硅藻土吸附水中Cr(Ⅵ)的试验

Chromic wastewater treatment by diatomaceous earth as absorbent

利用硅藻土作吸附剂研究处理含铬电镀废水,介绍含铬电镀废水处理的一些常用方法,硅藻土在处理废水方面的基本特征和应用前景。实验以含铬模拟废水代替电镀废水进行研究,通过Cr(Ⅵ)与显色剂的显色反应,利用分光光度法测定硅藻土处理前后模拟废水中Cr(Ⅵ)浓度的变化。通过试验找出了最佳吸附条件,确定了吸附剂的用量,分析了吸附反应时间和废水pH值对铬去除率的影响。结果表明,在pH值为1～2,处理时间为25min时,去除率可达70%以上。

This paper researched the progress of the chromic wastewater treatment processes by using the diatomaceous earth absorbent, and introduces some commonly used methods of chromic galvanization wastewater processing. It also described diatomaceous earth in processing wastewater aspect basic characteristic and application prospect. It researches the chromic simulation wastewater through reacting with the developer color; around use spectrophotometer method determination diatomaceous earth processing simulates in the wastewater Cr （Ⅵ） the density change. The experiment has discovered the best adsorption condition, the absorbent amount, the adsorption reaction time, and the wastewater pH value to the chromium removing rate influence. Results prove that best treatment effect, when the value of pH is 1 - 2, the time is 25 minutes, 70% Cr （ Ⅵ ） was removed for wastewater.