活性炭湿式氧化再生效率评价方法

以苯酚为吸附质 ,重点研究活性炭在湿式氧化再生前后的碘值、焦糖值、穿透曲线、吸附等温线及标准吸附等温线法等几种再生效率评价方法的差异及其适用性 .通过对实验结果分析与比较 ,认为碘值、焦糖值和穿透曲线法不适宜评价活性炭WAO再生效率 ;而吸附等温线试验法虽能客观反映WAO中活性炭的再生效率 ,但其实验工作量太大不便使用 .研究结果还表明 :标准再吸附实验法是一种适合于活性炭湿式氧化再生的相对简便、灵敏、准确的再生效率的评价方法 .在WAO的主要参数即压力、温度和时间分别控制在 0.6MPa、250℃和 1h时 ,活性炭再生效率达到55% .

Evaluation for the Regeneration Efficiency of Activated Carbon by Wet Air Oxidation

It is well known that different regenerating techniques of activated carbon(AC) require the suitable evaluating methods for regeneration efficiency. In this paper, several methods for evaluating the regeneration efficiency of AC were compared and discussed by wet air oxidation(WAO) which were respectively based on different experimental protocols such as iodine value, molasses color adsorption, breckthrough profile, adsorption isotherm and standard reload experiment. The iodine value, molasses color adsorption and breckthrough profile yielded indefinitely PR values for WAO process, so they could not be applied to evaluate regeneration efficiency. And adsorption isotherm experiment was more correct because it compared isotherm loadings at the same equilibrium liquid phase concentrations, but this more laborious and time-consuming method was difficult to be widely used. The results also showed that the standard reload experiment was consequently picked out, easy to use and had high sensibility alternative to adsorption isotherm experiment. When controlling the WAO parameters at 250 degrees C, 0.6 MPa and 1 h, the regeneration efficiency arrived to 55%.