Characteristics of p-nitrophenol removal by SAT system with iron oxide coated sands

doi:10.11949/j.issn.0438-1157.20171620

Abstract

Abstract:

The more and more nitro aromatic compounds have been detected in the environment, and one of the most popular compounds was p-nitrophenol. To improve the removal effect of p-nitrophenol using soil aquifer system (SAT), the system was innovated with iron-oxide coated sand as the aquifer media. Characterization of the iron coated SAT shows that surface of the oxidized iron film was flocculent or lamellar without fixed shape. Ironoxide coated sand has pore structure and makes the specific surface increased 2 times to 4 times. Study of absorption kinetics indicated that the absorption kinetics were governed by the Freundlich model of chemical adsorption, and the absorption capacity was much enhanced. The diffusion model study demonstrated the pore diffusion was higher than sufficient diffusion. The results of the mini-column break through show that the adsorption is closely related to the residence time of the solute in the medium, so the flow rate should be appropriately controlled during the SAT operation.

Key words: SAT, pollution, regeneration, kinetics, diffusion model

摘要：

对硝基苯酚为硝基芳香族化合物中极具代表性的一种物质，且已在环境中大量检出。为了提高土壤地下渗滤系统对硝基苯酚的吸附性能，采用氧化铁覆膜的方法对含水层介质进行了改性。由性能测试结果可知，氧化铁砂的表面形态主要为无定形态的絮状体或孔隙，且其比表面积为原砂的2～4倍。通过改性前及改性后其静态吸附动力学及等温吸附模型研究结果可知，覆膜氧化铁砂的吸附行为主要为化学吸附，且改性后材质极易吸附对硝基苯酚。颗粒吸附扩散模型计算结果可知，氧化铁砂吸附对硝基苯酚的扩散形式是表面扩散以及孔隙扩散，并且孔隙扩散作用高于表面扩散作用。Mini柱实验表明，吸附作用与溶质在介质中的滞留时间密切相关，因此在SAT运行过程中应将流速控制在适当的范围。

关键词: 土壤含水层处理技术, 污染, 再生, 动力学, 扩散模型

CLC Number:

X523

WEN Yujuan, YANG Yuesuo, SONG Xiaoming, ZHANG Xi, LI Huizhong. Characteristics of p-nitrophenol removal by SAT system with iron oxide coated sands[J]. CIESC Journal, 2018, 69(7): 3059-3067.

温玉娟, 杨悦锁, 宋晓明, 张茜, 李惠中. 氧化铁砂SAT去除对硝基苯酚的吸附行为及性能研究[J]. 化工学报, 2018, 69(7): 3059-3067.

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