional methods in reverse osmosis,hydrate method had good advantage of boron removal.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第5期10-13,47,共5页
Environmental Engineering
基金
国家自然科学基金(51176015)
关键词
水合物
海水淡化
脱盐效率
盐离子
hydrate
desalination
desalination efficiency
salt ions
