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河流渗滤系统中BTEX的吸附行为实验模拟研究

Keywords: 河流渗滤系统,BTEX,吸附行为,实验模拟

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Abstract:

河流渗滤是一种自然净化过程,污染河水通过该过程在河流沉积层中发生物理、化学和生物作用,使得污染物浓度降低,入渗河水水质得到净化。为了研究BTEX污染河水通过河流渗滤系统时的吸附行为,进行了静态吸附模拟实验。结果表明BTEX4种组分在3种河流沉积物样品中的吸附平衡均可以在48h内完成。通过比较BTEX在3种不同河流沉积物样品中的吸附动力学曲线,可以发现BTEX在粉土中吸附速率最大,细砂中次之,粗砂中最小。BTEX在粉土和细砂中的吸附等温线符合Henry等温吸附方程,而在粗砂中符合Langmuir等温吸附方程。3种土壤中粉土和细砂具有较大的吸附容量,而粗砂吸附容量相对较小;粉土和细砂对苯的吸附能力最强,甲苯次之,乙苯和间二甲苯相对较小。从阻滞因子的计算结果来看,黄河花园口区采集的河流沉积物样品对BTEX各组分的迁移均具有较强的阻滞作用,在较高浓度范围内,河流渗滤系统能够通过吸附作用有效阻滞BTEX污染物,降低其对地下水的危害。

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