凹凸棒/活性炭复合吸附质对模拟地下水中腐殖酸的吸附及再生研究

Study on Adsorbing Humic Acids in Ground Water by Attapulgite/active Carbon Composite and Its In-situ Regeneration

本文对凹凸棒石／活性炭复合吸附质（以下简称复合质）吸附处理水中腐殖酸的性能进行了研究，系统地研究了吸附时间、污染液浓度、pH值对其吸附行为产生的影响。并用柱实验模拟去除地下水中腐殖酸的过程，吸附饱和后对柱体进行通电再生，探讨材料的使用寿命。研究结果表明：复合质对腐殖酸的吸附速率先快速增大后趋于平缓，反应系统达到吸附平衡的时间约为100min；室温下复合质对腐殖酸的最大吸附量为13．89mg／g，吸附等温线方程符合Langmuir等温模型；吸附行为符合拟二级动力学方程；复合质在近中性较宽的pH值（3～10）范围内都有较好的吸附效果；复合质随再生次数的增加逐渐老化。本研究中的复合质对模拟地下水中腐殖酸的吸附模型可为去除地下水中的腐殖酸提供一定的理论依据。

Adsorption of humic acids （HA） onto attapulgite/active carbon composite （ATP-AC） was discussed under different time, different concentration and different pH conditions to investigate the removal efficiency of the HA by ATP-AC. Furthermore, column tests were set up to simulate the process of HA adsorption in ground water and the regeneration of ATP-AC was discussed. Experimental results showed that the removal efficiency increased rapidly in a short period of time, then increased slowly. The adsorption equilibrium reached after 100rain. Based on the Langmuir model analysis, the maximum adsorption capacity of HA on ATP-AC is 13.89 mg/g. The adsorption kinetics could be better described by the pseudo-second-model. In addition, the adsorption effect could be fine in a large pH range （3-10） and the removal efficiency of ATP-AC decreased after regeneration. The model of HA adsorption on ATP- AC could provide a theoretical basis for the removal of HA in the ground water.