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›› 2011, Vol. 11 ›› Issue (3): 401-404.

• 反应与分离 • 上一篇    下一篇

连续式泡沫分离法去除废水中铬(III)离子的动力学

李志洲   

  1. 陕西理工学院化学与环境科学学院化
  • 收稿日期:2010-12-14 修回日期:2011-04-27 出版日期:2011-06-20 发布日期:2011-06-20
  • 通讯作者: 李志洲

Kinetics of Chromium Ion Removal from Wastewater with Continuous Foam Separation

LI Zhi-zhou   

  1. School of chemiscal and environmental science of Shaanxi University of Technology
  • Received:2010-12-14 Revised:2011-04-27 Online:2011-06-20 Published:2011-06-20
  • Contact: LI Zhi-zhou

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被引次数

7

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450 mL/min，SDBS浓度60 mg/L，分离时间30 min，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.

关键词: 共沉淀泡沫分离, 铬离子, 脱除率, 停留时间分布

Abstract: Cr(VI) was separated from wastewater using the ferrous coprecipitation continuous foam separation method. The effects of pH value, molar ratio of Fe2+ 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 Fe2+ 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.

Key words: coprecipitation foam fractionation, chromium ion, removal rate, residence time distribution

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