利用活性炭处理酸性矿井废水研究

STUDY ON THE TREATMENT OF ACID MINE WASTEWATER BY ACTIVATED CARBON

以酸性矿井废水为处理对象,研究了以活性炭作为反应介质的可渗透反应墙(PRB)对其pH的调节效果以及对其COD、SO42-、Cd2+、Cu2+及Zn2+的去除效果。结果表明,活性炭对酸性矿井废水有较好的处理效果,在反应8 h对COD、硫酸根的去除率最高分别可达46.7%、70%;对Cd2+、Cu2+、Zn2+的去除率最高分别可达90%、98.8%、90%,反应200 h对Cu2+的去除率仍有80%。同时对吸附饱和的活性炭进行酸再生,发现再生活性炭对酸性矿井废水也有较好的处理效果。

This paper studied the feasibility of treating the model acid mine wastewater by using a process of permeable reactive barrier （PRB）, in which activated carbon （AC） was used as the reaction medium. The adjustment ofpH and the removal of COD, sulfate and three kinds of heavy metal ions （Cd^2＋, Cu^2＋, Zn^2＋） were illustrated. The results showed that the AC was effective in treating acid mine wastewater, and the highest removal rates for COD and sulfate could be obtained in 8 h with 46.7% and 70%, respectively; the maximum removal efficiencies of Cd^2＋, Cu^2＋ and Zn^2＋ were 90%, 98.8% and 90%; the removal of Cu^2＋ was desirable 80% when the reaction time was 200 h. Besides, in this work： the regeneration of AC was conducted by using an acid regeneration method. In comparison to the original AC, the regenerated one presented not too bad and also displayed a good treatment effect toward the acid mine wastewater.