Abstract:

The exploratory research on the position setting of forward osmosis(FO) in the zero discharge of coal chemical industrial wastewater, the selective preference of draw solution, membrane fouling, etc. has been conducted. The results show that from the premise that no waste heat can be utilized, NaCl solution, as a kind of draw solution, has remarkable superiority, compared with NH₄HCO₃ and MgCl₂. When the FO is used for the concentration of biochemical influent, the presence of highly concentrated phenol can damage the osmosis membrane. Therefore, it is not suitable for the FO to be set at the front terminal of biological treatment. When the FO is used for the concentration of biochemical effluent, 2.5 mol/L of NaCl solution as draw solution is used. The system runs steadily and the water recovery rate is as high as 91.1%. The membrane fouling is mainly caused by organic matter, while the inorganic pollution is mainly ferric salts.

Key words: forward osmosis, coal chemical industrial wastewater, draw solution, membrane fouling

摘要：

对正渗透在煤化工废水零排放工艺中的布置位置、汲取液优选、膜污染等方面进行了研究。结果表明，在没有废热可利用的前提下，与NH₄HCO₃和MgCl₂相比，NaCl溶液作为汲取液具有明显的优势。利用正渗透浓缩生化进水时，高浓度酚的存在会损坏正渗透膜，因此，正渗透不宜设置在生化处理前端。利用正渗透浓缩生化出水时，2.5 mol/L NaCl溶液作为汲取液，系统运行平稳，最大水回收率高达91.1%；膜污染主要以有机污染为主，而无机污染则以铁盐污染为主。

关键词: 正渗透, 煤化工废水, 汲取液, 膜污染

CLC Number: 

• X703.1