水处理系统中铁变化规律的初步研究

Preliminary Analysis on Iron's Changing Regularity in Water Processing Systems

采用微滤膜和超滤膜筛分方法,将水样分成三组。三组水样分别含"溶解态"铁、"溶解态+胶态"铁和"溶解态+胶态+悬浮态"铁。然后测定三组水样全铁,利用差减法计算溶解态、胶态、悬浮态各自的含量。沙角A厂水处理流程中铁的实测结果表明:悬浮态铁沿程下降最为明显,溶解态和胶态铁沿程几乎不变;水经过强酸氢离子交换器后悬浮态铁部分转化为溶解态铁;活性炭吸附过滤器、弱酸氢离子交换器、强酸氢离子交换器、弱碱氢氧离子交换器、强碱氢氧离子交换器、混合离子交换器都会截留悬浮态铁,因而都存在铁污染。

Using the microfiltration membrane and ultrafihration membrane screening methods, the water sample can be divided into three. These three samples include ＂ dissolved state＂ iron, ＂ dissolved and colloidal states＂ iron and ＂ dissolved, colloidal and suspended states＂ iron. Then measures the total iron quantity of these three water samples, using subtraction method to calculate content of dissolved state, colloidal state and suspended states respectively. From the measurements of iron during water processing at Shajiao A Power Plant, analysis shows that suspended state iron content dropped most rapidly, and dissolved state iron and colloidal state iron contents almost didn＇t change through the whole process. After the water ran through super-acid hydrogen ions exchanger, part of the suspended state iron changed into dissolved state iron. The suspended state iron can be intercepted by activated carbon absorption filter, weak-acid hydrogen ions exchanger, weak-alkaline hydrogen oxygen ions exchanger, strong-alkaline hydrogen oxygen ions exchanger, mixed ions exchanger; therefore all these units have iron pollutions.