连续式泡沫分离法去除废水中铬(Ⅲ)离子的动力学  

Kinetics of Chromium Ion Removal from Wastewater with Continuous Foam Separation

作　　者：李志洲[1] 

机构地区：[1]陕西理工学院化学与环境科学学院,陕西汉中723000

出　　处：《过程工程学报》2011年第3期401-404,共4页The Chinese Journal of Process Engineering

基　　金：陕西省教育厅科研基金资助项目(编号:11JK0596)

摘　　要：采用铁盐共沉淀连续式泡沫分离法脱除废水中的铬(III)离子,实验考察了pH值、Fe2+/Cr(VI)摩尔比、十二烷基苯磺酸钠(SDBS)浓度、空气流量、分离时间等因素的影响.结果表明,最佳分离工艺条件为,Fe2+/Cr(VI)摩尔比5:1,pH值9.0,空气流量450mL/min,SDBS浓度60mg/L,分离时间30min,在此条件下铬离子脱除率为98.72%.根据泡沫分离与化学反应过程在物理行为上的类似性,引入等效的化学反应常数,宏观动力学研究结果表明,该泡沫分离过程可等效为一级反应,等效速率常数为0.541.Cr（VI） was separated from wastewater using the ferrous coprecipitation continuous foam separation method. The effects of pH value, molar ratio of Fe^2＋ to Cr（VI）, concentration of sodium dodecyl benzene solfonate （SDBS）, gas flow and separation time were studied. The results showed that under the optimal operating conditions of the molar ratio of Fe^2＋ to Cr（VI） 5：1, wastewater pH value 9.0, gas flow 450 mL/min, concentration of SDBS 60 mg/L, and separation time 30 min, Cr（VI） removal rate was 98.72%. According to the similar physical behavior of foam separation and chemical reaction processes, the equivalent chemical reaction constant was introduced, and the macroscopic kinetics of using coprecipitation foam to remove Cr（VI） from water was also studied. The result indicated that the coprecipitation foam separation process could be regarded as a first order reaction, and its equivalent rate constant was 0.541.

关 键 词：共沉淀泡沫分离 铬离子 脱除率 停留时间分布 

分 类 号：TS59[轻工技术与工程—皮革化学与工程]