摘要：

以内蒙古某煤化工企业反渗浓水为对象进行电渗析（ED）浓缩中试试验。试验结果表明，ED能对反渗透浓水溶解性总固体（TDS）实现高倍浓缩，浓缩倍数一般为7~8。而对有机物浓缩倍数不高，一般为TDS浓缩倍数的一半，同时也不浓缩硅，因此ED装置具有较强的抗污能力。研究发现，离子种类不同，对应的ED膜通量不同，Na+的离子通量最高，主要集中在6.0~7.2 mol/（m²·h），SO₄^2-的离子通量最低，主要集中在1.0~1.3 mol/（m²·h）；Cl-的离子通量为5.0 mol/（m²·h）左右，是SO₄^2-离子通量的3~5倍。另外，对ED关键设计参数进行了测试，其脱盐电耗为0.26~0.34 kW·h/kg，膜对盐迁移量为430~590 g/（m²·h）。

关键词: 煤化工, ED, 反渗透浓水

Abstract:

A pilot scale experiment about treating the concentrated solution of reverse osmosis by electrodialysis process was carried out in a coal chemical enterprise in Inner Mongolia. The experimental results showed that ED concentrated greatly TDS of the concentrated solution of reverse osmosis, and the concentration ratio of which was almost 7-8 times, while that of the organic matter was lower, generally half of that of TDS. On the contrast, the silicon couldn't be concentrated by the process, so the anti-pollution performance of ED device was great. It was found that the ED membrane flux was different with different ion species. And Na+ had the highest membrane ion flux in the range of 6.0-7.2 mol/(m²·h), while SO₄^2- had the lowest membrane ion flux in the range of 1.0-1.3 mol/(m²·h). And the membrane ion flux of Cl- is about 5.0 mol/(m²·h), which is 3-5 times of that of SO₄^2-. In addition, the key design parameters of electrodialysis process were tested. The ED desalination power consumption varied between 0.26 kW·h/kg and 0.34 kW·h/kg, and its salt transport quality ranged from 430 g/(m²·h) to 590 g/(m²·h).

Key words: coal chemical industry, electrodialysis, concentrated solution of reverse osmosis

中图分类号: 

• P747+.3