Abstract:Baesd on Donnan dialysis mechanism, copper ion separation and removing experiments in raw water using exchange membrane was conducted under voltage free condition. The copper ion removing effects of cation exchange membrane cuased by various potential pollutants in raw water such as inorganic particles, organic matters, EDTA acid, ammonia, ferric ion and surfacatant etc, were studied. The results showed that upon addition any one of the above pollutants to raw water, would influence on the copper ions removing effects more or less after a long time operation procedure. To pollutants with no physical and chemical interaction with copper ion and membrane, such as silica and non-ionic surfactant, there were little influences on the copper ion separation of the cation exchange membrane and the Cu2+ removal decreased only by about 4% compared to that of blank control experiments; Cu2+ could be precipitated by ammonia and anionic surfaceactive agent, or adsorbed by humic acid which made the concentration of free Cu2+ in the solution reduce by about 50%; While to pollutants which could form complex compounds with Cu2+, serious effects on Cu2+ removal efficiency were observed. For EDTA acid, ammonia and anionic surfaceactive agent, the Cu2+ removal effects decreased by approximately 100%, 78% and 56% respectively; Cationic surfactants may occupy a lot of space of film render Cu2+ remove difficulty; ferric ion easily hydrolyzed into iron hydroxide colloids in weak acid or neutral solution induced Cu2+ removal effect decreased to certain extend, by about 12% compared to the blank.
谢德华, 施周, 陈世洋. 水中污染物对阳离子交换膜分离去除Cu2+的影响[J]. 中国环境科学, 2012, 32(3): 440-446.
XIE De-Hua, SHI Zhou, CHEN Shi-Yang. Effect of water pollutants to copper ion removal by using cation exchange membrane.. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(3): 440-446.